Rcor2 underexpression in senescent mice: a target for inflammaging?

Area of Science:

• Neuroscience
• Immunology
• Genetics

Background:

• Aging is associated with chronic low-grade inflammation (inflammaging), contributing to neurodegenerative diseases like Alzheimer's.
• Molecular mechanisms driving chronic neuroinflammation are not fully understood.
• REST corepressor (Rcor)-2 is a chromatin regulator implicated in inflammation and longevity.

Purpose of the Study:

• To investigate the role of Rcor2 in age-related inflammation.
• To determine Rcor2's impact on neuroinflammation.

Main Methods:

• Gene expression analysis in senescence-accelerated P8 and control R1 mice at different ages.
• siRNA-mediated knockdown of Rcor2 in astrocyte cultures.
• In vivo and in vitro studies on the effects of lipopolysaccharide (LPS) on Rcor2 and inflammatory markers.

Main Results:

• Rcor2 gene expression was significantly decreased in P8 mice compared to R1 controls across various tissues, including the brain.
• Reduced Rcor2 in astrocytes correlated with increased interleukin-6 (Il-6) expression.
• LPS treatment downregulated Rcor2 and upregulated pro-inflammatory cytokines (Tnf-α, Il1-β, Il6) in vivo and in vitro.
• siRNA-mediated Rcor2 knockdown exacerbated Il-6 upregulation, particularly in P8 astrocytes under LPS stimulation.

Conclusions:

• Rcor2 downregulation is closely associated with increased inflammation.
• Rcor2 may function as a critical regulator of inflammaging and neuroinflammation.