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1.
Appl Environ Microbiol ; : e0107824, 2024 Aug 30.
Article in English | MEDLINE | ID: mdl-39212378

ABSTRACT

Plant-associated microbial communities play important roles in agricultural productivity, and their composition has been shown to vary across plant compartments and developmental stages. However, the response of microbial communities within different plant compartments and at different developmental stages to diverse long-term fertilization treatments, as well as their linkages with crop yields, remains underexplored. This study analyzed wheat-associated bacterial communities within various soil and plant compartments under three fertilization treatments throughout the vegetative and reproductive phases. The variance in bacterial community was primarily attributed to compartments, followed by fertilization treatments and developmental stages. The composition of belowground bacterial communities (bulk soil, rhizosphere soil, and root) exhibited stronger responses to fertilization treatments than aboveground compartments (stem and leaf). The composition of belowground bacterial communities responded to fertilization treatments at all developmental stages, and it was significantly correlated with crop yields during the vegetative phase, whereas the aboveground community composition only showed a response to fertilization during the reproductive phase, at which point it was significantly correlated with crop yields. Moreover, during this reproductive phase, the co-occurrence network of aboveground bacterial communities exhibited enhanced complexity, and it contained an increased number of keystone species associated with crop yields, such as Sphingomonas spp., Massilia spp., and Frigoribacterium spp. Structural equation modeling indicated that augmenting total phosphorus levels in aboveground compartments could enhance crop yields by increasing the relative abundance of these keystone species during the reproductive phase. These findings highlight the pivotal role of aboveground bacterial communities in wheat production during the reproductive phase. IMPORTANCE: The developmental stage significantly influences crop-associated bacterial communities, but the relative importance of bacterial communities in different compartments to crop yields across various stages is still not well understood. This study reveals that belowground bacterial communities during the vegetative phase are significantly correlated with crop yields. Notably, during the reproductive phase, the composition of aboveground bacterial communities was significantly correlated with crop yields. During this phase, the complexity and enriched keystone species within the aboveground co-occurrence network underscore their role in boosting crop production. These results provide a foundation for developing microbiome-based products that are phase-specific and promote sustainable agricultural practices.

2.
J Trop Pediatr ; 69(5)2023 09 07.
Article in English | MEDLINE | ID: mdl-37674390

ABSTRACT

Coronavirus disease 2019 (COVID-19) has become a significant global public health problem. Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), which causes the disease, utilizes angiotensin-converting enzyme II (ACE2) as a major functional receptor to enter host cells. No study has systematically assessed ACE2 expression in multiple tissues in children. This study investigated ACE2 expression and ACE2 protein's histological distribution in various organs in paediatric patients (the small intestine, thymus, heart and lungs). Our study revealed that ACE2 was highly expressed in enterocytes of the small intestine and widely expressed in the myocardium of heart tissues. The most notable finding was the positive staining of ACE2 in the Hassall's corpuscles epithelial cells. Negligible ACE2 expression in the lung tissues may contribute to a lower risk of infection and fewer symptoms of pneumonia in children than in adults with COVID-19 infection. These findings provide initial evidence for understanding SARS-CoV-2 pathogenesis and prevention strategies in paediatric clinical practice, which should be applicable for all children worldwide.


Subject(s)
COVID-19 , SARS-CoV-2 , Adult , Humans , Child , Angiotensin-Converting Enzyme 2/genetics , Heart , Public Health
3.
J Integr Plant Biol ; 65(10): 2368-2379, 2023 Oct.
Article in English | MEDLINE | ID: mdl-37655952

ABSTRACT

Soybean (Glycine max) produces seeds that are rich in unsaturated fatty acids and is an important oilseed crop worldwide. Seed oil content and composition largely determine the economic value of soybean. Due to natural genetic variation, seed oil content varies substantially across soybean cultivars. Although much progress has been made in elucidating the genetic trajectory underlying fatty acid metabolism and oil biosynthesis in plants, the causal genes for many quantitative trait loci (QTLs) regulating seed oil content in soybean remain to be revealed. In this study, we identified GmFATA1B as the gene underlying a QTL that regulates seed oil content and composition, as well as seed size in soybean. Nine extra amino acids in the conserved region of GmFATA1B impair its function as a fatty acyl-acyl carrier protein thioesterase, thereby affecting seed oil content and composition. Heterogeneously overexpressing the functional GmFATA1B allele in Arabidopsis thaliana increased both the total oil content and the oleic acid and linoleic acid contents of seeds. Our findings uncover a previously unknown locus underlying variation in seed oil content in soybean and lay the foundation for improving seed oil content and composition in soybean.


