Background
Pemphigus is derived from the Greek word pemphix meaning bubble or blister. Pemphigus describes a group of chronic bullous diseases, originally named by Wichman in 1791. The term pemphigus once included most bullous eruptions of the skin, but diagnostic tests have improved, and bullous diseases have been reclassified.
The term pemphigus refers to a group of autoimmune blistering diseases of the skin and mucous membranes characterized histologically by intraepidermal blister and immunopathologically by the finding of in vivo bound and circulating immunoglobulin G (IgG) antibody directed against the cell surface of keratinocytes. The 3 primary subsets of pemphigus include pemphigus vulgaris, pemphigus foliaceus, and paraneoplastic pemphigus.[1] Each type of pemphigus has distinct clinical and immunopathologic features. Pemphigus vulgaris accounts for approximately 70% of pemphigus cases.
Pathophysiology
Pemphigus vulgaris is an autoimmune, intraepithelial, blistering disease affecting the skin and mucous membranes and is mediated by circulating autoantibodies directed against keratinocyte cell surfaces. In 1964, autoantibodies against keratinocyte surfaces were described in patients with pemphigus. Clinical and experimental observations indicate that the circulating autoantibodies are pathogenic. An immunogenetic predisposition is well established.
Blisters in pemphigus vulgaris are associated with the binding of IgG autoantibodies to keratinocyte cell surface molecules. These intercellular or pemphigus vulgaris antibodies bind to keratinocyte desmosomes and to desmosome-free areas of the keratinocyte cell membrane. The binding of autoantibodies results in a loss of cell-to-cell adhesion, a process termed acantholysis. The antibody alone is capable of causing blistering without complement or inflammatory cells.
Pemphigus vulgaris antigen
Intercellular adhesion in the epidermis involves several keratinocyte cell surface molecules. Pemphigus antibody binds to keratinocyte cell surface the molecules desmoglein 1 and desmoglein 3. The binding of antibody to desmoglein may have a direct effect on desmosomal adherens or may trigger a cellular process that results in acantholysis. Antibodies specific for nondesmosomal antigens also have been described in the sera of patients with pemphigus vulgaris; however, the role of these antigens in the pathogenesis of pemphigus vulgaris is not known.
Antibodies
Patients with the mucocutaneous form of pemphigus vulgaris have pathogenic antidesmoglein 1 and antidesmoglein 3 autoantibodies. Patients with the mucosal form of pemphigus vulgaris have only antidesmoglein 3 autoantibodies. Patients with active disease have circulating and tissue-bound autoantibodies of both the immunoglobulin G1 (IgG1) and immunoglobulin G4 (IgG4) subclasses.[2, 3]
More than 80% of the patients with active disease produce autoantibodies to the desmosomal protein desmoglein. Disease activity correlates with antibody titers in most patients.[4] In patients with pemphigus vulgaris, the presence of antidesmoglein 1 autoantibodies, as determined by enzyme-linked immunosorbent assay (ELISA), is more closely correlated with the course of the disease compared with antidesmoglein 3 autoantibodies. Lack of in vivo antibody binding (reversion to a negative result on direct immunofluorescence) is the best indicator of remission and can help predict a lack of flaring when therapy is tapered.
Complement
Pemphigus antibody fixes components of complement to the surface of epidermal cells. Antibody binding may activate complement with the release of inflammatory mediators and recruitment of activated T cells. T cells are clearly required for the production of the autoantibodies, but their role in the pathogenesis of pemphigus vulgaris remains poorly understood. Interleukin 2 is the main activator of T lymphocytes, and increased soluble receptors have been detected in patients with active pemphigus vulgaris.
Epidemiology
Frequency
United States
Pemphigus vulgaris is uncommon, and the exact incidence and prevalence depends on the population studied.
International
Pemphigus vulgaris has been reported to occur worldwide. Pemphigus vulgaris incidence varies from 0.5-3.2 cases per 100,000 population. Pemphigus vulgaris incidence is increased in patients of Ashkenazi Jewish descent and those of Mediterranean origin. Few familial cases have been reported.
Mortality/Morbidity
Pemphigus vulgaris is a potentially life-threatening autoimmune mucocutaneous disease with a mortality rate of approximately 5-15%.[5] Mortality in patients with pemphigus vulgaris is 3 times higher than the general population. Complications secondary to the use of high-dose corticosteroids contribute to the mortality rate. Morbidity and mortality are related to the extent of disease, the maximum dose of systemic steroids required to induce remission, and the presence of other diseases. Prognosis is worse in patients with extensive pemphigus vulgaris and in older patients.
Pemphigus vulgaris involves mucosa in 50-70% of patients. This may limit oral intake secondary to dysphagia. Blistering and erosions secondary to the rupture of blisters may be painful and may limit the patient's daily activities. Additionally, Patients with pemphigus vulgaris typically heal without scarring unless the disease is complicated by severe secondary infection.
Race
Pemphigus vulgaris affects persons of all races. The prevalence of pemphigus vulgaris is high in regions where the Jewish population is predominant.[6] For example, in Jerusalem, the prevalence of pemphigus vulgaris is estimated at 1.6 cases per 100,000 population; in Connecticut, the prevalence has been reported as 0.42 cases per 100,000 population.[7] The incidence in the United Kingdom is 0.68 case per 100 000 persons per year. The incidence of pemphigus vulgaris in Tunisia is estimated at 2.5 cases per million population per year (3.9 in women, 1.2 in men), while in France, the incidence is 1.3 cases per million population per year (no significant difference between men and women).[8] In Finland, where few people of Jewish or Mediterranean origin live, the prevalence is low, at 0.76 case per million population.[9]
Sex
The male-to-female ratio is approximately equal. In adolescence, girls are more likely to be affected than boys.
Age
The mean age of onset is approximately 50-60 years; however, the range is broad, and disease onset in older individuals and in children has been described. Patients are younger at presentation in India than in Western countries.[10]
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