Adipose tissue–specific dysregulation of angiotensinogen by oxidative stress in obesity

Abstract Adipose tissue expresses all components of the renin-angiotensin system including angiotensinogen (AGT). Recent studies have highlighted a potential role of AGT in adipose tissue function and homeostasis. However, some controversies surround the regulatory mechanisms of AGT in obese adipose...

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Veröffentlicht in:Metabolism, clinical and experimental clinical and experimental, 2010-09, Vol.59 (9), p.1241-1251
Hauptverfasser: Okada, Sadanori, Kozuka, Chisayo, Masuzaki, Hiroaki, Yasue, Shintaro, Ishii-Yonemoto, Takako, Tanaka, Tomohiro, Yamamoto, Yuji, Noguchi, Michio, Kusakabe, Toru, Tomita, Tsutomu, Fujikura, Junji, Ebihara, Ken, Hosoda, Kiminori, Sakaue, Hiroshi, Kobori, Hiroyuki, Ham, Mira, Lee, Yun Sok, Kim, Jae Bum, Saito, Yoshihiko, Nakao, Kazuwa
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container_end_page 1251
container_issue 9
container_start_page 1241
container_title Metabolism, clinical and experimental
container_volume 59
creator Okada, Sadanori
Kozuka, Chisayo
Masuzaki, Hiroaki
Yasue, Shintaro
Ishii-Yonemoto, Takako
Tanaka, Tomohiro
Yamamoto, Yuji
Noguchi, Michio
Kusakabe, Toru
Tomita, Tsutomu
Fujikura, Junji
Ebihara, Ken
Hosoda, Kiminori
Sakaue, Hiroshi
Kobori, Hiroyuki
Ham, Mira
Lee, Yun Sok
Kim, Jae Bum
Saito, Yoshihiko
Nakao, Kazuwa
description Abstract Adipose tissue expresses all components of the renin-angiotensin system including angiotensinogen (AGT). Recent studies have highlighted a potential role of AGT in adipose tissue function and homeostasis. However, some controversies surround the regulatory mechanisms of AGT in obese adipose tissue. In this context, we here demonstrated that the AGT messenger RNA (mRNA) level in human subcutaneous adipose tissue was significantly reduced in obese subjects as compared with nonobese subjects. Adipose tissue AGT mRNA level in obese mice was also lower as compared with their lean littermates; however, the hepatic AGT mRNA level remained unchanged. When 3T3-L1 adipocytes were cultured for a long period, the adipocytes became hypertrophic with a marked increase in the production of reactive oxygen species. Expression and secretion of AGT continued to decrease during the course of adipocyte hypertrophy. Treatment of the 3T3-L1 and primary adipocytes with reactive oxygen species (hydrogen peroxide) or tumor necrosis factor α caused a significant decrease in the expression and secretion of AGT. On the other hand, treatment with the antioxidant N -acetyl cysteine suppressed the decrease in the expression and secretion of AGT in the hypertrophied 3T3-L1 adipocytes. Finally, treatment of obese db/db mice with N -acetyl cysteine augmented the expression of AGT in the adipose tissue, but not in the liver. The present study demonstrates for the first time that oxidative stress dysregulates AGT in obese adipose tissue, providing a novel insight into the adipose tissue–specific interaction between the regulation of AGT and oxidative stress in the pathophysiology of obesity.
doi_str_mv 10.1016/j.metabol.2009.11.016
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Recent studies have highlighted a potential role of AGT in adipose tissue function and homeostasis. However, some controversies surround the regulatory mechanisms of AGT in obese adipose tissue. In this context, we here demonstrated that the AGT messenger RNA (mRNA) level in human subcutaneous adipose tissue was significantly reduced in obese subjects as compared with nonobese subjects. Adipose tissue AGT mRNA level in obese mice was also lower as compared with their lean littermates; however, the hepatic AGT mRNA level remained unchanged. When 3T3-L1 adipocytes were cultured for a long period, the adipocytes became hypertrophic with a marked increase in the production of reactive oxygen species. Expression and secretion of AGT continued to decrease during the course of adipocyte hypertrophy. Treatment of the 3T3-L1 and primary adipocytes with reactive oxygen species (hydrogen peroxide) or tumor necrosis factor α caused a significant decrease in the expression and secretion of AGT. On the other hand, treatment with the antioxidant N -acetyl cysteine suppressed the decrease in the expression and secretion of AGT in the hypertrophied 3T3-L1 adipocytes. Finally, treatment of obese db/db mice with N -acetyl cysteine augmented the expression of AGT in the adipose tissue, but not in the liver. 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Recent studies have highlighted a potential role of AGT in adipose tissue function and homeostasis. However, some controversies surround the regulatory mechanisms of AGT in obese adipose tissue. In this context, we here demonstrated that the AGT messenger RNA (mRNA) level in human subcutaneous adipose tissue was significantly reduced in obese subjects as compared with nonobese subjects. Adipose tissue AGT mRNA level in obese mice was also lower as compared with their lean littermates; however, the hepatic AGT mRNA level remained unchanged. When 3T3-L1 adipocytes were cultured for a long period, the adipocytes became hypertrophic with a marked increase in the production of reactive oxygen species. Expression and secretion of AGT continued to decrease during the course of adipocyte hypertrophy. Treatment of the 3T3-L1 and primary adipocytes with reactive oxygen species (hydrogen peroxide) or tumor necrosis factor α caused a significant decrease in the expression and secretion of AGT. On the other hand, treatment with the antioxidant N -acetyl cysteine suppressed the decrease in the expression and secretion of AGT in the hypertrophied 3T3-L1 adipocytes. Finally, treatment of obese db/db mice with N -acetyl cysteine augmented the expression of AGT in the adipose tissue, but not in the liver. The present study demonstrates for the first time that oxidative stress dysregulates AGT in obese adipose tissue, providing a novel insight into the adipose tissue–specific interaction between the regulation of AGT and oxidative stress in the pathophysiology of obesity.</abstract><cop>United States</cop><pub>Elsevier Inc</pub><pmid>20045538</pmid><doi>10.1016/j.metabol.2009.11.016</doi><tpages>11</tpages><oa>free_for_read</oa></addata></record>
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subjects Adipocytes - cytology
Adipocytes - metabolism
Adult
Angiotensinogen - genetics
Angiotensinogen - metabolism
Animals
Cell Size
Cells, Cultured
Endocrinology & Metabolism
Female
Humans
Male
Mice
Mice, Obese
Middle Aged
Obesity - genetics
Obesity - metabolism
Obesity - physiopathology
Oxidative Stress
Reactive Oxygen Species - metabolism
Reverse Transcriptase Polymerase Chain Reaction
RNA, Messenger - genetics
RNA, Messenger - metabolism
Subcutaneous Fat - metabolism
Subcutaneous Fat - physiopathology
Tumor Necrosis Factor-alpha - metabolism
title Adipose tissue–specific dysregulation of angiotensinogen by oxidative stress in obesity
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