Subject(s)
Glycine max , Plant Proteins , Glycine max/genetics , Glycine max/metabolism , Plant Proteins/genetics , Plant Proteins/metabolism , Quantitative Trait Loci/genetics , Seeds/genetics , Seeds/metabolism , Plant Oils/metabolism
4.
J Am Chem Soc ; 144(21): 9458-9464, 2022 06 01.
Article in English | MEDLINE | ID: mdl-35594148

ABSTRACT

Precisely activating chemotherapeutic prodrugs in a tumor-selective manner is an ideal way to cure cancers without causing systemic toxicities. Although many efforts have been made, developing spatiotemporally controllable activation methods is still an unmet challenge. Here, we report a novel prodrug activation strategy using radiotherapy (X-ray). Due to its precision and deep tissue penetration, X-ray matches the need for altering molecules in tumors through water radiolysis. We first demonstrated that N-oxides can be effectively reduced by hydrated electrons (e-aq) generated from radiation both in tubes and living cells. A screening is performed to investigate the structure-reduction relationship and mechanism of the e-aq-mediated reductions. We then apply the strategy to activate N-oxide prodrugs. The anticancer drug camptothecin (CPT)-based N-oxide prodrug shows a remarkable anticancer effect upon activation by radiotherapy. This radiation-induced in vivo chemistry may enable versatile designs of radiotherapy-activated prodrugs, which are of remarkable clinical relevance, as over 50% of cancer patients take radiotherapy.


Subject(s)
Antineoplastic Agents , Neoplasms , Prodrugs , Antineoplastic Agents/chemistry , Antineoplastic Agents/pharmacology , Antineoplastic Agents/therapeutic use , Camptothecin/chemistry , Camptothecin/pharmacology , Camptothecin/therapeutic use , Humans , Neoplasms/drug therapy , Neoplasms/radiotherapy , Oxides , Prodrugs/chemistry
5.
Angew Chem Int Ed Engl ; 61(34): e202205014, 2022 08 22.
Article in English | MEDLINE | ID: mdl-35733240

ABSTRACT

Cleavage chemistry offers a new chance to activate chemotherapeutic prodrugs in a tumor-selective manner, yet developing spatiotemporally controllable cleavage chemistry with deep tissue penetration is still a great challenge. Herein, we present a novel radiotherapy-triggered cleavage chemistry that enables controlled drug release in tumors. Quaternary ammonium groups are identified as masking groups that can be efficiently removed by hydrated electrons (e-aq ) from water radiolysis. The subsequently released tertiary amines can be anti-cancer toxins or readily release functional molecules via 1,6-elimination. This radiotherapy-induced cleavage works successfully in living cells and tumor-bearing mice, showing remarkable treatment efficacy when the mice are given carfilzomib prodrug and radiotherapy. This strategy provides a new perspective for combinational radiochemotherapy, which is the first-line treatment for over 50 % of cancer patients.


Subject(s)
Ammonium Compounds , Neoplasms , Prodrugs , Animals , Drug Liberation , Mice , Neoplasms/drug therapy , Neoplasms/radiotherapy , Prodrugs/chemistry
6.
J Environ Manage ; 292: 112747, 2021 Aug 15.
Article in English | MEDLINE | ID: mdl-33965684

