Strontium can increase some osteoblasts without increasing hematopoietic stem cells

Lymperi, Stefania, Horwood, Nicole, Marley, Stephen, Gordon, Myrtle Y, Cope, Andrew P and Dazzi, Francesco (2008) Strontium can increase some osteoblasts without increasing hematopoietic stem cells. Blood, 111 (3). pp. 1173-1181. ISSN 0006-4971

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Abstract

Osteoblasts are a key component in the regulation of the hematopoietic stem cell (HSC) niche. Manipulating osteoblast numbers results in a parallel change in HSC numbers. We tested the activity of strontium (Sr), a bone anabolic agent that enhances osteoblast function and inhibits osteoclast activity, on hematopoiesis. In vitro treatment of primary murine osteoblasts with Sr increased their ability to form bone nodules, and in vivo it increased osteoblast number, bone volume, and trabecular thickness and decreased trabecular pattern factor. However, the administration of Sr had no influence on primitive HSCs, although the number of hematopoietic progenitors was higher than in control cells. When Sr-treated mice were used as donors for HSC transplantation, no difference in the engraftment ability was observed, whereas hematopoietic recovery was delayed when they were used as recipients. Despite the changes in osteoblast numbers, no increment in the number of N-cadherin(+) osteoblasts and N-cadherin transcripts could be detected in Sr-treated mice. Therefore, increasing the overall number and function of osteoblasts without increasing N-cadherin(+) cells is not sufficient to enhance HSC quantity and function. Our study further supports the notion that N-cadherin(+) osteoblasts are fundamental in the hematopoietic niche.

Item Type: Article
Uncontrolled Keywords: animals,drug effects,drug effects,drug effects,cells, cultured,hematopoietic stem cell transplantation,cytology,mice,mice, inbred balb c,cytology,drug effects,pharmacology,pharmacology
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
Depositing User: LivePure Connector
Date Deposited: 06 Mar 2019 11:30
Last Modified: 25 Jul 2019 02:11
URI: https://ueaeprints.uea.ac.uk/id/eprint/70145
DOI: 10.1182/blood-2007-03-082800

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