2. Signaling Pathways
  3. PI3K/Akt/mTOR
  4. mTOR

mTOR

Mammalian target of Rapamycin

mTOR

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mTOR (mammalian target of Rapamycin) is a protein that in humans is encoded by the mTOR gene. mTOR is a serine/threonine protein kinase that regulates cell growth, cell proliferation, cell motility, cell survival, protein synthesis, and transcription. mTOR belongs to the phosphatidylinositol 3-kinase-related kinase protein family. mTOR integrates the input from upstream pathways, including growth factors and amino acids. mTOR also senses cellular nutrient, oxygen, and energy levels. The mTOR pathway is dysregulated in human diseases, such as diabetes, obesity, depression, and certain cancers. Rapamycin inhibits mTOR by associating with its intracellular receptor FKBP12. The FKBP12-rapamycin complex binds directly to the FKBP12-Rapamycin Binding (FRB) domain of mTOR, inhibiting its activity.

mTOR Isoform Specific Products:

mTOR Isoform Comparison
Cat. No. Product Name Effect Purity Chemical Structure
  • HY-175751
    LRK-4189
    		Modulator
    LRK-4189 is an orally active PIP4K2C (a regulator of mTOR complex) degrader and type 1 immune activator. LRK-4189 induces the degradation of the lipid kinase PIP4K2C. LRK-4189 triggers the interferon signaling pathway in microsatellite-stable (MSS) colorectal cancer cells, activates immunogenic tumor killing, and induces endogenous cell death. LRK-4189 sensitizes microsatellite-stable colorectal cancer tumors to NK cell killing and dendritic cell phagocytosis. LRK-4189 can be used for the research of microsatellite-stable colorectal cancer.
    LRK-4189
  • HY-W130610R
    Stearamide (Standard)
    		Activator
    Ginsenoside C-K (Standard) is the analytical standard of Ginsenoside C-K. This product is intended for research and analytical applications. Ginsenoside C-K, a bacterial metabolite of G-Rb1, exhibits anti-inflammatory effects by reducing iNOS and COX-2. Ginsenoside C-K exhibits an inhibition against the activity of CYP2C9 and CYP2A6 in human liver microsomes with IC50s of 32.0±3.6 μM and 63.6±4.2 μM, respectively.
    Stearamide (Standard)
  • HY-137315
    TML-6
    		Inhibitor 98.34%
    TML-6, an orally active curcumin derivative, inhibits the synthesis of the β-amyloid precursor protein and β-amyloid (Aβ). TML-6 can upregulate Apo E, suppress NF-κB and mTOR, and increase the activity of the anti-oxidative Nrf2 gene. TML-6 has the potential for Alzheimer’s disease (AD) research.
    TML-6
  • HY-172423
    Darlifarnib
    		Inhibitor
    Darlifarnib (KO-2806) is an orally active farnesyl transferase inhibitor. Darlifarnib inhibits the mTORC1 signaling pathway, thereby enhancing the anti-angiogenic properties of tyrosine kinase inhibitors. When used in combination with anti-VEGFR tyrosine kinase inhibitors, Darlifarnib promotes renal cell carcinoma tumor regression and inhibits tumor neovascularization. Darlifarnib sensitizes renal cell carcinoma tumors that progress after anti-VEGFR TKI treatment.
    Darlifarnib
  • HY-147284
    PI3K-IN-37
    		Inhibitor 99.0%
    PI3K-IN-37 (Example 84.1) is a PI3K α/β/δ inhibitor with IC50s of 6, 8, 4 nM, respectively. PI3K-IN-37 can also inhibit mTOR (IC50=4 nM).
