PIK-III, also known as VPS34-IN2, is a VPS34 inhibitor which blocks autophagy and uncovers a role for NCOA4 in ferritin degradation and iron homeostasis in vivo. PIK-III binds a unique hydrophobic pocket not present in related kinases such as PI(3)Kα. PIK-III acutely inhibits autophagy and de novo lipidation of LC3, and leads to the stabilization of autophagy substrates. .
CAS Number: 1383716-40-2
Molecular Weight: 319.36
Chemical Name: 4'-(cyclopropylmethyl)-N2-(pyridin-4-yl)-[4,5'-bipyrimidine]-2,2'-diamine
Appearance: Solid Power
Purity: ≥98% (or refer to the Certificate of Analysis)
Solubility: Soluble in DMSO
Shipping Condition: Shipped under ambient temperature as non-hazardous chemical or refer to Certificate of Analysis
Storage Condition: Dry, dark and -20 oC for 1 year or refer to the Certificate of Analysis.
Shelf Life: ≥12 months if stored properly.
Stock Solution Storage: 0 - 4 oC for 1 month or refer to the Certificate of Analysis.
Drug Formulation: To be determined.
HS Tariff Code: 382200
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PIK-III is a selective inhibitor of VPS34 that binds a unique hydrophobic pocket not present in related kinases such as PI3Kα. PIK-III is at least 100-fold-selective for VPS34 over related lipid kinases such as PI3K and the protein kinase mTOR. PIK-III acutely inhibits autophagy and de novo lipidation of LC3, and leads to the stabilization of autophagy substrates. In H4 cells expressing the mCherry-GFP-LC3 reporter PIK-III inhibits the formation of mCherry-positive autolysosomes and increases the cytosolic signal of LC3 under basal conditions and when autophagy is induced with the mTOR inhibitor AZD8055. PIK-III prevents the turnover of GFP-tagged p62 under basal conditions and when autophagy is activated. PIK-III treatment leads to an increase in the levels of LC3-I in H4 and PSN1 cells.
The DFX-induced NCOA4-dependent turnover of FTH1 and FTL is blocked with PIK-III suggesting an autophagy-dependent process.
- Dowdle WE et al. Selective VPS34 inhibitor blocks autophagy and uncovers a role for NCOA4 in ferritin degradation and iron homeostasis in vivo. Nat Cell Biol. 2014 Nov;16(11):1069-79.
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