Cytotoxic activity of gemcitabine and correlation with expression profile of drug-related genes in human lymphoid cells.
Pharmacol Res
; 55(4): 343-9, 2007 Apr.
Article
en En
| MEDLINE
| ID: mdl-17296311
ABSTRACT
Gemcitabine is an inhibitor of ribonucleotide reductase (RR) and DNA polymerization with promising activity in hematologic malignancies. Gemcitabine enters the cell mostly via the human equilibrative nucleoside transporter-1 (hENT1), while drug metabolism occurs by phosphorylation by deoxycytidine kinase (dCK), 5'-nucleotidase (cN-II) and cytidine deaminase (CDA) are the main inactivating enzymes. The aim of this study was to investigate the role of these determinants in gemcitabine cytotoxicity and analyze their expression in lymphoid cells. Cytotoxicity was assessed by MTT, and modulated by simultaneous addition of 2'-deoxycytidine (dCK natural substrate), tetrahydrouridine (CDA competitive inhibitor) and diethylpyrocarbonate (cN-II non-competitive inhibitor), while the expression of hENT1, dCK, cN-II, CDA and RR in WIL2-S, Jurkat and CCRF-CEM cells as well as in lymphoid cells from 25 chronic lymphocytic B-leukemia (B-CLL) patients was studied with quantitative-PCR. Cell cycle modulation and induction of apoptosis were analyzed by cytofluorimetry and bisbenzimide staining. Gemcitabine was highly cytotoxic, increased the cells in S-phase and significantly enhanced apoptosis. The crucial role of metabolism in gemcitabine activity was confirmed by the significant modulation of cytotoxicity by inhibitors of dCK, CDA and cN-II. Furthermore, PCR demonstrated a correlation between gemcitabine sensitivity and expression of its determinants, and that their values were within those observed in patients. These data indicate that gemcitabine is cytotoxic against lymphoid cells, affecting cell cycle and apoptosis. Furthermore, chemosensitivity may be predicted on the basis of gene expression profile of critical determinants involved in gemcitabine mechanism of action, suggesting the use of pharmacogenetic profiling for treatment optimization.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Leucemia Linfocítica Crónica de Células B
/
Regulación Enzimológica de la Expresión Génica
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Regulación Neoplásica de la Expresión Génica
/
Ciclo Celular
/
Apoptosis
/
Desoxicitidina
/
Antimetabolitos Antineoplásicos
Tipo de estudio:
Evaluation_studies
/
Prognostic_studies
Idioma:
En
Revista:
Pharmacol Res
Asunto de la revista:
FARMACOLOGIA
Año:
2007
Tipo del documento:
Article
País de afiliación:
Italia