Antigen-presenting cell-mediated activation of cytotoxic T cells

Antigen-presenting cell-mediated activation of cytotoxic T cells" refers to a cellular process, not a specific molecule or receptor. In this process, **antigen-presenting cells** (APCs)—such as dendritic cells, macrophages, and B cells—activate **cytotoxic T cells** (CD8+ T cells) through the presentation of peptide antigens bound to major histocompatibility complex class I (MHC I) molecules on their surface. Activation also requires costimulatory signals (such as B7 proteins/CD80/CD86 engaging CD28) and additional cytokine signaling to induce clonal expansion, differentiation, and cytotoxic function in T cells[1][2][3][4][5][7]. This dual-signal mechanism ensures specificity and limits inappropriate T cell activation, playing a central role in adaptive immunity, cancer immunotherapy, infection defense, and autoimmunity. **Key context:** - This query describes a critical immunological pathway, not a discrete molecular target. - For therapeutic intervention, druggable targets are typically individual molecules (e.g., CD80, CD86, CD28, CTLA-4, MHC I), not the full process itself[1][3][4][5][7]. - For structured curation, individual molecular components should be listed as targets (such as "CD8", "MHC class I", etc.), not the cellular process as a whole.