Mature adipocytes inhibit in vitro differentiation of human preadipocytes via angiotensin type 1 receptors

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Item Type:	Article
Title:	Mature adipocytes inhibit in vitro differentiation of human preadipocytes via angiotensin type 1 receptors
Creators Name:	Janke, J., Engeli, S., Gorzelniak, K., Luft, F.C. and Sharma, A.M.
Abstract:	Recent studies suggest that angiotensin II (Ang II) plays a role in the adipogenesis of murine preadipocytes. Here, we examined the role of Ang II for the differentiation of primary cultured human preadipocytes. Preadipocytes were isolated from human adipose tissue and stimulated to differentiate. Quantitation of gene expression during adipogenesis was performed for renin-angiotensin system (RAS) genes. The influence of the RAS on adipogenic differentiation was investigated by addition of either angiotensinogen (AGT), Ang II, or angiotensin receptor antagonists to the differentiation medium. We also examined the influence of adipocytes on adipogenesis by co-culture experiments. Expression of the RAS genes AGT, renin, angiotensin-converting enzyme, and Ang II type 1 receptor increased during adipogenesis. Stimulation of the Ang II type 1 receptor by Ang II reduced adipose conversion, whereas blockade of this receptor markedly enhanced adipogenesis. Adipocytes were able to inhibit preadipocyte differentiation in the co-culture, and this effect was abolished by blockade of the Ang II type 1 receptor. This finding points to a functional role of the RAS in the differentiation of human adipose tissue. Because AGT secretion and Ang II generation are characteristic features of adipogenesis, we postulate a paracrine negative-feedback loop that inhibits further recruitment of preadipocytes by maturing adipocytes.
Keywords:	Adipocytes, Angiotensin II, Angiotensin Receptor Antagonists, Angiotensin Receptors, Angiotensin Type 1 Receptor, Angiotensin-Converting Enzyme Inhibitors, Angiotensinogen, Biphenyl Compounds, Captopril, Cell Differentiation, Coculture Techniques, Cultured Cells, Cytoplasmic and Nuclear Receptors, Gene Expression, Renin-Angiotensin System, Stem Cells, Tetrazoles, Transcription Factors
Source:	Diabetes
ISSN:	0012-1797
Publisher:	American Diabetes Association
Volume:	51
Number:	6
Page Range:	1699-1707
Date:	1 June 2002
Official Publication:	https://doi.org/10.2337/diabetes.51.6.1699
PubMed:	View item in PubMed

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