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Zhu, Ping,Baek, Sung Hee,Bourk, Eliot M.,Ohgi, Kenneth A.,Garcia-Bassets, Ivan,Sanjo, Hideki,Akira, Shizuo,Kotol, Paul F.,Glass, Christopher K.,Rosenfeld, Michael G.,Rose, David W. Elsevier 2006 Cell Vol.124 No.3
<P><B>Summary</B></P><P>Defining the precise molecular strategies that coordinate patterns of transcriptional responses to specific signals is central for understanding normal development and homeostasis as well as the pathogenesis of hormone-dependent cancers. Here we report specific prostate cancer cell/macrophage interactions that mediate a switch in function of selective androgen receptor antagonists/modulators (SARMs) from repression to activation in vivo. This is based on an evolutionarily conserved receptor N-terminal L/HX<SUB>7</SUB>LL motif, selectively present in sex steroid receptors, that causes recruitment of TAB2 as a component of an N-CoR corepressor complex. TAB2 acts as a sensor for inflammatory signals by serving as a molecular beacon for recruitment of MEKK1, which in turn mediates dismissal of the N-CoR/HDAC complex and permits derepression of androgen and estrogen receptor target genes. Surprisingly, this conserved sensor strategy may have arisen to mediate reversal of sex steroid-dependent repression of a limited cohort of target genes in response to inflammatory signals, linking inflammatory and nuclear receptor ligand responses to essential reproductive functions.</P>