    PI3K-IN-37
  • HY-10620
    PI3K-IN-22
    		Inhibitor 99.50%
    PI3K-IN-22 is a PI3Kα/mTOR dual kinase inhibitor. PI3K-IN-22 has IC50s of 0.9, 0.6 nM for PI3Kα and mTOR, respectively. PI3K-IN-22 can be used for the research of cancer.
    PI3K-IN-22
  • HY-110109
    ETP-45658
    		Inhibitor 98.97%
    ETP-45658 is a potent PI3K inhibitor, with IC50s of 22.0 nM, 39.8 nM, 129.0 nM and 717.3 nM for PI3Kα, PI3Kδ, PI3Kβ and PI3Kγ, respectively. ETP-45658 also can inhibit DNA-PK (IC50=70.6 nM) and mTOR (IC50=152.0 nM). ETP-45658 can be used for the research of cancer.
    ETP-45658
  • HY-N0486S6
    L-Leucine-2-13C,15N
    		Activator 98.0%
    L-Leucine-2-13C,15N is the 13C- and 15N-labeled L-Leucine. L-Leucine is an essential branched-chain amino acid (BCAA), which activates the mTOR signaling pathway.
    L-Leucine-2-<sup>13</sup>C,<sup>15</sup>N
  • HY-N0427
    Phellodendrine
    		Agonist 99.60%
    Phellodendrine is an orally active plant alkaloid. Phellodendrine inhibits the proliferation of KRAS-mutated pancreatic cancer cells by suppressing macropinocytosis and glutamine metabolism, inducing ROS accumulation and mitochondrial apoptosis. Phellodendrine promotes autophagy by activating the AMPK/mTOR pathway, alleviating intestinal damage in ulcerative colitis. Phellodendrine can alleviate gouty arthritis by inhibiting the IL-6/STAT3 signaling pathway. Phellodendrine suppresses allergic reactions by altering the conformation of MRGPRB3/MRGPRX2 protein, thereby inhibiting the activation of PKC and subsequent downstream MAPK and NF-κB signaling. Phellodendrine inhibits the AKT/NF-κB pathway and down-regulates the expression of COX-2, thereby protecting zebrafish embryos from oxidative stress. Phellodendrine has an anti-major depressive disorder (MDD) effect by down-regulating CHRM1, HTR1A, and the PI3K/Akt signaling pathway.
    Phellodendrine
  • HY-125953
    Ceramide (Egg)
    		99%
    Ceramide (Egg) (Ceramide (Egg, Chicken)) is a ceramide from chicken. Ceramide (Egg) is a sphingomyelin signaling pathway second messenger. Ceramide (Egg) activates PP2A, JNK, p38 MAPK, CAPK, ceramide-activated protein phosphatase, Vav, PKCζ, and SAPK/JNK cascade. Ceramide (Egg) downregulates or inhibits AKT, survivin, CDK2, mTOR, and FLIP. Ceramide (Egg) mediates apoptosis, autophagy, cell cycle arrest, mitochondrial dysfunction, redox state shifts, and ROS generation. Ceramide (Egg) can be used for the research of cancer and neurological disease.
    Ceramide (Egg)
  • HY-11080A
    PKI-179 hydrochloride
    		Inhibitor 99.66%
    PKI-179 hydrochloride is a potent and orally active dual PI3K/mTOR inhibitor, with IC50s of 8 nM, 24 nM, 74 nM, 77 nM, and 0.42 nM for PI3K-α, PI3K-β, PI3K-γ, PI3K-δ and mTOR, respectively. PKI-179 hydrochloride also exhibits activity over E545K and H1047R, with IC50s of 14 nM and 11 nM, respectively. PKI-179 hydrochloride shows anti-tumor activity in vivo.
    PKI-179 hydrochloride
  • HY-141805
    MHY-1685
    		Inhibitor 99.84%
    MHY-1685, a novel mammalian target of rapamycin (mTOR) inhibitor, provides opportunities to improve hCSC-based myocardial regeneration.
    MHY-1685
