Secreted protein acidic and rich in cysteine (SPARC) regulates thermogenesis in white and brown adipocytes.

Sulagna Mukherjee, Min Ji Choi, Sang Woo Kim, Jong Won Yun

Molecular and cellular endocrinology 2020 Apr 15

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SPARC, also known as osteonectin, is well known for its physiological roles in bone formation and tissue remodeling, as well as in cancer pathology; however, evidence regarding its function in adipocytes is lacking. The present study explored the physiological role of SPARC in cultured 3T3-L1 white and HIB1B brown adipocytes of murine cell lines. Treatment of recombinant SPARC upregulated the fat browning marker proteins and genes in white adipocytes and activated brown adipocytes. Conversely, knockdown of Sparc markedly reduced these genes and proteins in both cell lines. In addition, recombinant SPARC inhibited expression of adipogenic and lipogenic proteins but elevated lipolytic and fatty acid oxidation proteins. Furthermore, in silico analysis revealed that SPARC directly interacted and regulated VEGF in adipocytes. In conclusion, SPARC acts as a regulatory protein in both white and brown adipocytes by controlling thermogenesis and is thus regarded as a possible therapeutic target for treatment of obesity. Copyright © 2020 Elsevier B.V. All rights reserved.

Citation

Sulagna Mukherjee, Min Ji Choi, Sang Woo Kim, Jong Won Yun. Secreted protein acidic and rich in cysteine (SPARC) regulates thermogenesis in white and brown adipocytes. Molecular and cellular endocrinology. 2020 Apr 15;506:110757