Is Rabbit CLCA1 Related to the Basolateral Ca2+-Dependent Cl− Channel of Gastric Parietal Cells?
Jpn J Physiol Vol.51, No.1 pp.121-125
Abstract: An expression of mRNA coding the calcium-activated Cl− channel-1 (CLCA1) in rabbit gastric parietal cells was examined to verify the possibility that the CLCA1 mediates housekeeping Cl− channels in the basolateral membrane. In whole-cell voltage-clamp experiments of rabbit parietal cells, A23187 (2 M), a Ca2+ ionophore, activated the basolateral Cl− channels. The partial cDNA fragment of rabbit CLCA1 could be amplified from the total RNA of tracheal epithelium. A Northern blot analysis showed that rabbit CLCA1 mRNA of 3.4 kb is highly expressed in the tracheal epithelium, but not in the gastric parietal cells. Even in a more sensitive detection of rabbit CLCA1 mRNA by RT-PCR, no signal could be observed in the gastric parietal cells. These results suggest that the CLCA1 protein may not be a subunit of the housekeeping Ca2+-dependent Cl− channel in the basolateral membrane of rabbit gastric parietal cells.
Department of Pharmaceutical Physiology, Faculty of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University, Toyama, 930-0194 Japan. sakaih@ms.toyama-mpu.ac.jp
Copyright© 2007 by The Physiological Society of Japan