title: Renal expression of intercellular adhesion molecule-1 in immunoglobulin A nephropathy: tubulointerstitial injury and prognosis.
abstract: In immunoglobulin A nephropathy (IgAN), the abnormal expression of intercellular adhesion molecule-1 (ICAM-1) on proximal tubule epithelium is associated with the glomerular and interstitial infiltration of leucocytes, but its clinical significance remains uncertain. We analysed the relationship between the ICAM-1 (CD54) expression in tubular epithelial cells and interstitial leucocytes, macrophages (CD14) and T lymphocytes (CD3) with the histologic features, proteinuria and serum creatinine at the time of renal biopsy and after 2.42 years in 45 patients with IgAN and after 1.8+/-1.5 years in 29 patients with non-glomerulonephritis (non-GN). In IgAN, ICAM-1+ tubule epithelium was 0.1+/-0.18 (x+/-SD), and this was associated with extracapillary proliferation (up to 20% of Bowman's space), glomerular sclerosis involving less than 50% of glomerular area, interstitial cellular infiltration, tubular atrophy and proteinuria level. ICAM-1+ interstitial leucocytes were correlated with glomerular sclerosis involving less than 50% of glomerular area, glomerular sclerosis involving more than 50% of glomerular area, tubular atrophy, interstitial fibrosis and serum creatinine level. In patients with an increase of 50% in serum creatinine, ICAM-1+, CD14+ and CD3+, interstitial leucocytes were significantly outnumbered than in patients with stable serum creatinine. In non-GN, ICAM-1+ tubule epithelium was 0.02+/-0.04 (U=344, P<0.05, vs IgAN), and this was inversely correlated with the percentage of the normal glomeruli and associated with glomerular sclerosis covering more than 50% of glomerular area, tubular atrophy and serum creatinine level. The association between tubular ICAM-1 and proteinuria and the association between interstitial ICAM-1+, CD14+ and CD3+, leucocytes and renal failure at presentation and the deterioration in IgAN in contrast with non-GN suggest that tubular and interstitial expression of ICAM-1 may be a marker of tubulointerstitial disturbance in IgAN.
authors.affiliation: Services of Nephrology, Hospital Clínic, Barcelona, Spain. parrizabala@senefro.org
authors.forename: P
authors.initials: P
authors.lastname: Arrizabalaga
authors.forename: M
authors.initials: M
authors.lastname: Solé
authors.forename: R
authors.initials: R
authors.lastname: Abellana
authors.forename: C
authors.initials: C
authors.lastname: Ascaso
authors.forename: A
authors.initials: A
authors.lastname: Cardesa
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000032:analysis; D005260:Female; D005920:Glomerular Mesangium / Q000378:metabolism / Q000473:pathology; D005922:Glomerulonephritis, IGA / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D007124:Immunoenzyme Techniques; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism*; D007668:Kidney / Q000033:anatomy & histology / Q000378:metabolism; D007684:Kidney Tubules / Q000378:metabolism* / Q000473:pathology; D007962:Leukocytes / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009395:Nephritis, Interstitial / Q000378:metabolism* / Q000473:pathology; D011379:Prognosis
chemical_list: D015415:Biomarkers; D018799:Intercellular Adhesion Molecule-1