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Neonatal pre-ganglionic sympathectomy affects morphometrically defined architecture in rat cerebral arteries
J Kåhrström1, J E Hardebo, C Nordborg
1Department of Medical Cell Research, University of Lund, Sweden.
Acta Physiologica Scandinavica
|June 1, 1996
Summary
Sympathetic nerve activity, not trophic influence, shapes cerebral vasculature long-term. Denervation in young rats altered artery dimensions, suggesting nerve activity is key to vascular development and structure.
Area of Science:
- Neuroscience
- Vascular Biology
- Developmental Biology
Background:
- The sympathetic nervous system plays a role in regulating blood vessels.
- Long-term effects of sympathetic nerves on cerebral vasculature are not fully understood.
Purpose of the Study:
- To investigate the long-term influence of sympathetic nerves on cerebral vasculature in developing rats.
Main Methods:
- Bilateral cervical pre-ganglionic denervation was performed in 1-week-old rats.
- Morphometric analysis of cerebral arteries (middle cerebral, posterior cerebral, basilar) was conducted 4 weeks post-denervation.
- Vascular dimensions, including media cross-sectional area, luminal radius, and internal elastic membrane area, were measured.
Main Results:
- Diminished media cross-sectional areas and luminal radii were observed in the middle cerebral and posterior cerebral arteries.
- These parameters remained unaffected in the basilar artery.
- A significant 40% increase in the internal elastic membrane cross-sectional area was noted in the basilar artery.
- No evidence of re-innervation was found.
Conclusions:
- Long-term effects of sympathetic nerves on cerebral vasculature appear to be linked to nerve activity.
- The findings suggest that sympathetic nerve activity, rather than a direct trophic influence, modulates vascular development and structure.