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Insulin expression in cultured astrocytes and the decrease by amyloid β.

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Astrocytes produce and secrete insulin, a process disrupted by Alzheimer's disease factors like amyloid beta. This discovery offers new insights into brain insulin signaling and Alzheimer's disease mechanisms.

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Cell Biology

Background:

  • Brain insulin resistance is linked to Alzheimer's disease (AD), affecting neuronal function and contributing to tau pathology.
  • While neuronal insulin signaling is studied, the role of astrocytes in brain insulin production remains unclear.

Purpose of the Study:

  • To investigate whether astrocytes express and secrete insulin.
  • To examine the impact of amyloid beta (Aβ) and lipopolysaccharide (LPS) on insulin expression in astrocytes.

Main Methods:

  • Primary astrocyte cultures from rat embryonic brains were used.
  • Insulin expression (mRNA and protein) was assessed under basal conditions and after Aβ or LPS treatment.
  • The effect of antioxidants (glutathione, N-acetylcysteine) was evaluated.
  • Insulin levels in conditioned medium were measured.

Main Results:

  • Astrocytes were found to express preproinsulin mRNA and insulin protein.
  • Aβ and LPS significantly decreased insulin mRNA and protein expression in astrocytes.
  • Antioxidants restored insulin mRNA expression suppressed by Aβ and LPS.
  • Insulin protein was detected in the astrocyte-conditioned medium, indicating secretion.

Conclusions:

  • Astrocytes express, synthesize, and secrete insulin.
  • Amyloid beta and LPS reduce insulin expression in astrocytes, potentially via oxidative stress.
  • Reduced astrocyte-derived insulin may represent a novel mechanism contributing to brain insulin signaling deficits in Alzheimer's disease.