Interferon gamma transcript detection on T cells based on magnetic actuation and multiplex double-tagging...

Area of Science:

• Immunology
• Biotechnology
• Clinical Diagnostics

Background:

• Interferon-gamma (IFN-γ) is a key proinflammatory cytokine crucial for host defense against intracellular pathogens.
• Elevated IFN-γ levels serve as a biomarker for intracellular infections, cancers, and autoimmune disorders.
• Monitoring IFN-γ is vital for assessing disease progression and treatment efficacy in various non-communicable diseases.

Purpose of the Study:

• To develop a novel interferon-gamma release assay (IGRA) for quantifying interferon-γ transcripts.
• To utilize isolated T cells as the source for interferon-γ transcript detection.
• To establish a sensitive and efficient method for biomarker quantification in clinical applications.

Main Methods:

• Sequential magnetic separation techniques, including immunomagnetic separation of T cells using anti-CD3 particles.
• Retrotranscription and multiplex double-tagging PCR on polydT-modified magnetic particles.
• Electrochemical genosensing on streptavidin magnetic particles for transcript detection.

Main Results:

• Quantification of cellular interferon-γ produced by as few as 150 T cells.
• Detection of interferon-γ transcripts from 100 μL of whole blood, suitable for fingerprick sampling.
• Demonstrated outstanding analytical features for the developed assay.

Conclusions:

• The novel IGRA offers a sensitive and efficient method for quantifying interferon-γ transcripts.
• The assay's ability to use small blood volumes and fingerprick sampling makes it clinically advantageous.
• This approach presents a promising strategy for interferon-γ biomarker quantification in diverse clinical settings.