The DOI matches its Crossref record; 1 of the 1 references it cites were found in a registry or an index.
Transcriptional repression of the GLUT4 and C/EBP genes in 3T3-L1 adipocytes by tumor necrosis factor-alpha.
Open accessAbstract
Fully differentiated 3T3-L1 adipocytes were chronically exposed to 5 nM tumor necrosis factor-alpha (TNF). This resulted in the development of an insulin resistance based on the inability of insulin to stimulate hexose uptake. Western blot analysis for glucose transporter protein in isolated membrane fractions indicated a total depletion of GLUT4 protein (insulin-responsive glucose transporter) in cells chronically treated with TNF. Plasma membrane content of GLUT1 protein (growth-related glucose transporter) was similar in both control and TNF-treated cells; however, the GLUT1 content of the intracellular membrane compartment had decreased markedly after TNF treatment. Continuous exposure to TNF resulted in an 85-90% decrease in the mRNA content for both GLUT4 and 422 (aP2, a lipid binding protein) genes relative to age matched controls, whereas insulin receptor mRNA levels declined by at least 50%. This was preceded by a marked decrease in mRNA accumulation for C/EBP, a transcription factor proposed to control expression of both GLUT4 and 422. The specificity of these observations was demonstrated by the lack of an effect of the chronic TNF treatment on either beta-actin or lipoprotein lipase mRNA content. The decreased content of GLUT4 and C/EBP mRNA was judged to be regulated at least in part at the level of transcription, based on the results of transcription run-on assays. Thus, the lack of response to insulin appeared due to a suppression of GLUT4 expression as well as a decreased intracellular content of GLUT1.
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“This is particularly troublesome given the decreased metabolic control in the HIV-1 patient population [7] are co-morbidities, including cardiovascular diseases [8], obesity [9], non-alcoholic fatty liver disease (NAFLD), and type-2 diabetes (T2D) [10,11].”
BackgroundInfluential
Metadata
- Authors
- Stephens, J. M., & Pekala, P. H.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1991-11
- Volume
- 266
- Issue
- 32
- Pages
- 21839-21845
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W1597210981
- Cited by
- 370
- References
- 1
- FWCI
- 7.66
- Type
- journal article
- Language
- en
- Open access
- hybrid
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