Drought is one of the major abiotic stresses that limit maize productivity. Apart from the principal transcriptional regulation, post-transcriptional regulation mediated by microRNAs appears to be the prevalent respon...Drought is one of the major abiotic stresses that limit maize productivity. Apart from the principal transcriptional regulation, post-transcriptional regulation mediated by microRNAs appears to be the prevalent response of plants to abiotic stress. In this study, the differential expression of microRNAs in the previously evaluated drought-tolerant inbred lines R09 under drought stress was detected by microarray hybridization. The target genes of the differentially-expressed microRNAs were predicted by bioinformatics software WMD3 for plant target gene prediction. The possible regulation of the differentially-expressed microRNAs as well as their target genes in maize response to drought stress was analysed according to Gene Ontology. Sixty-eight microRNAs in 29 microRNA families were detected to be differentially expressed in the seedling of the drought-tolerant inbred line R09, accounting for 5.97% of the total number of the probes. The expression profiles were different between the two time points of the drought stress. The functions of the genes targeted by the differentially-expressed microRNAs involve multiple physiological and biochemical pathways of response to abiotic stress, such as transcription regulation, metabolism, signal transduction, hormone stimulation, and transmembrane transport. Under drought stress, the differential expression of microRNAs regulates the expression of their target genes, resulting in multiple responses of physiological and biochemical pathways relative to drought tolerance of maize, miR156, miR159 and miR319 families may play more important roles. The different members of the same family may play similar regulation effects in most cases.展开更多
目的探讨小鼠间充质干细胞(MSCs)脂向分化过程中miRNA-143(miR-143)的表达,为阐明MSCs脂向分化的调控机制提供新线索。方法采用全骨髓体外分离结合差速贴壁法纯化扩增C57BL/6小鼠MSCs,将第5代MSCs采用脂肪细胞分化诱导剂进行成脂诱导。...目的探讨小鼠间充质干细胞(MSCs)脂向分化过程中miRNA-143(miR-143)的表达,为阐明MSCs脂向分化的调控机制提供新线索。方法采用全骨髓体外分离结合差速贴壁法纯化扩增C57BL/6小鼠MSCs,将第5代MSCs采用脂肪细胞分化诱导剂进行成脂诱导。运用miRNA芯片技术比较MSCs组和脂肪细胞组中miR-143的表达,并通过实时定量PCR技术验证。结果成功分离、纯化和培养MSCs;MSCs经脂肪诱导剂诱导后,胞内大量脂滴形成,油红O染色阳性。MiRNA芯片及实时定量PCR结果均表明miR-143在MSCs脂向分化过程中显著上调(3.73±0.42 vs 1.00±0.14,P<0.01)。结论 miR-143可能参与调控MSCs的脂向分化。展开更多
基金support by the National Basic Research Program of China(2009CB118400)the National Natural Science Foundation of China(30971795 and 31071433)
文摘Drought is one of the major abiotic stresses that limit maize productivity. Apart from the principal transcriptional regulation, post-transcriptional regulation mediated by microRNAs appears to be the prevalent response of plants to abiotic stress. In this study, the differential expression of microRNAs in the previously evaluated drought-tolerant inbred lines R09 under drought stress was detected by microarray hybridization. The target genes of the differentially-expressed microRNAs were predicted by bioinformatics software WMD3 for plant target gene prediction. The possible regulation of the differentially-expressed microRNAs as well as their target genes in maize response to drought stress was analysed according to Gene Ontology. Sixty-eight microRNAs in 29 microRNA families were detected to be differentially expressed in the seedling of the drought-tolerant inbred line R09, accounting for 5.97% of the total number of the probes. The expression profiles were different between the two time points of the drought stress. The functions of the genes targeted by the differentially-expressed microRNAs involve multiple physiological and biochemical pathways of response to abiotic stress, such as transcription regulation, metabolism, signal transduction, hormone stimulation, and transmembrane transport. Under drought stress, the differential expression of microRNAs regulates the expression of their target genes, resulting in multiple responses of physiological and biochemical pathways relative to drought tolerance of maize, miR156, miR159 and miR319 families may play more important roles. The different members of the same family may play similar regulation effects in most cases.
文摘目的探讨小鼠间充质干细胞(MSCs)脂向分化过程中miRNA-143(miR-143)的表达,为阐明MSCs脂向分化的调控机制提供新线索。方法采用全骨髓体外分离结合差速贴壁法纯化扩增C57BL/6小鼠MSCs,将第5代MSCs采用脂肪细胞分化诱导剂进行成脂诱导。运用miRNA芯片技术比较MSCs组和脂肪细胞组中miR-143的表达,并通过实时定量PCR技术验证。结果成功分离、纯化和培养MSCs;MSCs经脂肪诱导剂诱导后,胞内大量脂滴形成,油红O染色阳性。MiRNA芯片及实时定量PCR结果均表明miR-143在MSCs脂向分化过程中显著上调(3.73±0.42 vs 1.00±0.14,P<0.01)。结论 miR-143可能参与调控MSCs的脂向分化。
