Conjunctive therapy of cisplatin with the OCT2 inhibitor cimetidine: influence on antitumor efficacy and systemic clearance.

Conjunctive therapy of cisplatin with the OCT2 inhibitor cimetidine: influence on antitumor efficacy and systemic clearance.
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DOI:
10.1038/clpt.2013.145
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发表时间:
2013-11
影响因子:
6.7
通讯作者:
--
中科院分区:
医学2区
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有机阳离子转运蛋白2(OCT 2)调节近端小管中顺铂的摄取,抑制OCT 2可防止严重的顺铂诱导的肾毒性。然而,它仍然不确定是否有效的OCT 2抑制剂,如西咪替丁可以影响顺铂的抗肿瘤特性和/或处置。使用一系列临床前试验,我们发现西咪替丁对高OCT 2 mRNA水平的卵巢癌细胞(IGT-1)中顺铂的摄取和细胞毒性没有影响。此外,顺铂的抗肿瘤疗效在小鼠携带的脱氢酶标记的IGF 3 -1异种移植物不受西咪替丁(P = 0.39)。在18例接受顺铂(100 mg/m2)联合或不联合西咪替丁(800 mg×2)的患者中,以随机交叉方式获得的数据显示,西咪替丁未改变未结合顺铂的暴露,这是抗肿瘤疗效的标志物(4.37 vs 4.38 μg×h/mL; P = 0.86)。这些结果支持OCT 2抑制剂作为顺铂诱导的肾毒性的特异性调节剂的未来临床探索。
The organic cation transporter 2 (OCT2) regulates uptake of cisplatin in proximal tubules and inhibition of OCT2 protects against severe cisplatin-induced nephrotoxicity. However, it remains uncertain whether potent OCT2 inhibitors such as cimetidine can influence the antitumor properties and/or disposition of cisplatin. Using an array of preclinical assays, we found that cimetidine had no effect on the uptake and cytotoxicity of cisplatin in ovarian cancer cells with high OCT2 mRNA levels (IGROV-1). Moreover, the antitumor efficacy of cisplatin in mice bearing luciferase-tagged IGROV-1 xenografts was unaffected by cimetidine (P = 0.39). Data obtained in 18 patients receiving cisplatin (100 mg/m2) in a randomized crossover fashion with or without cimetidine (800 mg×2) revealed that cimetidine did not alter exposure to unbound cisplatin, a marker of antitumor efficacy (4.37 vs 4.38 μg×h/mL; P = 0.86). These results support the future clinical exploration of OCT2 inhibitors as specific modifiers of cisplatin-induced nephrotoxicity.
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