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Best5: A novel interferon-inducible gene expressed during bone formation

Lookup NU author(s): Dr Mark Birch


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Regulation of bone formation is important in the pathogenesis of many conditions such as osteoporosis, fracture healing, and loosening of orthopedic implants. We have recently identified a novel rat cDNA (best5) by differential display PCR that is regulated during osteoblast differentiation and bone formation in vitro and in vivo. Expression of best5 mRNA is induced in cultures of osteoblasts by both interferon-α (IFN-α) or IFN-γ. Whereas IFN-α induced a rapid, transient induction of best5 expression peaking at 4- 6 h poststimulation, IFN-γ elicited a more prolonged induction of best5 expression, which remained elevated 48 h poststimulation. A polyclonal antibody generated to a peptide derived from the best5 coding region recognized a 27 kDa protein on Western blot analysis of osteoblast lysates. We localized BEST5 protein in osteoblast progenitor cells and mature osteoblasts in sections of rat tibiae and in sections of bones loaded in vivo to induce adaptive bone formation. Best5 may therefore be a fundamental intermediate in the response of osteoblasts to stimuli that modulate proliferation/differentiation, such as interferons or mechanical loading. These findings highlight the dose interactions between the immune system and bone cells and may open new therapeutic avenues in modulating bone mass.

Publication metadata

Author(s): Birch M; Grewal TS; Genever PG; Brabbs AC; Skerry TM

Publication type: Article

Publication status: Published

Journal: FASEB Journal

Year: 2000

Volume: 14

Issue: 3

Pages: 523-531

ISSN (print): 0892-6638

ISSN (electronic): 1530-6860

Publisher: Federation of American Societies for Experiemental Biology


PubMed id: 10698968