Measurement of Mitochondrial Mass and Membrane Potential in Hematopoietic Stem Cells and T-cells by Flow Cytometry

Mukul Girotra; Anne-Christine Thierry; Alexandre Harari; George Coukos; Olaia Naveiras; Nicola Vannini

doi:10.3791/60475

Messung des mitochondrialen Masse- und Membranpotenzials in hämatopoetischen Stammzellen und T-Ze...

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Measurement of Mitochondrial Mass and Membrane Potential in Hematopoietic Stem Cells and T-cells by Flow Cytometry

Messung des mitochondrialen Masse- und Membranpotenzials in hämatopoetischen Stammzellen und T-Zellen durch Durchflusszytometrie

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07:57 min

December 26, 2019

DOI: 10.3791/60475-v

Mukul Girotra*^1,2, Anne-Christine Thierry³, Alexandre Harari^1,3, George Coukos¹, Olaia Naveiras^2,4, Nicola Vannini*¹

¹Department of Oncology UNIL CHUV, Ludwig Institute for Cancer Research Lausanne,University of Lausanne, ²Swiss Institute for Experimental Cancer Research (ISREC), School of Life Sciences,Swiss Federal Institute of Technology Lausanne (EPFL), ³Center of Experimental Therapeutics, Department of Oncology,Centre Hospitalier Universitaire Vaudois, ⁴Hematology Service, Department of Oncology,Centre Hospitalier Universitaire Vaudois (CHUV)

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Overview

This study presents a reliable flow cytometry-based assay for measuring mitochondrial mass and membrane potential in living ex vivo cultured hematopoietic stem cells (HSCs) and T cells. The method is particularly useful for analyzing rare cell populations and can be combined with functional assays to evaluate HSC functionality.

Key Study Components

Research Area

Cell Biology
Hematopoietic Stem Cells
Metabolic Profiling

Background

Standard metabolic assays are ineffective for rare cell populations.
Understanding mitochondrial function is crucial for enhancing HSC functionality.
Previous literature lacks detailed protocols for low cell numbers.

Methods Used

Flow cytometry for mitochondrial profiling
Ex vivo cultured hematopoietic stem cells and T cells
Use of nicotinamide riboside and TMRM staining for evaluating mitochondrial status

Main Results

Nicotinamide riboside treatment increased TMRM low population and decreased TMRM fluorescence intensity in HSCs.
Mitochondrial mass remained unchanged with treatment.
The method successfully identifies specific cell populations through FACS analysis.

Conclusions

This study provides a critical method for assessing metabolic fitness in HSCs.
It's relevant for improving HSC function in bone marrow transplants and other therapeutic contexts.

Frequently Asked Questions

What is the purpose of this protocol?

To measure mitochondrial mass and membrane potential in low numbers of hematopoietic stem cells and T cells.

How does the method benefit research on stem cells?

It enables the analysis of mitochondrial metabolism, which is vital for HSC functionality.

Can this method be used with other assays?

Yes, it can be combined with downstream assays like bone marrow transplantation and colony-forming assays.

What precautions should be taken during the process?

Minimize exposure to light after staining and be cautious with the use of methotrexate, as it can perturb ionic equilibrium.

What results can be observed using this protocol?

Increased mitochondrial membrane potential and evaluation of mitochondrial mass can be observed with the right treatments.

What technologies are key to this method?

Flow cytometry and fluorescent staining techniques are essential for the protocol.

Is visual demonstration of the method important?

Yes, visual demonstrations can help in understanding critical steps that are often omitted in traditional literature.

Hier beschreiben wir eine zuverlässige Methode zur Messung des mitochondrialen Massen- und Membranpotenzials in ex vivo kultivierten hämatopoetischen Stammzellen und T-Zellen.

Dieses Protokoll ist ein einfacher, auf Flusszytometrie basierender Assay, der die Messung des mitochondrialen Membranpotentials und der mitochondrialen Masse in lebenden Zellen ermöglicht. Standard-Metabolische Assays scheitern bei der Arbeit mit seltenen Populationen wie den hämatopoetischen Stammzellen. Diese Methode ermöglicht es Benutzern, mitochondriale Membranprofilierung bei der Arbeit mit einer geringen Anzahl von Zellen und neue metabolische Modulatoren von Zellen wie den HSCs zu bestimmen.

Darüber hinaus können Sie es mit nachgelagerten funktionellen Assays wie Knochenmarktransplantation oder koloniebildenden Assays kombinieren, um die Funktionalität Ihrer Zellen nach der Kultur zu bestimmen. Unsere Technik kann zur Identifizierung neuartiger Moleküle genutzt werden, die in der Lage sind, die HSC-Funktion im Zusammenhang mit Knochenmarktransplantationen und hämatopoetischer Immunrückgewinnung nach ablativen Therapien zu verbessern. Wie in unserem Protokoll beschrieben, kann unsere Methode verwendet werden, um die metabolische Fitness von Immun-T-Zellen zu bewerten.

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