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A LRRK2 GTP Binding Inhibitor, 68, Reduces LPS-Induced Signaling Events and TNF-α Release in Human Lymphoblasts

Tianxia Li1,2, Bo Ning1, Lingbo Kong1,2

  • 1Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA.

Cells
|March 6, 2021
PubMed

Insights

Leucine-rich repeat kinase-2 (LRRK2) plays a role in inflammation. Inhibiting LRRK2 reduces inflammatory responses in human lymphoblasts, suggesting therapeutic potential for LRRK2-associated immune disorders.

Area of Science:

  • Immunology
  • Cell Biology
  • Genetics

Background:

  • Mutations in the leucine-rich repeat kinase-2 (LRRK2) gene are linked to Parkinson's disease and influence susceptibility to immunological disorders.
  • LRRK2 expression in B lymphocytes and macrophages suggests a role in immune function.
  • The study investigates LRRK2's role in inflammatory responses within human lymphoblasts.

Purpose of the Study:

  • To characterize LRRK2 protein expression and phosphorylation in human lymphoblasts.
  • To investigate the effect of lipopolysaccharide (LPS) on LRRK2 activity and associated signaling pathways.
  • To evaluate the anti-inflammatory potential of an LRRK2 inhibitor.

Main Methods:

  • Human lymphoblasts were treated with lipopolysaccharide (LPS).
  • LRRK2 expression, kinase activity, and phosphorylation were analyzed.
  • Interactions between TRAF6 and LRRK2, and phosphorylation of MAPK and IkBα were assessed.
  • The effect of LRRK2 inhibitor 68 on LPS-induced responses was examined.

Main Results:

  • LPS increased LRRK2 expression and kinase activity in a time-dependent manner.
  • LPS activated the Toll-like receptor (TLR) pathway, increasing TRAF6/LRRK2 interaction and MAPK/IkBα phosphorylation.
  • LRRK2 inhibitor 68 reduced LPS-induced TRAF6/LRRK2 interaction and phosphorylation, decreasing TNF-α secretion.

Conclusions:

  • LRRK2 is actively involved in proinflammatory responses in human lymphoblasts.
  • Inhibition of LRRK2 by compound 68 demonstrates an anti-inflammatory effect.
  • These findings highlight LRRK2's role in immune responses and suggest therapeutic potential for LRRK2 inhibitor 68 in immunological disorders.
Keywords:
GTP binding inhibitorLPSLRRK2Parkinson’s diseaseTNF-αlymphoblast

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