Wise regulates bone deposition through genetic interactions with Lrp5.
In this study using genetic approaches in mouse we demonstrate that the secreted protein Wise plays essential roles in regulating early bone formation through its ability to modulate Wnt signaling via interactions with the Lrp5 co-receptor. In Wise-/- mutant mice we find an increase in the rate of osteoblast proliferation and a transient increase in bone mineral density. This change in proliferation is dependent upon Lrp5, as Wise;Lrp5 double mutants have normal bone mass. This suggests that Wise serves as a negative modulator of Wnt signaling in active osteoblasts. Wise and the closely related protein Sclerostin (Sost) are expressed in osteoblast cells during temporally distinct early and late phases in a manner consistent with the temporal onset of their respective increased bone density phenotypes. These data suggest that Wise and Sost may have common roles in regulating bone development through their ability to control the balance of Wnt signaling. We find that Wise is also required to potentiate proliferation in chondrocytes, serving as a potential positive modulator of Wnt activity. Our analyses demonstrate that Wise plays a key role in processes that control the number of osteoblasts and chondrocytes during bone homeostasis and provide important insight into mechanisms regulating the Wnt pathway during skeletal development.
Stowers Institute for Medical Research, Kansas City, Missouri, United States of America.
Debra L
DL
Ellies
National Institute for Medical Research, The Ridgeway, Mill Hill, London, United Kingdom.
Androulla
A
Economou
Department of Pediatrics, Washington University Medical School, Saint Louis, Missouri, United States of America.
Beth
B
Viviano
Stowers Institute for Medical Research, Kansas City, Missouri, United States of America.
Jean-Philippe
JP
Rey
Department of Pediatrics, Washington University Medical School, Saint Louis, Missouri, United States of America.
Stephenie
S
Paine-Saunders
Stowers Institute for Medical Research, Kansas City, Missouri, United States of America; National Institute for Medical Research, The Ridgeway, Mill Hill, London, United Kingdom; Department of Anatomy and Cell Biology, Kansas University Medical School, Kansas City, Kansas, United States of America.
Robb
R
Krumlauf
Department of Pediatrics, Washington University Medical School, Saint Louis, Missouri, United States of America; Department of Developmental Biology, Washington University Medical School, Saint Louis, Missouri, United States of America.
Scott
S
Saunders
D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D000831:Animals, Newborn; D015519:Bone Density; D019485:Bone Morphogenetic Proteins / Q000235:genetics / Q000378:metabolism*; D049109:Cell Proliferation; D019902:Chondrocytes / Q000378:metabolism; D004622:Embryo, Mammalian / Q000378:metabolism; D005260:Female; D005269:Femur / Q000196:embryology* / Q000378:metabolism; D006023:Glycoproteins / Q000378:metabolism*; D036341:Intercellular Signaling Peptides and Proteins; D060492:Low Density Lipoprotein Receptor-Related Protein-5 / Q000235:genetics / Q000378:metabolism*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009154:Mutation; D010006:Osteoblasts / Q000378:metabolism; D010012:Osteogenesis; D060449:Wnt Signaling Pathway
D048868:Adaptor Proteins, Signal Transducing; D019485:Bone Morphogenetic Proteins; D006023:Glycoproteins; D036341:Intercellular Signaling Peptides and Proteins; D060492:Low Density Lipoprotein Receptor-Related Protein-5; C555483:Lrp5 protein, mouse; C486030:Sost protein, mouse; C483887:Sostdc1 protein, mouse