Testing anabolic activity, potency and mechanisms of action of the phyto-derived beta 2 agonist higenamine
Abstract
Higenamine (Hige), a plant derived alkaloid is classified as β2 agonist by the World Anti-Doping Agency (WADA). However, pharmacologic mechanisms of its performance-enhancing activity have not been investigated so far. Therefore, we investigate the anabolic activity and associated molecular mechanisms of Hige in C2C12 myotubes. In differentiated C2C12 cells dose-dependent effects of Hige on myotube size were analyzed. The mRNA expression of genes involved in hypertrophy was measured. For mechanistic studies, β2-adrenoceptor (ADRB2), androgen receptor (AR), and estrogen receptor (ER) inhibitors and dexamethasone (Dexa) were co-incubated and myotube diameter was evaluated. The interaction of Hige with the AR and ER was investigated Hige treatment significantly increased myotube diameters and stimulated the mRNA expression of hypertrophy-involved genes. In contrast to the ADRB2 inhibitor (ICI 118551), the ER inhibitor ZK 191703, the AR inhibitor Flutamide (Flu), and treatment with Dexa were able to antagonize the Hige-induced increase of myotube diameter. Hige has antagonistic activity in the AR and ER yeast transactivation assay. Our results demonstrate that Hige induces anabolic effects in C2C12 cells but not via the ADRB2. There are indications for a cross talk between Hige and the AR and ER. Future studies are necessary to investigate the involved molecular mechanisms.
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The C2C12 cell line-based assay is well-established and has been used in numerous other studies.
“a well-established C2C12 cell line-based assay, that has been used in numerous other studies [7,21,66–68].”
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- Authors
- Jiang, L., Piribauer, M., Kostov, T., Steidel, S., Bizjak, D., Steinacker, J., Parr, M., & Diel, P.
- Affiliations
- German Sport University Cologne (DE)
- University Hospital Ulm (DE)
- Freie Universität Berlin (DE)
- Corresponding author
- Diel, P.
- Venue
- Toxicology Letters
- Publisher
- Elsevier BV
- Published
- 2023-08
- Volume
- 385
- Pages
- 21-28
- ISSN
- 0378-4274 (ISSN-L)
- OpenAlex
- W4386002938
- Semantic Scholar
- c2e98e95937921d039cb85984005186dcd90a598
- Cited by
- 8
- References
- 31
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 3 · 2023: 2
- FWCI
- 1.39
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Toxicology Letters (publishedVersion)
- PubMed (publishedVersion)
- Funders
- World Anti-Doping Agency (20C16PD)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Pharmacological Effects and Assays
- Social Sciences › Sociology and Political Science › Doping in Sports
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
- Keywords
- higenamine, beta2-adrenergic agonists, plant alkaloids, anabolic activity, muscle hypertrophy, C2C12 myotubes, androgen receptor, estrogen receptor, receptor cross-talk, performance-enhancing drugs, gene expression
- MeSH terms
- Alkaloids, RNA, Messenger, Tetrahydroisoquinolines, Androgen Receptor Antagonists
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