RÉSUMÉ
Objective To clarify the expression and distribution of brain⁃derived neurotrophic factor (BDNF) in the cerebrum of plateau yaks and cattle, and to explore the relationship between BDNF function and the adaptability of altitude hypoxia. Methods Five yaks and five cattles were selected.The content and distribution of BDNF in frontal lobe, temporal lobe, parietal lobe, occipital lobe, cerebrum white matter and hippocampus of yak and cattle were analyzed by Real⁃time PCR, Western blotting and Immunohistochemistry. Results Real⁃time PCR result showed that BDNF mRNA expression in the cerebrum of yaks and cattles was highest in temporal cortex, followed by hippocampus, parietal cortex, occipital cortex and frontal cortex, and lowest in white matter. Western blotting results showed that the content of BDNF protein in the cerebrum of yaks was the highest in temporal cortex,followed by hippocampus. The content of BDNF protein in other tissues was parietal cortex, frontal cortex and cerebrum white matter, and the content of BDNF protein was the lowest in occipital cortex. The content of BDNF protein intlecerebrum of cattles was the highest in the temporal cortex, followed by the hippocampus. The content of BDNF protein in other tissues was parietal cortex, occipital cortex and frontal cortex in descending order, and the protein content in cerebrum white matter was the lowest. Immunohistochemical results showed that the positive expression of BDNF protein in the cerebrum of yaks and cattles was basically similar, mainly distributed in the granulosa cells and glial cells in the frontal cortex, temporal cortex, parietal cortex and occipital cortex, glial cells in cerebrum white matter, pyramidal cell layer and polyform cell layer in the hippocampus. There was the small amount of distribution in Martinotti cells and the molecular layer of hippocampus in the cerebral cortex. Conclusion BDNF mRNA and protein are distributed and expressed in different brain regions of yaks and cattles, but the expression level different, which is speculated to be closely related to the specific functions of different cerebrum regions. The expression level of the cerebrum of yak is higher than that of cattle except occipital cortex, suggesting that it is related to the altitude hypoxic environment. BDNF may play an important role in enhancing hypoxic tolerance and protecting internal environmental homeostasis in the process of animal adaptation to hypoxic environment.
RÉSUMÉ
Objective To explore the expression and distribution characteristics of vascular endothelial growth factor-B(VEGF-B) in diencephalon and brainstem of Yak’s brain tissues, and to investigate the associations between its expression and hypoxia adaptation. Methods Five healthy yaks were selected, and the brain tissues were divided and collected according to the gross anatomical structure of the brain, including pituitary, thalamus, hypothalamus, oblongata and pons. The characteristics of expression and location of VEGF-B in different regions of Yak’s brain tissues were detected by Real-time PCR, Western blotting and immunohistochemical techniques. Results The results showed that the highest expression level of VEGF-B mRNA of yak brain tissue was in the pituitary, and the content was significantly higher than that found in other parts of the brain(P<0. 05). Following the expressions were in the hypothalamus, thalamus and medulla oblongata, while the lowest expression level was in pons. The expression level of VEGF-B protein in Yak’s brain tissue was similar to the mRNA expression level except that the thalamus was higher than that of hypothalamus. The result of immunohistochemistry showed that VEGF-B protein-positive substances were mainly distributed in the cytoplasm of various types of cells. Among them, the positive staining of VEGF-B was mainly concentrated in eosinophils of pituitary. The positive staining of VEGF-B was mainly concentrated in pleomorphic cells of thalamus and hypothalamus. The distribution of VEGF-B protein-positive substances were mainly focused in nerve cell body of medulla oblongata and pons. Conclusion VEGF-B protein is expressed in both diencephalon and brainstem of yak, which may be closely related to its functions of anti-apoptosis, "survival factor" and angiogenesis. However, the specific mechanism of its neuroprotective effect on Yak brain under hypoxic environment needs to be further studied. The difference of expression in different regions may be related to the tissue specificity and function in different regions of the brain.
RÉSUMÉ
In order to investigate the enzyme production mechanism of yak rumen-derived anaerobic fungus Orpinomyces sp. YF3 under the induction of different carbon sources, anaerobic culture tubes were used for in vitro fermentation. 8 g/L of glucose (Glu), filter paper (Flp) and avicel (Avi) were respectively added to 10 mL of basic culture medium as the sole carbon source. The activity of fiber-degrading enzyme and the concentration of volatile fatty acid in the fermentation liquid were detected, and the enzyme producing mechanism of Orpinomyces sp. YF3 was explored by transcriptomics. It was found that, in glucose-induced fermentation solution, the activities of carboxymethyl cellulase, microcrystalline cellulase, filter paper enzyme, xylanase and the proportion of acetate were significantly increased (P < 0.05), the proportion of propionate, butyrate, isobutyrate were significantly decreased (P < 0.05). The results of transcriptome analysis showed that there were 5 949 differentially expressed genes (DEGs) between the Glu group and the Flp group, 10 970 DEGs between the Glu group and the Avi group, and 6 057 DEGs between the Flp group and the Avi group. It was found that the DEGs associated with fiber degrading enzymes were significantly up-regulated in the Glu group. Gene ontology (GO) function enrichment analysis identified that DEGs were mainly associated with the xylan catabolic process, hemicellulose metabolic process, β-glucan metabolic process, cellulase activity, endo-1,4-β-xylanase activity, cell wall polysaccharide metabolic process, carbohydrate catabolic process, glucan catabolic process and carbohydrate metabolic process. Moreover, the differentially expressed pathways associated with fiber degrading enzymes enriched by Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis were mainly starch and sucrose metabolic pathways and other glycan degradation pathways. In conclusion, Orpinomyces sp. YF3 with glucose as carbon source substrate significantly increased the activity of cellulose degrading enzyme and the proportion of acetate, decreased the proportion of propionate, butyrate and isobutyrate. Furthermore, the degradation ability and energy utilization efficiency of fungus in the presence of glucose were improved by means of regulating the expression of cellulose degrading enzyme gene and participating in starch and sucrose metabolism pathway, and other glycan degradation pathways, which provides a theoretical basis for the application of Orpinomyces sp. YF3 in practical production and facilitates the application of Orpinomyces sp. YF3 in the future.
