Short-term effects of electronic cigarettes on cerebrovascular function: A time course study

Area of Science:

• Vascular Biology
• Neuroscience
• Toxicology

Background:

• Electronic cigarettes (Ecigs) are increasingly popular, but their effects on cerebral blood vessels are not well understood.
• Previous research indicates acute exposure to Ecigs can cause abnormal vascular responses in systemic arteries.
• The duration of these effects and the time required for recovery in cerebral vessels remain largely unknown.

Purpose of the Study:

• To investigate the impact of a single exposure to traditional cigarettes versus Ecigs on middle cerebral artery (MCA) reactivity in rats.
• To determine the time course for the recovery of MCA function following exposure to cigarettes and Ecigs.

Main Methods:

• Sprague-Dawley rats were exposed to air, traditional cigarettes, or Ecigs (varying puff counts).
• Middle cerebral artery (MCA) reactivity was assessed using myography at multiple time points post-exposure (1-4 hours, 24 hours, 48 hours, 72 hours).
• Endothelium-dependent and independent dilatation, as well as vasoconstriction, were measured.

Main Results:

• Both cigarette and Ecig exposure caused significant, similar impairment of endothelium-dependent MCA dilatation, with maximal effects observed within 24 hours.
• This impairment persisted for up to 3 days (72 hours) post-exposure for both groups.
• Endothelium-independent dilatation and serotonin-induced vasoconstriction showed less severe and shorter-lasting impairment, recovering by 48 hours.

Conclusions:

• A single exposure to traditional cigarettes or Ecigs induces comparable and prolonged cerebrovascular dysfunction, specifically affecting MCA endothelial function.
• The findings suggest that vaping, with or without nicotine, may pose similar vascular health risks to smoking.
• Nicotine may not be the primary driver of MCA dysfunction, implying other components in both traditional and e-cigarette aerosol contribute to vascular harm.