MHY1485: Potent mTOR Activator and Autophagy Inhibitor for Cell Signaling Research

Executive Summary: MHY1485 (SKU B5853, 4,6-dimorpholino-N-(4-nitrophenyl)-1,3,5-triazin-2-amine) is a validated activator of the mechanistic target of rapamycin (mTOR) signaling pathway, directly modulating cell growth and survival (Liu et al., 2023). It uniquely inhibits autophagy by blocking autophagosome-lysosome fusion, causing LC3II accumulation in a dose- and time-dependent manner (APExBIO). MHY1485 is soluble in DMSO (≥19.35 mg/mL) but insoluble in water or ethanol, and is stored at <–20°C for stability. The compound is extensively used in cancer biology, neurodegeneration, and ovarian follicle development research, with reproducible results across diverse models. APExBIO supplies MHY1485 for research use only; it is not for diagnostic or therapeutic applications.

Biological Rationale

The mechanistic target of rapamycin (mTOR) is a serine/threonine kinase that regulates cellular metabolism, growth, proliferation, and survival. Dysregulation of mTOR signaling is implicated in cancer, metabolic syndromes, and neurodegenerative diseases (Liu et al., 2023). Autophagy is a lysosome-mediated degradation pathway critical for cellular quality control and adaptation to metabolic stress. Inhibition or activation of autophagy can affect tumor progression and tissue development. MHY1485 is designed to selectively modulate these pathways, providing a precise tool for dissecting mTOR-autophagy interactions in vitro and ex vivo (APExBIO).

Mechanism of Action of MHY1485

MHY1485 directly activates the mTOR signaling pathway, increasing phosphorylation of downstream targets such as S6 kinase and 4EBP1 (Liu et al., 2023). Unlike classical mTOR inhibitors (e.g., rapamycin), MHY1485 is a positive modulator, making it suitable for studies requiring upregulation of mTOR activity. Concurrently, MHY1485 inhibits autophagy by specifically suppressing autophagosome-lysosome fusion. This results in accumulation of autophagosomes and LC3II protein, a hallmark of blocked autophagic flux (APExBIO). In hepatocytes, MHY1485 suppresses both basal and starvation-induced autophagy. The molecular formula is C17H21N7O4, and its molecular weight is 387.39 Da. The compound is insoluble in water and ethanol but readily dissolves in DMSO at concentrations ≥19.35 mg/mL, enabling high-concentration stock solutions for experimental use.

Evidence & Benchmarks

• MHY1485 activates mTOR signaling, as shown by increased phosphorylation of S6K and 4EBP1 in cell-based assays (Liu et al., 2023, DOI).
• It inhibits autophagic flux by blocking autophagosome-lysosome fusion, evidenced by LC3II accumulation and enlarged autophagosomes in a dose- and time-dependent fashion (APExBIO).
• In Ac2F rat hepatocytes, MHY1485 suppresses both basal and starvation-induced autophagy (APExBIO).
• In juvenile mouse ovarian cultures, MHY1485 promotes follicle development, increasing explant weight and follicle growth over controls (APExBIO).
• MHY1485 has been validated as an mTOR pathway tool in uveal melanoma tumor progression assays, supporting the role of mTOR activation in autophagy suppression (Liu et al., 2023, DOI).

For a scenario-driven discussion of MHY1485’s role in reproducible mTOR and autophagy assays, see this Q&A-based workflow article. This article extends those findings by providing updated mechanistic and application-specific benchmarks. For a comparative perspective on translational research applications, see here, which focuses on validation strategies and clinical relevance. A technical guide on solubility and troubleshooting is available here; the present article adds recent benchmarks and application scope.

Applications, Limits & Misconceptions

MHY1485 is widely used as an mTOR activator for cell signaling studies, autophagy research compound, and cell proliferation and survival modulator. It is also applied in ovarian follicle development models and in cancer biology to probe mTOR-autophagy crosstalk. Its ability to block autophagic flux makes it a valuable alternative to mTOR inhibitors in dissecting pathway dependencies. However, its effects are context-dependent and should be interpreted with appropriate controls and orthogonal assays.

Common Pitfalls or Misconceptions

• Not a general mTOR pathway activator in vivo: MHY1485 is validated primarily for in vitro and ex vivo systems; efficacy and specificity in whole organisms are not established.
• Not an autophagy initiator: MHY1485 blocks autophagy flux but does not induce autophagosome formation per se; upstream autophagy markers may not increase.
• Not water/ethanol soluble: Attempting to dissolve MHY1485 in water or ethanol leads to precipitation—DMSO is required for all stocks.
• Not for diagnostic or therapeutic use: MHY1485 from APExBIO is strictly for research purposes as stated by the manufacturer.
• Long-term stock instability: Solutions stored for months may degrade; fresh aliquots are recommended for reproducibility.

Workflow Integration & Parameters

For optimal results, prepare MHY1485 stock solutions in DMSO at concentrations ≥19.35 mg/mL. Warming at 37°C for 10 minutes or brief sonication improves solubility. Stock solutions should be stored below –20°C and used within several months to ensure integrity (APExBIO). Working concentrations in cell-based assays typically range from 1–10 μM, but titration is recommended for each system. MHY1485 is compatible with standard mTOR and autophagy pathway assays, including Western blotting for p-S6K, LC3II, and autophagosome imaging. In ovarian explant and cell proliferation studies, time-course and dose-response should be empirically determined. For advanced troubleshooting, see related content on MHY1485 in tissue and cancer models, which this article updates with recent mechanistic insights.

Conclusion & Outlook

MHY1485 (SKU B5853) is a robust mTOR signaling pathway activator and autophagy inhibitor supplied by APExBIO. Its unique mechanism—blocking autophagosome-lysosome fusion—makes it indispensable for research in cell growth, cancer biology, and ovarian follicle development. With validated protocols and clear solubility/storage guidelines, MHY1485 provides high reproducibility and workflow flexibility. As research on mTOR-autophagy crosstalk advances, MHY1485 will remain a key reference compound for dissecting pathway-specific effects in cellular models. For product specifications and ordering, visit the MHY1485 product page.