Assay and Isolation of Single Proliferating CD4+ Lymphocytes Using an Automated Microraft Array Platform

Area of Science:

• Immunology
• Biotechnology
• Cancer Research

Background:

• T-cell-based cancer immunotherapy shows promise but faces challenges in identifying cancer-specific T cells.
• Developing effective and specific T-cell therapeutics requires robust methods for single-cell analysis and isolation.

Purpose of the Study:

• To create a versatile platform for single-cell analysis and isolation of T lymphocytes.
• To address the obstacle of identifying T cells reactive to cancer-associated antigens.

Main Methods:

• An automated microscopy and cell sorting system was engineered to monitor human primary CD4+ lymphocyte proliferation.
• The system tracked single-cell behavior in response to allogeneic lymphoblastoid feeder cells.

Main Results:

• The platform achieved high sensitivity (98%) and specificity (99%) in identifying T lymphocytes, with 86% cell collection efficiency.
• 130 clonal colonies were isolated from 4,534 tracked T cells, with 7 growing to over 10,000 cells.
• Interferon-gamma secretion and T cell receptor beta sequences were successfully analyzed from isolated colonies.

Conclusions:

• The developed platform automates the identification and isolation of proliferative T cells.
• This technology facilitates the identification of T cell receptor sequences linked to T cell proliferation, accelerating cancer immunotherapy development.