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Effect of prostacyclin and adenosine triphosphate on vasospasm of canine basilar artery
Insights
Cerebral vasospasm, a complication of brain surgery or disease, can be worsened by adenosine triphosphate (ATP) but mitigated by prostacyclin. Combining prostacyclin and ATP prevented arterial wall degeneration in dogs.
Area of Science:
- Neuroscience
- Cardiovascular Biology
- Biochemistry
Background:
- Cerebral vasospasm significantly impacts morbidity and mortality after intracranial procedures or diseases.
- Platelet activation and aggregation in spastic vessels create a detrimental cycle, exacerbated by platelet degradation mediators.
- Healthy arteries counteract vasospasm by synthesizing prostacyclin, a key vasodilator and anti-aggregatory agent.
Purpose of the Study:
- To investigate the potential of increasing arterial prostacyclin and adenosine triphosphate (ATP) levels to counteract cerebral vasospasm.
- To evaluate the effects of intraarterial prostacyclin and ATP administration on vasospasm and arterial wall integrity in an animal model.
Main Methods:
- Induction of cerebral vasospasm in male dogs via autogenous blood injection into the cisterna magna.
- Intraarterial administration of prostacyclin and/or ATP during both acute and chronic vasospasm phases.
- Assessment of vasospasm severity, arterial wall degeneration, and basilar artery morphology using electron microscopy.
Main Results:
- Adenosine triphosphate (ATP) injection exacerbated vasospasm severity.
- Intraarterial prostacyclin administration initiated vasodilation but did not prevent arterial wall degeneration.
- Co-administration of ATP and prostacyclin prevented arterial wall degeneration, preserving normal basilar artery structure.
Conclusions:
- Prostacyclin plays a crucial role in vasodilation and preventing platelet aggregation, primarily through cyclic adenosine monophosphate (cAMP) pathways.
- While prostacyclin alone can alleviate vasospasm, its combination with ATP is essential for preventing arterial wall degeneration.
- This study highlights a potential therapeutic strategy for managing cerebral vasospasm by modulating prostacyclin and ATP levels to preserve vascular integrity.
Abstract:
Cerebral vasospasm is one of the most important factors influencing morbidity and mortality of intracranial operations or diseases. Platelet aggregation and adhesion is increased in spastic vessels. Degradation of platelets liberates mediators, which in turn increase vasospasm, thus creating a vicious cycle. Healthy vessels cope with this by increasing the synthesis of prostacyclin. The purpose of this study was to increase experimentally the levels of arterial prostacyclin and adenosine triphosphate (ATP) in animals through intraarterial injection of these substances because they are lower in spastic vessels. Prostacyclin promotes antiaggregation and dilatation, increases blood flow, inhibits thromboxane A2, and prevents synthesis of angiotensin II. Most of these effects were done by increasing cyclic adenosine monophosphate (cAMP). After injecting autogenous blood into the cisterna magna of male dogs, both the acute and chronic phases of vasospasm and the degenerative changes in the arterial wall were observed. Injecting ATP increased the severity of vasospasm. During vasospasm it was found that when prostacyclin is used intraarterially, vasodilatation began, but degeneration of the arterial wall could not be prevented. In the group of animals in which both ATP and prostacyclin were used, there was no degeneration of the arterial wall and the basilar artery was seen to be normal when viewed under the electron microscope.