ABSTRACT

The global land area devoted to rubber plantations has now reached 13 million hectares, and the further expansion of these rubber plantations at the expense of tropical forests will have significant adverse effects on the ecological environment. Rubber-based agroforestry systems are considered a preferable approach for ameliorating the ecological environment. Many researchers have focused on the positive effects of rubber-based agroforestry systems on the ecological environment, while ignoring the risks involved in the establishment of rubber-based agroforestry systems. The present study investigated the effects of different-aged rubber-based agroforestry systems on the abundance and diversity of ground arthropods. It has been observed that the abundance and taxon richness of ground arthropods generally showed no difference when comparing young and mature rubber plantations. The rubber-based agroforestry systems significantly decreased the understory vegetation species, along with the abundance and taxon richness of ground arthropods compared to the same aged-rubber monoculture plantations. In addition, the change in the abundance and taxon richness of ground arthropods was greatly affected by the understory vegetation species and soil temperature. The abundance and taxon richness of ground arthropods decreased with the decrease in number of species of understory vegetation. The study results indicate that the establishment of rubber-based agroforestry systems have adversely affected the abundance and richness of ground arthropods to an extant greater than expected. Therefore, single, large rubber-based agroforestry systems are not recommended, and the intercropping of rubber and rubber-based agroforestry systems must be designed to promote the migration of ground arthropods between different systems.


Subject(s)
Arthropods , Animals , Biodiversity , Forests , Rubber , Soil
7.
Zhonghua Yi Xue Yi Chuan Xue Za Zhi ; 35(5): 683-685, 2018 Oct 10.
Article in Zh | MEDLINE | ID: mdl-30298495

ABSTRACT

OBJECTIVE: To detect potential mutation of TCOF1 gene in a Chinese family affected with Treacher-Collins syndrome. METHODS: Clinical data of the patient was collected. The analysis included history taking, clinical examination and genetic testing. All coding regions of the TCOF1 gene were subjected to PCR amplification and Sanger sequencing. RESULTS: A novel mutation c.2261ins G (p.E95X) of the TCOF1 gene was discovered in the patient. The same mutation was not found in his parents and 100 healthy controls. CONCLUSION: The c.2261insG (p.E95X) mutation of the TCOF1 gene probably underlies the disease in the patient. Genetic testing can facilitate diagnosis and genetic counseling for families affected with TCS.


Subject(s)
Mandibulofacial Dysostosis/genetics , Nuclear Proteins/genetics , Phosphoproteins/genetics , Asian People/genetics , Base Sequence , Humans , Infant, Newborn , Male , Molecular Sequence Data , Mutation
8.
J Sci Food Agric ; 97(10): 3333-3341, 2017 Aug.
Article in English | MEDLINE | ID: mdl-27981594

ABSTRACT

BACKGROUND: Straw return may improve soil quality and crop yields. In a 2-year field study, a straw return method (ditch-buried straw return, DB-SR) was used to investigate the soil quality and crop productivity effects on a wheat-corn rotation system. This study consisted of three treatments, each with three replicates: (1) mineral fertilisation alone (CK0); (2) mineral fertilisation + 7500 kg ha-1 wheat straw incorporated at depth of 0-15 cm (NPKWS); and (3) mineral fertilisation + 7500 kg ha-1 wheat straw ditch buried at 15-30 cm (NPKDW). RESULTS: NPKWS and NPKDW enhanced crop yield and improved soil biotical properties compared to mineral fertilisation alone. NPKDW contributed to greater crop yields and soil nutrient availability at 15-30 cm depths, compared to NPKWS treatment. NPKDW enhanced soil microbial activity and bacteria species richness and diversity in the 0-15 cm layer. NPKWS increased soil microbial biomass, bacteria species richness and diversity at 15-30 cm. CONCLUSIONS: The comparison of the CK0 and NPKWS treatments indicates that a straw ditch buried by digging to the depth of 15-30 cm can improve crop yields and soil quality in a wheat-maize rotation system. © 2016 Society of Chemical Industry.