Sujet(s)
Animaux , Bovins , Neocallimastigales/métabolisme , Anaérobiose , Rumen/microbiologie , Propionates/métabolisme , Isobutyrates/métabolisme , Cellulose/métabolisme , Champignons , Amidon/métabolisme , Glucose/métabolisme , Acétates , Saccharose/métabolisme , Cellulases , CellulaseRÉSUMÉ
Abstract The telencephalon refers to the most highly developed and anterior part of the forebrain, consisting mainly of the cerebral hemispheres. The study determined Neuroglobin (Ngb) and Hypoxia-inducible factor (HIF-1α) expression in the telencephalon of yak and cattle, and compare the expression and distribution pattern of Ngb and HIF-1α in the two animals. Immunohistochemistry (IHC), quantitative real-time Polymerase Chain Reaction (qRT-PCR), and Western blot (WB) were employed to investigate Ngb and Hif-1α expression in the telencephalon of yak and cattle. mRNA and protein expressions of Ngb and HIF-1α showed positive in different tissues of the yak and cattle telencephalon. Ngb expression in tissues of the yak recorded higher as compare to cattle while HIF-1α expression was found higher in cattle than yak. The HIF-1α expression in some tissues of yak telencephalon was consistent with the cattle. The results documented that HIF-1α may have a direct or indirect synergistic effect on Ngb expression in the yak telencephalon to improve hypoxia adaptation. It is suggested that yak may need more Ngb expression for adaptation, but the expression of HIF-1α seems to be down-regulated during long-term adaptation, and the specific causes of this phenomenon needs to be further verified.
Resumo O telencéfalo refere-se à parte anterior e mais desenvolvida do prosencéfalo, consistindo principalmente dos hemisférios cerebrais. O estudo determinou a expressão de neuroglobina (Ngb) e fator indutível por hipóxia (HIF-1α) no telencéfalo de iaques e bovinos e comparou a expressão e o padrão de distribuição de Ngb e HIF-1α nos dois animais. Imuno-histoquímica (IHC), reação em cadeia da polimerase quantitativa em tempo real (qRT-PCR) e Western blot (WB) foram empregados para investigar a expressão de Ngb e Hif-1α no telencéfalo de iaques e bovinos. As expressões de mRNA e proteínas de Ngb e HIF-1α mostraram-se positivas em diferentes tecidos do telencéfalo de iaque e bovino. A expressão de Ngb nos tecidos do iaque foi registrada mais alta em comparação com o gado, enquanto a expressão do HIF-1α foi encontrada mais alta no gado do que no iaque. A expressão de HIF-1α em alguns tecidos do telencéfalo de iaque foi consistente com o gado. Os resultados documentaram que o HIF-1α pode ter um efeito sinérgico direto ou indireto na expressão de Ngb no telencéfalo de iaque para melhorar a adaptação à hipóxia. É sugerido que o iaque pode precisar de mais expressão de Ngb para adaptação, mas a expressão de HIF-1α parece ser regulada para baixo durante a adaptação de longo prazo, e as causas específicas desse fenômeno precisam ser verificadas.
Sujet(s)
Animaux , Télencéphale , Sous-unité alpha du facteur-1 induit par l'hypoxie/génétique , ARN messager/génétique , Bovins , Adaptation physiologique , NeuroglobineRÉSUMÉ
Abstract Background The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. Aim The study examined the expression of Neuroglobin (Ngb) and Hypoxia-inducible factor-1α (Hif-1α) in adult and young yak brain tissues, and provided researchers with meaningful insight into the anatomy, physiology, and biochemistry of this mammal. Method The study employed immunohistochemistry (IHC), quantitative real-time PCR (qRT-PCR), and Western blot (WB) to obtain the results. Results Ngb and Hif-1α were significantly (P<0.05) expressed in the cerebellar cortex, piriform lobe, medulla, and corpus callosum of the adult yak while in the young yak brain tissues, the protein expressions were significantly found in the white matter of the cerebellum, pineal gland, corpus callosum, and cerebellar cortex. The Ngb and Hif-1α expression showed similarities and differences. This may have resulted from similar animal species, source of nutrition, age factors, brain size, emotional activities, and communication. The findings documented that Ngb and Hif-1α are commonly expressed in various adult and young yak brain tissues. Multiple roles in the brain tissues of the adult and young yaks are involved in the expression and distribution and are proposed to play a significant role in the adaptation of the yak to the high altitude environment. Conclusion This study provides meaningful data to understand the adaptive mechanism to hypoxia and recommended researchers to expand on the adaptive mechanism and brain tissues that are not recorded.
