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-109179A
    Itacnosertib hydrochloride
    		Inhibitor 99.43%
    Itacnosertib hydrochloride (TP-0184 hydrochloride) is the inhibitor for FLT3, ACVR1 (ALK2, IC50=8 nM) and JAK2 (IC50=8540 nM). Itacnosertib hydrochloride exhibits anti-leukemic activity.
    Itacnosertib hydrochloride
  • HY-132902
    DEPTOR-IN-1
    		Inhibitor 98.13%
    DEPTOR-IN-1 is a novel putative DEPTOR inhibitor with a Kd value of 9.3 μM.
    DEPTOR-IN-1
  • HY-16728
    Rapastinel
    		Activator 99.78%
    Rapastinel (GLYX-13) is a potent NMDAR modulator capable of crossing the blood-brain barrier, and it exhibits extremely high affinity for human NMDAR (EC50=0.0017-9.9 nM). Rapastinel enhances ERK signaling and activates the mTOR pathway, thereby upregulating the expression of BDNF and VGF, and inducing significant neuroplastic changes such as enhanced LTP and increased mature dendritic spine density in the hippocampus. Rapastinel moderately elevates the efflux of dopamine, norepinephrine and 5-HT in the prefrontal cortex, and uniquely avoids side effects of traditional antidepressants such as dissociation, addiction or sedation. Rapastinel is applicable to the research of major depressive disorder and hepatocellular carcinoma.
    Rapastinel
  • HY-153789
    PI5P4Kγ-IN-1
    		Activator 98.82%
    PI5P4Kγ-IN-1 is an ATP-competitive, highly selective chemical probe for PI5P4Kγ, with a Kd of 19 nM and an IC50 of 67 nM. PI5P4Kγ-IN-1 effectively inhibits PI5P4Kγ function and activates the mTORC1 signaling pathway in cells. PI5P4Kγ-IN-1 can be used in studies related to diseases such as breast cancer.
    PI5P4Kγ-IN-1
  • HY-176166
    PD-M6
    		Degrader 98.17%
    PD-M6 is a mTOR PROTAC degrader (DC50: 4.8 μM). PD-M6 promotes ubiquitination and degradation of mTOR. PD-M6 downregulates MAPKAP1 and CASTOR1, and induces Autophagy. PD-M6 inhibits the proliferation of cervical cancer, breast cancer and liver cancer cell lines. PD-M6 can be used for the research of cervical cancer, breast cancer and liver cancer.
    PD-M6
  • HY-156027
    SIRT6-IN-3
    		Inhibitor 98.19%
    SIRT6-IN-3 (compound 8a) is a selective inhibitor of SIRT6 (IC50=7.49 μM). SIRT6-IN-3 inhibits pancreatic ductal adenocarcinoma (PDAC) cells proliferation and induces apoptosis. SIRT6-IN-3 increases the sensitivity of cancer cells to gemcitabine (HY-17026) via blocking the DNA damage repair pathway. SIRT6-IN-3 is used in pancreatic cancer research.
    SIRT6-IN-3
  • HY-N0837R
    Veratramine (Standard)
    		Inhibitor
    Veratramine (NSC17821; NSC23880) (Standard) is the analytical standard of Veratramine (HY-N0837). This product is intended for research and analytical applications. Veratramine (NSC17821; NSC23880) is an orally active inhibitor of the PI3K/Akt/mTOR signaling pathway and a SIGMAR1 modulator. Veratramine induces autophagic apoptosis of tumor cells, arrests the cell cycle at the G0/G1 phase, and inhibits epithelial-mesenchymal transition (EMT)-related proteins to reduce tumor migration. Veratramine reduces spinal cord and sciatic nerve pathological damage in a neuropathy model by inhibiting SIGMAR1 binding to NMDAR and phosphorylation of NMDAR Ser896. Veratramine has anti-tumor proliferation, apoptosis induction, anti-inflammatory and neuroprotective activities, and can be used in the study of cancers such as liver cancer and osteosarcoma, as well as diabetic peripheral neuropathy.
