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SNX17 Regulates Antigen Internalisation and Phagosomal Maturation by Dendritic Cells
Sofía Dinamarca1, Cristina Croce1, Anna Salvioni2
1Instituto de Histología y Embriología de Mendoza (IHEM), Universidad Nacional de Cuyo, CONICET, Mendoza, Argentina.
Immunology
|November 19, 2024
Summary
Sorting nexin 17 (SNX17) is crucial for dendritic cells (DCs) to internalize antigens for cross-presentation. SNX17 regulates DC endocytosis, ensuring effective immune responses against pathogens and tumors.
Area of Science:
- Immunology
- Cell Biology
Background:
- Antigen cross-presentation by dendritic cells (DCs) is vital for initiating CD8+ T cell responses.
- The endocytic pathway in DCs is specialized for processing exogenous antigens for presentation on MHC-I molecules.
Purpose of the Study:
- To identify key regulators of antigen internalization and cross-presentation in DCs.
- To investigate the role of sorting nexin 17 (SNX17) in DC function.
Main Methods:
- Investigated SNX17 expression and function in DCs.
- Utilized techniques to assess antigen internalization via endocytosis and phagocytosis.
- Analyzed the impact of SNX17 on integrin recycling, actin organization, and phagosomal maturation.
Main Results:
- SNX17 expression in DCs is essential for optimal cross-presentation of various antigens.
- Silencing SNX17 impaired antigen internalization through fluid-phase endocytosis, phagocytosis, and Toxoplasma gondii invasion.
- SNX17 was found to regulate integrin recycling, actin cytoskeleton organization, and phagosomal maturation.
Conclusions:
- SNX17 is a critical regulator of the DC endocytic network.
- SNX17 plays a central role in enabling competent antigen cross-presentation by DCs.
- These findings highlight SNX17 as a potential target for modulating immune responses.
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