An irradiation-altered bone marrow microenvironment impacts anabolic actions of PTH

A. J. Koh, C. M. Novince, Xin Li, T. Wang, R. S. Taichman, Laurie K. McCauley

Research output: Contribution to journalArticle

Abstract

PTH stimulates bone formation and increases hematopoietic stem cells through mechanisms as yet uncertain. The purpose of this study was to identify mechanisms by which PTH links actions on cells of hematopoietic origin with osteoblast-mediated bone formation. C57B6 mice (10 d) were nonlethally irradiated and then administered PTH for 5-20 d. Irradiation reduced bone marrow cellularity with retention of cells lining trabeculae. PTH anabolic activity was greater in irradiated vs. nonirradiated mice, which could not be accounted for by altered osteoblasts directly or osteoclasts but instead viaanalteredbonemarrowmicroenvironment. Irradiation increased fibroblast growth factor 2, TGFβ, and IL-6 mRNA levels in the bone marrow in vivo. Irradiation decreased B220 cell numbers, whereas the percent of Lin -Sca-1 +c-kit + (LSK), CD11b +, CD68 +, CD41 +, Lin -CD29 +Sca-1 + cells, and proliferating CD45 -Nestin + cells was increased. Megakaryocyte numbers were reduced with irradiation and located more closely to trabecular surfaces with irradiation and PTH. Bone marrow TGFβ was increased in irradiated PTH-treated mice, and inhibition of TGFβblocked the PTH augmentation of bone in irradiated mice. In conclusion, irradiation created a permissive environment for anabolic actions of PTH that was TGFβ dependent but osteoclast independent and suggests that a nonosteoclast source of TGFβ drives mesenchymal stem cell recruitment to support PTH anabolic actions.

Original languageEnglish (US)
Pages (from-to)4525-4536
Number of pages12
JournalEndocrinology
Volume152
Issue number12
DOIs
StatePublished - Dec 2011

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Bone Marrow
Osteoclasts
Osteoblasts
Osteogenesis
Nestin
Megakaryocytes
Fibroblast Growth Factor 2
Hematopoietic Stem Cells
Mesenchymal Stromal Cells
Interleukin-6
Cell Count
Bone and Bones
Messenger RNA

ASJC Scopus subject areas

  • Endocrinology

Cite this

Koh, A. J., Novince, C. M., Li, X., Wang, T., Taichman, R. S., & McCauley, L. K. (2011). An irradiation-altered bone marrow microenvironment impacts anabolic actions of PTH. Endocrinology, 152(12), 4525-4536. https://doi.org/10.1210/en.2011-1515

An irradiation-altered bone marrow microenvironment impacts anabolic actions of PTH. / Koh, A. J.; Novince, C. M.; Li, Xin; Wang, T.; Taichman, R. S.; McCauley, Laurie K.

In: Endocrinology, Vol. 152, No. 12, 12.2011, p. 4525-4536.

Research output: Contribution to journalArticle

Koh, AJ, Novince, CM, Li, X, Wang, T, Taichman, RS & McCauley, LK 2011, 'An irradiation-altered bone marrow microenvironment impacts anabolic actions of PTH', Endocrinology, vol. 152, no. 12, pp. 4525-4536. https://doi.org/10.1210/en.2011-1515
Koh, A. J. ; Novince, C. M. ; Li, Xin ; Wang, T. ; Taichman, R. S. ; McCauley, Laurie K. / An irradiation-altered bone marrow microenvironment impacts anabolic actions of PTH. In: Endocrinology. 2011 ; Vol. 152, No. 12. pp. 4525-4536.
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