The Journal of Bone and Joint Surgery, Vol 77, Issue 4 543-554, Copyright © 1995 by Journal of Bone and Joint Surgery, Inc
Regulation of proliferation and osteochondrogenic differentiation of periosteum-derived cells by transforming growth factor-beta and basic fibroblast growth factor
M Iwasaki, H Nakahara, K Nakata, T Nakase, T Kimura and K Ono
Department of Orthopaedic Surgery, Osaka University Medical School, Japan.
We studied the effects of transforming growth factor-beta and basic
fibroblast growth factor on the regulation of proliferation and
osteochondrogenic differentiation of periosteum-derived cells, which have
the potential to differentiate into bone and hypertrophic cartilage in
vitro. Histological observation revealed that transforming growth
factor-beta stimulated chondrogenesis of periosteum-derived cells while
basic fibroblast growth factor stimulated proliferation of fibroblast-like
cells and inhibited osteochondrogenic differentiation. Immunohistochemical
studies revealed that basic fibroblast growth factor inhibited the
expression of osteocalcin. Transforming growth factor-beta enhanced uronic
acid content but decreased DNA content, alkaline phosphatase activity, and
calcium content. In contrast, basic fibroblast growth factor enhanced DNA
content but decreased alkaline phosphatase activity, calcium content, and
uronic acid content. In addition, transforming growth factor-beta shortened
the time-course of gene expression of type-X collagen whereas basic
fibroblast growth factor inhibited the gene expression. These results
indicate that transforming growth factor-beta stimulates osteochondrogenic
differentiation of periosteum-derived cells but inhibits proliferation.
They also indicate that basic fibroblast growth factor stimulates
proliferation of periosteum-derived cells but inhibits osteochondrogenic
differentiation.