Mitochondrial Measures in Primary Cells Isolated from Patients with ME/CFS

Abstract:

Fibroblasts and peripheral blood mononuclear cells (PBMCs) are commonly utilized cell types for the analysis of mitochondrial function. Fibroblasts, derived from connective tissue, provide a reliable model for studying mitochondrial metabolism due to their active role in energy production and their accessibility for experimental manipulations. PBMCs, on the other hand, are a heterogeneous population of immune cells that include lymphocytes and monocytes. They offer the advantage of reflecting mitochondrial function in circulating cells and providing insights into systemic aspects of mitochondrial biology. Both cell types can be cultured and treated with various substrates or stressors to assess parameters of mitochondrial function.

Here we describe the use of fibroblasts and PBMCs isolated from patients with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) to investigate mitochondrial abnormalities in the pathogenesis of this disease. Our techniques employ the use of fluorescent cellular dyes to measure mitochondrial mass, membrane potential and reactive oxygen species levels, luminescent measures of cellular NAD/NADH levels, and FRET-based measurements of the cellular and energy regulators, TORC1 and AMPK. These techniques are similarly useful for studying different physiological and pathological conditions.

Source: Allan CY, Katsaros T, Missailidis D, Fisher PR, Annesley SJ. Mitochondrial Measures in Primary Cells Isolated from Patients with ME/CFS. Methods Mol Biol. 2025;2920:203-223. doi: 10.1007/978-1-0716-4498-0_12. PMID: 40372685. https://link.springer.com/protocol/10.1007/978-1-0716-4498-0_12

Measuring Biomarkers of Oxidative Stress in ME/CFS Patients

Abstract:

Patients with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) have a deficiency in energy production as a result of dysfunctions in their mitochondrial metabolism, defects in the complexes of the electron transport chain, and in the regulation of reactive oxygen species (ROS). This can lead to an imbalance and excess of these species with subsequent modifications of proteins, lipids, and DNA.

Oxidative stress is defined as an accumulation of ROS due to a loss of regulation and the subsequent inability to detoxify them. The modifications to the cellular macromolecules by ROS can be used as biomarkers of oxidative stress and so have the potential to monitor the disease course of a condition like ME/CFS.

Proteins are especially vulnerable to oxidative stress as amino acid residues are naturally modified as part of cell signaling so, in an imbalance between ROS and antioxidants, proteins become modified at multiple sites potentially altering structure and function. Protein carbonyl modifications are stable and can be measured using 2,4-dinitrophenylhydrazine using a commercial ELISA assay. This has been applied here to immune cell proteins and plasma from ME/CFS patients who had moderate functional activity before and during an exercise protocol, and was shown to have potential as a marker of oxidative stress in these patients. The methods used to measure the DNA modification, 8-hydroxy-2′-deoxyguanosine (8-OHdG) are known to give varied results depending on the technology used.

Here, a commercial ELISA assay did not have the sensitivity to detect the modifications in the DNA before and during the exercise protocol of these ME/CFS patients.

Source: Walker M. Measuring Biomarkers of Oxidative Stress in ME/CFS Patients. Methods Mol Biol. 2025;2920:225-244. doi: 10.1007/978-1-0716-4498-0_13. PMID: 40372686. https://link.springer.com/protocol/10.1007/978-1-0716-4498-0_13

Measurement of Genetic Variations in ME/CFS Patients in the IDO2 Gene Encoding an Enzyme Metabolizing Tryptophan

Abstract:

Genetic variations in the indoleamine 2,3-dioxygenase (IDO2) gene that are commonly found in the general population have been assessed for their frequency in myalgic encephalomyelitis/chronic fatigue (ME/CFS) patients compared with healthy controls. They have potential for being genetic variations that lead to susceptibility to developing ME/CFS following exposure to a triggering stressor like a viral infection or other major stress events.

The IDO2 gene encodes an enzyme that is involved in the tryptophan-kynurenine pathway (TKP), and is activated if there are excessive amounts of tryptophan to prevent excessive serotonin production. The TKP pathway through production of NADH is involved in regulating the immune system and likely plays an important role in ME/CFS.

