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Adiponectin (APN) reduces atherosclerosis by lowering oxidative stress and improving lipid profiles. This study shows APN increases antioxidant enzymes and reduces harmful cholesterol, protecting the aorta.

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Area of Science:

  • Cardiovascular Research
  • Metabolic Syndrome
  • Oxidative Stress Biology

Background:

  • Investigated the anti-atherosclerosis effects of adiponectin (APN).
  • Examined the relationship between APN and oxidative stress reduction.
  • Utilized high-fat diet-induced atherosclerosis models in apolipoprotein E-deficient (ApoE-/-) mice.

Purpose of the Study:

  • To determine if adiponectin's anti-atherosclerosis properties are linked to reduced oxidative stress.
  • To evaluate the impact of varying adiponectin gene expression levels on atherosclerosis development.

Main Methods:

  • 48 ApoE-/- mice were divided into control, high-fat diet, low-APN, and high-APN groups.
  • Adenovirus-mediated overexpression of adiponectin (Ad-APN) was administered at low (1.0×10⁸ p.f.u.) and high (5.0×10⁸ p.f.u.) doses.
  • Mice received high-fat diets for 8 weeks, with Ad-APN injections every 2 weeks.

Main Results:

  • Increased serum adiponectin correlated with higher superoxide dismutase (SOD) activity and lower malondialdehyde (MDA) levels.
  • Adiponectin treatment reduced total cholesterol (TC), triglyceride (TG), and LDL-C.
  • Aortic mRNA expression of endothelial nitric oxide synthase (eNOS) and adiponectin increased with APN levels, alongside reduced atherosclerotic lesion formation.

Conclusions:

  • Adiponectin protects the aorta from atherosclerosis by mitigating oxidative stress and reducing atherosclerotic lesions.
  • Key mechanisms include enhanced SOD activity, decreased MDA, and increased eNOS and adiponectin mRNA expression in the aorta.
  • Adiponectin therapy effectively lowers serum TC, TG, and LDL-C levels.