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Calcified Tissue International

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01.12.2015 | Original Research

Exogenous Parathyroid Hormone-Related Peptide Promotes Fracture Healing in Lepr(−/−) Mice

verfasst von: Anlong Liu, Yishan Li, Yinhe Wang, Li Liu, Hongfei Shi, Yong Qiu

Erschienen in: Calcified Tissue International | Ausgabe 6/2015

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Abstract

Diabetic osteoporosis continues to surge worldwide, increasing the risk of fracture. We have previously demonstrated that haploinsufficiency of endogenous parathyroid hormone-related peptide (PTHrP) impairs fracture healing. However, whether an exogenous supply of PTHrP can repair bone damage and accelerate fracture healing remains unclear. This study aimed to assess the efficacy and safety of PTHrP in healing fractures. Standardized mid-diaphyseal femur fractures were generated in 12-week-old wild-type and leptin receptor null Lepr(−/−) mice. After administration of PTHrP for 2 weeks, callus tissue properties were analyzed by radiography, micro-computed tomography, histology, histochemistry, immunohistochemistry, and molecular biology techniques. At 2 weeks post-fracture, cartilaginous callus areas were reduced, while total callus and bony callus areas were increased in PTHrP-treated Lepr(−/−) animals and control wild-type mice, compared with vehicle-treated Lepr(−/−) mice. The following parameters were enhanced both in Lepr(−/−) mice after treatment with PTHrP and vehicle-treated wild-type animals, compared with vehicle-treated Lepr(−/−) mice: osteoblast numbers; tissue alkaline phosphatase (ALP) and Type I collagen immunopositive areas; mRNA levels of ALP, Type I collagen, osteoprotegerin, and receptor activator for nuclear factor-κ B ligand; protein levels of Runt-related transcription factor 2 and insulin-like growth factor-1; and the number and surface of osteoclasts. In conclusion, exogenous PTHrP by subcutaneous injection promotes fracture repair in Lepr(−/−) mice by increasing callus formation and accelerating cell transformation: upregulated osteoblastic gene and protein expression, increased endochondral bone formation, osteoblastic bone formation, and osteoclastic bone resorption. However, complete repair was not obtained in PTHrP-treated Lepr(−/−) mice as in control wild-type animals.

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Titel: Exogenous Parathyroid Hormone-Related Peptide Promotes Fracture Healing in Lepr(−/−) Mice
verfasst von: Anlong Liu
Yishan Li
Yinhe Wang
Li Liu
Hongfei Shi
Yong Qiu
Publikationsdatum: 01.12.2015
Verlag: Springer US
Erschienen in: Calcified Tissue International / Ausgabe 6/2015
Print ISSN: 0171-967X
Elektronische ISSN: 1432-0827
DOI: https://doi.org/10.1007/s00223-015-0041-2

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Exogenous Parathyroid Hormone-Related Peptide Promotes Fracture Healing in Lepr(−/−) Mice

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