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Presence of two isoforms of Na, K-ATPase with different pharmacological and immunological properties in the rat kidney by E. Fraille; C. Barlet-Bas; L. Cheval; M. Rousselot; M. L. Carranza; D. Dreher; E. Arystarkhova; A. Doucet; H. Favre is a Medicine article available to read on EtoBox.
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Previous studies have demonstrated the presence of two populations of Na,K-ATPase with distinct kinetic, pharmacological and immunological characteristics along the rabbit nephron, indicating that the proximal segments of the nephron express exclusively the ~ isoform of the catalytic subunit, whereas the collecting duct expresses an e~-like isoform. Because pharmacological studies have shown the existence of two populations of Na,K-ATPase with different sensitivities to ouabain in the rat cortical collecting duct, which may result from the presence in the same nephron segment of the two isoforms demonstrated in the different segments of the rabbit nephron, the present study was undertaken to characterize the properties of Na,K-ATPase along the rat nephron. Results indicate that each segment of the rat nephron contains two subpopulations of Na,K-ATPase: a component highly sensitive to ouabain (ICs0 ~ 5.10 -6 M) which is recognized by an anti-~3 antibody and another moiety of lower affinity for ouabain (ICs0 ~5.10 4 M) which is recognized by an anti-~l antibody. Whether these two subpopulations correspond to different isoforms of the subunit of Na,K-ATPase (e~ and e3-1ike) remains to
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- Author
- E. Fraille; C. Barlet-Bas; L. Cheval; M. Rousselot; M. L. Carranza; D. Dreher; E. Arystarkhova; A. Doucet; H. Favre
- Publisher
- Springer; Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC (ISSN 0031-6768)
- Published
- 1995
- Language
- EN
- Field
- Medicine (Life Sciences)