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Journal Article
Research Support, Non-U.S. Gov't
Biological and immunochemical characterization of Micrurus altirostris venom and serum neutralization of its toxic activities.
Micrurus altirostris venom from Rio Grande do Sul State, Brazil, was characterized by its biological activities, immunochemical properties and electrophoretic pattern. The results showed a high edematogenic activity, whose peak was observed after 30min of venom injection, as well as a high indirect hemolytic activity. This venom was myotoxic, as shown by a peak of CK release at 6h after injection, and also by the appearance of muscular lesions characterized by necrosis, loss of striated muscle fibers, and the presence of vacuolization, edema and inflammatory infiltrate. This venom showed minimum proteolytic activity and no hemorrhagic, dermonecrotic or coagulant activities. Nonetheless, M. altirostris venom presented high lethal activity. Electrophoretic patterns of Micrurus frontalis and M. altirostris venoms showed different protein bands. Anti-elapidic serum could recognize M. frontalis (homologous) and M. altirostris (heterologous) venoms by Western blotting, and both venoms presented similar titers when assayed by ELISA. The results observed on neutralization tests showed that the anti-elapidic serum produced by Instituto Butantan neutralized myotoxic and hemolytic activities. However, this antivenom could not neutralize the lethal activity of M. altirostris venom. Thus, these data suggest that M. altirostris venom presents different biological, enzymatic and immunological characteristics from other Micrurus venoms, and some activities are not neutralized by the commercial anti-elapidic serum produced in Brazil.
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