RESUMO
The wide use of high-fat diet (HFD) causes negative effects on flesh quality in farmed fish. l-carnitine, a lipid-lowering additive, enhances mitochondrial fatty acid ß-oxidation. However its roles in alleviating the effects of HFD on flesh quality in fish are unknown. We fed Nile tilapia with medium-fat diet (MFD, 6% dietary lipid), high-fat diet (HFD, 12% dietary lipid) and HFCD supplemented with l-carnitine (HFCD + 400 mg/kg l-carnitine) for 10 weeks. The HFD-fed fish had higher fat deposition, pH value, myofiber density and flesh hardness than those fed on MFD. However, feeding the fish with the HFCD improved lipid catabolism, which increased significantly lactic acid content and myofiber diameter in muscle, thus reduced pH and hardness values. HFCD also reduced endoplasmic reticulum stress and myofiber apoptosis caused by HFD in the fish. Our study suggests that dietary l-carnitine supplementation alleviates the negative effects of HFD on flesh quality of farmed fish.
Assuntos
Ciclídeos , Ração Animal/análise , Animais , Carnitina/metabolismo , Ciclídeos/metabolismo , Dieta , Dieta Hiperlipídica/efeitos adversos , Suplementos Nutricionais , Dureza , Concentração de Íons de HidrogênioRESUMO
A highly efficient di-C-glycosyltransferase GgCGT was discovered from the medicinal plant Glycyrrhiza glabra. GgCGT catalyzes a two-step di-C-glycosylation of flopropione-containing substrates with conversion rates of >98%. To elucidate the catalytic mechanisms of GgCGT, we solved its crystal structures in complex with UDP-Glc, UDP-Gal, UDP/phloretin, and UDP/nothofagin, respectively. Structural analysis revealed that the sugar donor selectivity was controlled by the hydrogen-bond interactions of sugar hydroxyl groups with D390 and other key residues. The di-C-glycosylation capability of GgCGT was attributed to a spacious substrate-binding tunnel, and the G389K mutation could switch di- to mono-C-glycosylation. GgCGT is the first di-C-glycosyltransferase with a crystal structure, and the first C-glycosyltransferase with a complex structure containing a sugar acceptor. This work could benefit the development of efficient biocatalysts to synthesize C-glycosides with medicinal potential.
Assuntos
Glicosiltransferases/química , Glicosiltransferases/metabolismo , Glycyrrhiza/enzimologia , Clonagem Molecular , Cristalografia por Raios X , Glicosilação , Glicosiltransferases/genética , Glycyrrhiza/genética , Ligantes , Modelos Moleculares , Floretina/química , Floretina/metabolismo , Especificidade por Substrato , Transcriptoma , Uridina Difosfato Galactose/química , Uridina Difosfato Galactose/metabolismo , Uridina Difosfato Ácido Glucurônico/química , Uridina Difosfato Ácido Glucurônico/metabolismo , Uridina Difosfato N-Acetilglicosamina/química , Uridina Difosfato N-Acetilglicosamina/metabolismo , Uridina Difosfato Xilose/química , Uridina Difosfato Xilose/metabolismoRESUMO
This work reports on a molybdenum disulfide (MoS2) based field-effect transistor (FET) biosensor for ultrasensitive label-free detection of DNA via phosphorodiamidate morpholino oligos (PMO)-DNA hybridization. After the chip was fabricated and the sensing channel was modified with positive charges, the negatively charged MoS2 nanosheet was drop-casted onto the channel, enabling MoS2 to tightly bind to the sensing surface via electrostatic interactions. Meanwhile, DNA analogue, PMO, was immobilized on the MoS2 surface, and detection of PMO-DNA hybridization was conducted by the fabricated MoS2 FET biosensor. Due to the neutral character and high affinity of PMO, a limit of detection (LOD) down to 6 fM was obtained, which is lower than that of the previously reported MoS2 FET DNA biosensor based on DNA-DNA hybridization. In addition, the MoS2 FET biosensor also showed high sequence specificity capable of distinguishing the complementary DNA from one-base mismatched DNA, three-base mismatched DNA and noncomplementary DNA. Moreover, the unique FET biosensor was able to detect DNA in complex sample like serum, making the method potential in disease diagnostics.
