In vitro toxicity of Pt-191-labeled cisplatin to a human cervical carcinoma cell line (ME-180)

Citation
J. Areberg et al., In vitro toxicity of Pt-191-labeled cisplatin to a human cervical carcinoma cell line (ME-180), INT J RAD O, 46(5), 2000, pp. 1275-1280
Citations number
10
Categorie Soggetti
Radiology ,Nuclear Medicine & Imaging","Onconogenesis & Cancer Research
Journal title
INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS
ISSN journal
03603016 → ACNP
Volume
46
Issue
5
Year of publication
2000
Pages
1275 - 1280
Database
ISI
SICI code
0360-3016(20000315)46:5<1275:IVTOPC>2.0.ZU;2-W
Abstract
Purpose: The aim of the present work was to examine the effect of Pt-191-ci splatin, and to study the manner in which radiation and cisplatin interact, in a human cervical carcinoma cell line (ME-180). Methods and Materials: The cells were incubated for 1 hour with nonradioact ive cisplatin or Pt-191-cisplatin with specific activities in the range 48- 167 MBq/mg, The surviving fraction of the cells after 7 days' growth was de termined with a nonclonogenic tetrazolium-based (MTT) assay. The uptake of platinum into the cell and the amount of platinum bound to DNA was measured . Results: The 50% inhibition concentration (IC50) decreased with increasing specific activity of the Pt-191-cisplatin, For the specific activities 0 (n onradioactive), 48, 89, 143, 157, and 167 MBq/mg, IC50 was found to be 3.24 +/- 0.08, 2.77 +/- 0.55, 2.17 +/- 0.34, 1.15 +/- 0.04, 1.02 +/- 0.03, and 0.76 +/- 0.13 respectively. Isobologram analysis showed a supra-additive (s ynergistic) interaction between the radiotoxicity and chemotoxicity for spe cific activities over 100 MBq/mg. Conclusion: The cytotoxic effect of cisplatin may be enhanced by labeling t he drug with the radionuclide Pt-191. (C) 2000 Elsevier Science Inc.