A simple method was developed to evaluate the 5 commonly occurring mutations in this gene in ME/CFS patients and to determine if one or more were present at higher frequency than in healthy controls. This might indicate a susceptibility factor for developing ME/CFS. In this chapter we describe the techniques used to isolate peripheral blood mononuclear cells (PBMCs), extract the DNA, and then do touchdown PCR and DNA sequencing for the analysis.

Source: Edgar CD, Blair A, Tate WP. Measurement of Genetic Variations in ME/CFS Patients in the IDO2 Gene Encoding an Enzyme Metabolizing Tryptophan. Methods Mol Biol. 2025;2920:247-256. doi: 10.1007/978-1-0716-4498-0_14. PMID: 40372687. https://link.springer.com/protocol/10.1007/978-1-0716-4498-0_14

Review of Neuroimaging Methods in ME/CFS

Abstract:

The brain is the most complex organ in the human body, and is involved in memory, speech, and movement, as well as regulating the functions of many other organs within the body. Various imaging techniques have detected subtle brain changes in vivo in ME/CFS. This chapter explores different neuroimaging studies used to investigate structural, functional, neurochemical, and tissue microstructural alterations in ME/CFS. These include magnetic resonance imaging (MRI), positron emission tomography (PET), and single photon emission computed tomography (SPECT).

Source: Thapaliya K, Inderyas M, Barnden L. Review of Neuroimaging Methods in ME/CFS. Methods Mol Biol. 2025;2920:257-277. doi: 10.1007/978-1-0716-4498-0_15. PMID: 40372688.  https://link.springer.com/protocol/10.1007/978-1-0716-4498-0_15

Cerebrospinal fluid immune phenotyping reveals distinct immunotypes of myalgic encephalomyelitis/chronic fatigue syndrome

Abstract:

Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a complex heterogeneous multiorgan disease that can have severe impact on individuals’ quality of life. Diagnosis of ME/CFS is based on symptom presentation, and a significant goal for the field is to establish meaningful subtypes. The heterogeneity in the literature suggests that individuals living with ME/CFS may suffer from overlapping but different underlying pathophysiological mechanisms.

We enrolled 40 participants with ME/CFS and 41 matched healthy control subjects at the Bragée Clinic in Sweden. We assessed plasma samples from both ME/CFS cases and control groups and cerebrospinal fluid (CSF) samples from individuals with ME/CFS.

We investigated dysregulated pathways and disease profiles through clinical questionnaires; multiplex analyses of cytokines, hormones, and matrix metalloproteinases; pathogen seroreactivity through peptide display bacteria libraries; and high-throughput microarray for autoantibodies. All samples used were from humans.

We show altered interaction patterns between circulating biological factors in plasma of ME/CFS participants. Our analysis of CSF from individuals with ME/CFS revealed different immunotypes of disease. We found 2 patient clusters based on matrix metalloproteinases profiles. The subgroups had similar clinical presentation but distinct pathogen exposure and CSF inflammatory profiles.

Our findings shed light on ME/CFS immune phenotypes and generate hypotheses for future research in disease pathogenesis and treatment development by exploring disease subgroups.

Source: Bastos VC, Greene KA, Tabachnikova A, Bhattacharjee B, Sjögren P, Bertilson B, Reifert J, Zhang M, Kamath K, Shon J, Gehlhausen JR, Guan L, VanElzakker M, Proal A, Bragée B, Iwasaki A. Cerebrospinal fluid immune phenotyping reveals distinct immunotypes of myalgic encephalomyelitis/chronic fatigue syndrome. J Immunol. 2025 May 15:vkaf087. doi: 10.1093/jimmun/vkaf087. Epub ahead of print. PMID: 40373264. https://academic.oup.com/jimmunol/advance-article/doi/10.1093/jimmun/vkaf087/8133211 (Full text)

Long-COVID in children and their parents: A prospective cohort study

Abstract:

Background: Long-COVID is a significant global health concern, regardless of age. However, few reports have longitudinally evaluated the characteristics, prevalence, and risk factors of long-COVID in children.

