Benchmarking In-Cell Proteomics for Profiling Neuroblastoma Cell Differentiation and the Ubiquitin-Proteasome System

Area of Science:

• Proteomics
• Neuroscience
• Cell Biology

Background:

• SH-SY5Y neuroblastoma cells are key models for neurodegenerative disease research.
• Deep understanding of SH-SY5Y cell differentiation requires advanced proteomic approaches.

Purpose of the Study:

• To benchmark an "in-cell proteomics" strategy against traditional methods for SH-SY5Y cell analysis.
• To characterize proteomic changes during SH-SY5Y cell differentiation.
• To investigate the role of protein homeostasis in neuroblastoma differentiation.

Main Methods:

• Systematic comparison of "in-cell proteomics" with sodium dodecyl sulfate (SDS) lysate-based methods.
• Application of the optimized "in-cell proteomics" strategy to undifferentiated, partially, and terminally differentiated SH-SY5Y cells.
• Identification and quantification of over 9000 proteins, including neuronal markers and ubiquitin-proteasome system components.

Main Results:

• The "in-cell proteomics" strategy demonstrated superior simplicity, sensitivity, and quantitation accuracy.
• Detected key proteins involved in neuronal development, integrity, and synaptic function.
• Observed stage-specific expression of E3 ubiquitin ligases, deubiquitinases (DUBs), and proteasome subunits, highlighting the role of protein homeostasis.

Conclusions:

• The study presents the first benchmark dataset for neuroblastoma cells using "in-cell proteomics".
• This method shows significant potential for cataloging neuronal functions and understanding neuroblastoma differentiation.
• Protein homeostasis is crucial for neuroblastoma cell differentiation.