Function and characterization of the promoter region of perilipin 1 (PLIN1): Roles of E2F1, PLAG1, C/EBPβ, and SMAD3 in bovine adipocytes
| Autor: | Mei Chugang, Zhao Chunping, Rajwali Khan, Cheng Gong, Sayed Haidar Abbas Raza, Zan Lin-sen, Li Shijun, Nurgulsim Kaster, Hong Jieyun, Nicola M. Schreurs |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Perilipin-1 Adipose tissue Biology 01 natural sciences 03 medical and health sciences Sequence Analysis Protein Lipid droplet Adipocytes Genetics Transcriptional regulation Animals E2F1 Smad3 Protein Promoter Regions Genetic Transcription factor Cells Cultured Phylogeny 030304 developmental biology 0303 health sciences Adipogenesis Binding Sites CCAAT-Enhancer-Binding Protein-beta Lipid metabolism Promoter Sequence Analysis DNA Lipid Metabolism Cell biology DNA-Binding Proteins Gene Expression Regulation Cattle Sequence Alignment E2F1 Transcription Factor Transcription Factors 010606 plant biology & botany |
| Zdroj: | Genomics. 112:2400-2409 |
| ISSN: | 0888-7543 |
| Popis: | Perilipin 1 (PLIN1) protein, also known as lipid droplet-associated protein, is encoded by the PLIN1 gene and is able to anchor itself to the membranes of lipid droplets. The phosphorylation of PLIN1 is critical for the mobilization of fat in adipose tissue and plays an important role in regulating lipolysis and lipid storage in adipocytes. However, research on the synthesis and lipid metabolism of lipid droplets by PLIN1 in bovine adipocytes is limited. In the present study, we found that bovine PLIN1 was highly expressed in subcutaneous adipose tissue. The highest level of PLIN1 mRNA expression in bovine adipocytes was observed on day 6 of differentiation. Moreover, the cytoplasmic subcellular localization of PLIN1 was observed in bovine preadipocytes. To elucidate the molecular mechanism of bovine PLIN1 transcriptional regulation, we cloned eight fragments containing the 5′ regulatory region of the PLIN1 gene. The results showed that the −209/−17 bp region of the bovine PLIN1 gene was the core promoter region. Based on the transcriptional activities of the promoter vector fragments, the luciferase activity of the mutated fragment, the siRNA interference, and the results of the electrophoretic mobility shift assay (EMSA), we identified the binding sites of E2F transcription factor 1 ( E2F1), pleiomorphic adenoma gene 1 (PLAG1 ), CCAAT enhancer binding protein beta ( C/EBPβ ), and SMAD family member 3 ( SMAD3 ) as the transcriptional activators or repressors of the core promoter region. Further experiments confirmed that the knockdown of the PLIN1 gene affected the ability of these transcription factors to regulate the lipid metabolism in bovine adipocytes. In conclusion, our results reveal a potential mechanism for the transcriptional regulation of PLIN1 in bovine adipocytes. |
| Databáze: | OpenAIRE |
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