Preferred Label : Allograft Rejection Pathway;
NCIt related terms : Allograft rejection;
Alternative definition : KEGG: After transplantation of organ allografts, there are two pathways of antigen
presentation. In the direct pathway, recipient T cells react to intact allogeneic
MHC molecules expressed on the surface of donor cells. This pathway would activate
host CD4 or CD8 T cells. In contrast, donor MHC molecules (and all other proteins)
shed from the graft can be taken up by host APCs and presented to recipient T cells
in the context of self-MHC molecules - the indirect pathway. Such presentation activates
predominantly CD4 T cells. A direct cytotoxic T-cell attack on graft cells can be
made only by T cells that recognize the graft MHC molecules directly. Nontheless,
T cells with indirect allospecificity can contribute to graft rejection by activating
macrophages, which cause tissue injury and fibrosis, and are also likely to be important
in the development of an alloantibody response to graft.;
KEGG ID : hsa05330;
Origin ID : C91452;
UMLS CUI : C2984265;
Semantic type(s)
has_gene_product_element
pathway_has_gene_element