Potential contribution of anti-p200 autoantibodies to mucosal lesions in anti-p200 pemphigoid

Abstract

Anti-p200 pemphigoid is a relatively rare subepidermal autoimmune bullous disease (AIBD), which was firstly reported by Detlef Zillikens, Takashi Hashimoto and others in 1996. Skin lesions are considered as the major clinical features of this disease, with occasional involvement of mucosal lesions. The mechanism of mucosal lesions involved in anti-p200 pemphigoid is still unclear. In the present study, we aimed to analyze published data on cases and case series of anti-p200 pemphigoid with mucosal lesions and explored the potential contribution of anti-p200 autoantibodies to mucosal lesions. A total of 32 papers that comprised 52 anti-p200 pemphigoid patients with various mucosal lesions were included in this review. Oral lesions were involved in 75.0% patients, followed by genital lesions (26.9%) and ocular lesions (11.54%). Only one patient had psoriasis, 26.9% patients had multiple mucosal lesions, and 30.8% cases had comorbidity of other AIBDs, particularly anti-laminin (LM) 332-type mucous membrane pemphigoid (MMP). In comparison with anti-LM332-type MMP, anti-BP180-type MMP and epidermolysis bullosa acquisita, higher frequency of genital lesions was identified as a unique character of anti-p200 pemphigoid with mucosal lesions. These results indicated that anti-p200 autoantibodies might contribute to mucosal lesions in a pattern different from other MMP-related autoantibodies, although its pathogenetic mechanisms are still unclear.

Introduction

Subepidermal autoimmune bullous diseases (AIBDs) are a group of rare autoimmune skin diseases characterized by autoantibodies against epidermal basement membrane zone (BMZ) proteins, which include bullous pemphigoid (BP), mucous membrane pemphigoid (MMP), anti-p200 pemphigoid, epidermolysis bullosa acquisita (EBA) and others (1). The anti-BMZ autoantibodies disrupt the epidermal cell adhesive function and anchoring mechanism within epidermal-dermal junction, leading to the separation of skin and/or mucous membranes and the formation of blisters and/or erosions.

Anti-p200 pemphigoid was first reported in 1996 in two papers by Detlef Zillikens, Hashimoto and others and by Chen, Hashimoto and others, as a novel AIBD disease entity with IgG autoantibodies against a 200-kDa dermal protein (p200) (2, 3). Then, Kawahara, Detlef Zillikens, Hashimoto and others showed that p200 is localized in the lower lamina lucida of the epidermal BMZ (4). In 2009, Dainichi, Hashimoto and others reported that p200 is possibly LMγ1 (5, 6), although there might be other candidate molecules as p200.

Anti-p200 pemphigoid presents mainly skin lesions and occasionally mucosal lesions. The clinical presentation of anti-p200 pemphigoid is polymorphic, and may mimic to those of other subepidermal AIBDs, such as BP and EBA (7). A number of studies reported that anti-p200 pemphigoid is often associated with psoriasis (8). Histopathologically, lesional skin biopsy specimen shows subepidermal blister with prominent inflammatory infiltrations of neutrophils, followed by lymphocytes and eosinophils (4).

Diagnosis of anti-p200 pemphigoid is based on clinical, histopathological and immunological findings, particularly the presence of anti-p200 autoantibodies. In anti-p200 pemphigoid, direct immunofluorescence (DIF) using patient perilesional skin/mucosa usually shows linear deposits of IgG and C3 to the BMZ (9–13). Indirect immunofluorescence (IIF) using normal human skin detects circulating IgG antibodies to the BMZ (14–17), which reacts with dermal side of 1M NaCl-split normal human skin (ssIIF) (14, 18–21). Immunoblotting (IB) using normal human dermal extract detects IgG reactivity with p200 (14, 22–25).

In some cases of anti-p200 pemphigoid, additional autoantibodies to LM332, BP180, type VII collagen and BP230 were also detected (10, 22, 26–28).

Although autoantibodies in anti-p200 pemphigoid sera are considered to be pathogenic, their pathogenicity is not yet fully elucidated (29, 30).

