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• Some had oral lesions for > 5 years before generalization
• Intact blister are rare� because fragile &
break easily
Scattered� often extensive erosions (oral
cavity, buccal mocosa� pharynx, other
area)
Histopathology PVHistopathology PV
• Suprabasilar blister with acantholysis�
just above basal cell layer epidermal cells lose their normal cell to cell contact� form blister� KC in the blister cavityblister� KC in the blister cavity
basal layer stay attached to the BMZ�may lose the contact with their neigbors� row of tombstones
Bulla : intra epidermal/ supra basal
Tzanck TestTzanck Test
• To show acantholytic Epidermal cells
ImmunofluorescenceImmunofluorescence
• The hallmark: IgG autoantibodies against the cell surface of keratinocytes
• Prednisone: high dose� disease activity is controlled� tapering pred.� low dose
• If combination immunosuppressive� dose intermediate/ low doseintermediate/ low dose
• Immunosuppressive:
mycophenolate mofetil (cellcept)
azathioprine (imuran)
cyclophoaphamide (cytoxan)
Bullous PemphigoidBullous Pemphigoid
• Usually occurs in elderly pat.
• Mortality 6%-40% in 1 year
• Pruritic urticarial lesions
• Tense large blisters• Tense large blisters
• Oral m. membrane erosions in minority of
pats
Direct Immunfluorescence C3 , IgG at epidermal basement membrane
Bullous pemphigoidBullous pemphigoid
ImmunofluorescenceImmunofluorescence
• Direct: C3 and IgG at epidermal basement membrane
• Indirect: antibasement membrane IgG in • Indirect: antibasement membrane IgG in serum
• Perilesional skin reveals immunoreactants deposited in linear pattern at epid basement membrane
AutoantigensAutoantigens
• Proteins in the Kc hemidesmosome a basal cell-basement membrane adhesion structurestructure
Etiology & pathogenesisEtiology & pathogenesis
• Electron microscopy: early blister formation occurs in the lamina lucida, between the basal cell membrane and the lamina densalamina densa
• Blister formation: there is loss anchoring filaments and hemidesmosome
degranulation of infiltrating leucocytes
ImmunofluorescenceImmunofluorescence
• Indirect IMF antibodies does not usually correlate with disease extent/ activity in contrast in pemphigus)
• C3 and other components classicals and • C3 and other components classicals and alternative complement pathways & complement regulatory protein B 1H� at BMZ
• Activated complement in blister fluid
Pemphigoid antigensPemphigoid antigens
• Immnunoelectron microscope: Ag in the hemidesmosome, an adhesion junction importants in anchoring the basal cell to BMZ
Clinical FindingsClinical Findings
• Bullous: large, tense, arising in normal
skin/ erythematous base
filled : clear fluid/ hemorrhagic
Eroded skin� tendency to reepithelize
The erosion do not tend to expand at the The erosion do not tend to expand at the
periphery
• Localisation: lower abdomen
inner / anterior thights
flexor forarms/ any where
The lesion� do not scar
Clinical FindingClinical Finding
• Usually : pruritus
• Sometimes: erythematous component�pat. with urticarial lesion
• Resolution : from the center, • Resolution : from the center, hyperpigmentation
Large bullae occure infrequentlyLarge bullae occure infrequently
Vesicles in palm: hemorrhagic
Disappearance : hyperpigmentation &
hypopigmentation
Herpetiform (herpes like): group of lesions
Clinical ManifestationClinical Manifestation
• Symptoms: severe stinging, burning,
itching
Symetric distribution:
elbows, knees, buttock, shoulders and elbows, knees, buttock, shoulders and sacral areas
Most pat: scalp lesions and/or nuchal posterior, face and facial hairline
M. Memb. : uncommon as in palms & sole
Laboratory TestLaboratory Test
• Perilesional and uninvolved skin pat DH: granular (or fibrillar) Ig deposits located in dermal papilary tips� igA
• IgA deposits are unaffected by treatment • IgA deposits are unaffected by treatment with drugs� may decrease in intensity or disappear after long term adherence to gluten free diet
Laboratory FindingLaboratory Finding
• IgA1 (produce in bone marrow) >
• IgA2 (produced in gut secretion)
• Complement (C3)� the same location as IgA
• C3� is not affected by treatment with dapson, • C3� is not affected by treatment with dapson,
may not detectable after teatment with gluten
free diet
• Immunoelectron Micrc: IgA associated with
bundles of microfibril, anchoring fibrils of the
papillary dermis below the basal lamina
Immunogenetic FindingsImmunogenetic Findings
• 77%-87% : HLA-B8
• Class II major histocompatibility complex : HLA-DR and DQ associated in DHHLA-DR and DQ associated in DH
HistopathologyHistopathology
• Early lesions (non vesicular)� dermal papillary collections of neutrophils (micro absces), neutrophilic fragments, eosinophil, fibrin� sometimes separation eosinophil, fibrin� sometimes separation of the papillary tips from the overlying epidermis
• Upper and middle dermal blood vessels are suurounded by lymphohistiocyte infiltrate
TreatmentTreatment
• Sulphones: diaminodiphenyl sulfone
(dapsone),
sulfoxone (diasone)
Dose: 100 mg-150 mg/day (once a day)Dose: 100 mg-150 mg/day (once a day)
occasional: 300-400 mg/day, 25 mg/week
Sulphapyridine: 1,0-1,5 gr daily
(in pat. intolerant of dapsone)
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Pemphigus VulgarisPemphigus Vulgaris
Pemphigus VulgarisPemphigus Vulgaris
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