INTERACTION OF CULTURED MAMMALIAN-CELLS WITH WR-2721 AND ITS THIOL, WR-1065 - IMPLICATIONS FOR MECHANISMS OF RADIOPROTECTION
INTERACTION OF CULTURED MAMMALIAN-CELLS WITH WR-2721 AND ITS THIOL, WR-1065 - IMPLICATIONS FOR MECHANISMS OF RADIOPROTECTION
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DOI：
10.1080/09553008314550611
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发表时间：
1983-01-01
影响因子：
2.6
通讯作者：
LABELLE, JL
中科院分区：
文献类型：
--
作者：
PURDIE, JW;INHABER, ER;LABELLE, JL
An isothermal microcalorimeter was used to measure changes in heat flow when radioprotective drugs were added to cultured mammalian cells [human kidney T-cells]. The heat produced when WR-2721 was added continued for at least 90 min. WR-2721 was dephosphorylated by the cells to thiol (WR-1065) which oxidizes to disulfide. In the microcalorimeter, thiols give an immediate burst of heat due to this oxidation. A biological O2 monitor revealed that WR-1065 and cysteamine rapidly consumed all the O2 in culture medium. (10 mM WR-1065 deoxygenated medium in 2 min.) Rapid consumption of O2 by radioprotective thiols indicates that they will not co-exist with O2 for long in cells. This has 2 important implications with respect to mechanisms of radioprotection: O2 in tissues will be consumed rapidly and could result in local hypoxia; and, at modest doses of protective agents, the thiol will be consumed in oxic cells and hence very little will be available for reactions such as hydrogen donation. Anoxia is probably the principal mechanism of protection by aminothiols in mammals and aerated cells. This has major implications for clinical applications of radioprotectors, and these are discussed.
