Susceptibility to immunologically mediated fatigue in C57BL/6 versus Balb/c mice

Abstract:

Proinflammatory cytokines such as interleukin (IL)-1 and tumor necrosis factor (TNF)-alpha have been proposed to play a role in the pathogenesis of fatigue. In the present study we compared the susceptibility of two mouse strains to immunologically induced fatigue.

Daily running of two strains of mice, Balb/c and C57BL/ 6, was assessed after a single injection of Corynebacterium parvum antigen (2 mg/mouse). Spontaneous running activity of each animal was compared to mean running distance prior to injection. To evaluate the involvement of cytokines in fatigue development, C57BL/6 mice were treated with antibodies to specific cytokines at the time of challenge with C. parvum antigen. Also, cytokine mRNA expression was analyzed in the brains of mice at different time periods after immunologic challenge.

A significant difference in running activity between the two mice strains was observed after C. parvum antigen inoculation: C57BL/6 mice showing a greater (P < 0.05) reduction in running activity (relative to preinjection levels) and slower recovery to baseline than Balb/c mice. Injection of antibodies specific to either IL-1beta or TNF-alpha did not alter immunologically induced fatigue, suggesting a lack of involvement of these cytokines produced outside of the central nervous system (CNS).

However, increased TNF-alpha and IL-1beta mRNA expression was found in the brains of C57BL/6 compared to that seen in Balb/c mice at 6, 10, and 15 days after C. parvum antigen injection. The elevated CNS cytokine mRNA expression corresponded to development of fatigue. These findings are consistent with the hypothesis that expression of proinflammatory cytokines within the CNS plays a role in the pathogenesis of immunologically mediated fatigue.

 

Source: Sheng WS, Hu S, Lamkin A, Peterson PK, Chao CC. Susceptibility to immunologically mediated fatigue in C57BL/6 versus Balb/c mice. Clin Immunol Immunopathol. 1996 Nov;81(2):161-7. http://www.ncbi.nlm.nih.gov/pubmed/8906747

 

Autoantibodies to nuclear envelope antigens in chronic fatigue syndrome

Abstract:

We have identified and partially characterized the autoantibodies in sera of 60 patients with chronic fatigue syndrome. Approximately 52% of the sera were found to react with nuclear envelope antigens.

The combination of nuclear rim staining observed in immunofluorescence microscopy and immunoblot analysis of highly purified nuclear envelope proteins provided initial characterization of these autoantibodies. Further characterization showed that some sera immunoprecipitated the in vitro transcription and translation product of a human cDNA clone encoding the nuclear envelope protein lamin B1. The autoantibodies were of the IgG isotype.

The occurrence of autoantibodies to a conserved intracellular protein like lamin B1 provides new laboratory evidence for an autoimmune component in chronic fatigue syndrome.

 

Source: Konstantinov K, von Mikecz A, Buchwald D, Jones J, Gerace L, Tan EM. Autoantibodies to nuclear envelope antigens in chronic fatigue syndrome. J Clin Invest. 1996 Oct 15;98(8):1888-96. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC507629/ (Full article)

 

Neuroimmune mechanisms in health and disease: 2. Disease

Abstract:

In the second part of their article on the emerging field of neuroimmunology, the authors present an overview of the role of neuroimmune mechanisms in defence against infectious diseases and in immune disorders. During acute febrile illness, immune-derived cytokines initiate an acute phase response, which is characterized by fever, inactivity, fatigue, anorexia and catabolism.

Profound neuroendocrine and metabolic changes take place: acute phase proteins are produced in the liver, bone marrow function and the metabolic activity of leukocytes are greatly increased, and specific immune reactivity is suppressed.

Defects in regulatory processes, which are fundamental to immune disorders and inflammatory diseases, may lie in the immune system, the neuro endocrine system or both. Defects in the hypothalamus-pituitary-adrenal axis have been observed in autoimmune and rheumatic diseases, chronic inflammatory disease, chronic fatigue syndrome and fibromyalgia.

