[논문]Immunoelectron Microscopic Localization of the Electrogenic Na/HCO3 Cotransporter in Rat and Ambystoma Kidney

MAUNSBACH, ARVID B.; VORUM, HENRIK; KWON, TAE-HWAN; NIELSEN, SØREN; SIMONSEN, BRIAN; CHOI, INYEONG; SCHMITT, BERNHARD M.; BORON, WALTER F.; AALKJæR, CHRISTIAN

doi:10.1681/asn.v11122179

[해외논문] Immunoelectron Microscopic Localization of the Electrogenic Na/HCO3 Cotransporter in Rat and Ambystoma Kidney 원문보기

Journal of the American Society of Nephrology : JASN, v.11 no.12, 2000년, pp.2179 - 2189

MAUNSBACH, ARVID B. , VORUM, HENRIK , KWON, TAE-HWAN , NIELSEN, SØREN , SIMONSEN, BRIAN , CHOI, INYEONG , SCHMITT, BERNHARD M. , BORON, WALTER F. , AALKJæR, CHRISTIAN

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Abstract. Immunofluorescence analysis has revealed that electrogenic Na+/HCO3- (NBC1) is expressed in the proximal tubule of rat kidney and in the proximal and distal tubules of the salamander Ambystoma tigrinum kidney. The present study was undertaken to define the detailed subcellular localization of the NBC1 in rat and Ambystoma kidney using high-resolution immunoelectron microscopy. For this purpose, two rabbit polyclonal antibodies raised against amino acids 928 to 1035 and amino acids 1021 to 1035 of the C-terminus of rat kidney (rkNBC1) were developed. The affinity-purified antibodies revealed a strong band of approximately 140 kD in immunoblots of membranes from rat kidney cortex but no signal in membranes isolated from outer and inner medulla. Deglycosylation reduced the apparent molecular weight to approximately 120 kD, corresponding to the predicted molecular weight. A similar but weaker band was also present in membranes isolated from the lateral part of Ambystoma kidney. In rat kidney, immunohistochemistry confirmed the presence of rkNBC1 in convoluted segments of the proximal tubules. In ultrathin cryosections or Lowicryl HM20 sections from rat kidney cortex, distinct immunogold labeling was associated with the basolateral plasma membrane of segments S1 and S2 of proximal tubules, whereas in S3 no labeling was observed. The labeling density was similar at the basal and lateral plasma membrane and was specifically associated with the inner surface of the membrane consistent with the internal position of the C-terminus of the transporter. In contrast, rkNBC1 was absent from the apical plasma membrane and not observed in intracellular vesicles, including those closely associated with basolateral plasma membrane. In Ambystoma kidney, a weak labeling was present in the basolateral membrane of the proximal tubule and stronger labeling was observed in the late distal segment. The results demonstrate that rkNBC1 is expressed only in segment S1 and segment S2 of rat proximal tubule as well as Ambystoma proximal and late distal tubule and that rkNBC1 is present in both basal and lateral plasma membranes and absent in intracellular vesicles of the apical plasma membrane.

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