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Metabolic Alterations Associated to Brain Dysfunction in Diabetes.

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  • 1Laboratory for Functional and Metabolic Imaging (LIFMET), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.

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Summary

Diabetes increases dementia risk, potentially through impaired glucose and insulin pathways affecting brain function. Animal models reveal how insulin resistance causes metabolic brain changes, detectable via magnetic resonance spectroscopy (MRS).

Keywords:
Alzheimer’s diseaseDiabetesInsulinMetabolismNeurodegeneration

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Area of Science:

  • Neuroscience
  • Metabolic Disorders
  • Endocrinology

Background:

  • Diabetes mellitus is linked to an increased risk of dementia, including Alzheimer's disease (AD).
  • Impaired glucose homeostasis and insulin signaling are observed in cognitive impairment and AD.
  • The precise mechanisms connecting insulin resistance and AD remain unclear.

Purpose of the Study:

  • To review the impact of diabetes and AD on brain structure and function.
  • To discuss translational findings from animal models linking insulin resistance to brain dysfunction.
  • To explore potential non-invasive biomarkers for early neurodegeneration.

Main Methods:

  • Review of epidemiological studies on diabetes and dementia risk.
  • Analysis of experimental models exhibiting diabetes-related brain phenotypes.
  • Discussion of translational research on insulin resistance and brain metabolism.

Main Results:

  • Diabetes affects brain structure and function through cerebrovascular complications, altered glucose/insulin signaling, and hypoglycemia.
  • Animal models demonstrate that insulin resistance leads to metabolic alterations underlying brain dysfunction.
  • These metabolic changes may occur early in neurodegeneration and alter neurochemical profiles.

Conclusions:

  • Insulin resistance in diabetes is mechanistically linked to brain dysfunction and neurodegeneration.
  • Metabolic brain modifications associated with diabetes are potential early biomarkers.
  • Magnetic resonance spectroscopy (MRS) may detect these metabolic alterations non-invasively.