Assuntos
Técnicas Biossensoriais/instrumentação , DNA/análise , Dissulfetos/química , Molibdênio/química , Morfolinos/química , Hibridização de Ácido Nucleico , Transistores Eletrônicos , DNA/sangue , Desenho de Equipamento , Humanos , Limite de Detecção , Nanoestruturas/químicaRESUMO
ETHNOPHARMACOLOGICAL RELEVANCE: Physalis alkekengi L. var. franchetii (Solanaceae) has been widely used in Chinese folk medicine due to its wide distribution throughout the country, for the treatment of a wide range of diseases including heat and cold, sore throat, fever, fungal infection, inflammation, toothache, rheumatism, burn, analgesic, ulcer and urinary diseases. However, the effect of P. alkekengi var. franchetii on ulcer and Helicobacter pylori infection has not been reported to date. AIM OF THE STUDY: This study was designed to investigate the anti-inflammatory, anti-ulcer, anti-Helicobacter pylori and analgesic properties of ethyl acetate fraction of the crude aqueous methanolic extract from the aerial parts of the plant P. alkekengi L. var. franchetii in rodents. MATERIALS AND METHODS: Acute toxicity of the crude extract of P. alkekengi L. var. franchetii (PAF) was evaluated in rats. The petroleum ether fraction (PEF), butanol fraction (BF), ethyl acetate fraction (EAF) and aqueous fraction (AF) of crude aqueous methanolic extract from PAF were screened for anti-inflammatory and anti-ulcer potential at doses of 100, 250 and 500mg/kg (p.o.), using carrageenin-induced hind paw edema and ethanol-induced gastric lesions test in rats. In vitro anti-Helicobacter pylori activity of EAF was assayed subsequently. In addition, three doses of EAF were evaluated for analgesic activity using hot plate and writhing tests, respectively. Finally, we performed a phytochemical analysis of EAF. RESULTS: Four fractions of crude extract from PAF significantly reduced the paw volume in carrageenin-induced hind paw edema model at different doses (100, 250 and 500mg/kg, p.o.). The fraction EAF at a dose of 500mg/kg exhibited the highest (75.92%) (0.150 ± 0.045***, ***p < 0.001) anti-inflammatory potential, which is similar to indomethacin (***P < 0.001)ï¼0.120 ± 0.014***, 80.74% inhibition of inflammationï¼ at 5mg/kg. Pretreatment with EAF (500mg/kg, p.o.) significantly reduced the intensity of gastric mucosal damage and showed higher gastroprotective activity (90.6%) when compared to the standard drug famotidine (84.6%). In addition, EAF fraction also showed a moderate (P < 0.05) anti-Helicobacter pylori activity with a minimal inhibition concentration (MIC) of 500µg/ml. Furthermore, pain sensation was effectively inhibited at 500mg/kg, p.o. of EAF as manifested by an increase (p < 0.001) of latency time in hot plate from 30 to 90min and a decrease (p < 0.001) in count of writhing induced by acetic acid. By HPLC, we determined some steroid, terpenoid and flavonoids (four compounds): kaempferol, quercetin, Blumenol A and physalindicanols A, which were isolated from the ethyl acetate fraction and identified using 1H NMR and 13C NMR spectra analysis. CONCLUSION: This study demonstrated the anti-inflammatory, anti-ulcer, anti-Helicobacter pylori and analgesic properties of EAF of the crude extract from PAF thus justifying its traditional usage.
