Cardiotoxic Effects of Micrurus surinamensis (Cuvier, 1817) Snake Venom

Micrurus surinamensis is a coral snake from the Elapidae family of wide distribution in Amazonia Forest. Its venom contains neurotoxins that induce muscular and respiratory paralysis; however, its cardiovascular action is not yet characterized. The aim of this study was to investigate the cardiotoxi...

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Veröffentlicht in:Cardiovascular toxicology 2021-06, Vol.21 (6), p.462-471
Hauptverfasser: Reis, Lilian de Paula Gonçalves, Botelho, Ana Flávia Machado, Novais, Clara Rojo, Fiúza, Aparecida Tatiane Lino, Barreto, Maira Souza Oliveira, Ferreira, Marina Guimarães, Bonilla, Cesar, Chavez-Olórtegui, Carlos, Melo, Marília Martins
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container_issue 6
container_start_page 462
container_title Cardiovascular toxicology
container_volume 21
creator Reis, Lilian de Paula Gonçalves
Botelho, Ana Flávia Machado
Novais, Clara Rojo
Fiúza, Aparecida Tatiane Lino
Barreto, Maira Souza Oliveira
Ferreira, Marina Guimarães
Bonilla, Cesar
Chavez-Olórtegui, Carlos
Melo, Marília Martins
description Micrurus surinamensis is a coral snake from the Elapidae family of wide distribution in Amazonia Forest. Its venom contains neurotoxins that induce muscular and respiratory paralysis; however, its cardiovascular action is not yet characterized. The aim of this study was to investigate the cardiotoxic effects caused by M. surinamensis poisoning in rodents. Twelve guinea pigs ( Cavia porcellus ) were distributed in two groups ( n  = 6) named as control and envenomed. The control group received 0.2 ml of PBS/BSA via intramuscular injection (IM), while envenomed animals received 0.75 µg of venom per g of body weight, also via IM. Electrocardiographic examination (ECG) and biochemical serum tests were conducted before and 2 h after inoculation. ECG of the envenomed animals revealed severe progressive arrhythmias including atrioventricular block, supraventricular, and ventricular extrasystoles. Serum biochemistry showed significant increase in CK, CK-MB, and LDH enzymes corroborating the skeletal and cardiac muscle damage. Myonecrosis and degeneration were observed in both skeletal and heart muscle; nevertheless, transmission electron microscopy revealed cardiac muscle fibers fragmentation. In conclusion, M. surinamensis venom has a potent cardiotoxic activity eliciting arrhythmogenic effects and heart damage after only 2 h of envenomation.
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Its venom contains neurotoxins that induce muscular and respiratory paralysis; however, its cardiovascular action is not yet characterized. The aim of this study was to investigate the cardiotoxic effects caused by M. surinamensis poisoning in rodents. Twelve guinea pigs ( Cavia porcellus ) were distributed in two groups ( n  = 6) named as control and envenomed. The control group received 0.2 ml of PBS/BSA via intramuscular injection (IM), while envenomed animals received 0.75 µg of venom per g of body weight, also via IM. Electrocardiographic examination (ECG) and biochemical serum tests were conducted before and 2 h after inoculation. ECG of the envenomed animals revealed severe progressive arrhythmias including atrioventricular block, supraventricular, and ventricular extrasystoles. Serum biochemistry showed significant increase in CK, CK-MB, and LDH enzymes corroborating the skeletal and cardiac muscle damage. 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subjects Animals
Arrhythmia
Arrhythmias, Cardiac - chemically induced
Arrhythmias, Cardiac - physiopathology
Atrial Premature Complexes - chemically induced
Atrial Premature Complexes - physiopathology
Atrioventricular Block - chemically induced
Atrioventricular Block - physiopathology
Biomedical and Life Sciences
Biomedicine
Body weight
Cardiac muscle
Cardiology
Cardiotoxicity
Cardiotoxins
Coral Snakes
Creatine kinase
Damage
Degeneration
EKG
Elapid Venoms - toxicity
Electrocardiogram
Electrocardiography
Enzymes
Ethylenediaminetetraacetic acid
Guinea Pigs
Heart Rate - drug effects
Inoculation
Male
Micrurus surinamensis
Muscle, Skeletal - drug effects
Muscle, Skeletal - pathology
Muscles
Myocytes, Cardiac - drug effects
Myocytes, Cardiac - metabolism
Myocytes, Cardiac - ultrastructure
Myonecrosis
Necrosis
Neurotoxins
Paralysis
Pharmacology/Toxicology
Poisoning
Poisonous snakes
Skeletal muscle
Snakes
Time Factors
Toxins
Transmission electron microscopy
Venom
Ventricle
Ventricular Premature Complexes - chemically induced
Ventricular Premature Complexes - physiopathology
title Cardiotoxic Effects of Micrurus surinamensis (Cuvier, 1817) Snake Venom
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