Survey of Anti-Pathogen Antibody Levels in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome

Infectious pathogens are implicated in the etiology of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) because of the occurrence of outbreaks of the disease. While a number of different infectious agents have been associated with the onset of ME/CFS, the identity of a specific organism has been difficult to determine in individual cases. The aim of our study is to survey ME/CFS subjects for evidence of an infectious trigger and/or evidence of immune dysregulation via serological testing of plasma samples for antibodies to 122 different pathogen antigens.
Immune profiles were compared to age-, sex-, and BMI-matched controls to provide a basis for comparison. Antibody levels to individual antigens surveyed in this study do not implicate any one of the pathogens in ME/CFS, nor do they rule out common pathogens that frequently infect the US population. However, our results revealed sex-based differences in steady-state humoral immunity, both within the ME/CFS cohort and when compared to trends seen in the healthy control cohort.
Source: O’Neal AJ, Glass KA, Emig CJ, Vitug AA, Henry SJ, Shungu DC, Mao X, Levine SM, Hanson MR. Survey of Anti-Pathogen Antibody Levels in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome. Proteomes. 2022; 10(2):21. https://doi.org/10.3390/proteomes10020021 https://www.mdpi.com/2227-7382/10/2/21/htm (Full text)

Sexual dimorphism in a neuronal mechanism of spinal hyperexcitability across rodent and human models of pathological pain

Abstract:

The prevalence and severity of many chronic pain syndromes differ across sex, and recent studies have identified differences in immune signalling within spinal nociceptive circuits as a potential mediator. Although it has been proposed that sex-specific pain mechanisms converge once they reach neurons within the superficial dorsal horn, direct investigations using rodent and human preclinical pain models have been lacking.

Here, we discovered that in the Freund’s adjuvant in vivo model of inflammatory pain, where both male and female rats display tactile allodynia, a pathological coupling between KCC2-dependent disinhibition and N-methyl-D-aspartate receptor (NMDAR) potentiation within superficial dorsal horn neurons was observed in male but not female rats. Unlike males, the neuroimmune mediator brain-derived neurotrophic factor (BDNF) failed to downregulate inhibitory signalling elements (KCC2 and STEP61) and upregulate excitatory elements (pFyn, GluN2B and pGluN2B) in female rats, resulting in no effect of ex vivo brain-derived neurotrophic factor on synaptic NMDAR responses in female lamina I neurons. Importantly, this sex difference in spinal pain processing was conserved from rodents to humans.

As in rodents, ex vivo spinal treatment with BDNF downregulated markers of disinhibition and upregulated markers of facilitated excitation in superficial dorsal horn neurons from male but not female human organ donors. Ovariectomy in female rats recapitulated the male pathological pain neuronal phenotype, with BDNF driving a coupling between disinhibition and NMDAR potentiation in adult lamina I neurons following the prepubescent elimination of sex hormones in females. This discovery of sexual dimorphism in a central neuronal mechanism of chronic pain across species provides a foundational step towards a better understanding and treatment for pain in both sexes.

Source: Dedek A, Xu J, Lorenzo LÉ, Godin AG, Kandegedara CM, Glavina G, Landrigan JA, Lombroso PJ, De Koninck Y, Tsai EC, Hildebrand ME. Sexual dimorphism in a neuronal mechanism of spinal hyperexcitability across rodent and human models of pathological pain. Brain. 2022 Apr 29;145(3):1124-1138. doi: 10.1093/brain/awab408. PMID: 35323848; PMCID: PMC9050559. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9050559/ (Full text)

The underlying sex differences in neuroendocrine adaptations relevant to Myalgic Encephalomyelitis Chronic Fatigue Syndrome

Abstract:

Introduction: Myalgic Encephalomyelitis/ Chronic Fatigue Syndrome (ME/CFS) is a complex multisystem disease characterised by severe and disabling new-onset symptoms of post-exertional malaise (PEM), fatigue, brain fog, and sleep dysfunction that lasts for at least six months. Accumulating evidence suggests that sex and endocrine events have a significant influence on symptom onset and moderation of ME/CFS, with female sex being one of the most consistent and credible predictive risk factors associated with diagnosis. Such sex differences suggest sex chromosomes and sex steroids may play a part in the development of the condition or moderation of symptoms, although this has yet to be explored in detail.

