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Published in: Cancer Cell International 1/2013

Open Access 01-12-2013 | Review

Acidic extracellular microenvironment and cancer

Authors: Yasumasa Kato, Shigeyuki Ozawa, Chihiro Miyamoto, Yojiro Maehata, Atsuko Suzuki, Toyonobu Maeda, Yuh Baba

Published in: Cancer Cell International | Issue 1/2013

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Abstract

Acidic extracellular pH is a major feature of tumor tissue, extracellular acidification being primarily considered to be due to lactate secretion from anaerobic glycolysis. Clinicopathological evidence shows that transporters and pumps contribute to H+ secretion, such as the Na+/H+ exchanger, the H+-lactate co-transporter, monocarboxylate transporters, and the proton pump (H+-ATPase); these may also be associated with tumor metastasis. An acidic extracellular pH not only activates secreted lysosomal enzymes that have an optimal pH in the acidic range, but induces the expression of certain genes of pro-metastatic factors through an intracellular signaling cascade that is different from hypoxia. In addition to lactate, CO2 from the pentose phosphate pathway is an alternative source of acidity, showing that hypoxia and extracellular acidity are, while being independent from each other, deeply associated with the cellular microenvironment. In this article, the importance of an acidic extracellular pH as a microenvironmental factor participating in tumor progression is reviewed.
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Metadata
Title
Acidic extracellular microenvironment and cancer
Authors
Yasumasa Kato
Shigeyuki Ozawa
Chihiro Miyamoto
Yojiro Maehata
Atsuko Suzuki
Toyonobu Maeda
Yuh Baba
Publication date
01-12-2013
Publisher
BioMed Central
Published in
Cancer Cell International / Issue 1/2013
Electronic ISSN: 1475-2867
DOI
https://doi.org/10.1186/1475-2867-13-89

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