Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research
Date (from‐to) : 2015/04 -2018/03
Author : Ogihara Takuo; Arakawa Hiroshi; Idota Yoko
Efflux transporters, as exemplified by P-glycoprotein (P-gp), are localized at the plasma membrane and excrete many therapeutic drugs from the cytoplasm to outside the cells. These transporters are therefore known as a major contributing factor resulting in multidrug resistance of cancer cells. Our study indicated that the regulation of transporters by scaffold proteins, such as ezrin, radixin and moesin (ERM proteins) is different between cancerous tissues. Moreover, these regulatory properties are the same as those of the corresponding normal tissues, and suggest that organ-specific differences in the regulation of P-gp by ERM proteins are retained in cancerous tissues. Furthermore, in tissues such as lung cancer, several efflux transporters were controlled by the same one scaffold protein. Therefore, it was suggested that the suppression of a specific scaffold protein comprehensively inactivated efflux transporters in certain kinds of cancerous tissue.