Etanercept Prevents Endothelial Dysfunction in Cafeteria Diet-Fed Rats.

Area of Science:

• Cardiovascular Research
• Obesity Research
• Inflammation Studies

Background:

• Obesity is linked to endothelial dysfunction, potentially mediated by inflammation.
• Tumor necrosis factor-alpha (TNF-α) plays a role in this inflammatory process.

Purpose of the Study:

• To investigate the effects of etanercept, a TNF-α inhibitor, on vascular function in a diet-induced obesity rat model.
• To assess etanercept's impact on endothelial nitric oxide synthase (eNOS) and TNF-α levels.

Main Methods:

• Male Wistar rats were fed a standard or cafeteria diet (CD) for 12 weeks, with etanercept administered during CD treatment.
• Isometric tension recordings of isolated aortas were performed.
• Body weight, serum and aortic TNF-α, and eNOS immunoreactivity were measured.

Main Results:

• Cafeteria diet impaired endothelium-dependent relaxations, which were improved by etanercept.
• eNOS expression decreased in CD-fed rats but normalized with etanercept treatment.
• Both serum and aortic TNF-α levels were elevated by CD and reduced by etanercept.
• Etanercept treatment led to reduced weight gain in CD-fed rats.

Conclusions:

• Etanercept ameliorates diet-induced endothelial dysfunction and vascular reactivity impairments.
• Inhibition of TNF-α by etanercept may be a therapeutic strategy for obesity-related vascular complications.
• Etanercept also demonstrates potential in managing diet-induced weight gain.