Increased Turnover of Small Proteoglycans Synthesized by Human Osteoblasts During Cultivation with Ascorbate and β-Glycerophosphate.

Abstract:

:The small proteoglycan decorin had been localized previously at the d-band in the gap zone of collagen fibrils in nonmineralizing tissues. In bone matrix this zone is proteoglycan free and is at least in some species the place where mineralization along collagen fibrils starts. To study the metabolism of the small proteoglycans decorin and biglycan under mineralizing conditions, osteoblasts from human nasal bone were cultured for several weeks in the presence or absence of β-glycerophosphate and ascorbate. An immediate consequence of the treatment was a reduced expression of decorin, as judged by immune precipitation, whereas the biosynthesis of biglycan was not affected. Pulse-chase experiments were performed with osteoblasts embedded in floating type I collagen gels. In the presence of β-glycerophosphate and ascorbate, a more rapid turnover of both proteoglycans was noted; the one of biglycan reached statistical significance. Indirect evidence for an enhanced rate of proteoglycan endocytosis was obtained. This effect was not seen in cultured skin fibroblasts. Thus, osteoblasts respond rapidly to mineralizing conditions with alterations of small proteoglycan biosynthesis and turnover.

journal_name

Calcif Tissue Int

authors

Blumberg P,Brenner R,Budny S,Kresse H

doi

10.1007/s002239900279

subject

Has Abstract

pub_date

1997-06-01 00:00:00

pages

554-560

issue

6

eissn

0171-967X

issn

1432-0827

pii

10.1007/s002239900279

journal_volume

60

pub_type

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