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[19] [20] High expression of CD25 is also found on TCR activated conventional T cells (both CD8+ and CD4+ T lymphocytes), where it is considered to be a marker of T cell activation. [21] Additionally, expression of the IL-2 receptor alpha subunit can be found in non-lymphoid tissues such as lungs ( alveolar macrophages ), liver ( Kupffer cells ...
Originally, high expression of CD25 and CD4 surface markers was used (CD4 + CD25 + cells). This is problematic as CD25 is also expressed on non-regulatory T cells in the setting of immune activation such as during an immune response to a pathogen.
IL-2 binds to the IL-2 receptor, which has three forms, generated by different combinations of three different proteins, often referred to as "chains": α (alpha) (also called IL-2Rα, CD25, or Tac antigen), β (beta) (also called IL-2Rβ, or CD122), and γ (gamma) (also called IL-2Rγ, γ c, common gamma chain, or CD132); these subunits are also parts of receptors for other cytokines.
Markers of T cell activation include CD69, CD71 and CD25 (also a marker for Treg cells), and HLA-DR (a marker of human T cell activation). CTLA-4 expression is also up-regulated on activated T cells, which in turn outcompetes CD28 for binding to the B7 proteins. This is a checkpoint mechanism to prevent over activation of the T cell.
In turn, this results in the T cell acquiring an activated phenotype seen by the up-regulation of surface markers CD25 +, CD44 +, CD62L low, CD69 + and may further differentiate into a memory T cell. Having adequate numbers of naive T cells is essential for the immune system to continuously respond to unfamiliar pathogens.
The interleukin 2 receptor, which is involved in T cell-mediated immune responses, is present in 3 forms with respect to ability to bind interleukin 2.The low affinity form is a monomer of the alpha subunit (also called CD25) and is not involved in signal transduction.
16183 Ensembl ENSG00000109471 ENSMUSG00000027720 UniProt P60568 P04351 RefSeq (mRNA) NM_000586 NM_008366 RefSeq (protein) NP_000577 NP_032392 Location (UCSC) Chr 4: 122.45 – 122.46 Mb Chr 3: 37.17 – 37.18 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Interleukin-2 (IL-2) is an interleukin, which is a type of cytokine signaling molecule forming part of the immune system. It is a ...
Due to this realisation, a group of lineage negative cells (requirement of any true precursor cell), that were entirely dependent on the presence of ID2, and expressed other key ILC markers, were identified, with the phenotype: Lin-ID2+IL7Ra+CD25-α4β7+, which are now known as the common helper like innate lymphoid progenitors CHILPs. [28]