[Studies on brewer's yeast (II). Phlogistic action (author's transl)]

Area of Science:

• Pharmacology
• Immunology
• Biochemistry

Background:

• Brewer's yeast exhibits a phlogistic (inflammatory) effect.
• Understanding the mechanisms behind yeast-induced inflammation is crucial for developing targeted therapies.

Purpose of the Study:

• To investigate the inflammatory action of fractionated brewer's yeast samples in a rat model.
• To identify the specific yeast components responsible for the inflammatory response and the underlying mediators.

Main Methods:

• Subcutaneous injection of brewer's yeast fractions into rat hind paws.
• Dose-dependent edema measurement.
• Assessment of inhibition by anti-inflammatory drugs, anti-serotonin, and anti-histamine agents.
• Analysis of mannan's role as a key inflammatory component.

Main Results:

• Yeast samples, particularly those from cell wall destruction, induced significant, dose-dependent edema.
• The inflammatory effect was more potent than commercial yeast powder, peaking at 1 hour post-injection.
• Edema was partially inhibited by aspirin, aminopyrine, phenylbutazone, and indomethacin.
• Mannan induced similar swelling, primarily inhibited by cyproheptadine (anti-serotonin) but not diphenhydramine (anti-histamine).

Conclusions:

• Brewer's yeast cell wall components, especially mannan, trigger significant inflammatory responses.
• Serotonin release appears to be a key mediator in yeast-induced inflammation.
• The findings suggest a novel pathway for yeast-mediated inflammatory effects.