Abstract
The immunohistolocalization of secretory carbonic anhydrase isoenzymes (CA-VI) in canine salivary glands, parotid, submandibular, sublingual and zygomatic glands, oral and oesophageal mucosa was studied using a specific antiserum against a canine CA-VI. In addition, the gene expression of CA-VI from the same tissue was studied using a real-time reverse-transcriptase polymerase chain reaction. In all salivary glands and oesophageal gland, immunostaining intensely localized CA-VI antiserum throughout the cytoplasm of serous acinar cells, including serous demilune and ductal epithelial cells. In contrast, no immunoreaction localized CA-VI in the mucous acinar cells of the gland. CA-VI gene transcripts were also detected in the same areas. The physiological significance of secretory CA-VI in the oral and oesophageal cavity is thought to play a highly specialized role in the maintenance of bicarbonate level in saliva and to protect mucosa from acid injury. It is shown that the major sites of the CA-VI secretion in dogs were in serous (demilune) secretory cells in all four major salivary glands and oesophageal glands in particular.
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