  • HY-174066
    SI-W052
    		Inhibitor 98.0%
    SI-W052 is an orally active, brain-penetrant and selective small-molecule inhibitor targeting mTOR and TEX264. SI-W052 activates autophagy by inhibiting mTOR phosphorylation and enhances TEX264 expression to promote ER turnover, suppressing LPS-induced release of inflammatory factors (TNF-α, IL-6). SI-W052 is promising for research of Alzheimer’s disease (AD)-associated neuroinflammation.
    SI-W052
  • HY-176761
    NSC647889
    		Inhibitor 99.28%
    NSC647889 is an apoptosis and autophagy inducer. NSC647889 induces apoptosis, inhibits mTOR pathway and abrogates DNA synthesis. NSC647889 triggers LC3-positive vesicle formation, modulates AKT and 4EBP1 phosphorylation and shows heightened caspase-3 activation in multicellular spheroids. NSC647889 can be used for the research of solid cancer tumour, head-neck carcinoma, and colorectal cancer.
    NSC647889
  • HY-153120A
    PI3K/mTOR Inhibitor-13 sodium
    		Inhibitor 98.11%
    PI3K/mTOR Inhibitor-13 sodium is an orally active dual inhibitor of phosphoinositol 3-kinase (PI3K) and mTOR kinase. PI3K/mTOR Inhibitor-13 sodium has potential applications in sexual diseases, solid tumor and idiopathic pulmonary fibrosis (IPF).
    PI3K/mTOR Inhibitor-13 sodium
  • HY-15269
    PP30
    		Inhibitor 98.01%
    PP30 is a potent, selective, ATP-competitive mTOR inhibitor with an IC50 of 80 nM. PP30 blocks insulin-stimulated phosphorylation of Akt at residues S473 and T308, preventing the full activation of Akt. PP30 is applicable for cancer research.
    PP30
  • HY-156671A
    RMC-4998 formic
    		Inhibitor 99.02%
    RMC-4998 formic is an orally active inhibitor targeting the active or GTP-bound state of the KRASG12C mutant. RMC-4998 formic can form a ternary complex with intracellular CYPA and the activated KRASG12C mutant, with an IC50 value of 28 nM. RMC-4998 formic can inhibit ERK signaling in KRASG12C mutant cancer cells and induce apoptosis. RMC-4998 formic can be used for non-small cell lung cancer (NSCLC) research.
    RMC-4998 formic
  • HY-155066
    FD274
    		Inhibitor 99.45%
    FD274 is a highly potent PI3K/mTOR dual inhibitor with IC50s of 0.65 nM, 1.57 nM, 0.65 nM, 0.42 nM, and 2.03 nM against PI3Kα/β/γ/δ and mTOR, respectively. FD274 exhibits significant anti-proliferation of AML cell lines (HL-60 and MOLM-16). FD274 arrests HL-60 cell cycle at G1 phase and increases apoptosis. FD274 demonstrates dose-dependent inhibition of tumor growth in the HL-60 xenograft model. FD274 has the potential for acute myeloid leukemia research.
    FD274
  • HY-N0486S12
    L-Leucine-d2
    		Activator 99.81%
    L-Leucine-d2 is the deuterium labeled L-Leucine. L-Leucine is an essential branched-chain amino acid (BCAA), which activates the mTOR signaling pathway.
    L-Leucine-d<sub>2</sub>
  • HY-12652
    AZD3147
    		Inhibitor 99.93%
    AZD3147 is a potent, orally active, selective dual inhibitor of mTORC1 and mTORC2 with an IC50 value of 1.5 nM. AZD3147 also has a selective effect on PI3K.
    AZD3147
Cat. No. Product Name / Synonyms Application Reactivity
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Download mTOR Signaling Pathway Map.

