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Nagare, Tomoki; Sakaue, Hiroshi; Matsumoto, Michihiro; Cao, Yongheng; Inagaki, Kenjiro; Sakai, Mashito; Takashima, Yasuhiro; Nakamura, Kyoko; Mori, Toshiyuki; Okada, Yuko; Matsuki, Yasushi; Watanabe, Eijiro; Ikeda, Kazutaka; Taguchi, Ryo; Kamimura, Naomi; Ohta, Shigeo; Hiramatsu, Ryuji; Kasuga, Masato
Journal of biological chemistry/The Journal of biological chemistry, 10/2011, Letnik: 286, Številka: 43Journal Article
Krüppel-like factor 15 (KLF15), a member of the Krüppel-like factor family of transcription factors, has been found to play diverse roles in adipocytes in vitro. However, little is known of the function of KLF15 in adipocytes in vivo. We have now found that the expression of KLF15 in adipose tissue is down-regulated in obese mice, and we therefore generated adipose tissue-specific KLF15 transgenic (aP2-KLF15 Tg) mice to investigate the possible contribution of KLF15 to various pathological conditions associated with obesity in vivo. The aP2-KLF15 Tg mice manifest insulin resistance and are resistant to the development of obesity induced by maintenance on a high fat diet. However, they also exhibit improved glucose tolerance as a result of enhanced insulin secretion. Furthermore, this enhancement of insulin secretion was shown to result from down-regulation of the expression of stearoyl-CoA desaturase 1 (SCD1) in white adipose tissue and a consequent reduced level of oxidative stress. This is supported by the findings that restoration of SCD1 expression in white adipose tissue of aP2-KLF15 Tg mice exhibited increased oxidative stress in white adipose tissue and reduced insulin secretion with hyperglycemia. Our data thus provide an example of cross-talk between white adipose tissue and pancreatic β cells mediated through modulation of oxidative stress.
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