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Determination of the Relative Cell Surface and Total Expression of Recombinant Ion Channels Using Flow Cytometry
Published on: September 28, 2016
Analysis of receptor tyrosine kinase internalization using flow cytometry
Ning Li1, Kristen S Hill, Lisa A Elferink
1Department of Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston, TX, USA.
Abstract:
The internalization of activated receptor tyrosine kinases (RTKs) by endocytosis and their subsequent down regulation in lysosomes plays a critical role in regulating the duration and intensity of downstream signaling events. Uncoupling of the RTK cMet from ligand-induced degradation was recently shown to correlate with sustained receptor signaling and increased cell tumorigenicity, suggesting that the corruption of these endocytic mechanisms could contribute to increased cMet signaling in metastatic cancers. To understand how cMet signaling for normal cell growth is controlled by endocytosis and how these mechanisms are dysregulated in metastatic cancers, we developed flow cytometry-based assays to examine cMet internalization.
Insights
Dysregulated endocytosis of receptor tyrosine kinases (RTKs), like cMet, can prolong signaling and increase cancer cell growth. This study developed new assays to examine cMet internalization in normal and metastatic cells.
Area of Science:
- Molecular Biology
- Cell Biology
- Cancer Research
Background:
- Activated receptor tyrosine kinases (RTKs) are internalized via endocytosis and degraded in lysosomes, controlling signaling duration and intensity.
- Dysfunctional cMet receptor degradation is linked to sustained signaling and increased tumorigenicity, suggesting a role in metastatic cancers.
- Understanding RTK endocytosis is crucial for comprehending normal cell growth regulation and cancer-associated signaling dysregulation.
Purpose of the Study:
- To investigate how endocytosis regulates cMet signaling in normal cell growth.
- To elucidate the mechanisms of cMet endocytic dysregulation in metastatic cancers.
- To develop novel assays for examining cMet internalization.
Main Methods:
- Development of flow cytometry-based assays.
- Examination of cMet receptor internalization dynamics.
Main Results:
- Established flow cytometry assays to quantify cMet internalization.
- Provided a framework for analyzing RTK endocytic trafficking in various cellular contexts.
Conclusions:
- Endocytosis is a critical regulator of cMet signaling.
- Aberrant cMet internalization mechanisms may contribute to metastatic cancer progression.
- The developed assays facilitate further investigation into RTK endocytic control and its role in cancer.
