Dendritic cell antigen processing and presentation machinery (DC APM)

The dendritic cell antigen processing and presentation machinery (APM) is a complex, multi-step biological system responsible for the degradation of proteins into antigenic peptides and their subsequent loading onto Major Histocompatibility Complex (MHC) molecules [1, 2]. This machinery is fundamental to the initiation of adaptive immune responses, as it allows dendritic cells to present "non-self" signals to T-cell receptors [2]. Key molecular components include the proteasome, the Transporter associated with Antigen Processing (TAP1/2), and various endoplasmic reticulum-resident chaperones such as tapasin [3]. In oncology, tumors often downregulate components of this machinery to evade detection by the immune system, a process known as immune escape [3]. Therapeutic strategies targeting this system include the use of TLR agonists to mature dendritic cells and vaccines designed to deliver antigens directly into this processing pathway to stimulate anti-tumor T-cell activity [4]. [1] Blum JS, et al. Annu Rev Immunol. 2013;31:443-73. [2] Janeway CA Jr, et al. Immunobiology. 5th ed. 2001. [3] Leone P, et al. J Natl Cancer Inst. 2013;105(16):1172-87. [4] Sabado RL, et al. Cell Res. 2017;27(1):74-95.

Other names

Antigen processing and presentation pathwayMHC class I and II presentation machineryDC-APMAntigen processing machinery

Modulation of the proteolytic cleavage of proteins and the subsequent loading of resulting peptides onto MHC molecules for recognition by T-cell receptors.