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Concept
Cytokine receptor
Résumé
Cytokine receptors are receptors that bind to cytokines.
In recent years, the cytokine receptors have come to demand the attention of more investigators than cytokines themselves, partly because of their remarkable characteristics, and partly because a deficiency of cytokine receptors has now been directly linked to certain debilitating immunodeficiency states. In this regard, and also because the redundancy and pleiotropy of cytokines are a consequence of their homologous receptors, many authorities are now of the opinion that a classification of cytokine receptors would be more clinically and experimentally useful.
A classification of cytokine receptors based on their three-dimensional structure has been attempted. (Such a classification, though seemingly cumbersome, provides several unique perspectives for attractive pharmacotherapeutic targets.)
Type I cytokine receptors, whose members have certain conserved motifs in their extracellular amino-acid domain. The IL-2 receptor belongs to this chain, whose γ-chain (common to several other cytokines) deficiency is directly responsible for the x-linked form of Severe Combined Immunodeficiency (X-SCID).
Type II cytokine receptors, whose members are receptors mainly for interferons.
Immunoglobulin (Ig) superfamily, which are ubiquitously present throughout several cells and tissues of the vertebrate body
Tumor necrosis factor receptor family, whose members share a cysteine-rich common extracellular binding domain, and includes several other non-cytokine ligands like receptors, CD40, CD27 and CD30, besides the ligands on which the family is named (TNF).
Chemokine receptors, two of which acting as binding proteins for HIV (CXCR4 and CCR5). They are G protein coupled receptors.
TGF-beta receptor family, which are Serine/threonine kinase receptors. Includes the TGF beta receptors
Cytokine receptors may be both membrane-bound and soluble. Soluble cytokine receptors are extremely common regulators of cytokine function. Soluble cytokine receptors typically consist of the extracellular portions of membrane-bound receptors.
Source officielle
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Concepts associés (5)
Common gamma chain
The common gamma chain (γc) (or CD132), also known as interleukin-2 receptor subunit gamma or IL-2RG, is a cytokine receptor sub-unit that is common to the receptor complexes for at least six different interleukin receptors: IL-2, IL-4, IL-7, IL-9, IL-15 and interleukin-21 receptor. The γc glycoprotein is a member of the type I cytokine receptor family expressed on most lymphocyte (white blood cell) populations, and its gene is found on the X-chromosome of mammals.
Superfamille des immunoglobulines
vignette|Structure de l'immunoglobuline A (Ig A). La superfamille des immunoglobulines (IgSF) est une super-famille de protéines ayant en commun une structure tertiaire caractéristique des immunoglobulines. La structure de ces protéines contient un ou plusieurs domaines dits « de type immunoglobuline » (domaines Ig). Ces protéines sont impliquées dans les phénomènes d'interaction cellule-cellule et cellule-matrice extracellulaire.
Déficit immunitaire combiné sévère
Le déficit immunitaire combiné sévère (DICS) est un syndrome caractérisant un groupe de maladies héréditaires rares caractérisées par une anomalie des lymphocytes T et B. Ces maladies peuvent présenter une diversité de symptômes cliniques. Les DICS provoquent une défaillance de la production d'anticorps, un mécanisme de la réponse immunitaire, en affectant soit directement les lymphocytes B, soit en perturbant leur activation via des lymphocytes T auxiliaires non-fonctionnels.