| First Author | Feng D | Year | 2011 |
| Journal | Diabetes | Volume | 60 |
| Issue | 8 | Pages | 2134-43 |
| PubMed ID | 21734017 | Mgi Jnum | J:186800 |
| Mgi Id | MGI:5433259 | Doi | 10.2337/db10-1411 |
| Citation | Feng D, et al. (2011) High-fat diet-induced adipocyte cell death occurs through a cyclophilin D intrinsic signaling pathway independent of adipose tissue inflammation. Diabetes 60(8):2134-43 |
| abstractText | OBJECTIVE: Previous studies have demonstrated that mice fed a high-fat diet (HFD) develop insulin resistance with proinflammatory macrophage infiltration into white adipose tissue. Concomitantly, adipocytes undergo programmed cell death with the loss of the adipocyte-specific lipid droplet protein perilipin, and the dead/dying adipocytes are surrounded by macrophages that are organized into crown-like structures. This study investigated whether adipocyte cell death provides the driving signal for macrophage inflammation or if inflammation induces adipocyte cell death. RESEARCH DESIGN AND METHODS: Two knockout mouse models were used: granulocyte/monocyte-colony stimulating factor (GM-CSF)-null mice that are protected against HFD-induced adipose tissue inflammation and cyclophilin D (CyP-D)-null mice that are protected against adipocyte cell death. Mice were fed for 4-14 weeks with a 60% HFD, and different markers of cell death and inflammation were analyzed. RESULTS: HFD induced a normal extent of adipocyte cell death in GM-CSF-null mice, despite a marked reduction in adipose tissue inflammation. Similarly, depletion of macrophages by clodronate treatment prevented HFD-induced adipose tissue inflammation without any affect on adipocyte cell death. However, CyP-D deficiency strongly protected adipocytes from HFD-induced cell death, without affecting adipose tissue inflammation. CONCLUSIONS: These data demonstrate that HFD-induced adipocyte cell death is an intrinsic cellular response that is CyP-D dependent but is independent of macrophage infiltration/activation. |
