REVIEW ARTICLE Walaiorn Pratchyapruit, M.D. Patchnee Tohtubtiang, M.D. Institute of Dermatology
■The purpose of the authors is to familiarize the logic inflammatory cells namely: eosinophils, polymor-
readers with the principles that master the diagnosis
phonuclear cells, mast cells, macrophages involve in
and management of bullous pemphigoid (BP), its
pathophysiologic process of BP (see detail in part I).
variants and pemphigoid gestationis (PG). Our aim
This topic will describe only some interesting practical
was not to be all-inclusive but illustrative. There are
some other points of view on BP that have not been
discussed here because of the limited scope of this
article. As mentioned earlier in part I, BP the most
Most common presentation of BP is generalized
common chronic acquired autoimmune bullous dis-
bullous form. There are multiple tense blisters on
ease, most affects elderly patients. BP autoantibodies,
erythematous base or normal skin with a predilection
most common IgG, react against hemidesmosomal
on the trunk and flexural areas. The lesions usually
protein of skin basement membrane zone (BMZ) then
heal without scarring or milia formation. This clinical
activates complement and inflammatory mediators;
finding makes it different from EB or EBA. Some
cytokines and proteinase to degrade hemidesmosomal
patients initially present with pruritic urticarial, irreg-
proteins. NC16a domain is now considered to be the
ular bordered plaques. Nearly two-thirds of the pa-
most pathogenic site of BP.1 Many types of immuno-
tients had prodromal symptoms. These eruptions, par-
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ticularly as an early symptom, may cause misin-
reveals IgG on the blister roof (epidermal side of split
terpretation in patients with BP.2 The duration of the
prodromal eruptions was up to 6 weeks if papular
It is not known when in the course of the disease
and/or urticarial and up to 2 years if eczematous,
the DIF will be positive. Some patients have IIF-
before the blisters appeared. About 10-25% of BP
positive 1 and 2 weeks respectively before the blisters
patients have mucous membrane involvement. Fifty
appeared. The diagnosis of BP can be archieved in
percent of oral pemphigoid patients have been re-
most patients by the above tests. However, some
ported to experience disease progression to involve
cases need laborious investigative techniques such as
other mucosal tissues, including the eye and larynx.3
immunoblotting and immuno precipitation, which may
BP has better prognosis than other blistering dis-
eases. Courses of disease are vary. If untreated, the
disease can persist for months or years, with periods
of spontaneous remission and exacerbation. In most
1. Chronic bullous disease of childhood (CBDC)
treated patients, BP remits within 5 years and has
long-term remission after that. The present report of
mortality rate is about 6-41% most due to side effect
of treatment and secondary infection. Disease activity
relates to circulating immune complex levels and
serum levels of Ab to BP180 NC16a, but not relates
BP may present with several distinct clinical
The following tests should be performed to
1. Histopathologic analysis from normal-appear-
ing perilesional skin shows subepidermal blister with
CP as a clinical subset of BP, characterized
by chronic inflammation and scarring at the mucous
2. DIF study presents deposits of IgGs (70-90%
membrane, especially the oral and ocular mucosae.
of patients) and complement C3 (90-100% of patients)
Sometimes, minimal skin involvement is obscured.
However, it differs from BP in some significant ways:
3. IIF study shows the presence of circulating
(a) in CP mucosal involvement with clinical scarring
IgG in the patientsû serum at BMZ. The SSS substrate
is prominent; (b) there is a prominent IgA antibody
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response alone or in addition to the IgG antibody
There is much overlap among the three types
response; and (c) there is a heterogeneous antibody
of localized cutaneous BP; BPP, OCP, MMP-CP.
