Behavior of Schistosoma mansoni-induced histopathological lesions in Biomphalaria glabrata submitted to ionizing radiation

Abstract

Present report demonstrates that repeated radiation ofA previous study from this Laboratory had noted that a strain of Biomphalaria glabrata, highly susceptible to Schistosoma mansoni, were seen to shed less and less cercariae along the time of infection 3 . It was also observed that such changing pattern of cercarial shedding presented a good histological correlation. An initial picture of nonreaction (tolerance) gradually turned into one of hemocyte proliferation, with formation of focal encapsulating lesions around disintegrating sporocysts and cercariae. These findings suggested the existence of a primitive form of acquired immunity in invertebrates. In order to explore further along these lines, a plan to eradicate a previous schistosomal snail infection with irradiation was initiated. ARTIGO/ARTICLE

Infestation of Lymnaea stagnalis by digenean flukes in the Jeziorak Lake

“…They can contribute to increased mortality of hosts, especially in highly variable environmental conditions (Theron and Pointier 1995;Gerard 2001b;Morley et al 2003;Azevedo et al 2004). Anti-parasite resistance of hosts in a highly infested population increases the probability of their success in the intra-specific competition for environmental resources (Huxham et al 1995;Curtis 1997).…”

Estudo da resposta do caramujo Biomphalaria glabrata (Say, 1818) frente a estímulos ambientais estressores, com enfoque na proteína HSP70

“…Formada também por um plasma rico em água, cloreto de sódio e bicarbonato (por isso, tem reação alcalina) (Ruppert et al, 2005;Paraense, 2008;Rey, 2011;Neves, 2011). Nos moluscos gastrópodes os hemócitos (células de defesa), associados com fatores humorais da hemolinfa, representam os elementos fundamentais de defesa do molusco contra patógenos, especialmente o S. mansoni (Vasquez & Sullivan, 2001;Azevedo et al, 2004).…”