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  • Anatomy  (1)
  • Cartilage cells  (1)
  • Springer  (2)
  • Berlin [u.a.] : Springer
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  • Springer  (2)
  • Berlin [u.a.] : Springer
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  • 1
    ISSN: 1432-0827
    Keywords: Corticosteroids ; Collagen synthesis ; Bone cells ; Cartilage cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Deflazacort is a new synthetic glucocorticoid which is an oxazoline derivative of prednisolone. In previous studies, it was shown that deflazacort, depending on the test model used, not only showed considerably more antiinflammatory potency than prednisolone in animals but also caused less deleterious effects on bone mineral metabolism than equivalent amounts of other glucocorticoids in man. In this study, we have compared the effects of deflazacort with those of dexamethasone on the synthesis of collagen in various rat bone cell populations and chondrocytes. Three bone cell populations were prepared by sequential time-dependent collagenase treatment of 1-day-old rat calvaria. Each cell population was further purified on a Percoll gradient (10–90%) yielding three populations of which two are different in alkaline and acid phosphatase and response to parathyroid hormone. A 3-day treatment of bone cell populations with deflazacort and dexamethasone (10−11-10−5 M) revealed that both glucocorticoids, although at different concentrations, inhibited collagen synthesis. 21-desacetyl-deflazacort (5β, 11β, 16β)- 11,21-dihydroxy-2′-methyl-5-H-pregna-1-enol[17,16-d]oxazole-3,20-dione), the presumably active form of the steroid, which is formedin vivo after administration, produced nearly identical results as its precursor. Glucocorticoid concentrations at which inhibition was initially observed were 10−9 M and 10−7 M for dexamethasone and deflazacort respectively. Inhibition of collagen synthesis was significantly impaired only in cells isolated from bone during early tissue digestion, and not in those obtained during extensive collagenase treatment. Chondrocytes isolated from articular cartilage of 3-month-old rabbits and grown in primary cultures did not respond to either steroid. However, when passed and grown in secondary culture, collagen synthesis was inhibited considerably more by dexamethasone than by deflazacort. It is apparent that both deflazacort and dexamethasone, although at different concentrations, inhibit collagen synthesis in a differential manner. The lesser deterrent effect of deflazacort may be of clinical importance.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 5 (1970), S. 56-63 
    ISSN: 1432-0827
    Keywords: Epiphysis ; Cartilage ; Morphology ; Fluorescein ; Anatomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Court term d'incubation des cultures d'un organe du cartilage scapulaire chez le jeune chien dans un milieu raffiné avec la lysozyme ou la protamine produit des histologiques changements spécifiques dans les proprietés de la coloration du l'explant qui n'est pas produit par l'albumine ou par la lysozyme inactivée par les rayons ultraviolets. Ces modifications sont différent avec chacune des protéines. L'effet de la lysozyme, est précisement distributé tandis que la protamine est diffusée. Si on use la flouresceine avec les protéins, les même changements histologiques se produisent dans le cartilage et la flourescence c'est repandue précisement au même endroit, où les propriétés colorant du tissue ont été changé. L'observation qui montre que la lysozyme dans des spécifiques points anatomiques suggère qu'elle réagit chimiquement avec les constituants spécifiques de la matrice cartilagineuse, probablement avec des macromolécules négativement chargées.
    Abstract: Zusammenfassung lysozym und Protamin angereicherte Gewebekulturen des wachsenden Hundeschulterblattes erzeugen nach kurzer Zeit spezifische Veränderungen in der histologischen Anfärbbarkeit des Explantats, die jedoch nicht durch Albumin oder durch Lysozym, das durch Ultraviolettbestrahlung inaktiviert wurde, induziert werden können. Die hervorgerufenen Veränderungen sind für beide Proteine verschieden. Der Lysozymeffekt ist anatomisch genau verteilt, während der Protamineffekt zerstreut erscheint. Fluoresceinkonjugate dieser Proteine erzeugen identische Veränderungen im Knorpel, wobei die Verteilung der Fluorescenz mit der der Veränderungen der histologischen Anfärbbarkeit übereinstimmt. Die Beobachtungen zeigen, daß durch die Zugabe von Lysozym zu Gewebekulturen dieses Protein an speziellen anatomischen Stellen angereichert wird. Es kann daraus geschlossen werden, daß Lysozym chemisch sich mit spezifischen Komponenten des Knorpels verbindet, wahrscheinlich den negativ geladenen Makromolekülen.
    Notes: Abstract Short-term incubation of organ cultures of puppy scapulae in a medium enriched with lysozyme or protamine induces specific alterations in the histologic staining properties of the explant not induced by albumin or by ultraviolet-inactivated lysozyme. The induced changes are different for each two proteins. The lysozyme effect is anatomically distributed precisely while that of protamine is diffuse. If fluorescein conjugates of the proteins are used, identical histologic changes are induced in the cartilage and the distribution of fluorescence is precisely that of the altered tinctorial properties of the tissue. The observation, which shows that lysozyme, when added to cartilage, accumulates in specific anatomic sites suggests that it chemically interacts with specific components of cartilage matrix, presumably with negatively charged macromolecules.
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