Resumo Contexto O cérebro é um órgão que funciona como o centro do sistema nervoso em todos os animais vertebrados e na maioria dos invertebrados. Objetivo O estudo examinou a expressão de neuroglobina (Ngb) e fator-1α indutível por hipóxia (Hif-1α) em tecidos cerebrais de iaques adultos e jovens e forneceu aos pesquisadores uma visão significativa da anatomia, fisiologia e bioquímica desse mamífero. Método O estudo utilizou imuno-histoquímica (IHC), PCR quantitativo em tempo real (qRT-PCR) e western blot (WB) para a obtenção dos resultados. Resultados Ngb e Hif-1α foram significativamente (P < 0,05) expressos no córtex cerebelar, lobo piriforme, medula e corpo caloso do iaque adulto, enquanto nos tecidos cerebrais do iaque jovem as expressões proteicas foram encontradas significativamente na substância branca do cerebelo, glândula pineal, corpo caloso e córtex cerebelar. A expressão de Ngb e Hif-1α apresentou semelhanças e diferenças. Isso pode ter resultado de espécies animais semelhantes, fonte de nutrição, fatores de idade, tamanho do cérebro, atividades emocionais e comunicação. Os resultados documentaram que o Ngb e o Hif-1α são comumente expressos em vários tecidos cerebrais de iaques adultos e jovens. Múltiplos papéis nos tecidos cerebrais de iaques adultos e jovens estão envolvidos na expressão e distribuição e são propostos para desempenhar um papel significativo na adaptação do iaque ao ambiente de alta altitude. Conclusão Este estudo fornece dados significativos para compreender o mecanismo adaptativo à hipóxia e recomendou que os pesquisadores expandissem o mecanismo adaptativo e os tecidos cerebrais que não foram registrados.
Sujet(s)
Animaux , Sous-unité alpha du facteur-1 induit par l'hypoxie/génétique , Hypoxie , Encéphale , ARN messager , Bovins , NeuroglobineRÉSUMÉ
Background: The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. Aim: The study examined the expression of Neuroglobin (Ngb) and Hypoxia-inducible factor-1α (Hif-1α) in adult and young yak brain tissues, and provided researchers with meaningful insight into the anatomy, physiology, and biochemistry of this mammal. Method: The study employed immunohistochemistry (IHC), quantitative real-time PCR (qRT-PCR), and Western blot (WB) to obtain the results. Results: Ngb and Hif-1α were significantly (P<0.05) expressed in the cerebellar cortex, piriform lobe, medulla, and corpus callosum of the adult yak while in the young yak brain tissues, the protein expressions were significantly found in the white matter of the cerebellum, pineal gland, corpus callosum, and cerebellar cortex. The Ngb and Hif-1α expression showed similarities and differences. This may have resulted from similar animal species, source of nutrition, age factors, brain size, emotional activities, and communication. The findings documented that Ngb and Hif-1α are commonly expressed in various adult and young yak brain tissues. Multiple roles in the brain tissues of the adult and young yaks are involved in the expression and distribution and are proposed to play a significant role in the adaptation of the yak to the high altitude environment. Conclusion: This study provides meaningful data to understand the adaptive mechanism to hypoxia and recommended researchers to expand on the adaptive mechanism and brain tissues that are not recorded.
Contexto: O cérebro é um órgão que funciona como o centro do sistema nervoso em todos os animais vertebrados e na maioria dos invertebrados. Objetivo: O estudo examinou a expressão de neuroglobina (Ngb) e fator-1α indutível por hipóxia (Hif-1α) em tecidos cerebrais de iaques adultos e jovens e forneceu aos pesquisadores uma visão significativa da anatomia, fisiologia e bioquímica desse mamífero. Método: O estudo utilizou imuno-histoquímica (IHC), PCR quantitativo em tempo real (qRT-PCR) e western blot (WB) para a obtenção dos resultados. Resultados: Ngb e Hif-1α foram significativamente (P < 0,05) expressos no córtex cerebelar, lobo piriforme, medula e corpo caloso do iaque adulto, enquanto nos tecidos cerebrais do iaque jovem as expressões proteicas foram encontradas significativamente na substância branca do cerebelo, glândula pineal, corpo caloso e córtex cerebelar. A expressão de Ngb e Hif-1α apresentou semelhanças e diferenças. Isso pode ter resultado de espécies animais semelhantes, fonte de nutrição, fatores de idade, tamanho do cérebro, atividades emocionais e comunicação. Os resultados documentaram que o Ngb e o Hif-1α são comumente expressos em vários tecidos cerebrais de iaques adultos e jovens. Múltiplos papéis nos tecidos cerebrais de iaques adultos e jovens estão envolvidos na expressão e distribuição e são propostos para desempenhar um papel significativo na adaptação do iaque ao ambiente de alta altitude. Conclusão: Este estudo fornece dados significativos para compreender o mecanismo adaptativo à hipóxia e recomendou que os pesquisadores expandissem o mecanismo adaptativo e os tecidos cerebrais que não foram registrados.
Sujet(s)
Animaux , Jeune adulte , Adulte , Bovins , Bovins , Cerveau/anatomie et histologie , Cerveau/physiologie , Facteur-1 induit par l'hypoxie/analyse , Phénomènes biochimiques , Neuroglobine/analyseRÉSUMÉ
The telencephalon refers to the most highly developed and anterior part of the forebrain, consisting mainly of the cerebral hemispheres. The study determined Neuroglobin (Ngb) and Hypoxia-inducible factor (HIF-1α) expression in the telencephalon of yak and cattle, and compare the expression and distribution pattern of Ngb and HIF-1α in the two animals. Immunohistochemistry (IHC), quantitative real-time Polymerase Chain Reaction (qRT-PCR), and Western blot (WB) were employed to investigate Ngb and Hif-1α expression in the telencephalon of yak and cattle. mRNA and protein expressions of Ngb and HIF-1α showed positive in different tissues of the yak and cattle telencephalon. Ngb expression in tissues of the yak recorded higher as compare to cattle while HIF-1α expression was found higher in cattle than yak. The HIF-1α expression in some tissues of yak telencephalon was consistent with the cattle. The results documented that HIF-1α may have a direct or indirect synergistic effect on Ngb expression in the yak telencephalon to improve hypoxia adaptation. It is suggested that yak may need more Ngb expression for adaptation, but the expression of HIF-1α seems to be down-regulated during long-term adaptation, and the specific causes of this phenomenon needs to be further verified.
