Social status, environment, and atherosclerosis in cynomolgus monkeys

Area of Science:

• Cardiovascular Science
• Behavioral Biology
• Primate Research

Background:

• Social hierarchy and stress are implicated in cardiovascular disease.
• Understanding the interplay between social dynamics and atherosclerosis is crucial.

Purpose of the Study:

• To investigate the impact of social environment and status on atherosclerosis in male cynomolgus monkeys.
• To determine if social instability exacerbates atherosclerosis in dominant individuals.

Main Methods:

• Adult male cynomolgus monkeys were fed an atherogenic diet for 22 months.
• Monkeys were housed in stable or unstable social conditions, with dominant and subordinate classifications.
• Coronary arteries and aortas were analyzed for atherosclerosis (atherosclerosis).

Main Results:

• Dominant monkeys in unstable social conditions showed significantly higher coronary artery atherosclerosis than stable dominants.
• Unstable dominants also had more atherosclerosis than unstable subordinates.
• Atherosclerosis patterns in the abdominal aorta were similar but not significant; thoracic aorta showed no differences.

Conclusions:

• Social dominance is linked to increased coronary artery atherosclerosis, particularly under conditions of social instability and status challenge.
• Behavioral changes, including intensified aggression and disrupted affiliation, accompanied social instability.
• Findings suggest social dynamics significantly influence cardiovascular health outcomes in primates.