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Increased Resting-State Functional Connectivity as a Compensatory Mechanism for Reduced Brain Volume in Prediabetes

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Type 2 diabetes mellitus (T2DM) is linked to reduced brain volume and altered functional connectivity. These brain changes may begin in prediabetes, with increased connectivity potentially compensating for volume loss.

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Radiology

Background:

  • Type 2 diabetes mellitus (T2DM) is a growing global health concern.
  • Diabetes and prediabetes are associated with cognitive impairment.
  • Understanding the neurobiological underpinnings of cognitive changes in T2DM is crucial.

Purpose of the Study:

  • To investigate how brain structure and function alterations contribute to cognitive function in individuals with normal glucose metabolism (NGM), prediabetes, and T2DM.
  • To examine the interactions between brain structure, function, and cognition in these groups.

Main Methods:

  • A population-based study involving 2,483 participants.
  • Structural and functional Magnetic Resonance Imaging (MRI) was used to assess brain volume and functional connectivity.
  • Multivariate linear regression models analyzed the associations between brain metrics and cognitive performance.

Main Results:

  • Participants with T2DM exhibited reduced brain volume and stronger thalamus-network functional connectivity compared to NGM.
  • Prediabetes was associated with localized brain volume reductions and altered thalamus-visual network connectivity.
  • Cognition correlated with greater right thalamus volume and lower right thalamus-visual network connectivity.

Conclusions:

  • Cognition in T2DM is associated with greater brain volume and reduced functional connectivity.
  • Increased functional connectivity in T2DM may represent a compensatory mechanism for diminished brain volume, potentially starting in the prediabetic stage.