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Mol. Cell. Biol., Mar 1996, 1157-1168, Vol 16, No. 3
BP Chen, CD Wolfgang and T Hai
We demonstrate that ATF3, a member of the ATF/CREB family of transcription
factors, is induced in a variety of stressed tissues: mechanically injured
liver, toxin-injured liver, blood-deprived heart, and postseizure brain. We
also demonstrate that an ATF3-interacting protein, gadd153/Chop10, forms a
nonfunctional heterodimer with ATF3: the heterodimer, in contrast to the
ATF3 homodimer, does not bind to the ATF/cyclic AMP response element
consensus site and does not repress transcription. Interestingly, ATF3 and
gadd153/Chop10 are expressed in inverse but overlapping manners during the
liver's response to carbon tetrachloride (CCl4): the level of
gadd153/Chop10 mRNA is high in the normal liver and greatly decreases upon
CCl4 treatment; the level of ATF3 mRNA, on the other hand, is low in the
normal liver and greatly increases upon CCl4 treatment. We hypothesize that
in nonstressed liver, gadd153/Chop10 inhibits the limited amount of ATF3 by
forming an inactive heterodimer with it, whereas in CCl4-injured liver, the
synthesis of gadd153/Chop10 is repressed, allowing the induced ATF3 to
function.
Copyright © 1996, American Society for Microbiology
Analysis of ATF3, a transcription factor induced by physiological stresses and modulated by gadd153/Chop10
Ohio State Biochemistry Program, Ohio State University, Columbus, 43210, USA.
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