CD36 deletion reduces VLDL secretion, modulates liver prostaglandins, and exacerbates hepatic steatosis in ob/ob mice
| Autor: | Okunade L. Adewole, Elizabeth M. Brunt, Fatiha Nassir, Nada A. Abumrad |
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| Rok vydání: | 2013 |
| Předmět: |
CD36 Antigens
Very low-density lipoprotein medicine.medical_specialty Apolipoprotein B Prostaglandin QD415-436 Lipoproteins VLDL Biology digestive system Biochemistry Gene Knockout Techniques Mice chemistry.chemical_compound Endocrinology Internal medicine parasitic diseases medicine Animals Humans Kupffer cells Secretion triglyceride Research Articles Fatty liver hemic and immune systems Cell Biology medicine.disease Fatty Liver cyclooxygenase Liver chemistry Lipogenesis Prostaglandins biology.protein lipids (amino acids peptides and proteins) Cyclooxygenase Steatosis circulatory and respiratory physiology |
| Zdroj: | Journal of Lipid Research, Vol 54, Iss 11, Pp 2988-2997 (2013) |
| ISSN: | 0022-2275 |
| DOI: | 10.1194/jlr.m037812 |
| Popis: | Recent findings described the role of CD36-mediated signaling in regulating cellular calcium and the release of various bioactive molecules, including the prostaglandins, neurotransmitters, cholecystokinin, and secretin. Here we document the role of CD36 in the secretion of hepatic VLDL. CD36 deletion resulted in 60% suppression of VLDL output in vivo, and VLDL secretion was reduced in vitro using incubated liver slices. The effect of CD36 deletion was mediated by enhancing formation of hepatic prostaglandins D2, F2, and E2. Treatment of CD36-deficient slices with inhibitors of cyclooxygenases reversed the reduction in triglyceride secretion. We also examined the effect of CD36 deletion on the obesity-associated spontaneous steatosis of the ob/ob mouse that is driven by enhanced de novo lipogenesis. Homozygous ob/ob mice lacking CD36 (ob-CD36−/−) were generated and studied for hepatic triglyceride accumulation and VLDL secretion. Livers of ob/ob mice were steatotic as expected and had 5-fold more CD36 on Kupffer cells and hepatocytes. CD36 deletion exacerbated the steatosis by impairing hepatic triglyceride and apoB secretion through increasing prostaglandin levels. These findings suggest an unappreciated role of CD36 in regulating VLDL secretion, which might have relevance to some forms of fatty liver. They provide insight into the association reported in humans between CD36 protein expression and serum levels of apoB and VLDL particle number. |
| Databáze: | OpenAIRE |
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