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Mechanistic target of rapamycin (mTOR) inhibitors act on a kinase that links nutrient signals to cell growth. In 1994 mTOR was identified as the mammalian protein targeted by rapamycin bound to its receptor. The kinase forms a nutrient-sensitive complex with raptor, known as mTOR complex 1 (mTORC1), and a second complex, mTOR complex 2 (mTORC2). Sirolimus and its derivative everolimus act through FK506-binding protein 12 (FKBP12) and mainly inhibit mTORC1. Catalytic-site inhibitors such as Torin 1 and AZD8055 block both complexes. With Torin 1, rapamycin-resistant functions of mTORC1 were revealed in 2009. Dual phosphoinositide 3-kinase (PI3K)/mTOR inhibitors such as dactolisib are also listed here.
MHY1485 is a mTOR activator; inhibits the autophagic process by inhibition of fusion between autophagosomes and lysosomes leading to the accumulation of LC3II protein and enlarged autophagosomes.
Synonyms: CX-1632
Tulrampator (CX-1632) is an orally bioavailable positive AMPAR (allosteric modulator of AMPA receptor). Antidepressant.
3BDO is a new mTOR activator which can also inhibit autophagy.
Anticancer agent 235 is a modulator of the PI3K/AKT/mTOR signaling pathway. It promotes reactive oxygen species (ROS) generation and decreases mitochondrial membrane potential, leading to reduced proliferation of cancer cell lines including HCT116, Caco-2, AGS, and SMMC-772 with IC50 values ranging from 0.35 to 26.9 μM. Furthermore, Anticancer agent 235 effectively induces G2/M cell cycle arrest and apoptosis in HCT116 cells, making it a valuable tool for cancer research applications.
OSU-53 is an orally active AMPK activator and a direct mTOR inhibitor, exhibiting an EC50 of 0.3 μM. This compound induces autophagy by facilitating the conversion of LC3 I to LC3 II and plays a crucial role in modulating energy homeostasis by downregulating fatty acid biosynthesis while enhancing oxidative metabolism through upregulation of PGC1α and NRF-1. OSU-53 demonstrates antitumor activity across various cancer models, including breast and thyroid cancers, making it a valuable tool for cancer research and metabolic studies.
Synonyms: PTI-125 hydrochloride
Simufilam hydrochloride is an orally active modulator of filamin A (FLNA) that targets neuronal signaling pathways. This compound restores NMDAR signaling and Arc expression while inhibiting dysregulated mTOR activity. Additionally, it enhances insulin sensitivity and mitigates Aβ42-induced neuroinflammation and tau protein hyperphosphorylation. Simufilam hydrochloride is applicable in research related to Alzheimer's disease, particularly in understanding the underlying mechanisms of neurodegeneration.
Synonyms: PTI-125
Simufilam is an orally active modulator of filamin A (FLNA) that restores NMDA receptor (NMDAR) signaling and Arc expression. It effectively inhibits overactive mTOR signaling by restoring the normal conformation of FLNA, which results in improved insulin sensitivity and a reduction in Aβ42-induced neuroinflammation and tau protein hyperphosphorylation. This compound is particularly valuable for research applications focused on Alzheimer's disease and related neurodegenerative disorders.
Hydroxycitric acid is an orally active compound that serves as a multifunctional activator of Nrf2, AMPK, and mTOR pathways. It enhances the expression of antioxidant enzymes, such as superoxide dismutase, and increases glutathione levels, thereby mitigating oxidative stress and ferroptosis, particularly in renal tubular epithelial cells. Additionally, hydroxycitric acid induces cell cycle arrest in cancer cells and promotes DNA fragmentation through modulation of the AMPK and mTORC1/S6K signaling pathways. This compound is valuable for research in oxidative stress, cancer biology, and metabolic regulation.
Dioctanoylphosphatidic acid sodium acts as a modulator of the mammalian target of rapamycin (mTOR) signaling pathway. This compound enhances phagocyte respiratory burst, serves as a precursor for diacylglycerol and lysophosphatidic acid, and improves the viability of gallbladder carcinoma cells when used in conjunction with histone deacetylase inhibitors (HDACIs). Its unique biosynthetic origins from glycerophospholipid highlight its relevance in cellular signaling research and cancer studies.
Synonyms: NV-5138 hydrochloride
Mefluleucine hydrochloride is a selective and orally active activator of mTORC1, functioning primarily through its interaction with Sestrin2. This leucine analog plays a critical role in neurobiology and has been utilized in research studies focused on antidepressant mechanisms. Its distinct properties make it a valuable tool for investigating mTORC1 signaling pathways and their implications in mood disorders.
Hydroxycitric acid (tripotassium) is a potent activator of the Nrf2, AMPK, and mTOR signaling pathways. It enhances the expression of antioxidant enzymes, elevates glutathione levels, and inhibits ferroptosis, thereby providing protection against oxidative stress and promoting cellular health. This compound is actively engaged in regulating renal and pulmonary vascular functions and is also implicated in the induction of apoptosis in cancer cells through cell cycle arrest and DNA fragmentation. Its multi-target bioactivity makes it a valuable tool in research focused on oxidative stress, cancer biology, and metabolic regulation.
