In vivo,synergestic inhibition of MAT-LyLu rat prostatic adenocarcinoma growth by polyamine deprivation and low-dose cyclophosphamide |
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Authors: | B. Cipolla Y. Blanchard L. Chamaillard V. Quernener F. Guillé R. Havouis J. -P. Moulinoux |
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Affiliation: | (1) Service d'Urologie, CHU de Rennes, Hôpital de Pontchaillou, F-35033 Rennes Cedex, France;(2) Groupe de Recherche en Thérapcutique Anticancéreuse, URA CNRS 1529, Faculté de Médecine, 2, avenue du Pr Léon Bernard, F-35043 Rennes Cedex, France;(3) Centre Regional de Lutte Contre le Cancer, Avenue de la bataille Flandres-Dunkerque, BP 6279, F-35062 Rennes Cedex, France |
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Abstract: | Polyamine deprivation in vivo produces significant tumor growth inhibition of the hormone-resistant, metastatic Dunning Mat-LyLu murine prostatic carcinoma. In order to produce a cytotoxic effect in addition to the cytostatic effect of polyamine deprivation, various chemotherapy regimens, combined with drug-containing polyamine-deficient chow (DC-PDC), were assessed. Triple chemotherapy combining methotrexate, cyclophosphamide and vindesine; and monochemotherapy with high-dose cyclophosphamide (90 mg· kg-1) and low-dose cyclophosphamide (20 mg·kg-1) were studied alone and in combination with DC-PDC. A variant of DC-PDC excluding the polyamine oxidase inhibitor MDL 72527 was also studied in combination with low-dose cyclophosphamide. The triple-chemotherapy regimen alone or in combination with polyamine ceprivation was effective on tumor growth inhibition but was also toxic. High-dose cyclophosphamide alone produced significant tumor growth inhibition and an increase in life span. High-dose cyclophosphamide in combination with DC-PDC was also effective on tumor growth but was also toxic. Low-dose cyclophosphamide alone was moderately effective on tumor growth inhibition with a marginal increase in life span. When combined with polyamine deprivation, results with low-dose cyclophosphamide compared favourably with those of high-dose cyclophosphamide alone and prevented the formation of lung metastases. The polyamine oxidase inhibitor does not appear to be mandatory to achieve this effect if DC-PDC is combined with low-dose cyclophosphamide. Polyamine deprivation appears to be an important tool in anticancer therapy, allowing the use of reduced doses of cytotoxic agents with the same antitumoral efficacy. |
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Keywords: | Polyamines Prostate cancer Chemotherapy |
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