Autoimmune diseases associated with dermatitis herpetiformis.
Abstract
Dermatitis herpetiformis is an autoimmune skin disease, which is strongly related to coeliac disease. Moreover, some authors accept it as the skin manifestation of coeliac disease. It is a chronic, recurrent disease with polymorphic skin eruptions and pruritus. Dermatitis herpetiformis is a disease of the young adults mostly, but can be seen at any age. It is characterized by papules, vesicles, excoriations, and urticarial plaques clinically. Histopathological examination reveals subepidermal separation, and with this finding, it needs to be differentiated from linear IgA bullous dermatitis and bullous pemphigoid. In this case, direct immunofluorescence is helpful. Granular deposition of IgA is pathognomonic for dermatitis herpetiformis. Dermatitis herpetiformis can accompany other autoimmune disorders such as type I diabetes mellitus, thyroid diseases, vitiligo, and collagen tissue diseases. Dermatitis herpetiformis is, usually, successfully treated with dapsone and gluten-free diet.
Keywords
- autoimmune
- dapsone
- gluten
- immunofluorescence
- polymorphic eruption
1. Introduction
Autoimmune bullous diseases constitute one of the main groups of dermatological diseases. One of these bullous disorders is dermatitis herpetiformis (DH). Dermatitis herpetiformis is a chronic, recurring, autoimmune, inflammatory skin disease, which is characterized by pruritic polymorphic lesions [1].
DH was first coined by the dermatologist, Louis Duhring, in 1884. Later, in 1888, Brocq identified a similar skin disease “polymorphic pruritic dermatitis.” That is why, the disease is also named as Duhring-Brocq’s disease or mostly Duhring’s disease [2].
DH and celiac disease (CD) are two entities that are strongly related. Moreover, there are evidences that claim that DH is the cutaneous manifestation of CD, because both diseases are seen in gluten-sensitive persons and share similar HLA haplotypes such as DQ2 and DQ8 [3]. Today, we know that gastrointestinal symptoms in DH are generally mild or absent. We also know that only 24% of the CD patients have skin lesions resembling DH [4]. Based on these, we can consider these two diseases as different entities that are closely related.
DH is mostly reported in Caucasians although it is being increasingly reported in the Japanese population [5, 6]. Its incidence is reported to be 11.5–75.3/100,000 in different countries [7, 8]. The disease is rare in the Far East and even rarer in Afro-Americans [9]. DH mostly affects individuals in the third or fourth decades, but patients of any age between 2 and 90 have been reported so far. For example, in Italy, there are many pediatric DH patients [10]. In the adult population, males are more commonly affected, whereas female-to-male ratio ranges from 2:1 to 4:1 in children [11].
2. Pathogenesis
The pathogenesis of DH is a complex process in which autoimmune factors, genetics, HLA predisposition, and environmental factors take part [12]. In a study of monozygotic twins, the concordance rate of the disease was found to be 0.91, which was higher than expected [13]. In two other studies, 10 and 19% of the DH patients had a first-degree relative with a diagnosis of DH [14, 15].
One possible gene associated with CD and DH is myosin 9B (MYO9B) on chromosome 9p13 [16, 17]. MYO9B regulates actin cytoskeleton functions, cell integrity, and gut barrier permeability. Increased permeability of the gastrointestinal barrier may allow more gluten penetration, and as a result, immunological processes start in CD and DH [18].
In DH, close relationship with some HLA loci has also been reported. Close association between DH and HLA-DQ2/HLA-DQ8 has been emphasized. In a study of 50 patients, 86% had HLA-DQ2 allele and the rest HLA-DQ8 allele [19].
Tissue transglutaminase (tTG) is a cytoplasmic, calcium-dependent enzyme and is the major autoantigen for CD [20]. It stabilizes the cytoskeleton and the extracellular matrix by protein polymerization. As a result, it regulates the cell matrix adhesion, cell migration, and proliferation [21, 22]. tTG is also found in the skin, dermal capillaries, and basal keratinocytes [23]. tTG acts on the alcohol-soluble part of gluten, which is the gliadin, and transforms it to an autoantigen, which has an affinity for HLA-DQ2 on antigen-presenting cells. As a result, T cells are stimulated and an inflammatory cascade starts [21, 24, 25]. In addition, tTG-gliadin complexes are formed and these complexes generate a robust autoantibody response [21, 24, 25]. This continuous inflammation causes villous atrophy and intestinal damage.
