Data/hora: 11/06/2024 09:51:50

Provedor de dados: 	56	
País: 	Brazil	
Título: 	Collateral methotrexate resistance in cisplatin-selected murine leukemia cells	
Autores: 	Bhushan,A.; Hacker,M.P.; Tritton,T.R.	
Data: 	1999-07-01	
Ano: 	1999	
Palavras-chave: 	Methotrexate transport; Resistance; Cisplatin; Leukemia; Phosphorylation.	
Resumo: 	Resistance to anticancer drugs is a major cause of failure of many therapeutic protocols. A variety of mechanisms have been proposed to explain this phenomenon. The exact mechanism depends upon the drug of interest as well as the tumor type treated. While studying a cell line selected for its resistance to cisplatin we noted that the cells expressed a &amp;gt;25,000-fold collateral resistance to methotrexate. Given the magnitude of this resistance we elected to investigate this intriguing collateral resistance. From a series of investigations we have identified an alteration in a membrane protein of the resistant cell as compared to the sensitive cells that could be the primary mechanism of resistance. Our studies reviewed here indicate decreased tyrosine phosphorylation of a protein (molecular mass = 66) in the resistant cells, which results in little or no transfer of methotrexate from the medium into the cell. Since this is a relatively novel function for tyrosine phosphorylation, this information may provide insight into possible pharmacological approaches to modify therapeutic regimens by analyzing the status of this protein in tumor samples for a better survival of the cancer patients.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000700005	
Editor: 	Associação Brasileira de Divulgação Científica	
Relação: 	10.1590/S0100-879X1999000700005	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Medical and Biological Research  v.32 n.7 1999	
Fonte: 	info:eu-repo/semantics/openAccess