Trypanosoma cruzi infection results in an increase in intracellular cholesterol

Area of Science:

• Cardiovascular Diseases
• Infectious Diseases
• Molecular Biology

Background:

• Chagasic cardiomyopathy, caused by Trypanosoma cruzi, is a significant health issue.
• Trypanosoma cruzi utilizes host low-density lipoprotein receptor (LDLr) for invasion, showing an affinity for lipoproteins.

Purpose of the Study:

• To investigate the role of cholesterol accumulation in Trypanosoma cruzi infection and Chagasic cardiomyopathy.
• To explore the mechanisms by which T. cruzi affects host cell cholesterol homeostasis.

Main Methods:

• Analysis of tissue samples from murine models of acute and chronic Chagas disease.
• Examination of tissue from a human Chagasic cardiomyopathy case.
• In vitro studies of T. cruzi infection in cultured cells with varying cholesterol levels.
• Investigation of intracellular cholesterol regulation in infected host cells.

Main Results:

• T. cruzi infection was associated with LDL and cholesterol accumulation in tissues of infected mice and a human patient.
• Increased cholesterol levels in the culture medium enhanced T. cruzi invasion of host cells.
• Infected host cells exhibited altered cholesterol regulation.
• T. cruzi invasion via LDLr appears to mediate changes in intracellular cholesterol homeostasis.

Conclusions:

• Trypanosoma cruzi infection disrupts host cholesterol homeostasis, leading to lipid accumulation.
• Elevated intracellular lipids and associated oxidative stress may contribute to the pathogenesis of Chagasic cardiomyopathy.
• Targeting LDLr-mediated invasion and cholesterol metabolism could be a therapeutic strategy for Chagas disease.