O telencéfalo refere-se à parte anterior e mais desenvolvida do prosencéfalo, consistindo principalmente dos hemisférios cerebrais. O estudo determinou a expressão de neuroglobina (Ngb) e fator indutível por hipóxia (HIF-1α) no telencéfalo de iaques e bovinos e comparou a expressão e o padrão de distribuição de Ngb e HIF-1α nos dois animais. Imuno-histoquímica (IHC), reação em cadeia da polimerase quantitativa em tempo real (qRT-PCR) e Western blot (WB) foram empregados para investigar a expressão de Ngb e Hif-1α no telencéfalo de iaques e bovinos. As expressões de mRNA e proteínas de Ngb e HIF-1α mostraram-se positivas em diferentes tecidos do telencéfalo de iaque e bovino. A expressão de Ngb nos tecidos do iaque foi registrada mais alta em comparação com o gado, enquanto a expressão do HIF-1α foi encontrada mais alta no gado do que no iaque. A expressão de HIF-1α em alguns tecidos do telencéfalo de iaque foi consistente com o gado. Os resultados documentaram que o HIF-1α pode ter um efeito sinérgico direto ou indireto na expressão de Ngb no telencéfalo de iaque para melhorar a adaptação à hipóxia. É sugerido que o iaque pode precisar de mais expressão de Ngb para adaptação, mas a expressão de HIF-1α parece ser regulada para baixo durante a adaptação de longo prazo, e as causas específicas desse fenômeno precisam ser verificadas.
Sujet(s)
Animaux , Bovins , Facteur-1 induit par l'hypoxie/analyse , Neuroglobine/analyse , Télencéphale , Immunohistochimie , Réaction de polymérisation en chaine en temps réel , Technique de WesternRÉSUMÉ
Abstract Background The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. Aim The study examined the expression of Neuroglobin (Ngb) and Hypoxia-inducible factor-1 (Hif-1) in adult and young yak brain tissues, and provided researchers with meaningful insight into the anatomy, physiology, and biochemistry of this mammal. Method The study employed immunohistochemistry (IHC), quantitative real-time PCR (qRT-PCR), and Western blot (WB) to obtain the results. Results Ngb and Hif-1 were significantly (P 0.05) expressed in the cerebellar cortex, piriform lobe, medulla, and corpus callosum of the adult yak while in the young yak brain tissues, the protein expressions were significantly found in the white matter of the cerebellum, pineal gland, corpus callosum, and cerebellar cortex. The Ngb and Hif-1 expression showed similarities and differences. This may have resulted from similar animal species, source of nutrition, age factors, brain size, emotional activities, and communication. The findings documented that Ngb and Hif-1 are commonly expressed in various adult and young yak brain tissues. Multiple roles in the brain tissues of the adult and young yaks are involved in the expression and distribution and are proposed to play a significant role in the adaptation of the yak to the high altitude environment. Conclusion This study provides meaningful data to understand the adaptive mechanism to hypoxia and recommended researchers to expand on the adaptive mechanism and brain tissues that are not recorded.
Resumo Contexto O cérebro é um órgão que funciona como o centro do sistema nervoso em todos os animais vertebrados e na maioria dos invertebrados. Objetivo O estudo examinou a expressão de neuroglobina (Ngb) e fator-1 indutível por hipóxia (Hif-1) em tecidos cerebrais de iaques adultos e jovens e forneceu aos pesquisadores uma visão significativa da anatomia, fisiologia e bioquímica desse mamífero. Método O estudo utilizou imuno-histoquímica (IHC), PCR quantitativo em tempo real (qRT-PCR) e western blot (WB) para a obtenção dos resultados. Resultados Ngb e Hif-1 foram significativamente (P 0,05) expressos no córtex cerebelar, lobo piriforme, medula e corpo caloso do iaque adulto, enquanto nos tecidos cerebrais do iaque jovem as expressões proteicas foram encontradas significativamente na substância branca do cerebelo, glândula pineal, corpo caloso e córtex cerebelar. A expressão de Ngb e Hif-1 apresentou semelhanças e diferenças. Isso pode ter resultado de espécies animais semelhantes, fonte de nutrição, fatores de idade, tamanho do cérebro, atividades emocionais e comunicação. Os resultados documentaram que o Ngb e o Hif-1 são comumente expressos em vários tecidos cerebrais de iaques adultos e jovens. Múltiplos papéis nos tecidos cerebrais de iaques adultos e jovens estão envolvidos na expressão e distribuição e são propostos para desempenhar um papel significativo na adaptação do iaque ao ambiente de alta altitude. Conclusão Este estudo fornece dados significativos para compreender o mecanismo adaptativo à hipóxia e recomendou que os pesquisadores expandissem o mecanismo adaptativo e os tecidos cerebrais que não foram registrados.
