Related Experiment Video

Updated: Mar 19, 2026

Human Peripheral Blood Neutrophil Isolation for Interrogating the Parkinson's Associated LRRK2 Kinase Pathway by Assessing Rab10 Phosphorylation
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Human Peripheral Blood Neutrophil Isolation for Interrogating the Parkinson's Associated LRRK2 Kinase Pathway by Assessing Rab10 Phosphorylation

Published on: March 21, 2020

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Peripheral inflammation mediates midbrain Lrrk2 kinase activity via Rab32 expression

Jordan Follett, Isaac Bul Deng, Robert C Sharp

    Biorxiv : the Preprint Server for Biology
    |March 18, 2026
    PubMed

    Insights

    Peripheral inflammation triggers Rab32 expression in microglia, activating Lrrk2 kinase. This pathway links inflammation to Parkinson's disease risk, highlighting Rab32/Tfe3 as potential therapeutic targets.

    Area of Science:

    • Neuroscience
    • Molecular Biology
    • Immunology

    Background:

    • Mutations in leucine-rich repeat kinase 2 (LRRK2) increase Parkinson's disease (PD) risk, but incomplete penetrance indicates other factors are involved.
    • Rab32 Ser71Arg was recently identified as a Mendelian gene for PD, suggesting a role for Rab32 in disease pathogenesis.

    Purpose of the Study:

    • To establish Rab32 as a mediator linking peripheral inflammation to Lrrk2 activation in Parkinson's disease.
    • To investigate the role of Tfe3 in regulating Rab32 expression and Lrrk2 activity during inflammation.

    Main Methods:

    • In vivo studies using lipopolysaccharide (LPS) to induce peripheral inflammation in mice.
    • Analysis of Rab32 expression in microglia and dopaminergic neurons.
    • Utilizing human induced pluripotent stem cell-derived microglia to assess species-conserved responses.
    • Promoter analysis to identify regulatory elements controlling Rab32 expression.
    • Investigating the nuclear translocation of Tfe3 in response to inflammation.

    Main Results:

    • Peripheral LPS-induced inflammation selectively increased Rab32 expression in midbrain microglia, correlating with Lrrk2 kinase activity.
    • LPS induced Rab32 expression in human microglia, indicating a conserved inflammatory response.
    • Tfe3 was identified as a key driver of LPS-induced Rab32 expression and Lrrk2 activation.
    • Tfe3 nuclear translocation in microglia during inflammation enhanced Rab32 expression and Lrrk2 activity.
    • Knockdown of Tfe3 mitigated inflammation-induced Rab32 expression and Lrrk2 activation.

    Conclusions:

    • Rab32 acts as a crucial mediator linking peripheral inflammation to Lrrk2 activation in Parkinson's disease.
    • The Rab32/Tfe3 pathway represents a novel mechanism by which inflammation modulates Lrrk2 activity.
    • Targeting Rab32 and Tfe3 offers a potential therapeutic strategy for neuroprotection in Parkinson's disease.

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