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An improved protocol for measuring cytotoxic T cell activity in anatomic compartments with low cell numbers
T Ostler1, K Schamel, T Hussell
1Children's Hospital, University of Freiburg, Mathildenstrasse 1, D-79106, Freiburg, Germany.
Journal of Immunological Methods
|November 1, 2001
Summary
Researchers optimized chromium-51 (51Cr) release assays to study T and NK cell immune responses in virus-infected mice. This method requires significantly fewer effector cells, enabling analysis from small tissue samples like lungs or brains.
Area of Science:
- Immunology
- Virology
- Cellular Biology
Background:
- Characterizing antigen-specific T and Natural Killer (NK) cell function is crucial for understanding host defense during viral infections.
- Assessing immune cell activity in specific organs like the lung or brain is challenging due to low cell yields from individual mice.
- Standard assays for T and NK cell function often require large numbers of effector cells, limiting their application in localized infections.
Purpose of the Study:
- To develop modified, highly sensitive assays for analyzing T and NK cell function from limited cell populations in vivo.
- To enable the study of ex vivo cytotoxic T lymphocyte (CTL) and NK cell activity in organs like the lung and brain following viral infection.
- To facilitate the assessment of cytokine production, such as interferon-gamma, from virus-specific T cells using reduced cell numbers.
Main Methods:
- Simple modifications to the classical chromium-51 (51Cr) release assay were implemented.
- The modified assay achieved a 10-fold reduction in the number of required effector cells without compromising sensitivity or specificity.
- Flow cytometry was used to analyze interferon-gamma production by virus-specific T cells.
Main Results:
- The optimized assay allows for the study of ex vivo CTL or NK cell activity using as few as 4x10^5 effector cells.
- Virus-specific immune cell activity was successfully analyzed from the lungs of mice infected with respiratory syncytial virus (RSV).
- Immune cell activity was also assessed from the brains of mice infected with Borna disease virus (BDV) with minimal cell input.
- Interferon-gamma production by virus-specific T cells was detectable with as few as 10^5 effector cells.
Conclusions:
- Modified 51Cr release assays and flow cytometry enable sensitive characterization of antigen-specific T and NK cell responses from limited cell numbers.
- These optimized methods are valuable for studying immune cell function in specific organs following localized viral infections.
- The reduced effector cell requirement significantly enhances the feasibility of immunological studies in small animal models and confined tissue compartments.