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  • 1
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Patients with anti-epiligrin cicatricial pemphigoid have anti-basement membrane autoantibodies that immunoprecipitate a set of disulfide-linked human keratinocyte polypeptides that co-migrate in sodium dodecyl sulfate polyacrylamide gel electrophoresis with the same complex identified by monoclonal anti-epiligrin (P1E1) and monoclonal anti-nicein/kalinin (GB3) antibodies. In an attempt to further compare the reactivity of patient autoantibodies, P1E1 and GB3, these reagents were tested against the tumor nest basement membranes of 7 papulonodular basal cell carcinomas. These studies found that all of these reagents showed markedly decreased or no reactivity against this substrate. Though their concordant lack of reactivity failed to distinguish these antibodies, these studies did identify a significant defect in papulonodular basal cell carcinoma tumor nest basement membranes. Similarly, integrin subunits α6, β4, α3. and α2 as well as bullous pemphigoid antigens 1 and 2 (all potential receptors for the extracellular matrix ligands epiligrin and nicein/kalinin) were also reduced in these tumor nest basement membranes. These findings signify an extensive impairment in the lamina lucida of this neoplasm's basement membrane. Related comparative studies of normal human keratinocytes and transformed human epithelial cell lines (specifically, A-431 and HaCat cells) showed that epiligrin production is markedly decreased in the latter. Decreased expression of epiligrin and nicein/ kalinin in papulonodular basal cell carcinoma tumor nest basement membranes in vivo and transformed epithelial cells in vitro indicate that this complex is a transformation-sensitive cell adhesion ligand.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Generalized atrophic benign epidermolysis bullosa (GABEB) is a nonlethal form of junctional epidermolysis bullosa characterized by generalized skin and mucosal blisters that heal with atrophy; other features include alopecia, nail dystrophy, large melanocytic nevi, and autosomal recessive inheritance. The specific aim of this study was to identify an abnormality in epidermal basement membrane adhesion molecules in well characterized GABEB patients that would explain why these subjects' epidermis separates from their epidermal basement membrane. Cryostat sections of nonlesional skin from 8 GABEB patients in 5 different families as well as skin from normal volunteers (controls) were studied by indirect iminunofluorescence microscopy using rabbit antiserum directed against a BPAG1 fusion protein or monoclonal antibodies directed against the extracellular domain of BPAG2 (HD18 and 233), epiligrin (P1E1), laminin 5 (GB3), types IV and VII collagen, or integrin subunits α2, α3, β, α6, or β4. In these studies, monoclonal antibodies HD18 and 233 showed no reactivity and diminished reactivity, respectively, to the epidermal BM of all GABEB patients. Interestingly, in one patient, the absent or diminished reactivities of monoclonal anti-BPAG2 antibodies were limited to well demarcated portions of an otherwise intact epidermal basement membrane. Moreover, BPAG1, epiligrin, laminin 5, types IV and VII collagen, and all integrin subunits under study were expressed in the same manner in both GABEB and normal human skin. These findings identify an abnormality in the extracellular domain of BPAG2 in the skin of GABEB patients. BPAG2 (type XVII collagen) is a transmembrane, hemidesmo-some-associated molecule whose extracellular domain resides at the exact level where blisters develop in the skin of patients with GABEB. Impairment of this adhesion molecule may play a key role in the pathogenesis of this inherited subepidermal bullous disease.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Transmissibility of characteristic lesions to experimental animals may help us understand the pathomechanism of human autoimmune disease. Here we show that human autoimmune disease can be reproduced using genetically engineered model mice. Bullous pemphigoid (BP) is the most common serious ...
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1173
    Keywords: Schlüsselwörter Vernarbendes Pemphigoid ; Epiligrin-Autoantikörper ; Immunsuppressive Therapie ; Paraneoplasie ; Key words Cicatricial pemphigoid ; Anti-epiligrin autoantibodies ; Immunosuppressive therapy ; Paraneoplasia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A 71 year old female patient presented with erosions of the oral, genital and ocular mucosa, but without skin lesions. One year prior to the onset of lesions, a metastatic adenocarcinoma of the endometrium had been diagnosed. In perilesional skin, direct immunofluorescence showed linear deposits of C3 and IgG along the basement membrane zone. Indirect immunofluorescence demonstrated anti-basement membrane zone antibodies which bound exclusively to the dermal side of 1M NaCl-split skin. In immunoprecipitation studies, the autoantibodies bound a set of proteins characteristic of epiligrin/laminin-5, and they specifically immunoblotted the alpha-subunit of this protein. These results confirmed our presumed diagnosis of anti-epiligrin cicatricial pemphigoid. Combined treatment with methylprednisolone and dapsone resulted in prompt remission, despite progression of her malignancy. So far, only eight patients with anti-epiligrin cicatricial pemphigoid have been reported worldwide. Our patient represents the first case from Austria and is clinically and immunopathologically similar to previously reported cases.
    Notes: Zusammenfassung Berichtet wird über eine 71jährige Patientin mit erosiver Stomatitis, Vulvitis und Konjunktivitis, jedoch ohne Hautbeteiligung, bei der ein Jahr vor dem Auftreten der Schleimhautläsionen ein metastasierendes Adenokarzinom des Endometriums diagnostiziert worden war. Die Histologie zeigte eine junktionale Spaltbildung, die direkte Immunfluoreszenz periläsionaler Haut lineare Ablagerungen von C3 und IgG entlang der BMZ. Mit Hilfe der indirekten Immunfluoreszenz ließen sich niedrigtitrige anti-BMZ-Antikörper nachweisen, die in der Spalthautanalyse am Boden der artifiziellen Blase banden. Die Autoantikörper der Patientin präzipitierten ein Spektrum an Proteinen, das für Epiligrin/Laminin-5 typisch ist, und banden im Immunoblot spezifisch die alpha-Kette des Heteropeptids. Aufgrund dieser Ergebnisse stellten wir die Diagnose eines vernarbenden Pemphigoids vom anti-Epiligrin-Typ. Unter Behandlung mit Methylprednisolon und Dapson konnte eine rasche Remission erzielt werden, trotz Progression des metastasierenden Adenokarzinoms. Bisher wurden weltweit nur 8 Patienten mit vernarbendem Pemphigoid vom anti-Epiligrin-Typ beschrieben; unsere Patientin stellt den ersten in Österreich diagnostizierten Fall dar und gleicht sowohl klinisch als auch immunpathologisch den bisher beschriebenen Fällen.
    Type of Medium: Electronic Resource
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