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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Immunolocalization of Na-K-ATPase, Na-K-Cl and Na-glucose cotransporters in the conjunctival epithelium.

PURPOSE: To investigate possible regional expression of transport systems in the conjunctival epithelium given distinct differences in morphological appearance between the bulbar and palpebral epithelia as well as variations found in the proportions of Na absorptive versus Cl secretory activities in electrophysiological studies. METHODS: Mouse monoclonal antibodies against the alpha1-subunit of Na-K-ATPase and Na-K-Cl cotransporter (NKCC1) and a rabbit polyclonal antibody against the Na-glucose cotransporter (SGLT1) were used in immunoblotting and immunofluorescent labeling of frozen fixed sections isolated from either the bulbar and palpebral regions of the conjunctiva. RESULTS: Western blot analysis clearly demonstrated the presence of Na-K-ATPase, NKCC1 and SGLT1 proteins in both bulbar and palpebral conjunctiva. Indirect immunofluorescence studies on bulbar and palpebral conjunctival portions revealed intense staining by the anti-NKCC1 and anti-alpha1-Na-K-ATPase antibodies exclusively at the basolateral surfaces, whereas the anti-SGLT1 antibody was used with porcine conjunctiva to elicit strong and unambiguous staining along the apical plasma membrane. CONCLUSIONS: Proteins that mediate the transport activities of the Na-K-ATPase and Na-K-Cl cotransporter are uniformly distributed throughout the palpebral and bulbar regions of the rabbit conjunctival epithelium. Although the Na-glucose cotransporter could be detected in immunoblots of the rabbit, this cotransporter appears to be uniformly distributed as well, based upon immunohistochemical sections of the pig conjunctiva. Thus, it appears likely that mechanisms for Cl secretion and Na absorption reside in both bulbar and palpebral segments of the conjunctival epithelium.[1]

References

  1. Immunolocalization of Na-K-ATPase, Na-K-Cl and Na-glucose cotransporters in the conjunctival epithelium. Turner, H.C., Alvarez, L.J., Bildin, V.N., Candia, O.A. Curr. Eye Res. (2000) [Pubmed]
 
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