Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10880186 | Toxicon | 2005 | 5 Pages |
Abstract
Acute renal failure is the most common complication in the lethal cases caused by snakebites in Brazil. Among the Brazilian venom snakes, Bothrops erythromelas is responsible for the majority of accidents in Northeastern Brazil. Didelphis marsupialis serum could inhibit myonecrotic, hemorrhagic, edematogenic hyperalgesic and lethal effects of envenomation determined by ophidian bites. In the present study, we evaluated the action of the anti-bothropic factor isolated from D. marsupialis on the renal effects promoted by B. erythromelas venom without systemic interference. Isolated kidneys from Wistar rats were perfused with Krebs-Henseleit solution containing 6% bovine serum albumin. We analyzed renal perfusion pressure (PP), renal vascular resistance (RVR), glomerular filtration rate (GFR), urinary flow (UF), and the percentages of sodium and potassium tubular transport (%TNa+, %TK+). The B. erythromelas venom (10 μg mLâ1) decreased the PP (ct=108.71±5.09 mmHg; BE=65.21±5.6 mmHg*) and RVR (ct=5.76±0.65 mmHg mLâ1 gâ1 minâ1; BE=3.10±0.45 mmHg mLâ1 gâ1 minâ1*). On the other hand, the GFR decreased at 60 min (ct60=0.76±0.07 mL gâ1 minâ1; BE60=0.42±0.12 mL gâ1 minâ1*) and increased at 120 min (ct120=0.72±0.01 mL gâ1 minâ1; BE120=1.24±0.26 mL gâ1 minâ1*). The UF increased significantly when compared with the control group (ct=0.14±0.01 mL gâ1 minâ1; BE=0.47±0.08 mL gâ1 minâ1*). The venom reduced the %TNa+ (ct90=79.18±0.88%; BE90=58.35±4.86%*) and %TK+ (ct90=67.20±4.04%; BE90=57.32±5.26%*) The anti-bothropic factor from D. marsupialis (10 μg mLâ1) incubated with B. erythromelas venom (10 μg mLâ1) blocked the effects on PP, RVR, %TNa+, and %TK+, but was not able to reverse the effects in UF and GFR promoted by venom alone. However, the highest concentration of D. marsupialis serum (30 μg mLâ1) reversed all the renal effects induced by the venom. In conclusion, B. erythromelas venom altered all the renal functional parameters evaluated and the anti-bothropic factor from D. marsupialis was able to inhibit the effects induced by the venom in isolated kidney.
Keywords
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Authors
Alice M.C. Martins, Fabiola C.M. Sousa, Paulo S.F. Barbosa, Marcos H. Toyama, Daniela O. Toyama, Cleidiana C. AprÃgio, Maria G.R. Queiroz, Mirian C. Guarnieri, Alexandre Havt, Dalgimar B. de Menezes, Manassés C. Fonteles, Helena S.A. Monteiro,