response in CP. Esophageal involvement in CP is a
They all tend to affect the same age group, in general,
rare, but often devastating manifestation. CP has been
and may remain regional or be associated with a
referred to by a variety of designations based largely
generalized eruption consistent with BP. DIF findings
on its site of involvement. Occular CP with clinical
are identical, as well, with linear IgG and C3 at the
disease restricted to ocular mucosa is characterized
BMZ. IIF tends to be negative for all three variants,
by the absence of circulating Abs and the presence
with a tendency to positivity with increased extent
of in vivo-bound fibrin deposition at the patientsû
and severity of skin involvement. There are diffe-
BMZ. Anti-laminin-CP are reported to have IgG Abs
rences, though, between them. BPP tends to affect men
targeting a lower LL component epiligrin. Brunsting-
more than women and lacks mucous membrane
Perry pemphigoid (BPP) described in patients with
involvement. BPP is unlike benign MMP-CP (BMMP-
locally recurrent and scarring subepidermal blistering
CP) and localized cutaneous nonscarring BP. Localized
cutaneous non-scarring BP usually involves the legs,
whereas the other two conditions affect the head and
prises a heterogeneous group of disorders characterized
neck, with resultant scarring. Histology is similar to
by subepidermal separation and the deposition of Igs
that seen in BP, but dermal fibrosis and sclerosis result
and complement along the BMZ. MMP affects 2-5
in skin affected by BMMP-CP and BPP. Localized
cases per 100,000 and more than 85% of patients have
cutaneous nonscarring BP is more amenable to topical
oral involvement. MMP is now the preferred term
steroid therapy, whereas BMMP-CP and BPP are
when the condition is primarily mucosal, and BP when
more persistent and resistant to systemic immuno-
the condition primarily involves the skin. Oral variant
suppressive therapy. Clinical, histologic, and immu-
or MMP always presents with erosive patches and
nologic similarities among the pemphigoid variants
desquamative gingivitis.8 Ocular CP, the patients have
may reflect common antigenic features. On the other
disease that is limited to conjunctival mucous mem-
hand, clinical, histologic, and immunologic differences
brane. It begins as a non-specific chronic conjunctivitis
may imply that there are more than one BP antibody
leading progressively to subconjunctival fibrosis with
directed at a variety of antigenic structures (as Table
symplepharon formation and forniceal shortening, fi-
nally resulting in blindness. In contrary to pemphigus
vulgaris, two-thirds of the BP cases begin with oral
leison-mainly the buccal mucosa and palate, rarely the
present with a persistent vesiculobullous eruption
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similar to dyshidrosiform dermatitis.
A patient gives history of intensive pruritus
and excoriated papules resembling subacute prurigo.
It presents as dermatitis herpetiformis-liked
Histopathologic study shows signs of chronic derma-
lesion, but granular IgA autoantibody at dermal pa-
titis, whereas findings by DIF and IIF are compatible
pillae should not be found. An unusual generalized
with BP. The autoantibodies show the same specificity
vesicular eruption in the pediatric warrant this diag-
LPP is a very rare clinical variants of BP.
The overlapping clinical features of both
LPP may be due to intake of drugs such as cinnarizine,
prurigo nodularis and BP lesions are present. It is
captopril, ramipril, furosemide and simvastatin.19 One
more common in elderly women and is relatively
case has skin lesion associating with hepatitis B viral
resistant to therapy.16 The blisters arising from nor-
infection.20 The patient with LPP has bullae arising
mal-appearing or nodular skin but it may or may not
on lichen planus papules and on uninvolved skin. The
develop in some patients.17 They has fulfilled criteria
lesion confines on the face, neck, trunk, elbows, and
of BP by histopathologic examination, DIF and IIF
feet. Histologic study reveals subepidermal blister.
studies. The nodular plaque skin shows an expression
The localization of the immune deposits is consistent
of alpha-6 and beta-1 integrin subunits, mediators of
with a diagnosis of BP, CP, EBA. A linear deposits
matrix-cell signaling and proliferation, at the basal and
of IgG,C3 and cytoid bodies along the BMZ on IIF
the suprabasal epidermis which is a pattern of hyper-
of peribullous skin demonstrates IgG deposited on the
proliferative dermatoses.18 The role of anti-BMZ Abs
epidermal side of SSS support the diagnosis.21 Sera
in the development of the eruption, or the role of the
from some patients with LPP bind to C-terminal
eruption in the development and persistence of Abs,
portions of NC16a. One caseûs serum reacts to BP180
is not clear. In these variants of BP, the presence of
Ag and 200 kDa Ag.22 Only a few cases have been
Abs may not sufficient for the development of
blisters.17 One case has IgA anti-intercellular Abs
(intracellular domain of desmoglein 1) in addition
to IgG anti-BMZ Abs. Interestingly, sera from both
localized BP and pemphigoid nodularis showed
Bullae may arise at the site of pre-existing
a lower end point of titer of Ab to NC16a do-
LP-like or prurigo nodularis-like eruptions, and clini-
cally uninvolved skin. DIF finding of linear deposits
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of IgG and/or C3 at the BMZ in perilesional skin
characterized by an erythroderma with or without
is found. The disease spectrum of LPP and pem-
blister formation.24,25 The patients with erythrodermic
phigoid nodularis differs from that of classical BP
BP have circulating IgGs bind to the epidermal side
phenotype, and their presentations are often indolent.
of SSS in a pattern identical to generalized BP.