Prolactin levels are often elevated in patients with systemic lupus erythematosus and other autoimmune diseases, whereas the bioactivity of prolactin is decreased in patients with rheumatoid arthritis. Levels of sex hormones and thyroid hormone are decreased during severe inflammatory disease. Defective neural regulation of inflammation likely plays a pathogenic role in allergy and asthma, in the symmetrical form of rheumatoid arthritis and in gastrointestinal inflammatory disease.

A better understanding of neuroimmunoregulation holds the promise of new approaches to the treatment of immune and inflammatory diseases with the use of hormones, neurotransmitters, neuropeptides and drugs that modulate these newly recognized immune regulators.

 

Source: Anisman H, Baines MG, Berczi I, Bernstein CN, Blennerhassett MG, Gorczynski RM, Greenberg AH, Kisil FT, Mathison RD, Nagy E, Nance DM, Perdue MH, Pomerantz DK, Sabbadini ER, Stanisz A, Warrington RJ. Neuroimmune mechanisms in health and disease: 2. Disease. CMAJ. 1996 Oct 15;155(8):1075-82. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1335357/ (Full article)

 

 

 

 

 

 

The history and treatment of chronic fatigue syndrome

Abstract:

This article looks at chronic fatigue syndrome, a common condition affecting 1-2.5% of the population. The criteria for diagnosis are described and the nurse’s role in treatment is discussed.

 

Source: Ross E. The history and treatment of chronic fatigue syndrome.  Nurs Times. 1996 Oct 30-Nov 5;92(44):34-6. http://www.ncbi.nlm.nih.gov/pubmed/8945330

 

Government’s expert group has reached consensus on prognosis of chronic fatigue syndrome

EDITOR,-The chronic fatigue syndrome is a complex problem that has attracted a great deal of controversy. Against this background, doctors working for the Department of Social Security and its executive agencies have to give informed and consistent advice. To help in this process I set up an expert group to give me advice on the subject. A consensus view was sought on prognosis and chronicity, which are critical factors in determining a person’s entitlement to a benefit or pension.

The expert group was drawn from a range of medical disciplines with an interest in the condition, so that it reflected a range of opinions; it first met on 6 March this year. A consensus emerged on most of the topics discussed. A report of the meeting has been published and circulated to to those who have a direct interest in the findings.

You can read the full article here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2359054/pdf/bmj00562-0061b.pdf

 

Source: Aylward M. Government’s expert group has reached consensus on prognosis of chronic fatigue syndrome. BMJ. 1996 Oct 5;313(7061):885. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2359054/

 

Myths dispelled about chronic fatigue syndrome

Chronic fatigue syndrome, despite being commonly known as “yuppie flu,” is not restricted to any social class or occupational group, according to a report by the Royal Colleges of Physicians, Psychiatrists, and General Practitioners.

The report, written at the request of the chief medical officer, Kenneth Calman, aims to dispel some of the popular myths surrounding this controversial condition. It says that there is no convincing evidence that common viral infections cause the chronic fatigue syndrome, although 10% of those with Epstein-Barr virus develop the syndrome.

You can read the rest of this article here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2359076/pdf/bmj00562-0011.pdf

 

Source: Mulube M. Myths dispelled about chronic fatigue syndrome. BMJ. 1996 Oct 5;313(7061):839. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2359076/

 

Chronic fatigue syndrome

“Biopsychosocial approach” may be difficult in practice

This week a joint working group of the Royal Colleges of Physicians, Psychiatrists, and General Practitioners in Britain issued a report on chronic fatigue syndrome.’ The report constitutes, arguably, the finest contemporary position statement in the field, and physicians and patients are well advised to read it, but it is sure to engender disagreement on both sides of the Atlantic.

