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Published on: July 25, 2014
Proximity Labeling: Precise Proteomics Technology for Mapping Receptor Protein Neighborhoods at the Cancer Cell
1Department of Biomedical Engineering, Division of Oncological Sciences, Knight Cancer Institute, Oregon Health & Science University, Portland, OR 97201, USA.
Abstract:
Cell surface receptors are pivotal to cancer cell transformation, disease progression, metastasis, early detection, targeted therapy, drug responses, and clinical outcomes. Since they coordinate complex signaling communication networks in the tumor microenvironment, mapping the physical interaction partners of cell surface receptors in vivo is vital for understanding their roles, functional states, and suitability as therapeutic targets. Yet traditional methods like immunoprecipitation and affinity purification-mass spectrometry often fail to detect key but weak or transient receptor-protein interactions. Proximity labeling, a cutting-edge proteomics technology, addresses these technical challenges by enabling precise mapping of protein neighborhoods around a receptor target on the cell surface of cancer cells. This technique has been successfully applied in vitro and in vivo for proteomic mapping across various model systems. This review explores the fundamental principles, technologies, advantages, limitations, and applications of proximity labeling in cancer biology, focusing on mapping receptor microenvironments. By advancing mechanistic insights into cancer cell receptor signaling mechanisms, proximity labeling is poised to transform cancer research, improve targeted therapies, and illuminate avenues to overcome drug resistance.
Insights
Proximity labeling maps cancer cell receptor interactions, revealing signaling networks crucial for understanding cancer progression and developing targeted therapies. This proteomics technique overcomes limitations of traditional methods for improved cancer research.
Area of Science:
- Proteomics
- Cancer Biology
- Cell Signaling
Background:
- Cell surface receptors are critical in cancer, influencing transformation, progression, metastasis, and treatment response.
- Understanding receptor interactions within the tumor microenvironment is vital for identifying therapeutic targets.
- Traditional methods struggle to detect weak or transient receptor-protein interactions.
Purpose of the Study:
- To review the principles, technologies, and applications of proximity labeling in cancer biology.
- To highlight proximity labeling's role in mapping cell surface receptor microenvironments.
- To discuss how this technique advances mechanistic insights into cancer cell signaling.
Main Methods:
- Proximity labeling, a proteomics technique, enables precise mapping of protein neighborhoods around cell surface receptors.
- This method overcomes limitations of traditional techniques like immunoprecipitation.
- Successfully applied in vitro and in vivo across various model systems.
Main Results:
- Proximity labeling precisely maps protein interactions near cell surface receptors.
- It reveals complex signaling networks within the tumor microenvironment.
- Identifies functional states and suitability of receptors as therapeutic targets.
Conclusions:
- Proximity labeling offers a powerful approach to study cancer cell receptor signaling.
- It provides mechanistic insights to improve targeted cancer therapies.
- This technique can illuminate strategies to overcome drug resistance in cancer treatment.