The mammalian target of rapamycin (mTOR) signaling pathway integrates both intracellular and extracellular signals and serves as a central regulator of cell metabolism, growth, proliferation and survival[1]. mTOR is the catalytic subunit of two distinct complexes called mTORC1 and mTORC2. mTORC1 comprises DEPTOR, PRAS40, RAPTOR, mLST8, mTOR, whereas mTORC2 comprises DEPTOR, mLST8, PROTOR, RICTOR, mSIN1, mTOR[2]. Rapamycin binds to FKBP12 and inhibits mTORC1 by disrupting the interaction between mTOR and RAPTOR. mTORC1 negatively regulates autophagy through multiple inputs, including inhibitory phosphorylation of ULK1 and TFEB. mTORC1 promotes protein synthesis through activation of the translation initiation promoter S6K and through inhibition of the inhibitory mRNA cap binding 4E-BP1, and regulates glycolysis through HIF-1α. It promotes de novo lipid synthesis through the SREBP transcription factors. mTORC2 inhibits FOXO1,3 through SGK and Akt, which can lead to increased longevity. The complex also regulates actin cytoskeleton assembly through PKC and Rho kinase[3]. 

 

Growth factors: Growth factors can signal to mTORC1 through both PI3K-Akt and Ras-Raf-MEK-ERK axis. For example, ERK and RSK phosphorylate TSC2, and inhibit it.

 

Insulin Receptor: The activated insulin receptor recruits intracellular adaptor protein IRS1. Phosphorylation of these proteins on tyrosine residues by the insulin receptor initiates the recruitment and activation of PI3K. PIP3 acts as a second messenger which promotes the phosphorylation of Akt and triggers the Akt-dependent multisite phosphorylation of TSC2. TSC is a heterotrimeric complex comprised of TSC1, TSC2, and TBC1D7, and functions as a GTPase activating protein (GAP) for the small GTPase Rheb, which directly binds and activates mTORC1. mTORC2 primarily functions as an effector of insulin/PI3K signaling. 

 

Wnt: The Wnt pathway activates mTORC1. Glycogen synthase kinase 3β (GSK-3β) acts as a negative regulator of mTORC1 by phosphorylating TSC2. mTORC2 is activated by Wnt in a manner dependent on the small GTPase RAC1[4].

 

Amino acids: mTORC1 senses both lysosomal and cytosolic amino acids through distinct mechanisms. Amino acids induce the movement of mTORC1 to lysosomal membranes, where the Rag proteins reside. A complex named Ragulator, interact with the Rag GTPases, recruits them to lysosomes through a mechanism dependent on the lysosomal v-ATPase, and is essential for mTORC1 activation. In turn, lysosomal recruitment enables mTORC1 to interact with GTP-bound RHEB, the end point of growth factor. Cytosolic leucine and arginine signal to mTORC1 through a distinct pathway comprised of the GATOR1 and GATOR2 complexes.    

 

Stresses: mTORC1 responds to intracellular and environmental stresses that are incompatible with growth such as low ATP levels, hypoxia, or DNA damage. A reduction in cellular energy charge, for example during glucose deprivation, activates the stress responsive metabolic regulator AMPK, which inhibits mTORC1 both indirectly, through phosphorylation and activation of TSC2, as well as directly through the phosphorylation of RAPTOR. Sestrin1/2 are two transcriptional targets of p53 that are implicated in the DNA damage response, and they potently activate AMPK, thus mediating the p53-dependent suppression of mTOR activity upon DNA damage. During hypoxia, mitochondrial respiration is impaired, leading to low ATP levels and activation of AMPK. Hypoxia also affects mTORC1 in AMPK-independent ways by inducing the expression of REDD1, the protein products of which then suppress mTORC1 by promoting the assembly of TSC1-TSC2[2].

 

Reference:

[1]. Laplante M, et al.mTOR signaling at a glance.J Cell Sci. 2009 Oct 15;122(Pt 20):3589-94. 
[2]. Zoncu R, et al. mTOR: from growth signal integration to cancer, diabetes and ageing.Nat Rev Mol Cell Biol. 2011 Jan;12(1):21-35. 
[3]. Johnson SC, et al. mTOR is a key modulator of ageing and age-related disease.Nature. 2013 Jan 17;493(7432):338-45.
[4]. Shimobayashi M, et al. Making new contacts: the mTOR network in metabolism and signalling crosstalk.Nat Rev Mol Cell Biol. 2014 Mar;15(3):155-62.

mTOR Isoform Comparison

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