RÉSUMÉ
Abstract The telencephalon refers to the most highly developed and anterior part of the forebrain, consisting mainly of the cerebral hemispheres. The study determined Neuroglobin (Ngb) and Hypoxia-inducible factor (HIF-1) expression in the telencephalon of yak and cattle, and compare the expression and distribution pattern of Ngb and HIF-1 in the two animals. Immunohistochemistry (IHC), quantitative real-time Polymerase Chain Reaction (qRT-PCR), and Western blot (WB) were employed to investigate Ngb and Hif-1 expression in the telencephalon of yak and cattle. mRNA and protein expressions of Ngb and HIF-1 showed positive in different tissues of the yak and cattle telencephalon. Ngb expression in tissues of the yak recorded higher as compare to cattle while HIF-1 expression was found higher in cattle than yak. The HIF-1 expression in some tissues of yak telencephalon was consistent with the cattle. The results documented that HIF-1 may have a direct or indirect synergistic effect on Ngb expression in the yak telencephalon to improve hypoxia adaptation. It is suggested that yak may need more Ngb expression for adaptation, but the expression of HIF-1 seems to be down-regulated during long-term adaptation, and the specific causes of this phenomenon needs to be further verified.
Resumo O telencéfalo refere-se à parte anterior e mais desenvolvida do prosencéfalo, consistindo principalmente dos hemisférios cerebrais. O estudo determinou a expressão de neuroglobina (Ngb) e fator indutível por hipóxia (HIF-1) no telencéfalo de iaques e bovinos e comparou a expressão e o padrão de distribuição de Ngb e HIF-1 nos dois animais. Imuno-histoquímica (IHC), reação em cadeia da polimerase quantitativa em tempo real (qRT-PCR) e Western blot (WB) foram empregados para investigar a expressão de Ngb e Hif-1 no telencéfalo de iaques e bovinos. As expressões de mRNA e proteínas de Ngb e HIF-1 mostraram-se positivas em diferentes tecidos do telencéfalo de iaque e bovino. A expressão de Ngb nos tecidos do iaque foi registrada mais alta em comparação com o gado, enquanto a expressão do HIF-1 foi encontrada mais alta no gado do que no iaque. A expressão de HIF-1 em alguns tecidos do telencéfalo de iaque foi consistente com o gado. Os resultados documentaram que o HIF-1 pode ter um efeito sinérgico direto ou indireto na expressão de Ngb no telencéfalo de iaque para melhorar a adaptação à hipóxia. É sugerido que o iaque pode precisar de mais expressão de Ngb para adaptação, mas a expressão de HIF-1 parece ser regulada para baixo durante a adaptação de longo prazo, e as causas específicas desse fenômeno precisam ser verificadas.
RÉSUMÉ
Currently, as the key raw material of artificial biological heart valve, bovine pericardium is mainly depend on import and has become a "bottleneck" challenge, greatly limiting the development of domestic biological heart valve. Therefore, the localization of bovine pericardium is extremely urgent. In this study, the pericardium of Sichuan yak was compared with that of Australian cattle in terms of fundamental properties and anti-calcification performance. The results demonstrated that the appearance and thickness of yak pericardium were more advantageous than the Australian one. Sichuan yak pericardium and Australian cattle pericardium had comparable performance in shrinkage temperature, mechanical test and anti-calcification test. This study preliminarily verifies the feasibility of substitution of Australian cattle pericardium by Sichuan yak pericardium and promotes the progression of bovine pericardium localization with data support.
Sujet(s)
Animaux , Bovins , Australie , Bioprothèse , Prothèse valvulaire cardiaque , PéricardeRÉSUMÉ
Yak (Bos grunniens) is a unique bovine species and considered as lifeline of highlanders. The male subfertility in yak is a matter of concern that causes huge economic loses. The spermatogenesis and male reproduction machinery are critically governed by Y-linked genes which tend to acquire necessary information in the course of evolution. The Y-linked fertility genes are present in multiple copies with testis-limited expression. To understand this novel complexity, 12 male-specific region of Y chromosome (MSY) genes have been studied in the yak. Targeted genes are amplified in male and female genomic DNA and confirmed the male derived specificity. Moreover, testis and sperm-specific expressions of MSY genes are distinct among different tissues. The quantitative polymerase chain reaction results validate the expression pattern of these genes in various tissues with predominant expression intestis and sperm. The sequencing of resultant yak MSY genes gives significant result and shows similarity with cattle (Bos indicus), but few nucleotide mismatches define the proposition of infertile male in the F1 hybrid of cattle and yak. The identified MSY genes can be used to establish male-specific characteristics and to differentiate male and female yak genotypically. Further, these genes may act as valuable resources to understand the capacity of spermatogenesis, embryogenesis, cellular growth, azoospermia and malesubfertility in the yak.
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Yak, an economically important bovine species considered as lifeline of the Himalaya. Indeed, this gigantic bovine is neglected because of the scientific intervention for its conservation as well as research documentation for a long time. Amelogenin is an essential protein for tooth enamel which eutherian mammals contain two copies in both X and Y chromosome each. In bovine, the deletion of a fragment of the nucleotide sequence in Y chromosome copy of exon 6 made Amelogenin an excellent sex-specific marker. Thus, an attempt was made to use the gene as an advanced molecular marker of sexing of the yak to improve breeding strategies and reproduction. The present study confirmed that the polymerase chain reaction amplification of the Amelogenin gene with a unique primer is useful in sex identification of the yak. The test is further refined with qPCR validation by quantifying the DNA copy number of the Amelogenin gene in male and female. We observed a high level of sequence polymorphisms of AMELX and AMELY in yak considered as novel identification. These tests can be further extended into several other specialized fields includingforensics, meat production and processing, and quality control.
