Na⁺/H⁺ antiporter (NHE1) and lactate/H⁺ symporters (MCTs) in pH homeostasis and cancer metabolism

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• 作者：Laurent Counillon^a ; ^b ; ^{Laurent.Counillon@unice.fr" class="auth_mail" title="E-mail the corresponding author} ; Yann Bouret^c ; Ibtissam Marchiq^d ; Jacques Pouyssé ; gur^d ; ^e ; ^{pouysseg@unice.fr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Membrane transporters ; NHE1 ; Lactate transporters ; MCTs ; pH regulation ; Cancer ; Mathematical model
• 刊名：Biochimica et Biophysica Acta (BBA)-Molecular Cell Research
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：1863
• 期：10
• 页码：2465-2480
• 全文大小：1302 K

文摘

The Na⁺/H⁺-exchanger NHE1 and the monocarboxylate transporters MCT1 and MCT4 are crucial for intracellular pH regulation, particularly under active metabolism. NHE1, a reversible antiporter, uses the energy provided by the Na⁺ gradient to expel H⁺ ions generated in the cytosol. The reversible H⁺/lactate⁻ symporters MCT1 and 4 cotransport lactate and proton, leading to the net extrusion of lactic acid in glycolytic tumors. In the first two sections of this article we review important features and remaining questions on the structure, biochemical function and cellular roles of these transporters. We then use a fully-coupled mathematical model to simulate their relative contribution to pH regulation in response to lactate production, as it occurs in highly hypoxic and glycolytic tumor cells. This article is part of a Special Issue entitled: Mitochondrial Channels edited by Pierre Sonveaux, Pierre Maechler and Jean-Claude Martinou.