Radiation response of human lung cancer cells with inherent and acquired resistance to cisplatin
- MRC Clinical Oncology and Radiotherapeutics Unit, Cambridge (England)
We have derived sublines of three human lung cancer cell lines with acquired resistance to cisplatin. The cisplatin resistant sublines of NCI-H69 (small cell), COR-L23 (large cell), and MOR (adenocarcinoma) show 5.3 fold, 3.1 fold, and 3.8 fold resistance, respectively, determined in a 6-day MTT assay. Although the parent lines show a wide range of glutathione content per cell, the sublines each show similar values to their corresponding parent line. Radiation response curves have been obtained using a soft agar clonogenic assay. Values obtained for the parent lines (95% CL in parentheses) were: NCI-H69: Do = 0.99 Gy (0.87-1.16), n = 2.9 (1.6-5.2), GSH = 14 ng/10(4) cells; COR-L23: Do = 1.23 Gy (1.05-1.49), n = 1.3 (0.7-2.2), GSH = 47 ng/10(4) cells; MOR: Do = 1.66 Gy (1.48-1.88), n = 3.0 (1.9-4.8), GSH = 86 ng/10(4) cells. The cisplatin resistant variants of NCI-H69 and COR-L23 showed 31% and 63% increases, respectively, in Do compared to their parent lines, whereas no change in radiation response was seen in MOR. In this panel of lines, therefore, although there is a correlation between glutathione content and radiosensitivity of the parent cell lines, acquired resistance to cisplatin is not accompanied by increased glutathione content. However, two of the three cisplatin resistant lines do show a significantly reduced radiosensitivity.
- OSTI ID:
- 6057457
- Journal Information:
- International Journal of Radiation Oncology, Biology and Physics; (USA), Vol. 20:2; ISSN 0360-3016
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANTINEOPLASTIC DRUGS
RADIOSENSITIVITY EFFECTS
LUNGS
CARCINOMAS
TUMOR CELLS
RADIOSENSITIVITY
DOSE-RESPONSE RELATIONSHIPS
GLUTATHIONE
MAN
ANIMAL CELLS
ANIMALS
BODY
DISEASES
DRUGS
MAMMALS
NEOPLASMS
ORGANIC COMPOUNDS
ORGANS
PEPTIDES
POLYPEPTIDES
PRIMATES
PROTEINS
RADIOPROTECTIVE SUBSTANCES
RESPIRATORY SYSTEM
VERTEBRATES
560120* - Radiation Effects on Biochemicals
Cells
& Tissue Culture