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Type: Artigo
Title: Histological and functional renal alterations caused by Bothrops alternatus snake venom : expression and activity of Na+/K+-ATPase
Author: Linardi, Alessandra
Silva, Thomaz A.A. Rocha e
Miyabara, Elen H.
Franco-Penteado, Carla F.
Cardoso, Kiara C.
Boer, Patrícia A.
Moriscot, Anselmo S.
Gontijo, José A.R.
Joazeiro, Paulo P.
Collares-Buzato, Carla B.
Hyslop, Stephen
Abstract: Acute renal failure is a serious complication of human envenoming by Bothrops snakes. The ion pump Na+/K+-ATPase has an important role in renal tubule function, where it modulates sodium reabsorption and homeostasis of the extracellular compartment. Here, we investigated the morphological and functional renal alterations and changes in Na+/K+-ATPase expression and activity in rats injected with Bothrops alternatus snake venom. Male Wistar rats were injected with venom (0.8 mg/kg, i.v.) and renal function was assessed 6, 24, 48 and 72 h and 7 days post-venom. The rats were then killed and renal Na+/K+-ATPase activity was assayed based on phosphate release from ATP; gene and protein expressions were assessed by real time PCR and immunofluorescence microscopy, respectively. Venom caused lobulation of the capillary tufts, dilation of Bowman's capsular space, F-actin disruption in Bowman's capsule and renal tubule brush border, and deposition of collagen around glomeruli and proximal tubules that persisted seven days after envenoming. Enhanced sodium and potassium excretion, reduced proximal sodium reabsorption, and proteinuria were observed 6 h post-venom, followed by a transient decrease in the glomerular filtration rate. Gene and protein expressions of the Na+/K+-ATPase α1 subunit were increased 6 h post-venom, whereas Na+/K+-ATPase activity increased 6 h and 24 h post-venom. Bothrops alternatus venom caused marked morphological and functional renal alterations with enhanced Na+/K+-ATPase expression and activity in the early phase of renal damage
Subject: Rins
Country: Países Baixos
Editor: Elsevier
Rights: Fechado
Identifier DOI: 10.1016/j.bbagen.2011.06.006
Date Issue: 2011
Appears in Collections:FCM - Artigos e Outros Documentos
HEMO - Artigos e Outros Documentos

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