The sympathetic nervous system and atherosclerosis.

Area of Science:

• Cardiovascular Science
• Medical Research
• Pharmacology

Background:

• Atherosclerosis is a significant cardiovascular disease characterized by arterial wall changes.
• Diet-induced animal models are crucial for studying atherosclerosis progression and therapeutic interventions.
• The role of the sympathetic nervous system and beta-blockers in atherosclerosis is an area of ongoing research.

Purpose of the Study:

• To investigate the effects of thoracic sympathectomy and propranolol on diet-induced atherosclerosis in rhesus monkeys.
• To evaluate morphometric and chemical changes in major arterial vessels following treatment.
• To determine the efficacy of these interventions in specific arterial beds.

Main Methods:

• Rhesus monkeys were fed an atherogenic diet for 12 months to induce atherosclerosis.
• Treatment groups received either bilateral surgical thoracic sympathectomy or propranolol (40 mg/12 hrs).
• Control group received only the atherogenic diet. Morphometric and chemical analyses of arterial walls were performed.

Main Results:

• Surgical sympathectomy significantly reduced atherosclerosis progression in carotid arteries and moderately in the thoracic aorta.
• Propranolol showed a less dramatic but noticeable reduction in atherosclerosis in carotid arteries and thoracic aorta.
• No significant differences in atherosclerosis extent or chemical composition were observed in abdominal aorta or femoral arteries.

Conclusions:

• Thoracic sympathectomy and propranolol show potential in managing atherosclerosis in specific arterial segments.
• These interventions may be beneficial in controlling atherosclerosis under severe atherogenic conditions.
• Further research is warranted to explore the mechanisms and clinical applicability of sympathectomy and beta-blockers in atherosclerosis.