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Sensitivity to cis‐diamminedichloroplatinum in human cancer cells is related to expression of cyclin D1 but not C‐RAF‐1 protein
Author(s) -
Warenius Hilmar M.,
Seabra Laurence A.,
Maw Paula
Publication year - 1996
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/(sici)1097-0215(19960717)67:2<224::aid-ijc13>3.0.co;2-b
Subject(s) - cyclin d1 , cancer research , transfection , oncogene , radiosensitivity , biology , protein kinase c , radiation sensitivity , cell culture , kinase , microbiology and biotechnology , signal transduction , cell cycle , cell , medicine , genetics , radiation therapy , irradiation , physics , nuclear physics
Although several oncogenes, including c‐ myc , ras and c‐ raf ‐1, have been implicated in cellular resistance to ionising radiation, there is less information relating oncogene expression to cis ‐diamminedochloroplatinum (CDDP) resistance. However, transfection of c‐ myc or v‐H‐ ras and activation of protein kinase C (PKC), which contributes to the RAF‐I, MAP kinase signal transduction pathway, can influence therapeutic response to CDDP. Activation of PKC increases CDDP sensitivity, whilst transfected c‐ myc or v‐H‐ ras induce CDDP resistance. We have previously reported that human in vitro cell lines show different patterns of sensitivity to CDDP and 4 MeV X‐irradiation. In these cells radiation sensitivity is related to high levels of expression of the c‐ raf ‐1 proto‐oncogene. We thus predicted that cells sensitive to CDDP might show a different relationship to c‐raf‐1 expression. In addition, because cyclin D1 expression can be upregulated by the myc or ras oncogenes, we also chose to study putative relationships between cyclin D1 protein levels and intrinsic cellular sensitivity to CDDP and γ‐irradiation. We report that in the 16 human cell lines which we have studied, high cyclin D1 expression is related to CDDP resistance but has no relationship with radiation responsiveness, whereas high c‐raf‐1 expression, although related to radiosensitivity has no relationship with CDDP responsiveness. © 1996 Wiley‐Liss, Inc.