QUANTIFICATION OF THE POPULATION AND PHAGOCYTARY ACTIVITY OF HEMOCYTES OF RESISTANT AND SUSCEPTIBLE STRAINS OF Biomphalaria glabrata AND Biomphalaria tenagophila INFECTED WITH Schistosoma mansoni

• Published in: Revista do Instituto de Medicina Tropical de São Paulo
• Main Authors: F. S. de M. BEZERRA, J. A. NOGUEIRA-MACHADO, M. M. CHAVES, R. L. MARTINS, P. M. Z. COELHO
• Format: Article in Journal/Newspaper
• Language: English
• Published: Universidade de São Paulo (USP) 1997
• Subjects: Schistosoma mansoni; Hemocytes; Biomphalaria; Arctic medicine. Tropical medicine; RC955-962; Infectious and parasitic diseases; RC109-216; Arctic
• Online Access: https://doi.org/10.1590/S0036-46651997000400003; https://doaj.org/article/e30a7e107ad143ed84fd131d2e8314d8

Among the determinant factors in the resistance and susceptibility of Biomphalaria to Schistosoma mansoni, hemocytes play an important role. Aiming at studying S. mansoni/Biomphalaria interactions related to hemocytes, the first step is certainly connected with the standardization of this cell population in uninfected Biomphalaria. In this way, quantification of this cell population in hemolymph, as well as its phagocitary capacity, have been determined for the first time. Furthermore, using susceptible and resistant strains of B. glabrata and B. tenagophila, the hemocytegram and phagocytary capacity of hemocytes after infection with S. mansoni were determined too. Resistant and susceptible strains of B.glabrata (BA and BH, respectively), as well as resistant and susceptible strains of B. tenagophila (Taim and CF, respectively) were infected with 10 miracidia of the LE and SJ strains of S. mansoni, respectively. These infected snails and respective uninfected controls were assessed in relation to the number of circulating hemocytes and alteration in the phagocytary capacity, by using Zymozan and MTT. Reading was taken by means of a spectrophotometer at 5 hours and 1,2,5,10,20 and 30 days after infection. The results showed a decrease in population of the circulating phagocytary cells, 5 hours after infection. One day post-infection, the circulating cells of the susceptible snails showed an increased metabolic activity, but the same event could not be observed in the resistant strains. In the subsequent observation periods, significant differences among the strains studied could not be observed until the end of the experiment Quantificação da população e atividade fagocitária de hemócitos de cepas resistentes e suscetíveis de Biomphalaria glabrata e Biomphalaria tenagophila infectadas com Schistosoma mansoni Entre os fatores determinantes na resistência e suscetibilidade da Biomphalaria ao Schistosoma mansoni, os hemócitos desempenham importante papel. Com o objetivo de estudar as interações S. ...