LPP may predominantly affect a younger age group
Immunoprecipitation study reveals that patients with
and is responsive to standard treatments used in
erythrodermic BP has circulating IgG which recognizes,
acquired ABD, while pemphigoid nodularis is more
to varying degrees, the 230 and 180 kDa BPAgs.
common in elderly women and is relatively resistant
However, sera from erythrodermic patients without
to therapy. LPP lesion may persist for long period
blisters fails to recognize any specific polypeptides.24
of time before subsequently developed a nodular
eruption with a concurrently detected anti BP180
The elderly patients present with a prodromal
generalized pruritus as the dominant or single pre-
senting feature. Some patients have rare vesicles at
It is defined by the concurrence of BP and
presentation. All have excoriations and some cases
LP lesions. The patients have a severe lichenoid
presents with minimal urticarial or eczematous pa-
erythroderma associated with BP lesion involving the
pules. Routine skin biopsies are largely nonspecific.
skin and mucosa. Histologic and DIF of skin and
All patients have confirmation of the diagnosis by
mucosal lesion are consistent with the diagnosis of
either IIF or DIF or both. It joins the remarkable
BP associated with a lichenoid dermatitis. Immunoblot
clinical finding of generalized pruritus with the un-
analysis of sera detected anti-BP230 and anti-BP180.
derlying diagnosis of BP. Elderly patients with severe
IEM shows IgG deposit localizes in the LL and the
or persistent unexplained generalized pruritus should
HD. The patients have the common HLA-DR 10
have IF testing to exclude BP as the cause of the
haplotype. This a particular type of lichenoid erythro-
generalized pruritus. Establishing an early diagnosis
dermic BP is probably determined by genetic fac-
permits the prompt institution of effective therapy.
tors.23 Interestingly, other autoimmune bullous skin
diseases such as paraneoplastic pemphigus or bullous
lupus erythematosus may also be associated with
It has clinical manifestation similar to pem-
phigus vegetans. Most patients present with multiple
well-circumscribed, erythematous, erosive, and vegeta-
ting plaques at intertriginous region such as axilla,
Erythrodermic BP is a very unusual variant,
inframammary†and†neck. However,†histopathologic
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and immunological studies show a typical BP. Immu-
LVPC). Clinical†features†and†immunopathological
noblot analysis and IIF on SSS are negative.27
data have suggested that LVPC to be a morphological
variant of BP. However, vulval pemphigoid can be
BP confined to vulva and CP. The age onset of these
An autoimmune blistering disorder that may
variants ranges between 6 and 13 years. All present
very rarely occur in childhood. Only a few cases have
with vulva discomfort and erosions with or without
been described in infant less than 4 months of age.
oral, perianal and eye involvement.34 Epitope targets
There is considerable clinical and histologic overlap
of the Abs from these patients have not been defined
with other acquired or congenital blistering disorders.
in detail. Circulating IgG Abs directs against BP180,
A definite diagnosis of childhood BP requires DIF
its 120-kDa soluble ectodomain and against the C-
and, in some cases, characterization of the target
terminus of BP180. No reactivity is detected towards
antigen. Although the cause of childhood BP is
the NC16a BP180. Linear IgG and C3 deposits are
unknown, drug intake and vaccination; hepatitis B
found along the cutaneous BMZ. On SSS, IgG Abs
vaccine, tetanus toxoid, antiinfluenza vaccine as well
are shown to bind to the epidermis. LVPC is a variant
as hepatitis B surface antigen have been incriminated
of BP in which DIF combined with IB can deliver
in some cases.28-30 Besides, there is evidence that
valuable diagnostic information for differential diag-
childhood BP associated with chronic renal allograft
nosis. However, differentiation between the scarring
rejection31 and a solid organ transplantation.32 There
and non-scarring course of the disease cannot be made
are criteria for diagnosis childhood BP as follows33
with the present diagnostic markers and therefore
(1) patients 18 years or younger with the clinical
careful follow-up of patients with LVPC is required.35
appearance of tense bullae on erythematous or non-
In general, clinical, histological and immunopathological
erythematous skin with or without mucous membrane
findings in childhood BP appear to be not different
involvement, and histopathologic study showing sub-
form the adult. Nevertheless, mucosal and palm &
epidermal bulla formation with eosinophils. (2) DIF
sole lesions seem to occur more frequently in child-
showing the linear deposition of IgG and/or C3 at
hood BP.36 Childhood BP has to be differential
the BMZ and/or positive IIF showing IgG antibodies
diagnosed with chronic bullous dermatosis of child-
reactive with antigens at the BMZ. Two subtypes
hood (CBDC). The differrence of both diseases are
of childhood BP have been described. First, infantile
BP mostly presents at the first year of life. Blisters
usually are on palms and soles. Second, self-limited
localized form presents with non-scarring BP-liked on
vulva (localized vulval pemphigoid of childhood-
terized by the presence of IgG Abs to the dermal side
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Table 1 Difference of childhood bullous pemphigoid (BP) and Chronic bullous disease of Childhood (CBDC)37,38
Centripedal, perioral, pelvic region spare palms &
more peripheral esp. on palms & soles
of SSS together with the reactivity of these Abs to
serum contains Abs direct against a 105-kDa dermal
a novel 200-kDa antigen on IB of a dermal extract.