Methods/aims: This narrative review outlines sex differences in ME/CFS in terms of vulnerability factors and clinical phenotype and explores the known sex differences in neuroendocrine systems affected in ME/CFS and how this may relate to disease risk, onset, pathophysiology, and potential treatment avenues.

Conclusions: There is clear evidence of a sex dimorphism with regards to prevalence (3:1 female preponderance), clinical phenotypes, and aetiological triggers prior to symptom onset of ME/CFS. Endocrinological events, particularly those throughout the female lifespan, are associated with ME/CFS and include reproductive menstrual cycle fluctuations, pregnancy, post-partum and perimenopause. Further, there is evidence for gonadal sex, adrenal stress and renal neuroendocrine systems as implicated in ME/CFS, including changes in estrogen, progesterone compounds, aldosterone, and cortisol levels, of which there are established sex differences. The broad effects of steroid hormones on the physiological systems may also speak to the diversity of ME/CFS symptomatology observed in patients. Further attention must be paid to sex, age, and steroid biology in ME/CFS.

Source: Thomas N, Gurvich C, Huang K, Gooley PR, Armstrong CW. The underlying sex differences in neuroendocrine adaptations relevant to Myalgic Encephalomyelitis Chronic Fatigue Syndrome. Front Neuroendocrinol. 2022 Apr 11:100995. doi: 10.1016/j.yfrne.2022.100995. Epub ahead of print. PMID: 35421511. https://www.sciencedirect.com/science/article/abs/pii/S0091302222000188?via%3Dihub  (Full text)

The Female-Predominant Persistent Immune Dysregulation of the Post-COVID Syndrome

Abstract:

Objective: To describe the clinical data from the first 108 patients seen in the Mayo Clinic post-COVID-19 care clinic (PCOCC).

Methods: After Institutional Review Board approval, we reviewed the charts of the first 108 patients seen between January 19, 2021, and April 29, 2021, in the PCOCC and abstracted from the electronic medical record into a standardized database to facilitate analysis. Patients were grouped into phenotypes by expert review.

Results: Most of the patients seen in our clinic were female (75%; 81/108), and the median age at presentation was 46 years (interquartile range, 37 to 55 years). All had post-acute sequelae of SARS-CoV-2 infection, with 6 clinical phenotypes being identified: fatigue predominant (n=69), dyspnea predominant (n=23), myalgia predominant (n=6), orthostasis predominant (n=6), chest pain predominant (n=3), and headache predominant (n=1). The fatigue-predominant phenotype was more common in women, and the dyspnea-predominant phenotype was more common in men. Interleukin 6 (IL-6) was elevated in 61% of patients (69% of women; P=.0046), which was more common than elevation in C-reactive protein and erythrocyte sedimentation rate, identified in 17% and 20% of cases, respectively.

Conclusion: In our PCOCC, we observed several distinct clinical phenotypes. Fatigue predominance was the most common presentation and was associated with elevated IL-6 levels and female sex. Dyspnea predominance was more common in men and was not associated with elevated IL-6 levels. IL-6 levels were more likely than erythrocyte sedimentation rate and C-reactive protein to be elevated in patients with post-acute sequelae of SARS-CoV-2 infection.

Source: Ganesh R, Grach SL, Ghosh AK, Bierle DM, Salonen BR, Collins NM, Joshi AY, Boeder ND Jr, Anstine CV, Mueller MR, Wight EC, Croghan IT, Badley AD, Carter RE, Hurt RT. The Female-Predominant Persistent Immune Dysregulation of the Post-COVID Syndrome. Mayo Clin Proc. 2022 Feb 5:S0025-6196(21)00888-0. doi: 10.1016/j.mayocp.2021.11.033. Epub ahead of print. PMID: 35135695; PMCID: PMC8817110. https://www.sciencedirect.com/science/article/pii/S0025619621008880 (Full text)

Male vs. Female Differences in Responding to Oxygen-Ozone Autohemotherapy (O 2-O 3-AHT) in Patients with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS)

Abstract:

Background: Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) is a syndrome that has fatigue as its major symptom. Evidence suggests that ozone is able to relieve ME/CFS-related fatigue in affected patients.

