Protective effects of omega-3 fatty acids in a blood-brain barrier-on-chip model and on postoperative delirium-like behaviour in mice.
Level 5 - mechanism / opinion, no new human data
Preclinical in vitro microfluidic model and mouse surgical experiment
PubMed 35778276 · doi:10.1016/j.bja.2022.05.025
What was done
Researchers developed a microfluidic blood-brain barrier (BBB) device using primary human cells to test the effects of a clinically available intravenous omega-3 fatty acid emulsion (Omegaven) on tight junction proteins, vascular cell adhesion molecule 1 (VCAM-1), BBB permeability, and astrocytic networks after interleukin-1β stimulation. In parallel, mice were administered 10 μl/g body weight intravenous omega-3 emulsion or saline 1 hour prior to orthopedic surgery, and evaluated for pericyte loss, perivascular macrophage activation, BBB opening, microglial activation, and inattention behavior.
What was found
The abstract reports no numerical values. It states that omega-3 fatty acids protected endothelial tight junctions, VCAM-1, and barrier permeability against interleukin-1β in the microfluidic model. In mice, preoperative omega-3 emulsion prevented surgery-induced pericyte loss, perivascular macrophage activation, BBB breakdown, microglial activation, and delirium-like inattention.
Why it matters
This work identifies pericyte and perivascular macrophage dysregulation as mechanisms in surgery-induced BBB disruption and provides preclinical proof-of-concept for intravenous omega-3 fatty acid prophylaxis to reduce postoperative neuroinflammation and delirium.
Limits
The study is entirely preclinical, relying on an in vitro human-cell device and a rodent model, which may not reproduce complex human perioperative pathology. No quantitative sample sizes, effect sizes, or statistical confidence intervals were reported in the abstract. Clinical efficacy in human surgical populations remains unmeasured.
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