title: Participation of N-acetyl-D-glucosamine carbohydrate moieties in the recognition of Schistosoma mansoni sporocysts by haemocytes of Biomphalaria tenagophila.
abstract: Lectin-carbohydrate binding may be involved in the recognition of Schistosoma mansoni sporocysts by haemocytes of Biomphalaria; therefore, we tested if this interaction is associated with snail resistance against Schistosoma infection. In vitro data showed that most of the S. mansoni sporocysts cultured with haemocytes from Biomphalaria glabrata BH, a highly susceptible snail strain, had a low number of cells that adhered to their tegument and a low mortality rate. Moreover, the addition of N-acetyl-D-glucosamine (GlcNAc) did not alter this pattern of adherence and mortality. Using haemocytes and haemolymph of Biomphalaria tenagophila Cabo Frio, we observed a high percentage of sporocysts with adherent cells, but complete encapsulation was not detected. Low concentrations of GlcNAc increased haemocyte binding to the sporocysts and mortality, which returned to basal levels with high concentrations of the carbohydrate. In contrast, haemocytes plus haemolymph from B. tenagophila Taim encapsulated cellular adhesion index of level 3 and destroyed over 30% of the S. mansoni sporocysts in culture. Interestingly, the addition of GlcNAc, but not mannose, to the culture medium resulted in the significant inhibition of cellular adhesion to the parasite tegument and the reduction of parasite mortality, suggesting that GlcNAc carbohydrate moieties are important to the recognition of S. mansoni by B. tenagophila Taim.
authors: Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil.
authors: Raquel Lopes
authors: RL
authors: Martins-Souza
authors: Cintia Aparecida Jesus
authors: CA
authors: Pereira
authors: Leonardo
authors: L
authors: Rodrigues
authors: Emília Souza
authors: ES
authors: Araújo
authors: Paulo Marcos Zech
authors: PM
authors: Coelho
authors: Ary
authors: A
authors: Corrêa
authors: Deborah
authors: D
authors: Negrão-Corrêa
mesh_terms: D000117:Acetylglucosamine / Q000276:immunology*; D000818:Animals; D001700:Biomphalaria / Q000166:cytology / Q000469:parasitology*; D002241:Carbohydrates / Q000276:immunology; D006434:Hemocytes / Q000469:parasitology*; D006458:Hemolymph / Q000469:parasitology*; D006790:Host-Parasite Interactions; D033661:Oocysts / Q000502:physiology*; D012550:Schistosoma mansoni / Q000276:immunology*
chemical_list: D002241:Carbohydrates; D000117:Acetylglucosamine