MMP is a rare and chronic mucosal-dominant subepidermal AIBD. Known autoantigens of MMP include BP180, BP230, LM332, integrin α6β4 and type VII collagen (31). Recently, our group presented a unique AIBD case with only oral mucosal lesion, which was positive for p200 but negative for all known MMP-related autoantigens. We considered that the anti-p200 autoantibodies might cause the mucosal lesions, and suggested the new MMP subtype, anti-p200 MMP (14).

In the present study, we summarized the clinical, histopathological and immunological features of anti-p200 pemphigoid presented with mucosal lesions published either as sporadic case reports or in case series, for the better understanding of the potential contribution of anti-p200 autoantibodies to development of mucosal lesions.

Materials and methods

Literature review and article selection

A literature review was performed on PubMed (1996–2022) for anti-p200 pemphigoid cases by using the terms, p200, laminin gamma 1, lamγ1, LMγ1, anti-p200, anti-laminin gamma 1, anti-lamγ1, anti-LMγ1, anti-p200 pemphigoid, anti-laminin gamma 1 pemphigoid, anti-lamγ1 pemphigoid, anti-LMγ1 pemphigoid. Articles published in English were considered for eligibility. We also screened the references of the included studies for additional eligible publications. Then, a literature review on anti-p200 pemphigoid was conducted for several criteria between the cases with mucosal lesions and the cases only with skin lesions by statistical evaluation.

Selection criteria

All the studies reporting one or more cases with a diagnosis of anti-p200 pemphigoid were included. Criteria for the diagnosis were listed below:

• clinical manifestations of subepidermal AIBD.

• linear deposition along the BMZ on DIF or showing positive signal along the dermal side of the split skin on ssIIF.

• positive signals for p200/LMγ1 by IB using human dermal extract or recombinant proteins of LMγ1.

• exclusion of other subepidermal AIBDs.

Data extraction

Each screened article was critically reviewed. The following variables were gathered as available: age, sex, location, final diagnosis, clinical features, histopathology, immunological profiles and associated comorbidities. According to the autoantigens detected, we classified the patients into two subgroups, “sole p200”, which reacted only with p200, and “multiple antigens (Ags)”, which reacted with p200 and other antigen(s).

Data analyses

The clinical, histopathological and immunological features of anti-p200 pemphigoid with mucosal lesions were summarized, and compared with anti-p200 pemphigoid only with skin lesions, other MMPs and EBA. The statistical analyses were performed using chi-square test, fisher exact test by SPSS software, version 23 (SPSS, Chicago, IL, USA). The p values less than 0.05 were considered as statistically significant.

Results

Demographic characteristics and diagnosis of the patients

From the literature, we selected total of 154 anti-p200 pemphigoid patients, among whom, 52 (33.8%) patients presented with mucosal lesions. The demographic characteristics of these 52 patients were summarized in Table 1. These 52 patients, reported from eight countries, were composed of 30 males (age, mean ± SD, 63.7 ± 16.0), 19 females (58.7 ± 21.8) and 3 with no gender information. There are no statistical differences for ages of disease onset among different countries (all p>0.05). In these 52 cases, 38 (73.1%) were diagnosed as exclusively anti-p200 pemphigoid, while 14 (26.9%) were diagnosed as anti-p200 pemphigoid concurrent with other AIBDs or other autoantibodies, and 9 of the 14 patients were associated with anti-LM332-type MMP.

The clinical, histopathological and immunological features of the 52 cases of anti-p200 pemphigoid with mucosal lesions

Clinically, 52 cases had mucosal lesions on the oral (75.0%), genital (26.9%), ocular (11.5%), nasal (9.6%), pharyngeal (1.9%) and esophageal (1.9%) mucosae (Table 2). Fourteen (26.9%) cases showed lesions on multiple mucosal sites, including 3 cases on 4 sites, 2 cases on 3 sites and 9 cases on 2 sites (Table 3). In these 14 cases with multiple mucosal lesions, oral, genital, ocular, nasal lesions were found in 14, 10, 5 and 5 cases, respectively (Table 3).

Skin lesions were found in 51 of the 52 patients, however, only one patient was associated with psoriasis. In addition, there are two patients associated with malignancies, metastatic ovarian carcinoma and metastatic esophageal carcinoma (Table 2).

