W. Ding et Dm. Templeton, Stress-activated protein kinase-dependent induction of c-fos by Cd2+ is mediated by MKK7, BIOC BIOP R, 273(2), 2000, pp. 718-722
Citations number
30
Categorie Soggetti
Biochemistry & Biophysics
Journal title
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Exposure of mesangial cells to ionic Cd2+ induces the proto-oncogene c-fos,
while activating both Erk and stress-activated protein kinase (SAPK) MAP k
inase pathways. While we have previously used a pharmacological inhibitor o
f Erk activation to implicate involvement of this pathway in the induction
of c-fos by Cd2+, the consequences of SAPK activation remained unknown. Her
e me use dominant negative inhibitors of the SAPK kinases, SEK1 and MKK7, t
o show that Cd2+ activates SAPK through MKK7, but that partial inhibition o
f SAPK alone is insufficient to significantly affect the magnitude of the C
d2+-dependent increase in c-fos mRNA However, inhibition of Erk and SAPK pa
thways together abrogates the increase, suggesting that these pathways act
in concert in the induction of c-fos by this toxic metal. (C) 2000 Academic
Press.