RÉSUMÉ
Objective: To establish a rapid on-site method for identifying Chinese medical material recombinase-mediated amplification (RAA) technology for the use of identifying medicinal Bubali Cornu from yak horn. Method: Based on the differences of mitochondrial genome sequences between Bubali Cornu and adulterants,the specific RAA primer (SNJ-1.F,SNJ-1.R) and fluorescence probe SNJ-1.probe were designed by variation sites. Alkaline lysis method was used to extract DNA from milled samples,and optimize RAA reaction system. The incubation was made at 37℃ for 15-20 min, the reaction results were monitored through gel electrophoresis and a mobile fluorescence amplification instrument. The RAA identification result was compared with COI DNA sequencing. Result: After incubation at 37℃ for 20 min,about 140 bp of bright and simple bands was amplified from DNA templates of Bubalus bubalis,whereas Bos mutus were negative. By the Real-time fluorescent RAA identify method,all reactions in DNAs from Bubali Cornu samples were amplified from 6.21 to 8.37 min,whereas DNAs from yak samples were amplified after 10.08 min,COI sequencing results conformed to the Real-time fluorescent RAA identification. Conclusion: Specific RAA could rapidly identify Bubali Cornu in 20 minutes, and thus be applied in medical material and its products. This method is simple,rapid and sophisticated instrument-free,with promises in on-site identification of traditional Chinese medicine.
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Objective To explore the feasibility of the application of yak pericardium as anti-calcified heart valve materials in transcatheter aortic valve replacement (TAVR). Cattle pericardium and commercial Sino products were used as controls. Methods Yak and cattle pericardium was decellularized, and then the acellular extent was qualitatively and quantitatively analyzed with hematoxylin-eosin (HE) staining and DNA detection kit respectively. Two cross-linking agents, i.e. glutaraldehyde and genipin, were used to cross-link the acellular pericardium, respectively. After testing the mechanical property, thermodynamic stability and biocompatibility of the pericardium, the cross-linked pericardium was subcutaneously implanted in juvenile Wistar rats. After 2~4 weeks of the implantation, histological staining and tissue calcification analysis were conducted. Results The nuclei of the yak pericardium were almost invisible after decellularized treatment, and the DNA content decreased from (0.90±0.13)μg/mg to (0.09± 0.02)μg/mg that was significantly lower than that of Sino product (P<0.001). The mechanical strength of the acellular yak pericardium, glutaraldehyde or genipin cross-linked yak pericardium was higher than that of the cattle pericardium (all P<0.05). The maximum stress value, obtained in the glutaraldehyde cross-linked yak pericardium, was (8.44±2.61) MPa, which was higher than (7.92±1.81) MPa of the Sino product (P<0.05). The shrinkage temperature of non- and cross-linked yak pericardium was slightly higher than that of cattle pericardium, but difference was not statistically significant (all P>0.05). For the two cross-linked yak pericardium, the hemolysis rate and cell proliferation ratio was similar with that of cattle pericardium (all P>0.05), the tissue regeneration ability of subcutaneous implantations was inferior, and the calcification level was higher than that of cattle pericardium with an no statistically significant difference (all P>0.05). After 4 weeks of the subcutaneously implantation, the calcium content of the glutaraldehyde cross-linked pericardium was 32.62~65.49μg/mg. Conclusions Yak pericardium has better mechanical properties and thermodynamic stability than cattle pericardium, and the biocompatibility can meet the requirements of transcatheter aortic valve replacement.
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The Emergency Medicine Recipes in Local Medicinals (鄕藥救急方, Hyang'yak Kugŭpbang) (c. 14th century) is known to be one of the oldest Korean medical textbooks that exists in its entirety. This study challenges conventional perceptions that have interpreted this text by using modern concepts, and it seeks to position the medical activities of the late Koryŏ Dynasty 高麗 (918–1392) to the early Chosŏn Dynasty 朝鮮 (1392–1910) in medical history with a focus on this text. According to existing studies, Emergency Medicine Recipes in Local Medicinals is a strategic compromise of the Korean elite in response to the influx of Chinese medical texts and thus a medical text from a “periphery” of the Sinitic world. Other studies have evaluated this text as a medieval publication demonstrating stages of transition to systematic and rational medicine and, as such, a formulary book 方書 that includes primitive elements. By examining past medicine practices through “modern” concepts based on a dichotomous framework of analysis — i.e., modernity vs. tradition, center vs. periphery, science vs. culture — such conventional perceptions have relegated Emergency Medicine Recipes in Local Medicinals to the position of a transitional medieval publication meaningful only for research on hyangchal 鄕札 (Chinese character-based writing system used to record Korean during the Silla Dynasty 新羅 [57 BC–935 AD] to the Koryŏ Dynasty). It is necessary to overcome this dichotomous framework in order to understand the characteristics of East Asian medicine. As such, this study first defines “medicine 醫”, an object of research on medical history, as a “special form of problem-solving activities” and seeks to highlight the problematics and independent medical activities of the relevant actors. Through this strategy (i.e., texts as solutions to problems), this study analyzes Emergency Medicine Recipes in Local Medicinals to determine its characteristics and significance. Ultimately, this study argues that Emergency Medicine Recipes in Local Medicinals was a problem-solving method for the scholar-gentry 士人層 from the late Koryŏ Dynasty to the early Chosŏn Dynasty, who had adopted a new cultural identity, to perform certain roles on the level of medical governance and constitute medical praxis that reflected views of both the body and materials and an orientation distinguished from those of the so-called medicine of Confucian physicians 儒醫, which was the mainstream medicine of the center. Intertwined at the cultural basis of the treatments and medical recipes included in Emergency Medicine Recipes in Local Medicinals were aspects such as correlative thinking, ecological circulation of life force, transformation of materiality through contact, appropriation of analogies, and reasoning of sympathy. Because “local medicinals 鄕藥” is understood in Emergency Medicine Recipes in Local Medicinals as referring to objects easily available from one's surroundings, it signifies locality referring to the ease of acquisition in local areas rather than to the identity of the state of Koryŏ or Chosŏn. As for characteristics revealed by this text's methods of implementing medicine, Korean medicine in terms of this text consisted largely of single-ingredient formulas using diverse medicinal ingredients easily obtainable from one's surroundings rather than making use of general drugs as represented by materia medica 本草 or of multiple-ingredient formulas. In addition, accessible tools, full awareness of the procedures and processes of the guidelines, procedural rituals, and acts of emergency treatment (first aid) were more important than the study of the medical classics, moral cultivation, and coherent explanations emphasized in categorical medical texts. Though Emergency Medicine Recipes in Local Medicinals can be seen as an origin of the tradition of emergency medicine in Korea, it differs from medical texts that followed which specializing in emergency medicine to the extent that it places toxicosis 中毒 before the six climatic factors 六氣 in its classification of diseases.
