Objectives

The white adipose tissue (WAT) expansion plays a significant role in the development of obesity. Cytoskeletal remodeling directly impacts adipogenic program, however, the precise mechanism remains poorly understood. Here, we identified a crucial role of Septin-7 (SEPT7), a cytoskeleton component, in the regulation of diet-induced processes of adipogenesis, lipogenesis, and lipolysis in WAT.

Methods

A high-fat diet (HFD)-induced obesity model was constructed using mice with inducible adipocyte-specific SEPT7 deficiency. The impact of SEPT7 on adipocyte morphology, cell number and metabolism capacity were evaluated with immunofluorescence, isoproterenol induced lipolysis assay, glucose tolerance test and insulin tolerance test. Adipocyte mTmG reporter line was established to trace in vivo adipogenesis. The preadipocyte 3T3-L1 cell was induced for exploring role of SEPT7 in adipocyte differentiation. qRT-PCR and Western-blot were used to investigate the expression of PPARγ, C/EBPα, and HSL in 3T3-L1 cell with siRNA-mediated SEPT7 knockdown.

Results

SEPT7 expression was greatly induced in obesogenic human and murine adipocytes. Mice lacking SEPT7 in mature white adipocytes demonstrated defective differentiation of preadipocyte into mature adipocytes when fed HFD resulting in larger adipocytes, increased WAT inflammation and reduced lipolysis, which leading to increased WAT mass, liver fat accumulation and impaired glucose tolerance. Mechanistically, we identified SEPT7 restrains store-operated Ca²⁺ entry (SOCE) and regulates adipocyte adipogenesis and lipolysis by targeting PPARγ, C/EBPα and HSL.

Conclusions

We demonstrated that SEPT7 negatively regulates adipogenesis while promotes lipolysis and its repression drives WAT expansion and impaired metabolic health.