title: Oral dependent-dose toxoplasmic infection model induced by oocysts in rats: Myenteric plexus and jejunal wall changes.
abstract: Toxoplasmosis is a widely distributed disease caused by the protozoan Toxoplasma gondii that is mainly transmitted orally. Once ingested, the parasite crosses the intestinal barrier to reach the blood and lymph systems to migrate to other regions of the host. The objective of this study was to evaluate the changes in the myenteric plexus and the jejunal wall of Wistar rats caused by oral infection with T. gondii oocysts (ME-49 strain). Inocula of 10, 100, 500 and 5000 oocysts were used. The total population of myenteric neurons and the most metabolically active subpopulation (NADH-diaphorase positive - NADH-dp) exhibited a decrease proportional to the dose of T. gondii. There was also a quantitative increase in the subpopulation of NADPH-diaphorase-positive (NADPH-dp) myenteric neurons, indicating greater expression of the NOS enzyme. Neuronal atrophy was observed, and morphological and morphometric alterations such as jejunal atrophy were found in the infected groups. Hypertrophy of the external muscle with the presence of inflammatory foci was observed in the group infected with 5000 oocysts. The changes observed in the infected groups were proportional to the number of oocysts inoculated.
authors.affiliation: State University of Maringa, Av. Colombo, 5.790, 87020-900 Maringá, PR, Brazil.
authors.forename: Suellen Laís
authors.initials: SL
authors.lastname: Vicentino-Vieira
authors.affiliation: State University of Maringa, Av. Colombo, 5.790, 87020-900 Maringá, PR, Brazil.
authors.forename: Gessilda de Alcantara
authors.initials: Gde A
authors.lastname: Nogueira de Melo
authors.affiliation: State University of Maringa, Av. Colombo, 5.790, 87020-900 Maringá, PR, Brazil.
authors.forename: Marcelo
authors.initials: M
authors.lastname: Biondaro Góis
authors.affiliation: State University of Maringa, Av. Colombo, 5.790, 87020-900 Maringá, PR, Brazil.
authors.forename: Neide
authors.initials: N
authors.lastname: Martins Moreira
authors.affiliation: State University of Maringa, Av. Colombo, 5.790, 87020-900 Maringá, PR, Brazil.
authors.forename: Luana Gabriela
authors.initials: LG
authors.lastname: de Araujo Pereira
authors.affiliation: State University of Londrina, Rodovia Celso Garcia Cid, PR 445, km 380, 86057-970 Londrina, PR, Brazil.
authors.forename: Eduardo José
authors.initials: EJ
authors.lastname: de Almeida Araújo
authors.affiliation: State University of Londrina, Rodovia Celso Garcia Cid, PR 445, km 380, 86057-970 Londrina, PR, Brazil.
authors.forename: João Luiz
authors.initials: JL
authors.lastname: Garcia
authors.affiliation: State University of Maringa, Av. Colombo, 5.790, 87020-900 Maringá, PR, Brazil. Electronic address: dmgsantana@gmail.com.br.
authors.forename: Débora
authors.initials: D
authors.lastname: de Mello Gonçales Sant'Ana
mesh_terms: D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood; D004195:Disease Models, Animal; D006651:Histocytochemistry; D007074:Immunoglobulin G / Q000097:blood; D007583:Jejunum / Q000473:pathology*; D008297:Male; D009197:Myenteric Plexus / Q000473:pathology*; D009243:NAD; D009249:NADP; D009474:Neurons / Q000473:pathology; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D014122:Toxoplasma / Q000276:immunology; D014124:Toxoplasmosis, Animal / Q000473:pathology*
chemical_list: D000913:Antibodies, Protozoan; D007074:Immunoglobulin G; D009243:NAD; D009249:NADP
keywords: Enteric nervous system; Histopathology; Oocysts; Toxoplasmosis; Wistar rat