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- W1969870866 abstract "Transport of water and electrolytes is critical for corneal clarity. Recent studies indicate another important function of transport of ions and electrolytes – establishing wound electric fields that guide cell migration. We found chloride (Cl−) flux is a major component of the corneal wound electric current. In order to elucidate the mechanisms of Cl− transport, we studied Cl− channels and transporters in human corneal epithelial (HCE) cells. We tested a transformed human corneal epithelial cell line (tHCE), primary cultures of human corneal epithelial cells (pHCE), and human donor corneas. We first used RT-PCR to determine expression levels of mRNA of CLC (Cl− channels/transporters of CLC gene family) family members and CFTR (cystic fibrosis transmembrane conductance regulator) in HCE cells. We then confirmed protein expression and distribution of selected CLC family members and CFTR with Western blot and immunofluorescence confocal microscopy. Finally, Cl− currents were recorded with electrophysiological techniques. The mRNAs of CLC-2, CLC-3, CLC-4, CLC-5, CLC-6, and CFTR were detected in the HCE cell line. CLC-1 and CLC-7 were not detectable. Western blot and immunostaining confirmed protein expression and distribution of CLC-2, CLC-3, CLC-4, CLC-6 and CFTR in human corneal epithelium. CLC-2 preferentially labeled the apical and basal layers, while CLC-3 and CLC-4 labeled only the superficial layer. CLC-6 and CFTR labeling showed a unique gradient with strong staining in apical layers which gradually decreased towards the basal layers. Corneal endothelium was positive for CLC-2, CLC-3, CLC-4, CLC-6 and possibly CFTR. Human corneal epithelial cells demonstrated voltage dependent Cl− currents. HCE cells express functional Cl− channels and transporters. CLC-2, CLC-3, CLC-4, CLC-6, and CFTR had distinct expression patterns in human corneal epithelium. Those molecules and their distribution may play important roles in maintaining resting Cl− fluxes and in regulating Cl− flux at corneal wounds, which may be a major contributor to wound electrical signaling." @default.
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- W1969870866 date "2010-06-01" @default.
- W1969870866 modified "2023-10-18" @default.
- W1969870866 title "Chloride channels and transporters in human corneal epithelium" @default.
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- W1969870866 doi "https://doi.org/10.1016/j.exer.2010.03.013" @default.
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