Effect of experimental subarachnoid hemorrhage on calcium incorporation and adrenergic innervation of the cerebral arteries of the cat

J. Marín
F. Rivilla
M. Salaices
R.D. Lobato
J. Burgos
C.F. Sánchez-Ferrer
A. Fernández
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Abstract

The effect of experimental subarachnoid hemorrhage (SAH) on the adrenergic innervation and on the 45Ca2+ uptake of cat cerebral arteries was analyzed.Intracisternal injections of autologous blood reduced the noradrenaline content of perivascular nerve endings and 3H-noradrenaline uptake.These values returned to normal levels in a period of two weeks after SAH.The activity of dopamine-beta-hydroxylase was also reduced 3 and 7 days after SAH.Superior cervical gangliectomy and intracisternal injection of 6-hydroxydopamine also reduced these three parameters.The uptake of 45Ca2+ by arteries from animals submitted to SAH was greater than if the blood vessels were from untreated cats.Lantanum brought about a less 45Ca2+ displacement in the arterial segments from untreated animals than in those from cats after SAH.These results suggest that SAH induces a transient adrenergic denervation as well as changes in the membrane of smooth muscle cell which increase the quantity of Ca2+ bound to it.All these modifications might be involved in the cause of chronic cerebral vasospasm that appears after SAH.

Keywords:
Animals, Calcium/metabolism, Cats, Circle of Willis/innervation/metabolism, Dopamine beta-Hydroxylase/analysis, Female, Hydroxydopamines/pharmacology, Ischemic Attack, Male, Muscle, Nerve Endings/metabolism, Norepinephrine/metabolism, Oxidopamine, Smooth, Subarachnoid Hemorrhage/complications/metabolism/physiopathology, Sympathectomy, Transient/etiology/metabolism/physiopathology, Vascular/metabolism

Authors

J. Marín
F. Rivilla
M. Salaices
R.D. Lobato
J. Burgos
C.F. Sánchez-Ferrer
A. Fernández


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