Your browser doesn't support javascript.
loading
Disulfiram anti-cancer efficacy without copper overload is enhanced by extracellular H2O2 generation: antagonism by tetrathiomolybdate.
Calderon-Aparicio, Ali; Strasberg-Rieber, Mary; Rieber, Manuel.
Afiliação
  • Calderon-Aparicio A; IVIC, Laboratorio de Bioquimica Celular, CMBC, Altos de Pipe, Caracas, Venezuela.
  • Strasberg-Rieber M; IVIC, Laboratorio de Bioquimica Celular, CMBC, Altos de Pipe, Caracas, Venezuela.
  • Rieber M; IVIC, Laboratorio de Bioquimica Celular, CMBC, Altos de Pipe, Caracas, Venezuela.
Oncotarget ; 6(30): 29771-81, 2015 Oct 06.
Article em En | MEDLINE | ID: mdl-26356671
BACKGROUND: Cu/Zn superoxide dismutases (SODs) like the extracellular SOD3 and cytoplasmic SOD1 regulate cell proliferation by generating hydrogen peroxide (H2O2). This pro-oxidant inactivates essential cysteine residues in protein tyrosine phosphatases (PTP) helping receptor tyrosine kinase activation by growth factor signaling, and further promoting downstream MEK/ERK linked cell proliferation. Disulfiram (DSF), currently in clinical cancer trials is activated by copper chelation, being potentially capable of diminishing the copper dependent activation of MEK1/2 and SOD1/SOD3 and promoting reactive oxygen species (ROS) toxicity. However, copper (Cu) overload may occur when co-administered with DSF, resulting in toxicity and mutagenicity against normal tissue, through generation of the hydroxyl radical (•OH) by the Fenton reaction. PURPOSE: To investigate: a) whether sub-toxic DSF efficacy can be increased without Cu overload against human melanoma cells with unequal BRAF(V600E) mutant status and Her2-overexpressing SKBR3 breast cancer cells, by increasing H2O2 from exogenous SOD; b) to compare the anti-tumor efficacy of DSF with that of another clinically used copper chelator, tetrathiomolybdate (TTM). RESULTS: a) without copper supplementation, exogenous SOD potentiated sub-toxic DSF toxicity antagonized by sub-toxic TTM or by the anti-oxidant N-acetylcysteine; b) exogenous glucose oxidase, another H2O2 generator resembled exogenous SOD in potentiating sub-toxic DSF. CONCLUSIONS: potentiation of sub-lethal DSF toxicity by extracellular H2O2 against the human tumor cell lines investigated, only requires basal Cu and increased ROS production, being unrelated to non-specific or TTM copper chelator sequestration. SIGNIFICANCE: These findings emphasize the relevance of extracellular H2O2 as a novel mechanism to improve disulfiram anticancer effects minimizing copper toxicity.
Assuntos
Palavras-chave

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Dissulfiram / Peróxido de Hidrogênio / Molibdênio / Antineoplásicos Limite: Humans Idioma: En Revista: Oncotarget Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Venezuela País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Dissulfiram / Peróxido de Hidrogênio / Molibdênio / Antineoplásicos Limite: Humans Idioma: En Revista: Oncotarget Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Venezuela País de publicação: Estados Unidos