Cited by 8Pharmacological Effects and AssaysDoping in SportsMuscle Physiology and Disorders

Testing anabolic activity, potency and mechanisms of action of the phyto-derived beta 2 agonist higenamine

Jiang, L., Piribauer, M., Kostov, T., Steidel, S., Bizjak, DA., Steinacker, JM., Parr, M., Diel, P.·2023·Toxicology Letters

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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Crossref · 10.1016/j.toxlet.2023.08.007

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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
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
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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