Biomarker research: The maintained attention assessment in patients affected by ME/CFS

The maintained attention assessment in patients affected by Myalgic encephalomyelitis/ chronic fatigue syndrome: A reliable biomarker?, by Inigo Murga, Larraitz Aranburu, Pascual A Gargiulo, Juan-Carlos Gomez-Esteban, Jose-Vicente Lafuente in Journal of Translational Medicine Vol 19, #1, p 494, December 4, 2021

 

Research abstract

The maintained attention is the cause of great functional limitations in CFS/ME, a disease that mainly affects women in the central period of life. Cognitive function is explored using the Montreal Cognitive Assessment, the maintained attention using the Toulouse-Pieron test with which the Global Index of Attention and Perception (GIAP) is obtained, the fatigue using the visual analog scale and the perception of effort using the modified Borg scale.

The final sample were 84 patients (66 women/18 men) who met diagnostic criteria (Fukuda-1994, Carruthers-2011) and 22 healthy controls (14 women/8 men). Most of patients maintain normal cognitive function, showing low or very low attention score in the 70% of patients with a marked cognitive fatigue compared to the control group (p<0.05).

There were no significant differences between genders in GIAP or fatigue for CFS/ME; however, sick women perceive cognitive effort higher than men. Deficits in sustained attention and the perception of fatigue, so effort after performing the proposed test are a sensitive and reliable indicator that allows us to substantiate a clinical suspicion and refer patients for further studies in order to confirm or rule out CFS/ME.

Conclusion

General cognition remains preserved in most patients, only a small group of them shows a significant mild cognitive impairment. Maintained attention is clearly deficient, showing a marked fatigability after the Toulouse-Piéron test. The effort was perceived as very hard by both gender, but higher by women.

This study proposes a simple clinical way to assess maintained attention. Present results support the reliability of maintained attention as biomarker of CFS/ME. Attention deficit is a significant disability in patients affected of central fatigue.

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Hidden from sight: why the complexity of ME/CFS needs to be recognised by policy makers

Hidden from Sight: Why the complexity of ME/CFS needs to be recognised by policy makers, by Tomruk Ustunkaya and Richard Machin, by People, Place and Policy Vol 15, #2, pp. 91-99, November 2021

 

Background:

An estimated 260,000 people in the UK are living with Myalgic Encephalomyelitis/ Chronic Fatigue Syndrome (ME/CFS); this neurological condition has been described as

‘a serious, chronic, complex, and multisystem disease that frequently and dramatically limits the activities of affected patients’ (Institute of Medicine, 2015).

Despite this, there remains a lack of clarity about the diagnosis and treatment of ME/CFS. The authors of this paper refer to ME/CFS but recognise that other terms (for example systemic exertion intolerance disease, chronic fatigue immunity deficiency syndrome, and post-viral fatigue syndrome) are used to describe this neurological condition, and for some people these are preferred names. This paper adopts the definition of ME/CFS as a neurological condition of unknown origin as defined by the World Health Organisation and accepted by the UK Department of Health (WHO, n.d.).

The House of Commons debate which took place on 21 June 2018 will be taken as a significant starting point for the discussion on ME treatment and research; this is regarded as a key moment in the public debate and recognition of the condition stating that ME is ‘a hidden illness’ (Hansard HC Deb., 21 June 2018d).

Historically, there has been an emphasis on ME/CFS as being psychological in nature and this continues to exert a damaging influence on key areas of public policy. This paper considers the hidden nature of ME/CFS in relation to two particular issues: funding for research and social security policy.

  1. It is argued that medical research into the condition is impeded by a lack of adequate government funding. This is identified as critical in achieving a comprehensive health regime for sufferers.
  2. Social security is an important area of concern for ME/CFS suffers and a key policy area; correct entitlement to social security benefits is crucial for people with disabilities but appropriate access to welfare benefits is often obstructed by misunderstanding of the condition.

It is argued that in both of these areas, a greater understanding of the impact of ME/CFS is required to allow policy makers and practitioners to more appropriately meet the needs of people living with the condition.

Conclusion

Clarity is paramount to bring ME/CFS out from the ‘invisible’ sphere in terms of both the treatment and definitions of the illness, and the ways in which the condition is
understood by government departments, institutions, and society. This clarity will be
difficult to attain without adequate funding for research into the illness and may explain the ongoing preference for psychological treatments.

