Renal caveolin-1 expression in children with unilateral ureteropelvic junction obstruction.
Caveolae are plasma membrane invaginations that contain a variety of signal transduction molecules and receptors for growth factors and cytokines. This study was performed to examine the in vivo expression and localization of caveolin-1 in kidneys from 19 children who underwent surgery release of ureteropelvic junction obstruction (UPJO) in relation to renal function and degree of tubulointerstitial fibrosis. Renal biopsies were carried out at the time of surgery for obstruction release. Kidney tissue from children of similar age removed because of carcinoma was used as control. Expression of caveolin-1 at the protein level in renal tissue and urine was demonstrated in patients with technetium 99 m labeled diethylene triamine pentaacetate ((99)Tc DTPA) renal scan 28.8+/-2% and increased tubular interstitial fibrosis in seven patients at the time of obstruction release. Colocalization staining of AT(1) angiotensin II receptor with caveolin-1 in basolateral membrane of epithelial tubule cells, enhanced AT(1) messenger ribonucleic acid (mRNA) and decreased endothelial nitric oxide synthase (eNOS), were shown in these patients. In contrast, absence of association of caveolin-1 with AT(1) receptor expression in proximal and collecting tubule membranes with AT(1) receptor mRNA and eNOS mRNA expression near control were demonstrated in 12 patients, with (99)Tc DTPA renal scan 39.7+2.1% and no evidence of tubulointerstitial fibrosis. From our results, the role of caveolin-1 as a factor contributing to the severity of the tubulointerstitial process resulting from obstructive nephropathy could be suggested.
Vallés
Patricia G
PG
Area de Fisiología Patológica, Departamento de Patología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Centro Universitario, 5500, Mendoza, Argentina.
Manucha
Walter
W
Carrizo
Liliana
L
Vega Perugorria
José
J
Seltzer
Alicia
A
Ruete
Celeste
C
D017209:Apoptosis / Q000502:physiology; D001706:Biopsy; D016022:Case-Control Studies; D051242:Caveolin 1 / Q000235:genetics / Q000378:metabolism*; D002648:Child; D002675:Child, Preschool; D005260:Female; D005919:Glomerular Filtration Rate / Q000502:physiology; D006801:Humans; D007223:Infant; D007672:Kidney Cortex / Q000378:metabolism* / Q000473:pathology; D008297:Male; D052250:Nitric Oxide Synthase Type III / Q000235:genetics / Q000378:metabolism; D010388:Pelvis / Q000601:surgery; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D044140:Receptor, Angiotensin, Type 1 / Q000235:genetics / Q000378:metabolism; D014517:Ureteral Obstruction / Q000151:congenital / Q000378:metabolism* / Q000601:surgery
D051242:Caveolin 1; D012333:RNA, Messenger; D044140:Receptor, Angiotensin, Type 1; D052250:Nitric Oxide Synthase Type III