Methods: Participants were Japanese children younger than 18 years hospitalized for COVID-19 between November 2021 and October 2022, along with their COVID-19 affected parents. During hospitalization and at 1-, 3-, and 6-month follow-ups, participants completed age-appropriate questionnaires on long-COVID symptoms. The quality of life (QOL) score was assessed in children older than 2 years. The prevalence of long-COVID symptoms by age group was compared. Multivariable logistic regression analysis was conducted to investigate risk factors affecting long-COVID. Analysis of covariance adjusted for potential confounders was conducted to determine which symptoms affect QOL score.

Results: Of 108 children enrolled, the prevalence of long-COVID was 44.9%, 37.8%, and 22.8% at 1, 3, and 6 months, respectively, after SARS-CoV-2 infection. There were no specific risk factors for long-COVID. Cough, fatigue, and sleep disturbance were the most common long-COVID symptoms, with sleep disturbance associated with a change in lower QOL score from admission at all three follow-ups (mean difference 9.25, 20.15, and 19.81; 95% CI, 1.58-16.91, 3.38-36.92, and 5.51-34.11). The prevalence of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) symptoms among 0-6 years was significantly lower than among 7-17 years and parents; there was no significant difference between 7 and 17 years and parents.

Conclusion: Even 6 months after SARS-CoV-2 infection, 22.8% of pediatric patients still had long-COVID symptoms. Some of these symptoms were similar to those of ME/CFS, potentially affecting children’s QOL.

Source: Iijima H, Funaki T, Kubota M. Long-COVID in children and their parents: A prospective cohort study. Pediatr Int. 2025 Jan-Dec;67(1):e70042. doi: 10.1111/ped.70042. PMID: 40351239. https://onlinelibrary.wiley.com/doi/full/10.1111/ped.70042 (Full text)

The potential therapeutic approaches targeting gut health in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS): a narrative review

Abstract:

Background: Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) is a complex disorder characterized by persistent fatigue and cognitive impairments, with emerging evidence highlighting the role of gut health in its pathophysiology. The main objective of this review was to synthesize qualitative and quantitative data from research examining the gut microbiota composition, inflammatory markers, and therapeutic outcomes of interventions targeting the microbiome in the context of ME/CFS.

Methods: The data collection involved a detailed search of peer-reviewed English literature from January 1995 to January 2025, focusing on studies related to the microbiome and ME/CFS. This comprehensive search utilized databases such as PubMed, Scopus, and Web of Science, with keywords including “ME/CFS,” “Gut-Brain Axis,” “Gut Health,” “Intestinal Dysbiosis,” “Microbiome Dysbiosis,” “Pathophysiology,” and “Therapeutic Approaches.” Where possible, insights from clinical trials and observational studies were included to enrich the findings. A narrative synthesis method was also employed to effectively organize and present these findings.

Results: The study found notable changes in the gut microbiota diversity and composition in ME/CFS patients, contributing to systemic inflammation and worsening cognitive and physical impairments. As a result, various microbiome interventions like probiotics, prebiotics, specific diets, supplements, fecal microbiota transplantation, pharmacological interventions, improved sleep, and moderate exercise training are potential therapeutic strategies that merit further exploration.

Conclusions: Interventions focusing on the gut-brain axis may help reduce neuropsychiatric symptoms in ME/CFS by utilizing the benefits of the microbiome. Therefore, identifying beneficial microbiome elements and incorporating their assessments into clinical practice can enhance patient care through personalized treatments. Due to the complexity of ME/CFS, which involves genetic, environmental, and microbial factors, a multidisciplinary approach is also necessary. Since current research lacks comprehensive insights into how gut health might aid ME/CFS treatment, standardized diagnostics and longitudinal studies could foster innovative therapies, potentially improving quality of life and symptom management for those affected.

