Aim To assay the possible targets of
adriamycin (ADM),
screening ADM resistance related
proteins.
Methods The
drug sensitivity of the
cells was analyzed by
IC50 assay;RT-PCR assay was used to detect the expression of
genes in the
cells;CMPK1
protein expression was tested by
Western blot assay;the expression of CMPK1 in the
cells was decreased by
siRNA of CMPK1.Results Data from
IC50 assay showed the
sensitivity of
cells transfected with CMPK1 was increased most(
IC50 HEK293-CMPK /
IC50 HEK293-Control=0.15, P<0.01), and the expression of CMPK1
protein in ADM resistant
breast cells (MCF7/ADM) was lower than that in
parent MCF7 cells (P<0.05).When the expression level of CMPK1 was decreased by CMPK1
siRNA, the
sensitivity of
MCF7 cells to ADM decreased (
IC50 MCF7-siCMPK1/IC50MCF7-Control=3.6, P< 0.01), and the
sensitivity of
MCF7 cells to
paclitaxel and
gemcitabine also decreased.Conclusions CMPK1 was related to the
multidrug resistance of
cells, and the expression of CMPK1 was positively related to the
sensitivity to
drugs, which provides the possibility of CMPK1 as a target in the
treatment of
multidrug resistance.