Project description:RNA sequencing was performed to obtain a landscape of mRNA, circRNA, lncRNA, and miRNA of bovine intramuscular adipocytes in 4 differentiation periods.
Project description:Bovine preadipocytes were isolated from subcutaneous fatty tissue and induced differentiation into adipocytes and RNAs were extracted from preadipocytes and adipocytes respectively. Small RNA-seq was performed by Beijing Genomics Institute biotechnology. A total of 250 differential expression miRNAs were screened, while 131 miRNAs were highly expressed in bovine adipocytes and 119 miRNAs were highly expressed in bovine preadipocytes. KEGG pathway analysis presented that 4.76% (p-value<0.001) differently expression genes enriched in lipid metabolism. GO analysis showed the target genes were mainly associated with cell process, cell and binding. Together these results provided important insights into the research of miRNAs for bovine preadipocytes differentiation.
Project description:Adipocytes are dynamic cells that have critical functions to maintain body energy homeostasis. Function of adipocyte is affected by adipogenic differentiation, and exogenous stimulation of biochemical factors such as serotonin and TNF-. Serotonin (5-hydroxytriptamine, 5-HT) is a biogenic monoamine, which known to be involved in lipid metabolism in adipocytes. The TNF- is a proinflammatory cytokines involved in adipocyte biology. Here we investigated the global transcriptome alterations of porcine intramuscular adipocytes at undifferentiated preadipocyte, differentiated adipocytes state, and adipocytes after stimulation with serotonin and TNF- for 12 h by using Agilent’s Porcine (V2) one-color Gene Expression Microarray 4 × 44. Transcriptome analysis revealed that the expression of 443, 261, and 249 genes were altered after differentiation, and after serotonin and TNF- stimulation, respectively. Differentiation process of adipocytes are found to be involved with expression changes of APP, HNF4A, ESR1, EGR1, SRC, HNF1A, FN1, ALB, STAT3, CBL, CEBPB, AR, FOS, CFTR, PAN2, PTPN6, VDR, PPARG, STAT5A and NCOA3 genes which are enriched in the ‘PPAR signaling pathway’ and ‘insulin resistance pathway’. Dose-dependent serotonin stimulation resulted in a decreased fat accumulation in the adipocytes as well as decreased adipocyte proliferation. Serotonin-induced differentially expressed genes in adipocytes were participated in the significant enrichment of GPCR ligand-binding, Cell chemotaxis, blood coagulation and complement pathways, metabolism of lipid and lipoproteins, regulation of lipid metabolism by PPARA; and lipid digestion, mobilization and transport pathways. TNF-α-induced transcriptional modification follows the similar trend, and alteration of many genes shared between both serotonin- and TNF-α stimulations. Our results provide new insights of transcriptome modifications associated with adipogenesis, and exogenous stimulation of serotonin- and TNF- to the porcine intramuscular adipocytes.
Project description:Purpose: In this study, RNA-Seq was performed on intramuscular adipocytes and subcutaneous adipocytes at 0, 2, 4, and 8 days of differentiation to find genes and miRNAs that regulate the differentiation of two types of adipocytes. Methods: High-throughput sequencing was performed with NovaSeq 6000, and 150 paired-end reads were generated.Clean reads were filtered using HISAT2. The StringTie was used to assemble the transcript and calculate fragments per kilobase million mapped reads (FPKM) value. Results: We found 30 genes that mainly regulate the differentiation of subcutaneous adipocytes and 22 genes that mainly regulate the differentiation of subcutaneous intramuscular adipocytes. A total of 17 important candidate differential miRNAs were found, of which 4 miRNAs are believed to play a regulatory role in both types of cells, and 10 and 3 act on lipid deposition in subcutaneous and intramuscular adipocytes, respectively.
Project description:Purpose: In this study, RNA-Seq was performed on intramuscular adipocytes and subcutaneous adipocytes at 0, 2, 4, and 8 days of differentiation to find genes and miRNAs that regulate the differentiation of two types of adipocytes. Method:The clean reads were mapped to the pig reference genome (scrofa. Sscrofa11.1) with perfect matches using Bowtie software. Annotated tRNA, rRNA, snoRNA, and snRNA sequences were filtered out, and conserved miRNAs were identified by the BLAST method against miRBase. The miRDeep2 software was used to predict new miRNAs based on the characteristics of the miRNA precursor hairpin structure. Differential expression analysis of two groups was performed using the DESeq2 R package. Differentially expressed miRNAs (DE-miRNAs) were screened with criterion of fold change > 1.5 and FDR < 0.05 using DESeq2. Target genes of DE-miRNAs were predicted by miRanda and targetscan. Results: We found 30 genes that mainly regulate the differentiation of subcutaneous adipocytes and 22 genes that mainly regulate the differentiation of subcutaneous intramuscular adipocytes. A total of 17 important candidate differential miRNAs were found, of which 4 miRNAs are believed to play a regulatory role in both types of cells, and 10 and 3 act on lipid deposition in subcutaneous and intramuscular adipocytes, respectively.
Project description:CPT1B, as the major rate-limiting enzyme for fatty acid β-oxidation, involved in the regulation of adipose tissue lipid deposition, but its role in the regulation of goat intramuscular fat (IMF) remains unclear. Here, we conducted knockdown experiments targeting the CPT1B gene in goat intramuscular preadipocytes, resulting in a significant increase in intracellular triglyceride (TAG) content and lipid droplet accumulation. Conversely, the overexpression of CPT1B led to a significant decrease in intracellular TAG content and lipid droplet accumulation. Mechanistically, through RNA-seq analysis of CPT1B knockdown samples, we identified 285 differentially expressed genes (DEGs), including 71 up-regulated and 214 down-regulated genes. Notably, these DEGs were significantly enriched in various KEGG signaling pathways, such as fatty acid metabolism, focal adhesion, FoxO signaling, PI3K-Akt signaling, and MAPK signaling pathways. Gene Set Enrichment Analysis (GSEA) further confirmed the upregulation of the MAPK signaling pathway upon CPT1B knockdown in adipocytes. In rescue experiments, we demonstrated that the addition of a p38MAPK inhibitor (PD169316) to CPT1B-knockdown adipocytes counteracted the increase in lipid deposition caused by the loss of CPT1B function. These findings suggest that CPT1B inhibits lipid deposition in goat intramuscular preadipocytes via the p38MAPK signaling pathway. In addition, we observed a potential interaction between CPT1B and CPT1A through Protein-Protein Interaction Networks (PPIs). Interestingly, CPT1A exhibited a similar regulatory function to CPT1B, and they both were able to partially restore the changes in lipid deposition induced by each other. This observation supports the hypothesis of synergistic effects between CPT1B and CPT1A. Collectively, our results elucidate the role of CPT1B in the regulation of lipid deposition in goat intramuscular adipocytes through the p38MAPK signaling pathway, providing valuable insights for enhancing the quality of goat intramuscular fat.
2023-08-03 | GSE239570 | GEO
Project description:Global studies of alternative polyadenylation in the differentiation of Bovine Subcutaneous and Intramuscular adipocytes
Project description:To investigate the function lncFABP4 in the regulation of adipogenic differentiation, we overexpressed lncFABP4 in buffalo intramuscular adipocytes
Project description:To find the differentially and highly expressed circRNAs between the early and late stages of intramuscular adipocytes differentiation. Explored their expression profiles and further predicted their possible interaction relationships. To generated the final circRNA-miRNA interaction network that have valuable functions in adipocyte differentiation.