Source: Hsu CY, Ahmad I, Maya RW, Abass MA, Gupta J, Singh A, Joshi KK, Premkumar J, Sahoo S, Khosravi M. The potential therapeutic approaches targeting gut health in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS): a narrative review. J Transl Med. 2025 May 11;23(1):530. doi: 10.1186/s12967-025-06527-x. PMID: 40350437. https://translational-medicine.biomedcentral.com/articles/10.1186/s12967-025-06527-x (Full text)

The gut microbiota promotes pain in fibromyalgia

Highlights:

• Transplanting gut microbiota from women with fibromyalgia into mice induces pain
• It also induces immune activation, metabolomic changes, and reduced skin innervation
• Gut microbiota promotes pain through several mechanisms
Summary:

Fibromyalgia is a prevalent syndrome characterized by widespread pain in the absence of evident tissue injury or pathology, making it one of the most mysterious chronic pain conditions. The composition of the gut microbiota in individuals with fibromyalgia differs from that of healthy controls, but its functional role in the syndrome is unknown. Here, we show that fecal microbiota transplantation from fibromyalgia patients, but not from healthy controls, into germ-free mice induces pain and numerous molecular phenotypes that parallel known changes in fibromyalgia patients, including immune activation and metabolomic profile alterations. Replacing the fibromyalgia microbiota with a healthy microbiota substantially alleviated pain in mice. An open-label trial in women with fibromyalgia (Registry MOH_2021-11-04_010374) showed that transplantation of a healthy microbiota is associated with reduced pain and improved quality of life. We conclude that altered gut microbiota has a role in fibromyalgia pain, highlighting it as a promising target for therapeutic interventions.
Source: Cai W, Haddad M, Haddad R, Kesten I, Hoffman T, Laan R, Westfall S, Defaye M, Abdullah NS, Wong C, Brown N, Tansley S, Lister KC, Hooshmandi M, Wang F, Lorenzo LE, Hovhannisyan V, Ho-Tieng D, Kumar V, Sharif B, Thurairajah B, Fan J, Sahar T, Clayton C, Wu N, Zhang J, Bar-Yoseph H, Pitashny M, Krock E, Mogil JS, Prager-Khoutorsky M, Séguéla P, Altier C, King IL, De Koninck Y, Brereton NJB, Gonzalez E, Shir Y, Minerbi A, Khoutorsky A. The gut microbiota promotes pain in fibromyalgia. Neuron. 2025 Apr 18:S0896-6273(25)00252-1. doi: 10.1016/j.neuron.2025.03.032. Epub ahead of print. PMID: 40280127. https://www.cell.com/neuron/fulltext/S0896-6273(25)00252-1 (Full text)

Health-related quality of life in people with ME and Long Covid: A conversation with Breanna Weigel, Griffith University, Australia

By Dylan Murphy

In March 2024 the UN Disabilities Committee issued a damning report which stated that disabled people in the UK faced systemic violations of their human rights ranging from cuts to benefits to the lack of housing for disabled people. Fast forward to late February 2025 and the UN Economic and Cultural Committee issued a report on the UK which criticized the Labour government for its failures to reduce poverty and social inequality. Since then our government in its infinite wisdom has decided to slash £7 billion from disability benefits and is removing free bus passes from hundreds of thousands of disabled people on PIP.

On the ME front our government has engaged in endless gas lighting postponing the Department of Health care plan for ME several times. It claims that the care plan for ME will be published sometime in June just when it is due to announce major cuts to public spending which makes it very unlikely that it will put any resources into funding this plan.

In 2017 I put in a freedom of information request to the DWP which revealed that a third of pwME applying for PIP were having their applications turned down. The DWP is of course completely ignorant of the heavy disease burden of ME on those suffering with this wretched illness. It chooses to ignore the wealth of scientific evidence revealing the low quality of life outcomes for pwME.

In light of the above developments I came across a recent research paper, Health-related quality of life in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome and Post COVID-19 Condition: A systematic review, by a group of scientists from the  National Centre for Neuroimmunology and Emerging Diseases (NCNED) at Griffith University, Australia.