The emergence of post-COVID syndrome (long-COVID) has emphasised how important it is to appropriately fund research into long-term and debilitating conditions. Interestingly, the Department for Work and Pensions have issued new guidance stating that children suffering with post-COVID syndrome can be awarded disability benefit for a period of 12 months (DWP, 2021); this has provided the type of clarity that is lacking for ME/CFS patients. The authors of this paper recognise the challenges that a lack of funding presents for the treatment of the condition and are supportive of the medical profession and the on-going medical support provided to ME/CFS patients.

For those members of society with greatly reduced quality of lives due to the
challenges presented by ME/CFS, it is clear that public policy and bureaucratic decision-making processes must respond more appropriately to their needs. Positive government intervention is necessary to end the uncertainty for ME/CFS patients. The human cost of policy failure for people with ME/CFS is paramount; however, the financial costs are also significant. A study estimated that the total cost of ME/CFS to the UK economy is £3.3 billion per year, or only £16,966 per person living with the condition (Hunter et al., 2017).

These figures underscore the importance of providing adequate funding for treatment
and a functioning social security safety net. Until the WHO classification of ME/CFS as a neurological condition is fully recognised by policy makers, we will continue to see challenges for patients, not only in terms of funding for treatment and social security which have been examined in this paper, but across the full spectrum of public policy. ME/CFS patients experience ‘multiple pathophysiological changes that affect multiple systems’ (Centers for Disease Control, 2018). Policy makers must recognise the severity of the condition to make appropriate responses to it.

The hidden nature of this condition can be linked to an absence of a biomarker and
because uncertainty surrounds it medically and in society. However, this should not
mean that the needs of ME/CFS patients are overlooked or marginalised; the challenges presented by the condition are a reality for patients and their families. Patients are entitled to expect appropriate support from the Department of Health, Department for Work and Pensions, employers, and educational establishments.

The words of Alex Chalk, MP, (Hansard HC Deb., 21 June 2018c) offer hope for a future characterised by a determined, active effort to help

“I conclude by paying tribute to the silent sufferers of this cruel disease in our country. Let the word go out from the House of Commons: they shall be silent no longer”.

Read the full paper

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Subgroup research: Tryptophan metabolites, cytokines & FAPB-2 in ME/CFS

Tryptophan metabolites, cytokines, and fatty acid binding protein 2 in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome, by Manuela Simonato, Stefano Dall’Acqua, Caterina Zilli, Stefania Sut, Romano Tenconi, Nicoletta Gallo, Paolo Sfriso, Leonardo Sartori, Francesco Cavallin, Ugo Fiocco, Paola Cogo, Paolo Agostinis, Anna Aldovini, Daniela Bruttomesso, Renzo Marcolongo, Stefano Comai and Aldo Baritussio in Biomedicines 2021, 9(11), 1724 [doi.org/10.3390/biomedicines9111724]

 

Research abstract:

Patients with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) differ for triggers, mode of start, associated symptoms, evolution, and biochemical traits. Therefore, serious attempts are underway to partition them into subgroups useful for a personalized medicine approach to the disease.

Here, we investigated clinical and biochemical traits in 40 ME/CFS patients and 40 sex- and age-matched healthy controls. Particularly, we analyzed serum levels of some cytokines, Fatty Acid Binding Protein 2 (FAPB-2), tryptophan, and some of its metabolites via serotonin and kynurenine.

ME/CFS patients were heterogeneous for genetic background, trigger, start mode, symptoms, and evolution. ME/CFS patients had higher levels of IL-17A (p = 0.018), FABP-2 (p = 0.002), and 3-hydroxykynurenine (p = 0.037) and lower levels of kynurenine (p = 0.012) and serotonin (p = 0.045) than controls. Changes in kynurenine and 3-hydroxykynurenine were associated with increased kynurenic acid/kynurenine and 3-hydroxykynurenine/kynurenine ratios, indirect measures of kynurenine aminotransferases and kynurenine 3-monooxygenase enzymatic activities, respectively.

