Judul Artikel : IBS AND FOOD ALLERGY
Link Artikel : IBS AND FOOD ALLERGY
IBS AND FOOD ALLERGY
Artikel FOOD ALLERGY IBS,Tag : FOOD ALLERGY IBS, Food allergy and irritable bowel syndrome
Dr Widodo Judarwanto MD, Children Allergy Center Jakarta Indonesia
Irritable bowel syndrome (IBS) is a common disorder which causes abdominal pain, abdominal distension, and bowel dysfunction, characterised by loose bowels, constipation, or a fluctuation between these two extremes.1 This condition significantly impairs quality of life and places a large burden on health care resources. Treatment of IBS is largely based on the use of antispasmodics, antidepressants, and medications that modify bowel habit, depending on whether constipation or diarrhoea is the predominant problem. The notorious inadequacies of current drug therapy lead to much patient dissatisfaction and a tendency for patients to seek a variety of alternative remedies, especially of a dietary nature.
The notion of food allergy in irritable bowel syndrome (IBS) is not new. However, recent evidence suggests significant reduction in IBS symptom severity in patients on elimination diets, provided that dietary elimination is based on foods against which the individual had raised IgG antibodies. These findings should encourage studies dissecting the mechanisms responsible for IgG production against dietary antigens and their putative role in IBS
Bringing empirical observations ad fontes advances science. In astrophysics, the term "black hole" was introduced to describe an extremely dense star which had collapsed into a singularity under its own gravity. A black hole radiates nothing; it absorbs all matter and energy falling within its sphere. The name was coined only after revisiting the initial theoretical achievements of Karl Schwarzschild, when observations made outside the earth’s atmosphere gave astrophysicists empirical x ray data on a new type of cosmic object. In allergology, in contrast, adherence to a paradigm whereby allergy is defined by the presence of specific IgE antibodies has hampered disentanglement. As a result, allergy remains a dubiously defined term with no unambiguous empirical content or explanatory power. The time has come to seize upon the available empirical data and plunge into the original theory of Clemens von Pirquet.
The term allergy was introduced by von Pirquet to denote a changed immunological reactivity which manifests itself on second exposure to an antigen. This altered reactivity is uncommitted, giving no indication of the direction of change; equally harmful and protective immune reactivity reflects prior encounte. In modern terms, altered reactivity can be seen to evince either the most common mode of immune response elicited by the intestinal immune system, tolerance, recently defined as any mechanism by which a potentially injurious immune response is prevented, suppressed, or shifted to a non-injurious class of immune response, or abrogation of such an actively maintained process, which is currently linked to immunoinflammatory disease. Reassessment of the original theory of allergy is important as it would appear that it is not the immunological resources gained during antigen exposure, measurable by specific antibodies or specifically responding lymphocytes, which are decisive for the presence or absence of disease, but the complex cascade of events determining their use.
The notion of food allergy in irritable bowel syndrome (IBS) resurfaces in scientific thinking in this issue of Gut3 on the basis of a solid randomised placebo controlled trial conducted by Atkinson and colleagues . Determination of serum IgG antibodies against foods was used to guide the construction of elimination diets.
Most patients with IBS have attempted at least some form of dietary modification, which in some cases can be very extreme. Conflicting results have been reported using exclusion diets and this approach also suffers from the limitation that it has to be empirical. Thus potentially offending foods can only be identified after their elimination and subsequent reintroduction. This time consuming process would be much reduced if the offending foods could be identified beforehand. The observation that adherence to the diet is critical in determining a good outcome in the "true" diet group but not the "sham" group is indicative of the fact that the diet is an "active treatment" which if not adhered to, does not seem to have an effect.
There is currently considerable interest in the concept that at least in some patients, IBS may have an inflammatory component. Most of the work in this area has centred on post dysenteric IBS, with gut pathogens being viewed as the initiators of this process which can be identified by subtle changes on histology. However, if, as indicated in this study, IgG antibodies to food are important in the pathogenesis of IBS in some patients, they too may be of relevance. Not all patients exhibiting histological features consistent with post dysenteric IBS give a history of a previous dysenteric illness. This is usually assumed to be due to the fact that this has been forgotten by the patient but our results may suggest an alternative mechanism for immune activation and inflammation without the need for prior infection.
