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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Fesus, L. Amendola, A. Gougeon, M. L. Poccia, F. Bondurand, A. Piacentini, M. |
| Description | Author Affiliation: Amendola A ( Department of Biology, University of Rome Tor Vergata, Italy.); |
| Abstract | Peripheral blood mononuclear cells and lymphoid tissues from HIV-infected individuals display high levels of 'tissue' transglutaminase (tTG) with respect to seronegative persons. In asymptomatic individuals, > 80% of the circulating CD4+ T cells synthesize tTG protein and the number of these cells matches the level of apoptosis detected in the peripheral blood mononuclear cells from the same patients. In HIV-infected lymph nodes tTG protein is localized in large number of cells (macrophages, follicular dendritic cells, and endothelial cells), showing distinctive morphological and biochemical features of apoptosis as well as in lymphocytes and syncytia. These findings demonstrate that during the course of HIV infection, high levels of apoptosis also occur in the accessory cells of lymphoid organs. The increased concentration of epsilon(gamma-glutamyl)lysine isodipeptide, the degradation product of tTG cross-linked proteins, observed in the blood of HIV-infected individuals demonstrates that the enzyme accumulated in the dying cells actively cross-links intracellular proteins. The enhanced levels of epsilon(gamma-glutamyl)lysine in the blood parallels the progression of HIV disease, suggesting that the isodipeptide determination might be a useful method to monitor the in vivo rate of apoptosis. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 20 |
| Volume Number | 93 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1996-11-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Apoptosis CD4-Positive T-Lymphocytes Enzymology GTP Phosphohydrolases Metabolism GTP-Binding Proteins HIV Infections Transglutaminases DNA Fragmentation Dipeptides Blood Pathology HIV-1 HIV-2 Immunophenotyping Lymphoid Tissue Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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