Oxygen dependence for chemosensitization by misonidazole.

Oxygen dependence for chemosensitization by misonidazole.
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米索硝唑化疗增敏的氧依赖性。

DOI:
10.1038/bjc.1986.262
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发表时间:
1986
影响因子:
8.8
通讯作者:
Pirro,JP
Pirro,JP
中科院分区:
医学1区
文献类型:
--
作者:
Roizin-Towle,L;Hall,EJ;Pirro,JP

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咪唑(MISO)增强某些化疗药物的细胞杀伤作用,但仅在低氧条件下。本研究的目的是利用体外培养的哺乳动物细胞,确定MISO发生化学增敏的氧气浓度范围,并将其与放射增敏所需的氧气水平进行比较。贴在高氯氧片上的V-79仓鼠细胞在已知浓度的氧气(低于10ppm到200000ppm)下充气,在暴露于化疗药物马法兰之前,用1和5 mM的味精处理4小时。在一系列平行的实验中,在相同的放气条件下,用不同氧浓度的不同剂量的X射线照射细胞。确定最大效应一半的K因子,即氧浓度,对放射增敏约为4776ppm,对MISO的化学增敏约为400ppm。显然,与放射增敏相比,MISO的化疗增敏需要更严格的低氧水平。
Misonidazole (MISO) potentiates the cell killing effect of certain chemotherapy agents, but only under hypoxic conditions. The purpose of the present study was to define the range of oxygen concentrations over which chemosensitization by MISO takes place using mammalian cells cultured in vitro, and to compare this with the oxygen levels required for radiosensitization. V-79 hamster cells, attached to permanox dishes, were gassed with known concentrations of oxygen (less than 10 to 200,000 ppm) and treated with 1 and 5 mM MISO for 4 h previous to exposure to the chemotherapy agent, melphalan. In a parallel series of experiments, under the same gassing conditions, cells were irradiated with graded doses of X-rays at various oxygen concentrations. The K factor ie the oxygen concentration which defined half the maximum effect was found to be approximately 4776 ppm for radiosensitization and approximately 400 ppm for chemosensitization by MISO. It is evident that a significantly more stringent level of hypoxia is required for chemosensitization by MISO to take place than for radiosensitization.
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DOI: 10.1016/0360-3016(84)90510-8
发表时间: 1984
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