It is now well recognised that up to 70% of patients with IBS have evidence of hypersensitivity of the rectum, which probably extends to involve most of the gut in many individuals. It is possible that this hypersensitivity renders patients more reactive to a low grade inflammatory process which would not necessarily cause symptoms in a normal individual.
The presence of specific IgG class antibodies is often accepted as uncommitted or protective "altered reactivity", unlike those of the IgE class. Detection of antigen specific IgE is invariably taken as an attribute of causality, a condition called "IgE mediated disease" and, more specifically, of "allergy".1 However, empirical data are accumulating to suggest that transient increases in antigen specific IgE antibodies prevail in most healthy asymptomatic children during the first five years of life. Secondly, generation of these antibodies (sensitisation) on antigen exposure may not necessarily induce clinical disease (atopic disease).5 Thirdly, reducing the risk of atopic disease does not necessitate reduction of sensitization and, finally, resolution or aggravation of clinical disease is not invariably associated with a corresponding alteration in antibody concentration. Bearing these limitations in mind, however, the clinician may successfully profit from determination of specific IgE to complete the clinical history in an attempt to identify potential offending antigens in a symptomatic patient’s diet for the explicit diagnostic elimination-challenge procedure. This is precisely what Atkinson et al did, with specific IgG antibodies. They identified a significant reduction in IBS symptom severity in patients on elimination diets, provided that dietary elimination was based on foods against which the individual had raised IgG antibodies; fully compliant patients showed the best clinical improvement. The reverse pattern was observed after reintroduction of the respective foods.
"IBS appears to result from an interplay between susceptibility genes and impaired gut barrier functions, immunological dysregulation, together with bacterial and viral infections and other environmental factors"
In common with allergic disease, IBS appears to result from an interplay between susceptibility genes and impaired gut barrier functions, immunological dysregulation, together with bacterial and viral infections and other environmental factors. It is no easy matter to describe succinctly "gut barrier function". In the gastrointestinal tract, the external and internal environments are in close proximity. The dilemma of the mucosal surface of the intestine is to fend off the constant challenge from antigens, such as microorganisms, in mounting a brisk response to pathogens, and to enable assimilation of innocuous antigens derived from food. In order to perform these opposing functions, the intestine is in a state of continuous immune responsiveness, and a delicate balance is generated and maintained between concomitant facilitation and suppression of inflammatory responses.
Gut barrier function consists of physiological and immunological factors which exclude and degrade antigens and restrict their adherence, penetration, and transfer. Antigen presenting cells, and more precisely dendritic cells, are pivotal in directing mucosal immune responses. Three dendritic cell derived signals are required for an effective T cell response.11 The nature of signal 1 depends on the antigen in question and its processing; necessary costimulatory molecules create the second signal and the pericellular cytokine milieu is the basis of the third. On antigen recognition, maturation of dendritic cells and secretion of cytokines and chemokines occur. These secretions direct the polarisation of a naïve T helper cell to type 1, type 2, or a regulatory T cell and thus regulate other adaptive immune responses, such as B cell derived immunoglobulin production.11 Tolerance to lumenal dietary and microbial antigens is likely to be achieved through those dendritic cells which induce production of regulatory T cells secreting interleukin 10 and transforming growth factor ß. These cytokines promote gut barrier function by suppressing the production of both T helper 1 and 2 cytokines, overexpression of which is associated with increased gut permeability. Moreover, the anergic T cells induced by interleukin 10 exposed dendritic cells appear to be able to suppress other T cells in an antigen specific manner. Transforming growth factor ß downregulates both T helper 1 and 2 responses directly and indirectly by modulating the activity of antigen presenting cells and favouring the development of regulatory T cells.20 After intestinal priming, these cells migrate to the periphery, thus mediating peripheral tolerance on reactivation. In addition to its effects on T cell function, transforming growth factor ß is a key factor in IgA production and thus contributes to maintenance of gut barrier function and to immune responses at other mucosal surfaces also. Taken together, "gut barrier function" strongly depends on antigen processing and presentation and the cytokine milieu in the mucosal immune system, and determines the nature of the immune response (that is, tolerance or inflammation) elicited to a particular antigen.