Histopathologically, 49 patients had pathological reports, which showed subepidermal blistering (98.0%), and inflammatory infiltrations of neutrophils (46.9%), eosinophils (38.8%) and lymphocytes (18.4%) (Table 2).

Concerning the results of immunofluorescence tests, the positive rates of IgG (Figure 1A) and C3 (Figure 1B) depositions to BMZ in DIF were 94.4% and 97.1%, respectively, positive IgG reactivity rate in IIF of normal human skin (Figure 1C) was 80.0%, and positive IgG reactivity with dermal side in ssIIF (Figure 1D) was 97.2%. A few patients showed IgA and/or IgM autoantibodies in these immunofluorescence tests (Table 2). By IB of human dermal extract, the positive rates of IgG against the 200 kDa p200 were 97.8%. In addition, anti-p200 autoantibodies were also detected by IB of various LMγ1 recombinant proteins in some cases (Table 2).

Figure 1

IgG autoantibodies targeting non-p200 autoantigens were reported in 30.8% patients. The autoantibodies against additional antigens, LM332 in 9 cases, BP180 in 6 cases, Type VII collagen in 2 cases and BP230 in one case were also detected. Moreover, for IgG autoantibodies against LM332, LMγ2 subunit was the most frequently recognized, followed by LMβ3 and LMα3 subunits (Table 2).

Because of the lack of detailed information for the treatments in most cases, we did not analyze the treatments in the present study.

The clinical, histopathological and immunological results of two subgroups of anti-p200 pemphigoid with mucosal lesions

According to the autoantigens detected, the 52 cases of anti-p200 pemphigoid with mucosal lesions were divided into two subgroups as sole p200 Ag-M (sole p200 antigen-anti-p200 pemphigoid with mucosal lesions) subgroup (36 cases), which reacted only with p200, and multiple antigens (Ags)-M (multiple antigens-anti-p200 pemphigoid with mucosal lesions) subgroup (16 cases), which reacted with p200 and other antigens. The detailed clinical, histopathological and immunological features of these two groups were summarized in Table 2.

Patients in sole p200 Ag-M and multiple Ags-M subgroups showed similar clinical, histopathological and immunological features, except that multiple Ags-M subgroup (25.0%) had higher ratio of nasal lesions than sole p200 Ag-M subgroup (2.8%) (p<0.05) (Tables 4 and 5).

Comparative analyses of the data of sole p200 Ag-M subgroup with two more subgroups of anti-p200 pemphigoid with only skin lesions

In the present study, the sole p200 Ag-M subgroup is the most important group to explore the potent contribution of anti-p200 autoantibodies to mucosal lesions. Therefore, sole p200 Ag-M subgroup was next employed to compare with two more subgroups of anti-p200 pemphigoid with only skin lesions, designated as sole p200 Ag-S (sole p200 antigen-anti-p200 pemphigoid only with skin lesions) subgroup (82 cases), which reacted only with p200, and as multiple Ags-S subgroup (multiple antigens-anti-p200 pemphigoid only with skin lesions) (20 cases), which reacted with p200 and other antigens.

Except for mucosal lesions, the sole p200 Ag-M subgroup (0%) contained a significantly lower percentage of psoriasis than the sole p200 Ag-S subgroup (31.7%) and multiple Ags-S subgroup (30%) (both p<0.05) (Tables 4 and 5).

Comparative analyses of the data of sole p200 Ag-M subgroup with two MMP groups and EBA group

The clinical and immunological features of anti-LM332-type MMP group (55 cases) (43), anti-BP180-type MMP group (332 cases) (44) and EBA group (105 cases) (45) were shown in Tables 4 and 5.

Compared with anti-LM332-type MMP group, sole p200 Ag-M subgroup had significantly lower ratios on oral, ocular, pharyngeal and laryngeal lesions (all p<0.05), and higher ratio on skin lesions (p<0.05).

Compared with anti-BP180-type MMP group, sole p200 Ag-M subgroup had significantly lower ratios on ocular and pharyngeal lesions (both p<0.05), and higher ratios on genital lesions, single mucosal site lesion and skin lesion (all p<0.05).

