Life sciences

Toxoplasma gondii infection causes structural changes in the jejunum of rats infected with different inoculum doses.

PMID 29079467


To evaluate the mucosal tunic and submucosal plexus of the jejunum of rats infected with different inoculum doses of Toxoplasma gondii. Rats were infected with different inoculum doses (50, 500, 1000 and 5000 oocysts) of the T. gondii for 30days, while a control group (CG) received saline solution. Blood and feces were collected before euthanasia for analysis of blood and fecal leukocytes (LEs). Histological analysis of the mucosa, submucosa, villi, crypts and enterocytes were performed. Goblet cells, intraepithelial lymphocytes (IELs) and Paneth cells were quantified. Immunohistochemistry was used to assess enteroendocrine serotonergic (5HT-IR) cells, proliferative cells (PCNA An increase in blood LEs was observed 30days post-infection (dpi). Fecal LEs were more abundant in the feces in all infected groups at 21 dpi when compared to the CG. The number of IELs, sulfomucin-producing goblet cells, Paneth cells, PCNA The results show how chronic toxoplasmic infection affects the tissue and cellular composition of the rat jejunum. These structural changes tend to intensify with the inoculum dose, demonstrating the importance of the parasitic load on intestinal alterations.