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  • 1
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Basement membrane components and collagen biosynthesis were studied in suction blisters in human skin. The basement membrane components were characterized by immunofluorescence using specific antibodies to type IV collagen, laminin and fibronectin, and collagen biosynthesis was studied by assaying galactosylhydroxylysyl glucosyltransferase.In suction blisters, the separation of epidermis and dermis occurred above the lamina lucida, indicating that the basement membrane, composed of lamina lucida and lamina dcnsa, forms a mechanically strong entity. During the regeneration phase of blisters, type IV collagen and laminin were not observed in the old epidermal blister roof. This indicates that keratinocytes when separated from the underlying basement membrane or connective tissue do not synthesize laminin or type IV collagen.GalactosylhydroxylysyJ glucosyltransferase activity could be demonstrated in blister fluid and was about the same as in serum when expressed on the basis of protein in fresh blisters. It increased by 2–3 fold during the repair of blisters, indicating that there was local production of this enzyme. Further studies revealed that pure epidermis contained galactosylhydroxylysyl glucosyltransferase and hydroxyproline and this suggests that epidermis may synthesize some collagen type which, according to these studies, is not type IV (basement membrane) collagen.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 269 (1980), S. 99-104 
    ISSN: 1432-069X
    Keywords: Local photochemotherapy ; Collagen metabolism ; Trioxsalen ; Lokale Photochemotherapie ; Kollagenmetabolismus ; Trioxsalen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Wirkung der Photochemotherapie auf den Kollagenmetabolismus der Haut wurde an Psoriasis-Patienten (n=57) untersucht. Achtundzwanzig Patienten wurden mit Trioxsalen-Bädern und UVA-Irradiation, neun mit Ditranol und UVB-Irradiation behandelt. Zwanzig Probanden dienten als Kontrollgruppe. Es wurden keine Unterschiede zwischen den Behandelten und der Kontrollgruppe festgestellt (Hydroxyprolinkonzentration im Urin, Hydroxyprolinkonzentration in der Haut und Prolinhydroxylase sowie Galactosyl-Hydroxylysyl-Glucosyltransferaseaktivität). Dieselben Parameter wurden bei der Anwendung mit kumulativen Dosen von UVA-Irradiationen verglichen. Dabei nahm die Aktivität der Prolinhydroxylase der Haut je nach der Größe der UVA-Dosen ab, hingegen waren keine Änderungen des Hydroxyprolingehaltes der Haut oder der Galactosyl-Hydroxylysyl-Glucosyltransferase nachzuweisen. Langfristige lokale PUVA-Therapie beeinflußt somit nicht den Kollagenmetabolismus der Haut.
    Notes: Summary The effect of photochemotherapy on skin collagen metabolism was investigated in 57 patients with psoriasis. Twenty-eight patients were treated with trioxsalen baths and UVA irradiation, nine with ditranol and UVB irradiation, and 20 untreated psoriasis patients served as controls. No significant changes were found between the treated groups and the control group in urinary hydroxyproline excretion, skin hydroxyproline content, or in the activities of two enzymes catalyzing collagen biosynthesis, prolyl hydroxylase, and galactosylhydroxylysyl glucosyltransferase in the skin. When the same parameters were compared with the cumulative doses of UVA irradiation, skin prolyl hydroxylase activity slightly decreased with increasing UVA doses, whereas no changes were found in skin hydroxyproline content or galactosylhydroxylysyl glucosyltransferase activity. It was concluded that long-term local PUVA therapy does not significantly alter collagen metabolism in the skin.
    Type of Medium: Electronic Resource
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