Nephroblastoma overexpressed (Nov) is a novel bone morphogenetic protein antagonist.

Abstract:

:Nephroblastoma overexpressed (Nov), a member of the CCN family of proteins, is expressed by osteoblasts and its transcription is regulated by transforming growth factor (TGF)-beta and bone morphogenetic proteins (BMP). CCN proteins can interact with TGF-beta, BMPs, and Wnt. We explored the function of Nov in skeletal cells, in vitro and in vivo. Constitutive overexpression of Nov in cells of the osteoblastic lineage impaired osteoblastic differentiation, opposed the biological effects of BMP-2 and Wnt 3 and impaired BMP-2 and Wnt signaling, indicating that Nov has BMP-2 antagonistic activity. Transgenic mice overexpressing Nov under the control of the osteocalcin promoter exhibited osteopenia secondary to decreased bone formation, confirming the effects in vitro. GST pulldown experiments demonstrated direct Nov-BMP interactions. In conclusion, Nov has BMP antagonistic properties and inhibits osteoblastogenesis and osteoblastic function.

journal_name

Ann N Y Acad Sci

authors

Canalis E

doi

10.1196/annals.1402.055

subject

Has Abstract

pub_date

2007-11-01 00:00:00

pages

50-8

eissn

0077-8923

issn

1749-6632

pii

1116/1/50

journal_volume

1116

pub_type

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