Opioid System Antagonism Alters Vascular Proteome and Collagen Deposition in ApoE−/− Mice

Atherosclerosis is common cardiovascular disease, leading to complications such as myocardial infarction and stroke. The main causes of these diseases are lipid accumulation and inflammation in large arteries. In this study, we investigated whether opioid receptor blockade impacts factors involved in atherosclerosis development. We administered naloxone to 8-week-old and 36-week-old ApoE^-/- mice, then examined the expression of <i>Col1a1</i>, and <i>Col3a1</i> in the aorta, as well as the influence of naloxone administration on aortic collagen layer thickness and proteomic changes in the aorta. Additionally, we assessed the impact of naloxone on the splenic T-cell populations. The results showed that <i>Col3a1</i> expression decreased in young mice but increased in older mice. In 36-week-old mice, naloxone administration led to an increase in aortic collagen layer thickness, but remained unchanged in young mice. Proteomic analysis identified 587 proteins that were altered following naloxone treatment. Our studies suggest that the opioid system is an important factor in atherosclerosis development.