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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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APOE Stabilization by Exercise Prevents Aging Neurovascular Dysfunction and Complement Induction.

Ileana Soto1, Leah C Graham2, Hannah J Richter1

  • 1The Jackson Laboratory, Bar Harbor, Maine, United States of America.

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|October 30, 2015
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Aging harms brain blood vessels and increases inflammation, but exercise can help. This benefit requires APOE protein, crucial for brain health and reducing inflammation in aging mice.

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Area of Science:

  • Neuroscience
  • Aging Research
  • Neuroimmunology

Background:

  • Aging is a primary risk factor for neurodegenerative diseases like Alzheimer's.
  • The mechanisms behind age-related brain structure and function decline are not fully understood.

Purpose of the Study:

  • To investigate the impact of aging on neurovascular structures and neuroinflammation.
  • To determine if aerobic exercise can mitigate age-related neurovascular decline and neuroinflammation.
  • To explore the role of Apolipoprotein E (APOE) in these processes.

Main Methods:

  • RNA sequencing and high-resolution histological analysis in aged mice.
  • Assessment of neurovascular integrity, including basement membrane, pericytes, and astrocytes.
  • Evaluation of neuroinflammation markers (C1QA) in microglia/monocytes.
  • Behavioral testing and synaptic plasticity measurements.
  • Comparative studies using APOE-deficient mice.

Main Results:

  • Aging significantly deteriorates neurovascular structures, leading to vascular leakage and increased neuroinflammation (C1QA+ microglia/monocytes).
  • Long-term aerobic exercise prevented neurovascular decline, reduced C1QA+ microglia/monocytes, and improved synaptic plasticity and behavior in aged mice.
  • Exercise prevented the age-related decrease in astrocytic APOE, which is essential for neurovascular health and anti-inflammatory effects.
  • Exercise benefits were absent in APOE-deficient mice, highlighting APOE's critical role.

Conclusions:

  • Age-related neurovascular decline is linked to complement activation in microglia/monocytes.
  • Aerobic exercise can prevent these age-related changes, but only in the presence of APOE.
  • APOE is crucial for mediating the protective effects of exercise against neurovascular dysfunction and neuroinflammation in aging.