Ferro Suellen, Azevedo-Silva João, Casal Margarida, Côrte-Real Manuela, Baltazar Fatima, Preto Ana
CBMA- Centre of Molecular and Environmental Biology, Department of Biology, University of Minho, Campus de Gualtar, Braga, Portugal.
ICBAS - Institute of Biomedical Sciences Abel Salazar, University of Porto, Porto, Portugal.
Oncotarget. 2016 Sep 21;7(43):70639-70653. doi: 10.18632/oncotarget.12156. eCollection 2016 Oct 25.
Acetate, together with other short chain fatty acids has been implicated in colorectal cancer (CRC) prevention/therapy. Acetate was shown to induce apoptosis in CRC cells. The precise mechanism underlying acetate transport across CRC cells membrane, that may be implicated in its selectivity towards CRC cells, is not fully understood and was addressed here. We also assessed the effect of acetate in CRC glycolytic metabolism and explored its use in combination with the glycolytic inhibitor 3-bromopyruvate (3BP). We provide evidence that acetate enters CRC cells by the secondary active transporters MCT1 and/or MCT2 and SMCT1 as well as by facilitated diffusion aquaporins. CRC cell exposure to acetate upregulates the expression of MCT1, MCT4 and CD147, while promoting MCT1 plasma membrane localization. We also observed that acetate increases CRC cell glycolytic phenotype and that acetate-induced apoptosis and anti-proliferative effect was potentiated by 3BP. Our data suggest that acetate selectivity towards CRC cells might be explained by the fact that aquaporins and MCTs are found overexpressed in CRC clinical cases. Our work highlights the importance that acetate transport regulation has in the use of drugs such as 3BP as a new therapeutic strategy for CRC.
乙酸盐与其他短链脂肪酸一起被认为与结直肠癌(CRC)的预防/治疗有关。研究表明,乙酸盐可诱导CRC细胞凋亡。乙酸盐跨CRC细胞膜转运的确切机制尚未完全明确,而这一机制可能与其对CRC细胞的选择性有关,本文对此进行了探讨。我们还评估了乙酸盐对CRC糖酵解代谢的影响,并研究了其与糖酵解抑制剂3-溴丙酮酸(3BP)联合使用的效果。我们提供的证据表明,乙酸盐通过继发性主动转运体MCT1和/或MCT2以及SMCT1以及通过水通道蛋白介导的易化扩散进入CRC细胞。CRC细胞暴露于乙酸盐会上调MCT1、MCT4和CD147的表达,同时促进MCT1在质膜上的定位。我们还观察到,乙酸盐会增加CRC细胞的糖酵解表型,并且3BP可增强乙酸盐诱导的细胞凋亡和抗增殖作用。我们的数据表明,水通道蛋白和MCTs在CRC临床病例中过表达这一事实可能解释了乙酸盐对CRC细胞的选择性。我们的研究突出了乙酸盐转运调节在使用3BP等药物作为CRC新治疗策略中的重要性。
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