Sucrose Solution Ingestion Exacerbates Dinitrofluorobenzene-Induced Allergic Contact Dermatitis in Rats.

Area of Science:

• Immunology
• Microbiology
• Nutritional Science

Background:

• Allergic dermatitis prevalence is increasing globally, linked to high-fat and high-sugar diets.
• While sucrose intake is associated with allergic diseases like asthma, its specific impact on allergic dermatitis remains under-researched.

Purpose of the Study:

• To investigate the effects of sucrose consumption on allergic contact dermatitis in a rat model.
• To explore the underlying mechanisms, including gut microbiota alterations and short-chain fatty acid (SCFA) levels.

Main Methods:

• Rats were administered sucrose solution for 14 days to assess allergic contact dermatitis induced by 2,4-dinitrofluorobenzene (DNFB).
• Gut microbiota composition, cecal and fecal SCFA levels, and blood SCFA concentrations were analyzed.
• Triacetin was administered with sucrose to evaluate its potential to counteract adverse effects.

Main Results:

• Sucrose intake led to early exacerbation of DNFB-induced allergic dermatitis symptoms and altered gut microbiota.
• Blood acetate levels significantly decreased, while cecal and fecal SCFA levels remained unaffected.
• Triacetin supplementation prevented the early exacerbation of symptoms, indicating a protective role.

Conclusions:

• Sucrose consumption can negatively impact allergic contact dermatitis by altering gut microbiota and reducing blood acetate levels.
• The mechanism involves reduced SCFA absorption due to decreased intestinal sodium concentration, mediated by sodium-glucose transporter 1 (SGLT1) upregulation.
• Targeting acetate levels or sodium transport may offer therapeutic strategies for managing sucrose-exacerbated allergic dermatitis.