Measuring Mitochondrial Function of Naïve and Effector CD8 T Cells
March 28th, 2025
CD8 T cell bioenergetics can be interrogated using the Mito Stress Test. This methodology can be used to study acute and chronic metabolic programming. This protocol describes approaches to examine the relationships between T cell receptor biology and bioenergetic analysis.
Our lab studies immune tolerance, immune surveillance, and antigen receptor signaling by lymphocytes. We found that lysophosphatidic acid disrupts CD8 T cell cytotoxicity promoting peripheral tolerance by reducing metabolic flexibility in effector cells. We use technologies to measure mitochondrial metabolism and energy capacities in CD8 T-Cells.
Our laboratory has shown that lysophosphatidic acid modulates metabolic fitness of CD8 T-Cells and may be an important determinant of T cell phenotypes. Our protocol described here assesses functional metabolism and bioenergetics of T cell receptor signaling in real time. To begin, add 200 microliters of distilled water into each well of a utility plate.
Place a sensor cartridge on top of the utility plate, ensuring that the ends of the sensor cartridge are submerged to allow proper hydration. Incubate the utility plate with the sensor cartridge at 37 degrees Celsius for a minimum of 10 hours in a non-carbon dioxide incubator. Next, fill a 50 milliliter conical tube with 50 milliliters of calibrant solution and incubate.
The next day, flick the plate to remove the distilled water. Rehydrate the plate with 200 microliters of calibrant. Replace the sensor cartridge on top of the utility plate and place the utility plate back in the non-carbon dioxide incubator.
Next, use a multi-channel pipette to re-suspend 10 million CD8 T-Cells in 4.5 milliliters of complete medium. Pipette 90 microliters of the suspension to each well followed by 90 microliters of the designated medium per well during pre-treatment. Pipette 180 microliters of complete medium into the corner wells to prevent evaporation.
Then place the microplate with the CD8 T-Cells in a non-carbon dioxide incubator. Place the plate adapters securely on the sensor cartridge. After incubation, use plate adapters to pipette Oligomycin, FCCP, Rotenone, and Antimycin A into the respective ports.
Place the microplate in the non-carbon dioxide incubator one hour before starting the assay. Open the software and calibrate the instrument analyzer 30 minutes prior to loading the microplate. Label the wells and review the injection scheme in the software system.
Then load the sensor cartridge into the instrument during calibration. Run the assay through the software. For additional injections, modify the injection schemes using the additional chamber for the injection.
Load anti-CD3 and anti-CD28 into Port A of the sensor cartridge. Load Oligomycin into Port B, FCCP into Port C, and Rotenone and Antimycin A into Port D.For individual anti-CD3 and anti-CD28 stimulation, pipette 20 microliters of biotinylated anti-CD3 at 10 micrograms per milliliter into the designated wells of the sensor cartridge. Pipette 20 microliters of anti-CD28 and streptavidin into the designated wells.
For anti-CD3 or CD28 stimulation, combine and pipette 20 microliters of biotinylated anti-CD3, anti-CD28, and streptavidin into the designated wells. Prepare the control wells by injecting media. For combined anti-CD3 and CD-28 stimulation, use a one-to-one bead to cell ratio and pipette five microliters of anti-CD3 CD-28 magnetic beads into the designated wells containing 200, 000 cells per well.
Prepare control wells with media only for injection. Adjust the poisons in each port to achieve final post-injection concentrations. Ensure the injection scheme reflects updated time points before loading the microplate into the instrument.
Program the software to run the acute TCR stimulation assay for a total of 140 minutes. Modify the scheme to include 10 time point measurements prior to the injection of Oligomycin. Acute TCR stimulation using biotinylated anti-CD3 and/or anti-CD28 with streptavidin and anti-CD3 and/or CD-28 magnetic bead stimulation resulted in increased oxygen consumption rate and extracellular acidification rate compared to media-only controls.
Anti-CD3 and CD-28 magnetic bead stimulation showed metabolic responses comparable to biotinylated anti-CD3 and CD-28 injections with similar increases in oxygen consumption rate and extracellular acidification rate.
