Nicotine in Senescence and Atherosclerosis

Area of Science:

• Cardiovascular Science
• Toxicology
• Cellular Biology

Background:

• Cigarette smoke exacerbates age-related cardiovascular diseases (CVD), including atherosclerosis and cellular senescence.
• The specific roles of nicotine and its metabolite, cotinine, in these cardiovascular effects remain unclear.
• Increasing use of nicotine aerosols necessitates understanding their cardiovascular impact, which is often overlooked in favor of lung effects.

Purpose of the Study:

• To review the scientific literature and hypothesize the role of nicotine in cigarette smoke-induced cardiovascular damage.
• To investigate the mechanisms by which nicotine may contribute to atherosclerosis.
• To assess the public health implications of nicotine and cotinine exposure via aerosols.

Main Methods:

• Critical review of existing scientific literature on nicotine, cotinine, cigarette smoke, and cardiovascular pathologies.
• Analysis of proposed molecular pathways including MAPK signaling, inflammation, and oxidative stress.
• Evaluation of the role of NADPH oxidase 1 (Nox1) in nicotine-mediated effects.

Main Results:

• Nicotine is hypothesized to mediate cardiovascular effects of cigarette smoke by activating MAPK signaling, inflammation, and oxidative stress via Nox1.
• This process is proposed to induce senescence in vascular smooth muscle cells (VSMCs).
• Accumulation of senescent VSMCs in atherosclerotic lesions may promote plaque instability and disease progression.

Conclusions:

• Nicotine, and likely cotinine, adversely influences atherosclerosis development and progression.
• Nicotine-induced VSMC senescence is a key mechanism contributing to cardiovascular pathology.
• Further research is warranted to fully elucidate the cardiovascular risks associated with nicotine and cotinine exposure.