Multiple growth factor receptors (RTKs)

Multiple growth factor receptors refer to a diverse group of cell-surface proteins, primarily receptor tyrosine kinases (RTKs), that facilitate cellular communication by binding specific extracellular ligands (Source: NIH National Cancer Institute). This category includes critical therapeutic targets such as the Vascular Endothelial Growth Factor Receptor (VEGFR), Platelet-Derived Growth Factor Receptor (PDGFR), and Fibroblast Growth Factor Receptor (FGFR) (Source: StatPearls). These receptors play fundamental roles in regulating cell proliferation, survival, and the formation of new blood vessels, a process known as angiogenesis (Source: Nature Reviews Cancer). In many pathological states, particularly oncology, these receptors are frequently overexpressed or constitutively active due to genetic mutations, driving tumor growth and metastasis (Source: PubMed, PMID: 18301331). Pharmacological intervention typically involves multi-kinase inhibitors (MKIs) that bind to the intracellular ATP-binding pocket of these receptors to block downstream signaling cascades like the MAPK and PI3K pathways (Source: Journal of Clinical Oncology). While effective in treating various solid tumors and fibrotic conditions, the simultaneous inhibition of multiple growth factor pathways often results in a distinct profile of systemic toxicities, including hypertension and dermatological reactions (Source: PMC, PMC3136831).

Other names

Receptor tyrosine kinasesGrowth factor receptor familyMulti-kinase targetsRTK family

Multi-kinase inhibitors target multiple growth factor receptors by competitively binding to the adenosine triphosphate (ATP) binding site within the intracellular tyrosine kinase domain. This binding prevents the autophosphorylation of tyrosine residues, which is essential for the recruitment of downstream signaling proteins. Consequently, major intracellular pathways such as the Ras/Raf/MEK/ERK (MAPK) pathway and the PI3K/Akt/mTOR pathway are inhibited, leading to reduced cell proliferation, increased apoptosis, and the suppression of tumor-induced angiogenesis (Source: StatPearls; PubMed, PMID: 24501019).