    Veratramine (Standard)
  • HY-163199
    ASCT2-IN-2
    		Inhibitor 99.10%
    ASCT2-IN-2 (compound 25e) is an ASCT2 inhibitor with IC50 of 5.14 μM. ASCT2-IN-2 regulates amino acid metabolism as well as mTOR signaling and thereby induces cell apoptosis. ASCT2-IN-2 inhibits tumor growth.
    ASCT2-IN-2
  • HY-N6841
    Rhodiolin
    		Inhibitor 98%
    Rhodiolin, a flavonoid, is an orally active glucose 6-phosphate isomerase (GPI) inhibitor. Rhodiolin inhibits papillary thyroid cancer (PTC) by targeting glycolysis enzyme glucose 6-phosphate isomerase GPI and suppressing PI3K/AKT/mTOR phosphorylation and induce apoptosis. Rhodiolin as a NS2B-NS3 protease inhibitor can disrupt dengue viral replication. Rhodiolin is also a potential candidate for developing anticancer strategies inhibiting CK1ε kinase. Rhodiolin can be used for the study of anti-tumor and anti-viral .
    Rhodiolin
  • HY-B1787
    Sulindac sulfone
    		Inhibitor 98.10%
    Sulindac sulfone is an orally active metabolite of Sulindac (HY-B0008). Sulindac sulfone activates PPARγ and drives transcriptional induction of SSAT by binding to the PPRE-2 element. Sulindac sulfone induces Apoptosis. Sulindac sulfone negatively regulates the function of VDAC1/2 to inhibit the mTORC1 pathway, reduces Cyclin D1 levels, and induces G1 cell cycle arrest in colon cancer cells. Sulindac sulfone exerts colon cancer preventive effects through a COX-independent mechanism. Sulindac sulfone can be used in research related to colon cancer.
    Sulindac sulfone
  • HY-N0390S4
    L-Glutamine-5-13C
    		Inhibitor 98.0%
    L-Glutamine-5-13C is the 13C-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-5-<sup>13</sup>C
  • HY-N2303
    Eriocalyxin B
    		Inhibitor 99.93%
    Eriocalyxin B is a diterpenoid compound that can be isolated from Chinese herb Isodon eriocalyx. Eriocalyxin B exhibits multiple activities, such as anti-cancer, anti-inflammatory, and inhibition of adipogenesis. Eriocalyxin B is capable of inducing apoptosis and autophagy in tumor cells. Eriocalyxin B can be used in the research of cancers, autoimmune diseases, and other conditions.
    Eriocalyxin B
  • HY-W011927R
    4,4'-Sulfonyldiphenol (Standard)
    		Agonist
    4,4'-Sulfonyldiphenol (Bisphenol S; Bis(4-hydroxyphenyl) sulfone) (Standard) is the analytical standard of 4,4'-Sulfonyldiphenol (HY-W011927). This product is intended for research and analytical applications. 4,4'-Sulfonyldiphenol, a substitute for Bisphenol A (HY-18260), is widely used in industrial and consumer products. 4,4'-Sulfonyldiphenol is an estrogen receptor (ER) agonist and can competitively bind to thyroid hormone receptors (TR) with IC50 values for TRα and TRβ are 2650 μM and 2294 μM respectively, thereby affecting breast development and reducing the expression of androgen receptor (AR) in fetal testes. 4,4'-Sulfonyldiphenol promotes the progression of glioblastoma by upregulating the EZH2 mediated PI3K/AKT/mTOR pathway. Under chronic exposure, 4,4'-Sulfonyldiphenol can cause significant lipid deposition and dyslipidemia in the mouse liver by upregulating JunB and Atf3, and has a role in causing obesity at low doses. 4,4'-Sulfonyldiphenol induces intestinal inflammation by altering the intestinal microbiome. 4,4'-Sulfonyldiphenol accelerates the progression of atherosclerosis in zebrafish embryo larvae.
