Bone progenitor cell deficits and the age-associated decline in bone repair capacity.

Abstract:

:Aging bone shows a progressive decline in mass and strength. Previous studies have suggested that bone marrow stem cells are reduced with aging and that this could be responsible, in part, for age-associated bone deficits. We measured the number of osteoprogenitor cells present in the bone marrow from adult and aged rats as well as their ability to differentiate in vitro and to form bone in vivo. We found that the number of adherent colony-forming cells was significantly lower (65%) in marrow cells isolated from aged compared with adult rats. Furthermore, 88% of the colonies obtained from aged rats were alkaline phosphatase (AP) positive, whereas virtually all the colonies from adult rats were positive. The addition of dexamethasone to the culture medium decreased the proliferation of the adherent cells and reduced the number of colonies obtained from both adult and aged bone marrow, all of which were AP positive. No significant differences were found in the expression of certain major bone cell marker genes as a function of donor age. However, dexamethasone treatment increased expression of osteopontin (OP) by fivefold. Adult stromal cells not treated with dexamethasone and implanted subcutaneously in recipient rats exhibited about 10-fold greater formation of bone compared with cells from aged rats. In contrast, dexamethasone-treated cells exhibited high levels of bone formation, irregardless of donor age or the age of the recipient into which the cells were grafted. These studies are consistent with a deficit of osteoprogenitor cells in the bone marrow site as a contributing, perhaps correctable factor in the decline in bone repair and bone mass with age.

journal_name

Calcif Tissue Int

authors

Quarto R,Thomas D,Liang CT

doi

10.1007/BF00296343

subject

Has Abstract

pub_date

1995-02-01 00:00:00

pages

123-9

issue

2

eissn

0171-967X

issn

1432-0827

journal_volume

56

pub_type

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