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  • Title: Marked depletion of the water-channel protein, AQP5, in the canine nictitating membrane glands might contribute to the development of KCS.
    Author: Terakado K, Yogo T, Kohara Y, Soeta S, Nezu Y, Harada Y, Hara Y, Amasaki H, Tagawa M.
    Journal: Vet Pathol; 2013 Jul; 50(4):664-7. PubMed ID: 23160543.
    Abstract:
    The objectives of this study were to investigate the normal histological localization of aquaporin (AQP) 5 protein in the lacrimal and nictitating membrane glands and to compare this localization in healthy and keratoconjunctivitis sicca (KCS) dogs. Lacrimal and nictitating membrane glands of 5 healthy Beagles and nictitating membrane glands of 5 KCS dogs (3 Beagles and 2 mongrel dogs: 0-13 years) were used for the present study. The owners of the KCS dogs did not consent to perform biopsies of the lacrimal glands. The localization and distribution of AQP5 protein were investigated by an immunohistochemical technique. In immunohistochemical staining, AQP5 was localized in the apical site of acinar epithelial and ductal epithelial cells from both the lacrimal and nictitating membrane glands in healthy dogs. However, AQP5 was not detected in the 5 KCS dogs. These results for immunohistochemical AQP5 localization might correlate with the deficiency in tear secretion found in KCS dogs.
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