Assuntos
Analgésicos/uso terapêutico , Antibacterianos/uso terapêutico , Anti-Inflamatórios/uso terapêutico , Antiulcerosos/uso terapêutico , Physalis , Extratos Vegetais/uso terapêutico , Acetatos/química , Ácido Acético , Analgésicos/farmacologia , Animais , Antibacterianos/farmacologia , Anti-Inflamatórios/farmacologia , Antiulcerosos/farmacologia , Carragenina , Edema/induzido quimicamente , Edema/tratamento farmacológico , Etanol , Feminino , Helicobacter pylori/efeitos dos fármacos , Helicobacter pylori/crescimento & desenvolvimento , Masculino , Camundongos , Dor/induzido quimicamente , Dor/tratamento farmacológico , Componentes Aéreos da Planta , Extratos Vegetais/farmacologia , Ratos Wistar , Solventes/química , Úlcera Gástrica/induzido quimicamente , Úlcera Gástrica/tratamento farmacológicoRESUMO
BACKGROUND: Fructus Sophorae pill, one of the traditional Chinese medicine, was widely used for hemorrhoids, hypertension and odontalgia. This paper describes a sensitive and specific assay for the determination of the 15 active constituents (sophoricoside, genistin, genistein, rutin, quercetin, kaempferol, baicalein, baicalin, naringin, naringenin, hesperidin, neohesperidin, wogonin and cimifugin, prim-O-glucosylcimifugin) in Fructus Sophorae pill. MATERIALS AND METHODS: Chromatographic separation was performed on a C18 column with acidified aqueous methanol gradients at a flow rate of 0.8 mL/min. The identification and quantification of the analytes were achieved by use of a hybrid quadrupole linear ion trap mass spectrometer. Multiple-reaction monitoring scanning was applied to quantification with switching electrospray ion source polarity between positive and negative modes. RESULTS: The proposed method was used to analyze 40 batches of samples with good linearity (r, 0.9990-0.9999), intraday precisions (RSD, 0.14-2.55%), interday precisions (RSD, 0.51-2.81%), stability (RSD, 0.31-2.65%), and recovery (RSD, 1.29-2.95%) of the 15 compounds. In addition, the hierarchical cluster analysis, including a method called furthest neighbor and nearest neighbor, was employed to classify samples according to characteristics of the 15 constituents. CONCLUSION: The results indicated that the analytical method was rapid, reliable, simple and suitable for the quality evaluation of Fructus Sophorae pill.
RESUMO
Phytoestrogens are candidate drugs for the treatment of osteoporosis. Many experiments have been designed to investigate the preventive effects of phytoestrogens for osteoporosis; however, it is easy for a single dissenting result from animal experiments to mislead clinical investigations. Herein, we use meta-analysis to assess the evidence for a protective effect of phytoestrogens on ovariectomized rat models of osteopenia. With respect to osteoporosis, PubMed and Web of Science were searched from January 2000 to March 2013 for relevant studies of phytoestrogens in ovariectomized rats. Two reviewers independently selected and assessed the studies. Data were aggregated using a random effects model. Meta-analysis revealed that the phytoestrogen treatment group demonstrated a significantly higher femur bone mineral density and trabecular bone and lower bone turnover markers (serum alkaline phosphatase and serum osteocalcin) compared with the control ovariectomized group, thus showing a bone protective effect of phytoestrogens in ovariectomized rats. Subsequent sensitivity analyses indicated that the effect of phytoestrogens on serum alkaline phosphatase and serum osteocalcin are not robust. Despite the high heterogeneity in the systematic review of animal experiments, the present results indicated that phytoestrogens may offer the most potential for the prevention of bone loss by reducing the expected loss of trabecular bone and bone mineral density. Their effects are likely due to inhibition of bone resorption, but their benefits on bone formation are still unclear. Further studies are needed to assess the effect of phytoestrogens on bone formation and the efficacy and safety of individual phytoestrogens.
Assuntos
Densidade Óssea/efeitos dos fármacos , Osso e Ossos/efeitos dos fármacos , Osteoporose/prevenção & controle , Fitoestrógenos/farmacologia , Fosfatase Alcalina/sangue , Animais , Reabsorção Óssea/prevenção & controle , Bases de Dados Factuais , Feminino , Osteocalcina/sangue , Osteogênese/efeitos dos fármacos , Ovariectomia , RatosRESUMO
The aim of this study was to assess the ability of a traditional Chinese medicinal ginger root extract (GRE) to prevent behavioral dysfunction in the Alzheimer disease (AD) rat model. Rat AD models were established by an operation (OP) in which rats were treated with a one-time intra-cerebroventricuIar injection of amyloid ß-protein (Aß) and continuous gavage of aluminum chloride every day for 4 weeks. GRE was administered intra-gastrically to rats. After 35 days, learning and memory were assessed in all of the rats. Brain sections were processed for immunohistochemistry and Hematoxylin & Eosin (H&E) and Nissl staining. The latency to show significant memory deficits was shorter in the group that received OP with a high dose of GRE (HG)(OP+HG) than in the groups that received OP with a low or moderate dose of GRE (LG, MG)(OP+LG, OP+MG) (p<0.05). The expression of superoxide dismutase (SOD) and catalase (CAT) in the OP+MG and OP+LG groups was up-regulated compared to the OP+HG groups (p<0.05). The rats in the OP+HG groups had lower levels of nuclear factor-κB (NF-κB), interleukin-1ß (IL-1ß), and malondialdehyde (MDA) expression than the rats in the OP+MG and OP+LG groups (p<0.05). This experiment demonstrates that the administration of GRE reverses behavioral dysfunction and prevents AD-like symptoms in our rat model.
