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Cholinergic agonists or cholinomimetics mimic the action of acetylcholine to stimulate the parasympathetic nervous system. They are categorized into direct-acting and indirect-acting agents. The direct-acting cholinergic drugs induce the parasympathetic response by directly binding to the muscarinic or nicotine receptors. In comparison, the indirect-acting cholinergic drugs prevent acetylcholine hydrolysis, indirectly contributing to the extended parasympathetic response.
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Cholinergic properties of soy.

Annina Roeytenberg¹, Tzeela Cohen, Herbert R Freund

¹Department of Surgery, Hadassah University Hospital, Mount Scopus, Jerusalem, Israel.

Nutrition (Burbank, Los Angeles County, Calif.)

|July 17, 2007

Summary

Aqueous soy extract contains an acetylcholine-like substance that activates muscarinic receptors in the gut. This discovery offers new insights into the health benefits of soy consumption and warrants further investigation.

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Area of Science:

Pharmacology
Nutritional Science
Gastroenterology

Background:

Soybeans are recognized for their health benefits, but the specific mechanisms remain unclear.
Understanding the pharmacologic properties of soy components is crucial for elucidating its physiological effects.

Purpose of the Study:

To characterize the pharmacologic properties of active compounds within aqueous soy extract.
To investigate the mechanism of action of soy extract on smooth muscle contraction.

Main Methods:

Isolated guinea-pig ileum was used in an organ bath to measure mechanical activity.
The effects of soy extract were assessed in the presence of receptor antagonists (tetrodotoxin, atropine, M3 and M2 antagonists) and enzyme inhibitors.

Main Results:

Soy extract induced concentration-dependent contractions of the guinea-pig ileum.
The response was mediated via muscarinic receptors, as it was blocked by atropine but not tetrodotoxin.
Acetylcholine esterase inhibitors potentiated the extract's effect, while preincubation with acetylcholinesterase reduced it, suggesting an acetylcholine-like substance.

Conclusions:

Aqueous soy extract contains a substance that mimics acetylcholine's action on muscarinic receptors.
The presence of this cholinergic substance in soy may contribute to its known health benefits.
Further research is needed to explore the role of this soy-derived cholinergic agent in various physiological systems.