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01.02.2011

Blockade of the Renin-Angiotensin System Ameliorates Apelin Production in 3T3-L1 Adipocytes

verfasst von: Wei-Wen Hung, Tusty-Jiuan Hsieh, Tzu Lin, Pong-Chun Chou, Pi-Jung Hsiao, Kun-Der Lin, Shyi-Jang Shin

Erschienen in: Cardiovascular Drugs and Therapy | Ausgabe 1/2011

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Abstract

Purpose

Angiotensin II (Ang II), the physiologically-active product of the renin-angiotensin system (RAS), has recently been found to be an adipokine secreted by adipocytes. Although Ang II is known to exert its effects via angiotensin II receptor type 1 (AT1R) or type 2 (AT2R), the roles of the two receptors in the adipose tissue are unclear. Apelin, another adipokine, has been found able to restore glucose tolerance in obese and insulin-resistant mice. Because they are both involved in metabolic disorders, there may be an interaction between the two adipokines.

Methods

To observe the expression of RAS and apelin, 3T3-L1 adipocytes were harvested after 1, 2, 4, and 6 days of differentiation. The RAS blockers captopril (10−4 M), perindopril (10−3 M), losartan (10−4 M), or PD123319 (10−4 M) were added at day 2 of differentiation and harvested at day 4 and 6, when apelin expression was measured. Expressions of mRNAs were detected by real-time PCR. Production of Ang II and apelin was measured from culture media by ELISA. Cellular lipid droplets were detected by oil-red staining.

Results

Our study showed that the mRNA expressions of AGT, renin, ACE1, and AT2R were up-regulated while AT1R mRNA was down-regulated during adipogenesis. Apelin expression increased during adipogenesis, and this increase was further augmented by blocking RAS. RAS blockers also prevented excessive lipid accumulation and the generation of ROS (reactive oxygen species) in differentiating adipocytes.

Conclusions

Our study suggests that RAS blockers achieve their beneficial effects by their enhancement of adipocyte secretion of apelin.
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Metadaten
Titel
Blockade of the Renin-Angiotensin System Ameliorates Apelin Production in 3T3-L1 Adipocytes
verfasst von
Wei-Wen Hung
Tusty-Jiuan Hsieh
Tzu Lin
Pong-Chun Chou
Pi-Jung Hsiao
Kun-Der Lin
Shyi-Jang Shin
Publikationsdatum
01.02.2011
Verlag
Springer US
Erschienen in
Cardiovascular Drugs and Therapy / Ausgabe 1/2011
Print ISSN: 0920-3206
Elektronische ISSN: 1573-7241
DOI
https://doi.org/10.1007/s10557-010-6274-4

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