Action of anti-bothropic factor isolated from Didelphis marsupialis on renal effects of Bothrops erythromelas venom

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, ede...

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Published in:	Toxicon (Oxford) 2005-11, Vol.46 (6), p.595-599
Main Authors:	Martins, Alice M.C., Sousa, Fabiola C.M., Barbosa, Paulo S.F., Toyama, Marcos H., Toyama, Daniela O., Aprígio, Cleidiana C., Queiroz, Maria G.R., Guarnieri, Mirian C., Havt, Alexandre, de Menezes, Dalgimar B., Fonteles, Manassés C., Monteiro, Helena S.A.
Format:	Article
Language:	eng
Subjects:	Animal poisons toxicology. Antivenoms Animals Anti-bothropic factor Biological and medical sciences Bothrops Bothrops erytromrlas Brazil Carrier Proteins - isolation & purification Carrier Proteins - pharmacology Crotalid Venoms - antagonists & inhibitors Crotalid Venoms - toxicity Didelphis - blood Didelphis marsupialis Glomerular Filtration Rate - drug effects Kidney - blood supply Kidney - drug effects Kidney - metabolism Medical sciences Perfusion Potassium - metabolism Rats Rats, Wistar Renal effects Sodium - metabolism Toxicology Vascular Resistance - drug effects
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Summary:	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 mL −1) decreased the PP (ct=108.71±5.09 mmHg; BE=65.21±5.6 mmHg) and RVR (ct=5.76±0.65 mmHg mL −1 g −1 min −1; BE=3.10±0.45 mmHg mL −1 g −1 min −1). On the other hand, the GFR decreased at 60 min (ct 60=0.76±0.07 mL g −1 min −1; BE 60=0.42±0.12 mL g −1 min −1) and increased at 120 min (ct 120=0.72±0.01 mL g −1 min −1; BE 120=1.24±0.26 mL g −1 min −1). The UF increased significantly when compared with the control group (ct=0.14±0.01 mL g −1 min −1; BE=0.47±0.08 mL g −1 min −1). The venom reduced the %TNa + (ct 90=79.18±0.88%; BE 90=58.35±4.86%) and %TK + (ct 90=67.20±4.04%; BE 90=57.32±5.26%*) The anti-bothropic factor from D. marsupialis (10 μg mL −1) incubated with B. erythromelas venom (10 μg mL −1) 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 mL −1) 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.
ISSN:	0041-0101 1879-3150