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Immunohistolocalization and Gene Expression of the Carbonic Anhydrase Isoenzymes (CA‐II and CA‐VI) in Glands Associated with the Canine Lacrimal Apparatus

Cytosolic and secretory carbonic anhydrase isoenzymes (CA‐II and CA‐VI, respectively) were detected by immunohistolocalization using specific canine CA‐II and CA‐VI antisera. CA‐II and CA‐VI were identified in glands associated with the canine lacrimal apparatus, such as lacrimal gland, superficial gland of the third eyelid (third eyelid gland) and tarsal gland. CA‐II and CA‐VI mRNA signals were also detected by reverse‐transcriptase polymerase chain reaction in the same tissues. Some serous acinar cells and duct segments in the lacrimal gland and serous acinar cells in the third eyelid gland were immunopositive for anti‐CA‐II and CA‐VI antisera. In particular, some immunopositive acini to CA‐II and CA‐VI on the edge of the third eyelid gland are histologically similar to sebaceous gland cells. Sebaceous gland cells in the tarsal and ciliary glands also showed immunopositivity to both CA antisera. CA‐II and CA‐VI gene transcripts were detected in the same regions. These results suggest that secreted CA‐VI may form together with cytosolic CA‐II, a high‐activity isozyme mostly considered as a bicarbonate producer, in a mutually complementary system for the maintenance of bicarbonate levels to regulate pH in tear fluid and protect the corneal epithelia against injuries. In sebaceous gland cells in the lacrimal apparatus, CA‐VI may be related to lipogenesis in an unknown function.