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The interleukin-2 receptor alpha chain (also called Tac antigen, P55, and mainly CD25) is a protein involved in the assembly of the high-affinity interleukin-2 receptor, consisting of alpha (IL2RA), beta and the common gamma chain ().
Thomas A. Waldmann was born in New York City as the only child of Elisabeth Sipos and Charles Waldmann. He received his M.D. from Harvard Medical School in 1955. He joined the National Cancer Institute in 1956 and became chief of the Lymphoid Malignancies Branch (formerly Metabolism Branch) in 1973.
CD25 deficiency or interleukin 2 receptor alpha deficiency is an immunodeficiency disorder associated with mutations in the interleukin 2 receptor alpha (CD25) (IL2RA) gene. The mutations cause expression of a defective α chain or complete absence thereof, an essential part of high-affinity interleukin-2 (IL-2) receptors.
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.
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All T cells derive from progenitor cells in the bone marrow, which become committed to their lineage in the thymus.All T cells begin as CD4-CD8-TCR- cells at the DN (double-negative) stage, where an individual cell will rearrange its T cell receptor genes to form a unique, functional molecule, which they, in turn, test against cells in the thymic cortex for a minimal level of interaction with ...
PDL2 or PDCD1LG2 (Programmed Cell Death 1 Ligand 2); on Dendritic cells, Macrophages etc. Ligand for PD-1 (CD279) CD274: PDL1 or PDCD1L1 (Programmed Cell Death 1 Ligand 1); expressed on T cells, NK cells, macrophages, myeloid DCs, B cells, epithelial cells, and vascular endothelial cells and others. Ligand for PD1 (CD279) and also CD80 (B7-1).