No correlation was found among cytokines, FABP-2, and tryptophan metabolites, suggesting that inflammation, anomalies of the intestinal barrier, and changes of tryptophan metabolism may be independently associated with the pathogenesis of the disease.

Interestingly, patients with the start of the disease after infection showed lower levels of kynurenine (p = 0.034) than those not starting after an infection. Changes in tryptophan metabolites and increased IL-17A levels in ME/CFS could both be compatible with anomalies in the sphere of energy metabolism.

Overall, clinical traits together with serum biomarkers related to inflammation, intestine function, and tryptophan metabolism deserve to be further considered for the development of personalized medicine strategies for ME/CFS.

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Research: Limbic perfusion is reduced in patients with ME/CFS

Limbic perfusion is reduced in patients with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS), by Xia Li, Per Julin and Tie-Qiang Li in Tomography 2021, 7(4), 675-687; [doi.org/10.3390/tomography7040056] 1 Nov 2021

 

Research abstract:

Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is an illness characterized by a diverse range of debilitating symptoms including autonomic, immunologic, and cognitive dysfunction. Although neurological and cognitive aberrations have been consistently reported, relatively little is known regarding the regional cerebral blood flow (rCBF) in ME/CFS.

In this study, we studied a cohort of 31 ME/CSF patients (average age: 42.8 ± 13.5 years) and 48 healthy controls (average age: 42.9 ± 12.0 years) using the pseudo-continuous arterial spin labeling (PCASL) technique on a whole-body clinical 3T MRI scanner.

Besides routine clinical MRI, the protocol included a session of over 8 min-long rCBF measurement. The differences in the rCBF between the ME/CSF patients and healthy controls were statistically assessed with voxel-wise and AAL ROI-based two-sample t-tests. Linear regression analysis was also performed on the rCBF data by using the symptom severity score as the main regressor.

Hypoperfusion is a term that describes “a reduced amount of blood flow”

In comparison with the healthy controls, the patient group showed significant hypoperfusion (uncorrected voxel wise p ≤ 0.001, FWE p ≤ 0.01) in several brain regions of the limbic system, including the anterior cingulate cortex, putamen, pallidum, and anterior ventral insular area. For the ME/CFS patients, the overall symptom severity score at rest was significantly associated with a reduced rCBF in the anterior cingulate cortex.

In the human brain, the anterior cingulate cortex (ACC) is involved in certain higher-level functions, such as attention allocation, reward anticipation, decision-making, ethics and morality, impulse control (e.g. performance monitoring and error detection), and emotion. [Wikipedia]

The results of this study show that brain blood flow abnormalities in the limbic system may contribute to ME/CFS pathogenesis.

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Research: Analysis of post COVID-19 & its overlap with ME/CFS

Long COVID overlap with ME/CFS

 

A group of researchers from around the world have joined together to analyse long COVID’s symptom overlap with ME/CFS.

Highlights

  • Serious side effects and post-infection sequelae have been reported in SARS-CoV-2-infected patients after acute disease phase.
  • Long-COVID patient characteristics and symptoms were compared to myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS).
  • The onset, progression, and symptom profile of long-COVID patients have considerable overlap with ME/CFS.
  • Longitudinal monitoring of COVID-19 patients is warranted to understand the virus long-term effects.

 

 

 

 

 

 

 

Analysis of post COVID-19 condition and its overlap with myalgic encephalomyelitis/

chronic fatigue syndrome, by Olga A Sukocheva, Rebekah Maksoud, Narasimha M Beeraka, SabbaRao V Madhunapantula, Mikhail Sinelnikov, Vladimir N Nikolenko, Margarita E Neganova, Sergey G Klochkov, Mohammad Amjad Kamali, Donald R Staines, Sonya Marshall-Gradisnik in  Journal of Advanced Research, Volume 40, September 2022, Pages 179-196 [doi.org/10.1016/j.jare.2021.11.013] Preprint Nov 2021

Research abstract

Background

The severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) disease (COVID-19) triggers the development of numerous pathologies and infection-linked complications and exacerbates existing pathologies in nearly all body systems. Aside from the primarily targeted respiratory organs, adverse SARS-CoV-2 effects were observed in nervous, cardiovascular, gastrointestinal/metabolic, immune, and other systems in COVID-19 survivors. Long-term effects of this viral infection have been recently observed and represent distressing sequelae recognised by the World Health Organisation (WHO) as a distinct clinical entity defined as post-COVID-19 condition. Considering the pandemic is still ongoing, more time is required to confirm post COVID-19 condition diagnosis in the COVID-19 infected cohorts, although many reported post COVID-19 symptoms overlap with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS).

