TY - JOUR
T1 - Cytotoxicity of cisplatin and cisdiammine-1,1-cyclobutane dicarboxylate in MGH-U1 cells grown as monolayers, spheroids, and xenografts
AU - Erlichman, C.
AU - Vidgen, D.
AU - Wu, A.
PY - 1985
Y1 - 1985
N2 - The cytotoxicity of cisplatin and cisdiammine-1,1-cyclobutane dicarboxylate (CBDCA) was examined using the MGH-U1 human bladder carcinoma cell line, grown as monolayer cultures, multicellular tumor spheroid(s) (MTS), and xenografts in immune-deprived CBA/CaJ mice. The cell survival of exponentially growing monolayers and MTS treated with cisplatin declined in a monoexponential fashion with a concentration of drug resulting in 10% colony survival (D10) of 7.75 μg/ml and 9.5 μg/ml, respectively. MTS growth delay determination demonstrated a drug concentration-dependent increase in growth delay and a correlation between decreasing surviving fraction and increasing growth delay. In vivo treatment of MGH-U1 xenografts with cisplatin caused a modest decrease in surviving fraction although the xenografted cells treated in vitro demonstrated the same sensitivity to cisplatin as those cells maintained continuously in vitro. The D10 for CBDCA treatment was 246 μg/ml for exponentially growing monolayer cells and 196 μg/ml for MTS. Growth delay studies with CBDCA showed a concentration-dependent increase in spheroid growth delay and a correlation between decreasing surviving fraction and growth delay similar to cisplatin. The conclusions were that 1) cisplatin and CBDCA did not have any difficulty penetrating into spheroids, 2) both agents appeared to be active against the noncycling poorly nourished cells found near the necrotic center of spheroids, 3) both cisplatin and CBDCA were cytotoxic toward MGH-U1 cells but cisplatin was 20-30 times more effective, and 4) the limited cytotoxic effect of cisplatin in vivo may be due to the low area under the concentration times the time curve achieved in vivo and not due to intrinsic cell resistance.
AB - The cytotoxicity of cisplatin and cisdiammine-1,1-cyclobutane dicarboxylate (CBDCA) was examined using the MGH-U1 human bladder carcinoma cell line, grown as monolayer cultures, multicellular tumor spheroid(s) (MTS), and xenografts in immune-deprived CBA/CaJ mice. The cell survival of exponentially growing monolayers and MTS treated with cisplatin declined in a monoexponential fashion with a concentration of drug resulting in 10% colony survival (D10) of 7.75 μg/ml and 9.5 μg/ml, respectively. MTS growth delay determination demonstrated a drug concentration-dependent increase in growth delay and a correlation between decreasing surviving fraction and increasing growth delay. In vivo treatment of MGH-U1 xenografts with cisplatin caused a modest decrease in surviving fraction although the xenografted cells treated in vitro demonstrated the same sensitivity to cisplatin as those cells maintained continuously in vitro. The D10 for CBDCA treatment was 246 μg/ml for exponentially growing monolayer cells and 196 μg/ml for MTS. Growth delay studies with CBDCA showed a concentration-dependent increase in spheroid growth delay and a correlation between decreasing surviving fraction and growth delay similar to cisplatin. The conclusions were that 1) cisplatin and CBDCA did not have any difficulty penetrating into spheroids, 2) both agents appeared to be active against the noncycling poorly nourished cells found near the necrotic center of spheroids, 3) both cisplatin and CBDCA were cytotoxic toward MGH-U1 cells but cisplatin was 20-30 times more effective, and 4) the limited cytotoxic effect of cisplatin in vivo may be due to the low area under the concentration times the time curve achieved in vivo and not due to intrinsic cell resistance.
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M3 - Article
C2 - 3897683
AN - SCOPUS:0022183581
SN - 0027-8874
VL - 75
SP - 499
EP - 505
JO - Journal of the National Cancer Institute
JF - Journal of the National Cancer Institute
IS - 3
ER -