One of the co-authors of the above paper, Breanna Weigel, took time out from her busy schedule to talk to me about this important piece of research which may be of value to those pwME navigating the treacherous waters which are our current benefits system. It was such a pleasure to talk to a passionate young scientist who is so committed to the field of ME/Long Covid research. Breanna told me, “ It is a privilege to share these findings with the ME and Long COVID community, who have had an immeasurable impact on my growth as a researcher and my passion for making a difference for people who live with these chronic illness.’’

Breanna Weigel has five years’ experience working in the field of ME/CFS and Long COVID research at the National Centre for Neuroimmunology and Emerging Diseases (NCNED), Griffith University, Gold Coast, Australia. This month, Breanna will be submitting her PhD thesis, titled “Living with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome and Long COVID in Australia: An examination of illness experiences and healthcare policy”.

DM: How did you get involved in the field of ME research?

BW: Chronic illness has been an important part of my life and an area that I have wanted to work in for a long time. My Mum has lived with a chronic illness that has affected her life every day for the last 23 years. Seeing the extensive impacts that this had on my Mum, I was motivated to pursue a career that enabled me to contribute to helping people with chronic illness. I also developed a chronic illness four years ago, which considerably disrupted my life. However, my own lived experiences have provided me with additional insight that has informed my approach to research.

My involvement in ME research commenced in 2019 during my search for a supervisor for my Honours project. As I had a strong interest in public health and epidemiology, my program advisor shared with me the public health research that was being conducted at the National Centre for Neuroimmunology and Emerging Diseases (NCNED) and put me in contact with Prof Sonya Marshall-Gradisnik. It was then that I was introduced to the world of ME research.

I have continued to work with the NCNED over the last five years and I am presently finalising my PhD thesis, which highlights the lived experiences of people with ME and people with Post COVID-19 Condition (PCC). Throughout my early research career, I have had the invaluable opportunity to work directly with people who live with these conditions. Hearing their stories and experiences of living with ME or PCC has strengthened my motivation to make a difference for people who live with chronic illnesses that affect so many aspects of life.

DM: In the paper you co-authored, “Health-related quality of life in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome and Post COVID-19 Condition: A systematic review”, you make the following observation: “people with ME/CFS (pwME/CFS) and people with PCC (pwPCC) are often precluded from accessing necessary disability and social support services. These unmet care needs exacerbate the existing illness burdens experienced by pwME/CFS and pwPCC.’’

This is a very timely and astute observation.

In October 2023 the Department of Health UK held a public consultation regarding its plans to improve the quality of life for people with ME, which admitted that people with ME face many difficulties accessing disability and social care services. Now we face huge cuts to disability benefits such as Personal Independence Payment (PIP), which many people with ME claim to help them with the extra costs of being disabled. Due to the fluctuating nature of the illness many people with ME have problems claiming disability benefits and accessing social care services.

Bearing this in mind can you explain the purpose of your systematic review?

BW: Unfortunately, many people with ME and people with PCC face similar barriers to receiving such necessary support in Australia. Based on results in my Honours and PhD research, approximately half of the people with ME who participated in these studies and were unable to work due to their illness were not receiving income support through the Disability Support Pension (DSP), which is our federally funded income assistance program here in Australia.

A primary barrier to accessing this necessary support for Australians who live with ME or PCC is the lack of recognition for these illnesses as real, physical disabilities in healthcare policy. The purpose of our recently published systematic review was, therefore, to elucidate that the profound impacts of ME and PCC on the health and functioning of people who live with these conditions warrant access to care and support services, such as the DSP.

The systematic review method enabled all relevant studies published worldwide to be included in the analysis. By examining all the existing relevant literature, this systematic review not only provided evidence that ME and PCC are associated with significantly lower quality of life when compared with healthy people, but also indicated that these findings are consistent across studies, countries and time.

DM: Sadly, pwME over many years have suffered from a dismissive and discriminatory attitude from many health professionals and media outlets with their illness being dismissed as psychosomatic in nature. Here in the UK, we still have some of the royal medical colleges maintaining that psychological therapies are an appropriate treatment for pwME. Many people with Long COVID are facing similar negative attitudes towards their illness. Based on the extensive research which you carried out for your systematic review, how would you characterize ME and Long COVID: Are they physical or psychological illnesses?