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Humains , Asiatiques , Comportement cérémoniel , Classification , Urgences , Médecine d'urgence , Traitement d'urgence , Extrême-Orient , Corée , Matière médicale , Médecine traditionnelle d'Asie orientale , Méthodes , Publications , Pensée (activité mentale) , ÉcritureRÉSUMÉ
Bile acids( BAs),the major constituents of bile,are also known to be potential biomarkers of various diseases,especially liver disease. The systematic analysis of BAs is believed to be of great importance towards the clarification of the effective material basis for bile-type medicines,and the diagnosis and therapy of related diseases as well. As a part of systematic study on bile-type medicine ongoing in our group,this study lays emphasis on the isomer discrimination,and the improvement of analytical method of BAs. Further,this method was subsequently applied to elucidate in depth the chemical profile of BAs in yak bile. Regarding isomer discrimination for BAs,we constructed relative response-collision energy curves( RRCECs) by high performance liquid chromatographyion trap-time of flight-mass spectrometry( HPLC-IT-TOF-MS) in combination with high performance liquid chromatography-triple quadrupole-linear ion trap mass spectrometry( HPLC-Qtrap-MS). As a result,both the optimum collision energy( OCE) and CE_(50) exhibited great correlations with structural characteristics,thus enabling the isomer distinguishing,such as unconjugated BAs,glycine-conjugated BAs,and taurine-conjugated BAs. According to information provided by mass spectrometry,the comparison of OCE and CE_(50),retention time matching,combined with reference substances and database retrieval,a total of 30 bile acid derivatives were observed and identified in yak bile. The newly developed method could serve as a feasible tool for the in-depth characterization of BAs in bile and biological samples.
Sujet(s)
Animaux , Bovins , Bile , Chimie , Acides et sels biliaires , Chimie , Chromatographie en phase liquide à haute performance , Spectrométrie de masse , TaurineRÉSUMÉ
The aim of this study was to determine the seroprevalence and risk factors of fascioliasis in yaks, Bos grunniens, from 3 counties of Gansu Province in China. A total of 1,584 serum samples, including 974 samples from white yaks from Tianzhu, 464 from black yaks from Maqu, and 146 from black yaks from Luqu County, were collected and analyzed using ELISA to detect IgG antibodies against Fasciola hepatica. The overall F. hepatica seroprevalence was 28.7% (454/1,584), with 29.2% in white yaks (284/974) and 27.9% in black yaks (170/610). The seroprevalence of F. hepatica in yaks from Tianzhu, Luqu, and Maqu was 29.2%, 22.6%, and 29.5%, respectively. Female yaks (30.9%) had higher F. hepatica seroprevalence than male yaks (23.4%). Also, F. hepatica seroprevalence varied by different age group from 24.1% to 33.8%. Further, the seroprevalence ranged from 21.8% to 39.1% over different seasons. Interestingly, the season and age of yaks were associated with F. hepatica infection in yaks in the investigated areas. These findings provided a basis for further studies on this disease in yaks from 3 counties of Gansu Province in northwestern China, which may ultimately support the development of effective control strategies of fascioliasis in these areas.
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Animaux , Bovins , Femelle , Humains , Mâle , Anticorps , Chine , Test ELISA , Fasciola hepatica , Fasciolase , Immunoglobuline G , Ranonculaceae , Facteurs de risque , Saisons , Études séroépidémiologiquesRÉSUMÉ
This study aims to understand the Escherichia coli drug resistance isolated from different parts of Tibet yak in order to provide scientific evidence for controling Escherichia coli.PCR analysis of drug resistance phenotype and drug resistance gene of aminoglycosides,florfenicol and sulfonamides were carried out in 200 strains of yak-derived Escherichia coli from 6 different places in Tibet.The results showed that the resistance rate of aminoglycoside to yak-derived Escherichia coli was 96% of amikacin,94.59% of streptomycin,19% of neomycin,23% of gentamicin,19% of kanamycin.The detection rate of rmtB gene was 100%.The drug resistance rate of florfenicol was 25% with 25% detection rate of resistance geneflor.The resistance rate of sulfonamides was 32% with 7%,7% and 17% detection rates of sul1,sul2 and sul3 respectively genes,Moreover,the result of drug resistance phenotype was consistent with that of drug resistance gene.Meanwhile,the expression of sull gene in different regions of Tibet were different in drug resistance of the bacilli,and those from the population-intensive and flow-sensitive Lhasa,Nyingchi and Xigaze were more resistant to drug resistance,while those from Ali,Shannan and Nagqu were relatively light.The above-mentioned drug-resistant phenotype and drug resistance genes were detected in different cities and regions of Tibet,and there were multiple drug-resistant phenomena.The results showed that there was resistance to Escherichia coli in Tibetan yak,which should be paid attention to,and suggested that the in Tibetan area the antibiotics should be rationally used to reduce the drug resistance.
