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Inhibition of mitochondrial transcription by the neurotoxin MPP

Alexander Pfab1, Sergey Belikov1, Michaela Keuper1

  • 1Dept. Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, 10691, Stockholm, Sweden.

Experimental Cell Research
|March 1, 2023
PubMed

Insights

The neurotoxin MPP+ directly impairs mitochondrial transcription within 30 minutes, impacting cellular energy production. Nuclear gene transcription remains unaffected, suggesting secondary adaptation responses in Parkinson

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • The neurotoxin MPP+ is implicated in dopamine neuron death and Parkinson's disease.
  • The immediate transcriptional effects of MPP+ on cells are not well understood.

Purpose of the Study:

  • To investigate the early transcriptional response of human cells to MPP+ exposure.
  • To determine the direct impact of MPP+ on mitochondrial and nuclear transcription.

Main Methods:

  • Human SH-SY5Y cells were treated with a low dose of MPP+ (0.1 mM).
  • Nascent transcription was measured using precision run-on sequencing (PRO-seq).

Main Results:

  • MPP+ significantly reduced mitochondrial genome transcription within 30 minutes.
  • Nuclear gene transcription was not affected by MPP+ at this early time point.
  • MPP+ inhibited respiratory complex I, leading to decreased ATP production and reduced mitochondrial RNA polymerase activity.

Conclusions:

  • MPP+ directly affects mitochondrial function and transcription.
  • Observed gene expression changes are likely secondary adaptations to cellular stress, not primary transcriptional responses.
Keywords:
ATPMitochondriaNeurotoxinParkinson's diseaseRespirationTranscription

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