Aims of Review

In this study, COVID-19 clinical presentation and associated post-infection sequelae (post-COVID-19 condition) were reviewed and compared with ME/CFS symptomatology.

Key Scientific Concepts of Review

The onset, progression, and symptom profile of post COVID-19 condition patients have considerable overlap with ME/CFS. Considering the large scope and range of pro-inflammatory effects of this virus, it is reasonable to expect development of post COVID-19 clinical complications in a proportion of the affected population. There are reports of a later debilitating syndrome onset three months post COVID-19 infection (often described as long-COVID-19), marked by the presence of fatigue, headache, cognitive dysfunction, post-exertional malaise, orthostatic intolerance, and dyspnoea. Acute inflammation, oxidative stress, and increased levels of interleukin-6 (IL-6) and tumor necrosis factor alpha (TNFalpha), have been reported in SARS-CoV-2 infected patients.

Longitudinal monitoring of post COVID-19 patients is warranted to understand the long-term effects of SARS-CoV-2 infection and the pathomechanism of post COVID-19 condition.

 

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Hypothesis: An attempt to explain the neurological symptoms of ME/CFS

An attempt to explain the neurological symptoms of Myalgic Encephalomyelitis/ Chronic Fatigue Syndrome, by Klaus J Wirth, Carmen Scheibenbogen & Friedemann Paul in Journal of Translational Medicine volume 19, no: 471 (2021)

 

Review abstract

There is accumulating evidence of endothelial dysfunction, muscle and cerebral hypoperfusion in Myalgic Encephalomyelitis/ Chronic Fatigue Syndrome (ME/CFS).

In this paper we deduce the pathomechanisms resulting in central nervous pathology and the myriad of neurocognitive symptoms. We outline tentative mechanisms of impaired cerebral blood flow, increase in intracranial pressure and central adrenergic hyperactivity and how they can well explain the key symptoms of cognitive impairment, brain fog, headache, hypersensitivity, sleep disturbances and dysautonomia.

Excerpt from Introduction

Key neurological pathomechanisms in ME/CFS

ME/CFS is classified as a neurological disease. This is based on neurological symptoms including mental fatigue, impaired cognition, psychomotor slowing, disturbed sleep, hypersensitivities to noise, light and smells, headache, pain and paresthesias and severe dysautonomia.

Many symptoms are, however, not obviously explained by neurological pathology including the cardiovascular situation with orthostatic intolerance, hypovolemia and a low activity of the renin–angiotensin–aldosterone system (RAAS), or the impaired muscle function (reduced handgrip strength and fatigability) and energetic disturbance. This co-occurrence of seemingly unrelated symptoms and findings prompts to look for a unifying explanation (the most parsimonious explanation).

 The authors discuss:

  • Decreased cerebral blood flow (CBF)
  • Disturbed local blood flow regulation and neurovascular coupling
  • Increase in intracranial pressure
  • Disturbances of reflexes and autonomic function, hypervigilance and hypersensitivity to sensory stimuli such as light, noises and smells and brain fog
  • Hypocapnia, hyperventilation, respiratory alkalosis and possible consequences for skeletal muscle metabolism
  • Sleep disturbances and non-restorative sleep

Conclusion

Neurological symptoms in ME/CFS can be severe and debilitiating, but no clear specific brain pathology or lesions have been detected so far. Whether neuroinflammation or a brain stem pathology exists—where dysautonomia may have its origin as the primary disturbance eliciting ME/CFS—remains to be shown.

Decreased CBF, disturbed local blood flow regulation and neurovascular coupling, central adrenergic hyperactivity, hypocapnia and increase in intracranial presssure seem to play a strong role in the pathophysiology of the neurological symptoms in ME/CFS (Fig. 1). They can well explain cognitive impairment, brain fog, headache, psychomotor slowing, ataxia and loss of coordination of movements, hypersensitivity, sleep disturbances and dysautonomia.

