Virus-specific memory T cell (VST) (VST)

Virus-specific memory T cells (VSTs) are a specialized population of lymphocytes that provide long-term, antigen-specific immunity against viral pathogens. These cells are characterized by their ability to persist in a quiescent state and rapidly reactivate upon re-encountering viral peptides presented by Major Histocompatibility Complex (MHC) molecules (PubMed: 31534250). In the context of therapeutic intervention, they are primarily used in adoptive cell therapy (ACT) to restore viral immunity in immunocompromised patients, such as those undergoing hematopoietic stem cell transplantation (NIH: ClinicalTrials.gov). These cells function by recognizing infected host cells and inducing apoptosis through the release of perforin and granzymes, as well as secreting antiviral cytokines like interferon-gamma (StatPearls: T-Cell Mediated Immunity). Therapeutic strategies involve the infusion of donor-derived or autologous ex vivo expanded T cells, such as Tabelecleucel for EBV-associated diseases (EMA: Ebvallo Summary). Challenges in this field include ensuring the persistence of the transferred cells and avoiding graft-versus-host disease in allogeneic settings (Journal of Clinical Investigation, 2019).

Other names

Virus-specific T cellAntigen-specific memory T cellViral-specific cytotoxic T lymphocyteMemory T-lymphocyteVSTs

Adoptive transfer of virus-specific memory T cells provides immediate, long-term cellular immunity by recognizing and eliminating virus-infected cells through MHC-restricted TCR binding and subsequent release of cytotoxic granules (perforin/granzyme) and pro-inflammatory cytokines (PubMed: 31534250).