Journal
PHARMAZIE
Volume 73, Issue 2, Pages 104-109Publisher
GOVI-VERLAG PHARMAZEUTISCHER VERLAG GMBH
DOI: 10.1691/ph.2018.7116
Keywords
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Funding
- JSPS KAKENHI [JP23406005]
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The extract of Azadirachta indica, commonly known as neem, has found extensive use in traditional medicine for treating various human diseases. In this study, the effect of the 50% ethanol extract of A. indica (A101) on P-glycoprotein (P-gp)-mediated multidrug resistance (MDR) was examined using MDR cell lines, specifically paclitaxel-resistant HepG2 (PR-HepG2) and doxorubicin (DOX)-resistant (DR) colon-26 cells. 96-h treatment of the two cell lines with A101 (30 mu g/mL) showed no effect on the expression of P-gp mRNA (human MDR1 and mouse mdr1b) and protein, while A101 increased the accumulation of rhodamine 123, a P-gp substrate, in both PR-HepG2 and DR-colon-26 cells. The cytotoxic effects of 48-h treatment with A101 on the viability of PR-HepG2 and DR-colon-26 cells were not observed. Therefore, 30 mu g/mL A101 may have no cytotoxic and P-gp-inducing effects. Finally, A101 potentiated the sensitivity of PR-HepG2 and DR-colon-26 cell lines to DOX by 8.6- and 15.3-fold, respectively. These findings suggest that A. indica may be a promising source for a new class of P-gp modulators without cytotoxic/P-gp induction effects.
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