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1992 ; 83
(5
): 522-6
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The number of platinum atoms binding to DNA, RNA and protein molecules of HeLa
cells treated with cisplatin at its mean lethal concentration
#MMPMID1618702
Akaboshi M
; Kawai K
; Maki H
; Akuta K
; Ujeno Y
; Miyahara T
Jpn J Cancer Res
1992[May]; 83
(5
): 522-6
PMID1618702
show ga
HeLa S-3 cells were treated with 195mPt-radiolabeled
cis-diamminedichloroplatinum(II) (CDDP) under various conditions, and the
relationship between lethal effect and the number of Pt atoms binding to DNA, RNA
and proteins was examined. The mean lethal concentrations for the cells treated
with CDDP at 37 degrees C for 1, 2 and 3 h were 2.8, 2.0 and 1.1 microgram/ml,
respectively. By using identically treated cells, the number of Pt atoms combined
with DNA, RNA and protein molecules were determined after fractionation of the
cells using the method of Schneider. In this way, the D0 values given as the drug
concentration were substituted for the number of Pt atoms combined with each
fraction, then the target volumes expressed as the reciprocals of D0 values were
calculated for each fraction. The results provide strong support for the idea
that DNA is the primary target for cell killing by CDDP, and the target volumes
were 5.17 x 10(4), 5.71 x 10(4) and 1.03 x 10(5) nucleotides for 1, 2 and 3 h
treated cells, respectively.