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Retinol-Binding Pro...
Retinol-Binding Protein 4 Inhibits Insulin Signaling in Adipocytes by Inducing Proinflammatory Cytokines in Macrophages through a c-Jun N-Terminal Kinase- and Toll-Like Receptor 4-Dependent and Retinol-Independent Mechanism
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Norseen, J. (author)
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Hosooka, T. (author)
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- Hammarstedt, Ann, 1975 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för medicin, avdelningen för molekylär och klinisk medicin,Institute of Medicine, Department of Molecular and Clinical Medicine
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Yore, M. M. (author)
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Kant, S. (author)
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Aryal, P. (author)
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Kiernan, U. A. (author)
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Phillips, D. A. (author)
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Maruyama, H. (author)
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Kraus, B. J. (author)
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Usheva, A. (author)
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Davis, R. J. (author)
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- Smith, Ulf, 1943 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för medicin, avdelningen för molekylär och klinisk medicin,Institute of Medicine, Department of Molecular and Clinical Medicine
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Kahn, B. B. (author)
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(creator_code:org_t)
- 2023-03-20
- 2012
- English.
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In: Molecular and Cellular Biology. - : Informa UK Limited. - 0270-7306 .- 1098-5549. ; 32:10, s. 2010-2019
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https://gup.ub.gu.se...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Retinol-binding protein 4 (RBP4), the sole retinol transporter in blood, is secreted from adipocytes and liver. Serum RBP4 levels correlate highly with insulin resistance, other metabolic syndrome factors, and cardiovascular disease. Elevated serum RBP4 causes insulin resistance, but the molecular mechanisms are unknown. Here we show that RBP4 induces expression of proinflammatory cytokines in mouse and human macrophages and thereby indirectly inhibits insulin signaling in cocultured adipocytes. This occurs through activation of c-Jun N-terminal protein kinase (JNK) and Toll-like receptor 4 (TLR4) pathways independent of the RBP4 receptor, STRA6. RBP4 effects are markedly attenuated in JNK1(-/-) JNK2(-/-) macrophages and TLR4(-/-) macrophages. Because RBP4 is a retinol-binding protein, we investigated whether these effects are retinol dependent. Unexpectedly, retinol-free RBP4 (apo-RBP4) is as potent as retinol-bound RBP4 (holo-RBP4) in inducing proinflammatory cytokines in macrophages. Apo-RBP4 is likely to be physiologically significant since RBP4/retinol ratios are increased in serum of lean and obese insulin-resistant humans compared to ratios in insulin-sensitive humans, indicating that higher apo-RBP4 is associated with insulin resistance independent of obesity. Thus, RBP4 may cause insulin resistance by contributing to the development of an inflammatory state in adipose tissue through activation of proinflammatory cytokines in macrophages. This process reveals a novel JNK- and TLR4-dependent and retinol- and STRA6-independent mechanism of action for RBP4.
Subject headings
- NATURVETENSKAP -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)
Keyword
- impaired glucose-tolerance
- serum retinol-binding-protein-4
- vitamin-a
- metabolic syndrome
- gene-expression
- adipose-tissue
- weight-loss
- kappa-b
- visceral adiposity
- tnf-alpha
Publication and Content Type
- ref (subject category)
- art (subject category)
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To the university's database
- By the author/editor
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Norseen, J.
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Hosooka, T.
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Hammarstedt, Ann ...
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Yore, M. M.
-
Kant, S.
-
Aryal, P.
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show more...
-
Kiernan, U. A.
-
Phillips, D. A.
-
Maruyama, H.
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Kraus, B. J.
-
Usheva, A.
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Davis, R. J.
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Smith, Ulf, 1943
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Kahn, B. B.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Biological Scien ...
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and Biochemistry and ...
- Articles in the publication
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Molecular and Ce ...
- By the university
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University of Gothenburg