Physiologic growth factor and cytokine receptors

Physiologic growth factor and cytokine receptors represent a broad class of transmembrane proteins that serve as primary conduits for extracellular signals governing cell growth, survival, and immune function. These receptors are typically classified into families based on their structural motifs and signaling mechanisms, such as receptor tyrosine kinases (RTKs) for growth factors like EGF and PDGF, or the various cytokine receptor families that signal through associated Janus kinases (JAKs) (Klaassen, C. D., Casarett & Doull's Toxicology, 2013; Lemmon & Schlessinger, Cell, 2010). Upon ligand binding, these receptors undergo conformational changes or dimerization that activate intracellular signaling pathways, including the MAPK/ERK, PI3K/Akt, and JAK/STAT pathways (O'Shea et al., Nature Reviews Drug Discovery, 2013). Dysregulation of these receptors—through overexpression, mutation, or autocrine signaling loops—is a central driver in the pathogenesis of many cancers and chronic inflammatory conditions. Consequently, they are major targets for therapeutic intervention, with drugs designed to either block the extracellular binding site or inhibit the intracellular enzymatic activity to restore normal cellular signaling (DrugBank Online, 2024).

Other names

Growth factor receptorsCytokine receptorsCell surface signaling receptorsTransmembrane signaling receptors

Drugs targeting these receptors typically act through monoclonal antibody-mediated blockade of the extracellular ligand-binding domain, inhibition of receptor dimerization, or small-molecule inhibition of the intracellular tyrosine kinase or Janus kinase domains to prevent downstream signal transduction (Lemmon & Schlessinger, Cell, 2010; O'Shea et al., Nature Reviews Drug Discovery, 2013).