A novel dendritic cell-based direct ex vivo assay for detection and enumeration of circulating antigen-specific human...

Area of Science:

• Immunology
• Cellular Biology

Background:

• Standardized ex vivo detection of antigen-specific CD4+ T cells is limited by low-dimensional outputs and reliance on non-specific expansion methods.
• Existing assays struggle to accurately quantify T cell precursor frequency and functional responses from human peripheral blood mononuclear cells (PBMCs).

Purpose of the Study:

• To develop a novel, sensitive, and rapid assay for enumerating antigen-specific CD4+ T cell precursor frequency from human PBMCs.
• To enable comprehensive phenotypic profiling of circulating antigen-specific CD4+ T cells for deeper insights into immune responses.

Main Methods:

• Utilized antigen-pulsed autologous human dendritic target cells.
• Employed multiparametric flow cytometry for sensitive detection and quantification.
• Assessed T cell responses following primary and recall antigenic stimulation.

Main Results:

• Successfully developed a novel methodology for accurate enumeration of antigen-specific CD4+ T cell precursor frequency.
• Demonstrated reproducible quantification of poly-functional T cell responses.
• Enabled comprehensive phenotypic characterization of circulating antigen-specific CD4+ T cells.

Conclusions:

• The novel assay overcomes limitations of existing methods for ex vivo T cell detection.
• Provides a sensitive and detailed tool for analyzing antigen-specific CD4+ T cell responses.
• Facilitates advancements in vaccine development, immune-oncology, and therapeutic studies.