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Renal caveolin-1 expression in children with unilateral ureteropelvic junction obstruction

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Abstract

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 (99Tc DTPA) renal scan 28.8±2% and increased tubular interstitial fibrosis in seven patients at the time of obstruction release. Colocalization staining of AT1 angiotensin II receptor with caveolin-1 in basolateral membrane of epithelial tubule cells, enhanced AT1 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 AT1 receptor expression in proximal and collecting tubule membranes with AT1 receptor mRNA and eNOS mRNA expression near control were demonstrated in 12 patients, with 99Tc 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.

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Acknowledgments

This work was performed with financial support from CONICET, PICT/2002 N 05-12620, and the Research and Technology Council of Cuyo University (CIUNC) Mendoza, Argentina / N: 1143 / 04 to P. G. Vallés. Part of this work was presented as an abstract at the 3rd Argentine Pediatric Nephrology Congress, Argentina, 23–25 May, 2006.

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Authors and Affiliations

  1. Área de Fisiología Patológica, Departamento de Patología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Centro Universitario, 5500, Mendoza, Argentina

    Patricia G. Vallés & Liliana Carrizo

  2. IMBECU-CONICET National Council of Scientific and Technical Research of Argentina, Mendoza, Argentina

    Patricia G. Vallés, Walter Manucha & Celeste Ruete

  3. Servicio de Urología, Hospital Notti, Mendoza, Argentina

    José Vega Perugorria

  4. IHEM-CONICET National Council of Scientific and Technical Research of Argentina, Mendoza, Argentina

    Alicia Seltzer

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  1. Patricia G. Vallés
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Correspondence to Patricia G. Vallés.

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Vallés, P.G., Manucha, W., Carrizo, L. et al. Renal caveolin-1 expression in children with unilateral ureteropelvic junction obstruction. Pediatr Nephrol 22, 237–248 (2007). https://doi.org/10.1007/s00467-006-0290-4

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  • DOI: https://doi.org/10.1007/s00467-006-0290-4

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