Vitamin D alleviates lipopolysaccharide‑induced acute lung injury via regulation of the renin‑angiotensin system.
Level 5 - mechanism / opinion, no new human data
Animal experiment (preclinical rodent model)
PubMed 28944831 · doi:10.3892/mmr.2017.7546
What was done
The authors investigated whether calcitriol (a vitamin D agonist) protects against lipopolysaccharide (LPS)-induced acute lung injury in rats. Calcitriol was administered as a pretreatment prior to LPS challenge. Lung permeability was evaluated via Evans blue dye extravasation, and expression of renin-angiotensin system (RAS) components—including renin, ACE, ACE2, and Ang II—was assessed using RT-qPCR, western blotting, and ELISA.
What was found
Calcitriol pretreatment significantly improved LPS-induced lung permeability and modulated the expression levels of ACE, ACE2, renin, and Ang II. The abstract does not provide any numerical values, effect sizes, variance estimates, or exact p-values.
Why it matters
The findings suggest that vitamin D pathways may mitigate acute lung injury partly by restoring balance to the pulmonary renin-angiotensin system. This provides a preclinical rationale for investigating vitamin D-related mechanisms in inflammatory lung damage.
Limits
This study was conducted exclusively in a rat model using LPS challenge, which does not capture the full complexity and etiology of human ARDS. The abstract does not report the sample size (n), dosages, or specific numerical data. Calcitriol was administered as a pretreatment, which limits clinical relevance to post-injury therapeutic applications.
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