TY - JOUR
T1 - A crucial role for bone morphogenetic protein-Smad1 signalling in the DNA damage response
AU - Chau, Jenny Fung Ling
AU - Jia, Deyong
AU - Wang, Zhongfeng
AU - Liu, Zhi
AU - Hu, Yuanyu
AU - Zhang, Xin
AU - Jia, Hao
AU - Lai, Keng Po
AU - Leong, Wai Fook
AU - Au, Bi Jin
AU - Mishina, Yuji
AU - Chen, Ye-Guang
AU - Biondi, Christine
AU - Robertson, Elizabeth
AU - Xie, Dong
AU - Liu, Huijuan
AU - He, Lin
AU - Wang, Xueying
AU - Yu, Qiang
AU - Li, Baojie
PY - 2012/5
Y1 - 2012/5
N2 - DNA damage and the elicited cellular response underlie the etiology of tumorigenesis and ageing. Yet, how this response integrates inputs from cells' environmental cues remains underexplored. Here we report that the BMP-Smad1 pathway, which is essential for embryonic development and tissue homeostasis, has an important role in the DNA damage response and oncogenesis. On genotoxic stress, Atm phosphorylates BMPs-activated Smad1 in the nucleus on S239, which disrupts Smad1 interaction with protein phosphatase PPM1A, leading to enhanced activation and upregulation of Smad1. Smad1 then interacts with p53 and inhibits Mdm2-mediated p53 ubiquitination and degradation to regulate cell proliferation and survival. Enhanced Smad1 S239 phosphorylation, and Smad1 mutations causing S239 substitution were detected in oesophageal and gastric cancer samples, respectively. These findings suggest that BMP-Smad1 signalling participates in the DNA damage response via the Atm-p53 pathway, thus providing a molecular mechanism whereby BMP-Smad1 loss-of-function leads to tumorigenesis, for example, juvenile polyposis and Cowden syndromes.
AB - DNA damage and the elicited cellular response underlie the etiology of tumorigenesis and ageing. Yet, how this response integrates inputs from cells' environmental cues remains underexplored. Here we report that the BMP-Smad1 pathway, which is essential for embryonic development and tissue homeostasis, has an important role in the DNA damage response and oncogenesis. On genotoxic stress, Atm phosphorylates BMPs-activated Smad1 in the nucleus on S239, which disrupts Smad1 interaction with protein phosphatase PPM1A, leading to enhanced activation and upregulation of Smad1. Smad1 then interacts with p53 and inhibits Mdm2-mediated p53 ubiquitination and degradation to regulate cell proliferation and survival. Enhanced Smad1 S239 phosphorylation, and Smad1 mutations causing S239 substitution were detected in oesophageal and gastric cancer samples, respectively. These findings suggest that BMP-Smad1 signalling participates in the DNA damage response via the Atm-p53 pathway, thus providing a molecular mechanism whereby BMP-Smad1 loss-of-function leads to tumorigenesis, for example, juvenile polyposis and Cowden syndromes.
UR - https://www.scopus.com/pages/publications/84864295500
U2 - 10.1038/ncomms1832
DO - 10.1038/ncomms1832
M3 - Article
C2 - 22588298
VL - 3
JO - Nature Communications
JF - Nature Communications
M1 - 836
ER -