Chronic unpredictable stress accelerates atherosclerosis through promoting inflammation in apolipoprotein E knockout...

Area of Science:

• Cardiovascular Science
• Immunology
• Stress Physiology

Background:

• Chronic unpredictable stress (CUS) is linked to accelerated atherosclerosis, but mechanisms remain unclear.
• Inflammation is a key factor in atherogenesis, suggesting a role for stress-induced inflammation.

Purpose of the Study:

• To investigate if stress-induced inflammation mediates CUS-promoted atherosclerotic disease.
• To analyze the impact of CUS on atherosclerotic plaque development and composition.

Main Methods:

• Utilized apolipoprotein E-deficient mice as a model for spontaneous atherosclerosis.
• Employed hematoxylin and eosin staining and immunohistochemistry to assess plaque characteristics.
• Measured levels of adhesion molecules (VCAM-1, ICAM-1), CRP, and IL-6.

Main Results:

• CUS treatment significantly promoted atherosclerotic lesion development, including plaque rupture and increased size.
• Observed increased macrophage and T cell infiltration, and decreased smooth muscle cell mass, indicating plaque instability.
• Found significantly elevated levels of VCAM-1, ICAM-1, CRP, and IL-6 in CUS-treated mice.

Conclusions:

• CUS accelerates atherosclerosis, at least partially, by enhancing inflammatory responses.
• Stress-induced inflammation plays a crucial role in the pathogenesis of CUS-promoted cardiovascular disease.