Theoretical predictions of lactate and hydrogen ion distributions in tumours.

Theoretical predictions of lactate and hydrogen ion distributions in tumours.
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DOI:
10.1371/journal.pone.0072020
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Webb SD
Webb SD
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Al-Husari M;Webb SD

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高水平的乳酸和H+离子在某些肿瘤的侵袭和转移级联中起重要作用。我们开发了一个细胞pH调节的数学模型,重点是Na+/H+交换器(NHE)和乳酸/H+同向转运体(MCT)的活动,以研究胞外乳酸和H+-离子的空间相关性。我们强调血管灌注率在确定这两个阳离子之间的空间相关性的关键作用。我们还预测了血液乳酸,MCT和NHE的活性对肿瘤中细胞pH梯度方向的关键作用。我们还将实验确定的NHE和MCT转运蛋白的异质性分布。我们表明,这可以引起更高的细胞内pH值和更低的细胞内乳酸,但不影响反向细胞pH梯度或质子重新分配远离糖酵解源的方向。另一方面,在我们的模型中包括细胞间间隙连接通讯可以引起逆转的细胞pH梯度,并且可以影响pH水平。
High levels of lactate and H+-ions play an important role in the invasive and metastatic cascade of some tumours. We develop a mathematical model of cellular pH regulation focusing on the activity of the Na+/H+ exchanger (NHE) and the lactate/H+ symporter (MCT) to investigate the spatial correlations of extracellular lactate and H+-ions. We highlight a crucial role for blood vessel perfusion rates in determining the spatial correlation between these two cations. We also predict critical roles for blood lactate, the activity of the MCTs and NHEs on the direction of the cellular pH gradient in the tumour. We also incorporate experimentally determined heterogeneous distributions of the NHE and MCT transporters. We show that this can give rise to a higher intracellular pH and a lower intracellular lactate but does not affect the direction of the reversed cellular pH gradient or redistribution of protons away from the glycolytic source. On the other hand, including intercellular gap junction communication in our model can give rise to a reversed cellular pH gradient and can influence the levels of pH.
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