Neddylation pathway regulates T-cell function by targeting an adaptor protein Shc and a protein kinase Erk signaling

Area of Science:

• Immunology
• Molecular Biology
• Cell Biology

Background:

• NEDD8 (neural precursor cell expressed, developmentally down-regulated 8) is a ubiquitin-like modifier with critical cellular roles.
• Its specific function in the immune system, particularly in T-cells, remains largely unexplored.

Purpose of the Study:

• To investigate the role of protein neddylation in regulating T-cell function.
• To identify potential therapeutic targets for inflammatory diseases within the neddylation pathway.

Main Methods:

• Utilized an in vivo knockdown technique to reduce Ubc12 expression in CD4(+) T cells.
• Employed MLN4924, a NEDD8-activating enzyme inhibitor, to study neddylation inhibition.
• Analyzed T-cell proliferation, cytokine production, and Erk activation.
• Identified Shc as a neddylation target using biochemical assays.

Main Results:

• Reduced Ubc12 expression in CD4(+) T cells impaired T-cell receptor/CD28-induced proliferation and cytokine production.
• These effects were mirrored by MLN4924 treatment, indicating the importance of neddylation.
• Erk activation was reduced, and Shc was identified as a neddylation target.
• Adoptive transfer of Ubc12 knockdown CD4(+) T cells ameliorated allergic responses in mice.

Conclusions:

• Protein neddylation plays a significant role in regulating T-cell function.
• The neddylation pathway, involving Ubc12 and Shc, is critical for T-cell activation and immune responses.
• Targeting protein neddylation presents a potential therapeutic strategy for managing inflammatory diseases.