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-108232
    MK-2206
    		Inhibitor 99.72%
    MK-2206 is an orally active pan-AKT inhibitor, with IC50 values of 8 nM, 12 nM and 65 nM against AKT1, AKT2 and AKT3, respectively. MK-2206 inhibits the Akt/mTOR signaling pathway and reduces the levels of downstream GSK3β and Mcl-1 via proteasomal degradation. MK-2206 induces G1-phase cell cycle arrest, apoptosis, epithelial-mesenchymal transition, fibroblast activation and extracellular matrix deposition. MK-2206 causes transient hyperglycemia and hyperinsulinemia in animals. MK-2206 can be used in research related to solid tumors, renal fibrosis and hypercholesterolemia.
    MK-2206
  • HY-N0270
    Ononin
    		Inhibitor 99.97%
    Ononin is an orally active isoflavone. Ononin inhibits the ERK/JNK/p38 and PI3K/Akt/mTOR pathways. Ononin regulates Apoptosis. Ononin has anti-tumor effects on laryngeal cancer and lung cancer. Ononin has neuroprotective effects. Ononin alleviates endoplasmic reticulum stress and diabetic nephropathy.
    Ononin
  • HY-N0022
    Isoacteoside
    		Inhibitor 99.73%
    Isoacteoside is a natural product that can significantly inhibit the formation of glycation end products. Isoacteoside regulates the AKT/PI3K/m-TOR/NF-κB signaling pathway, induces apoptosis in OVCAR-3 cell. Isoacteoside exhibits antitumor, anti-inflammatory, anti-obesity and neuroprotective activities.
    Isoacteoside
  • HY-16397A
    Phenformin hydrochloride
    		Inhibitor 99.64%
    Phenformin (Phenethylbiguanide) hydrochloride is an orally active biguanide hypoglycemic agent. Phenformin hydrochloride inhibits mitochondrial respiratory chain complex I, leading to an increased AMP/ATP ratio, activation of AMPK, and subsequent inhibition of the mTOR pathway, thereby suppressing cell proliferation, inducing apoptosis and autophagy. Phenformin hydrochloride inhibits cancer stem cells (CSCs) and possesses potent antitumor potential.
    Phenformin hydrochloride
  • HY-W019894
    Manganese chloride
    		Activator 99.1%
    Manganese chloride is an orally active MRI liver contrast agent. Manganese chloride induces Apoptosis and activates the mTOR signaling pathway. Manganese chloride induces cognitive impairment, promotes hematopoietic recovery, and reduces radiation-induced bone marrow and brain damage. It can be used for the study of renal impairment.
    Manganese chloride
  • HY-W012722
    4-Methyl-2-oxopentanoic acid
    		Inhibitor 99.51%
    4-Methyl-2-oxopentanoic acid (α-Ketoisocaproic acid) is a metabolite of L-leucine and is involved in energy metabolism. 4-Methyl-2-oxopentanoic acid increases endoplasmic reticulum stress, promotes lipid accumulation in preadipocytes and insulin resistance by impairing mTOR and autophagy signaling pathways. 4-Methyl-2-oxopentanoic acid also causes oxidative damage, leading to cognitive deficits, inhibits α-ketoglutarate dehydrogenase activity, acts as an oxidative phosphorylation uncoupler and metabolic inhibitor. 4-Methyl-2-oxopentanoic acid acts as a nutrient signal and stimulates skeletal muscle protein synthesis. 4-Methyl-2-oxopentanoic acid can be used in the study of maple syrup urine disease.
    4-Methyl-2-oxopentanoic acid
  • HY-U00434
    3BDO
    		Activator 99.93%
    3BDO is a IFITM3 modulator and mTOR activator with antiviral and autophagy-inhibiting effects. 3BDO exhibits inhibitory activity against porcine coronaviruses. 3BDO increases the protein abundance of IFITM3, inhibits virus-cell membrane fusion, and blocks viral entry. 3BDO inhibits the entry of transmissible gastroenteritis virus, porcine epidemic diarrhea virus, and porcine respiratory coronavirus into host cells. 3BDO can be used for research on porcine coronavirus infection.
    3BDO
  • HY-111373
    RapaLink-1
    		Inhibitor 99.65%
    RapaLink-1, the third-generation bivalent mTOR inhibitor, combines Rapamycin (HY-10219) with MLN0128 (HY-13328, a second-generation mTOR kinase inhibitor) by an inert chemical linker. RapaLink-1 shows better efficacy than Rapamycin or mTOR kinase inhibitors (TORKi), potently blocking cancer-derived, activating mutants of mTOR. RapaLink-1 can cross the blood-brain barrier. RapaLink-1 binding to FKBP12 results in targeted and durable inhibition of mTORC1. RapaLink-1 plays an antithrombotic role in antiphospholipid syndrome by improving autophagy. Anticancer activity.
    RapaLink-1
  • HY-N0047
    Polyphyllin I
    		Inhibitor 99.91%
    Polyphyllin I is a bioactive constituent extracted from Paris polyphylla, has strong anti-tumor activity. Polyphyllin I is an activator of the JNK signaling pathway and is an inhibitor of PDK1/Akt/mTOR signaling. Polyphyllin I induces autophagy, G2/M phase arrest and apoptosis.
    Polyphyllin I
  • HY-114384
    Mefluleucine
    		Activator 98.0%
    Mefluleucine (NV-5138), a leucine analog, is the first selective and orally active brain mTORC1 activator, binding to Sestrin2. Mefluleucine is used for antidepressant studies.
