Serum alkaline phosphatase (SAP) activity following exposure to cadmium and/or60CO gamma irradiation
作者:
R.M. Morgan,
Y.R. Kundomal,
E.W. Hupp,
期刊:
Journal of Environmental Science and Health . Part A: Environmental Science and Engineering
(Taylor Available online 1987)
卷期:
Volume 22,
issue 4
页码: 337-342
ISSN:0360-1226
年代: 1987
DOI:10.1080/10934528709375353
出版商: Taylor & Francis Group
关键词: Serum alkaline phosphatase (SAP);cadmium;radiation;enzymes
数据来源: Taylor
摘要:
Two hundred and sixteen male Sprague‐Dawley (S‐D) rats, 80 ± 5 days old and weighing 220–250 g each, were assigned at random to nine groups of 24 rats each. Rats were injected with cadmium (Cd) intraperitoneally every 3 days for 29 days for a total of nine injections. Injections doses were 0, 1.0, or 2.5 mg Cd kg−1body weight. Twenty‐four hours after the last Cd injection (day 30), each rat received an acute whole‐body60Co gamma radiation dose of 0, 3.62, or 5.43 Gray (Gy) at a dose rate of 3.304 Gy min‐1. Eight rats from each of 9 groups were sacrificed on day 1, 7, or 21. High dose radiation administered 24 hours following the last dosage of Cd caused significantly elevated serum alkaline phosphatase levels, whereas high dose cadmium caused the enzyme to be significantly depressed. When Cd and radiation were used as the co‐insult, the combination of high Cd‐high radiation was more effective than either cadmium or radiation alone, suggesting a previously reported cadmium metal protection against the radiation. Although the precise mechanism is unknown, we speculate that the protection afforded by cadmium against radiation might be attributed to different conformations of metal‐induced metallothionein cysteine clusters. Further, these clusters are likely dependent upon conversion between conformational forms requiring specific levels of metal ion site occupancy.
点击下载:
PDF (273KB)
返 回