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Activators & Inhibitors
Chemical Modulators

PX-866 #13055

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PX-866: Image 1

Western blot analysis of extracts from Jurkat cells, untreated (-) or treated with PX-866 (1 μM; +) or Wortmannin #9951 (1 μM; +) for the indicated times, using Phospho-Akt (Ser473) (D9E) XP® Rabbit mAb #4060 (upper) and Akt (pan) (C67E7) Rabbit mAb #4691 (lower).

Product Usage Information

PX-866 is supplied as a lyophilized powder. For a 10mM stock, reconstitute the 1 mg in 190.26 μl DMSO. Working concentrations and length of treatment can vary depending on the desired effect, but it is typically used at 10 nM-1000 nM for 1-24 hours.


Store lyophilized or in solution at -20ºC, desiccated. In lyophilized form, the chemical is stable for 24 months. Once in solution, use within 3 months to prevent loss of potency. Aliquot to avoid multiple freeze/thaw cycles.

Product Description




Solubility: Soluble in DMSO and ethanol at 200 mg/ml. Very poorly soluble in water.

Molecular Formula


CAS 502632-66-8
Solubility Soluble in DMSO and EtOH at 200mg/ml.


PX-866 is a potent derivative of wortmannin that irreversibly inhibits PI3 kinase (1). Research studies demonstrate that PX-866 elicits a more sustained inhibition of PI3K than wortmannin. While both chemicals inhibit Akt phosphorylation similarly at short time periods (1-2 hr), PX-866 also demonstrates inhibitory effects for extended time periods (24 hr) at lower doses than wortmannin. This difference may be attributed to wortmannin’s short half-life of 10 minutes and the reduced cytotoxicity of PX-866 (2). PX-866 inhibits the PI3K pathway through down regulation of cyclin D1 protein, which is responsible for regulating cell cycle progression and autophagy induction (3). Additional research shows that PX-866 inhibits cell migration in cancer cell lines (2).

  1. Ihle, N.T. et al. (2004) Mol Cancer Ther 3, 763-72.
  2. Howes, A.L. et al. (2007) Mol Cancer Ther 6, 2505-14.
  3. Koul, D. et al. (2010) Neuro Oncol 12, 559-69.

Limited Uses

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Products are labeled with For Research Use Only or a similar labeling statement and have not been approved, cleared, or licensed by the FDA or other regulatory foreign or domestic entity, for any purpose. Customer shall not use any Product for any diagnostic or therapeutic purpose, or otherwise in any manner that conflicts with its labeling statement. Products sold or licensed by CST are provided for Customer as the end-user and solely for research and development uses. Any use of Product for diagnostic, prophylactic or therapeutic purposes, or any purchase of Product for resale (alone or as a component) or other commercial purpose, requires a separate license from CST. Customer shall (a) not sell, license, loan, donate or otherwise transfer or make available any Product to any third party, whether alone or in combination with other materials, or use the Products to manufacture any commercial products, (b) not copy, modify, reverse engineer, decompile, disassemble or otherwise attempt to discover the underlying structure or technology of the Products, or use the Products for the purpose of developing any products or services that would compete with CST's products or services, (c) not alter or remove from the Products any trademarks, trade names, logos, patent or copyright notices or markings, (d) use the Products solely in accordance with CST's Product Terms of Sale and any applicable documentation, and (e) comply with any license, terms of service or similar agreement with respect to any third party products or services used by Customer in connection with the Products.

For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
XP is a registered trademark of Cell Signaling Technology, Inc.
To Purchase # 13055S
Product # Size Price
1 mg $ 77