Abstract
Injection into chick embryos incubated for nine days, of β-aminopropionitrile (BAPN) at doses above 0.312 mg/embryo prevented the formation of the cartilage normally present on the membrane bones from the eleventh day of incubation onwards. The histogenesis of this inhibition is described. BAPN increased the proportion of soluble collagen without altering total collagen synthesis and decreased the synthesis of hexosamine-containing acid mucopolysaccharides within the membrane bones. The relationship between cross-linking of collagen, collagen solubility, synthesis of acid mucopolysaccharides and mechanical stimulation (the extrinsic factor initiating chondrogenesis in this system) in the formation of cartilage from bipotential germinal cells on the membrane bones is discussed.
Résumé
L'injection d'embryons de poulet, incubés pendant neuf jours, avec du β-aminopropionitrile (BAPN), à des doses supérieures à 0,312 mg par embryon, empêche la formation de cartilage, normalement présent au niveau des os de membrane à partir du llème jour de l'inculation. L'hitsogenese de cette inhibition est décrite. BAPN augmente la propertion de collagène et diminue la synthèse des mucopolysaccharides acides, contenant de l'hesoxamine, au niveau des os de membrane. Le rapport entre les chainons tranversaux du collagène, sa solubilité, la synthèse des mucopolysaccharides acides et la stimulation mécanique (le facteur extrinsèque déclenchant la chondrogenèse dans le système) est discuté sous l'angle de la formation cartilagineuse sur les os de membrane, à partir de cellules souches.
Zusammenfassung
Wird β-Aminopropionitrol (BAPN) in Dosen von über 0,312 mg/Embryo in 9 Tage inkubierte Hühnerembryonen injiziert, so wird die Bildung des normalerweise vom 11. Inkubationstag an auf dem Deckknochen vorliegenden Knorpels verhindert. Die Histogenese dieser Hemmung wird beschrieben. BAPN erhöhte den Anteil des löslichen Kollagens, ohne die Synthese des Totalkollagens zu verändern; es verminderte die Synthese der hexosaminhaltigen sauren Mucopolysaccharide innerhalb der Deckknochen. Die Diskussion betrifft die Beziehung zwischen der Quervernetzung des Kollagens, der Kollagenlöslichkeit, der Synthese von sauren Mucopolysacchariden und der mechanischen Stimulation (wobei der Extrinsicfaktor die Chondrogenese in diesem System auslöst) bei der Knorpelbildung aus den bipotentialen Keimzellen der Deckknochen.
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Hall, B.K. Differentiation of cartilage and bone from common germinal cells. Calc. Tis Res. 8, 276–286 (1971). https://doi.org/10.1007/BF02010147
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DOI: https://doi.org/10.1007/BF02010147