Objective: To evaluate whether differences exist between males and females in ozone therapy outputs in ME/CFS. (3) Methods: In total, 200 patients previously diagnosed with ME/CFS (mean age 33 ± 13 SD years) underwent treatment with oxygen-ozone autohemotherapy (O2-O3-AHT). Fatigue was investigated via an FSS 7-scoring questionnaire before and following 1 month after treatment.

Results: The Mann-Whitney test (MW test) assessed the significance of this difference (H = 13.8041, p = 0.0002), and female patients showed better outcomes than males. This difference was particularly striking in the youngest age cohort (14-29 years), and a KW test resulted in H = 7.1609, p = 0.007 for the Δ = 28.3% (males = 3.8, females = 5.3).

Conclusions: When treated with O2-O3-AHT, females respond better than males.

Source: Chirumbolo S, Valdenassi L, Franzini M, Pandolfi S, Ricevuti G, Tirelli U. Male vs. Female Differences in Responding to Oxygen-Ozone Autohemotherapy (O2-O3-AHT) in Patients with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS). J Clin Med. 2021 Dec 29;11(1):173. doi: 10.3390/jcm11010173. PMID: 35011914. https://pubmed.ncbi.nlm.nih.gov/35011914/

Sex-specific plasma lipid profiles of ME/CFS patients and their association with pain, fatigue, and cognitive symptoms

Abstract:

Background: Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a complex illness which disproportionally affects females. This illness is associated with immune and metabolic perturbations that may be influenced by lipid metabolism. We therefore hypothesized that plasma lipids from ME/CFS patients will provide a unique biomarker signature of disturbances in immune, inflammation and metabolic processes associated with ME/CFS.

Methods: Lipidomic analyses were performed on plasma from a cohort of 50 ME/CFS patients and 50 controls (50% males and similar age and ethnicity per group). Analyses were conducted with nano-flow liquid chromatography (nLC) and high-performance liquid chromatography (HPLC) systems coupled with a high mass accuracy ORBITRAP mass spectrometer, allowing detection of plasma lipid concentration ranges over three orders of magnitude. We examined plasma phospholipids (PL), neutral lipids (NL) and bioactive lipids in ME/CFS patients and controls and examined the influence of sex on the relationship between lipids and ME/CFS diagnosis.

Results: Among females, levels of total phosphatidylethanolamine (PE), omega-6 arachidonic acid-containing PE, and total hexosylceramides (HexCer) were significantly decreased in ME/CFS compared to controls. In males, levels of total HexCer, monounsaturated PE, phosphatidylinositol (PI), and saturated triglycerides (TG) were increased in ME/CFS patients compared to controls. Additionally, omega-6 linoleic acid-derived oxylipins were significantly increased in male ME/CFS patients versus male controls. Principal component analysis (PCA) identified three major components containing mostly PC and a few PE, PI and SM species-all of which were negatively associated with headache and fatigue severity, irrespective of sex. Correlations of oxylipins, ethanolamides and ME/CFS symptom severity showed that lower concentrations of these lipids corresponded with an increase in the severity of headaches, fatigue and cognitive difficulties and that this association was influenced by sex.

Conclusion: The observed sex-specific pattern of dysregulated PL, NL, HexCer and oxylipins in ME/CFS patients suggests a possible role of these lipids in promoting immune dysfunction and inflammation which may be among the underlying factors driving the clinical presentation of fatigue, chronic pain, and cognitive difficulties in ill patients. Further evaluation of lipid metabolism pathways is warranted to better understand ME/CFS pathogenesis.