Subject(s)
Crop Production/methods , Soil/chemistry , Triticum/growth & development , Zea mays/growth & development , Biomass , Carbon/analysis , Carbon/metabolism , Crop Production/instrumentation , Fertilizers/analysis , Nitrogen/analysis , Nitrogen/metabolism , Plant Stems/chemistry , Triticum/chemistry , Triticum/metabolism , Zea mays/chemistry , Zea mays/metabolism
9.
Environ Microbiol ; 18(12): 5137-5150, 2016 12.
Article in English | MEDLINE | ID: mdl-27581342

ABSTRACT

Organic matter application is a widely used practice to increase soil carbon content and maintain soil fertility. However, little is known about the effect of different types of organic matter, or the input of exogenous species from these materials, on soil fungal communities. In this study, fungal community composition was characterized from soils amended with three types of organic matter over a 30-year fertilization experiment. Chemical fertilization significantly changed soil fungal community composition and structure, which was exacerbated by the addition of organic matter, with the direction of change influenced by the type of organic matter used. The addition of organic matter significantly increased soil fungal richness, with the greatest richness achieved in soils amended with pig manure. Importantly, following addition of cow and pig manure, fungal taxa associated with these materials could be found in the soil, suggesting that these exogenous species can augment soil fungal composition. Moreover, the addition of organic matter decreased the relative abundance of potential pathogenic fungi. Overall, these results indicate that organic matter addition influences the composition and structure of soil fungal communities in predictable ways.


Subject(s)
Biodiversity , Fertilizers/analysis , Fungi/isolation & purification , Organic Chemicals/analysis , Soil Microbiology , Soil/chemistry , Animals , Cattle , Fungi/classification , Fungi/drug effects , Fungi/genetics , Manure/analysis , Organic Chemicals/pharmacology , Swine
10.
BMC Genomics ; 16: 232, 2015 Mar 24.
Article in English | MEDLINE | ID: mdl-25886904

ABSTRACT

BACKGROUND: For heterozygous genes, alleles on the chromatin from two different parents exhibit histone modification variations known as allele-specific histone modifications (ASHMs). The regulation of allele-specific gene expression (ASE) by ASHMs has been reported in animals. However, to date, the regulation of ASE by ASHM genes remains poorly understood in higher plants. RESULTS: We used chromatin immunoprecipitation followed by next-generation sequencing (ChIP-seq) to investigate the global ASHM profiles of trimethylation on histone H3 lysine 27 (H3K27me3) and histone H3 lysine 36 (H3K36me3) in two rice F1 hybrids. A total of 522 to 550 allele-specific H3K27me3 genes and 428 to 494 allele-specific H3K36me3 genes were detected in GL × 93-11 and GL × TQ, accounting for 11.09% and 26.13% of the total analyzed genes, respectively. The epialleles between parents were highly related to ASHMs. Further analysis indicated that 52.48% to 70.40% of the epialleles were faithfully inherited by the F1 hybrid and contributed to 33.18% to 46.55% of the ASHM genes. Importantly, 66.67% to 82.69% of monoallelic expression genes contained the H3K36me3 modification. Further studies demonstrated a significant positive correlation of ASE with allele-specific H3K36me3 but not with H3K27me3, indicating that ASHM-H3K36me3 primarily regulates ASE in this study. CONCLUSIONS: Our results demonstrate that epialleles from parents can be inherited by the F1 to produce ASHMs in the F1 hybrid. Our findings indicate that ASHM-H3K36me3, rather than H3K27me3, mainly regulates ASE in hybrid rice.


Subject(s)
Gene Expression Regulation, Plant , Histones/metabolism , Oryza/genetics , Protein Processing, Post-Translational , Alleles , Chimera/genetics , Epigenomics , Oryza/classification
11.
Plant Mol Biol ; 87(1-2): 17-30, 2015 Jan.
Article in English | MEDLINE | ID: mdl-25307286

ABSTRACT

Plant architecture directly affects biomass in higher plants, especially grain yields in agricultural crops. In this study, we characterized a recessive mutant, plant architecture determinant (pad), derived from the Oryza sativa ssp. indica cultivar MH86. The mutant exhibited severe dwarf phenotypes, including shorter and stunted leaves, fewer secondary branches during both the vegetative and reproductive growth stages. Cytological studies revealed that pad mutant growth defects are primarily due to the inhibition of cell expansion. The PAD gene was isolated using a map-based cloning strategy. It encodes a plasma membrane protein OsMCA1 and a SNP responsible for a single amino acid change was found in the mutant. PAD was universally expressed in rice tissues from the vegetative to reproductive growth stages, especially in seedlings, nodes and rachillae. Quantitative real-time PCR analysis revealed that the most of the genes responding to gibberellin (GA) metabolism were up-regulated in pad mutant internodes. The endogenous GA content measurement revealed that the levels of GA1 were significantly decreased in the third internode of pad mutants. Moreover, a GA response assay suggested that OsMCA1/PAD might be involved in the regulation of GA metabolism and signal transduction. Our results revealed the pad is a loss-of-function mutant of the OsMCA1/PAD, leading to upregulation of genes related to GA deactivation, which decreased bioactive GA levels.


