6 documents found, page 1 of 1
Thymic function as a predictor of immune recovery in chronically HIV-infected p...
Rb-Silva, Rita; Nobrega, Claudia; Azevedo, Cecilia; Athayde, Emilia; Canto-Gomes, João; Ferreira, Ivo; Cheynier, Rémi; Yates, Andrew J.; Horta, AnaPoor immunological responders (PIR) are HIV-infected patients with virologic suppression upon antiretroviral therapy (ART) but persistently low CD4+ T cell counts. Early identification of PIR is important given their higher morbimortality compared to adequate immune responders (AIR). In this study, 33 patients severely lymphopenic at ART onset, were followed for at least 36 months, and classified as PIR or AIR ...
Major CD4 T-cell depletion and immune senescence in a patient with chronic gran...
Albuquerque, Adriana S.; Fernandes, Susana M.; Tendeiro, Rita; Cheynier, Rémi; Lucas, Margarida; Silva, Susana L.; Victorino, Rui M. M.; Sousa, Ana E.Chronic granulomatous disease (CGD) results from primary defects in phagocytic reactive oxygen species (ROS) production. T-cell evaluation is usually neglected during patients' follow-up, although T-cell depletion has been reported in CGD through unknown mechanisms. We describe here a 36-year-old patient with X-linked CGD with severe CD4 T-cell depletion <200 CD4 T-cells/μl, providing insights into the mechanis...
IL-7-induced proliferation of human naive CD4 T-cells relies on continued thymi...
Silva, Susana L.; Albuquerque, Adriana S.; Matoso, Paula; Charmeteau-de-Muylder, Bénédicte; Cheynier, Rémi; Ligeiro, Dário; Abecasis, Miguel; Anjos, RuiNaive CD4 T-cell maintenance is critical for immune competence. We investigated here the fine-tuning of homeostatic mechanisms of the naive compartment to counteract the loss of de novo CD4 T-cell generation. Adults thymectomized in early childhood during corrective cardiac surgery were grouped based on presence or absence of thymopoiesis and compared with age-matched controls. We found that the preservation of...
Autoimmunity and allergy control in adults submitted to complete thymectomy ear...
Silva, Susana L.; Albuquerque, Adriana; Amaral, Andreia J.; Li, Quan-Zhen; Mota, Catarina; Cheynier, Rémi; Victorino, Rui M. M.The contribution of the decline in thymic activity for the emergence of autoimmunity is still debatable. Immune-competent adults submitted to complete thymectomy early in life provide a unique model to address this question. We applied here strict criteria to identify adults lacking thymic activity based on sjTREC levels, to exclude thymic rebound and/or ectopic thymuses. In agreement, they featured severe naïv...
Human naïve regulatory T-cells feature high steady-state turnover and are maint...
Silva, Susana L.; Albuquerque, Adriana S.; Serra-Caetano, Ana; Foxall, Russell B.; Pires, Ana R.; Matoso, Paula; Fernandes, Susana M.; Ferreira, JoãoNaïve FoxP3-expressing regulatory T-cells (Tregs) are essential to control immune responses via continuous replenishment of the activated-Treg pool with thymus-committed suppressor cells. The mechanisms underlying naïve-Treg maintenance throughout life in face of the age-associated thymic involution remain unclear. We found that in adults thymectomized early in infancy the naïve-Treg pool is remarkably well pre...
CD4+ recent thymic emigrants are infected by HIV in vivo, implication for patho...
Fabre-Mersseman, Véronique; Dutrieux, Jacques; Louise, Anne; Rozlan, Sandra; Lamine, Aurélia; Parker, Raphaëlle; Rancez, Magali; Nunes-Cabaço, HelenaOBJECTIVE: The contribution of naive CD4+ T cells to the pool of HIV-infected cells remains poorly described. This study aimed at evaluating HIV infection in naive T-cell subsets in viremic and HAART-treated patients, together with various parameters implicated in naive T-cell homeostasis, in order to better understand infection in these subsets. DESIGN AND METHODS: HIV provirus was quantified in various FACS-s...