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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 289 (1997), S. 194-203 
    ISSN: 1432-069X
    Keywords: Key words HMC-1 cell line ; Extracellular matrix ; protein ; Integrin ; c-kit ; Cadherin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Skin mast cells are typically located in the perivascular or perineural connective tissue. We observed that HMC-1 mast cells growing in suspension adhered efficiently to (〉 90% of cells) and spread on top of fibroblast monolayers and to a lesser degree on purified extracellular matrix proteins. Since adhesive interactions determine cell migration and tissue localization we studied the mechanism. It was found that HMC-1 cells attach to collagen I and fibronectin, laminin, collagen IV and vitronectin, but not to collagens III and VI or hyaluronic acid. Adhesion to fibronectin, collagen I and laminin was completely inhibited by mAbs blocking β 1 -integrins, whereas adhesion of HMC-1 cells to vitronectin was inhibited by anti-α v -chain mAbs. However, attachment of HMC-1 cells to fibroblasts was not influenced by mAbs blocking β 1 - or α v -chain function, by RGD peptides or by mAbs interfering with other receptors, most notably c- kit . Identical results were obtained with normal mast cells isolated from human foreskin. These results indicate that human mast cells attach to fibroblasts independently of β 1 - or α v -integrins as well as of c- kit receptor-mediated mechanisms. The functional characteristics observed (i.e. only partial sensitivity to trypsin and EDTA, no increase in trypsin sensitivity by pretreatment with EDTA) suggest that cadherin receptors were not involved, and it is likely that the adhesion process observed involved not-yet-defined heterotypic cell-cell adhesion receptors.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1173
    Keywords: Schlüsselwörter Streifen- und wirbelförmige nävoide Hypermelanose ; Lineare pigmentierte Dermatosen ; Blaschko-Linien ; Mosaik ; Key words Linear and whorled nevoid hypermelanosis ; Linear pigmented dermatoses ; Lines of Blaschko ; Mosaicism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A 7 year old boy presented with linear and whorled nevoid hypermelanosis (LWNH). This entity, delineated in 1988, is characterized by streaked or whorled, frequently reticulate hyperpigmented lesions following the lines of Blaschko without preceding inflammation and without atrophy. The age of onset is usually within the first 2 years of life. Histologically, there is a mild basal cell hyperpigmentation with prominent melanocytes. In contrast to earlier reports, we observed some melanophages in the upper dermis. Associated abnormalities have been reported in a few patients, but were absent in our case. We present the clinical features, diagnostic criteria and differential diagnosis of this rare entity. Apparently, our patient represents the first case of LWNH in the German literature.
    Notes: Zusammenfassung Wir diagnostizierten bei einem 7jährigen Patienten eine streifen- und wirbelförmige nävoide Hypermelanose (SWNH). Die wesentlichen Kriterien dieser 1988 beschriebenen Entität sind lineare, oft retikuläre Hyperpigmentierungen entlang der Blaschko-Linien ohne entzündliches Vorstadium und ohne Atrophie der Läsionen. Die Erkrankung manifestiert sich meist innerhalb der ersten 2 Lebensjahre. Histologisch ist eine verstärkte Pigmentierung des Stratum basale mit prominenten Melanozyten zu finden. Im Gegensatz zu früheren Beobachtungen fanden sich bei unserem Patienten einige Melanophagen im oberen Korium im Sinne einer Pigmentinkontinenz. In wenigen Fällen wurden assoziierte Mißbildungen mitgeteilt, fanden sich im vorgestellten Fall jedoch nicht. Anhand dieses Fallberichtes möchten wir das klinische Bild, die diagnostischen Kriterien und die Differentialdiagnosen dieser seltenen Entität darstellen. Soweit uns bekannt, stellt unser Patient den ersten Fall einer SWNH in der deutschsprachigen Literatur dar.
    Type of Medium: Electronic Resource
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