Phosphoinositide 3-kinase signaling pathway components (PI3K pathway)

The PI3K-dependent signaling pathway is a critical intracellular signal transduction system that regulates diverse cellular processes including growth, proliferation, survival, and metabolism (Source: PubMed PMID: 29101370). It is activated by various cell surface receptors, such as receptor tyrosine kinases (RTKs) and G protein-coupled receptors (GPCRs), which trigger the recruitment and activation of Phosphoinositide 3-kinases (PI3Ks) (Source: StatPearls NBK557544). These enzymes generate phosphatidylinositol-3,4,5-trisphosphate (PIP3), which serves as a docking site for downstream effectors like AKT and mTOR (Source: UniProt P42336). Dysregulation of this pathway, often through mutations in PIK3CA or loss of the tumor suppressor PTEN, is a hallmark of many human cancers and contributes to insulin resistance in type 2 diabetes (Source: NIH NCI). Consequently, various components of this pathway are major targets for therapeutic intervention, with drugs like Alpelisib and Idelalisib approved for specific oncology indications (Source: FDA). However, therapeutic use is often limited by significant safety concerns, including hyperglycemia and immune-mediated toxicities, reflecting the pathway's essential role in normal physiology (Source: PubMed PMID: 31209229).

Other names

PI3K-dependent signaling componentsPI3K/AKT/mTOR pathwayPhosphatidylinositol 3-kinase signalingPI3K-AKT signaling cascadePI3K pathway

Inhibition of the catalytic activity of Phosphoinositide 3-kinase (PI3K) isoforms, AKT, or mTOR, thereby preventing the phosphorylation of downstream substrates and inhibiting cell cycle progression and survival (Source: PubMed PMID: 30635424).