p53-induced adipose tissue inflammation is critically involved in the development of insulin resistance in heart failure.
Several clinical studies have shown that insulin resistance is prevalent among patients with heart failure, but the underlying mechanisms have not been fully elucidated. Here, we report a mechanism of insulin resistance associated with heart failure that involves upregulation of p53 in adipose tissue. We found that pressure overload markedly upregulated p53 expression in adipose tissue along with an increase of adipose tissue inflammation. Chronic pressure overload accelerated lipolysis in adipose tissue. In the presence of pressure overload, inhibition of lipolysis by sympathetic denervation significantly downregulated adipose p53 expression and inflammation, thereby improving insulin resistance. Likewise, disruption of p53 activation in adipose tissue attenuated inflammation and improved insulin resistance but also ameliorated cardiac dysfunction induced by chronic pressure overload. These results indicate that chronic pressure overload upregulates adipose tissue p53 by promoting lipolysis via the sympathetic nervous system, leading to an inflammatory response of adipose tissue and insulin resistance.
Department of Cardiovascular Science and Medicine, Chiba University Graduate School of Medicine, Chiba 260-8670, Japan.
Ippei
I
Shimizu
Yohko
Y
Yoshida
Taro
T
Katsuno
Kaoru
K
Tateno
Sho
S
Okada
Junji
J
Moriya
Masataka
M
Yokoyama
Aika
A
Nojima
Takashi
T
Ito
Rudolf
R
Zechner
Issei
I
Komuro
Yoshio
Y
Kobayashi
Tohru
T
Minamino
D000273:Adipose Tissue / Q000378:metabolism*; D000818:Animals; D002460:Cell Line; D006333:Heart Failure / Q000150:complications / Q000378:metabolism* / Q000503:physiopathology; D006801:Humans; D007249:Inflammation / Q000150:complications / Q000378:metabolism* / Q000473:pathology; D007333:Insulin Resistance; D007545:Isoproterenol / Q000494:pharmacology; D050356:Lipid Metabolism / Q000187:drug effects; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D011312:Pressure; D013564:Sympathetic Nervous System / Q000378:metabolism; D016159:Tumor Suppressor Protein p53 / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D015854:Up-Regulation
D016159:Tumor Suppressor Protein p53; D007545:Isoproterenol