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Cloning and immunolocalization of a rat pancreatic Na(+) bicarbonate cotransporter.

Abstract：

:In the rat, pancreatic HCO(-)(3) secretion is believed to be mediated by duct cells with an apical Cl(-)/HCO(-)(3) exchanger acting in parallel with a cAMP-activated Cl(-) channel and protons being extruded through a basolateral Na(+)/H(+) exchanger. However, this may not be the only mechanism for HCO(-)(3) secretion by the rat pancreas. Recently, several members of electrogenic Na(+)/HCO(-)(3) cotransporters (NBC) have been cloned. Here we report the cloning of a NBC from rat pancreas (rpNBC). This rpNBC is 99% identical to the longer, more common form of NBC [pNBC; 1079 amino acids (aa); 122 kDa in human heart, pancreas, prostate, and a minor clone in kidney]. The longer NBC isoforms are identical to the rat and human kidney-specific forms (kNBC; 1035 aa; 116 kDa) at the approximately 980 C-terminal aa's and are unique (with different lengths) at the initial N-terminus. Using polyclonal antibodies to the common N- and C-termini of rat kidney NBC, a approximately 130-kDa protein band was labeled by immunoblotting of rat pancreas homogenate and was enriched in the plasma membrane fraction. Immunofluorescence and immunoperoxidase light microscopy of rat pancreatic tissue with both antibodies revealed basolateral labeling of acinar cells. Labeling of both apical and basolateral membranes was found in centroacinar cells, intra- and extralobular duct, and main duct cells. The specificity of the antibody labeling was confirmed by antibody preabsorption experiments with the fusion protein used for immunization. The data suggest that rpNBC likely plays a more important role in the transport of HCO(-)(3) by rat pancreatic acinar and duct cells than previously believed.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Thévenod F,Roussa E,Schmitt BM,Romero MF

doi

10.1006/bbrc.1999.1484

subject

Has Abstract

pub_date

1999-10-14 00:00:00

pages

291-8

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(99)91484-5

journal_volume

264

pub_type

杂志文章

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