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Eclamptic plasma stimulates norepinephrine release in cultured sympathetic nerve
1Department of Obstetrics and Gynecology, Hamamatsu University School of Medicine, Hamamatsu City, Shizuoka, Japan.
Hypertension (Dallas, Tex. : 1979)
|June 11, 1998
Summary
Plasma from women with preeclampsia and eclampsia increases norepinephrine release from sympathetic nerves. Bupivacaine blocks this effect, suggesting potential therapeutic strategies for preeclampsia by reducing sympathetic nerve stimulation.
Area of Science:
- Neuroscience
- Obstetrics
- Pharmacology
Background:
- Preeclampsia and eclampsia are serious pregnancy complications associated with hypertension.
- Sympathetic nervous system overactivity is implicated in the pathophysiology of these conditions.
Purpose of the Study:
- To investigate the direct effect of plasma from preeclamptic and eclamptic patients on sympathetic nerve function.
- To assess the impact of bupivacaine on plasma-induced sympathetic nerve activity.
Main Methods:
- Cultured sympathetic neurons from chick embryos were exposed to plasma from various patient groups and controls.
- Norepinephrine release was quantified using high-performance liquid chromatography.
- Electron microscopy examined nerve cell morphology after stimulation and bupivacaine treatment.
Main Results:
- Plasma from eclamptic and preeclamptic women significantly elevated norepinephrine concentrations in a dose-dependent manner.
- Bupivacaine treatment significantly reduced norepinephrine secretion.
- Electron microscopy revealed plasma-induced neuronal changes consistent with excitotoxicity and bupivacaine-induced membrane damage.
Conclusions:
- Plasma from preeclamptic and eclamptic patients exerts an excitotoxic effect on sympathetic nerves, increasing norepinephrine release.
- Bupivacaine counteracts this effect, indicating potential for therapeutic intervention in preeclampsia by modulating sympathetic nerve activity.