Assuntos
Doença de Alzheimer/tratamento farmacológico , Doença de Alzheimer/fisiopatologia , Comportamento Animal , Fármacos Neuroprotetores/uso terapêutico , Extratos Vegetais/uso terapêutico , Zingiber officinale , Doença de Alzheimer/enzimologia , Doença de Alzheimer/patologia , Animais , Comportamento Animal/efeitos dos fármacos , Catalase/metabolismo , Feminino , Imuno-Histoquímica , Interleucina-1beta/metabolismo , Malondialdeído/metabolismo , NF-kappa B/metabolismo , Fármacos Neuroprotetores/farmacologia , Extratos Vegetais/farmacologia , Ratos , Ratos Sprague-Dawley , Coloração e Rotulagem , Superóxido Dismutase/metabolismoRESUMO
Using water hyacinth and other fast-growing and high biomass of floating plants to purify polluted water has become an efficient and effective ecological restoration method at present. Effects of nutrients adsorption and water purification of planting water hyacinth on water quality in Zhushan Bay were studied. The results indicated that no anoxia was observed in water hyacinth planting areas because of wave disturbance and strong water exchange. Concentrations of TN and TP in water hyacinth planting areas were higher than that in the outside of stocking area (the content ranged 3.03-7.45 mg/L and 0.15-0.38 mg/L, respectively), and the content changes ranged 3.37-8.02 mg/L and 0.15-0.36 mg/L,respectively. The higher concentration of TN and TP in water indicated the water body was heavily polluted. Water hyacinth roots have a strong ability to adsorb suspended solids and algae cells, the concentration of Chl-a in stocking areas was higher than that in stocking fringe and outside, the maximum Chlorophyll in the stocking region in August was 177.01 mg/m3, and at the same time the concentrations in planting fringe and outside were 101.53 mg/m3 and 76.96 mg/m, respectively. Higher Chl-a content on water hyacinth roots indicated that water hyacinth had strong blocking effects on algae cells, and demonstrated it had a great purification effects on eutrophicated water, and it also provides a basis for the larger polluted water bodies purification in using water hyacinth.
Assuntos
Hyacinthus/metabolismo , Poluentes Químicos da Água/isolamento & purificação , Purificação da Água/métodos , Biodegradação Ambiental , China , Água Doce/análise , Hyacinthus/crescimento & desenvolvimento , Nitrogênio/isolamento & purificação , Nitrogênio/metabolismo , Fósforo/isolamento & purificação , Fósforo/metabolismo , Poluentes Químicos da Água/metabolismoRESUMO
ETHNOPHARMACOLOGICAL RELEVANCE: To assess the ability of traditional Chinese medicine Polygonatum sibiricum polysaccharide to prevent bone loss in the ovariectomized rat. MATERIALS AND METHODS: PSP was administered intragastrically to the rats. After 35 days, the total body bone mineral density (BMD) was assessed in all of the rats. All sections were processed for immunohistochemistry and hematoxylin-eosin staining (H.E.). RESULTS: BMD was lower in the ovariectomized group (OVX, 0.163 g/cm(2)), the group that received a moderate dose of PSP on OVX animals (OVX+MP, 0.163 g/cm(2)) and the group that received a low dose of PSP on OVX animals (OVX+LP, 0.162 g/cm(2)) than in the sham-operated group (SHAM, 0.180 g/cm(2)), the OVX+E(2) group (OVX+E(2), 0.176 g/cm(2)) and the group that received a high dose of PSP on OVX animals (OVX+HP, 0.174 g/cm(2)) (P<0.05). Clear arrangements of bone trabeculae were observed in the OVX+E(2) and OVX+HP. The expression of bone morphogenetic proteins (BMP) and basic fibroblast growth factor (bFGF) in the OVX, OVX+MP and OVX+LP was down regulated compared to the SHAM, OVX+E(2) and OVX+HP (P<0.05). The rats in the OVX+E(2) and OVX+HP had lower levels of bone Gla protein (BGP), bone alkaline phosphatase (BALP), tartrate-resistant acid phosphatase (TRAP) and tumor necrosis factor α(TNF-α) expression than the rats in the OVX, OVX+MP and OVX+LP (P<0.05). CONCLUSION: This experiment demonstrates that the administration of PSP to ovariectomized rats reverses bone loss and prevents osteoporosis.
