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Visceral adipose tissue from obese or diabetic mice worsens Alzheimer's disease (AD) tau pathology. This exacerbation is linked to immune system activation, suggesting visceral fat as a therapeutic target for AD.

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Area of Science:

  • Neuroscience
  • Metabolic Disease Research
  • Immunology

Background:

  • Alzheimer's disease (AD) involves complex mechanisms, with metabolic alterations increasingly implicated in its progression.
  • Diabetes and obesity are known risk factors for AD, linked to expanded visceral adipose tissue.
  • Visceral adipose tissue may mediate the connection between peripheral metabolic dysfunction and brain disorders.

Purpose of the Study:

  • To investigate the role of visceral adipose tissue in mediating metabolic dysfunction and Alzheimer's disease pathology.
  • To determine if visceral adipose tissue from metabolically compromised states exacerbates tau pathology and neuroinflammation in AD models.

Main Methods:

  • Analysis of visceral adipose tissue from wild-type (WT), db/db (genetically obese/diabetic), and high-fat diet (HFD)-fed WT mice using histological and biochemical methods.
  • Adipose tissue transplantation experiments: db/db fat into 3xTg-AD mice and HFD-fed WT fat into Tau P301S mice.
  • Evaluation of tau pathology, p25/p35 expression, IL-1β levels, and microglial activation.

Main Results:

  • Transplantation of visceral fat from db/db donors significantly increased tau pathology in 3xTg-AD mice, associated with elevated p25/p35, IL-1β, and microglial activation.
  • Similarly, fat from HFD-fed WT donors exacerbated tau pathology and neuroinflammation in Tau P301S mice.
  • These findings indicate that metabolic dysfunction in visceral adipose tissue drives neuroinflammation and worsens tau pathology.

Conclusions:

  • Visceral adipose tissue from metabolically compromised (obese/diabetic or diet-induced obese) mice exacerbates tau pathology in AD models.
  • This exacerbation occurs through immune system activation, highlighting a novel interplay between metabolic disorders and AD.
  • Visceral adipose tissue emerges as a potential therapeutic target for mitigating AD progression.