Objective Interleukin-7 promotes survival and proliferation of lymphocytes both during thyrnic maturation and also in the case of mature peripheral cells. In HTV-infected individuals and in clinical settings, which result in T cell depletion an increase of serum, IL-7 concentration was found. Increased production of IL-7 in response to T cell loss is considered as a homeostatic response mechanism aiming at the restoration of peripheral T cell number. In our previous studies we found a decreased level of IL-7R in HIV-infected patients and the decrease of the receptor was correlated with the level of T cell depletion and also with the increase of serum IL-7 concentrations. These results suggest that low IL-7R expression of T cells may contribute to the loss of T lymphocytes in HIV-infected individuals and may also limit the positive effects of the high IL-7 concentration on T cells.Our research objectives discussed in the proposal are the following:1) Assay the hypothesis that low IL-7R expression of T lymphocytes in HIV positive subjects may result in survival disadvantage for peripheral T lymphocytes. Analyse if known apoptosis regulatory molecules are affected in 1L-7R negative T cells from HIV patients.2) Analyse if dendritic cells (DC) can produce IL-7 and characterise those factors of DC maturation and activation, which regulate IL-7 expression. Test the hypothesis if DC can present IL-7 to T cells by binding the cytokine to the extracellular matrix with a similar mechanism described in the case of bone marrow stromal cells.3) Analysis of the production and functon of the soluble IL-7Ra protein. We plan to screen which cells produce the soluble form of the IL-7R and analyse if the soluble receptor can interfere with the effects of IL-7.4) Analyse if IL-7 plays a role in the regulation of HIV tropism.Our research may open new lines of thinking in field of T cell homeostasis in HIV-infected individuals. Fields of science natural sciencesbiological sciencesbiochemistrybiomoleculesproteinsmedical and health scienceshealth sciencesinfectious diseasesRNA virusesHIVmedical and health sciencesbasic medicinephysiologyhomeostasis Keywords 7 HIV Interleukin T cell homeostatis Programme(s) FP6-MOBILITY - Human resources and Mobility in the specific programme for research, technological development and demonstration "Structuring the European Research Area" under the Sixth Framework Programme 2002-2006 Topic(s) MOBILITY-2.1 - Marie Curie Intra-European Fellowships (EIF) Call for proposal FP6-2002-MOBILITY-5 See other projects for this call Funding Scheme EIF - Marie Curie actions-Intra-European Fellowships Coordinator KAROLINSKA INSTITUTET Address Nobels vaeg 1 Stockholm Sweden See on map EU contribution € 0,00
