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Spreading depression and the blood-brain barrier
Summary
Hypertonic solutions opening the blood-brain barrier did not block spreading cortical depression in rabbits. However, topical NaCl application blocked this brain activity without altering the blood-brain barrier.
Area of Science:
- Neuroscience
- Physiology
- Pharmacology
Background:
- Spreading cortical depression (SCD) is a wave of neuronal and glial depolarization.
- The blood-brain barrier (BBB) regulates substance passage into the brain.
- Understanding interactions between SCD and BBB is crucial for neurological research.
Purpose of the Study:
- To investigate the effect of opening the blood-brain barrier (BBB) on spreading cortical depression (SCD) propagation.
- To determine if hypertonic solutions affect SCD and BBB integrity.
- To explore topical application of NaCl's impact on SCD.
Main Methods:
- Studied SCD propagation in rabbits using voltage variations.
- Induced reversible BBB opening with hypertonic NaCl and sodium diatrizoate.
- Monitored BBB rupture via Evans blue-albumin leakage.
- Administered test substances via intracarotid injection or topical application.
Main Results:
- Intracarotid hypertonic solutions opening the BBB did not impede SCD propagation.
- Topical application of NaCl blocked SCD propagation without compromising BBB integrity.
- Recurrent SCD waves did not induce Evans blue-albumin complex release.
Conclusions:
- BBB opening by hypertonic solutions does not inhibit SCD.
- Topical NaCl can reversibly block SCD, suggesting localized mechanisms.
- SCD propagation itself does not appear to damage the BBB.