Luminespib (NVP-AUY922)

465, 54

Female NCr athymic mice bearing WM266.4 human melanoma xenografts

1 uM

In DMSO and diluted in sterile saline/Tween 20

NVP-AUY922 inhibits proliferation of various human cancer cell lines in vitro, with an average GI50 of 9 nM. [1] The IC50 values of NVP-AUY922 fall in the range of 2 to 40 nM in these gastric cancer cell lines. IC50 value for the BEAS-2B cells is 28.49 nM. Treatment with NVP-AUY922 does not influence the expression of HSP90, but expression of HSP70 gets elevated by NVP-AUY922 treatment. NVP-AUY922 increases the binding of HSP70 to HSP90. NVP-AUY922 causes p23 dissociation from the HSP90 complex and can then recruit HSP70 to the HSP90 complex. [1] After the treatment with NVP-AUY922, expression of receptor tyrosine kinases including VEGFR1, 2, 3 and PDGFR is decreased. A decrease is also noticed in the expression of Akt and phospho-Akt. Meanwhile, treatment with NVP-AUY922 causes decreased expression of HER-2 in NCI-N87 cells. NVP-AUY922 treatment results in binding of HSP90 to client proteins and setting them up as targets for degradation by the proteasome. NVP-AUY922 can influence cell growth by affecting mutiple signaling pathways. In addition, treatment with the proteasome inhibitor, MG132, restores expression of thymidylate synthase, which is decreased by NVP-AUY922. NVP-AUY922 increases the expression of cleaved caspase-3 leading to apoptosis in HSC-2 cells.[1]

3 days

Human gastric cancer cells NCI-N87 (5-7 x103 in 50 uL/well) are seeded in 96-well plates and incubated at 37 C for 24 hours, followed by NVP-AUY922 treatment for 1-3 days at 37 C. After treatment, the cells are assayed by MTT method and analyzed by microplate reader.

Luminespib (AUY-922, NVP-AUY922, VER-52296) is a highly potent HSP90 inhibitor for HSP90α/β with IC50 of 13 nM /21 nM in cell-free assays, weaker potency against the HSP90 family members GRP94 and TRAP-1, exhibits the tightest binding of any small-molecule HSP90 ligand. Luminespib (AUY-922, NVP-AUY922) effectively downregulates and destabilizes the IGF-1Rβ protein and results in growth inhibition, autophagy and apoptosis. Phase 2.