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Greater bone formation of Y2 knockout mice is associated with increased osteoprogenitor numbers and altered Y1 receptor expression


Germ line or hypothalamus-specific deletion of Y2 receptors in mice results in a doubling of trabecular bone volume. However, the specific mechanism by which deletion of Y2 receptors increases bone mass has not yet been identified. Here we show that cultured adherent bone marrow stromal cells from Y2(-/-) mice also demonstrate increased mineralization in vitro. Isolation of two populations of progenitor cell types, an immature mesenchymal stem cell population and a more highly differentiated population of progenitor cells, revealed a greater number of the progenitor cells within the bone of Y2(-/-) mice. Analysis of Y receptor transcripts in cultured stromal cells from wild-type mice revealed high levels of Y1 but not Y2, Y4, Y5, or y6 receptor mRNA. Interestingly, germ line Y2 receptor deletion causes Y1 receptor down-regulation in stromal cells and bone tissue possibly due to the lack of feedback inhibition of NPY release and subsequent overstimulation of Y1 receptors. Furthermore, deletion of Y1 receptors resulted in increased bone mineral density in mice. Together, these findings indicate that the greater number of mesenchymal progenitors and the altered Y1 receptor expression within bone cells in the absence of Y2 receptors are a likely mechanism for the greater bone mineralization in vivo and in vitro, opening up potential new treatment avenues for osteoporosis.

Type Journal
ISBN 0021-9258 (Print)
Authors Lundberg, P.;Allison, S. J.;Lee, N. J.;Baldock, P. A.;Brouard, N.;Rost, S.;Enriquez, R. F.;Sainsbury, A.;Lamghari, M.;Simmons, P.;Eisman, J. A.;Gardiner, E. M.;Herzog, H. :
Garvan Authors Prof Herbert Herzog , Dr Paul Baldock
Publisher Name J BIOL CHEM
Published Date 2007-01-01 00:00:00
Published Volume 282
Published Issue 26
Published Pages 19082-91
Status Published In-print
OpenAccess Link Lundberg JBC.pdf