mTOR inhibitors attenuate ganetespib-driven elevation of HSPs in multiple tumor cell types. A375 melanoma cells were treated with vehicle, ganetespib (25 nmol/L), BEZ235 (500 nmol/L), or temsirolimus (500 nmol/L), either alone or in combination, for 24 hours. The levels of HSP90α, HSP70, HSP27, and GAPDH were determined by immunoblotting.
Mol Cancer Res 2014 12, 703-13. Temsirolimus (CCI-779, NSC 683864) purchased from Selleck
SCID mice with PC-9/Vec or PC-9/HGF tumors were administered as described in Figure. Four hours after final administration of erlotinib, tumors were harvested, and tumor cell angiogenesis (CD31) were determined by immunohistochemistry.
PLoS One 2013 8, e62104. Temsirolimus (CCI-779, NSC 683864) purchased from Selleck
SCID mice with PC-9/Vec or PC-9/HGF tumors were administered 25 mg/kg erlotinib once daily for 4 days or 50 mg/kg temsirolimus once from day 8. Four hours after final erlotinib administration, tumors were harvested, and the relative levels of proteins in the tumor lysates were determined by western blotting.
PLoS One 2013 8, e62104. Temsirolimus (CCI-779, NSC 683864) purchased from Selleck
Breast cancer cells were pretreated with 100ng/ml EGF for 15 min and then treated with the indicated concentrations of Temsirolimus for 24 hours.
Dr. Zhang of Tianjin Medical University. Temsirolimus (CCI-779, NSC 683864) purchased from Selleck
Quality Control & MSDS
Related Compound Libraries
Temsirolimus (CCI-779, NSC 683864) is available in the following compound libraries:
Administration of Temsirolimus (20 mg/kg i.p., 5 days/week for 2 weeks) in combination with Cisplatin (5 mg/kg i.p., day 1) induces 1.3 times greater growth inhibition of DAOY xenografts than cisplatin treatment alone. 
Low doses of Temsirolimus (5 mg/kg or 10 mg/kg, 3 days per week for 3 weeks) given between courses of Mitoxantrone (1.5 mg/kg) or docetaxe (10 mg/kg) treatment potently increases the growth delay of PC-3 tumors. 
In the absence of FKBP12, Temsirolimus potently inhibits mTOR kinase activity with IC50 of 1.76 μM, similar to that of rapamycin with IC50 of 1.74 μM. Temsirolimus treatment at nanomolar concentrations (10 nM to <5 μM) displays a modest and selective antiproliferative activity via FKBP12-dependent mechanism, but can completely inhibit the proliferation of a broad panel of tumor cells at low micromolar concentrations (5-15 μM), involving FKBP12-independent suppression of mTOR signaling. Temsirolimus treatment at micromolar but not nanomolar concentrations (20 μM) causes a marked decline in global protein synthesis and disassembly of polyribosomes, accompanied by rapid increase in the phosphorylation of translation elongation factor eEF2 and the translation initiation factor eIF2A.  Temsirolimus inhibits the phosphorylation of ribosomal protein S6, more potently in PTEN-positive DU145 cells than in PTEN-negative PC-3 cells, and inhibits cell growth and clonogenic survival of both cells in a concentration-dependent manner.  Temsirolimus (100 ng/mL) potently inhibits proliferation and induces apoptosis in primary human lymphoblastic leukemia (ALL) cells. 
In the NOD/SCID xenograft models with human ALL, Temsirolimus treatment at 10 mg/kg/day produces a decrease in peripheral blood blasts and in splenomegaly  Administration of Temsirolimus (20 mg/kg i.p. 5 days/week) significantly delays the growth of DAOY xenografts by 160% after 1 week and 240% after 2 weeks, compared with controls. Single high-dose of Temsirolimus (100 mg/kg i.p) treatment induces 37% regression of tumor volume within 1 week. Temsirolimus treatment for 2 weeks also delays the growth of rapamycin-resistant U251 xenografts by 148%.  Inhibition of mTOR by Temsirolimus improves performance on four different behavioral tasks and decreases aggregate formation in a mouse model of Huntington disease.  Administration of Temsirolimus induces significant dose-dependent, antitumor responses against subcutaneous growth of 8226, OPM-2, and U266 xenografts with ED50 of 20 mg/kg and 2 mg/kg for 8226 and OPM-2, respectively, which are associated with inhibited proliferation and angiogenesis, induction of apoptosis, and reduction in tumor cell size. 
