PI3K-AKT-Hsp90 signaling axis (PI3K/AKT/Hsp90 pathway)

The “PI3K/AKT/Hsp90 pathway” describes the *interactive network* of PI3K (a lipid kinase initiating signal transduction following growth factor receptor stimulation), AKT (a central serine/threonine kinase regulating cell growth and survival), and Hsp90 (a molecular chaperone essential for stabilizing many signaling proteins including PI3K and AKT). Hsp90 maintains the integrity and expression of active signaling components, and its inhibition destabilizes multiple pathways necessary for cancer cell survival. All three have been independently and synergistically targeted in cancer therapy, with combination approaches showing promise in overcoming drug resistance, although care must be taken due to toxicity and broad cellular roles. This axis is implicated in multiple cancers, and its deregulation is a key driver of tumor growth, metastasis, and chemotherapy resistance. Not a single molecule; refers to a functional axis. Should generally be broken down as distinct targets: Phosphoinositide 3-kinase (PI3K), Protein kinase B (AKT), Heat shock protein 90 (Hsp90). Useful for structured modeling only as a pathway for therapeutic intervention, not as a distinct molecular target.

Other names

PI3K pathwayAKT pathwayHsp90 signalingPI3K-AKT-Hsp90 axisPI3K-AKT-mTOR pathway

PI3K inhibition: blocks lipid phosphorylation, halting downstream signal (prevents cell proliferation) AKT inhibition: prevents cell survival, increases apoptosis Hsp90 inhibition: destabilizes client proteins, leads to degradation of oncogenic signaling molecules (including PI3K, AKT, mTOR) Dual pathway inhibition: synergistically induces tumor cell death, overcomes feedback resistance