BW: The findings of our recent systematic review reiterate that ME and PCC are real, physical illnesses that are not psychogenic in nature. I use the term, “PCC”, here as our systematic review specifically examined publications documenting quality of life among people with persistent COVID-19-related symptoms for at least three months, which is consistent with the World Health Organization’s definition of “Post COVID-19 Condition” (PCC).

Importantly, the illness impact trends observed across the studies analyzed in our systematic review highlight that physical health and the ability to complete daily activities are consistently the most substantially impacted components of quality of life among people with ME and people with PCC. In addition, mental health was consistently the least impacted component of quality of life among these two cohorts. These findings affirm that, whilst living with an invisible and incurable chronic illness can have significant mental health repercussions, these impacts are secondary to and not causative of ME or PCC.

This conclusion is supported by the extensive literature documenting disruptions to cellular functioning among people with ME and people with PCC. This includes the world-first research from the NCNED. Laboratory-based studies from our Centre have consistently identified impaired TRPM3 calcium ion channel function among people * with ME and people with PCC, in which these impairments are absent in healthy people. * see footnote for explanation of this term.

DM: People with ME suffer from a multitude of symptoms which have a very debilitating and disabling impact on their lives. Can you explain the disabling impact of the illness on people with ME and its long-term impact on them? Do people with Long COVID suffer from the same issues?

BW: Our systematic review, for the first time, provides consistent evidence of the shared widespread impact of ME and PCC on the health and well being of people with these conditions. Overall health, as well as all individual aspects of health and functioning, are considerably poorer among pwME and pwPCC when compared with healthy people.

In conjunction with the results of two other studies that contribute to my PhD project (which were published in 2024 [1, 2]) and the NCNED’s laboratory findings [3, 4], the illness impact patterns observed in our systematic review indicate that the collection of post-COVID-19 sequelae (an after effect of a disease, condition, or injury)  includes an illness presentation that is highly reminiscent of ME.

Combined with the post-viral nature of a considerable proportion of ME cases, this suggests that, after an episode of COVID-19, some people may experience the typical illness trajectory of people with ME. Hence, people who experience ME-like illness after COVID-19 may be at risk of long-term, complex chronic illness associated with widespread and debilitating symptoms, profound limitations on their ability to participate in daily, work and social life, and high healthcare needs.

DM: During the discussion section of your paper, you observe that pwME and people with Long COVID suffer from a comparable, profound level of disability. You note that “the illness presentation of ME/CFS and PCC poses a considerable barrier to completing physical tasks associated with daily living, …’’ Can you please explain this observation with examples from your research?

BW: The ability to participate in typical daily activities was consistently one of the most impacted components of health and functioning across the studies captured in our systematic review. In the context of the patient-reported outcome measures that were used to collect data in these studies, this refers to the ability to complete work both around the home and in relation to employment or study.

Such patient-reported outcome measures used by the studies included in our systematic review (and used in our studies at the NCNED) quantify quality of life and functioning across a range of scales. These include scales that consider overall health, as well as collections of more specific scales that focus on individual aspects of health. In terms of overall health, our research indicates that most people with ME/CFS and people with PCC have a functional status between 30% and 50% of total functioning. This is significantly lower than the level of functioning of healthy people, who typically return a score of (or close to) 100%.

Overall health status scores between 30% and 50% represent a considerable impact on the ability to complete daily activities, such as only being able to complete a limited number of tasks (like housework or grocery shopping) per day with adequate rest periods. However, people experiencing severe illness can return overall health status scores of 20% or 10%. People who return these considerably low scores may be mostly bed bound and unable to shower or eat independently.

The consistent finding that people with ME and people with PCC have a profoundly impaired ability to perform typical daily activities (including being able to continue employment) in our systematic review is critical in relation to guiding care and support access. As these impairments were repeatedly observed through the collection of data by validated and standardised patient-reported outcome measures, this provides evidence that ME and PCC are real, disabling conditions and must be considered eligible for care and support services, such as income assistance.”