Ag and BP230 Ag. This unique bullous dermatosis
Up to now, there are a few cases of p-200 BP reported.
resembled severe toxic epidermal necrolysis clinically.
Patients present with a bullous eruption on the whole
The histologic findings resemble dermatitis herpeti-
body, which clinically resembles BP, DH, LAD, or
formis. DIF detected linear IgG and C3 deposition at
EBA. Some cases have severe mucous membrane
the cutaneous BMZ of lesional and perilesional skin.
involvement.39 A number of patients often associates
Direct and indirect IEM localized the IgG deposits
with psoriasis.40-42 A histopathological examination of
to the lowest portion of the LL. The patientûs auto-
a lesional skin biopsy specimen shows an area of DEJ
antibodies, belonging to the IgG1 subclass, labeled
separation and mixed dermal inflammatory infiltrates
BMZ of normal intact human skin, oral mucosa, and
consisting of lymphocytes, PMNs, and Eo. DIF shows
conjunctiva, and localized to the dermal side of SSS
a linear deposition of IgG and C3 at the BMZ. The
normal adult and neonatal human skin, but failed to
antibodies are mainly of the IgG4 subclass.39 On IEM,
react with human fetal skin up to 142 gestational days.
these Abs deposit at the LL-LD40,43 interface. The
The patientûs Abs fail to react with BP Ags or EBA
patient shows good response to the treatment with
Ag (type VII collagen) by immunoblotting. Instead,
systemic corticosteroids and dapsone.
the patientûs Abs unequivocally labels a 105 protein
in cellular extracts and conditioned media of human
cultured keratinocytes and dermal fibroblasts. The
Several cases have been reported of patients
titer of the patientûs antibody against the cutaneous
with immune mediated subepidermal blistering dis-
BMZ and the intensity of the antibody reactivity
orders whose Abs react to antigens present on both
against the 105-kD protein paralleled the patientûs
the dermal and epidermal side of SSS. The patientûs
disease activity. This patientûs disease represents a
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novel Ag and this patientûs disease represents a deep
LL pemphigoid, distinguishable from all other known
Nowadays, there are neither estimate optimum
treatment nor gold standard treatment of BP. There
are two different ideas of treatment. The first, the
smallest dose of systemic therapy to control the
disease is given. The second, high dose systemic
CBDC, dermatitis herpetiformis, BP and IgA BP. IgA
therapy is initially introduced and then tapered off
BP is distinguished from cases of dermatitis herpeti-
once control the disease. The aim of treatment is
formis by the clinical features and the site of IgA
to suppress the clinical signs and symptoms of BP
deposition on IEM. It is distinguished from cases of
without over-treating the patient, because BP tends
BP with linear IgA by the absence of circulating IgG
to spontaneously remit in most patients within ap-
anti-BMZ antibody, the therapeutic response to dap-
proximately 5 years. Principle of treatment in BP
sone and the frequent occurrence of circulating IgA
anti-BMZ antibody. The dual antibody response-
1. The most effective drugs or intervention with
there are both IgG and IgA autoantibodies to BMZ
target antigens found in some cases of childhood
2. Combination therapy offers any advantages
blistering. Although the reason why these children
have mixed immunologic response is not known. The
3. Both antimicrobials, such as tetracyclines,
presence of IgA is associated with a good response
minocycline, erythromycin, dapsone, or sulfonamides
to treatment with antimicrobials (dapsone, sulphonamide,
and its combination such as tetracycline and niacina-
erythromycin) and the clinical course is no more
protracted than found in children with a single anti-
The aims of treatment can be concluded as
1. To suppress the inflammatory process (corti-
costeroids-both topical and systemic, systemic antibiotics,
