Abstract
Two cytosolic carbonic anhydrase isozymes (CA-II and CA-III) were studied by immunohistochemistry in bovine parotid glands during fetal development. In a 3-month-old fetus of crown-rump length (CRL) 17 cm, the expression of CA-II in undifferentiated epithelial cells was observed, whereas immunostaining for CA-III remained negative. At 26 cm CRL (4–5 months old), weak expression of CA-III in large ductal epithelial cells was noted. The accumulation of secreted granules in primary acinar cells was initially observed at this stage. In a newborn calf, anti-CA-II reactivity almost disappeared from most duct segments. The time-dependent expression and distribution of the isozymes in parotid glands may reflect different biological functions of these structurally closely related isozymes. Bovine parotid acinar cells of fetuses would thus appear to possess all the cellular structures and immunohistochemical properties at 4 and 5 months of gestation. CA-II subsequently disappeared from duct segments and nearly all acinar cells in adults were present at or just after birth.
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Asari, M., Miura, K., Sasaki, K. et al. Expression of carbonic anhydrase isozymes II and III in developing bovine parotid gland. Histochemistry 101, 121–125 (1994). https://doi.org/10.1007/BF00269358
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DOI: https://doi.org/10.1007/BF00269358