References
DENDRITIC_CELL
CASCADE:MCR1
CASCADE:INTEGRIN_AVB3
CASCADE:INTEGRIN_AVB5
CASCADE:CD36
PMID:9510252
Dendritic cells acquire antigen from apoptotic cells and induce class I-restricted CTLs
PMID:17948027, PMID:22437871, PMID:17204652
Dendritic Cells are critical Antigen-Presenting Cells in
tumor Immunity. They present processed protein and lipid
antigens to T cells via both classical (major histocompatibility
complex (MHC) class I and class II) and non-classical (CD1
family) antigen-presenting molecules.
PMID:22790179, PMID:14508489
The presentation of exogenous antigens on MHC class I molecules, known as cross-presentation, is essential for the initiation of CD8+ T cell responses. In vivo, cross-presentation is mainly carried out by specific dendritic cell (DC) subsets through an adaptation of their endocytic and phagocytic pathways.
After phagocytosis, antigens are exported into the cytosol and degraded by the proteasome4, 5, 6. The resulting peptides are thought to be translocated into the lumen of the endoplasmic reticulum (ER) by specific transporters associated with antigen presentation (TAP), and loaded onto MHC class I molecules by a complex ???loading machinery??? (which includes tapasin, calreticulin and Erp57).
Additionally, after antigen export to the cytosol and degradation by the proteasome, peptides are translocated by TAP into the lumen of the same phagosomes, before loading on phagosomal MHC class I molecules.
PMID:10837075
Immature DCs are very efficient in Ag capture and can use several pathways, such as (a) macropinocytosis; (b) receptor-mediated endocytosis via C-type lectin receptors (mannose receptor, DEC-205)
or Fc?? receptor types I (CD64) and II (CD32) [uptake of immune complexes or opsonized particles ]; and (c) phagocytosis of particles such as latex beads , apoptotic and necrotic cell fragments (involving CD36 and ??v??3 or ??v??5 integrins), viruses, and bacteria including mycobacteria, as well as intracellular parasites such as Leishmania major. DCs can also internalize the peptide loaded heat shock proteins gp96 and Hsp70 through presently unknown mechanisms
References
in_re1( Innate Immunity ):
PMID:10837075
Immature DCs are very efficient in Ag capture and can use several pathways, such as (a) macropinocytosis; (b) receptor-mediated endocytosis via C-type lectin receptors (mannose receptor, DEC-205)
or Fc?? receptor types I (CD64) and II (CD32) [uptake of immune complexes or opsonized particles ]; and (c) phagocytosis of particles such as latex beads , apoptotic and necrotic cell fragments (involving CD36 and ??v??3 or ??v??5 integrins), viruses, and bacteria including mycobacteria, as well as intracellular parasites such as Leishmania major. DCs can also internalize the peptide loaded heat shock proteins gp96 and Hsp70 through presently unknown mechanisms
in_re34( Innate Immunity ):
PMID:22790179, PMID:14508489
The presentation of exogenous antigens on MHC class I molecules, known as cross-presentation, is essential for the initiation of CD8+ T cell responses. In vivo, cross-presentation is mainly carried out by specific dendritic cell (DC) subsets through an adaptation of their endocytic and phagocytic pathways.
After phagocytosis, antigens are exported into the cytosol and degraded by the proteasome4, 5, 6. The resulting peptides are thought to be translocated into the lumen of the endoplasmic reticulum (ER) by specific transporters associated with antigen presentation (TAP), and loaded onto MHC class I molecules by a complex ???loading machinery??? (which includes tapasin, calreticulin and Erp57)
References
in_re1( Innate Immunity ):
PMID:10837075
Immature DCs are very efficient in Ag capture and can use several pathways, such as (a) macropinocytosis; (b) receptor-mediated endocytosis via C-type lectin receptors (mannose receptor, DEC-205)
or Fc?? receptor types I (CD64) and II (CD32) [uptake of immune complexes or opsonized particles ]; and (c) phagocytosis of particles such as latex beads , apoptotic and necrotic cell fragments (involving CD36 and ??v??3 or ??v??5 integrins), viruses, and bacteria including mycobacteria, as well as intracellular parasites such as Leishmania major. DCs can also internalize the peptide loaded heat shock proteins gp96 and Hsp70 through presently unknown mechanisms
References
in_re34( Innate Immunity ):
PMID:22790179, PMID:14508489
The presentation of exogenous antigens on MHC class I molecules, known as cross-presentation, is essential for the initiation of CD8+ T cell responses. In vivo, cross-presentation is mainly carried out by specific dendritic cell (DC) subsets through an adaptation of their endocytic and phagocytic pathways.
After phagocytosis, antigens are exported into the cytosol and degraded by the proteasome4, 5, 6. The resulting peptides are thought to be translocated into the lumen of the endoplasmic reticulum (ER) by specific transporters associated with antigen presentation (TAP), and loaded onto MHC class I molecules by a complex ???loading machinery??? (which includes tapasin, calreticulin and Erp57)
→ Tumor_antigen@PHAGOSOME/ENDOSOME/LYSOSOME_Membrane
→ Tumor_antigen_fragment@PHAGOSOME/ENDOSOME/LYSOSOME_Membrane
→ Tumor_antigen@INNATE_IMMUNE_CELL_Cytosol
→ Tumor_antigen_fragment@INNATE_IMMUNE_CELL_Cytosol