Read full paper

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Research: Understanding the molecular changes of PEM in ME/CFS

Understanding the molecular changes of Post Exertional Malaise in ME/CFS,  by Jemma Elley (Thesis, Bachelor of Biomedical Sciences with Honours). University of Otago, 2021

 

Research abstract:

Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) is a debilitating and often life-long condition affecting over 20,000 New Zealanders. Symptoms include muscle and joint pain, severe fatigue, unrefreshing sleep, hypersensitivity to light and sound, and cognitive dysfunction. However, the condition lacks a reliable diagnostic biomarker, impairing patient diagnosis and treatment development. Previous research has identified several key physiological areas of promise from which markers might come, including mitochondrial dysfunction, HPA-axis impairment, immune alterations, increased oxidative stress and epigenome modifications.

This project focuses on post-exertional malaise (PEM), a cardinal symptom of ME/CFS. Post-exertional malaise is defined as an exacerbation of ME/CFS symptoms after physical, mental or emotional exertion. As PEM distinguishes ME/CFS from other fatigue-related conditions, it may aid in identifying the molecular basis of ME/CFS.

To determine the molecular changes leading to this malaise, five ME/CFS-affected individuals and two healthy controls performed an exercise paradigm where they were made to cycle on an ergometer until their peak work rate was reached. 20 mL of blood was taken from each individual before performing the exercise, and after two exercise episodes that were 24 hours apart.

Peripheral blood mononuclear cells (PBMCs) were purified from the blood by centrifuging on Ficol gradients. The mitochondrial function was determined on live cells using the Seahorse XF Cell Mito Stress Test Kit. The genomic DNA was extracted from the PBMCs and 8-hydroxy 2 deoxyguanosine (a marker of oxidative stress) was determined using an 8-hydroxy 2 deoxyguanosine ELISA Kit. Methylome changes were detected in the DNA by digestion of the DNA and preparation of 40-220bp fragment libraries before performing Reduced Representation Bisulfite sequencing.

A decrease in the mitochondrial function after the first exercise was observed in all ME/CFS individuals and one control. Contrary to existing literature, the ME/CFS group had, on average, a lower level of 8-hydroxy 2 deoxyguanosine compared to healthy controls.

An average of 1.25% of DNA fragments were differentially methylated between the baseline 24-hour and baseline and 48-hour samples. Results of a STRING protein network analysis on the differentially methylated fragments present in the promoter show interaction between upregulated mitochondrial, nervous system, immune function, and HPA-axis -associated genes. Additionally, hypermethylation and potentially decreased expression of POU3F4, a transcription factor with high expression levels in the basal ganglia (which regulates motor activity and motivation) provides evidence of how the PEM symptoms of increased fatigue and perceived exertion may arise.

Whilst the molecular changes during PEM are varied and complex, these results contribute to the knowledge of the processes underlying the symptoms, and by proxy, the overall pathophysiology of ME/CFS.

Supervisor: Prof Warren Tate

4.6. Conclusions

In summary, changes were observed in the oxygen consumption rate of ME/CFS subjects, as well as evidence of a difference between ME/CFS patients and healthy controls. The similarity in OCR profiles between ME/CFS-affected individuals and an over-exerted control should be further explored, as it potentially links the “increased perceived exertion” hypothesis with a physiological output.

The statistically significant decrease of ATP production after exercise should also be explored, potentially explaining the fatigue ME/CFS sufferers experience.
8-OHdG levels, as a measure of oxidative stress, did not appear to have drastic changes during the exercise paradigm, nor between ME/CFS individuals and controls. However, the spread of 8-OHdG levels in ME/CFS and healthy individuals should be assessed, as we cannot conclude that this minor difference is not, in fact, significant enough to act as a biomarker for ME/CFS.

Finally, significant differences in the DNA methylation of one individual’s genome was observed throughout the exercise paradigm, especially in genes related to the HPA-axis and immune system, metabolism, and circadian rhythm.

These findings buttress those reported by many other research groups. Whilst many researchers have investigated ME/CFS by comparing it to controls, the investigation of its key symptom, PEM, is underdeveloped. Therefore, this thesis contributes to filling a major gap in the field.

