Chronobiological aspects of the host-parasite relationships between Biomphalaria glabrata and Schistosoma mansoni: Cercarial production and infectivity, and growth kinetics of the host

1984 ◽  
Vol 44 (2) ◽  
pp. 209-213 ◽  
Author(s):  
A. Théron ◽  
H. Moné
Keyword(s):  
Schistosoma Mansoni ◽  
Growth Kinetics ◽  
Biomphalaria Glabrata ◽  
Cercarial Production ◽  
Host Parasite ◽  
Kinetics Of

Interactions between the plasma proteins of Biomphalaria glabrata (Gastropoda) and the sporocyst tegument of Schistosoma mansoni (Trematoda)

Parasitology ◽  
1986 ◽  
Vol 92 (3) ◽  
pp. 653-664 ◽  
Author(s):  
C. J. Bayne ◽  
E. S. Loker ◽  
Mary A. Yui
Keyword(s):  
Schistosoma Mansoni ◽  
Plasma Proteins ◽  
Biomphalaria Glabrata ◽  
Rabbit Antibody ◽  
Tegumental Surface ◽  
Immunological Interactions ◽  
Resistant Strains ◽  
Host Parasite ◽  
Susceptibility And Resistance

SUMMARYThe tegumental surface of Schistosoma mansoni sporocysts is the site of both nutritive and immunological interactions with haemolymph cells and plasma of Biomphalaria glabrata, the schistosome intermediate host. Within minutes of being placed in host plasma, sporocysts acquire plasma antigens, and within 3 h host plasma antigens are present on the surface at near steady state. Though a wide variety of peptides is acquired, there is selection. Furthermore, some differences occur in the peptides acquired from the plasma of susceptible and resistant strains of snail. Acquired antigens are rapidly processed, and are predominantly undetectable in tegumental extracts after a few hours. In contrast, rabbit antibody on sporocysts remains in situ for at least 48 h, so under some conditions there is stable expression of certain tegumental antigenic determinants.These data, obtained using antibodies to snail plasma antigens and to sporocyst tegumental antigens, are discussed in the light of current ideas on the cellular and molecular basis of susceptibility and resistance in this host#parasite system.

Transient non-susceptibility toSchistosoma mansoniassociated with atrial amoebocytic accumulations in the snail hostBiomphalaria glabrata

Parasitology ◽  
1987 ◽  
Vol 95 (3) ◽  
pp. 499-505 ◽  
Author(s):  
C. S. Richards ◽  
D. J. Minchella
Keyword(s):  
Population Dynamics ◽  
Schistosoma Mansoni ◽  
Genetic Control ◽  
Old Age ◽  
Biomphalaria Glabrata ◽  
Egg Laying ◽  
Snail Population ◽  
Host Parasite ◽  
Variable Susceptibility

SUMMARYIn someBiomphalaria glabrata–Schistosoma mansonicombinations snails are susceptible to infection as juveniles, but have variable susceptibility as adults. These snails become non-susceptible at the onset of egg-laying and typically revert to susceptibility in old age. Certain stocks ofB. glabratahave the capacity to form amoebocytic accumulations in the atrium, and this ability is under genetic control. The atrial amoebocytic accumulations are transitory, typically appearing at onset of egg-laying and disappearing after a few months. A snail stock which has genetic tendencies for both adult variable susceptibility and atrial amoebocytic accumulations was studied. An association between the time of occurrence of adult non-susceptibility and atrial accumulation is revealed as snails never became infected withS. mansoniwhen amoebocytic accumulations were present. Developing parasites, however, were not necessarily encapsulated and destroyed by amoebocytes. Some sporocysts were able to delay development until the amoebocytic accumulations disappeared. The timing of atrial amoebocytic accumulations and resulting transient non-susceptibility in this host-parasite combination could influence snail population dynamics.

Geographical variations in infectivity and susceptibility in the host-parasite system Schistosoma mansoni/Biomphalaria glabrata: no evidence for local adaptation

Parasitology ◽  
2006 ◽  
Vol 133 (3) ◽  
pp. 313-319 ◽  
Author(s):  
F. PRUGNOLLE ◽  
T. DE MEEÛS ◽  
J.P. POINTIER ◽  
P. DURAND ◽  
A. ROGNON ◽  
...  
Keyword(s):  
Schistosoma Mansoni ◽  
Local Adaptation ◽  
Genetic Factors ◽  
Biomphalaria Glabrata ◽  
Metapopulation Dynamics ◽  
Geographical Variations ◽  
Transplantation Experiment ◽  
Host Parasite ◽  
Parasite Populations ◽  
Transplantation Experiments

We investigated local adaptation in the spatially structured natural Biomphalaria glabrata/Schistosoma mansoni host-parasite system in the marshy forest focus of Guadeloupe using cross-transplantation experiments. We demonstrated strong and highly significant variations in susceptibility/infectivity of host and parasite populations, respectively, but found no evidence of local adaptation neither for S. mansoni nor for B. glabrata. Environmental as well as genetic factors are discussed to explain susceptibility/infectivity variations between both host and parasite populations. The absence of local adaptation is discussed in relation to the metapopulation dynamics of both host and parasite, in particular their relative rates of dispersal at the scale under scrutiny. Our study constitutes the first cross-transplantation experiment concerning this host-parasite system of which both hosts and parasites came directly from the wild, excluding laboratory generations and experimental host passages.

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