Arsenite blocks growth factor induced activation of the MAP kinase cascade, upstream of Ras and downstream of Grb2-Sos.

Abstract:

:Pretreatment of cells with 0.5 mM sodium arsenite (but not other activators of stress-activated MAP kinase cascades) prevents the activation of p21Ras and strongly suppresses the activation of c-Raf and the MAP kinase cascade by a variety of growth factors. Arsenite appears to exert its effect by preventing the guanine nucleotide exchange factor mSos from converting Ras to its active GTP-bound state. Exposure to arsenite may be a simple way of assessing whether Ras plays an essential role in mediating activation of the MAP kinase cascade by extracellular signals.

journal_name

Oncogene

journal_title

Oncogene

authors

Doza YN,Hall-Jackson CA,Cohen P

doi

10.1038/sj.onc.1202168

subject

Has Abstract

pub_date

1998-07-09 00:00:00

pages

19-24

issue

1

eissn

0950-9232

issn

1476-5594

journal_volume

17

pub_type

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