ID | 30344 |
JaLCDOI | |
FullText URL | |
Author |
Mikami, Haruhiko
Hosaki, Yasuhiro
Ubuka, Toshihiko
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Abstract | L-Cysteine (5.0 mmol per kg of body weight) was intraperitoneally injected into rats fed a 25% casein or 5% casein diet. Concentrations of acidic and neutral amino acids in various tissues were determined 2 h later. In the rats fed the 25% casein diet there was a tendency for tissue amino acid and glutathione levels to be slightly lower than controls. In the 5% casein diet group, however, concentrations of tissue amino acids and glutathione generally increased after L-cysteine administration. S-(2-Hydroxy-2-carboxyethylthio)cysteine (HCETC,3-mercaptolactate-cysteine disulfide), though in trace amounts, was detected in kidney and blood plasma in the 5% casein diet group. Increases in cysteine-glutathione disulfide in liver, kidney and erythrocytes in the 5% casein diet group were considerable. These results indicate that L-cysteine was rapidly metabolized in the 25% casein diet group through the oxidative pathway, while in the 5% casein diet group, in which liver cysteine dioxygenase activity is supposed to be quite low, the oxidative metabolism of L-cysteine decreased and part of the L-cysteine was metabolized through the transaminative pathway. Administration of 15.0 mmol L-cysteine per kg of body weight to rats fed the 25% casein diet resulted in an increase in cysteine-glutathione disulfide in liver, kidney and erythrocytes, and the appearance of HCETC in blood plasma.(ABSTRACT TRUNCATED AT 250 WORDS) |
Keywords | cysteine
mercaptolactate-cysteine disulfide
cysteine-glutathione disulfide
oxidative pathway
transaminative pathway
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Amo Type | Article
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Publication Title |
Acta Medica Okayama
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Published Date | 1984-10
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Volume | volume38
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Issue | issue5
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Publisher | Okayama University Medical School
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Start Page | 415
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End Page | 421
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ISSN | 0386-300X
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NCID | AA00508441
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Content Type |
Journal Article
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language |
English
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File Version | publisher
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Refereed |
True
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PubMed ID | |
Web of Science KeyUT |