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Brain microvessels produce 12-hydroxyeicosatetraenoic acid
S A Moore1, P H Figard, A A Spector
1Department of Pathology, University of Iowa, Iowa City 52240.
Journal of Neurochemistry
|August 1, 1989
Summary
Brain microvessels produce 12-hydroxyeicosatetraenoic acid (12-HETE), primarily from endothelial cells. This metabolite may contribute to cerebrovascular dysfunction after brain injury.
Area of Science:
- Neuroscience
- Biochemistry
- Vascular Biology
Background:
- Cerebral microvessels are crucial for brain function and integrity.
- Arachidonic acid metabolites play significant roles in cerebrovascular regulation.
- The specific role of 12-hydroxyeicosatetraenoic acid (12-HETE) in the brain remains to be fully elucidated.
Purpose of the Study:
- To investigate the production of 12-hydroxyeicosatetraenoic acid (12-HETE) by cerebral microvessels.
- To identify the cellular source of 12-HETE within the brain microvasculature.
- To explore the potential role of 12-HETE in cerebrovascular dysfunction.
Main Methods:
- Incubation of isolated murine cerebral microvessels with arachidonic acid or calcium ionophore.
- Inhibition studies using cyclooxygenase and lipoxygenase inhibitors.
- Analysis of metabolites using gas chromatography-mass spectrometry.
- Differential analysis of 12-HETE production in capillary-rich versus arteriole-rich microvessel fractions.
Main Results:
- Cerebral microvessels produce a monohydroxyeicosatetraenoic acid identified as 12-HETE.
- 12-HETE production is mediated by lipoxygenase, not cyclooxygenase.
- Cerebral endothelial cells are the primary source of microvessel-derived 12-HETE.
- Capillary fractions produced significantly more 12-HETE than arteriole fractions.
Conclusions:
- Brain microvessels, particularly capillaries, synthesize 12-HETE.
- Cerebral endothelial cells are the main producers of 12-HETE in the brain microvasculature.
- Accumulation of 12-HETE following brain injury may contribute to blood-brain barrier and cerebrovascular dysfunction.