title: Immunohistochemical distribution and quantification of crystal matrix protein.
abstract: The aim of this study was to determine the immunohistochemical distribution and quantification of crystal matrix protein (CMP). CMP, a 31 kDa glycoprotein, is the principal macromolecule found in calcium oxalate crystals generated in human urine, and is a potent inhibitor of crystal aggregation. A polyclonal rabbit anti-human CMP antibody was used to examine renal tissue by immunohistochemical techniques and light microscopy (N = 45). Twenty-five other human organs were similarly assessed. Quantification was performed using a visual analogue scale. CMP was visible as cytoplasmic staining in the epithelial cells of the TALH and the distal convoluted tubule including the macula densa in a subgroup of nephrons. CMP was not identified elsewhere in the urinary tract or in the extrarenal organs examined. Despite a trend indicating that the kidneys of normal men had more CMP than those of normal women, the difference failed to reach significance (P = 0.11). There was, however, more CMP in the stone formers group compared with either normal men (P < 0.01) or normal women (P < 0.01). This protein may be an important determinant of calcium oxalate kidney stone disease.
authors.affiliation: Department of Surgery, Flinders Medical Centre, Australia.
authors.forename: A M
authors.initials: AM
authors.lastname: Stapleton
authors.forename: A E
authors.initials: AE
authors.lastname: Seymour
authors.forename: J S
authors.initials: JS
authors.lastname: Brennan
authors.forename: I R
authors.initials: IR
authors.lastname: Doyle
authors.forename: V R
authors.initials: VR
authors.lastname: Marshall
authors.forename: R L
authors.initials: RL
authors.lastname: Ryall
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000818:Animals; D000911:Antibodies, Monoclonal; D005260:Female; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D007668:Kidney / Q000378:metabolism; D008138:Loop of Henle / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D009399:Nephrons / Q000378:metabolism; D011506:Proteins / Q000378:metabolism*; D011817:Rabbits; D013194:Staining and Labeling; D014018:Tissue Distribution
chemical_list: D000911:Antibodies, Monoclonal; D011506:Proteins; C083359:crystal matrix protein, human