PIP3 Antagonist II, DM-PIT-1

Toxicity: Regulatory Review (Z)

A cell-permeable benzoylthiourea compound that is shown to compete against PIP3 for binding PH (pleckstrin-homology) domains of Akt1 (IC₅₀ ≥31 µM using recombinant human Akt1 aa 1-123), ARNO, GRP1, and PKD1, while lacking activity against PIP3 Btk PH domain ineraction, PI-4,5-P2 (Cat. Nos. 524644) PLC-δ PH domain binding, or PI-3,4-P2 TAPP1/2 PH domains binding, resulting in effective blockage of PIP3-dependent PI3K-PDK1-Akt signaling pathway activation in human glioblastoma U87MG cultures (25 to 100 µM for 3 d) and (5 min 100 ng/ml) PDGF-induced Akt and GRP membrane translocation (by 85% and 70%, respectively, with 1 h 100 µM pretreatment) in serum-starved human breast cancer SUM159 cells, while being inactive against PDGF-induced Btk translocation or (5 min 250 ng/ml) PMA-induced PLC-δ and TAPP1/2 translocations. Although DM-PIT-1 can be administered as a DMSO stock for effective culture treatments, incorporating DM-PIT-1 into PEG-PE mixed micelles is reported to enhance its solubility (up to 1 mM), and presumably delivery efficiency (57% vs. 67% U87MG viability after 24 h 50 µM drug treatment, respectively, with or without PEG-PE encapsulation), making large dosage delivery possible for more effective in vivo administrations (5% vs. 41% of control 4T1 tumor size in mice after 8 daily i.v. dosages of 1 mg/kg micelles-formulated or 0.4 mg/kg free drug, respectively).

Miao, B., et al. 2010. Proc. Natl. Acad. Sci. USA107, 20126.
Skidan, I., et al. 2009. Drug Deliv.16, 45.

Packaged under inert gas

Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 6 months at -20°C.

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