Effects of methyl mercuric chloride and sulfhydryl inhibitors on phospholipid synthetic activity of lymphocytes
作者:
Katsuhiro Kageyama,
Yasuto Onoyama,
Eiichi Kano,
期刊:
Journal of Applied Toxicology
(WILEY Available online 1986)
卷期:
Volume 6,
issue 1
页码: 49-53
ISSN:0260-437X
年代: 1986
DOI:10.1002/jat.2550060111
出版商: John Wiley&Sons, Ltd.
关键词: methyl mercuric chloride;sulfhydryl inhibitors;phospholipid synthesis;lymphocytes;cell death
数据来源: WILEY
摘要:
AbstractThe effect of methyl mercuric chloride on the activity of phospholipid synthesis of rat lymph node lymphocytes was compared with that of sulfhydryl inhibitors. Measurement of the radioactivity of [14C]oleic acid and [14C]acetate incorporated into lecithin of cells during short‐term incubation showed that all the inhibitors tested similarly reduced the incorporation. However, methyl mercuric chloride (MMC) was the strongest inhibitor, being effective at 4 μM, and causing more than 80% decrease at 20 μM. Inhibition by the sulfhydryl inhibitors, at less than 40 μM, ranked as follows:N‐ethylmaleimide>α‐chloroacetophenone>hydroquinone>iodoacetamide. MMC also obstructed the enhancement by phytohemagglutinin of [14C]oleic acid incorporation into lecithin. MMC was effective at 2 μM, while the other agents had little or no effect at this concentration. Further investigation suggested that inhibition of phospholipid synthesis did no depend on reduced incorporation of oleic acid into the cellular membrane but on decreased turnover of the fatty acid into phospholipids after the incorporation. The viability of lymphocytes incubated with the agents was measured by trypan blue dye‐exclusion test. More than 90% of the cells treated with MMC at a concentration as low as 20–40 μMdied, but the SH inhibitors, including NEM which greatly inhibited the phospholipid synthesis, produced few cell deaths at these concentrations. These observations show that the SH inhibitors affect enzymes in phospholipid synthesis, whereas MMC not only inhibits the enzymes
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