ATM Regulates Adipocyte Differentiation and Contributes to Glucose Homeostasis
Masatoshi Takagi, Hatsume Uno, Rina Nishi, Masataka Sugimoto, Setsuko Hasegawa, Jinhua Piao, Norimasa Ihara, Sayaka Kanai, Saori Kakei, Yoshifumi Tamura, Takayoshi Suganami, Yasutomi Kamei, Toshiaki Shimizu, Akio Yasuda, Yoshihiro Ogawa, Shuki Mizutani, Masatoshi Takagi, Hatsume Uno, Rina Nishi, Masataka Sugimoto, Setsuko Hasegawa, Jinhua Piao, Norimasa Ihara, Sayaka Kanai, Saori Kakei, Yoshifumi Tamura, Takayoshi Suganami, Yasutomi Kamei, Toshiaki Shimizu, Akio Yasuda, Yoshihiro Ogawa, Shuki Mizutani
Abstract
Ataxia-telangiectasia (A-T) patients occasionally develop diabetes mellitus. However, only limited attempts have been made to gain insight into the molecular mechanism of diabetes mellitus development in A-T patients. We found that Atm-/- mice were insulin resistant and possessed less subcutaneous adipose tissue as well as a lower level of serum adiponectin than Atm+/+ mice. Furthermore, in vitro studies revealed impaired adipocyte differentiation in Atm-/- cells caused by the lack of induction of C/EBPα and PPARγ, crucial transcription factors involved in adipocyte differentiation. Interestingly, ATM was activated by stimuli that induced differentiation, and the binding of ATM to C/EBPβ and p300 was involved in the transcriptional regulation of C/EBPα and adipocyte differentiation. Thus, our study sheds light on the poorly understood role of ATM in the pathogenesis of glucose intolerance in A-T patients and provides insight into the role of ATM in glucose metabolism.
Copyright © 2015 The Authors. Published by Elsevier Inc. All rights reserved.
Source: PubMed