1. Disruption of adipocyte HIF-1α improves atherosclerosis through the inhibition of ceramide generation
- Author
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Zhipeng Zhang, Pengcheng Wang, Changtao Jiang, Huiying Liu, X P Zhang, Yu Yan, Guangyi Zeng, Yongqiang Dong, Yangming Zhang, Yanli Pang, and Song-Yang Zhang
- Subjects
Ceramide ,medicine.medical_specialty ,Chemistry ,Cholesterol ,Adipose tissue ,medicine.disease ,High cholesterol ,chemistry.chemical_compound ,Endocrinology ,Internal medicine ,Adipocyte ,medicine ,General Pharmacology, Toxicology and Pharmaceutics ,Sphingomyelin ,Dyslipidemia ,Function (biology) - Abstract
s Atherosclerosis is a chronic multifactorial cardiovascular disease. A Western diet has been reported to affect atherosclerosis through regulation of adipose function. In high cholesterol diet-fed ApoE–/– mice, adipocyte HIF-1α deficiency or direct HIF-1α inhibition by the selective pharmacological HIF-1α inhibitor PX-478 alleviates high cholesterol diet-induced atherosclerosis by reducing adipose ceramide generation, which lowers cholesterol levels and reduces inflammatory responses, resulting in improved dyslipidemia and atherogenesis. Smpd3, the gene encoding neutral sphingomyelinase, is identified as a new target gene directly regulated by HIF-1α that is involved in ceramide generation. Epididymal adipose tissue injected with lentivirus-SMPD3 reverses the decrease in ceramides in adipocytes and eliminates the improvements on atherosclerosis in the adipocyte HIF-1α-deficient mice. Therefore, inhibitors of HIF-1α may constitute a novel approach to slow atherosclerotic progression.
- Published
- 2022