The term chronic fatigue syndrome is relatively new. It first appeared in the 1988 proposal by the United States Centers for Disease Control to formalise a working case definition for symptoms that had been variously named and attributed to numerous causes for over two centuries. Through field testing, the case definition was revised and simplified in 1994. In essence, it classifies a constellation of prolonged and debilitat ing symptoms as worthy of medical attention and study (see box). Related case criteria were developed by consensus at Oxford in 199 .4 Neither the American nor the Oxford criteria assume the syndrome to be a single nosological entity. As the royal colleges’ report concludes, the term chronic fatigue syndrome is appropriate because it carries none of the inaccurate aetiological implications of the alternative acronyms-myalgic encephalomyelitis, chronic fatigue syndrome, and immune dysfunction syndrome.

You can read the rest of this comment here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2359057/pdf/bmj00562-0007.pdf

 

Source: Straus SE. Chronic fatigue syndrome. BMJ. 1996 Oct 5;313(7061):831-2. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2359057/

 

Is perfectionism associated with fatigue?

Abstract:

Perfectionism has been implicated as a vulnerability factor in the development of chronic unexplained fatigue. In the present study, different components of fatigue and perfectionism were studied in 121 female nurses. They completed a postal questionnaire assessing current (state) and usual (trait) fatigue, and dimensions of personality including six components of perfectionism. Night-shift work was associated with state, but not trait, fatigue. Negative, but not positive, components of perfectionism were associated with mental trait fatigue in particular, but also with physical trait fatigue. In contrast, the associations with positive perfectionism tended to be inverse. Multiple regression modeling indicated that neuroticism as well as negative perfectionism were separately associated with trait fatigue. We suggest that negative aspects of perfectionism may cause maladaptive coping strategies which predispose individuals to fatigue.

 

Source: Magnusson AE, Nias DK, White PD. Is perfectionism associated with fatigue? J Psychosom Res. 1996 Oct;41(4):377-83. http://www.ncbi.nlm.nih.gov/pubmed/8971668

 

Cognitive functioning in patients with chronic fatigue syndrome

Abstract:

A comprehensive battery of neuropsychological tests was administered to 35 outpatients suffering from Chronic Fatigue Syndrome (CFS). They were compared to 33 normal controls matched for age, gender, intelligence, and education.

The patients displayed psychomotor slowing and impaired attention. The learning rate of verbal and visual material for patients with CFS was slower, and delayed recall of verbal and visual information was impaired. Because there was a high variability in cognitive impairment within the CFS group, it would be inappropriate to generalize results to the entire CFS population. Two neuropsychological variables indicating aspects of psychomotor performance and verbal memory were found to discriminate best between patients and controls.

 

Source: Michiels V, Cluydts R, Fischler B, Hoffmann G, Le Bon O, De Meirleir K. Cognitive functioning in patients with chronic fatigue syndrome. J Clin Exp Neuropsychol. 1996 Oct;18(5):666-77. http://www.ncbi.nlm.nih.gov/pubmed/8941852

 

Possible relationship between chronic fatigue and postural tachycardia syndromes

Abstract:

Postural tachycardia syndrome refers to the development of symptoms such as light-headedness, visual blurring, palpitations and weakness on assuming an upright posture; these symptoms are relieved by resuming a supine posture. This syndrome is occasionally associated with idiopathic hypovolemia, impaired vasomotor tone, deconditioning and autonomic neuropathy, but has not been reported in association with chronic fatigue syndrome (CFS).

We describe five patients who satisfied the CFS criteria of the Centres for Disease Control and Prevention. Upright tilt-table testing induced significant hypotension and increased heart rate in all five patients, consistent with clinical and autonomic manifestation of postural tachycardia syndrome.

 

Source: De Lorenzo F, Hargreaves J, Kakkar VV. Possible relationship between chronic fatigue and postural tachycardia syndromes. Clin Auton Res. 1996 Oct;6(5):263-4. http://www.ncbi.nlm.nih.gov/pubmed/8899252