Potent dual inhibitors of TORC1 and TORC2 complexes (KU-0063794 and KU-0068650) demonstrate in vitro and ex vivo anti-keloid scar activity.

Abstract

Mammalian target of rapamycin (mTOR) is essential in controlling several cellular functions. This pathway is dysregulated in keloid disease (KD). KD is a common fibroproliferative dermal lesion with an ill-defined treatment strategy. KD demonstrates excessive matrix deposition, angiogenesis, and inflammatory cell infiltration. In KD, both total and phosphorylated forms of mTOR and p70(S6K)(Thr421/Ser424) are upregulated. Therefore, the aim of this study was to investigate adenosine triphosphate-competitive inhibitors of mTOR kinase previously unreported in keloid and their comparative efficacy with Rapamycin. Here, we present two mTOR kinase inhibitors, KU-0063794 and KU-0068650, that target both mTORC1 and mTORC2 signaling. Treatment with either KU-0063794 or KU-0068650 resulted in complete suppression of Akt, mTORC1, and mTORC2, and inhibition of keloid cell spreading, proliferation, migration, and invasive properties at a very low concentration (2.5 μmol  l(-1)). Both KU-0063794 and KU-0068650 significantly (P<0.05) inhibited cell cycle regulation and HIF1-α expression compared with that achieved with Rapamycin alone. In addition, both compounds induced shrinkage and growth arrest in KD, associated with the inhibition of angiogenesis, induction of apoptosis, and reduction in keloid phenotype-associated markers. In contrast, Rapamycin induced minimal antitumor activity. In conclusion, potent dual mTORC1 and mTORC2 inhibitors display therapeutic potential for the treatment of KD.

• Authors: Farhatullah Syed, Hitesh J Sanganee, Subir Singh, Ashwani Bahl, Ardeshir Bayat
• Journal: The Journal of investigative dermatology (J Invest Dermatol) Vol. 133 Issue 5 Pg. 1340-50 (May 2013) ISSN: 1523-1747 [Electronic] United States
• PMID: 23303455 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Enzyme Inhibitors
• HIF1A protein, human
• Hypoxia-Inducible Factor 1, alpha Subunit
• Immunosuppressive Agents
• KU-0068650
• Morpholines
• Multiprotein Complexes
• Pyrimidines
• Ku 0063794
• Mechanistic Target of Rapamycin Complex 1
• Mechanistic Target of Rapamycin Complex 2
• Proto-Oncogene Proteins c-akt
• TOR Serine-Threonine Kinases
• Sirolimus

Topics

• Adolescent
• Adult
• Aged
• Cell Movement (drug effects)
• Cell Proliferation (drug effects)
• Cells, Cultured
• Dose-Response Relationship, Drug
• Enzyme Inhibitors (pharmacology, therapeutic use)
• Female
• Humans
• Hypoxia-Inducible Factor 1, alpha Subunit (metabolism)
• Immunosuppressive Agents (pharmacology, therapeutic use)
• In Vitro Techniques
• Keloid (drug therapy, metabolism, pathology)
• Male
• Mechanistic Target of Rapamycin Complex 1
• Mechanistic Target of Rapamycin Complex 2
• Middle Aged
• Morpholines (pharmacology, therapeutic use)
• Multiprotein Complexes (antagonists & inhibitors, drug effects, metabolism)
• Phosphatidylinositol 3-Kinases (metabolism)
• Proto-Oncogene Proteins c-akt (metabolism)
• Pyrimidines (pharmacology, therapeutic use)
• Signal Transduction (drug effects)
• Sirolimus (pharmacology, therapeutic use)
• TOR Serine-Threonine Kinases (antagonists & inhibitors, drug effects, metabolism)
• Young Adult