RNA-binding proteins regulate the expression of the immune activating ligand MICB

Area of Science:

• Immunology
• Molecular Biology
• Cellular Stress Response

Background:

• The activating receptor NKG2D on cytotoxic lymphocytes recognizes stress-induced ligands, playing a key role in immune surveillance and disease containment.
• Understanding the mechanisms controlling NKG2D ligand expression is crucial for comprehending immune system danger sensing.
• The precise molecular players regulating stress-induced NKG2D ligands, such as MICB, remain largely uncharacterized.

Purpose of the Study:

• To identify RNA-binding proteins (RBPs) that regulate the expression of MICB, a major stress-induced NKG2D ligand.
• To investigate the functional relevance of identified RBPs in cellular stress responses.

Main Methods:

• Utilized an unbiased RNA pull-down assay coupled with mass spectrometry to identify RBPs binding to MICB mRNA.
• Employed functional assays to assess the role of identified RBPs during genotoxic stress.

Main Results:

• Identified six novel RBPs that bind to and regulate MICB expression.
• Demonstrated that at least two of these RBPs are functional during genotoxic stress conditions.
• Provided a mechanistic link between RBPs, MICB expression, and cellular stress response.

Conclusions:

• The study elucidates key RBPs involved in the post-transcriptional regulation of MICB.
• These findings enhance our understanding of how the immune system senses cellular danger via NKG2D.
• The identified RBPs represent potential therapeutic targets for modulating immune responses in disease contexts.