Neuronal changes caused by Trypanosoma cruzi: an experimental model

Area of Science:

• Neuroscience
• Infectious Diseases
• Gastroenterology

Background:

• Chagas disease, caused by Trypanosoma cruzi, affects the enteric nervous system.
• Myenteric neurons in the colon are crucial for gastrointestinal motility.
• Understanding neuronal damage is key to managing Chagas disease complications.

Purpose of the Study:

• To establish an experimental model of Trypanosoma cruzi infection in mice.
• To quantitatively and morphometrically analyze changes in colonic myenteric neurons.
• To correlate neuronal alterations with parasite load and infection duration.

Main Methods:

• Swiss male mice were infected with 100 or 1000 Trypanosoma cruzi trypomastigotes.
• Parasitemia was monitored, and a chronic phase was induced with Benznidazole treatment.
• Colon tissues were collected at 18, 30, and 75 days post-inoculation for Giemsa staining and neuronal analysis.

Main Results:

• Trypanosoma cruzi infection led to a significant decrease in neuronal density at 30 and 75 days post-inoculation.
• Neuronal hypertrophy and death were observed at 75 days post-inoculation in infected groups.
• Observed neuronal changes correlated directly with the inoculum dose and infection time.

Conclusions:

• Trypanosoma cruzi infection induces significant, time- and dose-dependent damage to colonic myenteric neurons.
• This experimental model effectively demonstrates neuronal loss and morphological alterations relevant to Chagas disease.
• Findings highlight the neuropathic potential of Trypanosoma cruzi in the enteric system.