Source: Nkiliza A, Parks M, Cseresznye A, Oberlin S, Evans JE, Darcey T, Aenlle K, Niedospial D, Mullan M, Crawford F, Klimas N, Abdullah L. Sex-specific plasma lipid profiles of ME/CFS patients and their association with pain, fatigue, and cognitive symptoms. J Transl Med. 2021 Aug 28;19(1):370. doi: 10.1186/s12967-021-03035-6. PMID: 34454515. https://pubmed.ncbi.nlm.nih.gov/34454515/

Chronic fatigue syndrome: The male disorder that became a female disorder

Previously long-term fatigue was considered a male disorder caused by societal pressures. Today women comprise the majority of ME patients, and they feel that their condition is their own fault.

Throughout history some people have suffered from a lack of energy and long-term, physical fatigue. Today these symptoms are classified as myalgic encephalomyelitis (ME) or chronic fatigue syndrome (CFS).

It is commonly thought that chronic fatigue has mainly psychological causes and that it affects perfectionistic women who cannot live up to their own unreasonably high standards.

This has not always been the case. Just over 100 years ago it was primarily upper class men in intellectual professions who were affected. “Neurasthenia,” as the condition was called at the time, was a physical diagnosis with high status.

No longer legitimate

“The medical understanding of long-term fatigue has changed. Previously the condition was viewed as a typically male disorder; now it is perceived as a typically female disorder. The diagnosis of neurasthenia, which has a male connotation, was changed to the ME diagnosis, which has a female connotation,” explains Olaug S. Lian, a sociologist and professor at UiT The Arctic University of Norway.

Together with Hilde Bondevik of the University of Oslo, Lian has studied how the view of women and perceptions of the body, gender and femininity in two different historical periods have been manifested in the medical understanding of long-term chronic fatigue.

“Long-term fatigue was viewed as a legitimate disorder, a result of the heroic efforts of the upper class male. Today, it is a stigmatizing disorder, understood as an expression of women’s lack of ability to cope with their lives, a kind of breach of character,” says Lian.

Not only has the fatigued patient changed gender. Previously doctors believed that long-term fatigue was a neurological, physical disorder, while today it is categorized primarily as psychological in nature. And while in the past, society was thought to be the cause of the disorder, today the individual is supposedly to blame.

What happened to cause this change?

Upper class diagnosis

At the end of the 1800s neurasthenia was the most widespread diagnosis for long-term fatigue. Neurologists believed the condition was caused by a physical, neurological disease that affected the entire body, causing intense, long-term fatigue.

Although women were also diagnosed with the disorder, the typical patient was a man, and not just any kind of man. He was “civilized, refined, and educated, rather than of the barbarous and low-born and untrained,” according to neurologist George Beard.

Society was to blame

Doctors at the time believed that the cause of the disorder could be found in a rapidly changing society — urbanization, industrialization and women’s entry into working life.

Quite simply, modern civilization ran roughshod over the nervous system of upper class men, who were overstimulated by too much pressure and activity and too little sleep and rest.

“It was regarded as both legitimate and understandable that even the ‘great men’ could fall apart as a result of long-term, difficult intellectual work. It was viewed as positive that the body sent signals when the burden was too great. The body was viewed as an electrical fuse box and the thinking was that it was better for one fuse to burn out rather than for the house to catch on fire,” says Lian.

Different genders, different causes

The comments about the diagnosis also revealed past understandings of biological gender differences. Women could get neurasthenia from sexual frustration, while men could get it from excessive sexual activity, including masturbation.

Moreover, there was a connection between gender and class.

“To simplify a bit, we can say that it was mainly middle class men and working class women whose diagnosis of neurasthenia was explained by overwork. For working class men it was due to sexual escapades, and for middle class women the cause given was heredity or ‘women’s issues’,” explains Lian.

The fall of neurasthenia

Neurasthenia lost its popularity as a diagnosis in the early 1900s. One reason for this was that psychiatry became a medical field in its own right.

“Psychiatry took neurasthenia with it and changed its definition from a physical to a psychological condition. Since women were regarded as psychologically weaker and therefore more disposed to mental illness, the disorder became a female problem,” says Lian.