Assuntos
Conservadores da Densidade Óssea/uso terapêutico , Densidade Óssea/efeitos dos fármacos , Reabsorção Óssea/prevenção & controle , Osso e Ossos/efeitos dos fármacos , Fitoterapia , Polygonatum/química , Polissacarídeos/uso terapêutico , Fosfatase Ácida/metabolismo , Fosfatase Alcalina/metabolismo , Animais , Conservadores da Densidade Óssea/farmacologia , Proteínas Morfogenéticas Ósseas/metabolismo , Reabsorção Óssea/etiologia , Reabsorção Óssea/metabolismo , Osso e Ossos/metabolismo , Osso e Ossos/patologia , Regulação para Baixo , Feminino , Fator 2 de Crescimento de Fibroblastos/metabolismo , Isoenzimas/metabolismo , Osteocalcina/metabolismo , Ovariectomia , Extratos Vegetais/administração & dosagem , Extratos Vegetais/farmacologia , Extratos Vegetais/uso terapêutico , Polissacarídeos/administração & dosagem , Polissacarídeos/farmacologia , Ratos , Ratos Sprague-Dawley , Fosfatase Ácida Resistente a Tartarato , Fator de Necrose Tumoral alfa/metabolismoRESUMO
The inhibitory effect of different reperfusion periods 45 min following hepatic ischemia on the expression of cholecystokinin (CCK) and vasoactive intestinal peptide (VIP) in the jejunum and the effect of salvia miltiorrhiza pretreatment were investigated, and the possible mechanism and implications were explored. Eighty rats were randomly divided into four groups: normal control group (CO group), sham-operated group (SO group), ischemia/reperfusion (I/R) injury group (IR group) and salvia miltiorrhiza pretreatment group (SM group). The rat model of I/R was established by using a non-invasive artery clamp to clip (45 min) or relax the hepatic pedicle. In the SM group, saline (40 mL/kg) and salvia miltiorrhiza injection (6 g/kg) were injected via the tail vein 30 min before clipping the hepatic pedicle. In the SO group only the porta hepatis was dissected after laparotomy without clamping the hepatic pedicle. At 0, 3, 12, 24 and 72 h post-reperfusion, respectively, upper jejunum samples were taken for immunohistochemistry of CCK and VIP. It was found that 0 h after I/R, the expression of CCK and VIP in the upper jejunum was upregulated. With prolongation of the reperfusion period, the expression of CCK and VIP was also increased, reached the peak at the 24th h, and gradually returned to the normal level at the 72nd h after reperfusion. The levels of both CCK and VIP in the SM group were lower than those in the IR group. It is suggested that the digestive tract congestion injury caused by liver ischemia can upregulate the expression of CCK and VIP in the jejunum following reperfusion. Salviae pretreatment can partly reduce the increased expression of CCK and VIP in the jejunum in the same period, which might contribute to the early recovery of gastrointestinal motility.
