IGF-I receptor is required for the anabolic actions of parathyroid hormone on bone.

IGF-I receptor is required for the anabolic actions of parathyroid hormone on bone. Research Abstract Details 

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IGF-I receptor is required for the anabolic actions of parathyroid hormone on bone. Abstract Text:

Yongmei Wang,Shigeki Nishida,Benjamin M Boudignon,Andrew Burghardt,Hashem Z Elalieh,Michelle M Hamilton,Sharmila Majumdar,Bernard P Halloran,Thomas L Clemens,Daniel D Bikle,

We showed that the IGF-IR-null mutation in mature osteoblasts leads to less bone and decreased periosteal bone formation and impaired the stimulatory effects of PTH on osteoprogenitor cell proliferation and differentiation. INTRODUCTION: This study was carried out to examine the role of IGF-I signaling in mediating the actions of PTH on bone. MATERIALS AND METHODS: Three-month-old mice with an osteoblast-specific IGF-I receptor null mutation (IGF-IR OBKO) and their normal littermates were treated with vehicle or PTH (80 microg/kg body weight/d for 2 wk). Structural measurements of the proximal and midshaft of the tibia were made by microCT. Trabecular and cortical bone formation was measured by bone histomorphometry. Bone marrow stromal cells (BMSCs) were obtained to assess the effects of PTH on osteoprogenitor number and differentiation. RESULTS: The fat-free weight of bone normalized to body weight (FFW/BW), bone volume (BV/TV), and cortical thickness (C.Th) in both proximal tibia and shaft were all less in the IGF-IR OBKO mice compared with controls. PTH decreased FFW/BW of the proximal tibia more substantially in controls than in IGF-IR OBKO mice. The increase in C.Th after PTH in the proximal tibia was comparable in both control and IGF-IR OBKO mice. Although trabecular and periosteal bone formation was markedly lower in the IGF-IR OBKO mice than in the control mice, endosteal bone formation was comparable in control and IGF-IR OBKO mice. PTH stimulated endosteal bone formation only in the control animals. Compared with BMSCs from control mice, BMSCs from IGF-IR OBKO mice showed equal alkaline phosphatase (ALP)(+) colonies on day 14, but fewer mineralized nodules on day 28. Administration of PTH increased the number of ALP(+) colonies and mineralized nodules on days 14 and 28 in BMSCs from control mice, but not in BMSCs from IGF-IR OBKO mice. CONCLUSIONS: Our results indicate that the IGF-IR null mutation in mature osteoblasts leads to less bone and decreased bone formation, in part because of the requirement for the IGF-IR in mature osteoblasts to enable PTH to stimulate osteoprogenitor cell proliferation and differentiation.

IGF-I receptor is required for the anabolic actions of parathyroid hormone on bone. Publishing Authors By Initials

Y Wang,S Nishida,BM Boudignon,A Burghardt,HZ Elalieh,MM Hamilton,S Majumdar,BP Halloran,TL Clemens,DD Bikle,

For similar biological phenomena, cell phenomena, and immunity: cell physiology: cell communication: signal transduction research abstracts see: biological phenomena, cell phenomena, and immunity: cell physiology: cell communication: signal transduction research

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IGF-I receptor is required for the anabolic actions of parathyroid hormone on bone. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Journal of bone and mineral research : the officia

VOLUME: 22

Page Numbers: 1329-37

Journal Abbreviation: J. Bone Miner. Res.

ISSN: 0884-0431

DAY: 3

MONTH: Sep

YEAR: 2007

IGF-I receptor is required for the anabolic actions of parathyroid hormone on bone. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 8610640

IGF-I receptor is required for the anabolic actions of parathyroid hormone on bone. Keywords Mesh Terms:

KEYWORDS: Signal Transduction

MESH TERMS: physiology

Chemical & Substance for Abstract: IGF-I receptor is required for the anabolic actions of parathyroid hormone on bone. Information

Substance Name: Receptor, IGF Type 1

Registry Number: EC 2.7.1.112

Grant and Affiliation Information for IGF-I receptor is required for the anabolic actions of parathyroid hormone on bone.

AFFILIATION: Department of Medicine, Endocrine Unit, Veterans Affairs Medical Center, San Francisco, California 94121, USA.

Country: United States

AGENCY: United States NIDDK

GRANT: R01 DK54793

ACRONYM: DK

MEDLINETA: J Bone Miner Res

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