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您的检索式：作者名="David R.Powell"
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| 1 | NOTUM inhibition increases endocortical bone formation and bone strength显示文摘The disability,mortality and costs caused by non-vertebral osteoporotic fractures are enormous.Existing osteoporosis therapies are highly effective at reducing vertebral but not non-vertebral fractures.Cortical bone is a major determinant of non-vertebral bone strength.To identify novel osteoporosis drug targets,we phenotyped cortical bone of 3 366 viable mouse strains with global knockouts of druggable genes.Cortical bone thickness was substantially elevated in Notum?/?mice.NOTUM is a secreted WNT lipase and we observed high NOTUM expression in cortical bone and osteoblasts but not osteoclasts.Three orally active small molecules and a neutralizing antibody inhibiting NOTUM lipase activity were developed.They increased cortical bone thickness and strength at multiple skeletal sites in both gonadal intact and ovariectomized rodents by stimulating endocortical bone formation.Thus,inhibition of NOTUM activity is a potential novel anabolic therapy for strengthening cortical bone and preventing non-vertebral fractures. | Robert Brommage Jeff Liu Peter Voge Faika Mseeh Andrea Y.Thompson David G.Potter Melanie K.Shadoan Gwenn M.Hansen Sabrina Jeter-Jones Jie Cui Dawn Bright Jennifer P.Bardenhagen Deon D.Doree Sofia Moverare-Skrtic Karin H.Nilsson Petra Henning Ulf H.Lerner Claes Ohlsson Arthur T.Sands James E.Tarver David R.Powell Brian Zambrowicz Qingyun Liu | 2019 | Bone Research2019，7，1： | 2 |
| 2 | Skeletal phenotypes in secreted frizzled-related protein 4 gene knockout mice mimic skeletal architectural abnormalities in subjects with Pyle's disease from SFRP4 mutations显示文摘Mutations in SFRP4 cause Pyle’s bone disease with wide metaphyses and increased skeletal fragility.The WNT signaling pathway plays important roles in determining skeletal architecture and SFRP4 is a secreted Frizzled decoy receptor that inhibits WNT signaling.Seven cohorts of male and female Sfrp4 gene knockout mice,examined through 2 years of age,had a normal lifespan but showed cortical and trabecular bone phenotypes.Mimicking human Erlenmeyer flask deformities,bone cross-sectional areas were elevated 2-fold in the distal femur and proximal tibia but only 30%in femur and tibia shafts.Reduced cortical bone thickness was observed in the vertebral body,midshaft femur and distal tibia.Elevated trabecular bone mass and numbers were observed in the vertebral body,distal femur metaphysis and proximal tibia metaphysis.Midshaft femurs retained extensive trabecular bone through 2 years of age.Vertebral bodies had increased compressive strength,but femur shafts had reduced bending strength.Trabecular,but not cortical,bone parameters in heterozygous Sfrp4mice were modestly affected.Ovariectomy resulted in similar declines in both cortical and trabecular bone mass in wild-type and Sfrp4 KO mice.SFRP4 is critical for metaphyseal bone modeling involved in determining bone width.Sfrp4 KO mice show similar skeletal architecture and bone fragility deficits observed in patients with Pyle’s disease with SFRP4 mutations. | Robert Brommage Jeff Liu David R.Powell | 2023 | Bone Research2023，11，1： | 0 |
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