dissertation – American ME and CFS Society

Abstract;

Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) is a chronic and incapacitating multisystem condition with unknown etiology, no cure, and no FDA- approved treatments, all of which can be attributed to historical underfunding, widespread misinformation, and the complexity of the disease. Many patients encounter several immune-related symptoms, extreme fatigue, post-exertional malaise, and a flu-like onset. Studies have documented changes in ME/CFS immune cell populations and decreased natural killer (NK) cell performance, along with aberrant cytokine production, reduced glycolysis in T cells, and altered metabolites relevant to fatty acid oxidation, implicating potential intracellular metabolic dysregulation.

This knowledge prompted me to investigate fatty acid oxidation and immune cell functional states in isolated ME/CFS lymphocytes. Using extracellular flux analysis and flow cytometry, I observed elevated fatty acid oxidation levels in ME/CFS immune cells, including NK cells, CD4+ memory cells, CD4+ effector cells, CD8+ naïve cells, and CD8+ memory cells compared to healthy controls, particularly during high energy demands and activation. My findings suggest a metabolic dysfunction in ME/CFS immune cells, consistent with T cell exhaustion – a state that hinders immune cell proliferation, survival, and cytokine production following persistent antigen stimulation.

Building upon these results, I further investigated immune cell exhaustion and dysfunction in isolated CD8+ and CD4+ T cells from ME/CFS and healthy samples. I analyzed T cell sub-populations, including naïve, effector, memory, regulatory, and helper T cells, for frequencies of inhibitory receptors and transcription factors associated with dysfunctional immune cell states.

I detected distinct transcription factor dynamics and elevated exhausted T cell phenotype proportions in ME/CFS CD8+ T cell populations compared to healthy controls. In ME/CFS CD4+ T cells, I also observed altered inhibitory receptor population frequencies compared to healthy control samples. Moreover, dysfunctional T cell features correlated with ME/CFS health status and symptom presentation.

Overall, my findings detect dysfunctional T cell states in specific ME/CFS cell populations, which can lead to reduced effector function that may contribute to ME/CFS symptom presentation. This work highlights the significance of assessing both metabolic components and immune cell dysfunction-associated targets in the development of potential therapeutic interventions for individuals with ME/CFS.

Source: Maya, Jessica. Immune cell exhaustion, dysfunction, and metabolism in myalgic encephalomyelitis/chronic fatigue syndrome. Cornell Theses and Dissertations. 2024. https://ecommons.cornell.edu/items/242f8723-6f87-47cc-b36d-bf51a21f4255

Abstract:

Myalgic Encephalomyelitis/ Chronic Fatigue Syndrome (ME/CFS) is a complex chronic medical condition, affecting up to 2% of secondary school aged children in the UK (Collard & Murphy, 2020). It is an illness that has historically been contested and is widely misunderstood, contributing to negative stereotyping and stigma (Blease et al, 2017). Together with the physical symptoms of a complex illness, this has significant implications for the school experiences of young people with ME/CFS.
Using a social constructionist framework that recognises that knowledge creation is a shared enterprise, this research adopts a social justice perspective, which shapes the entirety of the research process.

Adopting Narrative Inquiry as a methodology, this study explores the stories constructed by three young people with ME/CFS, aged between sixteen and seventeen, in relation to their school experiences. The young people used audio or written diaries to construct their narratives and participate in an optional follow up reflective interview.

The young people’s narratives were analysed using the Listening Guide (Brown & Gilligan, 1993), a ‘Voice Centred Relational Method’, revealing the complex, unique and subjective nature of individual experience. Bronfenbrenner’s ecological systems theory (1979) and Ryan and Deci’s Self-determination theory (2017) were used as explanatory frameworks to illustrate the findings, which indicated that understanding, communication and flexibility of adaptations were key factors shaping the young people’s experiences of school. A model for practice has been created for Educational Psychologists to consider using with schools, in order to identify factors within the young people’s environmental systems that could be addressed to promote a positive school experience.

This dissertation concludes with considerations of how narrative approaches can be used to guide the work of Educational Psychologists. Implications for professional practice have been shared, highlighting the importance of viewing the needs of young people with ME/CFS holistically, and adopting a person-centred approach.

Source: Lewis, Mariana L. A narrative inquiry into the school experiences of teenagers living with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS). Educational Psychology Thesis (DEdPsy). University of Bristol. https://research-information.bris.ac.uk/ws/portalfiles/portal/349168131/Final_Copy_2022_12_06_Lewis_M_L_DEdPsy.pdf (Full text)