DM:  Your study is the first systematic review to capture and compare quality of life metrics for both pwME and people suffering from Long COVID. In your paper, you state “The present systematic review therefore serves to elucidate the pervasive impacts of ME/CFS and PCC on people who live with these conditions to inform and guide healthcare policy reform, as well as future research.” What recommendations would you suggest to public health agencies and governments to help pwME and Long COVID have a better quality of life?

BW: The co-production of healthcare policies and services with ME and PCC consumers will be an essential step in improving quality of life for people who live with these conditions. Importantly, care accessibility must be increased for these cohorts and the processes of accessing care must accommodate for the functional limitations of people who live with ME or PCC.

DM: I had the opportunity to further discuss the role of consumers’ lived illness experiences in shaping healthcare policy in my recent collaboration with the Deeble Institute for Health Policy Research, Australian Healthcare and Hospitals Association, which can be accessed via this link: https://doi.org/10.25916/b246-r560

BW: If anyone has any questions after reading the interview or would like to discuss our research in general, they are more than welcome to contact us at ncned@griffith.edu.au

References:
1. Weigel B, Eaton-Fitch N, Thapaliya K, & Marshall-Gradisnik SM. Illness presentation and quality of life in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome and Post COVID-19 Condition: A pilot Australian cross-sectional study. Qual Life Res. 2024,33(9):2489–507. doi: 10.1007/s11136-024-03710-3.
2. Weigel B, Eaton-Fitch N, Thapaliya K, & Marshall-Gradisnik SM. A pilot cross-sectional investigation of symptom clusters and associations with patient-reported outcomes in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome and Post COVID-19 Condition. Qual Life Res. 2024,33(12):3229–43. doi: 10.1007/s11136-024-03794-x.
3. Martini Sasso E, Muraki K, Eaton-Fitch N, Smith P, Lesslar OL, Deed G, et al. Transient receptor potential melastatin 3 dysfunction in Post COVID-19 Condition and Myalgic Encephalomyelitis/Chronic Fatigue Syndrome patients. Mol Med. 2022,28(1):98. doi: 10.1186/s10020-022-00528-y.
4. Martini Sasso E, Muraki K, Eaton-Fitch N, Smith P, Jeremijenko A, Griffin P, et al. Investigation into the restoration of TRPM3 ion channel activity in Post-COVID-19 Condition: A potential pharmacotherapeutic target. Front Immunol. 2024,15:1264702. doi: 10.3389/fimmu.2024.1264702.

Glossary

* What is TRPM3? Imagine TRPM3 as a tiny “gate” on the surface of cells. This gate specializes in allowing calcium ions (charged particles) to flow into the cell when triggered. Calcium acts like a messenger, telling the cell to perform specific tasks.

How Does It Work? 

Triggers: The TRPM3 gate opens in response to certain signals, such as heat (like a body temperature rise) or specific molecules (like those released when you’re injured or when blood sugar is high). – Calcium’s Role: Once the gate opens, calcium rushes in, acting like a text message that alerts the cell to take action. This could mean sending a pain signal, releasing hormones, or adjusting to temperature changes.

1. Calcium Signaling & Cellular Stress: What’s Happening?

TRPM3 allows calcium to enter cells, which is critical for communication between nerves, muscles, and the immune system. In ME/CFS, abnormal calcium flow might disrupt this communication.

Impact: Too much calcium in cells (due to overactive TRPM3) could cause “cellular stress,” damaging mitochondria (the cell’s energy factories) or overstimulating nerves. This might explain the fatigue, muscle weakness, and “brain fog” seen in ME/CFS.

2. Pain Sensitivity & Nervous System Overdrive – What’s Happening?

TRPM3 helps nerves detect pain and temperature. If it’s hypersensitive, it might send constant “false alarms” to the brain.

Impact: This could contribute to chronic pain, allodynia (pain from light touch), or temperature intolerance (feeling too hot/cold) common in ME/CFS. It might also worsen “sensory overload,” where lights, sounds, or movement feel overwhelming.

