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Title: Sclerostin antibody treatment improves fracture outcomes in a Type I diabetic mouse model

Abstract

Type 1 diabetes mellitus (T1DM) patients have osteopenia and impaired fracture healing due to decreased osteoblast activity. Further, no adequate treatments are currently available that can restore impaired healing in T1DM; hence a significant need exists to investigate new therapeutics for treatment of orthopedic complications. Sclerostin (SOST), a WNT antagonist, negatively regulates bone formation, and SostAb is a potent bone anabolic agent. To determine whether SOST antibody (SostAb) treatment improves fracture healing in streptozotocin (STZ) induced T1DM mice, we administered SostAb twice weekly for up to 21 days post-fracture, and examined bone quality and callus outcomes at 21 days and 42 days post-fracture (11 and 14 weeks of age, respectively). Here we show that SostAb treatment improves bone parameters; these improvements persist after cessation of antibody treatment. Markers of osteoblast differentiation such as Runx2, collagen I, osteocalcin, and DMP1 were reduced, while an abundant number of SP7/osterix-positive early osteoblasts were observed on the bone surface of STZ calluses. These results suggest that STZ calluses have poor osteogenesis resulting from failure of osteoblasts to fully differentiate and produce mineralized matrix, which produces a less mineralized callus. SostAb treatment enhanced fracture healing in both normal and STZ groups, and in STZ +more » SostAb mice, also reversed the lower mineralization seen in STZ calluses. Micro-CT analysis of calluses revealed improved bone parameters with SostAb treatment, and the mineralized bone was comparable to Controls. Additionally, we found sclerostin levels to be elevated in STZ mice and β-catenin activity to be reduced. Consistent with its function as a WNT antagonist, SostAb treatment enhanced β-catenin activity, but also increased the levels of SOST in the callus and in circulation. Lastly, our results indicate that SostAb treatment rescues the impaired osteogenesis seen in the STZ induced T1DM fracture model by facilitating osteoblast differentiation and mineralization of bone.« less

Authors:
 [1];  [2];  [2];  [3];  [4];  [2];  [1];  [4]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Merced, CA (United States)
  2. Regeneron Pharmaceuticals, Tarrytown, NY (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Univ. of California, Merced, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1234603
Report Number(s):
LLNL-JRNL-666626
Journal ID: ISSN 8756-3282
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Bone
Additional Journal Information:
Journal Volume: 82; Journal Issue: C; Journal ID: ISSN 8756-3282
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Sclerostin; Type I diabetes; fracture repair; Streptozotocin; STZ; Osteoblast differentiation; Sclerostin antibody

Citation Formats

Yee, Cristal S., Xie, LiQin, Hatsell, Sarah, Hum, Nicholas, Murugesh, Deepa, Economides, Aris N., Loots, Gabriela G., and Collette, Nicole M. Sclerostin antibody treatment improves fracture outcomes in a Type I diabetic mouse model. United States: N. p., 2015. Web. doi:10.1016/j.bone.2015.04.048.
Yee, Cristal S., Xie, LiQin, Hatsell, Sarah, Hum, Nicholas, Murugesh, Deepa, Economides, Aris N., Loots, Gabriela G., & Collette, Nicole M. Sclerostin antibody treatment improves fracture outcomes in a Type I diabetic mouse model. United States. https://doi.org/10.1016/j.bone.2015.04.048
Yee, Cristal S., Xie, LiQin, Hatsell, Sarah, Hum, Nicholas, Murugesh, Deepa, Economides, Aris N., Loots, Gabriela G., and Collette, Nicole M. Mon . "Sclerostin antibody treatment improves fracture outcomes in a Type I diabetic mouse model". United States. https://doi.org/10.1016/j.bone.2015.04.048. https://www.osti.gov/servlets/purl/1234603.
@article{osti_1234603,
title = {Sclerostin antibody treatment improves fracture outcomes in a Type I diabetic mouse model},
author = {Yee, Cristal S. and Xie, LiQin and Hatsell, Sarah and Hum, Nicholas and Murugesh, Deepa and Economides, Aris N. and Loots, Gabriela G. and Collette, Nicole M.},
abstractNote = {Type 1 diabetes mellitus (T1DM) patients have osteopenia and impaired fracture healing due to decreased osteoblast activity. Further, no adequate treatments are currently available that can restore impaired healing in T1DM; hence a significant need exists to investigate new therapeutics for treatment of orthopedic complications. Sclerostin (SOST), a WNT antagonist, negatively regulates bone formation, and SostAb is a potent bone anabolic agent. To determine whether SOST antibody (SostAb) treatment improves fracture healing in streptozotocin (STZ) induced T1DM mice, we administered SostAb twice weekly for up to 21 days post-fracture, and examined bone quality and callus outcomes at 21 days and 42 days post-fracture (11 and 14 weeks of age, respectively). Here we show that SostAb treatment improves bone parameters; these improvements persist after cessation of antibody treatment. Markers of osteoblast differentiation such as Runx2, collagen I, osteocalcin, and DMP1 were reduced, while an abundant number of SP7/osterix-positive early osteoblasts were observed on the bone surface of STZ calluses. These results suggest that STZ calluses have poor osteogenesis resulting from failure of osteoblasts to fully differentiate and produce mineralized matrix, which produces a less mineralized callus. SostAb treatment enhanced fracture healing in both normal and STZ groups, and in STZ + SostAb mice, also reversed the lower mineralization seen in STZ calluses. Micro-CT analysis of calluses revealed improved bone parameters with SostAb treatment, and the mineralized bone was comparable to Controls. Additionally, we found sclerostin levels to be elevated in STZ mice and β-catenin activity to be reduced. Consistent with its function as a WNT antagonist, SostAb treatment enhanced β-catenin activity, but also increased the levels of SOST in the callus and in circulation. Lastly, our results indicate that SostAb treatment rescues the impaired osteogenesis seen in the STZ induced T1DM fracture model by facilitating osteoblast differentiation and mineralization of bone.},
doi = {10.1016/j.bone.2015.04.048},
journal = {Bone},
number = C,
volume = 82,
place = {United States},
year = {Mon May 04 00:00:00 EDT 2015},
month = {Mon May 04 00:00:00 EDT 2015}
}

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