Acceleration of cartilage and bone differentiation on collagenous substrata.

G. Maor, K. von der Mark, A Hari Reddi, D. Heinegård, A. Franzen, M. Silbermann

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Chondroprogenitor cells of newborn murine mandibular condyles were cultured on top of collagen sponges for up to 18 days. After 24 h in culture, new chondroblasts developed which subsequently matured showing signs of hypertrophy, while the extracellular matrix revealed positive reactivity for type II collagen, cartilage proteoglycans and mineralization. Light and electron microscopy examinations showed signs of new osteoid formation, a feature that was preceded by positive immunohistochemical reaction for type I collagen, fibronectin and bone specific sialoprotein. A close temporal and spatial association was noted between the development of mature, mineralized cartilage and new osteoid. The differentiation of new cartilage and bone cells was linked to an increased activity of DNA synthesis and cellular proliferation. The de novo bone formation was accompanied by increasing rates of alkaline phosphatase activity and uptake of [45Ca] features that were found to be tightly correlated to each other. The collagen substrata appeared also to facilitate the migration of cells, their replication and their subsequent differentiation to their respective cellular lineage. Hence, collagen sponges in vitro appear to serve as a promising substrata for culture systems involved with the growth and differentiation of mineralizing tissues such as cartilage and bone.

Original languageEnglish (US)
Pages (from-to)351-370
Number of pages20
JournalCollagen and Related Research
Volume7
Issue number5
StatePublished - Oct 1987
Externally publishedYes

ASJC Scopus subject areas

  • Rheumatology

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