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Updated: Feb 7, 2026

Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis
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Loss of Microglial Parkin Inhibits Necroptosis and Contributes to Neuroinflammation

Pedro Elói Antunes Dionísio1, Sara Rodrigues Oliveira1, Joana São José Dias Amaral2

  • 1Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, 1649-003, Lisbon, Portugal.

Molecular Neurobiology
|August 4, 2018
PubMed

Insights

Parkin deficiency in microglia exacerbates inflammation and promotes cell survival, contributing to chronic neuroinflammation. Loss of parkin impacts necroptosis and inflammatory responses in microglial cells.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Immunology

Background:

  • Parkin, an E3 ubiquitin ligase, is linked to Parkinson's disease (PD).
  • Necroptosis is a regulated form of cell death involving RIP1 and RIP3.
  • Parkin's role in modulating inflammation and necroptosis is suggested but not fully understood, especially in microglia.

Purpose of the Study:

  • To investigate the influence of parkin on microglial cell function, specifically regarding necroptosis and inflammation.
  • To determine if parkin deficiency affects microglial cell death pathways and inflammatory responses.

Main Methods:

  • Utilized BV-2 microglial cells, N9 microglial cells, and primary microglia.
  • Induced cell death using zVAD.fmk (zVAD) and assessed its inhibition by necrostatin-1 (Nec-1).
  • Analyzed necrosome assembly, MLKL phosphorylation, TNF-α secretion, and pro-inflammatory gene expression.
  • Employed parkin knockdown (siRNA-PARK2) and assessed RIP1 ubiquitination and inflammatory signaling pathways (NF-κB/JNK).

Main Results:

  • zVAD induced RIP1-dependent necroptosis in BV-2 cells, characterized by necrosome assembly and MLKL phosphorylation, inhibited by Nec-1.
  • Parkin knockdown protected BV-2 cells from zVAD-induced necroptosis, correlating with increased RIP1 ubiquitination.
  • Parkin-silenced microglia exhibited exacerbated pro-inflammatory gene expression and NF-κB/JNK activation upon LPS stimulation, independent of necroptosis.
  • No alterations in mitochondrial ROS production were observed, ruling out parkin's role in mitophagy.

Conclusions:

  • Parkin plays a significant role in modulating microglial ubiquitination, necroptosis, and inflammatory responses.
  • Parkin loss in microglia exacerbates inflammation and promotes cell survival, potentially contributing to chronic neuroinflammation in Parkinson's disease.
  • These findings highlight parkin's unsuspected functions in microglia and their implications for neurodegenerative disease pathogenesis.
Keywords:
InflammationMicrogliaNecroptosisParkinUbiquitination

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