| First Author | Caglayan E | Year | 2019 |
| Journal | Respir Res | Volume | 20 |
| Issue | 1 | Pages | 42 |
| PubMed ID | 30813929 | Mgi Jnum | J:291553 |
| Mgi Id | MGI:6444926 | Doi | 10.1186/s12931-019-1003-4 |
| Citation | Caglayan E, et al. (2019) Pulmonary arterial remodelling by deficiency of peroxisome proliferator-activated receptor-gamma in murine vascular smooth muscle cells occurs independently of obesity-related pulmonary hypertension. Respir Res 20(1):42 |
| abstractText | BACKGROUND: Obesity is associated with cardiovascular complications, including pulmonary hypertension (PH). Reports suggest that peroxisome proliferator-activated receptor-gamma (PPARgamma) has direct action in preventing vascular remodelling in PH. Here we dissected the specific role of high-fat-diet (HFD)-induced obesity and vascular smooth muscle cell (VSMC)-PPARgamma for remodelling of small pulmonary arteries. METHODS: Wild-type (WT) and VSMC-specific PPARgamma-knockout (SmPpargamma(-/-)) mice were fed a low-fat-diet (LFD, 10% kcal from fat) or HFD (60% kcal from fat) for 24 weeks. Mice were metabolically phenotyped (e.g. weight development, insulin/glucose tolerance) at the beginning, and after 12 and 24 weeks, respectively. At 24 weeks additionally pulmonary pressure, heart structure, pulmonary vascular muscularization together with gene and protein expression in heart and lung tissues were determined. RESULTS: HFD increased right ventricular systolic pressure (RVSP) to a similar extent in WT and SmPpargamma(-/-) mice. HFD decreased glucose tolerance and insulin sensitivity in both WT and SmPpargamma(-/-) mice. Importantly, the increase in RVSP correlated with the degree of insulin resistance. However, VSMC-PPARgamma deficiency increased pulmonary vascular muscularization independently of the diet-induced rise in RVSP. This increase was associated with elevated expression of early growth response protein 1 in heart and osteopontin in lung tissue. CONCLUSIONS: Here we demonstrate a correlation of insulin resistance and pulmonary pressure. Further, deficiency of PPARgamma in VSMCs diet-independently leads to increased pulmonary vascular muscularization. |
