Related Experiment Videos
Hyposerotonin-induced nitric oxide supersensitivity in the cerebral microcirculation
A Srikiatkhachorn1, T Anuntasethakul, S Maneesri
1Departments of Physiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
Headache
|April 12, 2000
Summary
Low serotonin levels enhance the brain
Area of Science:
- Neuroscience
- Vascular Biology
- Pharmacology
Background:
- Migraine pathophysiology involves unclear mechanisms of nitric oxide (NO) supersensitivity.
- Alterations in the serotonin system are a potential contributing factor to NO supersensitivity.
Purpose of the Study:
- To investigate the relationship between hyposerotonin (low serotonin) and cranial microvascular responses to nitric oxide (NO).
Main Methods:
- Wistar rats were depleted of serotonin using para-chlorophenylalanine (PCPA).
- Nitric oxide-induced pial arteriolar vasodilation was assessed using glyceryl trinitrate (GTN) and intravital videomicroscopy.
- Ultrastructural changes in cerebral microvessels were examined via electron microscopy.
Main Results:
- Hyposerotonin rats exhibited significantly enhanced NO-induced pial arteriolar dilation compared to controls.
- Ultrastructural analysis revealed more pronounced pathological changes in cerebral microvessels of hyposerotonin rats following NO exposure.
Conclusions:
- A hyposerotoninergic state potentiates both physiological and pathological responses to NO in cranial microvessels.
- This finding suggests that low serotonin may contribute to NO supersensitivity observed in migraine patients.