Increased bone formation by intermittent parathyroid hormone administration is due to the stimulation of proliferation and differentiation of osteoprogenitor cells in bone marrow

In order to examine the mechanism of the anabolic effect of parathyroid hormone (PTH) on bone formation, human PTH(1-34) [hPTH(1-34)] (30 μg/kg) was injected subcutaneously to 9-week-old rats 5 times a week for 1 or 3 weeks. Trabecular bone volume (BV/TV) in the tibial metaphysis was not significant...

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Veröffentlicht in:Bone (New York, N.Y.) N.Y.), 1994-11, Vol.15 (6), p.717-723
Hauptverfasser: Nishida, S., Yamaguchi, A., Tanizawa, T., Endo, N., Mashiba, T., Uchiyama, Y., Suda, T., Yoshiki, S., Takahashi, H.E.
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container_issue 6
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container_title Bone (New York, N.Y.)
container_volume 15
creator Nishida, S.
Yamaguchi, A.
Tanizawa, T.
Endo, N.
Mashiba, T.
Uchiyama, Y.
Suda, T.
Yoshiki, S.
Takahashi, H.E.
description In order to examine the mechanism of the anabolic effect of parathyroid hormone (PTH) on bone formation, human PTH(1-34) [hPTH(1-34)] (30 μg/kg) was injected subcutaneously to 9-week-old rats 5 times a week for 1 or 3 weeks. Trabecular bone volume (BV/TV) in the tibial metaphysis was not significantly different between the PTH- and vehicletreated groups, but the parameters related to bone formation, including osteoid surface (OS/BS), mineralizing surface (MS/BS), mineral apposition rate (MAR), and bone formation rate (BFR/BS), were significantly increased as early as 1 week after PTH treatment. And the parameters related to bone resorption including eroded surface (ES/BS) and osteoclast number (N.Oc/BS) were also significantly increased as early as 1 week after PTH treatment. Treatment with PTH for 1 week induced no significant increase in bone mineral density at the femoral metaphysis, whereas the same treatment for 3 weeks induced a significant increase. When bone marrow cells isolated from femora and tibiae of either PTH- or vehicle-treated rats were cultured at a high density (2 × 10 7 cells/one well of 24-multiwell plate), cellular alkaline phosphatase (ALP) activity was significantly increased in the cells isolated from PTH-treated rats compared with vehicletreated rats. When bone marrow cells were cultured at a low density (4 × 10 6 cells/a one well of 6-multiwell plate) to generate colonies (colony forming unit-fibroblastic, CFU-F), PTH induced apparent increases in both the total number of CFU-F and the number of ALP-positive CFU-F. The ratio of the latter to the former was significantly higher in the PTH-treated group than in the vehicle-treated group. These findings suggest that the anabolic effect of PTH is, at least in part, due to the stimulation of proliferation and differentiation of osteoprogenitor cells in bone marrow.
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Trabecular bone volume (BV/TV) in the tibial metaphysis was not significantly different between the PTH- and vehicletreated groups, but the parameters related to bone formation, including osteoid surface (OS/BS), mineralizing surface (MS/BS), mineral apposition rate (MAR), and bone formation rate (BFR/BS), were significantly increased as early as 1 week after PTH treatment. And the parameters related to bone resorption including eroded surface (ES/BS) and osteoclast number (N.Oc/BS) were also significantly increased as early as 1 week after PTH treatment. Treatment with PTH for 1 week induced no significant increase in bone mineral density at the femoral metaphysis, whereas the same treatment for 3 weeks induced a significant increase. 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When bone marrow cells isolated from femora and tibiae of either PTH- or vehicle-treated rats were cultured at a high density (2 × 10 7 cells/one well of 24-multiwell plate), cellular alkaline phosphatase (ALP) activity was significantly increased in the cells isolated from PTH-treated rats compared with vehicletreated rats. When bone marrow cells were cultured at a low density (4 × 10 6 cells/a one well of 6-multiwell plate) to generate colonies (colony forming unit-fibroblastic, CFU-F), PTH induced apparent increases in both the total number of CFU-F and the number of ALP-positive CFU-F. The ratio of the latter to the former was significantly higher in the PTH-treated group than in the vehicle-treated group. 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Trabecular bone volume (BV/TV) in the tibial metaphysis was not significantly different between the PTH- and vehicletreated groups, but the parameters related to bone formation, including osteoid surface (OS/BS), mineralizing surface (MS/BS), mineral apposition rate (MAR), and bone formation rate (BFR/BS), were significantly increased as early as 1 week after PTH treatment. And the parameters related to bone resorption including eroded surface (ES/BS) and osteoclast number (N.Oc/BS) were also significantly increased as early as 1 week after PTH treatment. Treatment with PTH for 1 week induced no significant increase in bone mineral density at the femoral metaphysis, whereas the same treatment for 3 weeks induced a significant increase. When bone marrow cells isolated from femora and tibiae of either PTH- or vehicle-treated rats were cultured at a high density (2 × 10 7 cells/one well of 24-multiwell plate), cellular alkaline phosphatase (ALP) activity was significantly increased in the cells isolated from PTH-treated rats compared with vehicletreated rats. When bone marrow cells were cultured at a low density (4 × 10 6 cells/a one well of 6-multiwell plate) to generate colonies (colony forming unit-fibroblastic, CFU-F), PTH induced apparent increases in both the total number of CFU-F and the number of ALP-positive CFU-F. The ratio of the latter to the former was significantly higher in the PTH-treated group than in the vehicle-treated group. These findings suggest that the anabolic effect of PTH is, at least in part, due to the stimulation of proliferation and differentiation of osteoprogenitor cells in bone marrow.</abstract><cop>New York, NY</cop><pub>Elsevier Inc</pub><pmid>7873302</pmid><doi>10.1016/8756-3282(94)90322-0</doi><tpages>7</tpages></addata></record>
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ispartof Bone (New York, N.Y.), 1994-11, Vol.15 (6), p.717-723
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source MEDLINE; Elsevier ScienceDirect Journals
subjects Alkaline Phosphatase - metabolism
Animals
Biological and medical sciences
Biomechanical Phenomena
Bone Density - drug effects
Bone Development - drug effects
Bone Marrow - drug effects
Bone Marrow Cells
Bone marrow stromal cell
Cell Count
Cell Differentiation - drug effects
Cell Division - drug effects
Cells, Cultured
CFU-F
Colony-Forming Units Assay
Female
Femur - drug effects
Fundamental and applied biological sciences. Psychology
Hormones. Regulation
Humans
Injections, Subcutaneous
Osteoclasts - drug effects
Osteoprogenitor cells
Parathyroid hormone
Parathyroid Hormone - administration & dosage
Parathyroid Hormone - pharmacology
Peptide Fragments - administration & dosage
Peptide Fragments - pharmacology
Rats
Rats, Sprague-Dawley
Stem Cells - cytology
Stem Cells - drug effects
Teriparatide
Thyroid. Parathyroid. Ultimobranchial body
Tibia - drug effects
Vertebrates: endocrinology
title Increased bone formation by intermittent parathyroid hormone administration is due to the stimulation of proliferation and differentiation of osteoprogenitor cells in bone marrow
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