Mdivi-1: Effective but complex mitochondrial fission inhibitor

Area of Science:

• Neuroscience
• Molecular Biology
• Genomics

Background:

• Mdivi-1 is commonly used to study mitochondrial fusion.
• Its non-mitochondrial effects are not well understood.
• Investigating Mdivi-1's broader molecular impact is crucial.

Purpose of the Study:

• To comprehensively analyze the effects of Mdivi-1 on gene expression and DNA methylation.
• To explore Mdivi-1's impact on mitochondrial function and nuclear-mitochondrial communication.

Main Methods:

• Transcriptome-wide analysis using RNA sequencing (RNA-seq).
• DNA methylome-wide analysis using methyl capture sequencing (MC-seq).
• Gene ontology analysis and integrative data analysis.

Main Results:

• Mdivi-1 upregulated the p53 transcriptional network and downregulated DNA replication initiation genes, causing G1 cell cycle arrest.
• Subtle DNA methylation changes were observed within CpG islands.
• Mitochondrial DNA copy number and transcription decreased, ROS levels increased, activating retrograde signaling.
• The p53 network was activated, while the Parkinson's disease pathway was inhibited.

Conclusions:

• Mdivi-1 exerts effects beyond mitochondrial dynamics, influencing nuclear gene expression and cell cycle regulation.
• The study highlights Mdivi-1's role in activating the p53 network and altering mitochondrial responses.
• Findings provide a deeper understanding of Mdivi-1's molecular mechanisms and nuclear-mitochondrial crosstalk.