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Updated: Dec 23, 2025
Heterokaryon Technique for Analysis of Cell Type-specific Localization
Published on: March 11, 2011
Profiling of subcellular EGFR interactome reveals hnRNP A3 modulates nuclear EGFR localization
Tong-Hong Wang1,2, Chih-Ching Wu3,4,5,6, Kuo-Yen Huang7
1Graduate Institute of Health Industry Technology and Research Center for Food and Cosmetic Safety, Research Center for Chinese Herbal Medicine, College of Human Ecology, Chang Gung University of Science and Technology, Taoyuan, 333, Taiwan.
Abstract:
The aberrant subcellular translocation and distribution of epidermal growth factor receptor (EGFR) represent a major yet currently underappreciated cancer development mechanism in non-small cell lung cancer (NSCLC). In this study, we investigated the subcellular interactome of EGFR by using a spectral counting-based approach combined with liquid chromatography-tandem mass spectrometry to understand the associated protein networks involved in the tumorigenesis of NSCLC. A total of 54, 77, and 63 EGFR-interacting proteins were identified specifically in the cytosolic, mitochondrial, and nuclear fractions from a NSCLC cell line, respectively. Pathway analyses of these proteins using the KEGG database shown that the EGFR-interacting proteins of the cytosol and nucleus are involved in the ribosome and spliceosome pathways, respectively, while those of the mitochondria are involved in metabolizing propanoate, fatty acid, valine, leucine, and isoleucine. A selected nuclear EGFR-interacting protein, hnRNP A3, was found to modulate the accumulation of nuclear EGFR. Downregulation of hnRNP A3 reduced the nuclear accumulation of EGFR, and this was accompanied by reduced tumor growth ability in vitro and in vivo. These results indicate that variations in the subcellular translocation and distribution of EGFR within NSCLC cells could affect tumor progression.
Insights
Aberrant epidermal growth factor receptor (EGFR) distribution in non-small cell lung cancer (NSCLC) cells drives tumor progression. Targeting EGFR
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Aberrant subcellular localization of epidermal growth factor receptor (EGFR) is implicated in non-small cell lung cancer (NSCLC) pathogenesis.
- Understanding the protein networks interacting with EGFR in different cellular compartments is crucial for elucidating its role in tumorigenesis.
Purpose of the Study:
- To investigate the subcellular interactome of EGFR in NSCLC cells.
- To identify protein networks associated with EGFR in cytosolic, mitochondrial, and nuclear fractions.
- To explore the functional consequences of EGFR subcellular translocation on tumor progression.
Main Methods:
- Utilized spectral counting and liquid chromatography-tandem mass spectrometry (LC-MS/MS) to identify EGFR-interacting proteins.
- Performed KEGG pathway analysis on identified protein sets from different cellular fractions.
- Investigated the role of a specific nuclear EGFR-interacting protein, hnRNP A3, in regulating nuclear EGFR accumulation and tumor growth.
Main Results:
- Identified 54, 77, and 63 EGFR-interacting proteins in cytosolic, mitochondrial, and nuclear fractions, respectively.
- EGFR interactors in the cytosol are linked to ribosome pathways, in mitochondria to metabolic pathways (propanoate, fatty acid, amino acid metabolism), and in the nucleus to spliceosome pathways.
- Downregulation of nuclear hnRNP A3 reduced nuclear EGFR accumulation and impaired tumor growth in vitro and in vivo.
Conclusions:
- EGFR subcellular translocation and distribution are significant mechanisms in NSCLC development.
- Specific protein networks associated with EGFR in different compartments play distinct roles in cancer progression.
- Modulating nuclear EGFR accumulation via proteins like hnRNP A3 presents a potential therapeutic strategy for NSCLC.
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