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| Content Provider | PubMed Central |
|---|---|
| Author | Mucci, Juan Hidalgo, Alejandra Esteban, Mocetti Argibay, Pablo F. Susana, Leguizamón M. Oscar, Campetella |
| Copyright Year | 2002 |
| Abstract | Trypanosoma cruzi, the causative agent of Chagas' disease, induces transient thymic aplasia early after infection—a phenomenon that stills lacks a molecular explanation. The parasite sheds an enzyme known as trans-sialidase (TS), which is able to direct transfer-sialyl residues among macromolecules. Because cell-surface sialylation is known to play a central role in the immune system, we tested whether the bloodstream-borne TS is responsible for the thymic alterations recorded during infection. We found that recombinant TS administered to naive mice was able to induce cell-count reduction mediated by apoptosis, mimicking cell subsets distribution and histologic findings observed during the acute phase of the infection. Thymocytes taken after TS treatment showed low response to Con A, although full ability to respond to IL-2 or IL-2 plus Con A was conserved, which resembles findings from infected animals. Alterations were found to revert several days after TS treatment. The administration of TS-neutralizing Abs to T. cruzi-infected mice prevented thymus alterations. Results indicate that the primary target for the TS-induced apoptosis is the so-called “nurse cell complex”. Therefore, we report here supporting evidence that TS is the virulence factor from T. cruzi responsible for the thymic alterations via apoptosis induction on the nurse cell complex, and that TS-neutralizing Abs elicitation during infection is associated with the reversion to thymic normal parameters. |
| Related Links | http://dx.doi.org/10.1073/pnas.052496399 |
| Ending Page | 3901 |
| Page Count | 6 |
| Starting Page | 3896 |
| File Format | |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 6 |
| Volume Number | 99 |
| Language | English |
| Publisher | The National Academy of Sciences |
| Publisher Date | 2002-03-19 |
| Access Restriction | Open |
| Rights Holder | The National Academy of Sciences |
| Subject Keyword | General Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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