The Potential Role of Systemic Buffers in Reducing Intratumoral Extracellular pH and Acid-Mediated Invasion

被引:159
作者
Silva, Ariosto S. [3 ]
Yunes, Jose A. [3 ]
Gillies, Robert J. [1 ,2 ]
Gatenby, Robert A. [1 ,2 ]
机构
[1] H Lee Moffitt Canc Ctr & Res Inst, Dept Radiol, Tampa, FL 33612 USA
[2] H Lee Moffitt Canc Ctr & Res Inst, Dept Integrat Math Oncol, Tampa, FL 33612 USA
[3] Ctr Infantil Boldrini, Mol Biol Lab, Sao Paulo, Brazil
关键词
POSITRON-EMISSION-TOMOGRAPHY; ENDOTHELIAL GROWTH-FACTOR; CARBONIC-ANHYDRASE-IX; HIGH LACTATE LEVELS; POOR-PROGNOSIS; SODIUM-BICARBONATE; TUMOR METABOLISM; INTERSTITIAL PH; MELANOMA-CELLS; CANCER-CELLS;
D O I
10.1158/0008-5472.CAN-08-2394
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
A number of studies have shown that the extracellular pH (pHe) in cancers is typically lower than that in normal tissue and that an acidic pHe promotes invasive tumor growth in primary and metastatic cancers. Here, we investigate the hypothesis that increased systemic concentrations of pH buffers reduce intratumoral and peritumoral acidosis and, as a result, inhibit malignant growth. Computer simulations are used to quantify the ability of systemic pH buffers to increase the acidic pHe of tumors in vivo and investigate the chemical specifications of an optimal buffer for such purpose. We show that increased serum concentrations of the sodium bicarbonate (NaHCO3) can be achieved by ingesting amounts that have been used in published clinical trials. Furthermore, we find that consequent reduction of tumor acid concentrations significantly reduces tumor growth and invasion without altering the pH of blood or normal tissues. The simulations also show that the critical parameter governing buffer effectiveness is its pK(a). This indicates that NaHCO3, with a pK(a) of 6.1, is not an ideal intratumoral buffer and that greater intratumoral pHe changes could be obtained using a buffer with a pK(a) of similar to 7. The simulations support the hypothesis that systemic pH buffers can be used to increase the tumor pHe and inhibit tumor invasion. [Cancer Res 2009;69(6):2677-84]
引用
收藏
页码:2677 / 2684
页数:8
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