Micronutrient Improvement of Epithelial Barrier Function in Various Disease States: A Case for Adjuvant Therapy.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing mechanistic and model data without systematic review methodology
PubMed 35328419 · doi:10.3390/ijms23062995
What was done
This narrative review synthesized published evidence from cell culture, animal, and human tissue models evaluating the effects of micronutrients—specifically zinc, vitamin A, and vitamin D—on epithelial barrier permeability, tight junction complex modulation, and disease states.
What was found
The abstract reports no numerical data or quantitative effect sizes. It qualitatively describes that zinc, vitamin A, and vitamin D, at concentrations exceeding recommended dietary allowances (RDA) but below toxicity thresholds, reduce epithelial barrier leakage by altering tight junction complexes in a cell- and tissue-specific manner, whereas micronutrient deficiencies worsen barrier leak.
Why it matters
Epithelial barrier disruption contributes to morbidity across multiple acute and chronic conditions; targeted supranutritional dosing of specific micronutrients could serve as a low-risk adjuvant therapy in critical care and infectious illnesses.
Limits
The abstract provides no quantitative outcomes, specific dosing regimens, or sample sizes. The conclusions rely heavily on in vitro and animal models rather than randomized clinical outcome trials, and the review lacks systematic methodology.
Cited by
- supports Significant zinc deficiency leads to a breakdown or loss of tight junctions in the intestinal lining.