Overexpression of carbonic anhydrase-related protein XI promotes proliferation and invasion of gastrointestinal stromal tumors.

Kaori Morimoto, Isao Nishimori, Tamotsu Takeuchi, Takuhiro Kohsaki, Nobuto Okamoto, Takahiro Taguchi, Shigeru Yunoki, Ryohei Watanabe, Yuji Ohtsuki, Saburo Onishi

Virchows Archiv : an international journal of pathology 2005 Jul

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Three isoforms of carbonic anhydrase-related protein (CA-RP) are evolutionally well conserved among the CA gene family but lack classical CA activity. Although the biological function of CA-RPs is unknown, overexpression of CA-RP VIII has been reported in certain tumor types. Based on the finding that CA-RPs are commonly expressed in the neuronal cells, we investigated expression of all three CA-RPs in gastrointestinal stromal tumor (GIST). In contrast to no detectable signal of any of the three CA-RPs in intestinal cells of Cajal, immunohistochemical analysis showed distinct cytoplasmic expressions of CA-RPs VIII and XI in 13 (59%) and 20 (91%) of 22 GIST tissue specimens, respectively. The positive signals for both CA-RPs VIII and XI were more intense in the periphery than in the central part of GISTs, whereas no significant signal for CA-RP X expression was observed in any of the GISTs. These expression patterns of CA-RPs were consistently observed by reverse transcription-polymerase chain reaction-Southern blot and immunocytochemistry in the cultured GIST cell line GIST-T1. Ectopic expression of CA-RP XI in GIST-T1 cells induced cell proliferation and invasion in vitro. These findings indicate that CA-RP XI plays a role in the development of GIST.

Citation

Kaori Morimoto, Isao Nishimori, Tamotsu Takeuchi, Takuhiro Kohsaki, Nobuto Okamoto, Takahiro Taguchi, Shigeru Yunoki, Ryohei Watanabe, Yuji Ohtsuki, Saburo Onishi. Overexpression of carbonic anhydrase-related protein XI promotes proliferation and invasion of gastrointestinal stromal tumors. Virchows Archiv : an international journal of pathology. 2005 Jul;447(1):66-73