Compared with EBA group, sole p200 Ag-M subgroup had significantly higher ratios on genital and skin lesions (both p<0.05), and higher ratio for IgA reactivity to the dermal side on ssIIF (p<0.05).

Discussion

In the present study, 52 cases of anti-p200 pemphigoid with mucosal lesions from the literature were investigated for the potential contribution of anti-p200 autoantibodies to mucosal lesions. In these 52 cases, oral and genital lesions were the two most frequent mucosal lesions, 26.9% cases had lesions on multiple mucosal sites, in which oral and genital mucosae were also the most frequently affected mucosal sites.

Based on the results of autoantigens detected, the 52 cases of anti-p200 pemphigoid with mucosal lesions were classified into two subgroups, sole p200 Ag-M (36 cases), and multiple Ags-M (16 cases), both of which were similar in terms of clinical, histopathological and immunological features, except for higher ratio of nasal lesions appeared in multiple Ags-M subgroup.

Except for mucosal lesions, sole p200 Ag-M subgroup also showed lower frequency of psoriasis, when compared with other two subgroups of anti-p200 pemphigoid with only skin lesions, i.e., sole p200 Ag-S subgroup (82 cases) and multiple Ags-S subgroup (20 cases).

To determine the possible differences in the contribution to develop mucosal lesions between autoantibodies against p200 and other known MMP autoantigens, we next compared sole p200 Ag-M subgroup with anti-LM332-type MMP and anti-BP180-type MMP groups. The results indicated that anti-p200 autoantibodies might induce less frequently oral, ocular, pharyngeal and laryngeal lesions compared with anti-LM332 autoantibodies, while anti-p200 autoantibodies might produce less frequently ocular and pharyngeal lesions but more frequently genital lesions and single mucosa lesion, when compared with anti-BP180 autoantibodies.

Sole p200 Ag-M subgroup were also compared with EBA group, because both p200 and type VII collagen (EBA autoantigen) were located in dermal side of 1M NaCl-split skin. The results indicated that anti-p200 autoantibodies might induce more frequently genital and skin lesions when compared with anti-type VII collagen autoantibodies.

Importantly, anti-LM332-type MMP was the most commonly associated AIBD in anti-p200 pemphigoid with mucosal lesions, which further emphasize the necessity of detection of anti-LM332 autoantibodies in anti-p200 pemphigoid with mucosal lesions.

The results of the present study suggest that, in addition to LM332 and BP180, p200 is an important autoantigen of MMP. Therefore, anti-p200 pemphigoid with extensive mucosal lesions could be considered as anti-p200 MMP. Anti-p200 pemphigoid and anti-p200 MMP show the same autoantigen but different clinical features, which is the similar situation for BP and anti-BP180-type MMP.

IB of dermal extract is usually not used for the diagnosis of MMP, because this assay was mainly used for detection of antibodies to EBA antigen (type VII collagen) and p200. However, the results in the present review suggested the importance of IB of dermal extract for serological diagnosis of MMP, because p200 is also one of autoantigens of MMP. We occasionally encounter MMP cases, which do not show autoantibodies against known MMP-related autoantigens, such as LM332, BP180 and integrin α6β4. In this situation, we would like to suggest detection of autoantibodies against p200.

This review was summarized and analyzed on the information from patients previously reported as case reports and case series. These published articles were not completely comprehensive, and some of them were only recorded with the clinical data and simple medications. Due to lack uniformity information, therapy profile was not analyzed. Additionally, 52 cases of anti-p200 pemphigoid with mucosal lesions in the literature were originated from only eight countries, which is possibly because very few countries have the abilities to diagnose this disease. Anti-BP180-type MMP group used in the present study is not a pure group with only anti-BP180 antibodies, which might influence the comparative results.

In summary, anti-p200 pemphigoid with mucosal lesions showed unique clinical features of higher frequency of genital lesions and very rare psoriasis, and distinct immunological features of high incidence of cooccurrence of autoantibodies against LM332. p200 is also a very important autoantigen of MMP. The epitopes and pathogenesis of anti-p200 autoantibodies were still inconclusive.

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