Dorsomorphin (Compound C): Precision AMPK and BMP Pathway Inhibition

Executive Summary: Dorsomorphin (Compound C) is a potent, cell-permeable ATP-competitive inhibitor of AMPK (Ki = 109 nM) with high selectivity over related kinases (Lee 2010, DOI). It suppresses downstream phosphorylation events such as ACC phosphorylation by ~80% in cell models (Zhou 2001, DOI). Dorsomorphin is also a BMP pathway inhibitor, blocking Smad 1/5/8 phosphorylation and reducing hepatic hepcidin transcription (Yu 2008, DOI). It is insoluble in water/ethanol, but highly soluble in DMSO (≥8.49 mg/mL, 25°C, with ultrasonication) (APExBIO). Common applications include AMPK inhibition in hepatocytes, HeLa, and HT-29 cells, autophagy studies, and zebrafish dorsalization assays (APExBIO; Ren et al. 2025).

Biological Rationale

AMP-activated protein kinase (AMPK) is a serine/threonine kinase that regulates cellular energy homeostasis and mitochondrial quality control (Hardie 2016, DOI). Aberrant AMPK signaling is implicated in metabolic disorders, cancer, and neurodegenerative diseases. Inhibition of AMPK, particularly in hepatocytes and cancer cells, is essential for dissecting metabolic regulation and autophagy (Ren et al. 2025, DOI). The BMP/Smad pathway governs developmental patterning, iron homeostasis, and cell fate decisions. Dorsomorphin, supplied by APExBIO as SKU B3252, enables targeted inhibition of both the AMPK and BMP/Smad signaling axes, supporting advanced research on metabolic, autophagic, and differentiation processes (APExBIO).

Mechanism of Action of Dorsomorphin (Compound C)

• ATP-competitive inhibition of AMPK: Dorsomorphin binds to the ATP-binding site of AMPK, competitively inhibiting its kinase activity (Ki = 109 nM, 25°C, HEPES buffer, pH 7.4) (Zhou 2001, DOI).
• Downstream effects: Inhibition of AMPK leads to decreased phosphorylation of acetyl-CoA carboxylase (ACC) by ~80% in cell-based assays (Zhou 2001, DOI).
• BMP/Smad inhibition: Dorsomorphin blocks BMP4-induced phosphorylation of Smad 1/5/8, reducing hepcidin gene transcription and increasing serum iron (Yu 2008, DOI).
• Autophagy modulation: AMPK inhibition suppresses autophagic proteolysis; in models of skeletal muscle atrophy, Dorsomorphin abrogates mitophagy induced by AMPK activators (Ren et al. 2025, DOI).

Evidence & Benchmarks

• Dorsomorphin inhibits AMPK with a Ki of 109 nM, demonstrating 50-fold selectivity over protein kinases A, C, and JAK3 (Zhou 2001, DOI).
• AMPK inhibition by Dorsomorphin reduces ACC phosphorylation by 80% in HepG2 cells at 10 μM, 2 h incubation (Zhou 2001, DOI).
• Dorsomorphin blocks BMP4-induced Smad 1/5/8 phosphorylation at 1 μM in human embryonic stem cells (Yu 2008, DOI).
• In zebrafish embryos, Dorsomorphin induces dorsalization at 2.5–10 μM (Yu 2008, DOI).
• In mouse skeletal muscle, Dorsomorphin (10 mg/kg, i.p.) reverses AMPK agonist-induced mitophagy (Ren et al. 2025, DOI).

This article extends prior reviews such as Dorsomorphin: Precision AMPK and BMP Pathway Inhibitor by detailing evidence from high-fat diet murine models and autophagy rescue not previously summarized. For advanced troubleshooting and cell-type-specific protocols, see APExBIO’s workflow guide, which this article updates with new application benchmarks.

Applications, Limits & Misconceptions

Dorsomorphin is used in:

• Inhibition of AMPK activity in hepatocytes, HeLa, and HT-29 cells for studies on metabolism, autophagy, and cell proliferation (Ren et al. 2025).
• Suppression of BMP/Smad signaling in human stem cell differentiation and iron metabolism (Yu 2008).
• Zebrafish dorsalization assays for developmental biology (Yu 2008).
• Animal models of iron overload and metabolic disorders (Ren et al. 2025).

Common Pitfalls or Misconceptions

• Dorsomorphin is not selective for AMPK at high concentrations (>10 μM); off-target effects on BMP and other kinases may occur (Yu 2008, DOI).
• It does not inhibit mTOR directly; observed effects on autophagy are mediated via AMPK (Zhou 2001, DOI).
• Dorsomorphin is insoluble in water and ethanol; improper solvents cause precipitation and loss of activity (APExBIO).
• Not recommended for long-term storage as solution; solutions should be freshly prepared in DMSO and used promptly (APExBIO).
• Effects on iron metabolism are indirect, via BMP/Smad inhibition and not via direct action on iron transporters (Yu 2008, DOI).

Workflow Integration & Parameters

• Solubilization: Dissolve in DMSO at ≥8.49 mg/mL, 25°C, with ultrasonication (APExBIO).
• Storage: Store as a solid at -20°C. Avoid prolonged solution storage.
• Working concentrations: 1–10 μM for cell-based assays; up to 10 mg/kg i.p. in mouse models (Ren et al. 2025, DOI).
• Controls: Use vehicle (DMSO)-treated samples and consider parallel kinase selectivity profiling for off-target assessment (Lee 2010, DOI).
• Applications: AMPK pathway dissection, BMP/Smad inhibition, autophagy modulation, and iron metabolism studies (APExBIO).

For protocol optimization and troubleshooting, refer to this workflow article, which provides additional reagent pairing and titration advice not covered here.

Conclusion & Outlook

Dorsomorphin (Compound C) enables precision control of AMPK and BMP/Smad signaling for studies in metabolism, autophagy, and cell differentiation. Its dual inhibition profile supports both mechanistic dissection and translational model development. Continued benchmarking and solvent compliance are critical for reproducible outcomes. Researchers are encouraged to use validated protocols and selectivity controls, as detailed in recent literature and APExBIO's product documentation (APExBIO).