Structural and ultrastructural description of the venom gland of Loxosceles intermedia (brown spider)

Structural and ultrastructural description of the venom gland of Loxosceles intermedia (brown spider)

Autor Santos, VLP dos Google Scholar
Franco, CRC Google Scholar
Viggiano, RLL Google Scholar
Silveira, R. B. da Google Scholar
Cantao, M. P. Google Scholar
Mangili, O. C. Google Scholar
Veiga, S. S. Google Scholar
Gremski, W. Google Scholar
Instituição Univ Fed Parana
Universidade Federal de São Paulo (UNIFESP)
Resumo The brown spider, genus Loxosceles, is becoming of great medical importance, with envenomation (Loxoscelism) occurring throughout the world. the biological activities of the brown spider venom usually include dermonecrotic lesions at the bite site accompanied by hemolytic and haemorrhagic effects and also by renal failure. the objective of the present study was to describe the histology of the venom gland of L. intermedia using glands from adult spiders which were investigated by light microscopy, using immunohistochemical and staining methods, by transmission electron microscopy, and by scanning electron microscopy. the organization of the venom gland of Loxosceles intermedia follows the general architecture of spiders' venom glands. Using light microscopy and transmission electron microscopy we observed that the venom glands of L. intermedia present two layers of striated muscle fibers, an external layer and an internal layer in touch with an extracellular matrix which is a basement membrane structure and a fibrillar collagen matrix separating the muscular region from epithelial cells of the venom gland. Muscle cells are multinucleated, with nuclei peripherally placed and their cytoplasm rich in sarcoplasmic reticulum, myofibrills and continuous Z lines. By using scanning electron microscopy we can detect muscular cells from external layer as branching cells. Epithelial cells have their cytosol extremely rich in rough endoplasmic reticulum, mitochondria collection, Golgi apparatus, interdigitating membranes and secretory vesicles that ultimately accumulate the venom, a complex protein mixture. (C) 1999 Elsevier B.V. All rights reserved.
Idioma Inglês
Data de publicação 2000-02-01
Publicado em Toxicon. Oxford: Pergamon-Elsevier B.V., v. 38, n. 2, p. 265-285, 2000.
ISSN 0041-0101 (Sherpa/Romeo, fator de impacto)
Publicador Elsevier B.V.
Extensão 265-285
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000083803000012
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