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Synaptic dysfunction in progranulin-deficient mice.

Terri L Petkau1, Scott J Neal, Austen Milnerwood

  • 1Centre for Molecular Medicine & Therapeutics, Department of Medical Genetics, University of British Columbia, and Children's and Women's Hospital, 980 West 28th Avenue, Vancouver, BC, Canada V5Z 4H4.

Neurobiology of Disease
|November 9, 2011
PubMed
Summary
This summary is machine-generated.

Progranulin deficiency in mice causes behavioral and synaptic changes, impacting brain function before overt pathology. This research sheds light on the role of progranulin in frontotemporal dementia (FTD).

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Area of Science:

  • Neuroscience
  • Genetics
  • Neurology

Background:

  • Progranulin haploinsufficiency is a known cause of familial frontotemporal dementia (FTD).
  • The precise function of progranulin within the central nervous system (CNS) remains incompletely understood.

Purpose of the Study:

  • To investigate the in vivo role of murine progranulin (Grn) in the CNS.
  • To characterize the behavioral, synaptic, and morphological consequences of progranulin deficiency.

Main Methods:

  • Generation of constitutive progranulin knockout mice (GrnKO) using a gene-trap vector.
  • Behavioral testing (anxiety, social interaction, motor coordination, novel object recognition).
  • Electrophysiological analysis of synaptic transmission and plasticity in hippocampal CA1 region.
  • Morphological analysis of pyramidal cell dendrites and spine density.

Main Results:

  • GrnKO mice exhibited moderate behavioral abnormalities, with sex-specific differences observed.
  • Synaptic transmission and plasticity were impaired in 10-12 month old male GrnKO mice.
  • Altered dendritic morphology and significantly decreased spine density were noted in hippocampal CA1 pyramidal cells of male GrnKO mice.
  • These functional and morphological changes preceded the onset of most neuropathological abnormalities.

Conclusions:

  • Progranulin deficiency in mice leads to reduced synaptic connectivity and impaired synaptic plasticity.
  • These findings suggest a potential contribution of progranulin deficiency to frontotemporal dementia (FTD) pathology.
  • The study highlights the importance of progranulin in maintaining normal synaptic function and neuronal morphology.