Fight over definitions

Today ME is the most common name for the disorder, defined as long-term, intense fatigue that cannot be directly linked to a well-defined illness and that does not disappear with rest. The condition is chronic, it cannot be cured with medical treatment and there is disagreement as to the cause.

“The lack of scientifically generated findings, medical explanations and effective treatment make ME a diagnosis with low status and low legitimacy within the medical community,” says Lian.

Currently the main theory is that ME results from an inability to handle stress and that perfectionistic people — the “good girls” — are especially at risk. The debate about how ME should be understood and explained is highly polarized, between those who believe that it is an illness caused by infections or vaccination and those who believe that ME has mainly psychological causes.

“I would like to see some humility about what we actually know about the disorder and not present value judgments as facts. Doctors must also be honest and acknowledge that we have very little hard-and-fast knowledge about this condition,” states Lian.

Blame and shame

The two historical periods have almost identical depictions of the phenomenon of long-term fatigue, although the names are different. But there is one important difference: the disorder is no longer regarded as a legitimate, anticipated outcome of overwork.

“Today the medical community is searching for explanations of ME at the individual level. The ME patient is depicted as a woman with five-star goals and four-star abilities — with character traits that make it hard for them to cope with their own lives,” says Lian.

“When the entire problem is seen as the patient’s fault, the person experiences blame and shame because it is the patient, not society, who is the cause of the illness. It is therefore the individual who is responsible for coping with the illness, such as by changing her own thought patterns,” says Lian.

Wrong kind of tired

She points out that the ability to cope with one’s own life is an important value in Western culture. Mental disorders, however, are associated with weakness. The current understanding of long-term fatigue is also linked to how we think about tiredness, according to Lian.

“There are strong norms for when you are allowed to be tired and worn out and how you are supposed to show tiredness in daily life. If you have been awake all night with a sick infant, you have a good reason to be tired at work. Other reasons are less legitimate. Workplace reports of absence never state that someone is at the psychologist, while it is completely acceptable to say that someone is at the dentist.”

“Being tired for the wrong reasons is seen as a sign of weakness, which must be overcome and hidden. It is in this context that we must understand the medical theories on a lack of coping ability and the objections of ME patients to these theories,” says Lian.

She believes such norms often make ME patients feel that the psychological explanation is a burden, although doctors do not necessarily mean for it to have this affect.

“What is it about the ME debate that makes the opposing sides so obstinate?”

“The doctors and patients talk past each other. The doctors think that an ME diagnosis is value neutral, but the patient hears ‘it’s my fault that I am sick and it’s my responsible to get better’. But although most people feel that mental disorders have lower value than somatic disorders, it is not a given that the doctors do,” says Lian.

Gendered explanation disappeared?

Although about three of four people who are diagnosed with ME today are women, the explicit, biology-based gendered explanations have disappeared from the debate, according to Lian.

“This may simply be because today we put greater focus on gender equality — which makes it less legitimate to claim that women are naturally inferior to men,” says Lian.

However, she believes that the ME diagnosis embodies a view of women that has long historical roots.

“The profile of the upper class woman from the 1800s who cannot cope with pressure and stress both inside and outside the home is still with us today,” says Lian.

Cultural bias

“How can your analysis contribute to the current debate about ME?”

“We show how the medical understanding of fatigue and lack of energy is impacted by the norms and values of society at large, for example, that medical knowledge reflects the view of women in our culture. Norms and values combine with biomedical knowledge in a way that makes it difficult to see what is what,” says Lian.

 

Source: KILDEN – Information Centre for Gender Research in Norway. (2014, February 20). Chronic fatigue syndrome: The male disorder that became a female disorder. ScienceDaily. Retrieved March 4, 2017 from https://www.sciencedaily.com/releases/2014/02/140220083145.htm

 

Support for the microgenderome invites enquiry into sex differences

Abstract:

The microgenderome defines the interaction between microbiota, sex hormones and the immune system. Our recent research inferred support for the microgenderome by showing sex differences in microbiota-symptom associations in a clinical sample of patients with myalgic encephalomyelitis / chronic fatigue syndrome (ME/CFS).