The Flag-tagged wild-type human mTOR (Flag-mTOR) DNA constructs are transiently transfected into HEK293 cells. Protein extraction and purification of Flag-mTOR are carried out 48 hours later. In vitro kinase assays of purified Flag-mTOR in the presence of various concentrations of Temsirolimus without FKBP12 are performed in 96-well plate and detected by dissociation-enhanced lanthanide fluorescent immunoassay (DELFIA) using His6-S6K1 as the substrate. Enzymes is first diluted in kinase assay buffer (10 mM Hepes (pH 7.4), 50 mM NaCl, 50 mM β-glycerophosphate, 10 mM MnCl2, 0.5 mM DTT, 0.25 μM microcystin LR, and 100 μg/mL BSA). To each well, 12 μL of the diluted enzyme is mixed briefly with 0.5 μL Temsirolimus. The kinase reaction is initiated by adding 12.5 μL kinase assay buffer containing ATP and His6-S6K to give a final reaction volume of 25 μL containing 800 ng/mL FLAG-mTOR, 100 μM ATP, and 1.25 μM His6-S6K. The reaction plate is incubated for 2 hours (linear at 1-6 hours) at room temperature with gentle shaking and then terminated by adding 25 μL Stop buffer (20 mM Hepes (pH 7.4), 20 mM EDTA, and 20 mM EGTA). The DELFIA detection of the phosphorylated (Thr-389) His6-S6K is performed at room temperature using a monoclonal anti-P(T389)-p70S6K antibody labeled with Europium-N1-ITC (Eu) (10.4 Eu per antibody). 45 μL of the terminated kinase reaction mixture is transferred to a MaxiSorp plate containing 55 μL PBS. The His6-S6K is allowed to attach for 2 hours after which the wells are aspirated and washed once with PBS. 100 μL of DELFIA buffer with 40 ng/mL Eu-P(T389)-S6K antibody is added. The antibody binding is continued for 1 hour with gentle agitation. The wells are then aspirated and washed four times with PBS containing 0.05% Tween 20 (PBST). 100 μL of DELFIA Enhancement solution is added to each well and the plates are read in a PerkinElmer Victor model plate reader.
Female athymic nude mice injected s.c. with DAOY, or U251 cells
Prepared in 100% EtOH as a 50 mg/mL stock solution, and diluted in 5% Tween 80 and 5% polyethylene glycol 400
Injection daily 5 times per week
Conversion of different model animals based on BSA (Value based on data from FDA Draft Guidelines)
Body Surface Area (m2)
Animal A (mg/kg) = Animal B (mg/kg) multiplied by
Animal B Km
Animal A Km
For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.
American Society of Clinical Oncology|AstraZeneca|Bayer|B
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* <1 mg/ml means slightly soluble or insoluble. * Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
BEZ235 (NVP-BEZ235, Dactolisib) is a dual ATP-competitive PI3K and mTOR inhibitor for p110α/γ/δ/β and mTOR(p70S6K) with IC50 of 4 nM /5 nM /7 nM /75 nM /6 nM in cell-free assays, respectively. Inhibits ATR with IC50 of 21 nM in 3T3TopBP1-ER cell.
Palbociclib (PD-0332991) HCl is a highly selective inhibitor of CDK4/6 with IC50 of 11 nM/16 nM in cell-free assays, respectively. It shows no activity against CDK1/2/5, EGFR, FGFR, PDGFR, InsR, etc. Phase 3.
Features:Non-cytotoxic, and halts cancer cell growth & could be used in glioblastoma that has relapsed after temozolomide treatment (a chemotherapeutic used to treat many cancers).
MK-2206 2HCl is a highly selective inhibitor of Akt1/2/3 with IC50 of 8 nM/12 nM/65 nM in cell-free assays, respectively; no inhibitory activities against 250 other protein kinases observed. Phase 2.
Features:The first allosteric small molecule inhibitor of Akt to enter clinical development.
Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.
Dorsomorphin is a potent, reversible, selective AMPK inhibitor with Ki of 109 nM in cell-free assays, exhibiting no significant inhibition of several structurally related kinases including ZAPK, SYK, PKCθ, PKA, and JAK3. Also inhibits type I BMP receptor activity.
INK 128 (MLN0128) is a potent and selective mTOR inhibitor with IC50 of 1 nM in cell-free assays; >200-fold less potent to class I PI3K isoforms, superior in blocking mTORC1/2 and sensitive to pro-invasion genes (vs Rapamycin). Phase 1.