The Effect of Size of M Line Biomphalaria glabrata on the Course of Development of Echinostoma paraensei

1987 ◽  
Vol 73 (6) ◽  
pp. 1090 ◽  
Author(s):  
Eric S. Loker ◽  
Daniel F. Cimino ◽  
Gabrielle A. Stryker ◽  
Lynn A. Hertel
Keyword(s):  
Biomphalaria Glabrata ◽  
Echinostoma Paraensei

scholarly journals Lipid levels in Biomphalaria glabrata infected with different doses of Echinostoma paraensei miracidia

2011 ◽  
Vol 128 (3) ◽  
pp. 212-216 ◽  
Author(s):  
Vinícius Menezes Tunholi-Alves ◽  
Victor Menezes Tunholi ◽  
Patrícia Gôlo ◽  
Danilo Lustrino ◽  
Arnaldo Maldonado ◽  
...  
Keyword(s):  
Biomphalaria Glabrata ◽  
Lipid Levels ◽  
Different Doses ◽  
Echinostoma Paraensei

Effects of infection with Echinostoma paraensei on the circulating haemocyte population of the host snail Biomphalaria glabrata

Parasitology ◽  
1989 ◽  
Vol 98 (1) ◽  
pp. 35-41 ◽  
Author(s):  
S. Noda ◽  
E. S. Loker
Keyword(s):  
Post Infection ◽  
Phase Contrast ◽  
Relative Concentration ◽  
Biomphalaria Glabrata ◽  
Absolute Abundance ◽  
Host Snail ◽  
Relative Percentage ◽  
Foreign Surface ◽  
Echinostoma Paraensei

SummaryCirculating haemocytes from Echinostoma paraensei-infected M line Biomphalaria glabrata snails, or from age- and sizematched control snails, were studied on plastic slides with phase-contrast optics. Granulocytes, hyalinocytes, and round cells were consistently present; granulocytes were further categorized as ‘fully spread' (FS) or ‘partially spread' (PS). Among control snails, the relative percentage and estimated number/mm3 of round cells declined significantly with increased snail size, and the corresponding values for both categories of granulocytes increased. At 1 day post-infection (p.i.) with E. paraensei, overall composition of the haemocyte population was relatively unaffected, but by 8 days p.i. infected snails had significantly higher relative percentages of round cells and PS granulocytes than controls. Because a marked increase in the number of circulating haemocytes is also evident by 8 days p.i., infected snails had approximately 12 times more round cells and PS granulocytes/mm3 of haemolymph than did controls. At 30 days p.i. the relative and absolute abundance of PS granulocytes was still significantly elevated, but otherwise haemocyte populations did not differ from control snails. Alterations in granulocyte size in infected snails were also noted. Infection with E. paraensei has a striking impact of circulating haemocyte populations and also increases the relative concentration of haemocytes with less ability to adhere to a foreign surface.

Biomphalaria glabrata Hemolymph Lectins: Binding to Bacteria, Mammalian Erythrocytes, and to Sporocysts and Rediae of Echinostoma paraensei

1994 ◽  
Vol 64 (1) ◽  
pp. 52-61 ◽  
Author(s):  
Lynn A. Hertel ◽  
Stephen A. Stricker ◽  
Fernando P. Monroy ◽  
Wade D. Wilson ◽  
Eric S. Loker
Keyword(s):  
Biomphalaria Glabrata ◽  
Echinostoma Paraensei

Elevated agglutination titres in plasma of Biomphalaria glabrata exposed to Echinostoma paraensei: characterization and functional relevance of a trematode-induced response

Parasitology ◽  
1994 ◽  
Vol 108 (1) ◽  
pp. 17-26 ◽  
Author(s):  
E. S. Loker ◽  
L. Couch ◽  
L. A. Hertel
Keyword(s):  
Fold Increase ◽  
Biomphalaria Glabrata ◽  
Parasite Development ◽  
Induced Response ◽  
Unexposed Control ◽  
Functional Relevance ◽  
Echinostoma Paraensei

SUMMARYProduction of elevated haemolymph agglutination titres by Biomphalaria glabrata following exposure to Echinostoma paraensei miracidia was investigated, to characterize this parasite-induced response and to understand its functional relevance. Both the dose of infection (1, 10 or 100 miracidia per snail) or the number of separate exposures to infection (between one and three, over a 4 or 8 day interval) were varied, and assuming a threshold dosage (10 miracidia per snail or higher) was exceeded, titres of juvenile snails peaked at 8–16 times the values for unexposed control snails, regardless of the exposure regimen. Adult snails, which are relatively refractory to infection, have slightly higher resting titres than juveniles, but exhibit only a 2- to 4-fold increase in titre following exposure. Juveniles exposed to infection but lacking demonstrable infection had lower titres than snails with confirmed infections. Exposure to infection increased heterogeneity of plasma agglutinins and provoked production of unique specificities not found in unexposed snails. However, the overall pattern of agglutination responses for snails with successfully developed parasites did not differ from those in which parasite development was unsuccessful. Agglutinating activity was inhibitable by several different monosaccharides, although plasma from infected snails was relatively unaffected by N-acetyl-glucosamine or N-acetyl-galactosamine. Wounding of snails provoked no change in plasma agglutination activity. As the highest agglutination titres were produced in snails with successfully developing parasites and agglutinin composition did not differ between snails with successful or unsuccessful parasites, the functional relevance of the response remains enigmatic. The production of unique agglutinins following exposure deserves additional study.

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