Methamphetamine induces the release of endothelin

Area of Science:

• Neuroscience
• Pharmacology
• Vascular Biology

Background:

• Methamphetamine is a psychostimulant drug with high abuse potential.
• Methamphetamine abuse is linked to severe neurotoxicity and cerebrovascular events like stroke.
• Previous studies indicate methamphetamine causes vasoconstriction.

Purpose of the Study:

• To investigate the effect of methamphetamine on endothelin-1 (ET-1) release in mouse brain endothelial cells.
• To measure ET-1 transcription and endothelial nitric oxide synthase (eNOS) activation and transcription after methamphetamine treatment.
• To examine methamphetamine's effect on isolated mouse cerebral arterioles.

Main Methods:

• Enzyme-linked immunosorbent assay (ELISA) for ET-1 release.
• Measurement of ET-1 and eNOS transcription and activation.
• Micropipette system to assess vasoconstriction in isolated cerebral arterioles.

Main Results:

• Methamphetamine treatment increased ET-1 release and transiently upregulated ET-1 message in mouse brain endothelial cells.
• eNOS activity and transcription showed only slight enhancement after 24 hours of methamphetamine treatment.
• Methamphetamine induced significant vasoconstriction in isolated mouse intracerebral arterioles, which was attenuated by an endothelin receptor antagonist.

Conclusions:

• Methamphetamine-induced vasoconstriction in cerebral arterioles is mediated by the endothelin receptor.
• The findings suggest an endothelin-dependent pathway contributes to the vascular effects of methamphetamine.
• This research provides insight into the mechanisms underlying methamphetamine-associated cerebrovascular complications.