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Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
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GGA2 and RAB13 promote activity-dependent β1-integrin recycling
Pranshu Sahgal1, Jonna Alanko1, Jaroslav Icha1
1Turku Bioscience Centre, University of Turku and Åbo Akademi University, Turku FIN-20520, Finland.
Journal of Cell Science
|May 12, 2019
Summary
Golgi-localized gamma ear-containing Arf-binding protein 2 (GGA2) and RAB13 regulate active β1-integrin recycling. Silencing these proteins reduces cancer cell migration and invasion by limiting active integrin levels.
Area of Science:
- Cell Biology
- Molecular Biology
- Cancer Research
Background:
- β1-integrins are crucial for cell-matrix interactions, influencing cell adhesion, migration, and cancer invasion.
- The dynamic regulation of integrin trafficking is essential for these cellular processes.
Purpose of the Study:
- To identify regulators of β1-integrin trafficking.
- To investigate the role of Golgi-localized gamma ear-containing Arf-binding protein 2 (GGA2) and RAB GTPases in β1-integrin recycling and cancer cell behavior.
Main Methods:
- RNA interference (RNAi) screen to identify integrin traffic regulators.
- Proximity-dependent biotin identification (BioID) to discover protein interactors.
- Assessment of β1-integrin levels in focal adhesions and cell migration/invasion assays.
Main Results:
- GGA2 was identified as a regulator of active β1-integrin recycling.
- Silencing GGA2 reduced active β1-integrin in focal adhesions, decreasing cancer cell migration and invasion.
- RAB13 and RAB10 were identified as novel GGA2 interactors.
- RAB13 silencing phenocopied GGA2 depletion, impairing active β1-integrin recycling and cell migration.
Conclusions:
- GGA2 and RAB13 are key regulators of active β1-integrin recycling to the plasma membrane.
- These proteins play critical roles in controlling integrin activity and are important for cancer cell migration and invasion.
- GGA2 and RAB13 act as specificity determinants for integrin activity-dependent trafficking.
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