Subject(s)
Genes, Plant , Gibberellins/metabolism , Oryza/genetics , Plant Proteins/genetics , Polymorphism, Single Nucleotide , Cloning, Molecular , Genetic Complementation Test , Phylogeny , Plant Roots/metabolism , Plant Stems/metabolism , Polymerase Chain Reaction
12.
BMC Plant Biol ; 15: 55, 2015 Feb 17.
Article in English | MEDLINE | ID: mdl-25848690

ABSTRACT

BACKGROUND: Sec18p/N-ethylmaleimide-sensitive factor (NSF) is a conserved eukaryotic ATPase, which primarily functions in vesicle membrane fusion from yeast to human. However, the function of the OsSec18 gene, a homologue of NSF in rice, remains unknown. RESULTS: In the present study, we investigated the function of OsSec18 in rice and found that OsSec18 complements the temperature-sensitive phenotype and interferes with vacuolar morphogenesis in yeast. Overexpression of OsSec18 in rice decreased the plant height and 1000-grain weight and altered the morphology of the protein bodies. Further examination revealed that OsSec18 presented as a 290-kDa complex in rice endosperm cells. Moreover, Os60sP0 was identified a component of this complex, demonstrating that the OsSec18 complex contains another complex of P0(P1-P2)2 in rice endosperm cells. Furthermore, we determined that the N-terminus of OsSec18 can interact with the N- and C-termini of Os60sP0, whereas the C-terminus of OsSec18 can only interact with the C-terminus of Os60sP0. CONCLUSION: Our results revealed that the OsSec18 regulates vacuolar morphology in both yeast and rice endosperm cell and the OsSec18 interacts with P0(P1-P2)2 complex in rice endosperm cell.


Subject(s)
Endosperm/cytology , Endosperm/metabolism , Multiprotein Complexes/metabolism , Oryza/metabolism , Plant Proteins/metabolism , Vacuoles/metabolism , Adenosine Triphosphatases , Endosperm/ultrastructure , Gene Expression Profiling , Gene Expression Regulation, Plant , Genetic Complementation Test , Membrane Fusion , Molecular Weight , Mutation/genetics , Organ Specificity/genetics , Oryza/cytology , Oryza/genetics , Phenotype , Plants, Genetically Modified , Protein Binding , Saccharomyces cerevisiae , Saccharomyces cerevisiae Proteins , Vacuoles/ultrastructure , Vesicular Transport Proteins
13.
BMC Genomics ; 15: 297, 2014 Apr 22.
Article in English | MEDLINE | ID: mdl-24755044

ABSTRACT

BACKGROUND: Sprague and Tatum (1942) introduced the concepts of general combining ability (GCA) and specific combining ability (SCA) to evaluate the breeding parents and F1 hybrid performance, respectively. Since then, the GCA was widely used in cross breeding for elite parent selection. However, the molecular basis of GCA remains to unknown. RESULTS: We studied the transcriptomes of three varieties and three F1 hybrids using RNA-Sequencing. Transcriptome sequence analysis revealed that the transcriptome profiles of the F1s were similar to the positive GCA-effect parent. Moreover, the expression levels of most differentially expressed genes (DEGs) were equal to the parent with a positive GCA effect. Analysis of the gene expression patterns of gibberellic acid (GA) and flowering time pathways that determine plant height and flowering time in rice validated the preferential transcriptome expression of the parents with positive GCA effect. Furthermore, H3K36me3 modification bias in the Pseudo-Response Regulators (PRR) gene family was observed in the positive GCA effect parents and demonstrated that the phenotype and transcriptome bias in the positive GCA effect parents have been epigenetically regulated by either global modification or specific signaling pathways in rice. CONCLUSIONS: The results revealed that the transcriptome profiles and DEGs in the F1s were highly related to phenotype bias to the positive GCA-effect parent. The transcriptome bias toward high GCA parents in F1 hybrids attributed to H3K36me3 modification both on global modification level and specific signaling pathways. Our results indicated the transcriptome profile and epigenetic modification level bias to high GCA parents could be the molecular basis of GCA.


