Abstract
Adipogenic differentiation is a highly regulated process that is necessary for metabolic homeostasis and nutrient sensing. The expression of PPARγ and the subsequent activation of adipogenic genes is critical for the process. In this study, we identified lanthionine synthetase C-like protein 2 (LanCL2) as a positive regulator of adipogenesis in 3T3-L1 cells. Knockdown of LanCL2, but not LanCL1, inhibited adipogenic differentiation, and this effect was not mediated through cAMP or Akt signaling pathways. The expression of early adipogenic markers CCAAT enhancer binding protein β (C/EBPβ) and C/EBPδ remained intact in LanCL2 knockdown cells, but levels of late adipogenic markers PPARγ and C/EBPα were suppressed. The addition of the naturally occurring PPARγ activator 15-deoxy-Δ12,14-prostaglandin J2 or conditioned medium from differentiating cells did not restore differentiation, implying that LanCL2 may not be involved in the production of a secreted endogenous PPARγ ligand. Pulldown assays demonstrated a direct physical interaction between LanCL2 and PPARγ. Consistent with a regulatory role of LanCL2, luciferase reporter assays revealed that full transcriptional activation by PPARγ was dependent on LanCL2. Taken together, our study reveals a novel role of LanCL2 in adipogenesis, specifically involved in PPARγ-mediated transactivation of downstream adipogenic genes.
Highlights
Adipogenic differentiation is a highly regulated process that is necessary for metabolic homeostasis and nutrient sensing
To explore any potential function of lanthionine synthetase C-like protein 2 (LanCL2) in adipogenic differentiation, we knocked it down using lentiviral transduction of two different shRNAs directed against mouse LanCL2
Overexpression of LanCL2 in 3T3-L1 cells (Fig. 1H) did not increase the differentiation potential of these cells further (Fig. 1I, J), suggesting that endogenous levels of LanCL2 may be sufficient for mediating full differentiation of these cells to adipocytes
Summary
Adipogenic differentiation is a highly regulated process that is necessary for metabolic homeostasis and nutrient sensing. Our study reveals a novel role of LanCL2 in adipogenesis, involved in PPAR -mediated transactivation of downstream adipogenic genes.—Dutta, D., K-Y. Supplementary key words adipocytes peroxisome proliferator activated receptor 3T3-L1 depot for the storage of lipids and as an endocrine organ mediating the secretion of a variety of cytokines such as leptin, adiponectin, and TNF- [1]. For the in vitro study of adipogenesis, 3T3-L1 preadipocytes are the most widely used and best-characterized cell culture model to date [3, 4] Studies in these cells have revealed the highly complex nature of adipocyte development and outlined the role of several transcription factors important in the process.
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