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Visualizing toll-like receptor-dependent phagosomal dynamics in murine dendritic cells using live cell microscopy
Adriana R Mantegazza1, Michael S Marks
1Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, 1107B Abramson Research Center, 3615 Civic Center Blvd., Philadelphia, PA, 19104, USA.
Methods in Molecular Biology (Clifton, N.J.)
|February 23, 2015
Summary
Dendritic cells form unique tubules called phagotubules during Toll-like receptor (TLR) signaling. These structures enhance antigen presentation from phagocytosed particles, crucial for immune responses.
Area of Science:
- Immunology
- Cell Biology
- Microscopy
Background:
- Dendritic cells (DCs) are key antigen-presenting cells essential for initiating adaptive immunity.
- Phagocytosis and subsequent antigen processing are critical DC functions.
- Pattern recognition receptor (PRR) signaling, including Toll-like receptors (TLRs), modulates DC function.
Purpose of the Study:
- To describe methods for visualizing phagotubule formation in mouse dendritic cells.
- To investigate the role of Toll-like receptor (TLR) signaling in phagotubule dynamics.
- To understand how phagotubules contribute to antigen presentation.
Main Methods:
- Live cell imaging of mouse dendritic cells.
- Phagocytosis assays using fluorescently labeled latex beads.
- Analysis of phagotubule formation and content exchange.
Main Results:
- Phagosomes undergoing TLR signaling in dendritic cells form numerous long tubules (phagotubules).
- Phagotubules facilitate content exchange between signaling phagosomes.
- This process enhances the presentation of antigens derived from phagocytosed particles.
Conclusions:
- Phagotubule formation is a novel mechanism utilized by dendritic cells during TLR signaling.
- This dynamic process optimizes antigen processing and presentation, thereby influencing T cell priming.
- The described methods enable further investigation into phagotubule-mediated immune functions.
