scholarly journals Synergistic action of praziquantel and host specific immune response against Schistosoma mansoni at different phases of infection

2004 ◽  
Vol 46 (4) ◽  
pp. 231-233 ◽  
Author(s):  
Fabio Ribeiro ◽  
Rômulo Teixeira de Mello ◽  
Carlos Alberto Pereira Tavares ◽  
John Robert Kusel ◽  
Paulo Marcos Zech Coelho
Keyword(s):  
Immune Response ◽  
Schistosoma Mansoni ◽  
Worm Burden ◽  
Synergistic Action ◽  
Specific Immune Response ◽  
Concomitant Immunity

The interaction between specific immune response to Schistosoma mansoni and praziquantel (PZQ) was studied in mice. In mice harboring concomitant immunity, 6-day-old parasites treated with PZQ were more effectively removed than 24h treated parasites despite both had a significant worm burden reduction when compared with respective treated controls. These results show that PZQ can be effective at the skin and lung stages of parasite's development mainly acting with a established specific immune response, and particularly at the lung phase.

Immunization efficacy of ozone-exposed cercariae against subsequent Schistosoma mansoni challenge infection

2011 ◽  
Vol 61 (3) ◽  
pp. 289-301
Author(s):  
Azza H. Mohamed
Keyword(s):  
Schistosoma Mansoni ◽  
Worm Burden ◽  
Structural Changes ◽  
Relative Weight ◽  
Challenge Infection ◽  
Total Leukocyte Count ◽  
Post Challenge ◽  
Igg Antibody ◽  
Sem Images ◽  
Infected Control

AbstractCD1 mice were immunized subcutaneously with 20 ozone-exposed (70μg/ml, 1 minute exposure) Schistosoma mansoni cercariae weekly/three weeks. The efficacy of immunization was assessed 10 weeks post challenge infection by the determination of the worm burden, ova count, oogram, granuloma diameter, IgG reactions against soluble egg antigen (SEA) and tegument structural changes of recovered worms that are immunized. A reduced worm length and a reduction in worm burden were observed in the immunized group as compared to the infected not immunized group. Moreover, no ova were found in liver and intestine from the immunized mice as compared with infected control mice. Also, immunization with ozonated cercariae showed a decrement in the mean relative weight of liver and spleen. Total leukocyte count was increased in the immunized animal as compared to the infected control. The level of total IgG antibody against SEA decreased in immunized mice as compared with the infected control mice. Scanning electron microscope (SEM) images of worms recovered 10 weeks post challenge from the immunized group revealed extensive tegumental destruction. This study underlines the significant role of ozone attenuated cercariae vaccine against S. mansoni infection, which generated specific immunity with a significant level of protection.

scholarly journals Adenoviral Type 35 and 26 Vectors with a Bidirectional Expression Cassette in the E1 Region Show an Improved Genetic Stability Profile and Potent Transgene-Specific Immune Response

2018 ◽  
Vol 29 (3) ◽  
pp. 337-351
Author(s):  
Marija Vujadinovic ◽  
Kerstin Wunderlich ◽  
Benoit Callendret ◽  
Marina Koning ◽  
Mark Vermeulen ◽  
...  
Keyword(s):  
Immune Response ◽  
Genetic Stability ◽  
Expression Cassette ◽  
Specific Immune Response

The possible role of the frontal and sub-parietal gland systems of the pentastomidReighardia sternae(Diesing, 1864) in the evasion of the host immune response

Parasitology ◽  
1979 ◽  
Vol 78 (1) ◽  
pp. 53-66 ◽  
Author(s):  
J. Riley ◽  
J. L. James ◽  
A. A. Banaja
Keyword(s):  
Immune Response ◽  
Alternative Explanation ◽  
Surface Membrane ◽  
Membrane System ◽  
Host Immune Response ◽  
Entire Surface ◽  
Strong Immune Response ◽  
Concomitant Immunity ◽  
Host Parasite

SUMMARYThe frontal and sub-parietal glands of the pentastomidReighardia sternaeelaborate lamellate secretion which is poured on to the cuticle. The entire surface of the cuticle, including the mouth, hook pits and reproductive apertures, is coated with secretion. Electron microscope studies indicate that the glands are continuously active, which implies a turnover of surface membranes. The postulated function of these membranes is to protect certain vital areas of the host–parasite interface, notably the pores of ion-transporting cells, from the host immune response. The available evidence suggests that pentastomids do evoke a strong immune response but since most are long-lived they must circumvent it. We believe the surface membrane system to be instrumental in this. Studies on another pentastomid,Porocephalus crotaliin rats have shown that an immune response stimulated by a primary infection will kill subsequent infections and that the surface membranes are strongly immunogenic. Obvious parallels between this situation and that of schistosome infections in mammals are discussed. An alternative explanation of concomitant immunity is proposed.

scholarly journals Evaluation of specific immune response in early P. aeruginosa infection in cystic fibrosis patients

2014 ◽  
Vol 13 (1) ◽  
pp. 116-117 ◽  
Author(s):  
Daniela Dolce ◽  
Lisa Cariani ◽  
Silvia Campana ◽  
Novella Ravenni ◽  
Gianfranco Mergni ◽  
...  
Keyword(s):  
Cystic Fibrosis ◽  
Immune Response ◽  
Specific Immune Response
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