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Related Experiment Video

Updated: May 24, 2025

Imaging Intracellular Ca2+ Signals in Striatal Astrocytes from Adult Mice Using Genetically-encoded Calcium Indicators
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Short-term lipopolysaccharide treatment leads to astrocyte activation in LRRK2 G2019S knock-in mice without loss of

Hoang Kieu Chi Ngo1,2, Akriti Srivastava1,2, Hoang Le3,2

  • 1Molecular Neurobiology Laboratory, MassGeneral Institute for Neurodegenerative Disease, Department of Neurology, Massachusetts General Hospital, Charlestown, MA, 02129, USA.

BMC Neuroscience
|March 4, 2025
PubMed
Summary

Short-term lipopolysaccharide (LPS) exposure in LRRK2 G2019S mice increased astrocyte activation, not neuron loss. Caffeine mitigated this LPS-induced astrocyte response in Parkinson's disease models.

Keywords:
Astrocyte activationAutophosphorylatonCaffeineDopaminergic neuronal lossG2019SGFAPLPSLRRK2NeuroinflammationParkinson’s disease

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Area of Science:

  • Neuroscience
  • Genetics
  • Pharmacology

Background:

  • The LRRK2 G2019S mutation significantly increases Parkinson's disease (PD) risk but shows incomplete penetrance.
  • Investigating modulating factors is crucial for understanding PD pathogenesis.
  • LRRK2 G2019S knock-in (KI) mouse models are used to study PD mechanisms.

Purpose of the Study:

  • To determine if LRRK2 G2019S KI mice treated with lipopolysaccharide (LPS) can model LRRK2-associated Parkinson's disease.
  • To assess the impact of LPS on dopaminergic neurons and astrocyte activation in LRRK2 G2019S KI mice.

Main Methods:

  • LRRK2 G2019S KI and wild-type (WT) mice were treated with LPS for 2 weeks.
  • Evaluated dopaminergic neuron survival, body weight recovery, LRRK2 phosphorylation, and astrocyte activation (GFAP).
  • Assessed the effect of caffeine administration on LPS-induced changes.

Main Results:

  • LPS treatment did not cause dopaminergic neuron loss in either KI or WT mice.
  • LRRK2 G2019S KI mice exhibited impaired weight recovery post-LPS compared to WT mice.
  • LPS upregulated LRRK2 autophosphorylation (Ser1292) and increased GFAP levels in KI mice, indicating heightened astrocyte activation.
  • Caffeine administration attenuated LPS-induced astrocyte activation specifically in LRRK2 G2019S KI mice.

Conclusions:

  • Short-term LPS exposure (2 weeks) does not induce dopaminergic neurodegeneration in LRRK2 G2019S KI mice.
  • LPS treatment leads to increased astrocyte activation in LRRK2 G2019S KI mice, suggesting neuroinflammation.
  • Caffeine can ameliorate LPS-induced astrocyte activation in this Parkinson's disease model.