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Investigation of postmortem functional changes in human cerebral arteries
1Department of Neurosurgery, Jikei University School of Medicine, Tokyo, Japan.
Summary
Human cerebral arteries remain viable for 12 hours postmortem for studying smooth muscle and endothelial reactivity. Postmortem, endothelium-dependent relaxation is lost, while smooth muscle responses remain stable.
Area of Science:
- Vascular biology
- Pharmacology
- Postmortem physiology
Background:
- Understanding postmortem changes in vascular tissue is crucial for accurate pharmacological research.
- Human cerebral arteries are vital for studying cerebrovascular diseases and drug responses.
Purpose of the Study:
- To investigate the time-dependent changes in the reactivity of isolated human middle cerebral artery strips to vasodilators postmortem.
- To determine the viability of human cerebral arteries for smooth muscle and endothelial function studies within a specific postmortem window.
Main Methods:
- Isolated human middle cerebral artery strips were used to assess responses to vasodilators.
- Reactivity to prostaglandin (PG) I2, nitroglycerin, substance P, and bradykinin was measured over time postmortem.
- Endothelium-dependent and independent relaxations were evaluated.
Main Results:
- Relaxation induced by prostaglandin (PG) I2 or nitroglycerin remained stable for up to 24 hours postmortem.
- Endothelium-dependent relaxation to substance P and bradykinin was significantly impaired in arterial strips obtained more than 12 hours postmortem.
- Endothelium-independent smooth muscle responses were better preserved postmortem compared to endothelium-dependent responses.
Conclusions:
- The vascular endothelium in human cerebral arteries exhibits selective vulnerability to postmortem degradation compared to smooth muscle vasodilator mechanisms.
- Human cerebral arteries isolated within 12 hours postmortem are suitable for comprehensive studies of both smooth muscle and endothelial reactivity to vasodilators.