Brown spider dermonecrotic toxin directly induces nephrotoxicity

Brown spider dermonecrotic toxin directly induces nephrotoxicity

Author Chaim, O. M. Google Scholar
Sade, Y. B. Google Scholar
Silveira, R. B. da Google Scholar
Toma, L. Google Scholar
Kalapothakis, E. Google Scholar
Chavez-Olortegui, C. Google Scholar
Mangili, O. C. Google Scholar
Gremski, W. Google Scholar
von Dietrich, C. P. Google Scholar
Nader, H. B. Google Scholar
Veiga, S. S. Google Scholar
Institution Univ Fed Parana
Universidade Federal de São Paulo (UNIFESP)
Universidade Federal de Minas Gerais (UFMG)
Catholic Univ parana
Abstract Brown spider (Loxosceles genus) venom can induce dermonecrotic lesions at the bite site and systemic manifestations including fever, vomiting, convulsions, disseminated intravascular coagulation, hemolytic anemia and acute renal failure. the venom is composed of a mixture of proteins with several molecules biochemically and biologically well characterized. the mechanism by which the venom induces renal damage is unknown. By using mice exposed to Loxosceles intermedia recombinant dermonecrotic toxin (LiRecDT), we showed direct induction of renal injuries. Microscopic analysis of renal biopsies from dermonecrotic toxin-treated mice showed histological alterations including glomerular edema and tubular necrosis. Hyalinization of tubules with deposition of proteinaceous material in the tubule lumen, tubule epithelial cell vacuoles, tubular edema and epithelial cell lysis was also observed. Leukocytic infiltration was neither observed in the glomerulus nor the tubules. Renal vessels showed no sign of inflammatory response. Additionally, biochemical analyses showed such toxin-induced changes in renal function as urine alkalinization, hematuria and azotemia with elevation of blood urea nitrogen levels. Immunofluorescence with dermonecrotic toxin antibodies and confocal microscopy analysis showed deposition and direct binding of this toxin to renal intrinsic structures. By immunoblotting with a hyperimmune dermonecrotic toxin antiserum on renal lysates from toxin-treated mice, we detected a positive signal at the region of 33-35 kDa, which strengthens the idea that renal failure is directly induced by dermonecrotic toxin. Immunofluorescence reaction with dermonecrotic toxin antibodies revealed deposition and binding of this toxin directly in MDCK epithelial cells in culture. similarly, dermonecrotic toxin treatment caused morphological alterations of MDCK cells including cytoplasmic vacuoles, blebs, evoked impaired spreading and detached cells from each other and from culture substratum. in addition, dermonecrotic toxin treatment of MDCK cells changed their viability evaluated by XTT and Neutral-Red Uptake methodologies. the present results point to brown spider dermonecrotic toxin cytotoxicity upon renal structures in vivo and renal cells in vitro and provide experimental evidence that this brown spider toxin is directly involved in nephrotoxicity evoked during Loxosceles spider venom accidents. (c) 2005 Elsevier Inc. All rights reserved.
Keywords brown spider
dermonecrotic toxin
cytotoxicity
kidney
MDCK cells
Language English
Date 2006-02-15
Published in Toxicology and Applied Pharmacology. San Diego: Academic Press Inc Elsevier Science, v. 211, n. 1, p. 64-77, 2006.
ISSN 0041-008X (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 64-77
Origin http://dx.doi.org/10.1016/j.taap.2005.05.015
Access rights Closed access
Type Article
Web of Science ID WOS:000235572300007
URI http://repositorio.unifesp.br/handle/11600/28750

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