    4,4'-Sulfonyldiphenol (Standard)
  • HY-118717
    mTOR inhibitor WYE-28
    		Inhibitor 99.75%
    mTOR inhibitor WYE-28 (compound 28) is a selective inhibitor of mTOR>/b< (IC50)=0.08 nM. mTOR inhibitor WYE-28 inhibits PI3Kα with an IC50 value of 6 nM. mTOR inhibitor WYE-28 shows a metabolic time (T1/2) in nude mouse microsomes of 13 min.
    mTOR inhibitor WYE-28
  • HY-N10303
    Withangulatin A
    		Inhibitor 99.76%
    Withangulatin A is the inhibitor for COX-2. Withangulatin A inhibits MAPK, NF-κB, Akt/mTOR/p70S6K pathway, exhibits antitumor, anti-inflammatory and trypanocidal activities.
    Withangulatin A
  • HY-10812
    GNE-490
    		Inhibitor
    GNE-490, a (thienopyrimidin-2-yl)aminopyrimidine, is a potent pan-PI3K inhibitor with IC50s of 3.5 nM, 25 nM, 5.2 nM, 15 nM for  PI3Kα, PI3Kβ, PI3Kδ and PI3Kγ, respectively. GNE-490 has >200 fold selectivity for mTOR (IC50=750 nM). GNE-490 shows potent suppression efficacy profile against MCF7.1 breast cancer xenograft model.
    GNE-490
  • HY-B0725A
    Doxepin
    		99.66%
    Doxepin inhibits reuptake of serotonin and norepinephrine as a tricyclic antidepressant. Doxepin has therapeutic effects in atopic dermatitis，chronic urticarial，can improve cognitive processes， protect central nervous system. Doxepin has also been proposed as a protective factor against oxidative stress.
    Doxepin
  • HY-124036
    DS-7423
    		Inhibitor 99.83%
    DS-7423 is a dual PI3K and mTOR inhibitor, with IC50 values of 15.6 nM, 34.9 nM for PI3Kα and mTOR, respectively. DS-7423 possesses anti-tumor activity.
    DS-7423
  • HY-N2911
    Auriculasin
    		Inhibitor 98.58%
    Auriculasin is an anticancer agent that inhibits VEGFR2, PI3K/AKT/mTOR, MAPK. Auriculasin can inhibit cell proliferation, induce cell apoptosis, and inhibit angiogenesis, and promotes mitochondrial oxidative stress and ferroptosis. Auriculasin is also active at the cannabinoid receptor CB1 with an IC50 of 8.92 μM. Auriculasin can be used in cancer research, especially related diseases such as prostate cancer and non-small cell lung cancer, as well as research on the development of anti-angiogenic drugs.
    Auriculasin
  • HY-N11709
    Theasaponin E1
    		Inhibitor 98.68%
    Theasaponin E1 is an orally effective tea saponin. Theasaponin E1 inhibits the proliferation of cancer cells by activating apoptosis. Theasaponin E1 inhibits angiogenesis in ovarian cancer cells and HUVECs by reducing the expression of VEGF. Theasaponin E1 upregulates the phosphorylation level of ATM protein and the expression level of PTEN protein in cancer cells, decreases the phosphorylation levels of Akt, mTOR, p70S6K and 4E-BP1 proteins, downregulates the expression of HIF-1α and NF-κB, and reduces the protein expression of Notch ligands Dll4 and Jagged1. Theasaponin E1 exerts neuroprotective effects by inhibiting the activity of acetylcholinesterase, activating α-secretase and neprilysin, reducing the concentration of Aβ, and inhibiting the activities of β-secretase and γ-secretase. Theasaponin E1 exhibits toxic effects on cancer cells and quinone reductase-inducing activity, and inhibits tumor growth in vivo. Theasaponin E1 induces ferroptosis in Pomacea canaliculata by synergistically disrupting cholesterol homeostasis and sphingolipid metabolism. Theasaponin E1 possesses anti-biofilm activity against Candida albicans. Theasaponin E1 can be used in the research of ovarian cancer, obesity, Alzheimer's disease and fungal infections.
    Theasaponin E1
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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