    Mefluleucine
  • HY-N0787
    Cryptochlorogenic acid
    		Inhibitor 99.87%
    Cryptochlorogenic acid (4-Caffeoylquinic acid) is a naturally occurring phenolic acid compound with oral effectiveness, anti-inflammatory, antioxidant and anti-cardiac hypertrophy effects. Alleviating LPS (HY-D1056) and ISO (HY-B0468) by regulating proinflammatory factor expression, inhibiting NF-κB activity, promoting Nrf2 nuclear transfer, and regulating PI3Kα/Akt/ mTOR / HIF-1α signaling pathway Induced physiological stress response.
    Cryptochlorogenic acid
  • HY-P9933
    Dinutuximab
    		Inhibitor ≥99.0%
    Dinutuximab (APN-311) is a chimeric human-mouse anti-GD2 monoclonal antibody. Dinutuximab can bind to GD2 on the cell surface, triggering antibody-dependent cell-mediated cytotoxicity and complement-dependent cytotoxicity, and promoting tumor regression. Dinutuximab can inhibit the growth, invasion, and migration and induce apoptosis of tumor cells. Dinutuximab can be used in the research of tumors such as neuroblastoma and breast cancer.
    Dinutuximab
  • HY-106591A
    4-Vinylcyclohexene dioxide
    		Activator 98.57%
    4-Vinylcyclohexene dioxide (4-Vinylcyclohexene diepoxide) is an orally active metabolite of 4-vinylcyclohexene. 4-Vinylcyclohexene dioxide induces Apoptosis, increases intracellular ROS, and activates the PI3K/Akt/mTOR pathway. 4-Vinylcyclohexene dioxide selectively damages small ovarian follicles, inhibits granulosa cell function, and disrupts the male reproductive system. 4-Vinylcyclohexene dioxide can be used in the study of premature ovarian insufficiency, reproductive toxicity, and related fertility disorders.
    4-Vinylcyclohexene dioxide
  • HY-N0486S9
    L-Leucine-d3
    		Activator 99.98%
    L-Leucine-d3 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>3</sub>
  • HY-155864
    AJ2-30
    		Inhibitor 99.85%
    AJ2-30 is a SLCl5A4 inhibitor. AJ2-30 inhibits endolysosomal TLR7-9-mediated mTOR activation. AJ2-30 blocks endogenous NOD signaling. AJ2-30 can be used in inflammation studies.
    AJ2-30
  • HY-N0390S8
    L-Glutamine-15N2
    		Inhibitor 99.95%
    L-Glutamine-15N2 is the 15N-labeled L-Glutamine (HY-N0390). L-Glutamine is an orally active nutritional agent and cellular metabolism regulator. L-Glutamine is taken up in a Na+-dependent manner and targets multiple key molecules including glutaminase, mTORC1, NF-κB, STAT-3 and HIF-1α. L-Glutamine enhances glutaminolytic catabolism, drives the conversion of glutamate to α-ketoglutarate, thereby regulating gene expression, integrating metabolic signals, mediating glutamine flux and maintaining redox homeostasis. L-Glutamine also promotes cell proliferation, osteogenic differentiation and fracture healing, exerts neuroprotective and cardioprotective effects, and inhibits osteoarthritis. L-Glutamine can be applied to research related to osteoporosis, osteoarthritis, ischemic stroke and acute cantharidin-induced cardiotoxicity.
    L-Glutamine-<sup>15</sup>N<sub>2</sub>
  • HY-155747
    FDW028
    		Inhibitor 99.51%
    FDW028 a potent and highly selective FUT8 inhibitor. FUT8 exhibits potent anti-tumor activity by defucosylation and impelling lysosomal degradation of B7-H3 through the chaperone-mediated autophagy (CMA) pathway. FDW028 can be used for metastatic colorectal cancer (mCRC) research.
    FDW028
  • HY-15177
    PF-04691502
    		Inhibitor 99.33%
    PF-04691502 is a potent and selective inhibitor of PI3K and mTOR. PF-04691502 binds to human PI3Kα, β, δ, γ and mTOR with Kis of 1.8, 2.1, 1.6, 1.9 and 16 nM, respectively.
    PF-04691502
  • HY-N9481
    Lipoteichoic acid
    		Inhibitor
    Lipoteichoic acid is an orally effect anti-inflammatory and antitumor agent. Lipoteichoic acid is a crucial immune molecule in Gram-positive bacteria that activates the complement system by inducing C3 and inhibiting CD55. Lipoteichoic acid regulates macrophage autophagy through the PI3K/Akt/mTOR pathway. Lipoteichoic acid induces lung damage in mice. Lipoteichoic acid inhibits the production of melanin.
    Lipoteichoic acid
  • HY-N0390S
    L-Glutamine-15N
    		Inhibitor 99.6%
    L-Glutamine-15N is the 15N-labeled L-Glutamine (HY-N0390). L-Glutamine is an orally active nutritional agent and cellular metabolism regulator. L-Glutamine is taken up in a Na+-dependent manner and targets multiple key molecules including glutaminase, mTORC1, NF-κB, STAT-3 and HIF-1α. L-Glutamine enhances glutaminolytic catabolism, drives the conversion of glutamate to α-ketoglutarate, thereby regulating gene expression, integrating metabolic signals, mediating glutamine flux and maintaining redox homeostasis. L-Glutamine also promotes cell proliferation, osteogenic differentiation and fracture healing, exerts neuroprotective and cardioprotective effects, and inhibits osteoarthritis. L-Glutamine can be applied to research related to osteoporosis, osteoarthritis, ischemic stroke and acute cantharidin-induced cardiotoxicity.
    L-Glutamine-<sup>15</sup>N
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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