This addendum expands upon the sex-specific pattern of associations that were observed. Interpretations are hypothesized in relation to genera versus species-level analyses and D-lactate theory. Evidence of sex-differences invites future research to consider sex comparisons in microbial function even when microbial abundance is statistically similar. Pairing assessment of clinical symptoms with microbial culture, DNA sequencing and metabolomics methods will help advance our current understandings of the role of the microbiome in health and disease.

 

Source: Wallis A, Butt H, Ball M, Lewis DP, Bruck D. Support for the microgenderome invites enquiry into sex differences. Gut Microbes. 2017 Jan 2;8(1):46-52. doi: 10.1080/19490976.2016.1256524. Epub 2016 Nov 3. https://www.ncbi.nlm.nih.gov/pubmed/27808584

 

Chronic Fatigue Syndrome at Age 16 Years

Abstract:

BACKGROUND: In the Avon Longitudinal Study of Parents and Children (ALSPAC) birth cohort, chronic disabling fatigue lasting ≥6 months affected 1.3% of 13-year-olds, was equally common in boys and girls, and became more prevalent with increasing family adversity.

METHODS: ALSPAC data were used to estimate the prevalence of chronic fatigue syndrome (CFS) at age 16 years, defined by parental report of unexplained disabling fatigue lasting ≥6 months. We investigated gender and a composite 14-item family adversity index as risk factors. School absence data were obtained from the National Pupil Database. Multiple imputation was used to address bias caused by missing data.

RESULTS: The prevalence of CFS was 1.86% (95% confidence interval [CI]: 1.47 to 2.24). After excluding children with high levels of depressive symptoms, the prevalence was 0.60% (95% CI: 0.37 to 0.84). Authorized school absences were much higher (mean difference: 35.6 [95% CI: 26.4 to 44.9] half-day sessions per academic year) and reported depressive symptoms were much more likely (odds ratio [OR]: 11.0 [95% CI: 5.92 to 20.4]) in children with CFS than in those without CFS. Female gender (OR: 1.95 [95% CI: 1.33 to 2.86]) and family adversity (OR: 1.20 [95% CI: 1.01 to 1.42] per unit family adversity index) were also associated with CFS.

CONCLUSIONS: CFS affected 1.9% of 16-year-olds in a UK birth cohort and was positively associated with higher family adversity. Gender was a risk factor at age 16 years but not at age 13 years or in 16-year-olds without high levels of depressive symptoms.

Copyright © 2016 by the American Academy of Pediatrics.

 

Source: Collin SM, Norris T, Nuevo R, Tilling K, Joinson C, Sterne JA, Crawley E. Chronic Fatigue Syndrome at Age 16 Years. Pediatrics. 2016 Feb;137(2):e20153434. doi: 10.1542/peds.2015-3434. Epub 2016 Jan 25. http://pediatrics.aappublications.org/content/137/2/e20153434.long (Full article)

 

Support for the Microgenderome: Associations in a Human Clinical Population

Abstract:

The ‘microgenderome’ provides a paradigm shift that highlights the role of sex differences in the host-microbiota interaction relevant for autoimmune and neuro-immune conditions. Analysis of cross-sectional self-report and faecal microbial data from 274 patients with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) suggests that commensal gut microorganisms may play both protective and deleterious roles in symptom expression.

Results revealed significant sex-specific interactions between Firmicutes (Clostridium, Streptococcus, Lactobacillus and Enterococcus) and ME/CFS symptoms (including neurological, immune and mood symptoms), regardless of compositional similarity in microbial levels across the sexes. Extending animal studies, we provide support for the microgenderome in a human clinical population. Applied and mechanistic research needs to consider sex-interactions when examining the composition and function of human microbiota.

 

Source: Wallis A, Butt H, Ball M, Lewis DP, Bruck D. Support for the Microgenderome: Associations in a Human Clinical Population. Sci Rep. 2016 Jan 13;6:19171. doi: 10.1038/srep19171. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4725945/ (Full article)