Dendritic cell antigen processing and presentation machinery (DC APPM) (DC APPM)

The dendritic cell antigen processing and presentation machinery (APPM) is a coordinated system of proteins and organelles responsible for converting proteins into immunogenic peptides and displaying them on Major Histocompatibility Complex (MHC) molecules (PubMed: 11244032). This machinery is essential for the initiation of adaptive immune responses, as it allows T-cells to recognize foreign or mutated antigens. Key components include the proteasome for cytosolic degradation, the Transporter associated with Antigen Processing (TAP) for peptide translocation, and various chaperones like tapasin that facilitate peptide loading onto MHC molecules (PubMed: 15926751). In oncology, tumors often downregulate these components to evade immune detection, a process known as immune editing (PubMed: 12117811). Therapeutic strategies include cancer vaccines and TLR agonists (e.g., Imiquimod) that enhance DC maturation and presentation efficiency (PubMed: 21422470). Additionally, proteasome inhibitors like Bortezomib can modulate the peptide repertoire, potentially exposing new epitopes for immune recognition (PubMed: 15128857).

Other names

Antigen processing and presentation pathwayMHC presentation machineryDC antigen processing pathwayMHC class I and II presentation pathways

Modulation of antigen degradation, transport, and loading onto MHC molecules to enhance or suppress T-cell mediated immunity.