Occasionally, BP can present as localized
anti-inflammatory drugs). Topical steroid is good for
typical BP lesion. A few unusual features of BP have
LPP in a child treated.53 An anti-p200 pemphigoid
been described i.e. the blister limited to psoriatic
shows good response to the treatment with systemic
plaque, presented with psoriasis on vitiligo lesion or
as an extensive erosive BP, or a combination of BP
2. To suppress pathogenic antibody (high dose
and erythema multiforme. The lesion localizes at
corticosteroid, azathioprine, MTX, cyclophosphamide,
mycophenolate mofetil, combined antiCD-20/antiCD
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Table 2 Difference between bullous pemphigoid (BP) and pemphigoid gestationis (PG)
Pregnancy, hornonal therapy, trophoblastic CA,
Associated with HLA B8, DR3, DR4, C4 null alleles
25, leflunomide, mitomycin C for ocular CP). Topical
make the disease be tolerable to patients is an aim
tacrolimus was tried successfully in a resistant case
of treatment. Drugs can be reduced if disease activity
is suppressed, although it is not complete suppression.
3. Remove pathogenic antibody and inflamma-
It is not necessory to adjust dose if occasional and
tory mediators (plasmapheresis and double-filtration
4. Immune-modulating†treatment†(intravenous
The similarities and difference of PG and BP
have been summarized here. (Table 2.)64-66
The patients are classified mainly on severity
into 3 groups. Localized or mild cases can be treated
1. All PG and more than 50% BP sera contain
with potent topical corticosteroid e.g. clobetasol pro-
IgG autoantibodies that avidly bind complement in
pionate or low doses of systemic corticosteroid (20
mg or 0.3 mg/kg/d). Mild to moderate cases can be
2. Both show histopathologically subepidermal
treated with higher doses of systemic corticosteroid
bullae with eosinophil infiltration.
(40 mg or 0.6 mg/kg/d). Some patients have a good
3. Immunofluorescence (IIF) and immunoelec-
response to tetracycline plus nicotinamide. For severe
tron microscopy (IEM) reveal C3 and IgG in LL of
cases, high doses systemic corticosteroid (50-70 mg
or 0.75 mg/kg/d) or immunosuppressive drugs should
4. Both have a common epitope on extracellular
be used. To suppress clinical signs sufficiently to
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rtodime has also reported with contradictory results.67
Treatment is essentially based on cortico-
New treatment modalities in PG68-71 such as cyclo-
steroid; local for pauci-bullous and/or limited forms
sporine, intravenous immunoglobulin and tetracycline,
and systemic corticosteroid therapy for the severe
doxycycline combined with nicotinamide, pulse-dose
forms. So far, systemic corticosteroids have been the
intravenous cyclophosphamide, chemical oophorec-
main PG therapy and the use of cyclophosphamide,
tormy with goserelin in post partum have shown
dapsone, pyridoxine, methotrexate, plasmapheresis or
promise and warrant further evaluation.
BMZ = basement membrane zone, BP = bullous pemphigoid, BPP = Brunsting-Perry pemphigoid, CBDC = chronic bullous
disease of childhood, CP = cicatricial pemphigoid, DEJ = dermoepidermal junciton, DH = dermatitis herpetiformis,
DIF = direct immunofluorescence, EBA = epidermolysis bullosa acquisita, Eo = eosinophils, IB = immunoblotting assay,
IEM = indirect immunoelectron microscopy, LAD = linear IgA bullous dermatosis, LVPC = localized vulval pemphigoid of
childhood, MMP = mucous membrane pemphigoid, PMNs = polymorphonuclear cells, SSS = salt split skin.
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Business 2000 • Phase 1 Clinical Trials The Elan Story Here the drug is tested on human volunteers to confirm that theMedicinal drugs can be delivered in a number of different ways. Theydrug is safe to give to people. These trials can last for a year orElan Corporation plc is a phenomenal Irish success story. Today it ismay, for example, be delivered orally, injected into