Protocols for Assessing the Nuclease Activity of MIF

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Macrophage migration inhibitory factor (MIF) possesses nuclease activity crucial for DNA damage response pathways.
• This activity is implicated in the pathogenesis of neurodegenerative diseases and cancer.

Purpose of the Study:

• To establish dual biochemical and cellular assays for measuring MIF nuclease activity.
• To validate these assays for screening potential MIF nuclease inhibitors.

Main Methods:

• Enzymatic assays using recombinant MIF and L1 DNA substrates, analyzed by gel electrophoresis and kinetic studies.
• Cellular assays involving MNNG-treated SH-SY5Y cells and pulse-field gel electrophoresis to assess DNA fragmentation.
• Inhibition studies using the specific MIF nuclease inhibitor PAANIB-1.

Main Results:

• Demonstrated feasibility of quantifying MIF nuclease activity through enzymatic cleavage assays.
• Successfully visualized and quantified DNA fragmentation in stressed cells using pulse-field gel electrophoresis.
• Confirmed the utility of the developed assays in evaluating inhibitor efficacy.

Conclusions:

• Developed robust biochemical and cellular methods to measure MIF nuclease activity.
• These assays provide a platform for screening and developing novel MIF-targeting therapeutics for DNA-related diseases.