The autoantibodies in DH and CD are mostly of IgA type. Sometimes, IgG can also be seen and is important in IgA deficiency [26]. The characteristic finding of DH is the deposition of IgA in the tips of dermal papillae and along the basal membrane in a granular manner. This accumulation can be seen on direct immunofluorescence of the perilesional skin [27–29]. The IgA deposits trigger an inflammatory reaction, which results in neutrophilic deposition and vesicle formation [30].
In DH, epidermal transglutaminase (eTG) seems to be the main autoantigen rather than tTG. eTG colocalizes with IgA [27–30]. The role of eTG in the skin is the cross-linking and the maintenance of cornified envelope integrity [31, 32]. eTG is expressed in dermis, small intestine, brain, and testes. Individuals with DH have IgA antibodies specific for eTG and sometimes for tTG [29]. Blood levels of IgA-type anti-eTG antibodies are more sensitive than IgA-type anti-tTG antibodies, identifying DH [33, 34]. One recent study showed that only half of the DH patients were positive for IgA anti-eTG, claiming that other possible factors take part in the pathogenesis of the disease [27]. It was shown that skin deposits of IgA immune complexes disappear with gluten-free diet (GFD) and reappear with rechallenge supporting the effect of gluten in the pathogenesis of DH [35].
Lifestyle was also shown to affect the disease activity. For example, iodine use or iodine-rich foods (such as shellfish) cause flare of DH [36]. Triiodomethane that is used during dental procedures may also cause exacerbation of the disease [37]. In two studies, it was claimed that tobacco had protective effects in CD patients similar to that observed in ulcerative colitis. But the mechanism is unclear and is not shown in DH patients [38, 39].
3. Clinical findings
DH is characterized by polymorphic lesions such as 1–3 mm papules, vesicles, small blisters, erosions, crusts, excoriations, and secondary infections [40]. Sometimes, urticarial plaques, lichenification secondary to scratching, and purpura of the fingers and toes can also be present [41, 42]. Due to scratching, representative lesions are mostly missing and all the physician sees is excoriations. In DH, the lesions are mostly seen in the extensor aspects of the body such as the anterior thigh, elbows, knees, buttocks, shoulders, sacral region, scalp, fingers, and toes. Oral mucosa is mostly spared [43]. The lesions, if not secondarily infected, heal without scar formation but with postinflammatory hyperpigmentation. In mild disease, symptomatic and disease-free periods alternate, whereas in severe disease, the symptoms are continuous with variable severity [42]. Figure 1 demonstrates polymorphic eruption consisting of excoriated papules and erosions.
Palmoplantar purpura, which is an uncommon manifestation of DH, is mostly reported in pediatric patients. Petechiae are seen on the soles and palms sparing the dorsal surfaces. Interestingly, the dominant hands are affected more commonly suggesting that trauma can be the causative agent [44, 45]. There are also few individuals with DH, manifesting with leukocytoclastic vasculitis-like appearance, urticarial wheals, palmoplantar keratosis, and prurigo pigmentosa [46–49].
Mucosal involvement is rare in individuals with DH. Most mucosal lesions lack confirmation with direct immunofluorescence studies. These mucosal lesions are mostly thought to appear due to DH-related conditions such as CD or other autoimmune connective tissue disorders [50].
Dental abnormalities have also been reported in individuals with DH and CD. Enamel defects in permanent teeth, horizontal grooves, defects in enamel color, and enamel pits are the most commonly reported dental findings [51–53].
Only 20% of the DH patients develop gastrointestinal symptoms. These symptoms include diarrhea, anemia due to malabsorption, steatorrhea, weight loss, and malnutrition [54].
In children with DH, short stature and delayed puberty and development can be observed [55].
4. Dermatitis herpetiformis–associated disorders
DH is an autoimmune disorder and we know that different types of autoimmune disorders can coexist. Thyroid abnormalities may accompany DH. Thyroid microsomal antibodies are positive in these patients [56–58]. Thyroid involvement is mostly in the form of hypothyroidism rather than hyperthyroidism [56]. Individuals with DH have a higher risk of type I diabetes mellitus with a prevalence of 2–5% [59, 60]. Pernicious anemia, Addison’s disease, vitiligo, and alopecia areata are other autoimmune diseases that are reported to coexist with DH [61–63].
Autoimmune connective tissue diseases, such as rheumatoid arthritis, systemic lupus erythematosus, and Sjogren’s syndrome are also commonly seen in DH patients [60, 64]. Table 1 summarizes the autoimmune disorders that may accompany DH.