3. Immune System & Inflammation – What’s Happening?

TRPM3 is activated by inflammatory molecules. In ME/CFS, chronic inflammation or immune dysfunction (e.g., after infections like Epstein-Barr virus) might keep TRPM3 stuck in the “on” position.

Impact: This could lead to a vicious cycle: inflammation → TRPM3 overactivity → more inflammation → worsened symptoms. Studies show ME/CFS patients often have abnormal immune cells (like natural killer cells), and TRPM3 defects in these cells might impair their ability to fight infections.

4. Energy Metabolism & Crashes – What’s Happening?

TRPM3 helps regulate insulin release and cellular energy. If it malfunctions, cells might struggle to manage glucose (sugar) for energy.

Impact: This could worsen energy crashes (post-exertional malaise) and contribute to the “dead battery” feeling in ME/CFS. Poor calcium regulation in muscles might also explain why even mild activity leads to severe fatigue.

5. The Bigger Picture: A Key Piece of the Puzzle?

ME/CFS is likely caused by a mix of genetic, immune, and environmental factors. TRPM3 dysfunction could be one piece of this puzzle. For example: – Genetic mutations in TRPM3 might make some people more prone to ME/CFS.

Viral infections or toxins could “break” TRPM3, triggering symptoms.

Overactive TRPM3 in the brain might disrupt sleep/wake cycles or hormone regulation.

Hope for Treatments? Researchers are exploring drugs that target TRPM3 to: ✅ Calm overactive channels (e.g., using blockers like primidone or certain antidepressants). ✅ Reduce inflammation linked to TRPM3 activation. ✅ Improve cellular energy by restoring calcium balance. However, this is still experimental—no treatments exist yet specifically for TRPM3 in ME/CFS.

Key Takeaway: TRPM3’s role in ME/CFS highlights how tiny cellular “gates” can have big impacts on fatigue, pain, and immune function. While more research is needed

HERV activation segregates ME/CFS from fibromyalgia while defining a novel nosologic entity

Abstract:

Research of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) and fibromyalgia (FM), two acquired chronic illnesses affecting mainly females, has failed to ascertain their frequent co-appearance and etiology. Despite prior detection of human endogenous retrovirus (HERV) activation in these diseases, the potential biomarker value of HERV expression profiles for their diagnosis, and the relationship of HERV expression profiles with patient immune systems and symptoms had remained unexplored.

By using HERV-V3 high-density microarrays (including over 350k HERV elements and more than 1500 immune-related genes) to interrogate the transcriptomes of peripheral blood mononuclear cells from female patients diagnosed with ME/CFS, FM, or both, and matched healthy controls (n = 43), this study fills this gap of knowledge. Hierarchical clustering of HERV expression profiles strikingly allowed perfect participant assignment into four distinct groups: ME/CFS, FM, co-diagnosed, or healthy, pointing at a potent biomarker value of HERV expression profiles to differentiate between these hard-to-diagnose chronic syndromes.

Differentially expressed HERV-immune-gene modules revealed unique profiles for each of the four study groups and highlighting decreased γδ T cells, and increased plasma and resting CD4 memory T cells, correlating with patient symptom severity in ME/CFS. Moreover, activation of HERV sequences coincided with enrichment of binding sequences targeted by transcription factors which recruit SETDB1 and TRIM28, two known epigenetic silencers of HERV, in ME/CFS, offering a mechanistic explanation for the findings.

Unexpectedly, HERV expression profiles appeared minimally affected in co-diagnosed patients denoting a new nosological entity with low epigenetic impact, a seemingly relevant aspect for the diagnosis and treatment of this prevalent group of patients.

Source: Giménez-Orenga K, Martín-Martínez E, Nathanson L, Oltra E. HERV activation segregates ME/CFS from fibromyalgia while defining a novel nosologic entity. Elife. 2025 May 8;14:RP104441. doi: 10.7554/eLife.104441. PMID: 40338225. https://elifesciences.org/articles/104441 (Full text)