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

mTOR

Mammalian target of Rapamycin

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.

Cat. No. Product Name Effect Purity Chemical Structure
  • HY-128483R
    Fusaric acid (Standard)
    Inhibitor
    Fusaric acid (Standard) is the analytical standard of Fusaric acid (HY-128483). This product is intended for research and analytical applications. Fusaric acid is an orally active multi-pathway inhibitor with the activity of inducing oxidative stress and apoptosis. Fusaric acid can chelate divalent metal cations, damage mitochondrial membrane structure, and activate apoptosis-related proteases such as Caspase-3/7, -8, and -9. Fusaric acid also regulates Bax/Bcl-2 protein, inhibits fibrosis-related signaling pathways such as NF-κB, TGF-β1/SMADs, and PI3K/AKT/mTOR, and reduces collagen deposition. Fusaric acid is also a dopamine β-hydroxylase inhibitor, which reduces endogenous levels of norepinephrine and epinephrine in the brain, heart, spleen, and adrenal glands. Fusaric acid can play a role in myocardial fibrosis and improve cardiac hypertrophy in heart disease, and can also be used in the study of esophageal cancer and liver cancer.
    Fusaric acid (Standard)
  • HY-P10323
    T7 Peptide
    Inhibitor
    T7 peptide is an endothelial cell-specific inhibitor. T7 peptide interacts with αVβ3 integrin to inhibit the FAK, PI3-kinase, PKB/Akt, and mTOR signaling pathways in endothelial cells, ultimately suppressing protein synthesis and inducing apoptosis.
    T7 Peptide
  • HY-168333
    5-HT6 inverse agonist 1
    Inhibitor
    5-HT6 inverse agonist 1 (Compound 33) is an antagonist for 5-HT6 receptor with a Ki of 23 nM and a Kb of 6.62 nM. 5-HT6 inverse agonist 1 inhibits the 5-HT6R mediated Cdk5 and mTOR signaling pathway. 5-HT6 inverse agonist 1 reduces tactile hypersensitivity in spinal nerve ligation (SNL)-induced rat model.
    5-HT6 inverse agonist 1
  • HY-10116
    PI-540
    Inhibitor
    PI-540 is a bicyclic thienopyrimidine derivative and an orally active PI3K inhibitor. PI-540 has anti-cancer cell proliferation properties and high tissue distribution. PI-540 can inhibit different isoforms of PI3K, with IC50s of 10 nM (P110α), 3510 nM (P110β), 410 nM (P110δ), and 33110 nM (P110γ). PI-540 also inhibits mTOR (IC50: 61 nM) and DNA-PK (IC50: 525 nM).
    PI-540
  • HY-168919
    KRASG12C IN-16
    Inhibitor
    KRASG12C IN-16 (Compound SK-17) is a selective, covalent and an orally active KRASG12C inhibitor. KRASG12C IN-16 induces Apoptosis. KRASG12C IN-16 effectively prevents the activation of MAPK and PI3K/mTOR signaling pathways. KRASG12C IN-16 displays anti-tumor activity against pancreatic cancer.
    KRASG12C IN-16
  • HY-N0486S7
    L-Leucine-1-13C,15N
    Activator ≥98.0%
    L-Leucine-1-13C,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-1-<sup>13</sup>C,<sup>15</sup>N
  • HY-W765245
    Rapamycin-13C,d3-1
    Rapamycin-13C,d3-1 (Sirolimus-13C,d3-1) is the deuterium labeled and 13C-labeled Rapamycin (HY-10219). Rapamycin (Sirolimus; AY 22989) is a potent and specific mTOR inhibitor with an IC50 of 0.1 nM in HEK293 cells. Rapamycin binds to FKBP12 and specifically acts as an allosteric inhibitor of mTORC1. Rapamycin is an autophagy activator, an immunosuppressant.
    Rapamycin-<sup>13</sup>C,d<sub>3</sub>-1
  • HY-B0627S
    Metformin-d6
    Metformin-d6 (1,1-Dimethylbiguanide-d6) is a deuterated labeled Metformin (HY-B0627). Metformin inhibits the mitochondrial respiratory chain in the liver, leading to AMPK activation and enhancing insulin sensitivity, and can be used in the study of type 2 diabetes. Metformin also inhibits liver oxidative stress, nitrosative stress, inflammation, and apoptosis caused by liver ischemia/reperfusion injury. In addition, metformin regulates the expression of autophagy-related proteins by activating AMPK and inhibiting the mTOR signaling pathway, thereby inducing tumor cell autophagy and inhibiting the growth of renal cell carcinoma in vitro and in vivo.
    Metformin-d<sub>6</sub>
  • HY-153120
    PI3K/mTOR Inhibitor-13
    Inhibitor
    PI3K/mTOR Inhibitor-13 is an orally active dual inhibitor of phosphoinositol 3-kinase (PI3K) and mTOR kinase. PI3K/mTOR Inhibitor-13 has potential applications in sexual diseases, solid tumor and idiopathic pulmonary fibrosis (IPF).
    PI3K/mTOR Inhibitor-13
  • HY-N6950R
    Hederacolchiside A1 (Standard)
    Modulator
    Hederacolchiside A1 (Standard) is the analytical standard of Hederacolchiside A1. This product is intended for research and analytical applications. Hederacolchiside A1, isolated from Pulsatilla chinensis, suppresses proliferation of tumor cells by inducing apoptosis through modulating PI3K/Akt/mTOR signaling pathway. Hederacolchiside A1 has antischistosomal activity, affecting parasite viability both in vivo and in vitro.
