title: Characterization of LY3023414, a Novel PI3K/mTOR Dual Inhibitor Eliciting Transient Target Modulation to Impede Tumor Growth.
abstract: The PI3K/AKT/mTOR pathway is among the most frequently altered pathways in cancer cell growth and survival. LY3023414 is a complex fused imidazoquinolinone with high solubility across a wide pH range designed to inhibit class I PI3K isoforms and mTOR kinase. Here, we describe the in vitro and in vivo activity of LY3023414. LY3023414 was highly soluble at pH 2-7. In biochemical testing against approximately 266 kinases, LY3023414 potently and selectively inhibited class I PI3K isoforms, mTORC1/2, and DNA-PK at low nanomolar concentrations. In vitro, inhibition of PI3K/AKT/mTOR signaling by LY3023414 caused G1cell-cycle arrest and resulted in broad antiproliferative activity in cancer cell panel screens. In vivo, LY3023414 demonstrated high bioavailability and dose-dependent dephosphorylation of PI3K/AKT/mTOR pathway downstream substrates such as AKT, S6K, S6RP, and 4E-BP1 for 4 to 6 hours, reflecting the drug's half-life of 2 hours. Of note, equivalent total daily doses of LY3023414 given either once daily or twice daily inhibited tumor growth to similar extents in multiple xenograft models, indicating that intermittent target inhibition is sufficient for antitumor activity. In combination with standard-of-care drugs, LY3023414 demonstrated additive antitumor activity. The novel, orally bioavailable PI3K/mTOR inhibitor LY3023414 is highly soluble and exhibits potent in vivo efficacy via intermittent target inhibition. It is currently being evaluated in phase I and II trials for the treatment of human malignancies. Mol Cancer Ther; 15(10); 2344-56. ©2016 AACR.
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
authors.forename: Michele C
authors.initials: MC
authors.lastname: Smith
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
authors.forename: Mary M
authors.initials: MM
authors.lastname: Mader
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
authors.forename: James A
authors.initials: JA
authors.lastname: Cook
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
authors.forename: Philip
authors.initials: P
authors.lastname: Iversen
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
authors.forename: Rose
authors.initials: R
authors.lastname: Ajamie
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
authors.forename: Everett
authors.initials: E
authors.lastname: Perkins
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
authors.forename: Laura
authors.initials: L
authors.lastname: Bloem
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
authors.forename: Yvonne Y
authors.initials: YY
authors.lastname: Yip
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
authors.forename: David A
authors.initials: DA
authors.lastname: Barda
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
authors.forename: Philip P
authors.initials: PP
authors.lastname: Waid
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
authors.forename: Douglas J
authors.initials: DJ
authors.lastname: Zeckner
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
authors.forename: Debra A
authors.initials: DA
authors.lastname: Young
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
authors.forename: Manuel
authors.initials: M
authors.lastname: Sanchez-Felix
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana. donohogp@lilly.com.
authors.forename: Gregory P
authors.initials: GP
authors.lastname: Donoho
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, Indiana.
authors.forename: Volker
authors.initials: V
authors.lastname: Wacheck
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000737:chemistry / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects; D001682:Biological Availability; D002453:Cell Cycle / Q000187:drug effects; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D004195:Disease Models, Animal; D004357:Drug Synergism; D004789:Enzyme Activation / Q000187:drug effects; D006801:Humans; D006863:Hydrogen-Ion Concentration; D051379:Mice; D008958:Models, Molecular; D008968:Molecular Conformation; D019869:Phosphatidylinositol 3-Kinases / Q000737:chemistry / Q000378:metabolism; D000081082:Phosphoinositide-3 Kinase Inhibitors; D010766:Phosphorylation; D011485:Protein Binding; D047428:Protein Kinase Inhibitors / Q000737:chemistry / Q000494:pharmacology*; D015398:Signal Transduction / Q000187:drug effects; D012995:Solubility; D058570:TOR Serine-Threonine Kinases / Q000037:antagonists & inhibitors* / Q000737:chemistry / Q000378:metabolism; D023041:Xenograft Model Antitumor Assays
chemical_list: D000970:Antineoplastic Agents; D019869:Phosphatidylinositol 3-Kinases; D000081082:Phosphoinositide-3 Kinase Inhibitors; D047428:Protein Kinase Inhibitors; D058570:TOR Serine-Threonine Kinases