title: Cellular and subcellular immunolocalization of ClC-5 channel in mouse kidney: colocalization with H+-ATPase.
abstract: To determine the immunolocalization of ClC-5 in the mouse kidney, we developed a ClC-5-specific rat monoclonal antibody. Immunoblotting demonstrated an 85-kDa band of ClC-5 in the kidney and ClC-5 transfected cells. Immunocytochemistry revealed significant labeling of ClC-5 in brush-border membrane and subapical intracellular vesicles of the proximal tubule. In addition, apical and cytoplasmic staining was observed in the type A intercalated cells in the cortical collecting duct. In contrast, the staining was minimal in the outer and inner medullary collecting ducts and the thick ascending limb. Western blotting of vesicles immunoisolated by the ClC-5 antibody showed the presence of H+-ATPase, strongly indicating that these two proteins were present in the same membranes. Double labeling with antibodies against ClC-5 and H+-ATPase and analysis by confocal images showed that ClC-5 and H+-ATPase colocalized in these ClC-5-positive cells. These findings suggest that ClC-5 might be involved in the endocytosis and/or the H+ secretion in the proximal tubule cells and the cortical collecting duct type A intercalated cells in mouse kidney.
authors.affiliation: Second Department of Internal Medicine, Tokyo Medical and Dental University, Tokyo 113-8519, Japan. hsakamoto.med2@med.tmd.ac.jp
authors.forename: H
authors.initials: H
authors.lastname: Sakamoto
authors.forename: Y
authors.initials: Y
authors.lastname: Sado
authors.forename: I
authors.initials: I
authors.lastname: Naito
authors.forename: T H
authors.initials: TH
authors.lastname: Kwon
authors.forename: S
authors.initials: S
authors.lastname: Inoue
authors.forename: K
authors.initials: K
authors.lastname: Endo
authors.forename: M
authors.initials: M
authors.lastname: Kawasaki
authors.forename: S
authors.initials: S
authors.lastname: Uchida
authors.forename: S
authors.initials: S
authors.lastname: Nielsen
authors.forename: S
authors.initials: S
authors.lastname: Sasaki
authors.forename: F
authors.initials: F
authors.lastname: Marumo
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal; D051399:Aquaporin 2; D051403:Aquaporin 6; D020346:Aquaporins / Q000032:analysis; D016466:CHO Cells; D018118:Chloride Channels / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D006224:Cricetinae; D007150:Immunohistochemistry; D007668:Kidney / Q000166:cytology / Q000378:metabolism* / Q000648:ultrastructure; D007685:Kidney Tubules, Collecting / Q000166:cytology / Q000378:metabolism; D007687:Kidney Tubules, Proximal / Q000166:cytology / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000737:chemistry / Q000276:immunology; D006180:Proton-Translocating ATPases / Q000032:analysis / Q000378:metabolism*; D051381:Rats; D011994:Recombinant Proteins / Q000032:analysis / Q000096:biosynthesis; D013347:Subcellular Fractions / Q000378:metabolism / Q000648:ultrastructure; D014162:Transfection
chemical_list: D000911:Antibodies, Monoclonal; C496024:Aqp2 protein, mouse; C496025:Aqp2 protein, rat; D051399:Aquaporin 2; D051403:Aquaporin 6; D020346:Aquaporins; C097503:CLC-5 chloride channel; D018118:Chloride Channels; D010446:Peptide Fragments; D011994:Recombinant Proteins; D006180:Proton-Translocating ATPases