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Intermittent PTH Administration Increases Bone-Specific Blood Vessels and Surrounding Stromal Cells in Murine Long Bones

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Abstract

To verify whether PTH acts on bone-specific blood vessels and on cells surrounding these blood vessels, 6-week-old male mice were subjected to vehicle (control group) or hPTH [1–34] (20 µg/kg/day, PTH group) injections for 2 weeks. Femoral metaphyses were used for histochemical and immunohistochemical studies. In control metaphyses, endomucin-positive blood vessels were abundant, but αSMA-reactive blood vessels were scarce. In the PTH-administered mice, the lumen of endomucin-positive blood vessels was markedly enlarged. Moreover, many αSMA-positive cells were evident near the blood vessels, and seemed to derive from those vessels. These αSMA-positive cells neighboring the blood vessels showed features of mesenchymal stromal cells, such as immunopositivity for c-kit and tissue nonspecific alkaline phosphatase (TNALP). Thus, PTH administration increased the population of perivascular/stromal cells positive for αSMA and c-kit, which were likely committed to the osteoblastic lineage. To understand the cellular events that led to increased numbers and size of bone-specific blood vessels, we performed immunohistochemical studies for PTH/PTHrP receptor and VEGF. After PTH administration, PTH/PTHrP receptor, VEGF and its receptor flk-1 were consistently identified in both osteoblasts and blood vessels (endothelial cells and surrounding perivascular cells). Our findings suggest that exogenous PTH increases the number and size of bone-specific blood vessels while fostering perivascular/stromal cells positive for αSMA/TNALP/c-kit.

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Funding

This study was partially supported by grants from Japanese Society for the Promotion of Science (JSPS, 19K10040 to Hasegawa T) and partially supported by a grant-in-aid for young scientists provided by the Japanese Association for Oral Biology and Kazato Research Foundation (Hasegawa T) and by Japan China Sasakawa Medical Fellowship (Zhao S).

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Contributions

TH designed the study and prepared the first draft of the paper as a corresponding author. SZ is the researcher mainly in charge of this work, including RT-PCR, immunohistochemistry and TEM observation experiments. HH, MA, TY contributed to the experimental work including the preparation of paraffin samples of PTH-administered mice. TY was responsible for statistics. PHLF, ML, KT and NA participated in the discussion, editing and formatting of the manuscript. All authors revised the paper for intellectual content and approved its final version.

Corresponding author

Correspondence to Tomoka Hasegawa.

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Conflict of interest

Shen Zhao, Tomoka Hasegawa, Hiromi Hongo, Tomomaya Yamamoto, Miki Abe, Taiji Yoshida, Mai Haraguchi, Paulo Henrique Luiz de Freitas, Minqi Li, Kanchu Tei, and Norio Amizuka declare no competing interests.

Animal Rights and Informed Consent

All animal experiments in this study were conducted under the Hokkaido University Guidelines for Animal Experimentation. The experimental  protocol was approved by the Hokkaido University Animal Care and Use Commitee which is accredited by the Association for Assessment and Accreditation of Laboratory Animal Care (approved research proposal #15-0032).

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Zhao, S., Hasegawa, T., Hongo, H. et al. Intermittent PTH Administration Increases Bone-Specific Blood Vessels and Surrounding Stromal Cells in Murine Long Bones. Calcif Tissue Int 108, 391–406 (2021). https://doi.org/10.1007/s00223-020-00776-2

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