Doxorubicin-induced suppression of poly(ADP-ribose) polymerase-1 (PARP-1) activity and expression and its implication for PARP inhibitors in clinical trials.
Cancer Chemother Pharmacol
; 66(4): 807-12, 2010 Sep.
Article
en En
| MEDLINE
| ID: mdl-20490796
ABSTRACT
PURPOSE:
Monozygotic twins provide an excellent tool to study environmental effects on human health. Poly(ADP-ribose) polymerase-1 (PARP-1) is an important enzyme primarily involved in DNA repair and genomic stability and is under clinical investigation as a target for anticancer therapy. As a part of a PARP pharmacogenetics study, elderly male monozygotic twins, one healthy and the other with a Trojani grade 3 sarcoma treated with doxorubicin (DOX 142.5 mg/m(2)), were recruited for the study.METHODS:
PARP activity and expression were measured in peripheral blood mononuclear cells (PBMCs) by methods validated to GCLP standard and used as a pharmacodynamic endpoint for clinical trials.RESULTS:
The mean PARP activity for the patient before treatment was 160 pmol PAR/10(6) cells and was similar to that of his brother (130 pmol PAR/10(6) cells). There was approximately ninefold decrease (P = 0.001) in PARP activity in a second sample from the patient taken 21 days after the first DOX administration (17 pmol PAR/10(6) cells) and a decrease in PARP-1 expression. Investigations into BALB/C mice revealed that DOX treatment (5 mg/kg) resulted in a significant transient decrease in PARP activity after 1 h (63% control, P << 0.05) and 24 h (53% control, P << 0.05) but that PARP activity was restored 1 week after DOX treatment (86% control, P = 0.24).CONCLUSIONS:
We showed here that administration of DOX can have a profound effect on the measured level of PARP activity and expression in PBMCs from patients and animals. Results obtained in clinical trials where PARP activity is used as a pharmacodynamic marker of PARP inhibition could reflect the effect of a chemotherapeutic on PBMCs rather than the effectiveness of a tested PARP inhibitor.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Doxorrubicina
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Inhibidores Enzimáticos
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Inhibidores de Poli(ADP-Ribosa) Polimerasas
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Antibióticos Antineoplásicos
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Antineoplásicos
Límite:
Aged
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Animals
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Humans
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Male
Idioma:
En
Revista:
Cancer Chemother Pharmacol
Año:
2010
Tipo del documento:
Article
País de afiliación:
Reino Unido