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Overexpression of carbonic anhydrase‐related protein VIII in human colorectal cancer
Author(s) -
Miyaji Eiki,
Nishimori Isao,
Taniuchi Keisuke,
Takeuchi Tamotsu,
Ohtsuki Yuji,
Onishi Saburo
Publication year - 2003
Publication title -
the journal of pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.964
H-Index - 184
eISSN - 1096-9896
pISSN - 0022-3417
DOI - 10.1002/path.1404
Subject(s) - immunohistochemistry , colorectal cancer , monoclonal antibody , carbonic anhydrase ii , adenoma , carcinogenesis , malignancy , antigen , epithelium , chemistry , cancer research , carbonic anhydrase , colorectal adenoma , carbonic anhydrase i , antibody , pathology , cancer , medicine , enzyme , immunology , biochemistry
Carbonic anhydrase‐related protein (CA‐RP) VIII, which is a member of the CA gene family, has been shown to have no catalytic CA activity and its biological function is still unknown. Recently, overexpression of CAs IX and XII has been reported in certain types of malignancy. To investigate a potential role for CA‐RP VIII in human colorectal epithelial carcinogenesis, colorectal tissue specimens from surgically resected adenocarcinomas ( n = 60) and endoscopically polypectomized adenomas ( n = 13) were analysed by immunohistochemistry using monoclonal antibodies to CA‐RP VIII and Ki‐67 antigen. Less than 5% of epithelial cells in normal colonic mucosae ( n = 73) were CA‐RP VIII‐positive and these were localized to the deep part of the cryptal epithelium. Increased expression of CA‐RP VIII was observed in 78% of colorectal carcinomas. An intense signal was frequently observed at the tumour invasion front and its distribution was completely different from that of Ki‐67 antigen. Colorectal adenomas also showed significant immunopositivity for CA‐RP VIII, but its expression level was much lower than in adenocarcinomas. These findings suggest that CA‐RP VIII plays a role in the process of invasion in colorectal cancer. Copyright © 2003 John Wiley & Sons, Ltd.