• Hashimoto’s thyroiditis • Type I diabetes mellitus • Pernicious anemia • Addison’s disease • Alopecia areata • Sarcoidosis • Scleroderma • Sjogren’s disease • Vitiligo • Systemic lupus erythematosus • Myasthenia gravis |
Gjone and Nordoy, in 1970, reported for the first time that individuals with DH had a higher risk of lymphoma [65]. Some other studies also reported such relationship later on [4, 66–69]. First-degree relatives of the patients with DH are believed not to have a higher risk of lymphoma, on the contrary to CD [66, 70]. There are fewer studies asserting the contrary. Lewis et al. in 2008 reported no increased risk of morbidity or mortality in DH patients [71].
5. Diagnosis
Early diagnosis of DH is essential to relieve the patient. In consequence to understanding the pathogenesis of the disease, numerous serologic tests were developed. The proper diagnosis of DH is made with the evaluation of physical examination, immunofluorescence studies, routine histopathological examination, and the serology [3].
An ideal dermatological examination starts with inspection. Suspicious lesions, mostly excoriations, are commonly distributed on extensor aspects of the body. An intact vesicle, if visible, is the most specific diagnostic lesion. The patients mostly complain of itching that exacerbates during night, which may also be helpful in the diagnosis.
Routine histopathological examination must be performed with a specimen that contains an intact vesicle if possible [72]. Diagnostic findings are subepidermal clefts and neutrophilic infiltration at the tip of the dermal papillae. Sometimes, a few eosinophils can also be seen. These abscesses formed by neutrophils and eosinophils are called Pierard microabscess [73]. A perivascular mixed inflammation is usually present [65]. The histopathology of LABD, bullous pemphigoid, and bullous lupus erythematosus can resemble such features. Immunofluorescence studies help us to differentiate these similar entities [74]. In DH, granular IgA deposition at the tips of dermal papillae is pathognomonic. In LABD, linear deposition of IgA is observed. Sometimes, in less than 5% of the patients, the granular IgA deposits in DH along the basement membrane can be evaluated as linear by mistake [3]. In Japanese patients, IgA deposition in a fibrillary pattern can also be seen [75]. The immunological deposits are not affected after pharmacological therapy. İnstead, the deposits diminish on a gluten-free diet (GFD) [76]. It must be kept in mind that IgA deposition is best seen in normal-appearing perilesional skin rather than in the lesional skin [77]. Warren et al. reported that in 35–40% of the individuals with DH, the histopathological findings are not demonstrative enough, i.e. sometimes the only finding is the perivascular lymphocytic infiltrate and/or slight dermal papillary inflammation [78]. Sometimes, apart from IgA, deposition of granular IgM and C3 at the dermoepidermal junction can also be present [79]. In Figure 2, typical deposition of granular IgA is demonstrated.
Histopathological examination of the intestine is not a must for the diagnosis of DH. But it is a known fact that even in DH patients without gastrointestinal symptoms, the inflammatory changes are present in the small bowel [80].
Serological tests are used in conjunction with pathology and immunopathology. Circulating IgA-type antibodies against endomysium are detected in both DH and CD. Endomysium is the loose connective tissue surrounding muscle fibers. This test is based on indirect immunofluorescence with monkey esophagus as the substrate [81]. IgA-type anti-tTG testing has high specificity and sensitivity and can be used to differentiate DH from LABD, in case of necessity, showing the mucosal damage [82]. Anti-eTG testing has high sensitivity and even higher specificity in diagnosis of DH. Both the levels of anti-tTG and anti-eTG reflect the level of intestinal damage. Any individual on a strict GFD shows low levels of antiendomysial, anti-tTG, and anti-eTG antibodies. Based on this, these antibodies can be used to evaluate the adherence to GFD [65]. In CD, selective IgA deficiency is seldom seen, which causes a possible delay in the diagnosis of the disease. But this is not the case for DH, i.e. IgA deficiency is not common in DH [83]. Antibodies such as antigliadin, antireticulina, antineoepitope tTG, and anti-GAF3X are also found in DH [84–86].
In individuals with DH, D-xylose absorption test is deteriorated in 10–33% of the cases. Iron deficiency anemia and megaloblastic anemia can also help to diagnose in suspicious cases [87].
Genetic testing also can be used when needed for a proper diagnosis. The absence of HLA-DQ2 and HLA-DQ8 alleles, mostly, gives the idea that the individual is unlikely to have DH. But the positivity of these alleles does not always mean that the patient has DH, because these alleles can be positive in normal population frequently [74].
