Elsevier

Toxicon

Volume 49, Issue 1, January 2007, Pages 82-88
Toxicon

Effects of Russell's viper venom fractions on systemic and renal hemodynamics

https://doi.org/10.1016/j.toxicon.2006.09.013Get rights and content

Abstract

Changes in systemic and renal hemodynamics induced by Russell's viper venom are well established. The component of the venom responsible for hemodynamic alteration has not been identified. By Sephadex column chromatography five fractions of Russell's viper (Daboia russellii siamensis) venom were isolated. Each venom fraction consisted of phospholipase A2, proteolytic enzyme, phosphomonoesterase, phosphodiesterase, arginine ester hydrolase and hyaluronidase of varying activities. Hemodynamic effects of each venom fraction including mean arterial pressure, cardiac output, systemic and renal vascular resistance, renal blood flow and glomerular filtration rate were studied in five groups of dogs; each group had four dogs. Minimal hemodynamic changes were observed in dogs receiving venom fraction I. Increased renal vascular resistance with diminution of renal blood flow and glomerular filtration rate was observed in dogs receiving venom fractions II, III, IV and V. A markedly increased renal vascular resistance with maximal decrease in renal blood flow and glomerular filtration rate was caused by fraction III of the venom with highest PLA2 and proteolytic enzyme activities. However, renal hemodynamic changes appeared to correlate better with proteolytic enzyme activity than PLA2 activity. The findings suggested the proteolytic enzyme as an important determinant of hemodynamic alteration. Fractional excretion of Na was increased in dogs injected with venom fraction IV, and is presumed to be due to the inhibition of tubular reabsorption of Na by a natriuretic factor in this venom fraction.

Introduction

Acute renal failure is a common complication of Russell's viper envenomation (Sitprija and Boonpucknavig, 1979; Chugh, 1989). Hemodynamic alterations are among factors incriminated in the pathogenesis of renal failure (Sitprija and Chaiyabutr, 1999). A previous hemodynamic study in dogs following crude Russell's viper venom injection has shown initial hypotension and increased systemic and renal vascular resistance later followed by decreased systemic vascular resistance, increased renal vascular resistance, decreased renal blood flow and glomerular filtration rate (Tungthanathanich et al., 1986; Thamaree et al., 1994). In an isolated renal perfusion study crude Russell's viper venom decreased the glomerular filtration rate in a dose dependent fashion (Ratcliffe et al., 1989). Decreased RBF and GRF due to increased RVR have also been demonstrated in isolated renal perfusion using the venom of Crotalus durissus cascavilla (Martin et al., 1998). Several vasoactive mediators and cytokines from the host have been shown to be involved in hemodynamic changes. Phospholipase A2 (PLA2) was believed to be responsible for hypotension through the effect of prostaglandins (Huang and Lee, 1984). Since Russell's viper venom is very complex with several venom components, PLA2 may not be the only factor that triggers hemodynamic changes. In this report Russell's viper venom was fractionated. The enzymatic activities exhibited by each venom fraction was determined, and the effects of each venom fraction on hemodynamics were studied. The study was descriptive, but served as a basis for further work.

Section snippets

Experimental design

The experiments were performed on 20 healthy anesthetized mongrel male dogs, weighing 10–20 kg and fed on a standard laboratory diet. They were kept in individual cages and given a standard diet and water. Food was withheld 8 h before the experiment. Studies were performed with the approval of and in accordance with recommendations given by the ethics committee of the Thai Red Cross Society.

The dogs were divided into five groups, each group of four dogs. Anesthesia was induced with sodium

Venom fractions

Daboia russellii siamensis venom was separated into five fractions (Fig. 1). Percent protein recovery and enzymatic activities of each venom fraction are displayed in Table 1. Venom fraction III possessed the highest activities of PLA2, arginine ester hydrolase and proteolytic activity. Venom fraction II had highest phosphomonoesterase, phosphodiesterase and hyaluronidase and second highest proteolytic activities.

Hemodynamics

In each group of dogs maximal changes in hemodynamic parameters including MAP, CO,

Discussion

By Sephadex column chromatography five fractions of Russell's viper venom were isolated. This is a short term study of 2 h of these venom fractions on hemodynamics in dogs. Venom fraction I caused minimal changes in hemodynamic parameters. Striking hemodynamic alterations were produced by venom fractions II, III, IV and V. Profound renal hemodynamic changes were induced by venom fraction III with marked elevation of RVR and a markedly decreased renal blood flow and GFR. These changes were

Acknowledgments

This study was supported by a grant from the Chongkolneenithi Foundation. Miss. Yuppayao Chiemrungsun typed the manuscript.

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