Subject(s)
Genotype , Hybridization, Genetic , Oryza/genetics , Phenotype , Transcriptome , Epigenesis, Genetic , Flowers , Gene Expression Profiling , Gene Expression Regulation, Plant , Histones/metabolism , Metabolic Networks and Pathways , Oryza/metabolism , Quantitative Trait, Heritable , Signal Transduction
14.
Plant Cell Rep ; 33(4): 585-94, 2014 Apr.
Article in English | MEDLINE | ID: mdl-24413763

ABSTRACT

Plants provide a promising expression platform for producing recombinant proteins with several advantages in terms of high expression level, lower production cost, scalability, and safety and environment-friendly. Molecular pharming has been recognized as an emerging industry with strategic importance that could play an important role in economic development and healthcare in China. Here, this review represents the significant advances using transgenic rice endosperm as bioreactor to produce various therapeutic recombinant proteins in transgenic rice endosperm and large-scale production of OsrHSA, and discusses the challenges to develop molecular pharming as an emerging industry with strategic importance in China.


Subject(s)
Bioreactors , Endosperm/genetics , Molecular Farming/methods , Oryza/genetics , Plants, Genetically Modified , Recombinant Proteins/metabolism
15.
Urol Int ; 92(1): 104-15, 2014.
Article in English | MEDLINE | ID: mdl-24051497

ABSTRACT

INTRODUCTION: During bladder tumorigenesis, thymopoiesis is usually downregulated. Considering that the thymus is the site of most T-cell development, this phenomenon may be related to thymic involution. However, the mechanisms involved in this phenomenon remain to be elucidated. MATERIALS AND METHODS: An MB 49 murine bladder tumor model was used to identify mechanisms that might underlie this process. RESULTS: The thymuses of tumor-bearing mice showed less cellularity than those of healthy mice. Involution was found to be associated with less proliferation and more apoptosis of thymic epithelial cells (TEC). Foxn1, KGF, and IL-7, three factors known to be involved in thymic development, were also downregulated in the thymuses of tumor bearers. When these mice were intravenously injected with KGF, the thymic microenvironment, thymopoiesis, and T-cell differentiation all returned to near normal status. CONCLUSIONS: The decreases in thymopoiesis and impaired T-cell differentiation may be attributable to changes in the thymic microenvironment. Improving the function of TEC, rather than T-cell progenitors, should be the focus of therapy.


Subject(s)
Carcinoma, Transitional Cell/metabolism , Cellular Microenvironment , Signal Transduction , Thymus Gland/metabolism , Urinary Bladder Neoplasms/metabolism , Animals , Apoptosis , Atrophy , Carcinoma, Transitional Cell/immunology , Carcinoma, Transitional Cell/pathology , Cell Differentiation , Cell Line, Tumor , Cell Proliferation , Fibroblast Growth Factor 7/metabolism , Forkhead Transcription Factors/metabolism , Interleukin-7/metabolism , Male , Mice , Mice, Inbred C57BL , T-Lymphocytes/immunology , Thymus Gland/immunology , Thymus Gland/pathology , Time Factors , Urinary Bladder Neoplasms/immunology , Urinary Bladder Neoplasms/pathology
16.
Animals (Basel) ; 14(16)2024 Aug 06.
Article in English | MEDLINE | ID: mdl-39199823

