Abstract:
:Several T cell abnormalities have been described in the course of acute Trypanosoma cruzi infection in mice, including severe effects on the thymus. In the present study, looking at the expression of extracellular matrix ligands in the thymus, we observed that deposits of fibronectin and laminin increased progressively during the course of infection, reaching a maximum at the peak of parasitemia and thymic atrophy. Concomitantly, membrane expression of fibronectin and laminin receptors (VLA-4, VLA-5 and VLA-6) was also enhanced on thymocyte subsets of infected mice. These results correlated with changes in intrathymic thymocyte migration ability during the acute phase of infection, when a higher fibronectin-dependent transmigratory activity of CD4(+)CD8(+) thymocytes was observed. Strikingly, we detected higher frequency of immature and high VLA-expressing CD4(+)CD8(+) T cells in the peripheral lymphoid organs of infected mice at the peak of parasitemia. These cells seemed to be thymus dependent, since significantly lower amounts of them were found in thymectomized mice, and some of them carry "prohibited" Vbeta segments of the TCR. Our data suggest an imbalance in the intrathymic cell trafficking following acute T. cruzi infection, likely due to dysregulated extracellular matrix-dependent interactions.
journal_name
Eur J Immunoljournal_title
European journal of immunologyauthors
Cotta-de-Almeida V,Bonomo A,Mendes-da-Cruz DA,Riederer I,De Meis J,Lima-Quaresma KR,Vieira-de-Abreu A,Villa-Verde DM,Savino Wdoi
10.1002/eji.200323860keywords:
subject
Has Abstractpub_date
2003-09-01 00:00:00pages
2439-48issue
9eissn
0014-2980issn
1521-4141journal_volume
33pub_type
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