Proteochondroitin sulfate synthesized in cartilages induced in vivo and in vitro by bone matrix gelatin

  • Oohira A
  • Nogami H
  • Kuboki Y
 et al. 
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Implanted allogeneic demineralized bone matrix gelatin induced sequential development of cartilage and bone in the recipient rat muscle tissue. Proteoglycans of the implants labeled in vivo with [35S]sulfate at different stages of development were analyzed by sucrose density gradient centrifugation. The major proteoglycan synthesized in day-5 implant, just prior to onset of chondrogenesis, was a dermatan sulfate-containing proteoglycan with relatively slow sedimentation rate. Additionally, a small amount of a faster sedimenting component could be detected. The faster sedimenting proteoglycan, in which chondroitin 4-sulfate accounted for 85% of total radioactivity, became predominant in day-10 sample when cartilage formation was maximal. By day 30, when cartilage had been replaced by newly formed bone, the synthesis of this faster sedimenting component had ceased. A similar, if not identical, proteoglycan was found to be a major one synthesized by the in vitro-induced cartilage. This proteoglycan was smaller in overall size and shorter in length of its chondroitin sulfate chains than a major proteoglycan component obtained from neonatal rat epiphyseal cartilage. Concurrent with these changes in proteoglycan type, there appeared to be a change in collagen type, since type II collagen, in addition to type I collagen, was synthesized in day-10 implant. These results indicate that the proteoglycan can be used as a molecular marker for chondrogenesis by bone matrix gelatin. © 1979.

Author-supplied keywords

  • (Cartilage)
  • Bone matrix gelatin
  • Chondrogenesis
  • Collagen synthesis
  • Development
  • Proteochondroitin sulfate
  • Proteoglycan

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  • Atsuhiko Oohira

  • Hiroshi Nogami

  • Yoshinori Kuboki

  • Satoshi Sasaki

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