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Cell Growth & Differentiation Vol. 13, 307-313, July 2002
© 2002 American Association for Cancer Research

Expression of Kinase Suppressor of Ras in the Normal Adult and Embryonic Mouse1

Susan M. Giblett, David J. Lloyd, Yvonne Light, Richard Marais and Catrin A. Pritchard2

Department of Biochemistry, University of Leicester, Leicester LE1 7RH [S. M. G., D. J. L., C. A. P.], and Institute of Cancer Research, London SW3 6JB [Y. L., R. M.], United Kingdom

Recent studies indicate that kinase suppressor of Ras (KSR)is a scaffold protein for the Ras/Raf/MEK/ERK signaling cascade in mammals. To help determine the in vivo function of KSR, we have examined the tissue-specific distribution of this protein in the embryonic and adult mouse using a rat monoclonal antibody raised against the mouse protein. Western blot analysis indicates that the protein is expressed at highest levels in the adult brain. It is also expressed at low levels in bladder, ovary, testis, and lung, but the protein is not detectable in any other adult tissue. However, reverse transcription-PCR analysis shows that Ksr transcripts are detected in all adult tissues except the liver. A variant containing a differentially spliced exon in the CA4 domain is observed in brain, cerebellum, ovary, and intestine. The protein is also expressed throughout the E6.5 embryo and at high levels in the neuroepithelium of the E10.5 embryo. At this embryonic stage, expression is also detected at lower levels in the limb and tail buds as well as in the myocardium.




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Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 2002 by the American Association of Cancer Research.