Is inflammation a direct response to dsDNA breaks?

Area of Science:

• Cell Biology
• Molecular Biology
• Genetics

Background:

• Extracellular chromatin (cfCh) from dying cells can enter healthy cells.
• Genomic integration of cfCh can cause double-strand DNA (dsDNA) breaks.
• dsDNA breaks trigger inflammatory responses.

Purpose of the Study:

• To investigate the consequences of cfCh genomic integration in healthy cells.
• To explore the relationship between cfCh-induced DNA breaks and inflammatory cytokine activation.
• To propose a novel role for inflammatory cytokines in the DNA damage response (DDR).

Main Methods:

• Observational studies on cellular uptake of cfCh.
• Analysis of DNA damage markers following cfCh integration.
• Assessment of inflammatory cytokine expression kinetics.
• Testing cfCh inactivating agents to prevent DNA breaks and inflammation.

Main Results:

• Genomic integration of cfCh was observed in healthy cells.
• cfCh integration led to concurrent dsDNA breaks and inflammatory cytokine activation.
• Inflammation induction was abrogated by preventing DNA breaks using cfCh inactivating agents.

Conclusions:

• Inflammatory cytokines may represent a novel family of DDR proteins.
• Activation of these cytokines is linked to dsDNA breaks from cfCh genomic integration.
• Targeting cfCh or DNA breaks could modulate inflammatory responses.