Low doses and high doses of heparin have different effects on osteoblast-like Saos-2 cells in vitro.

Abstract:

:Long-term treatment with heparin has been associated with an increased risk of osteoporosis. Given the importance of heparan sulfate proteoglycans for bone metabolism, it can be anticipated that heparin due to its structural similarity with heparan sulfate chains somehow interferes with the biological activities of these cell surface- and extracellular matrix-associated molecules. Initially in order to study the effect(s) of heparin on osteoblasts that possibly contribute to the development of heparin-induced osteoporosis, we treated osteoblast-like Saos-2 cells in monolayer culture for different periods of time with different concentrations of heparin. None of the heparin concentrations tested led to an inhibition of osteoblast proliferation during the early proliferative phase. After longer incubation times, however, cultures treated with higher concentrations of heparin (>/=5 microg/ml) exhibited a reduction in cell number as well as an inhibition of matrix deposition and mineralization. These effects could not be observed with lower heparin concentrations. On the contrary, low concentrations of heparin (5-500 ng/ml) even promoted matrix deposition and its subsequent mineralization. Apparently, heparin has a biphasic effect on osteoblast-like Saos-2 cells, being inhibitory at high concentrations but stimulatory at low concentrations. These results imply that heparin at concentrations well below those used for antithrombotic therapy might eventually turn out to be beneficial for bone formation.

journal_name

J Cell Biochem

authors

Hausser HJ,Brenner RE

doi

10.1002/jcb.20007

subject

Has Abstract

pub_date

2004-04-01 00:00:00

pages

1062-73

issue

5

eissn

0730-2312

issn

1097-4644

journal_volume

91

pub_type

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