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3-D Imaging and Analysis of Neurons Infected In Vivo with Toxoplasma gondii
Published on: December 9, 2014
Comparative Immunopathology of Toxoplasma gondii Natural Infections in Marmosets (Callithrix spp.) and Howler Monkeys
Marina Pellegrino1, Alessandra L M Santos1, Cinthya Dos Santos Cirqueira2
1Laboratory of Wildlife Comparative Pathology, School of Veterinary Medicine and Animal Sciences, University of São Paulo, São Paulo, Brazil.
Introduction:
Neotropical primates (NTPs) present varying susceptibility to toxoplasmosis caused by Toxoplasma gondii, but their immunopathogenic responses remain poorly understood.
Materials And Methods:
Local immune responses were characterized in the liver, spleen, and central nervous system (CNS) of 50 naturally infected NTPs (31 Callithrix spp.; 19 Alouatta spp.) by immunohistochemistry. Splenic white pulp morphometry, CD3+ T lymphocyte, Iba1+ macrophage/microglia, polymorphonuclear neutrophil quantification, and IFN-γ and IL-10 semi-quantification were performed.
Results:
Both genera exhibited splenic white pulp hyperplasia. Within genera, marmosets showed predominant CD3+ infiltrates in the spleen and histiocytic infiltrates in the liver and CNS, whereas howler monkeys exhibited predominantly histiocytic infiltrates in all tissues. Between genera, marmosets had significantly higher splenic CD3+ T-cell (p < 0.05), Iba1+ macrophage (p = 0.030), and IFN-γ (p = 0.018) immunolabeling than howler monkeys.
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