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Varela-Guruceaga M, Milagro FI, Martínez JA, de Miguel C. Effect of hypoxia on caveolae-related protein expression and insulin signaling in adipocytes. Mol Cell Endocrinol 2018; 473:257-267. [PMID: 29407195 DOI: 10.1016/j.mce.2018.01.026] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Revised: 01/18/2018] [Accepted: 01/29/2018] [Indexed: 12/12/2022]
Abstract
Obesity is characterized by hypertrophy and hyperplasia of adipose tissue, which have been related to the development of hypoxia and insulin resistance. On the other hand, caveolin-1 (Cav-1), one of the main proteins of caveolae, promotes insulin receptor (IR) phosphorylation and the subsequent activation of insulin signaling. In this work we investigated the effect of hypoxia on Cav-1 regulation and the status of insulin signaling in 3T3-L1 adipocytes. Our results showed that hypoxia inhibited adipogenesis and insulin signaling in adipocytes. Furthermore, 48 h of hypoxia reduced insulin-induced glucose uptake while increased basal glucose uptake. This result was consistent with the upregulation of glucose transporter GLUT1 and the downregulation of GLUT4, which also showed defective translocation to plasma membrane when adipocytes were stimulated with insulin. In addition, the expression of caveolae-related proteins was reduced by hypoxia and chromatin immunoprecipitation assay demonstrated that Cav-1 transcription was directly regulated by HIF-1. These results strengthen the role of caveolae in insulin signaling and help to explain adipocyte response to hypoxia.
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Affiliation(s)
- M Varela-Guruceaga
- Department of Biochemistry and Genetics, University of Navarra, Pamplona, Spain, C/ Irunlarrea 1, 31008, Pamplona, Navarra, Spain; Centre for Nutrition Research, University of Navarra, Pamplona, Spain, C/ Irunlarrea 1, 31008, Pamplona, Navarra, Spain
| | - F I Milagro
- Centre for Nutrition Research, University of Navarra, Pamplona, Spain, C/ Irunlarrea 1, 31008, Pamplona, Navarra, Spain; Department of Nutrition, Food Sciences and Physiology, University of Navarra, Pamplona, Spain, C/ Irunlarrea 1, 31008, Pamplona, Navarra, Spain; CIBERobn, Centro de Investigación Biomédica en Red de la Fisiopatología de la Obesidad y Nutrición, Carlos III Health Research Institute, Madrid, Spain
| | - J A Martínez
- Centre for Nutrition Research, University of Navarra, Pamplona, Spain, C/ Irunlarrea 1, 31008, Pamplona, Navarra, Spain; Department of Nutrition, Food Sciences and Physiology, University of Navarra, Pamplona, Spain, C/ Irunlarrea 1, 31008, Pamplona, Navarra, Spain; CIBERobn, Centro de Investigación Biomédica en Red de la Fisiopatología de la Obesidad y Nutrición, Carlos III Health Research Institute, Madrid, Spain
| | - C de Miguel
- Department of Biochemistry and Genetics, University of Navarra, Pamplona, Spain, C/ Irunlarrea 1, 31008, Pamplona, Navarra, Spain; Centre for Nutrition Research, University of Navarra, Pamplona, Spain, C/ Irunlarrea 1, 31008, Pamplona, Navarra, Spain; CIBERobn, Centro de Investigación Biomédica en Red de la Fisiopatología de la Obesidad y Nutrición, Carlos III Health Research Institute, Madrid, Spain.
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