Additionally, this study employs a “precision medicine” approach, using patients as their own controls. Because of the fatigue-induced limitations of those with ME/CFS in partaking in studies, genome-wide investigations employing thousands of participants are not possible. This project provides an alternative, which, with increased sharing of data and machine learning, may provide a better way to approach ME/CFS research and the study of chronic illnesses in general.

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Research review: Immunoglobulin therapy for ME/CFS

Back to the Future? Immunoglobulin therapy for Myalgic Encephalomyelitis/Chronic Fatigue Syndrome, by  Helen Brownlie and Nigel Speight in Healthcare 2021, 9(11), 1546; [doi.org/10.3390/healthcare9111546]   12 Nov 2021 (This article belongs to the Special Issue ME/CFS – the Severely and Very Severely Affected)

 

Review abstract:

The findings of controlled trials on use of intravenous immunoglobulin G (IV IgG) to treat myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) are generally viewed as representing mixed results. On detailed review, a clearer picture emerges, which suggests that the potential therapeutic value of this intervention has been underestimated.

Our analysis is consistent with the propositions that:

  1. IgG is highly effective for a proportion of patients with severe and well-characterised ME/CFS;
  2. responders can be predicted with a high degree of accuracy based on markers of immune dysfunction.

Rigorous steps were taken in the research trials to record adverse events, with transient symptom exacerbation commonly experienced in both intervention and placebo control groups, suggesting that this reflected the impact of participation on people with an illness characterised by post-exertional symptom exacerbation. Worsening of certain specific symptoms, notably headache, did occur more commonly with IgG and may have been concomitant to effective treatment, being associated with clinical improvement.

The findings emerging from this review are supported by clinical observations relating to treatment of patients with severe and very severe ME/CFS, for whom intramuscular and subcutaneous administration provide alternative options.

We conclude that:

  1. there is a strong case for this area of research to be revived;
  2. pending further research, clinicians would be justified in offering a course of IgG to selected ME/CFS patients at the more severe end of the spectrum.

As the majority of trial participants had experienced an acute viral or viral-like onset, we further suggest that IgG treatment may be pertinent to the care of some patients who remain ill following infection with SARS-CoV-2 virus.

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Research: The characterization of IL-2 stimulation & treatment of TRPM3… in ME/CFS

Characterization of IL-2 stimulation and TRPM7 pharmacomodulation in NK Cell cytotoxicity and channel Co-Localization with PIP2 in Myalgic Encephalomyelitis/ Chronic Fatigue Syndrome patients, by Stanley Du Preez , Natalie Eaton-Fitch, Helene Cabanas, Donald Staines and Sonya Marshall-Gradisnik in Int. J. Environ. Res. Public Health 2021, 18(22), 11879; [doi.org/10.3390/ijerph182211879] 12 Nov 2021  (This article belongs to the Special Issue Chronic Fatigue Syndrome: Medical, Nursing and Public Health Management)

 

Research abstract:

Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a complex multisystemic disorder responsible for significant disability. Although a unifying etiology for ME/CFS is uncertain, impaired natural killer (NK) cell cytotoxicity represents a consistent and measurable feature of this disorder.

Research utilizing patient-derived NK cells has implicated dysregulated calcium (Ca2+) signaling, dysfunction of the phosphatidylinositol-4,5-bisphosphate (PIP2)-dependent cation channel, transient receptor potential melastatin (TRPM) 3, as well as altered surface expression patterns of TRPM3 and TRPM2 in the pathophysiology of ME/CFS.

TRPM7 is a related channel that is modulated by PIP2 and participates in Ca2+ signaling. Though TRPM7 is expressed on NK cells, the role of TRPM7 with IL-2 and intracellular signaling mechanisms in the NK cells of ME/CFS patients is unknown.

This study examined the effect of IL-2 stimulation and TRPM7 pharmacomodulation on NK cell cytotoxicity using flow cytometric assays as well as co-localization of TRPM7 with PIP2 and cortical actin using confocal microscopy in 17 ME/CFS patients and 17 age- and sex-matched healthy controls.

The outcomes of this investigation are preliminary and indicate that crosstalk between IL-2 and TRMP7 exists. A larger sample size to confirm these findings and characterization of TRPM7 in ME/CFS using other experimental modalities are warranted.

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