Micronutrients at Supplemental Levels, Tight Junctions and Epithelial Barrier Function: A Narrative Review

Area of Science:

• Physiology
• Pathology
• Nutrition Science

Background:

• Epithelial barrier leak, driven by disease modifiers, is pivotal in disease morbidity.
• Breakdown of compartmentation contributes to severe outcomes, as seen with lung water accumulation in COVID-19.
• Micronutrients show potential in improving barrier function and reducing disease-related compromise.

Purpose of the Study:

• To propose a theory on how supra-dietary micronutrient levels remodel Tight Junctions (TJs) and enhance barrier function.
• To differentiate between dietary and supplemental micronutrient levels and their necessity in disease.
• To hypothesize why signal transduction requires higher supplemental doses for clinically beneficial barrier remodeling.

Main Methods:

• Narrative review of existing literature.
• Analysis of the role of micronutrients in epithelial barrier function.
• Exploration of TJ complex dynamics in disease pathophysiology.

Main Results:

• Disease modifiers induce epithelial barrier leak by altering TJs.
• Supplemental micronutrients, like Vitamin D, demonstrate clinical utility in conditions such as COVID-19.
• Higher supplemental micronutrient doses may be required for effective TJ remodeling and barrier repair.

Conclusions:

• Micronutrients can serve as a prophylactic and therapeutic option for diseases involving epithelial barrier dysfunction.
• Understanding the differential effects of dietary versus supplemental micronutrient levels is crucial for therapeutic applications.
• Further research into the mechanisms of micronutrient-mediated TJ remodeling is warranted.