Phosphoinositide 3-kinase–Akt–mammalian target of rapamycin complex 1 signaling pathway (PI3K–Akt–mTORC1 pathway)

The phosphoinositide 3-kinase–Akt–mammalian target of rapamycin complex 1 (PI3K–Akt–mTORC1) signaling pathway is a highly conserved intracellular signal transduction cascade activated by various growth factors, hormones, and cytokines. It coordinates nutrient sensing, growth factor signaling, and metabolic regulation to promote cell growth, proliferation, survival, and metabolism. The pathway is commonly overactive in cancer and other proliferative disorders, making it a key therapeutic target. While blockade of individual nodes (such as PI3K, Akt, or mTOR) is already being utilized in the clinic, the pathway’s crosstalk with metabolic and apoptotic machinery, and its role in normal homeostasis, present challenges for precision therapy. This entry describes a signaling pathway, not a singular molecule or receptor, and as such it is an "incorrect" entry for a field requiring a specific molecular target, such as a single protein, receptor, or enzyme. For structured therapeutic purposes, the correct targets would be defined as "Phosphoinositide 3-kinase (PI3K)", "Protein kinase B (Akt)", or "Mammalian target of rapamycin complex 1 (mTORC1)" individually.

Other names

PI3K–Akt–mTOR pathwayPI3K/Akt/mTOR pathwayPI3K–PKB–mTOR pathwayPhosphatidylinositol 3-kinase–Akt–mTOR pathway

Inhibition of kinase activity (blocking PI3K, AKT, or mTORC1); Downregulation of pathway activation to reduce cell proliferation and promote apoptosis; Blocking metabolic reprogramming of cancer cells