"Inflammation can cause profound alterations in the function of smooth muscle and enteric nerves as well as in deeper neuromuscular layers"
In certain circumstances, such as metabolic stress, the peaceful coexistence across the barrier is disturbed and an inflammatory response ensues. Abrogated barrier function of the gut mucosa leads to greater antigen transfer when the routes of transport are also altered, thereby evoking aberrant immune responses and release of proinflammatory cytokines with further impairment of barrier function. Inflammation can cause profound alterations in the function of smooth muscle and enteric nerves as well as in deeper neuromuscular layers. Indeed, a subtle inflammatory response and exaggerated sensitivity to that type of response has been suggested to be causative in IBS. In view of recently reported alterations in the immunological defence in IBS, the trigger(s) of the vicious circle can be depicted among the intraluminal antigens.
In this issue of Gut, Atkinson and colleagues3 describe IgG antibody responses to dietary antigens of clinical significance and an apparent causal relation to symptoms in IBS, in a fashion resembling the elimination-challenge procedure in food allergy. To broaden this concept, it is intriguing to speculate that IBS may perhaps also be associated with IgG antibodies against other intraluminal antigens such as those from the indigenous microbiota, partially analogously to loss of tolerance to gut microbiota in inflammatory bowel disease.
The human gastrointestinal tract harbours a complex collection of microorganisms which form the individual microbiota typical for each person. Defence is facilitated by peristalsis, secretion of mucus and antimicrobial peptides such as defensins and cathelicidins, and commensal induced IgA. Intestinal epithelial cells further contribute to the homeostasis of gut barrier function by a scarcity of both pattern recognition receptors (PRRs; for example, toll-like receptors and nucleotide binding oligomerisation domain proteins) and their coreceptors, expression of active negative regulators of PRR signalling, and secretion of the suppressive cytokines interleukin 10 and transforming growth factor ß. All of these characteristics assist in preventing unnecessary and even hazardous systemic immunity to commensals while allowing local protective mucosal immune responses. In addition, some specific strains of non-pathogenic bacteria have been shown to attenuate intestinal inflammation by selective inhibition of intracellular signalling pathways elicited by diverse potentially deleterious stimuli. A healthy gut microbiota is thus an indispensable component of "gut barrier function".
The mechanisms responsible for IgG production against dietary antigens and their putative role in IBS. This may serve not only IBS research but also that into allergy and allergic diseases. In the perspectives of both normal gut barrier function and the vague findings in a few studies of probiotic supplementation in IBS, we suggest that the possible role of the gut microbiota in the pathogenesis of IBS may deserve closer attention. If the host-microbe cross talk is misinterpreted in IBS, a working target for novel therapeutic interventions beyond elimination diets could be provided in modulating the composition and/or activity of the gut microbiota and promoting gut immune defence. Research interest in the science of nutrition is directed towards improvement of defined physiological functions beyond the nutritional impact of food. The search for active non-nutritive compounds is also a focus for research in the treatment and prevention of allergic diseases.
IBS is likely to be a multifactorial condition involving a number of different mechanisms although the prominence of any particular factor may vary from patient to patient. However, patients often strongly believe that dietary intolerance significantly contributes to their symptomatology and some sufferers seem to benefit from eliminating certain foods from their diet. Detection of food intolerance is often difficult due to its uncertain aetiology, non-specific symptomatology, and relative inaccessibility of the affected organ. Thus most previous studies have relied on the use of exclusion diets, which are extremely labour intensive and time consuming. Attempts to "test" for food intolerance in IBS have largely focused on "classic" food allergy based on the presence of IgE mediated antibody responses, although it appears that these "immediate type" reactions are probably quite rare in this condition. It is therefore possible that adverse reactions to food in patients with IBS might be due to some other form of immunological mechanism, rather than dietary allergy.
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