Lamin A/C mediates microglial activation by modulating cell proliferation and immune response

Area of Science:

• Neuroscience
• Cell Biology
• Immunology

Background:

• Lamin A/C influences macrophage activation and premature aging (progeria).
• Microglial overactivation in the brain causes inflammation, accelerating aging and neurodegenerative diseases.

Purpose of the Study:

• To investigate Lamin A/C's role in microglial activation and its link to progeria.
• To elucidate the molecular mechanisms underlying Lamin A/C-mediated microglial regulation.

Main Methods:

• Utilized Lamin A/C-deficient mice (Lmna-/-), primary microglia, and Lmna knockout/knockdown BV2 cell lines.
• Stimulated microglia with lipopolysaccharide (LPS) to assess activation.
• Employed TMT-based quantitative proteomics and bioinformatics for proteome-level analysis.

Main Results:

• Lamin A/C deficiency significantly suppressed microglial activation markers (proliferation, morphology, cytokine secretion).
• Immune response and phagocytosis were impaired in Lamin A/C-deficient microglia.
• Identified Stat1 and Ki67 as key regulatory proteins in Lamin A/C-mediated microglial function and proliferation.

Conclusions:

• Lamin A/C is crucial for normal microglial activation, immune response, and proliferation.
• Lamin A/C-mediated mechanotransduction may be essential for microglial activation.
• This study proposes a novel mechanism for microglial activation involving Lamin A/C.