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iTRAQ-Based Membrane Proteomics Reveals Plasma Membrane Proteins Change During HepaRG Cell Differentiation
Mingzhi Zhao1, Feng Xu1, Feilin Wu1,2
1State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences Beijing, Beijing Institute of Radiation Medicine , Beijing 102206, P. R. China.
Journal of Proteome Research
|October 30, 2016
Summary
This study reveals key membrane proteins like MMP-14 and OCLN that drive HepaRG cell differentiation, proliferation, and migration. Understanding these proteins offers insights into liver cell behavior and tumor cell migration.
Area of Science:
- Hepatology
- Proteomics
- Cell Biology
Background:
- HepaRG cells are bipotent liver progenitor cells that require differentiation to exhibit hepatocyte functions.
- The molecular mechanisms governing the transition from undifferentiated to differentiated states, including proliferation, migration, and differentiation, are not fully understood.
- Plasma membrane proteins play crucial roles in cellular processes but their expression changes during HepaRG cell differentiation are largely uncharacterized.
Purpose of the Study:
- To systematically analyze changes in membrane protein expression during HepaRG cell differentiation.
- To identify key membrane proteins involved in proliferation, migration, and differentiation of HepaRG cells.
- To validate the role of identified proteins, specifically MMP-14 and OCLN, in cellular processes.
Main Methods:
- Quantitative membrane proteomics using iTRAQ labeling to analyze HepaRG cell membrane protein expression.
- Bioinformatic analysis including function and disease clustering.
- Validation of key protein candidates using quantitative reverse transcription PCR (qRT-PCR) and Western blot.
- Functional blockade of Matrix Metalloproteinase-14 (MMP-14) to assess its role in tumor cell migration.
Main Results:
- Identified 70 differentially expressed membrane proteins out of 849 quantified proteins during HepaRG cell differentiation.
- Eleven differentially expressed proteins were functionally linked to proliferation, migration, and differentiation.
- Matrix Metalloproteinase-14 (MMP-14) and Occludin (OCLN) were validated as key factors.
- Blockade of MMP-14 significantly impacted tumor cell migration.
Conclusions:
- The study identified critical membrane proteins, including MMP-14 and OCLN, that regulate HepaRG cell differentiation and associated cellular behaviors.
- MMP-14 plays a significant role in tumor cell migration, suggesting potential therapeutic targets.
- This research provides valuable proteomic data for understanding liver progenitor cell biology and cancer progression.
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