Antiga and Caproni proposed a diagnostic algorithm in DH. According to this algorithm, in case of typical DIF findings and anti-tTG positivity, the diagnosis is certain. In a case with typical DIF findings but anti-tTG negativity, HLA testing is suggested. If HLA-DQ2 and HLA-DQ8 are negative, DH is excluded. If the alleles are positive, other mentioned antibodies can be checked and intestinal biopsy can be performed. In case of DIF negativity and anti-tTG positivity, HLA testing is recommended. If negative, DH can be excluded, but if positive, a new biopsy for immunofluorescence is recommended. In individuals who are negative for both DIF and anti-tTG, DH can be excluded [1].
6. Differential diagnosis
DH should be differentiated from other bullous skin disorders (such as linear IgA bullous dermatitis and bullous pemphigoid), urticaria, atopic dermatitis, nummular dermatitis, contact dermatitis, and scabies. Linear IgA bullous dermatitis (LABD) has clinical features similar to DH. Larger bullae and “crown of jewels” appearance of the lesions are characteristics of LABD. “Linear” versus “granular” deposition on direct immunofluorescence is the best way to differentiate these two entities. An oil preparation will help to distinguish scabies from DH. Histopathological examination will help to rule out the other dermatoses. Table 2 summarizes the differential diagnostic features of DH, LABD, and bullous pemphigoid.
DH | LABD | BP | |
---|---|---|---|
Lesion appearance | Excoriated papules, vesicles that coalesce | Small vesicles and/or large bullae | Tense bullae |
Distribution | Extensor and symmetrical | Extensor and symmetrical | Trunk, extremities |
Histopathology | Subepidermal bullae, neutrophils | Subepidermal bullae, neutrophils | Subepidermal bullae, sometimes eosinophils |
Direct IF | Granular IgA in dermal papillae | Linear IgA at basement membrane | Linear IgG and C3 at basement membrane |
Indirect IF | Mostly (−) | Linear IgA at BMZ | Linear IgG at BMZ |
GIS involvement | >90% | Mostly (−) | (−) |
Response to dapsone | Excellent | Good | Minimal |
7. Treatment
Gluten-free diet (GFD) is a must in the treatment of DH [88]. With GFD, not only the skin lesions resolve but also the pathological findings in intestine improve [89]. The IgA deposits disappear slowly and several years may be necessary for complete resolution. Ingestion of gluten leads to immediate deposition of IgA in the skin and polymorphic eruption arises thereafter [90]. It is tough to stick to GFD. Thus, consultation with a dietician may be necessary and helpful. Cereals (wheat, barley, and rye) and products containing cereals are rich in gluten [23]. GFD also decreases the malabsorption associated with gluten intolerance. GFD is also thought to minimize the risk of lymphoma, which is believed to be caused by continuous antigenic stimulation [91]. On GFD, gastrointestinal symptoms respond first; later on, the skin lesions respond. In the absence of an additional pharmacological therapy, it may take several years for the cutaneous lesions to disappear [65].
There are few studies that showed cases of DH refractory to GFD. In 2016, Hervonen et al. reported 7 cases out of 403 (1.7%) who were refractory to GFD [92]. In another study, this ratio was nearly 7% [88].
In terms of pharmacotherapy, sulfones like dapsone and sulfapyridine, are accepted as golden standard. These drugs suppress the cutaneous disease immediately [93, 94]. Dapsone is an anti-inflammatory and antibacterial drug which, downregulates neutrophil chemotaxis. As a result, tissue damage, triggered by neutrophils and eosinophils, is inhibited [95, 96]. Skin manifestations are relieved in a few days after dapsone initiation [97]. Usually 25–200 mg/day of dapsone is necessary to control the disease. It has been shown that dapsone alone does not improve the gastrointestinal disease. Therefore, combination of dapsone and GFD is considered as the mainstay of the treatment of DH. Some authors claim that upon strict GFD the dosage of dapsone can be lowered in time and even can be discontinued and restarted in times of flares [98].
