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(American Journal of Pathology. 2001;158:905-919.)
© 2001 American Society for Investigative Pathology

Regular Articles

Expression of Hypoxia-Inducible Cell-Surface Transmembrane Carbonic Anhydrases in Human Cancer

Sergey Ivanov*{dagger}, Shu-Yuan Liao{ddagger}, Alla Ivanova*, Alla Danilkovitch-Miagkova*, Nadezhda Tarasova§, Gregor Weirich*, Marsha J. Merrill, Martin A. Proescholdt, Edward H. Oldfield, Joshua Lee*, Jan Zavada||, Abdul Waheed**, William Sly**, Michael I. Lerman* and Eric J. Stanbridge{ddagger}

From the Laboratory of Immunobiology,*
the Intramural Research Support Program,{dagger}
Science Applications International Corporation, Frederick, Maryland; the Molecular Aspects of Drug Design Section,§
National Cancer Institute, Frederick Cancer Research and Development Center, Frederick, Maryland; the Surgical Neurology Branch,
National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland; the Department of Microbiology and Molecular Genetics,{ddagger}
College of Medicine, University of California at Irvine, Irvine, California; the St. Louis University School of Medicine,**
St. Louis, Missouri; and the Academy of Sciences,||
Prague, Czech Republic

An acidic extracellular pH is a fundamental property of the malignant phenotype. In von Hippel-Lindau (VHL)-defective tumors the cell surface transmembrane carbonic anhydrase (CA) CA9 and CA12 genes are overexpressed because of the absence of pVHL. We hypothesized that these enzymes might be involved in maintaining the extracellular acidic pH in tumors, thereby providing a conducive environment for tumor growth and spread. Using Northern blot analysis and immunostaining with specific antibodies we analyzed the expression of CA9 and CA12 genes and their products in a large sample of cancer cell lines, fresh and archival tumor specimens, and normal human tissues. Expression was also analyzed in cultured cells under hypoxic conditions. Expression of CA IX and CA XII in normal adult tissues was detected only in highly specialized cells and for most tissues their expression did not overlap. Analysis of RNA samples isolated from 87 cancer cell lines and 18 tumors revealed high-to-moderate levels of expression of CA9 and CA12 in multiple cancers. Immunohistochemistry revealed high-to-moderate expression of these enzymes in various normal tissues and multiple common epithelial tumor types. The immunostaining was seen predominantly on the cell surface membrane. The expression of both genes was markedly induced under hypoxic conditions in tumors and cultured tumor cells. We conclude that the cell surface trans-membrane carbonic anhydrases CA IX and CA XII are overexpressed in many tumors suggesting that this is a common feature of cancer cells that may be required for tumor progression. These enzymes may contribute to the tumor microenvironment by maintaining extracellular acidic pH and helping cancer cells grow and metastasize. Our studies show an important causal link between hypoxia, extracellular acidification, and induction or enhanced expression of these enzymes in human tumors.




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