The Connection between Urinary Equol Levels and the Prevalence of Atopic Dermatitis

Area of Science:

• Dermatology
• Metabolomics
• Nutrition Science

Background:

• Soy isoflavones and equol are linked to reduced risks of hormone-sensitive tumors and metabolic syndromes.
• Investigating equol and soy isoflavone levels in atopic dermatitis is crucial due to their potential health impacts.
• Previous research has not explored the association between atopic dermatitis and specific soy isoflavone metabolites like equol.

Purpose of the Study:

• To compare urinary daidzein, genistein, and equol levels in atopic dermatitis patients versus healthy controls.
• To investigate the correlation between equol concentration and the severity of clinical symptoms in atopic dermatitis.
• To elucidate the role of soy isoflavone metabolites in atopic dermatitis pathogenesis.

Main Methods:

• Cross-sectional study conducted at Akita University Hospital and Aso Iizuka Hospital, Japan.
• Recruited 50 patients with atopic dermatitis and 67 healthy controls.
• Quantified urinary daidzein, genistein, and equol using high-performance liquid chromatography-mass spectrometry.

Main Results:

• Significantly lower urinary equol levels were observed in atopic dermatitis patients compared to healthy controls (p = 0.002).
• This difference was especially pronounced in young individuals aged 6-19 years (p < 0.001).
• No significant correlations were found between urinary equol levels and clinical symptom severity or laboratory data in atopic dermatitis patients.

Conclusions:

• Lower equol levels in childhood may be implicated in the development of atopic dermatitis.
• Equol deficiency could be a contributing factor to atopic dermatitis pathogenesis.
• Further research is warranted to confirm the role of equol in atopic dermatitis.