ABSTRACT

The Qilu Lake is an eutrophic shallow lake located in Yunnan Province, China. An ecological fishery project was initiated in the lake from 2011 to 2021 to introduce filter-feeding fish species that feed on algae, with the aim of improving water quality. In January 2022, when the ecological fishery project expired, all fisheries-related activities (including fish stocking and fishing activities) ceased in the lake. To comprehensively evaluate the initial alterations in fish community structure and diversity resulting from the fishing cessation in the Qilu Lake, the present study conducted field surveys within the one year before the fishing cessation (referred to as BFC) and the one year after the fishing cessation (referred to as AFC). A total of twenty-one fish species were collected, including four native species. Four species were recorded in the lake for the first time, including Pelteobagrus fulvidraco, Pelteobagrus vachelli, Paramisgurnus dabryanus, and Hyporhamphus intermedius. The number of fish species decreased from 21 to 13 following the fishing cessation. The fishes collected in both BFC and AFC are mainly omnivorous-feeding and of bottom-dwelling habits. The mean size of the fishes in the AFC sample shows a significant decrease compared to those in BFC. After the fishing cessation, the Shannon-Wiener diversity index and Margalef richness index of the fish slightly declined. The fish community structure of the Qilu Lake exhibits a high degree of similarity to adjacent lakes in central Yunnan. Our study demonstrates a significant shift in the fish community of the Qilu Lake following the fishing cessation, one which may adversely impact the stability of the lake ecosystem. To enhance fish species diversity in the Qilu Lake, it is recommended that policies be implemented to promote the ecological fishery project and improve habitat restoration for native fish species, while also regulating fish community structure.

17.
J Control Release ; 366: 204-220, 2024 Feb.
Article in English | MEDLINE | ID: mdl-38109945

ABSTRACT

Metabolic heterogeneity and the tumor immunosuppressive microenvironment (TIME) of triple-negative breast cancer (TNBC) hinder therapeutic effectiveness. Although emerging metabolic therapy and immunotherapy show promise, they are limited by off-target effects and immune escape. Here, a redox-activatable, sequentially-releasing nanoparticle (AMANC@M) for tumor-targeted delivery of anticancer agents and CRISPR/Cas9 has been developed. AMANC@M can reverse the TIME through dual metabolic inhibition, thereby enhancing TNBC therapy. AMANC@M demonstrates excellent biosafety and targets tumors precisely through biomimetic hybrid membrane-mediated homologous homing and the enhanced permeability and retention (EPR) effect. Once internalized into tumor cells, the CRISPR/Cas9 system ("energy nanolock") is released through glutathione (GSH) cleavage and effectively knocks down the expression of lactate dehydrogenase A (LDHA) to suppress glycolysis. After peeling off of the gene editing shell, a newly synthesized targeted drug, CPI-Z2 ("nutrihijacker" and "energy nanolock"), is released in a controlled manner to block the mitochondrial tricarboxylic acid (TCA) cycle. Nitric oxide (NO) produced from loaded L-arginine enhances the efficiency of CPI-Z2 and reduces drug resistance. Combined with NO therapy, both blockades of nutrients and energy production transform the hypoxia and acidic TIME into an immunocompetent tumor microenvironment (TME) for tumor elimination. Furthermore, AMANC@M offers capabilities for photothermal (PT) therapy and provides clear imaging through PT, photoacoustic (PA), or computed tomography (CT) signals in tumor tissue. Thus, this study provides a new and promising sequentially stimuli-responsive targeting strategy for nanoparticle development, making it a potential treatment candidate for TNBC and other tumors.


Subject(s)
Antineoplastic Agents , Nanoparticles , Triple Negative Breast Neoplasms , Humans , Triple Negative Breast Neoplasms/drug therapy , Triple Negative Breast Neoplasms/metabolism , Delayed-Action Preparations/therapeutic use , Cell Line, Tumor , Tumor Microenvironment
18.
Sci Total Environ ; 912: 169059, 2024 Feb 20.
Article in English | MEDLINE | ID: mdl-38061650