Assuntos
Colecistocinina/biossíntese , Motilidade Gastrointestinal/efeitos dos fármacos , Hepatopatias/tratamento farmacológico , Fitoterapia , Traumatismo por Reperfusão/tratamento farmacológico , Salvia miltiorrhiza , Peptídeo Intestinal Vasoativo/biossíntese , Animais , Motilidade Gastrointestinal/fisiologia , Mucosa Intestinal/efeitos dos fármacos , Mucosa Intestinal/metabolismo , Mucosa Intestinal/fisiopatologia , Jejuno/efeitos dos fármacos , Jejuno/metabolismo , Jejuno/fisiopatologia , Fígado/metabolismo , Fígado/fisiopatologia , Hepatopatias/metabolismo , Hepatopatias/fisiopatologia , Ratos , Ratos Sprague-Dawley , Traumatismo por Reperfusão/metabolismo , Traumatismo por Reperfusão/fisiopatologiaRESUMO
Pollen mother cells (PMCs) represent a critical early stage in plant sexual reproduction in which the stage is set for male gamete formation. Understanding the global molecular genetics of this early meiotic stage has so far been limited to whole stamen or floret transcriptome studies, but since PMCs are a discrete population of cells in developmental synchrony, they provide the potential for precise transcriptome analysis and for enhancing our understanding of the transition to meiosis. As a step toward identifying the premeiotic transcriptome, we performed microarray analysis on a homogenous population of rice (Oryza sativa) PMCs isolated by laser microdissection and compared them with those of tricellular pollen and seedling. Known meiotic genes, including OsSPO11-1, PAIR1, PAIR2, PAIR3, OsDMC1, OsMEL1, OsRAD21-4, OsSDS, and ZEP1, all showed preferential expression in PMCs. The Kyoto Encyclopedia of Genes and Genomes pathways significantly enriched in PMC-preferential genes are DNA replication and repair pathways. Our genome-wide survey showed that, in the buildup to meiosis, PMCs accumulate the molecular machinery for meiosis at the mRNA level. We identified 1,158 PMC-preferential genes and suggested candidate genes and pathways involved in meiotic recombination and meiotic cell cycle control. Regarding the developmental context for meiosis, the DEF-like, AGL2-like, and AGL6-like subclades of MADS box transcription factors are PMC-preferentially expressed, the trans-zeatin type of cytokinin might be preferentially synthesized, and the gibberellin signaling pathway is likely active in PMCs. The ubiquitin-mediated proteolysis pathway is enriched in the 127 genes that are expressed in PMCs but not in tricellular pollen or seedling.
Assuntos
Perfilação da Expressão Gênica , Genes de Plantas , Meiose/genética , Oryza/genética , Pólen , Reparo do DNA , Replicação do DNA , Lasers , Análise de Sequência com Séries de Oligonucleotídeos , Oryza/citologia , Oryza/fisiologia , Transdução de SinaisRESUMO
BACKGROUND: Cultivation of medicinal plants is not only a means for meeting current and future demands for large volume production of plant-based drug and herbal remedies, but also a means of relieving harvest pressure on wild populations. Scutellaria baicalensis Georgi (Huang-qin or Chinese skullcap) is a very important medicinal plant in China. Over the past several decades, wild resource of this species has suffered rapid declines and large-scale cultivation was initiated to meet the increasing demand for its root. However, the genetic impacts of recent cultivation on S. baicalensis have never been evaluated. In this study, the genetic diversity and genetic structure of 28 wild and 22 cultivated populations were estimated using three polymorphic chloroplast fragments. The objectives of this study are to provide baseline data for preserving genetic resource of S. baicalensis and to evaluate the genetic impacts of recent cultivation on medicinal plants, which may be instructive to future cultivation projects of traditional Chinese medicinal plants. RESULTS: Thirty-two haplotypes of S. baicalensis (HapA-Y and Hap1-7) were identified when three chloroplast spacers were combined. These haplotypes constituted a shallow gene tree without obvious clusters for cultivated populations, suggesting multiple origins of cultivated S. baicalensis. Cultivated populations (hT = 0.832) maintained comparable genetic variation with wild populations (hT = 0.888), indicating a slight genetic bottleneck due to multiple origins of cultivation. However, a substantial amount of rare alleles (10 out of 25 haplotypes within wild populations) lost during the course of S. baicalensis cultivation. The genetic differentiation for cultivated group (GST = 0.220) was significantly lower than that of wild group (GST = 0.701). Isolation by distance analysis showed that the effect of geographical isolation on genetic structure was significant in wild populations (r = 0.4346, P < 0.0010), but not in cultivated populations (r = 0.0599, P = 0.2710). These genetic distribution patterns suggest that a transient cultivation history and the extensive seed change among different geographical areas during the course of S. baicalensis cultivation. CONCLUSIONS: Although cultivated S. baicalensis maintains comparable genetic diversity relative to wild populations, recent cultivation has still imposed profound impacts on genetic diversity patterns of the cultivated S. baicalensis populations, i.e., the loss of rare alleles and homogenization of cultivated populations. This study suggests that conservation-by-cultivation is an effective means for protecting genetic resources of S. baicalensis, however, the wild resources still need to be protected in situ and the evolutionary consequences of extensive seed exchange mediated by human being should be monitored carefully.
