Preferred Label : T-Cell Polarization Pathway;
NCIt related terms : Selective expression of chemokine receptors during T-cell polarization;
Alternative definition : BIOCARTA: Chemokine receptors expressed by T helper cells help recruit cells to specific
locations based on their chemoattractant ligands. The polarization of T cells into
Th1 and Th2 cells is associated with their expression of different subsets of chemokine
receptors. Naive CD4 positive cells that have not been exposed to antigen express
CXCR4 and CCR7. The most abundant chemokine receptors on Th1 cells involved in the
cellular immune response to microbial agents include CXCR3, CCR1, CCR2 and CCR5, while
Th2 cells express CCR2, CCR3 and CCR5. An additional class of T cells termed semi-naive
cells may be induced by TGF-beta to express yet another class of chemokine receptors,
CCR4 and CCR7. Although the expression of chemokine receptors in different cells is
preferred in these cases, it is not absolute or exclusive, and there is overlap in
expression between Th1 and Th2 cells. Although CCR7 positive cells have been reported
to lack effector action, not be polarized, and to home only to lymphoid tissues, other
studies have found CCR7 positive Th1 and Th2 cells and have identified CCR7 positive
cells in non-lymphoid tissues. CCR4 appears associated with homing of lymphocytes
to the skin, and CCR9 is associated with homing to the small intestine, while other
chemokines like CXCR3 and CCR5 are associated with homing toward inflamed tissues
more broadly. The expression of different chemokine receptors by subsets of T helper
cells plays an important role in the migration and homing of these cells in tissues,
and targeting of the immune response to specific cells. (This definition may be outdated
- see the DesignNote.);
NCIt note : The BIOCARTA Definition (ALT_DEFINITION) for this pathway concept was provided by
BioCarta. This property was not created by, nor is it maintained by the NCI Thesaurus
staff. Additionally, BioCarta is no longer updating its pathway data; thus, the BIOCARTA
Definition might be outdated or inaccurate. Please see the Terms and Conditions for
Use at http://www.biocarta.com/.;
Biocarta ID : h_nktPathway;
Origin ID : C39166;
UMLS CUI : C1515130;
Semantic type(s)
has_gene_product_element
pathway_has_gene_element