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Concept
Interleukin
Summary
Interleukins (ILs) are a group of cytokines (secreted proteins and signal molecules) that are expressed and secreted by white blood cells (leukocytes) as well as some other body cells. The human genome encodes more than 50 interleukins and related proteins.
The function of the immune system primarily depends on interleukins, and rare deficiencies of a number of them have been described, all featuring autoimmune diseases or immune deficiency. The majority of interleukins are synthesized by CD4 helper T-lymphocytes, as well as through monocytes, macrophages, and endothelial cells. They promote the development and differentiation of T and B lymphocytes, and hematopoietic cells.
Interleukin receptors on astrocytes in the hippocampus are also known to be involved in the development of spatial memories in mice.
The name "interleukin" was chosen in 1979, to replace the various different names used by different research groups to designate interleukin 1 (lymphocyte activating factor, mitogenic protein, T-cell replacing factor III, B-cell activating factor, B-cell differentiation factor, and "Heidikine") and interleukin 2 (TSF, etc.). This decision was taken during the Second International Lymphokine Workshop in Switzerland (27-31 May 1979 in Ermatingen).
The term interleukin derives from (inter-) "as a means of communication", and (-leukin) "deriving from the fact that many of these proteins are produced by leukocytes and act on leukocytes". The name is something of a relic; it has since been found that interleukins are produced by a wide variety of body cells. The term was coined by Dr Vern Paetkau, University of Victoria.
Some interleukins are classified as lymphokines, lymphocyte-produced cytokines that mediate immune responses.
Interleukin 1
Interleukin 1 alpha and interleukin 1 beta (IL1 alpha and IL1 beta) are cytokines that participate in the regulation of immune responses, inflammatory reactions, and hematopoiesis.
Official source
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