ArticleScientific reports2022
LPIN1 promotes triglycerides synthesis and is transcriptionally regulated by PPARG in buffalo mammary epithelial cells.
Article in Scientific reports, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.
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20 citing papers in PubMed, 29 citations in OpenAlex.
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- Sirtuin 1 Inhibits Fatty Acid Synthesis through Forkhead Box Protein O1-Mediated Adipose Triglyceride Lipase Expression in Goat Mammary Epithelial Cells.International journal of molecular sciences · 2024Article
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- The Role of Adipocyte Endoplasmic Reticulum Stress in Obese Adipose Tissue Dysfunction: A Review.International journal of general medicine · 2023Review
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Authors and funding
3 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Studies on 3T3-L1 cells and HepG2 hepatocytes have shown that phosphatidic acid phosphohydrolase1 (LPIN1) plays a key role in adipogenesis, acting as a co-activator of peroxisome proliferator-activated receptor gamma coactivator 1a (PGC-1a) to regulate fatty acid metabolism. However, the functional role and regulatory mechanism of LPIN1 gene in milk fat synthesis of buffalo are still unknown. In this study, overexpression of buffalo LPIN1 gene transfected with recombinant fusion expression vector significantly increased the expression of AGPAT6, DGAT1, DGAT2, GPAM and BTN1A1 genes involved in triglyceride (TAG) synthesis and secretion, as well as PPARG and SREBF1 genes regulating fatty acid metabolism in the buffalo mammary epithelial cells (BMECs), while the lentivirus-mediated knockdown of buffalo LPIN1 dramatically decreased the relative mRNA abundance of these genes. Correspondingly, total cellular TAG content in the BMECs increased significantly after LPIN1 overexpression, but decreased significantly after LPIN1 knockdown. In addition, the overexpression or knockdown of PPARG also enhanced or reduced the expression of LPIN1 and the transcriptional activity of its promoter. The core region of buffalo LPIN1 promoter spans from - 666 bp to + 42 bp, and two PPAR response elements (PPREs: PPRE1 and PPRE2) were identified in this region. Site mutagenesis analysis showed that PPARG directly regulated the transcription of buffalo LPIN1 by binding to the PPRE1 and PPRE2 on its core promoter. The results here reveal that the LPIN1 gene is involved in the milk fat synthesis of BMECs, and one of the important pathways is to participate in this process through direct transcriptional regulation of PPARG, which in turn significantly affects the content of TAG in BMECs.
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