T Cells Capture Bacteria by Transinfection from Dendritic Cells

Area of Science:

• Immunology
• Microbiology
• Cell Biology

Background:

• CD4(+) T cells are key adaptive immune cells.
• Dendritic cells (DCs) present antigens to T cells.
• Bacterial transinfection between DCs and T cells is a newly described phenomenon.

Purpose of the Study:

• To analyze the bacterial transinfection process between dendritic cells and CD4(+) T cells.
• To detail a protocol for studying this interaction during antigen presentation.
• To provide methods for quantifying bacterial transmission in this context.

Main Methods:

• Utilized transgenic OTII mice with ovalbumin peptide-specific T cell receptors (TCRs).
• Employed live-cell imaging to monitor Green Fluorescent Protein (GFP)-expressing bacteria dynamics.
• Quantified transinfection using flow cytometry and a gentamicin protection assay.

Main Results:

• Demonstrated the feasibility of analyzing bacterial transinfection during antigen presentation.
• Established methods for monitoring bacterial transmission between DCs and CD4(+) T cells.
• Validated both live-cell imaging and gentamicin assay for quantifying transinfection efficiency.

Conclusions:

• Bacterial transinfection is a relevant process occurring during DC-T cell interactions.
• The described protocol enables detailed analysis and quantification of this phenomenon.
• This work provides a framework for further investigation into immune cell-mediated bacterial spread.