I think it very likely that whatever is wrong in ME/CFS is something we do not have any means to measure at present
The tools might be coming though. One recent new technique to look at immune cell metabolism is SCENITH, which is an advance on Seahorse —
SCENITH: A Flow Cytometry-Based Method to Functionally Profile Energy Metabolism with Single-Cell Resolution (2020)
Rafael J. Argüello; Alexis J. Combes; Remy Char; Julien-Paul Gigan; Ania I. Baaziz; Evens Bousiquot; Voahirana Camosseto; Bushra Samad; Jessica Tsui; Peter Yan; Sebastien Boissonneau; Dominique Figarella-Branger; Evelina Gatti; Emeline Tabouret; Matthew F. Krummel; Philippe Pierre
Energetic metabolism reprogramming is critical for cancer and immune responses. Current methods to func- tionally profile the global metabolic capacities and dependencies of cells are performed in bulk.
We designed a simple method for complex metabolic profiling called SCENITH, for single-cell energetic metabolism by profiling translation inhibition. SCENITH allows for the study of metabolic responses in multiple cell types in parallel by flow cytometry. SCENITH is designed to perform metabolic studies ex vivo, particularly for rare cells in whole blood samples, avoiding metabolic biases introduced by culture media. We analyzed myeloid cells in solid tumors from patients and identified variable metabolic profiles, in ways that are not linked to their lineage or their activation phenotype.
SCENITH’s ability to reveal global metabolic functions and determine complex and linked immune-phenotypes in rare cell subpopulations will contribute to the information needed for evaluating therapeutic responses or patient stratification.
Link |
PDF (Cell Metabolism)
Used for example in dendritic cells —
Distinct metabolic states guide maturation of inflammatory and tolerogenic dendritic cells (2022)
Adamik, Juraj; Munson, Paul V.; Hartmann, Felix J.; Combes, Alexis J.; Pierre, Philippe; Krummel, Matthew F.; Bendall, Sean C.; Argüello, Rafael J.; Butterfield, Lisa H.
Cellular metabolism underpins immune cell functionality, yet our understanding of metabolic influences in human dendritic cell biology and their ability to orchestrate immune responses is poorly developed.
Here, we map single-cell metabolic states and immune profiles of inflammatory and tolerogenic monocytic dendritic cells using recently developed multiparametric approaches. Single-cell metabolic pathway activation scores reveal simultaneous engagement of multiple metabolic pathways in distinct monocytic dendritic cell differentiation stages. GM-CSF/IL4-induce rapid reprogramming of glycolytic monocytes and transient co-activation of mitochondrial pathways followed by TLR4-dependent maturation of dendritic cells. Skewing of the mTOR:AMPK phosphorylation balance and upregulation of OXPHOS, glycolytic and fatty acid oxidation metabolism underpin metabolic hyperactivity and an immunosuppressive phenotype of tolerogenic dendritic cells, which exhibit maturation-resistance and a de-differentiated immune phenotype marked by unique immunoregulatory receptor signatures.
This single-cell dataset provides important insights into metabolic pathways impacting the immune profiles of human dendritic cells.
Link |
PDF (Nature Communications) [Open Access]