Anabasine — Neonicotine (Tobacco Pyridine-Piperidine Alkaloid · nAChR Agonist · Livestock Teratogen)
| Compound | Anabasine (Neonicotine) |
| Chemical class | Alkaloid — Pyridine / Piperidine (Tobacco minor alkaloid; 2-(3-pyridyl)piperidine) |
| CAS | 494-52-0 |
| Primary source | Nicotiana glauca (tree tobacco / South American tree tobacco); minor component in N. tabacum |
| Key applications | Nicotinic acetylcholine receptor agonist; insecticide research; livestock poisoning; informational reference |
| Claim strength | Moderate (pharmacological); Informational only (toxicological) |
| Typical form | Not a supplement ingredient; research compound; responsible for livestock tobacco plant poisoning |
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Name origin: From Anabasis aphylla (leafless anabasis, a Central Asian shrub from which anabasine was first isolated in 1934 by Orechoff). Also known as neonicotine — a name reflecting its structural similarity to nicotine. Anabasine is a (2S)-2-(3-pyridyl)piperidine — essentially nicotine’s pyrrolidine ring replaced by a piperidine ring. This structural difference gives anabasine slightly different nicotinic receptor pharmacology compared to nicotine. Traditional use: None for human therapeutic use — anabasine is of interest primarily as a pharmacological tool and a livestock toxicology concern. Nicotiana glauca (tree tobacco) is an invasive plant in California, Arizona, and the American Southwest (native to South America) that has caused multiple livestock poisoning events and rare human poisonings from mistaken consumption. Pharmacological properties: Anabasine is a nicotinic receptor agonist (nAChR, particularly α4β2 and α3β4) similar to nicotine. It is a teratogen in livestock at the doses achievable from tree tobacco consumption — causing congenital contracture (arthrogryposis) in calves, piglets, and other animals born to dams that grazed on N. glauca during pregnancy. This teratogenic mechanism is similar to coniine from hemlock. Toxicological significance: Anabasine is the most common toxic alkaloid in livestock anabasine poisoning from N. glauca. It is used as a forensic biomarker to distinguish N. glauca poisoning from nicotine poisoning (anabasine vs nicotine ratio indicates N. glauca vs tobacco exposure).
Anabasine — Pharmacological and Toxicological Context
Nicotinic receptor pharmacology: Anabasine activates the same nicotinic acetylcholine receptors as nicotine, producing similar physiological effects at equivalent doses (stimulation, tachycardia, nausea, vomiting). However, anabasine is generally considered slightly less potent than nicotine at α4β2 nAChRs and may have different α3β4 relative selectivity. Anabasine does not have significant addiction potential in controlled studies — the specific dopamine-releasing properties of nicotine at α4β2 are not fully replicated by anabasine. Pharmacological reference.
Teratogenicity — livestock concern: Anabasine (and related N. glauca alkaloids) are potent teratogens when cattle, sheep, or pigs consume tree tobacco during specific gestational windows (approximately 40–70 days in cattle). The mechanism involves nAChR activation in the developing fetus producing prolonged muscle contractions during critical periods of musculoskeletal development, leading to congenital contracture deformities (arthrogryposis). This is a significant veterinary and agricultural concern in regions where N. glauca is invasive. Veterinary toxicology reference.
Forensic marker for N. glauca exposure: Because N. glauca contains anabasine but not cotinine (the primary nicotine metabolite), urine or plasma anabasine quantification distinguishes N. glauca plant poisoning from nicotine/tobacco exposure. This forensic differentiation is important in veterinary toxicology (livestock poisoning investigations) and rare human poisoning cases. Forensic reference.
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Frequently Asked Questions — Anabasine
Why is tree tobacco (Nicotiana glauca) dangerous to livestock?
Nicotiana glauca (tree tobacco) is an invasive, weedy shrub that grows readily in disturbed soils in California, Arizona, and the Southwest US (introduced from South America). Unlike cultivated tobacco (N. tabacum), which livestock typically avoid due to its smell and taste, N. glauca is more palatable and may be consumed inadvertently in dry conditions when other forage is limited. Anabasine content is approximately 0.2–1% of dry weight — sufficient to cause teratogenicity or acute nicotinic toxicity if consumed in significant amounts.
How does anabasine teratogenicity differ from thalidomide?
Both cause limb deformities but via completely different mechanisms. Thalidomide inhibits angiogenesis and Wnt signalling in the developing limb bud, preventing limb bud outgrowth during critical early gestation (first trimester equivalent). Anabasine causes arthrogryposis — fixed joint contractures from muscle hypokinesia — during a later fetal developmental window when nAChR-mediated fetal movement is critical for normal joint development. The fetus develops normally but insufficient movement leads to joint ankylosis. Joints require movement to develop normal range of motion.
Is anabasine similar to the synthetic neonicotinoid insecticides?
There is a historical terminological connection — anabasine was called “neonicotine” early in its history, and the modern synthetic neonicotinoid insecticides (imidacloprid, clothianidin, thiamethoxam) were named to reflect their nicotine-like mechanism at insect nAChRs. However, anabasine and modern neonicotinoids are structurally different compounds. Modern neonicotinoids are synthetic and have high selectivity for insect vs mammalian nAChRs; anabasine is a natural alkaloid with mammalian nAChR activity. The bee toxicity concerns associated with neonicotinoid pesticides are not relevant to anabasine at environmental concentrations.
Can anabasine exposure be detected in routine drug screening?
Standard workplace urine drug screens do not test for anabasine — they test for cotinine (nicotine metabolite), not anabasine. Specific forensic or research testing for anabasine uses LC-MS/MS. Anabasine is sometimes found as a minor metabolite in smokers of certain tobacco products (due to its presence as a minor alkaloid in tobacco) and would not cause a false-positive for other controlled substances. Human anabasine exposure outside of tobacco/plant contact is extremely rare.
Related compounds: Nicotine, Lobeline, Coniine, Anatabine
Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.
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