Presence of circadian oscillation of multidrug resistance gene 1 in KB-C2 cell line

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Abstract

Many physiological, biochemical and behavioral processes are under circadian regulation, which is generated by an internal time-keeping mechanism referred to as biological clock in almost all organisms from bacteria to mammals. Although the substantial evidences that the circadian clock could modulate the morbidity and efficacy of anticancer therapy have been proposed, underlying mechanisms for chronotherapy has been only poorly elucidated, and it has not been popular in clinic. The aim of this study was to determine the relationship between the expression of P-glycoprotein (P-gp)/MDR1, which is one of the important molecules in anti-cancer drug resistance, and circadian rhythm in KB-C2 cells. The present study demonstrated that both MDR1 expression level and its promoter activity oscillated after treatment with high concentration of fetal bovine serum. Moreover, cytotoxic effect of taxol were dependent on the fluctuated levels of MDR1. These results suggest that the circadian rhythm of MDR1 may have an influential effect on cytotoxicity of anti-cancer drug and could be available for chemotherapy in clinic.

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Sassa, M., Koyama, Y., Higashimoto, M., Ono, K., Yoshimoto, N., Momma, T., … Takenoshita, S. (2010). Presence of circadian oscillation of multidrug resistance gene 1 in KB-C2 cell line. Annals of Cancer Research and Therapy, 18(1), 13–18. https://doi.org/10.4993/acrt.18.13

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