Molecular Weight (MW)

990.21

Formula

C53H84NO14P

CAS No.

572924-54-0

Storage

-20℃ for 3 years in powder form

-80℃ for 2 years in solvent

Solubility (In vitro)

DMSO: 198 mg/mL (200 mM)

Water: <1 mg/mL

Ethanol: <1 mg/mL

Solubility (In vivo)

O=P(C)(C)O[C@H]1[C@H](OC)C[C@H](C[C@H]([C@H](CC([C@H](C)/C=C(C)/[C@@H](O)[C@H]2OC)=O)OC([C@]3([H])CCCCN3C(C([C@@](O4)(O)[C@H](C)CC[C@@]4([H])C[C@H](OC)/C(C)=C\C=C\C=C\[C@@H](C)C[C@@H](C)C2=O)=O)=O)=O)C)CC1

Synonyms

AP23573, Deforolimus, MK-8669; AP23573; AP 23573; AP-23573; MK8669; MK 8669; MK-8669; Deforolimus, Ridaforolimus

In Vitro

Kinase Assay: Cell based target inhibition: HT-1080 cells are treated with increasing concentrations of Deforolimus (0-100 nM) for 2 hours, prior to harvest. Cellular lysates are extracted in denaturing lysis buffer, resolved on SDS-PAGE and transferred to PVDF membranes. After blocking, membranes are incubated with primary antibodies for 1 hour, followed by appropriate HRPconjugated secondary antibodies for 1 hour at room temperature. Immunoreactive proteins are detected using enhanced chemiluminescence and autoradiography performed by exposure to X-ray film. IC50 is determined from the inhibition of levels of phosphorylated ribosomal protein S6 (p-S6) and 4E-BP1 (p-4E-BP1).

Cell Assay: Cells (Colo205, H1755, H1395, H1666, A549, H157, and H1703 cells) are seeded at 2-3 × 104/mL, and serial dilutions of Deforolimus are added after 2 hours, for at least three cell doublings (72-120 hours). Deforolimus effects are measured using the CellTiter 96 Aqueous nonradioactive cell proliferation assay and Sulforhodamine B assays. For Deforolimus, growth effects are described as IC30 because rapamycin and its derivatives do not significantly impede cell proliferation.

Treatment of HT-1080 cells with Deforolimus induces a dose-dependent inhibition of phosphorylation of both S6 and 4E-BP1, with IC50 of 0.2 nM and 5.6 nM, respectively, and leads to a decrease in cell size, an increase in the proportion of cells in the G1 phase of the cell cycle, and inhibition of glucose uptake. Deforolimus displays significant antiproliferative activity a broad panel of cell lines with EC50 of 0.2-2.3 nM. Deforolimus potently and selectively inhibits VEGF production in a dose-dependent manner. Deforolimus treatment significantly induces growth suppression in human NSCLC cell lines with IC30 values of 2.45-8.83 nM, with the exception of H157 with IC30 of>20 nM. Deforolimus treatment (2.8-5.9 nM) significantly dephosphorylates p70S6KThr389 in A549, H1703 and H157 cells, except H1666 that may express a resistant variant of mTORC1, and causes increased phosphorylation of pAKTser473 and pAKTThr308 in A549 and H1703 cells. Deforolimus in combination with the MEK inhibitors, CI-1040 or PD0325901 exhibits dose-dependent synergism in lung cancer cell lines, which is associated with the suppression of proliferation rather than enhancement of cell death, involving the inhibition of ribosomal biogenesis by 40% within 24 hours and a decreased polysome/monosome ratio.

In Vivo

Administration of Deforolimus exerts significant antitumor effects in mice bearing PC-3 (prostate), HCT-116 (colon), MCF7 (breast), PANC-1 (pancreas) or A549 (lung) xenografts in a dose-dependent manner, and inhibits mTOR signaling in in SK-LMS-1 xenograft model associated with inhibition of tumor growth.

Animal model

Male and female athymic NCr-nu mice with xenografts established by subcutaneous implantation of PC-3, A549, HCT-116, MCF7, PANC-1 and SK-LMS-1 tumors.

Formulation & Dosage

Formulated in ethanol, and diluted in a vehicle of 4% ethanol, 5% Tween 80, and 5% propylene glycol; 10 mg/kg; i.p. injection.

References

Mol Cancer Ther. 2011 Jun;10(6):1059-71; Cancer Res. 2012 Sep 1;72(17):4483-93.