Immune system – antigen recognition

Immune system – antigen recognition is a broad biological process essential for the adaptive and innate immune responses, involving the detection of specific molecular patterns or epitopes by specialized receptors [Cambridge University Press, 1.1.1; OmicsOnline, 1.1.4]. In the adaptive immune system, this is primarily mediated by T-cell receptors (TCRs) and B-cell receptors (BCRs), which recognize antigens presented by Major Histocompatibility Complex (MHC) molecules or in their native form, respectively [Cambridge University Press, 1.1.1; Google Patents, 1.1.2]. The innate immune system utilizes pattern recognition receptors (PRRs) to identify conserved microbial structures [Theranostics, 1.2.3]. This recognition event is the primary trigger for immune activation, leading to cell proliferation, cytokine release, and targeted destruction of pathogens or abnormal cells [Cambridge University Press, 1.1.1; MDPI, 1.2.1]. Dysregulation of antigen recognition is a hallmark of many diseases; for instance, cancer cells often downregulate MHC or upregulate inhibitory ligands to evade recognition, while autoimmune diseases arise from the inappropriate recognition of self-antigens [MDPI, 1.2.1; Frontiers in Immunology, 1.2.2; EurekAlert, 1.2.4]. Therapeutic strategies targeting this process include immune checkpoint inhibitors that restore recognition of tumor cells and immunosuppressants that block recognition-induced signaling to treat autoimmunity and prevent transplant rejection [MDPI, 1.2.1; Theranostics, 1.2.3].

Other names

Antigen recognitionImmune recognitionAdaptive immune recognitionInnate immune recognitionAntigen-receptor interaction

Modulation of antigen recognition and subsequent immune activation through checkpoint inhibition (e.g., PD-1/CTLA-4 blockade), direct receptor targeting (e.g., anti-CD3), or interference with costimulatory signaling pathways.