Immunology of the Infection Perinatal

HIV Infections

immune status, adolescents or young adults infected, impact of viral replication

ANRS-EP38-IMMIP is a non interventional study. A single blood sample (30 mL) was drawn during a hospital visit for clinical follow-up. Immunological assays were performed on fresh blood. Cells and plasma were stored and kept frozen for additional biological evaluations. Patients are included in the French perinatal cohort (ANRS CO-10), or have been followed since before 1996 in the same clinical sites as patients who belong to ANRS CO-10. In the ANRS CO-10 cohort, all patients are prospectively followed from birth.

Purpose: Efficient anti-retroviral treatments lead to a significantly increased life expectancy. Children with perinatal infection are now reaching adulthood. The deleterious impact of viral replication during ontogenesis of the immune system, and the high thymic activity during the early years of life, preclude an extrapolation from data pertaining to the adult immune status and mean that specific pediatric studies are required. No data are available concerning the immune status of adolescents or young adults infected via materno-foetal transmission. Detailed description: Our assumption is that the duration of uncontrolled viral replication will affect the immune status after treatment because viral replication is associated with: 1. disease progression independently of CD4+ T cell levels; 2. accelerated senescence of the immune system; 3. destruction of organs involved in the restoration of major immune cell populations. The aims of the study are: 1. to describe the immune and virological status of perinatally infected patients that are above 15 yrs old and 2. to study their associations with : 1. the current virological/clinical and therapeutic status, 2. the duration of uncontrolled viremia (defined by treatment history), 3. the virological, immunological (CD4+ numbers), and clinical status at time of HAART initiation. The immune status will be defined by (1) the number and phenotype of CD4+ and CD8+ T lymphocytes, dendritic cells, regulatory T cells, and NK cells, (2) the functions (proliferation and cytokine production) of CD4+ and CD8+ lymphocytes that are specific for HIV, a recall antigen (tetanus toxoid) and other viruses (CMV, EBV and Flu),the repertoire of Natural Killer cell receptors. The virological status will be defined by the level of HIV DNA in PBMCs, the HIV subtype, resistance mutations in archived and circulating virus and sequences of the regions of the viral envelope involved in co-receptor use. Clinical, therapeutic, demographic, virological and immunological data are collected from birth for members of the ANRS CO-10 cohort, and will be collected retrospectively since diagnosis for non-included patients.