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Overview
This study investigates the impact of lysophosphatidic acid on CD8 T cell cytotoxicity and metabolic flexibility. The methodology includes the Mito Stress Test to analyze T cell bioenergetics and receptor signaling.
Key Study Components
Area of Science
- Immunology
- Cell Metabolism
- T cell Biology
Background
- CD8 T cells play a crucial role in immune responses.
- Lysophosphatidic acid affects T cell function and metabolism.
- Understanding metabolic programming is essential for immune tolerance.
- Bioenergetic analysis can reveal insights into T cell behavior.
Purpose of Study
- To examine the effects of lysophosphatidic acid on CD8 T cell metabolism.
- To assess the relationship between T cell receptor signaling and bioenergetics.
- To utilize real-time analysis for functional metabolism assessment.
Methods Used
- Mito Stress Test for bioenergetic profiling.
- Measurement of mitochondrial metabolism in CD8 T cells.
- Experimental protocols for assessing metabolic flexibility.
- Real-time analysis of T cell receptor signaling.
Main Results
- Lysophosphatidic acid reduces metabolic flexibility in CD8 T cells.
- Altered metabolic fitness influences T cell phenotypes.
- Real-time assessments provide insights into T cell bioenergetics.
- Findings suggest potential therapeutic targets for immune modulation.
Conclusions
- Lysophosphatidic acid is a key regulator of CD8 T cell metabolism.
- Understanding metabolic changes can inform immune tolerance strategies.
- Future studies may explore therapeutic implications for T cell modulation.
Frequently Asked Questions
Executive Industry Relevance
Quantitative assessment of mitochondrial function in naïve and effector CD8 T cells enables mechanistic de-risking of immunometabolic targets in early discovery. Real-time bioenergetic profiling supports predictive confidence in T cell functional states, informing target validation and translational continuity. This workflow positions immunometabolism as a critical axis for portfolio triage and immune modulation strategies.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables interrogation of T cell metabolic pathways linked to immune function.
- Supports biological de-risking by quantifying metabolic flexibility in response to receptor stimulation.
- Facilitates functional target validation through real-time measurement of oxygen consumption and acidification rates.
- Provides predictive confidence for prioritizing immunometabolic targets.
Screening & Assay Development
- Prepares validated immune cell systems for downstream compound screening.
- Standardizes assay conditions for reproducible measurement of mitochondrial activity.
- Generates quantitative outputs suitable for comparative analysis across conditions.
- Enables scalable adaptation for high-content screening of metabolic modulators.
Translational & Preclinical Research
- Aligns metabolic phenotyping with disease-relevant immune cell states.
- Supports continuity from discovery through preclinical validation of immune modulation strategies.
- Informs risk-adjusted advancement decisions based on functional metabolic readouts.
- Provides mechanistic insight into immune tolerance and surveillance pathways.
Pipeline & Workflow Integration
This bioenergetic analysis method integrates from early discovery through lead identification and preclinical immune modulation studies.
- Discovery Biology: Quantifies T cell metabolic responses to receptor stimulation, clarifying pathway dependencies.
- Screening: Delivers reproducible, quantitative mitochondrial function data for assay readiness.
- Analytics: Provides oxygen consumption and extracellular acidification rates for robust statistical comparison.
- Translational Research: Links immune cell metabolism to functional phenotypes relevant for disease models.
- Enterprise Reuse: Offers a customizable platform for diverse immunometabolic investigations across programs.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence in immune target validation and mechanistic de-risking.
- Operational Value: Standardizes metabolic assays for reproducibility and scalability across teams.
- Strategic Value: Enables informed go/no-go decisions and reduces late-stage biological risk in immune portfolios.
- Portfolio Impact: Supports risk-adjusted prioritization of immunometabolic targets and translational strategies.
Implementation Considerations
- Requires expertise in immune cell isolation and metabolic assay setup.
- Needs access to instrument analyzers and compatible software for real-time data acquisition.
- Demands cross-team standardization of assay conditions and data interpretation.
- Adaptable to various immune cell types and receptor stimulation protocols.
- Dependent on robust control and calibration procedures for reliable outputs.
