Aerobic exercise reverses arterial inflammation with aging in mice

Area of Science:

• Cardiovascular Science
• Aging Research
• Exercise Physiology

Background:

• Aging is associated with increased arterial inflammation and vascular dysfunction.
• Proinflammatory pathways, including NF-κB activation and elevated cytokines, contribute to age-related vascular changes.
• Macrophage infiltration in the arterial wall is implicated in age-related inflammation.

Purpose of the Study:

• To investigate whether regular aerobic exercise can reverse arterial inflammation and vascular dysfunction in aging mice.
• To determine the effects of late-life exercise on specific inflammatory markers and vascular function.

Main Methods:

• Compared young and old male mice, assessing aortic NF-κB activation, cytokine expression (IL-1, IL-6, IFN-γ, TNF-α), and immune cell infiltration.
• Evaluated vascular function via nitric oxide-mediated endothelium-dependent dilation.
• Assessed the impact of voluntary wheel running (10-14 weeks) on these parameters in old mice.

Main Results:

• Old mice exhibited increased aortic NF-κB activation, higher levels of proinflammatory cytokines, and greater macrophage/T lymphocyte infiltration in the adventitia and perivascular fat compared to young mice.
• This proinflammatory state in old mice was linked to impaired vascular function.
• Voluntary wheel running in old mice normalized NF-κB activation, cytokine expression, immune cell infiltration, and restored vascular function.

Conclusions:

• Regular aerobic exercise initiated late in life can reverse arterial inflammation and vascular dysfunction in aging mice.
• Exercise-induced anti-inflammatory effects may occur through "outside-in" mechanisms.
• Aerobic exercise holds significant potential for ameliorating age-associated vascular decline.