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- W1972642171 abstract "The Na+,K(+)-ATPase alpha 1, alpha 2, and alpha 3 subunit isoforms have been shown to be differentially expressed in the nonpigmented (NPE) and pigmented (PE) cells of the ocular ciliary epithelium (CE) (Martin-Vasallo et al., J. Cell. Physiol., 141:243-252, 1989; Ghosh et al., J. Biol. Chem., 265:2935-2940, 1990). In this study we analyzed and compared the pattern of expression of the multiple Na+,K(+)-ATPase alpha (alpha 1, alpha 2, alpha 3) subunit genes with the pattern of expression of the Na+,K(+)-ATPase beta (beta 1, beta 2) subunit genes along the bovine CE. We have selected three regions in the CE, referred to as 1) the anterior region of the pars plicata, near the iris; 2) the middle region of the pars plicata; and 3) the posterior region of the pars plana, near the ora serrata. Using isoform-specific cDNA probes and antibodies for the Na+,K(+)-ATPase alpha 1, alpha 2, alpha 3, beta 1, and beta 2 subunits on Northern and Western blot analysis, we found that mRNA and polypeptides are expressed in all three CE regions with different abundance. The pattern of expression of alpha and beta isoforms detected along the NPE cell layers suggests a gradient of alpha 1, alpha 2, alpha 3, beta 1, and beta 2 mRNAs and polypeptides that correlates with decreasing Na+,K(+)-ATPase activity from the most anterior region at the pars plicata towards the posterior region at the ora serrata. We also found marked differences in the pattern of immunolocalization of Na+,K(+)-ATPase alpha 1, alpha 2, alpha 3, beta 1, and beta 2 subunit isoforms in different regions of the CE. In the anterior region, NPE cells stained intensely at the basal lateral membrane with specific monoclonal and polyclonal antibodies for each of the alpha (alpha 1, alpha 2, alpha 3) and beta (beta 1, beta 2) Na,K-ATPase isoforms. In the middle and posterior regions of the CE, NPE cells showed lower or absent levels of staining with alpha 1, alpha 2, alpha 3, and beta 1 antibodies, although staining with beta 2 was abundant. In contrast, PE cells throughout the CE were stained at the basal lateral membrane by antibodies to alpha 1 and beta 1, while no staining signals were detected with the rest of the antibodies (i.e. alpha 2, alpha 3, and beta 2). Our results support the conclusion that the three alpha and two beta isoforms of the Na+,K(+)-ATPase are differentially expressed in the two cell layers that make up the CE.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W1972642171 date "1991-11-01" @default.
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- W1972642171 title "Expression of multiple Na<sup>+</sup>,K<sup>+</sup>-ATPase genes reveals a gradient of isoforms along the nonpigmented ciliary epithelium: Functional implications in aqueous humor secretion" @default.
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- W1972642171 doi "https://doi.org/10.1002/jcp.1041490203" @default.
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