The possible side effects of dapsone are well known. Some of the known side effects are the hematological ones such as methemoglobinemia [99]. Methemoglobinemia causes insufficient oxygen to the tissues and manifests by cyanosis, grayish-blue color, weakness, nausea, tachycardia, and abdominal pain [54]. Close follow-up is necessary to rule out this side effect, especially at the beginning of the therapy. To decrease the possibility of methemoglobinemia, cimetidine and/or vitamin E supplement can be prescribed [50]. Patients with glucose-6-phosphate dehydrogenase (G6PD) are more likely to develop hemolysis [100]. The dosage of dapsone must be lowered in these patients. Agranulocytosis is a rare but serious complication and is almost always seen at the beginning of the therapy [101]. Systemic drug hypersensitivity syndrome is another side effect of dapsone treatment, which must also be kept in mind [102]. The sulfone syndrome is seen in the first 2 months of the treatment. Exfoliative dermatitis, fever, lymphadenopathy, hepatitis, vomiting, and hemolysis are independent from the dosage [103, 104]. Table 3 summarizes the possible side effects of dapsone.
Adverse effects of dapsone | |
---|---|
Blood abnormality | Hemolytic anemia |
Methemoglobinemia | |
Agranulocytosis | |
Leukopenia | |
Gastrointestinal side effects | Nausea |
Hepatitis | |
Cholestasis | |
Hypoalbuminemia | |
Neurological side effects | Headache |
Peripheral neuropathy | |
Dizziness | |
Insomnia | |
Psychosis | |
Cutaneous reactions | Maculopapular eruption |
Urticarial reaction | |
Fixed drug eruption | |
Erythrodermia | |
Stevens-Johnson syndrome | |
Phototoxicity | |
Drug-induced lupus erythematosus | |
Dapsone hypersensitivity | Hepatitis |
Fatigue | |
Anorexia | |
Lymphadenopathy |
Sulfapyridine, which is the metabolite of both sulfasalazine and sulfamethoxypyridazine, is another therapeutic option in the treatment of DH. The mechanism of action is similar to that of dapsone [105].
Systemic steroids are usually reported to be useless in the treatment of DH [92]. In some instances, potent topical steroids can be used to relieve pruritus [106]. Topical steroids must be used during the acute stage together with the above-mentioned systemic agents.
Tetracycline and nicotinamide combination, colchicine, heparin, and cyclosporine are reported to be effective in the treatment of DH. But there are mostly limited case reports about these treatment options and they need further, large studies [107–109]. Sacchidanand, in 2003, reported good results in DH patients with dexamethasone-cyclophosphamide pulse therapy [110]. Topical dapsone, mycophenolate, and rituximab have also been used for the treatment of DH with variable results [111, 112].
DH has a chronic nature with remissions and flares. That is why close consultation, long-term GFD, and pharmacological treatment are necessary. In the course of the disease, regular screening for other autoimmune diseases and neoplastic conditions is generally recommended. Blood samples should be taken, at regular intervals, to monitor the possible side effects of the drugs. Anti-tTG and anti-eTG IgA levels can be used to evaluate the adherence of the patients to GFD.
Spontaneous remissions that last months or years are rarely reported. A spontaneous remission is mentioned when there are no lesions for at least 6 months without adherence to GFD [42].
8. Childhood dermatitis herpetiformis
DH, in childhood, resembles the disease of the adulthood with some exceptional features. DH is most commonly seen between the ages of 2 and 7. Girls and boys are equally affected [113]. DH in childhood has an insidious course. It has a long period of pruritus, which is lesion free. The lesions are usually scattered in an asymmetric manner in contrast to adulthood form, which tends to coalesce [114]. Facial lesions are more common in childhood. Palmar linear petechiae and bullae are mostly seen in the childhood form. Chronic urticarial lesions, chronic dermatitis, and hemorrhagic bullae can accompany the classical lesions [48]. Aforementioned enamel defects, oral erosions, and chronic diarrhea can also be seen in the affected children [52, 53, 115].
Interestingly, children with DH can respond to topical steroid treatment initially. This response, at the beginning, diminishes in time [116]. Dapsone is the golden standard in terms of treatment. About 2 mg/kg/day is generally enough to control the disease. The response starts in 72 hours. After satisfactory response, the dosage can be lowered. The second choice is sulfapyridine at a dose of 35–70 mg/kg/day [96].
9. Conclusion
Dermatitis herpetiformis, when undiagnosed, is a distracting disease for the patient with its chronic nature and the itching. In case of a polymorphic eruption and pruritus, DH must come to mind. After proper history taking, physical examination, and laboratory investigations, its diagnosis is, mostly, easy. GFD and dapsone ensure an untroubled life for the patient. But we should, always, be aware of the possible side effects of the therapy.
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