Assuntos
Agricultura/métodos , Medicamentos de Ervas Chinesas/química , Plantas Medicinais/genética , Scutellaria baicalensis/genética , DNA de Plantas , Variação GenéticaRESUMO
OBJECTIVE: To investigate the effects and possible mechanism of rifampicin on steroid-induced osteonecrosis of the femoral head (ONFH). METHODS: Bone marrow stromal cells (BMSC) separated from male rats were cultured in vitro without any treatment (Group mA), exposed to dexamethasone (Group mB), treated with rifampicin (Group mC), and exposed to dexamethasone and rifampicin simultaneously (Group mD) respectively (n = 5 in each group). After 7 days, P-glycoprotein (P-gp) activity and adipogenesis of the BMSC were evaluated. In an in vivo experiment, 80 rats were randomly divided into 4 groups (n= 20 in each group). Group A received intragastric saline for 5 weeks. Group B received intragastric saline for one week, followed by subcutaneous methylprednisolone and saline for 4 weeks. Group C received intragastric rifampicin for 5 weeks. Group D received intragastric rifampicin for one week, followed by subcutaneous methylprednisolone and rifampicin for 4 weeks. At the end of the experiment, all rats underwent analysis of P-gp activity of BMSC, P-gp expression in the femoral heads, MRI and histomorphometry of the femoral heads. RESULTS: In vitro, the P-gp activity of BMSC increased and lipid accumulation decreased significantly in Group mD, compared to Group mB. In vivo, P-gp activity and P-gp expression in Group D increased compared to Group B. The mean area of MRI abnormal signal, adipocytic variables and apoptotic cells in Group D decreased, mean percentage of the whole epiphysis made up by the epiphyseal ossification center and trabecular structure variables improved compared to those in Group B. The incidence of ONFH was lower in Group D (50%) than in Group B (80%). CONCLUSION: Rifampicin may decrease the risk of steroid-induced ONFH by enhancing P-gp activity, thus preventing steroid-induced BMSC adipogenesis.
Assuntos
Necrose da Cabeça do Fêmur/prevenção & controle , Glucocorticoides/antagonistas & inibidores , Rifampina/uso terapêutico , Membro 1 da Subfamília B de Cassetes de Ligação de ATP/metabolismo , Adipogenia/efeitos dos fármacos , Animais , Células da Medula Óssea/efeitos dos fármacos , Células da Medula Óssea/metabolismo , Células Cultivadas , Dexametasona/antagonistas & inibidores , Dexametasona/farmacologia , Modelos Animais de Doenças , Avaliação Pré-Clínica de Medicamentos/métodos , Cabeça do Fêmur/metabolismo , Cabeça do Fêmur/patologia , Necrose da Cabeça do Fêmur/induzido quimicamente , Necrose da Cabeça do Fêmur/metabolismo , Necrose da Cabeça do Fêmur/patologia , Glucocorticoides/farmacologia , Glucocorticoides/toxicidade , Imageamento por Ressonância Magnética/métodos , Masculino , Metilprednisolona/antagonistas & inibidores , Metilprednisolona/toxicidade , Ratos , Ratos Sprague-Dawley , Rifampina/farmacologia , Risco , Células Estromais/efeitos dos fármacos , Células Estromais/metabolismoRESUMO
Pytoremediaton of arsenic (As) contamination using Chinese brake fern (Pteris vittata L.), an As hyperaccumulator has proven potential because of its cost-effectiveness and environmental harmonies. Aiming to investigate the elemental correlation in Chinese brake fern, 20 elements (As, Br, Ca, Ce, Co, Cr, Eu, Fe, Hf, La, Na, Nd, K, Rb, Se, Sm, Sr, Th, Yb and Zn) were measured in the fronds and roots of the fern by neutron activation analysis. The ferns were sampled from two sites with high geogenic As levels: Zimudang (ZMD) and Lanmuchang (LMC) in Guizhou Province, China. Multivariate statistic analysis was performed to explore the interrelationship between these elements, especially between As and other elements. As was found to be positively related to K, Na, La, and Sm in both the roots and the fronds, suggesting that these four elements might operate as synergies to As during uptake and transportation processes. Se was positively related to most of the other cations measured, except in the fronds of the fern at ZMD, where Br replaced Se as positively related to the other cations. The difference of As and Se in correlation with other cationic elements suggested that the two anionic elements play different roles in elemental uptake processes. Our findings of elemental correlation highlight the importance of the anion- cation balance in Chinese brake fern.