4.7 Article

The Mechanism of Leptin on Inhibiting Fibrosis and Promoting Browning of White Fat by Reducing ITGA5 in Mice

Journal

Publisher

MDPI
DOI: 10.3390/ijms222212353

Keywords

adipocyte; leptin; ITGA5; fibrosis; white fat browning

Funding

  1. Major National Scientific Research Projects [2015CB943102]
  2. Shaanxi Province Key RD Program [2021NY-020]
  3. Qinghai Fundamental Scientific and Technological Research Plan [2018-ZJ-721]
  4. Natural Science Foundation of China [81860762]
  5. Scientific Research Guiding Plan Topic of Qinghai Hygiene Department [2018-wjzdx-131]

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Leptin regulates adipose tissue fibrosis and white fat browning by inhibiting ITGA5 expression, which can promote white fat metabolism and reduce fibrosis in adipose tissue.
Leptin is a small molecule protein secreted by adipocytes, which can promote white fat browning through activating the hypothalamic nervous system and inhibiting downstream signaling pathways. Moreover, white fat browning has been proven to alleviate fat tissue fibrosis. This study explores the mechanism of leptin in regulating adipose tissue fibrosis and white fat browning. After treating mice with leptin, we screened out the recombinant integrin alpha 5 (ITGA5) through proteomics sequencing, which may play a role in adipose tissue fibrosis. Through real-time quantitative PCR (qPCR), western blotting (WB), hematoxylin-eosin (HE) staining, Masson's trichrome, immunofluorescence, immunohistochemistry, etc., the results showed that after leptin treated adipocytes, the expression of fibrosis-related genes and ITGA5 was significantly down-regulated in adipocytes. We constructed fibrosis model through transforming growth factor-beta (TGF-beta) and a high-fat diet (HFD), and treated with ITGA5 overexpression vector and interference fragments. The results indicated the expression of fibrosis-related genes were significantly down-regulated after interfering with ITGA5. After treating adipocytes with wortmannin, fibrosis-related gene expression was inhibited after overexpression of ITGA5. Moreover, after injecting mice with leptin, we also found that leptin significantly up-regulated the expression of adipose tissue browning-related genes. Overall, our research shows that leptin can inhibit the activation of phosphatidylinositol 3 kinase (PI3K)-protein kinase B (AKT) signaling pathway by reducing the expression of ITGA5, which could alleviate adipose tissue fibrosis, and further promote white fat browning. Our research provides a theoretical basis for further research on the effect of leptin in fibrosis-related adipose tissue metabolism.

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