    Hederacolchiside A1 (Standard)
  • HY-175220
    4-TCPA
    Inhibitor
    4-TCPA is a potent VEGFR2 inhibitor. 4-TCPA induces apoptosis and cell cycle arrest, likely through inhibition of VEGFR2 and EGFR signaling with additional effects on the mTOk pathway. 4-TCPA can inhibit the vitality and proliferation of various cancer cell lines. 4-TCPA can be used for the study of cancers such as lung cancer, breast cancer and leukemia.
    4-TCPA
  • HY-W019868
    1-O-Hexadecyl-2-O-acetyl-sn-glycerol
    Inhibitor
    1-O-Hexadecyl-2-O-acetyl-sn-glycerol is an alkyl acylglycerol that may activate the amino acid transport activity of the A-system and stimulate the absorption of methylaminoisobutyric acid (MeAIB). MeAIB inhibits mTOR phosphorylation, which may affect intestinal amino acid absorption and signal transduction.
    1-O-Hexadecyl-2-O-acetyl-sn-glycerol
  • HY-155211
    mTOR inhibitor-13
    Inhibitor
    mTOR inhibitor-13 (compound 9g), an aryl ureido compound, is a potent and selective mTOR inhibitor with an IC50 of 0.29 nM. mTOR inhibitor-13 also inhibits PI3K-α with an IC50 of 119 nM.
    mTOR inhibitor-13
  • HY-N0112S
    Dihydromyricetin-d4
    Inhibitor
    Dihydromyricetin-d4 (Ampelopsin-d4) is deuterium labeled Dihydromyricetin. Dihydromyricetin is a potent inhibitor with an IC50 of 48 μM on dihydropyrimidinase. Dihydromyricetin can activate autophagy through inhibiting mTOR signaling. Dihydromyricetin suppresses the formation of mTOR complexes (mTORC1/2). Dihydromyricetin is also a potent influenza RNA-dependent RNA polymerase inhibitor with an IC50 of 22 μM.
    Dihydromyricetin-d<sub>4</sub>
  • HY-10474R
    Torkinib (Standard)
    Inhibitor
    Torkinib (Standard) is the analytical standard of Torkinib. This product is intended for research and analytical applications. Torkinib (PP 242) is a selective and ATP-competitive mTOR inhibitor with an IC50 of 8 nM. PP242 inhibits both mTORC1 and mTORC2 with IC50s of 30 nM and 58 nM, respectively.
    Torkinib (Standard)
  • HY-10681R
    Gedatolisib (Standard)
    Inhibitor
    Gedatolisib (Standard) is the analytical standard of Gedatolisib. This product is intended for research and analytical applications. Gedatolisib (PKI-587) is a highly potent dual inhibitor of PI3Kα, PI3Kγ, and mTOR with IC50s of 0.4 nM, 5.4 nM and 1.6 nM, respectively. Gedatolisib is equally effective in both complexes of mTOR, mTORC1 and mTORC2.
    Gedatolisib (Standard)
  • HY-W114419
    Bisphenol C
    Inhibitor ≥98.0%
    Bisphenol C is an estrogen receptor-α (ERα) agonist and an ERβ antagonist, with IC50 values of 2.65 nM for ERα and 1.94 nM for ERβ. Bisphenol C is a material of manufacturing polyester polymers like polycarbonate, is widely used in daily items like water bottles, food packaging, textile and so on.
    Bisphenol C
  • HY-N15267
    Ovalitenone
    Inhibitor
    Ovalitenone is a flavonoid compound that can be isolated from the plant Millettia peguensis. It shows no cytotoxic effects on lung cancer H460 and A549 cells, but it significantly inhibits anchorage-independent growth, CSC-like phenotypes, colony formation, and the migration and invasion capabilities of cancer cells. Ovalitenone can significantly reduce the levels of N-cadherin, snail, and slug, while increasing E-cadherin, thus inhibiting the EMT pathway. Additionally, Ovalitenone suppresses the signaling pathways regulated by focal adhesion kinase (FAK), ATP-dependent tyrosine kinase (AKT), mammalian target of rapamycin (mTOR), and cell division cycle 42 (Cdc42).
    Ovalitenone
  • HY-13328R
    Sapanisertib (Standard)
    Inhibitor
    Sapanisertib (Standard) is the analytical standard of Sapanisertib. This product is intended for research and analytical applications. Sapanisertib (INK-128; MLN0128; TAK-228) is an orally available, ATP-dependent mTOR1/2 inhibitor with an IC50 of 1 nM for mTOR kinase.
    Sapanisertib (Standard)
  • HY-N0022R
    Isoacteoside (Standard)
    Inhibitor
    Isoacteoside (Standard) is the analytical standard of Isoacteoside. This product is intended for research and analytical applications. Isoacteoside is a natural product that can significantly inhibit the formation of glycation end products. Isoacteoside Standard regulates the AKT/PI3K/m-TOR/NF-κB signaling pathway, induces apoptosis in OVCAR-3 cell. Isoacteoside Standard exhibits antitumor, anti-inflammatory, anti-obesity and neuroprotective activities.
    Isoacteoside (Standard)
Cat. No. Product Name / Synonyms Application Reactivity

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.

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