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Toxocara vitulorum has been rarely reported in yaks at high altitudes and remote areas of Sichuan Province of Tibetan Plateau of China. The current study was designed to investigate the prevalence, associated risk factors, and phylogenetic characteristics of T. vitulorum in yak calves on the Qinghai Tibetan plateau. Fecal samples were collected from 891 yak calves and were examined for the presence of T. vitulorum eggs by the McMaster technique. A multivariable logistic regression model was employed to explore variables potentially associated with exposure to T. vitulorum infection. T. vitulorum specimens were collected from the feces of yaks in Hongyuan of Sichuan Province, China. DNA was extracted from ascaris. After PCR amplification, the sequencing of ND1 gene was carried out and phylogenetic analyses was performed by MEGA 6.0 software. The results showed that 64 (20.1%; 95% CI 15.8–24.9%), 75 (17.2; 13.8–21.1), 29 (40.9; 29.3–53.2), and 5 (7.6; 2.5–16.8) yak calves were detected out to excrete T. vitulorum eggs in yak calve feces in Qinghai, Tibet, Sichuan, and Gansu, respectively. The present study revealed that high infection and mortality by T. vitulorum is wildly spread on the Qinghai Tibetan plateau, China by fecal examination. Geographical origin, ages, and fecal consistencies are the risk factors associated with T. vitulorum prevalence by logistic regression analysis. Molecular detection and phylogenetic analysis of ND1 gene of T. vitulorum indicated that T. vitulorum in the yak calves on the Qinghai Tibetan plateau are homologous to preveiously studies reported.
Sujet(s)
Animaux , Bovins , Altitude , Ascaris , Chine , ADN , Oeufs , Fèces , Modèles logistiques , Mortalité , Ovule , Réaction de polymérisation en chaîne , Prévalence , Facteurs de risque , Tibet , ToxocaraRÉSUMÉ
Six abomasums of yaks (Bosgrunniens) were studied with gross dissection and histological methods. It was found that the mucosa of the yak abomasum was covered with simple columnar epithelium. There were lots of spiral folds (10) in the fundic glandular area. The developed membrane of lamina propria was occupied by high density glands. According to the morphological characteristics of the glands, the abomasum was divided into the cardiac, gastric and pyloric glands. Cardiac glands were curved tubular glands with the intumescent bottom and small glandular cavity. Fundic glands were simple tubular glands or branched tubular glands, where the chief, parietal and mucous neck cells can be observed clearly. Pyloric glands were curled tubular glands, the closer to the deep of the lamina propria, the more obvious the glands curl. Staining of glycoconjugate revealed that the mucosal epithelium of the cardiac gastric and pyloric glands and gastric pits epithelium mainly secreted neutral glycoconjugate, but other portions of cardiac and gastric glands secreted mixed and acid glycoconjugate respectively. By Gordon-Sweet's reticular fiber staining, it was found that the mucous neck cells possessed the characteristic of argyrophilic phenomenon. There was a large number of argyrophilic granules in the supranuclear cytoplasm in contrast with the chief cells. Furthermore, there were isolated lymphoid nodules and diffuse lymphoid tissue in the abomasum glands, especially in corpus abomasi. Grimelius silver staining showed that the argyrophil cells were located in the glandular epithelium and lamina propria of glands, which can also be observed in connective tissue. These endocrine cells dispersed individually in epithelial cells, occasionally in 35 cell groups. Therefore, the yaks were grazed throughout the year on diverse natural grassland and had evolved morphological characteristics of the abomasum enabling them to consume a wide variety of plant species, thereby better adapting them to harsh plateau environment.
Seis abomaso yak (Bosgrunniens) fueron estudiados con disección y métodos histológicos. Se encontró que la mucosa del abomaso yak estaba cubierta de epitelio columnar simple. Se observaron pliegues en espiral (10) en la zona glandular fúndica. La membrana desarrollada de la lámina propia contenía glándulas de alta densidad. De acuerdo con las características morfológicas de las glándulas, el abomaso se dividió en las glándulas cardíacas, gástricas y pilórica. Las glándulas cardíacas se curvan en glándulas tubulares con la parte inferior intumescente y una pequeña cavidad glandular. Las glándulas fúndicas eran glándulas tubulares simples o glándulas tubulares ramificadas, donde se pueden observar con claridad las células principales, parietales y mucosas del cuello. Las glándulas pilóricas fueron glándulas tubulares curvadas, cuanto más cercanas a la lámina propia, más evidente fue su forma ondulada. La tinción glucoconjugada reveló que el epitelio de la mucosa de las glándulas gástricas cardiacas, pilóricas y el epitelio de las fosas gástricas secretaron principalmente un glucoconjugado neutro, pero otras porciones cárdicas y de las glándulas gástricas secretaron un glucoconjugado mixto y ácido, respectivamente. A la tinción de fibras reticulares, se encontró que las células mucosas del cuello poseían características argirófilas. Se observó un gran número de gránulos en el citoplasma supranuclear en contraste con las células principales. Además, no fueron aislados los nódulos linfoides y presentaba tejido linfoide difuso en las glándulas de abomaso, especialmente en el cuerpo del abomaso. La tinción Gordon Sweet indicó que las células argirofílicas se localizaron en el epitelio y lámina propia glandular, lo que también se observó en el tejido conectivo. Estas células endocrinas se dispersan individualmente en las células epiteliales, de vez en cuando en grupos celulares de 3-5. De esta forma, los yak pastorean durante todo el año, en diversos pastizales naturales, y han evolucionado sus características morfológicas que les permiten consumir una amplia variedad de especies de plantas, con lo que se adaptan mejor a las condiciones inhóspitas.