ORCID Profile
0000-0002-6647-452X
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Publisher: Elsevier BV
Date: 07-2002
DOI: 10.1046/J.1523-1755.2002.00401.X
Abstract: Tubulointerstitial lesions, characterized by tubular injury, interstitial fibrosis and the appearance of myofibroblasts, are the strongest predictors of the degree and progression of chronic renal failure. These lesions are typically preceded by macrophage infiltration of the tubulointerstitium, raising the possibility that these inflammatory cells promote progressive renal disease through fibrogenic actions on resident tubulointerstitial cells. The aim of the present study, therefore, was to investigate the potentially fibrogenic mechanisms of interleukin-1beta (IL-1beta), a macrophage-derived pro-inflammatory cytokine, on human proximal tubule cells (PTC). Confluent, quiescent, passage 2 PTC were established in primary culture from histologically normal segments of human renal cortex (N = 11) and then incubated in serum- and hormone-free media supplemented with either IL-1beta (0 to 4 ng/mL) or vehicle (control). IL-1beta significantly enhanced fibronectin secretion by up to fourfold in a time- and concentration-dependent fashion. This was accompanied by significant (2.5- to 6-fold) increases in alpha-smooth muscle actin (alpha-SMA) expression, transforming growth factor beta (TGF-beta1) secretion, nitric oxide (NO) production, NO synthase 2 (NOS2) mRNA and lactate dehydrogenase (LDH) release. Cell proliferation was dose-dependently suppressed by IL-1beta. NG-methyl-l-arginine (L-NMMA 1 mmol/L), a specific inhibitor of NOS, blocked NO production but did not alter basal or IL-1beta-stimulated fibronectin secretion. In contrast, a pan-specific TGF-beta neutralizing antibody significantly blocked the effects of IL-1beta on PTC fibronectin secretion (IL-1beta, 268.1 +/- 30.6 vs. IL-1beta+alphaTGF-beta 157.9 +/- 14.4%, of control values, P < 0.001) and DNA synthesis (IL-1beta 81.0 +/- 6.7% vs. IL-1beta+alphaTGF-beta 93.4 +/- 2.1%, of control values, P < 0.01). IL-1beta acts on human PTC to suppress cell proliferation, enhance fibronectin production and promote alpha-smooth muscle actin expression. These actions appear to be mediated by a TGF-beta1 dependent mechanism and are independent of nitric oxide release.
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 24-04-2023
DOI: 10.1097/PEP.0000000000001019
Abstract: To describe the patterns, preferences, and predictors of participation in leisure activities of children and young people with physical disabilities from Brazil. This is a cross-sectional study that included 50 children/young people with physical disabilities from the southeast of Brazil. The children were assessed using the Children's Assessment of Participation and Enjoyment and Preferences for Activities. Children/young people participated in an average of 38% of the activities, with a greater number and frequency of informal, recreational, social, and self-improvement activities. The average frequency of participation in the activities was twice in the previous 4 months. The enjoyment in the participated activities was high. There was a greater preference for recreational, social, and physical activities. Age and functional classification were predictors of participation. This study of children with disabilities from the southeast of Brazil supports studies in other low- and middle-income countries, demonstrating low ersity and intensity of participation in leisure activities, but with high levels of enjoyment.
No related grants have been discovered for Fabio Vila-Nova.