Investigations into mechanisms of the interaction between platinum complexes and irradiation at low (∼2 Gy) doses in hypoxic cells: I. Role of single‐strand breaks
Investigations into mechanisms of the interaction between platinum complexes and irradiation at low (∼2 Gy) doses in hypoxic cells: I. Role of single‐strand breaks
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缺氧细胞中铂配合物与低(~2 Gy)剂量照射之间相互作用的机制研究:I. 单链断裂的作用
DOI:
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发表时间:
1993
期刊:
影响因子:
--
通讯作者:
K. Skov
中科院分区:
文献类型:
--
作者:
P. Walter;M. Korbelik;I. Spadinger;K. Skov
There is a need for radiosensitizers, to be used in conjunction with fractionated radiotherapy (∼2 Gy), because of the resistance of the hypoxic portions of tumors. A marked selective interaction between cisplatin (cis-diamminedichloroplatinum (II)) and low doses of radiations was reported in hypoxic cells [Korbelik and Skov: Radiat Res 119:145–156, 1989]. A first hypothesis might be the interference with repair of radiationinduced DNA breaks by cisplatin, or vice versa. In order to study these possible mechanisms of interaction, the effects of changing the delivery time of cisplatin before and after low-dose X-irradiation of hypoxic cells were investigated. Survival after low doses of X-rays of both Chinese hamster ovary (CHO) and V79 cells growing exponentially was assessed using the Cell Analyzer for location of individual cells. In cells exposed to cisplatin (2.5 μM for 1 hr) and low doses of X-rays in hypoxia, the pronounced enhancement ratio (ER; 1.7 in CHO, 1.8 in V79) did not decrease regardless of scheduling (up to 8 hr after or 3 hr before irradiation). Since the repair of single-strand breaks (SSB) is rapid, it appears that interference with their repair is not a major contribution to the interaction. The longer-term damage (or misrepair) was examined indirectly by looking at 1) colony size: CHO cells which were irradiated with low doses of X-rays (1 Gy, hypoxia) or treated with cisplatin (2.5 μM) produced smaller colonies than controls; the data for the combined treatments are presented, and 2) chromosome aberrations in hypoxic CHO cells: the ER for exchanges agrees with the survival data. © 1993 Wiley-Liss, Inc.
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DOI:
10.1016/s0021-9258(18)42242-9
发表时间:
1992-07
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Edward N. Hughes;B. N. Engelsberg;Paul C. Billings
通讯作者:
Edward N. Hughes;B. N. Engelsberg;Paul C. Billings
影响因子:
3.4
作者:
Sun,JR;Brown,JM
通讯作者:
Brown,JM
DOI:
10.1016/0360-3016(86)90229-4
发表时间:
1986
期刊:
International journal of radiation oncology, biology, physics
影响因子:
--
作者:
Skarsgard,LD;Harrison,I;Durand,RE;Palcic,B
通讯作者:
Palcic,B
DOI:
10.1016/0360-3016(87)90320-8
发表时间:
1987
期刊:
International journal of radiation oncology, biology, physics
影响因子:
--
作者:
Tanabe,M;Godat,D;Kallman,RF
通讯作者:
Kallman,RF
影响因子:
11.2
作者:
Kanazawa,H;Rapacchietta,D;Kallman,RF
通讯作者:
Kallman,RF