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Systemic arterial hypertension (SAH) causes changes in astrocyte morphology and function in rat hippocampus, potentially contributing to cognitive decline and Alzheimer's disease.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Pathology

Background:

  • Systemic arterial hypertension (SAH) is a global health issue linked to cognitive decline and Alzheimer's disease.
  • Hypertension affects brain cell morphology, particularly in the hippocampus.
  • Astrocytes play a crucial role in neuronal function and glutamate regulation.

Purpose of the Study:

  • Investigate morphological and functional changes in hippocampal astrocytes in spontaneously hypertensive rats (SHR).
  • Examine the effects of guanosine on astrocyte alterations in both acute and organotypic slice cultures.
  • Determine the role of astrocytic dysfunction in SAH-related cognitive impairment.

Main Methods:

  • Utilized acute and organotypic hippocampal slice cultures from SHR and Wistar Kyoto (WKY) rats.
  • Analyzed astrocyte morphology using GFAP immunofluorescence and modified Sholl analysis.
  • Assessed astrocyte numbers via flow cytometry and measured glutamate uptake.

Main Results:

  • SHR exhibited region-dependent decreases in astrocytic process size and branching in acute slices.
  • Organotypic slices showed reduced astrocyte numbers in WKY rats and impaired glutamate uptake in both SHR and WKY rats.
  • Guano sine treatment did not significantly alter observed astrocytic changes or glutamate uptake.

Conclusions:

  • SHR display specific astrocytic morphological alterations.
  • Both SHR and WKY rats exhibit reduced astrocyte numbers and impaired glutamate uptake in organotypic cultures.
  • Astrocytic dysfunction in SAH may contribute to cognitive decline and Alzheimer's disease pathogenesis.