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

Studies on the expression of mRNA for anion transport related proteins in corneal endothelial cells.

PURPOSE: Chloride and bicarbonate are necessary for maintenance of fluid transport by the corneal endothelium, however there is little information on the identity of anion transport proteins that could serve as anion efflux mechanisms in endothelial cells. Therefore, we ask whether mRNA for the anion transport related proteins, CFTR, CLC-2, ClC-3, ClC-5 and AE2, are expressed in human, bovine or rabbit corneal endothelium. METHODS: RT-PCR was performed for CFTR, CLC-2, ClC-3, ClC-5 and AE2 using total RNA from fresh human, bovine and rabbit corneal endothelium as well as cultured bovine corneal endothelial cells (CBCEC). Specificity of PCR products was confirmed by sequencing. RESULTS: RT-PCR analysis gave positive bands at the predicted size for CLC-3 and CLC-5 from fresh human, rabbit and bovine as well as CBCEC. However, for CLC-2, no band was apparent around the predicted size from fresh and cultured corneal endothelium. A band at the predicted size was obtained for CFTR from fresh human, rabbit and bovine endothelium, as well as from CBCEC. RT-PCR analysis for AE2 produced specific bands from fresh human, rabbit and bovine corneal endothelium, but no positive band was obtained from CBCEC. Sequencing analysis further confirmed the identities of CLC-3, CLC-5, CFTR and AE2 in corneal endothelium. CONCLUSIONS: CFTR, CLC-3 and ClC-5 are expressed in fresh and cultured corneal endothelial cells. However, consistent with previous immunoblots studies, AE2 is only expressed in fresh corneal endothelium. These results have implications for modeling possible apical anion efflux mechanisms in corneal endothelium.[1]


  1. Studies on the expression of mRNA for anion transport related proteins in corneal endothelial cells. Sun, X.C., McCutheon, C., Bertram, P., Xie, Q., Bonanno, J.A. Curr. Eye Res. (2001) [Pubmed]
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