ABSTRACT

Substrate depletion and microbial community thermal adaptation are major mechanisms that regulate the temperature sensitivity (Q10) of soil microbial respiration. Traditionally, the Q10 of soil microbial respiration is measured using laboratory incubation, which has limits in the continuous input of available substrates and the time scale for microbial community thermal adaptation. How the available substrate and the soil microbial community regulate the Q10 of soil microbial respiration under natural warming conditions remains unclear. To fill this gap in knowledge, a long-term field experiment was conducted consisting of two years of soil respiration observations combined with a soil available substrate and microbial community thermal adaptation analysis under seasonal warming conditions. The Q10 of soil respiration was calculated using the square root method, and it was more affected by the available substrate than by microbial community thermal adaptation. Fertilization management has a stronger effect on soil available substrate than temperature. As the temperature increased, NH4-N proved itself to be important for the bacterial community in the process of Q10 regulation, while dissolved organic carbon and nitrogen were key factors for the fungal community. Based on the niche breadth of microbial community composition, the changing Q10 of the soil respiration was not only closely associated with the specialist community, but also the generalist and neutralist communities. Furthermore, bacterial community thermal adaptation primarily occurred through shifts in the abundances of specialists and neutralists, while changes in species richness and species replacement occurred for the fungal generalists and neutralists. This work indicates that changing available nitrogen and DOC primarily caused by fertilization management contributed more in regulating the Q10 of soil microbial respiration than microbial community thermal adaptation, and there are different mechanisms for bacterial and fungal community thermal adaptation under warming.


Subject(s)
Microbiota , Soil , Temperature , Soil/chemistry , Soil Microbiology , Respiration , Bacteria , Nitrogen , Fertilization , Carbon
19.
Nat Biomed Eng ; 2024 Jul 18.
Article in English | MEDLINE | ID: mdl-39025943

ABSTRACT

Pt(II) drugs are a widely used chemotherapeutic, yet their side effects can be severe. Here we show that the radiation-induced reduction of Pt(IV) complexes to cytotoxic Pt(II) drugs is rapid, efficient and applicable in water, that it is mediated by hydrated electrons from water radiolysis and that the X-ray-induced release of Pt(II) drugs from an oxaliplatin prodrug in tumours inhibits their growth, as we show with nearly complete tumour regression in mice with subcutaneous human tumour xenografts. The combination of low-dose radiotherapy with a Pt(IV)-based antibody-trastuzumab conjugate led to the tumour-selective release of the chemotherapeutic in mice and to substantial therapeutic benefits. The radiation-induced local reduction of platinum prodrugs in the reductive tumour microenvironment may expand the utility of radiotherapy.

20.
IEEE J Biomed Health Inform ; 28(7): 4204-4215, 2024 Jul.
Article in English | MEDLINE | ID: mdl-38564357

ABSTRACT

OBJECTIVE: The clinical course of COVID-19, as well as the immunological reaction, is notable for its extreme variability. Identifying the main associated factors might help understand the disease progression and physiological status of COVID-19 patients. The dynamic changes of the antibody against Spike protein are crucial for understanding the immune response. This work explores a temporal attention (TA) mechanism of deep learning to predict COVID-19 disease severity, clinical outcomes, and Spike antibody levels by screening serological indicators over time. METHODS: We use feature selection techniques to filter feature subsets that are highly correlated with the target. The specific deep Long Short-Term Memory (LSTM) models are employed to capture the dynamic changes of disease severity, clinical outcome, and Spike antibody level. We also propose deep LSTMs with a TA mechanism to emphasize the later blood test records because later records often attract more attention from doctors. RESULTS: Risk factors highly correlated with COVID-19 are revealed. LSTM achieves the highest classification accuracy for disease severity prediction. Temporal Attention Long Short-Term Memory (TA-LSTM) achieves the best performance for clinical outcome prediction. For Spike antibody level prediction, LSTM achieves the best permanence. CONCLUSION: The experimental results demonstrate the effectiveness of the proposed models. The proposed models can provide a computer-aided medical diagnostics system by simply using time series of serological indicators.


Subject(s)
Antibodies, Viral , COVID-19 , Deep Learning , SARS-CoV-2 , Severity of Illness Index , Humans , COVID-19/diagnosis , COVID-19/blood , COVID-19/immunology , SARS-CoV-2/immunology , Antibodies, Viral/blood , Spike Glycoprotein, Coronavirus/immunology , Male
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