Multiple T-cell surface antigens

Multiple T-cell surface antigens encompass a broad spectrum of proteins expressed on T-lymphocytes, including CD2, CD3, CD4, CD8, CD11a, CD18, CD25, CD44, CD45, and HLA molecules (StatPearls, 2023; Mohty, 2007). These antigens are essential for various immunological processes such as T-cell activation, signal transduction, and leukocyte adhesion (Mohty, 2007). In therapeutic settings, these antigens serve as the collective target for rabbit antithymocyte globulin (rATG), a polyclonal antibody preparation (StatPearls, 2023). Binding of rATG to these surface markers leads to rapid T-cell depletion via complement-dependent cytotoxicity, antibody-dependent cell-mediated cytotoxicity, and apoptosis (Popow et al., 2013). Additionally, the interaction modulates the expression of adhesion molecules and chemokine receptors, interfering with T-cell trafficking and function (Mohty, 2007). This multi-target approach is clinically utilized to prevent and treat acute rejection in solid organ transplantation and to manage graft-versus-host disease in bone marrow transplant recipients (StatPearls, 2023; DrugBank, 2024). The broad immunosuppressive effect is also leveraged in the treatment of severe aplastic anemia (StatPearls, 2023).

Other names

Thymocyte antigensT-lymphocyte surface antigensrATG targetsT-cell receptors and adhesion molecules

Rabbit antithymocyte globulin induces immunosuppression by binding to multiple T-cell surface antigens, causing rapid T-cell depletion through complement-mediated lysis, opsonization, and apoptosis (StatPearls, 2023; Popow et al., 2013). It also modulates immune responses by blocking adhesion molecules and inducing regulatory T-cells (Mohty, 2007).