@article {Cristine Neves Mamede:2013:0929-8665:192,
title = "Histological and Ultrastructural Analyses of Muscle Damage Induced by a Myotoxin Isolated from Bothrops alternatus Snake Venom",
journal = "Protein and Peptide Letters",
parent_itemid = "infobike://ben/ppl",
publishercode ="ben",
year = "2013",
volume = "20",
number = "2",
publication date ="2013-02-01T00:00:00",
pages = "192-199",
itemtype = "ARTICLE",
issn = "0929-8665",
url = "https://www.ingentaconnect.com/content/ben/ppl/2013/00000020/00000002/art00011",
doi = "doi:10.2174/092986613804725352",
keyword = "ultrastructural alterations, histopathology, myotoxin, Bothrops alternatus, myonecrosis, skeletal muscle",
author = "Cristine Neves Mamede, Carla and Ribeiro de Queiroz, Mayara and Cortes Fonseca, Kelly and Cristina Gomes de Morais, Nadia and Antonio Gomes Filho, Saulo and Emilio Beletti, Marcelo and Stanziola, Leonilda and de Oliveira, Fabio",
abstract = "Muscular necrosis is a serious consequence of Bothrops snake bites that may lead to permanent loss of tissue or function. Myonecrosis may be due to injury to blood vessels, destabilization and/or rupture of plasma membrane, and inflammatory mechanisms triggered by different proteins
from the snake venom. In this work we describe the isolation and partial functional characterization of a myotoxin from B. alternatus snake venom. The myotoxin was isolated by a combination of ion exchange and gel filtration chromatography and displayed a molecular weight of approximately
15,000, as estimated by SDS-PAGE under reducing conditions. In non-reducing conditions a protein band of approximately 25,000 was also observed, suggesting that its native form is a homodimer. The myotoxin induced myonecrosis, but had no proteolytic and phospholipase A2 activities. The myotoxic
activity was assessed on the basis of the histological and ultrastructural alterations induced by the toxin in the gastrocnemius skeletal muscle of Swiss mice. The toxin led to a series of drastic degenerative events characterized by extensive cellular destruction, loss of the arrangements
of skeletal fibers, intense infiltration of inflammatory cells, fatty degeneration and hemorrhage. Electron microscopy analyses revealed that the myotoxin caused cell swelling, mitochondrial alterations and dilation of the sarcoplasmic reticulum, but did not affect the integrity of the muscle
cell membranes. The myonecrosis caused by this toxin was related to the perturbation in the membrane permeability, intracellular alterations and inflammatory reaction.",
}