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Role of residual Sb(III) in meglumine antimoniate cytotoxicity and MRP1-mediated resistance.
Chem Biol Interact. 2006 Apr 15; 160(3):217-24.CB

Abstract

Despite the clinical use of pentavalent antimonials for more than half a century, their metabolism in mammals and mechanisms of action and toxicity remain poorly understood. It has been proposed that the more active and toxic trivalent antimony form Sb(III) plays a critical role in their antileishmanial activity and toxicity. The aim of this work was to investigate the role of residual Sb(III) both in the antileishmanial/antitumoral activities of the pentavalent meglumine antimoniate and in the MRP1 (multidrug resistance-associated protein 1)-mediated resistance to this drug. Samples of meglumine antimoniate differing in their amount of residual Sb(III) (meglumine antimoniate synthesized either from SbCl(5) or from KSb(OH)(6) as well as commercially-available meglumine antimoniate) were evaluated in vitro and in vivo on Leishmania amazonensis infections, as well as for their cytotoxicity to normal and MRP1-overexpressing GLC4 cell lines. Although in vitro the two most effective drugs contained the highest levels of Sb(III), no correlation was found in vivo between the antileishmanial activity of meglumine antimoniate and its residual Sb(III) content, suggesting that residual Sb(III) contributes only marginally to the drug antileishmanial activity. On the other hand, the GLC4 cells growth inhibition data strongly suggests a marked contribution of residual Sb(III). Additionally, the potassium salt of antimoniate (non-complexed form of Sb(V)) was found to be more cytotoxic than meglumine antimoniate. Although MRP1-overexpressing GLC4 cells showed a marked resistance to trivalent antimonials, cross-resistance to meglumine antimoniate was observed only for the products that contained relatively high levels of Sb(III) (at least 0.03% by weight), suggesting that MRP1 mediates resistance to Sb(III) but not to Sb(V). In conclusion, our data strongly suggest that residual Sb(III) in pentavalent antimonial drugs does not contribute significantly to their antileishmanial activity, but is responsible for their cytotoxic activity against mammalian cells and the MRP1-mediated resistance to these drugs.

Authors+Show Affiliations

Laboratoire BioMoCeTi, UMR 7033, Université Paris Nord, 74 Rue Marcel Cachin, 93017 Bobigny, France.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16524568

Citation

Dzamitika, Simplice A., et al. "Role of Residual Sb(III) in Meglumine Antimoniate Cytotoxicity and MRP1-mediated Resistance." Chemico-biological Interactions, vol. 160, no. 3, 2006, pp. 217-24.
Dzamitika SA, Falcão CA, de Oliveira FB, et al. Role of residual Sb(III) in meglumine antimoniate cytotoxicity and MRP1-mediated resistance. Chem Biol Interact. 2006;160(3):217-24.
Dzamitika, S. A., Falcão, C. A., de Oliveira, F. B., Marbeuf, C., Garnier-Suillerot, A., Demicheli, C., Rossi-Bergmann, B., & Frézard, F. (2006). Role of residual Sb(III) in meglumine antimoniate cytotoxicity and MRP1-mediated resistance. Chemico-biological Interactions, 160(3), 217-24.
Dzamitika SA, et al. Role of Residual Sb(III) in Meglumine Antimoniate Cytotoxicity and MRP1-mediated Resistance. Chem Biol Interact. 2006 Apr 15;160(3):217-24. PubMed PMID: 16524568.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Role of residual Sb(III) in meglumine antimoniate cytotoxicity and MRP1-mediated resistance. AU - Dzamitika,Simplice A, AU - Falcão,Camila A B, AU - de Oliveira,Fernanda B, AU - Marbeuf,Carole, AU - Garnier-Suillerot,Arlette, AU - Demicheli,Cynthia, AU - Rossi-Bergmann,Bartira, AU - Frézard,Frédéric, Y1 - 2006/03/09/ PY - 2005/12/09/received PY - 2006/01/25/revised PY - 2006/01/26/accepted PY - 2006/3/10/pubmed PY - 2006/6/9/medline PY - 2006/3/10/entrez SP - 217 EP - 24 JF - Chemico-biological interactions JO - Chem Biol Interact VL - 160 IS - 3 N2 - Despite the clinical use of pentavalent antimonials for more than half a century, their metabolism in mammals and mechanisms of action and toxicity remain poorly understood. It has been proposed that the more active and toxic trivalent antimony form Sb(III) plays a critical role in their antileishmanial activity and toxicity. The aim of this work was to investigate the role of residual Sb(III) both in the antileishmanial/antitumoral activities of the pentavalent meglumine antimoniate and in the MRP1 (multidrug resistance-associated protein 1)-mediated resistance to this drug. Samples of meglumine antimoniate differing in their amount of residual Sb(III) (meglumine antimoniate synthesized either from SbCl(5) or from KSb(OH)(6) as well as commercially-available meglumine antimoniate) were evaluated in vitro and in vivo on Leishmania amazonensis infections, as well as for their cytotoxicity to normal and MRP1-overexpressing GLC4 cell lines. Although in vitro the two most effective drugs contained the highest levels of Sb(III), no correlation was found in vivo between the antileishmanial activity of meglumine antimoniate and its residual Sb(III) content, suggesting that residual Sb(III) contributes only marginally to the drug antileishmanial activity. On the other hand, the GLC4 cells growth inhibition data strongly suggests a marked contribution of residual Sb(III). Additionally, the potassium salt of antimoniate (non-complexed form of Sb(V)) was found to be more cytotoxic than meglumine antimoniate. Although MRP1-overexpressing GLC4 cells showed a marked resistance to trivalent antimonials, cross-resistance to meglumine antimoniate was observed only for the products that contained relatively high levels of Sb(III) (at least 0.03% by weight), suggesting that MRP1 mediates resistance to Sb(III) but not to Sb(V). In conclusion, our data strongly suggest that residual Sb(III) in pentavalent antimonial drugs does not contribute significantly to their antileishmanial activity, but is responsible for their cytotoxic activity against mammalian cells and the MRP1-mediated resistance to these drugs. SN - 0009-2797 UR - https://www.unboundmedicine.com/medline/citation/16524568/Role_of_residual_Sb_III__in_meglumine_antimoniate_cytotoxicity_and_MRP1_mediated_resistance_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0009-2797(06)00018-4 DB - PRIME DP - Unbound Medicine ER -