These data suggest that LEF did not induce vascular effect ISRIB concentration as observed by exposure to the lectins from Canavalia brasiliensis (ConBr), Canavalia ensiformis (ConA), Dioclea guianensis (DguiL) and Vatairea macrocarpa ( Teixeira et al., 2001, Havt et al., 2003 and Martins et al., 2005). As LEF has different carbohydrate specificity compared to ConBr, ConA, DguiL and Vatairea macrocarpa lectin, it might not have interacted with the target site that triggers changes on perfusion pressure and renal vascular resistance. The increase in glomerular filtration rate (Fig. 4) and decrease in the percentage

of Na+/K+/Cl− tubular transport (Fig. 5), both induced by LEF-perfusion, produced a tubuloglomerular feedback alteration which is a complex process that regulates the glomerular filtration rate. Interference in Na+/K+/Cl− transport and increase in glomerular filtration rate was also observed in ConBr-perfused rat kidney (Teixeira et al., 2001). However, ConA affected only K+ reabsorption (Havt et al., 2003) and V. macrocarpa lectin had no interference with electrolyte transport, but increased the glomerular filtration rate and the urinary flow ( Martins et al., 2005). Nevertheless, these above lectin-associated effects suggest the possible involvement of carbohydrate specific target receptors on the animal cell

recognized selleck chemical by lectins. In conclusion, the toxic effects observed in the various models used in this study when cAMP exposed to LEF strongly suggest that one of the toxic principles of I. asarifolia is a sialic acid binding lectin present in its leaves. The authors declare that there are no conflicts of interest. We thank EMBRAPA (Empresa Brasileira de Pesquisa Agropecuária) for partially support this research and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) for doctoral

scholarship (Grant no. 081408/2003-05) to H.O. Salles. We also thank to Centro Nordestino de Aplicação e uso da Ressonância Magnética Nuclear (CENAUREMN) of Federal University of Ceará for NMR analyze, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Programa Nacional de Cooperação Acadêmica (PROCAD) and Fundação de Amparo à Pesquisa do Estado do Ceará (FUNCAP). “
“Thalassophryne nattereri (niquim) is a venomous fish of the Batrachoididae family and, in Brazil, it is known by the severity of the accidents provoked in fishermen and bathers ( Fonseca and Lopes-Ferreira, 2000 and Faco et al., 2003). Its venomous apparatus is composed of two dorsal and two lateral canaliculated spines covered by a membrane connected to venomous glands at the base of the fins. The venom displays proteolytic and myotoxic activities, but it is devoid of phospholipase A2 activity ( Lopes-Ferreira et al., 1998).