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Resistance to anticancer medications often leads to poor outcomes. The present study explored an effective approach for enhancing chemotherapy targeted against human cancer cells. Real-time quantitative real-time polymerase chain reaction (qRT-PCR) analysis revealed overexpression of members of aldo-keto reductase (AKR) 1C family, AKR1C1, AKR1C2, AKR1C3, and AKR1C4, in cisplatin, cis-diamminedichloroplatinum (II) (CDDP)-resistant human cancer cell lines, HeLa (cervical cancer cells) and Sa3 (oral squamous cell carcinoma cells). The genes were downregulated using small-interfering RNA (siRNA) transfection, and the sensitivity to CDDP or 5-fluorouracil (5-FU) was investigated. When the genes were knocked down, sensitivity to CDDP and 5-FU was restored. Furthermore, we found that administration of mefenamic acid, a widely used non-steroidal anti-inflammatory drug (NSAID) and a known inhibitor of AKR1Cs, enhanced sensitivity to CDDP and 5-FU. The present study suggests that AKR1C family is closely associated with drug resistance to CDDP and 5-FU, and mefenamic acid enhances their sensitivity through its inhibitory activity in drug-resistant human cancer cells. Thus, the use of mefenamic acid to control biological function of AKR1C may lead to effective clinical outcomes by overcoming anticancer drug resistance.

Mefenamic acid enhances anticancer drug sensitivity via inhibition of aldo-keto reductase 1C enzyme activity