Lack of reduction of thymidine kinase activity in stavudine-treated HIV-infected patients.
AIDS Res Hum Retroviruses
; 20(7): 701-3, 2004 Jul.
Article
in En
| MEDLINE
| ID: mdl-15307913
ABSTRACT
It has been demonstrated that prolonged in vivo or in vitro treatment with some nucleosides analogs may favor the selection of cells with a reduced activity of enzymes involved in the phosphorylation of these drugs leading to a reduced sensitivity to their antiretroviral action. The aim of this study was to evaluate the effect, in vivo, of zidovudine and stavudine treatment on thymidine kinase (TK) activity. The results obtained showed that TK levels in PBMC from naive patients and stavudine-treated patients did not significantly differ (naive TK = 4.16 +/- 1.19 U/mg protein; stavudine TK = 3.65 +/- 1.73 U/mg protein; p = 0.42), suggesting that the treatment with this nucleoside analog is not associated to a defect of TK activity. On the contrary, PBMC from zidovudine-treated patients showed a significant reduction in TK activity compared to naive patients (naive TK = 4.16 +/- 1.19 U/mg protein; zidovudine TK = 2.70 +/- 1.54; p = 0.014. Although the clinical significance of these results has to be established, we can speculate that stavudine and zidovudine, which are presumably phosphorylated by the same cellular kinases, might display a different ability to in vivo select cells with a resistant phenotype.
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Collection:
01-internacional
Health context:
2_ODS3
Database:
MEDLINE
Main subject:
Thymidine Kinase
/
HIV Infections
/
Stavudine
/
Anti-HIV Agents
Limits:
Humans
Language:
En
Journal:
AIDS Res Hum Retroviruses
Year:
2004
Document type:
Article