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Short-term local injections of transforming growth factor-β1 decrease ovariectomy-stimulated osteoclastic resorption in vivo in rats
- Source :
- Journal of Bone and Mineral Research. 10:971-977
- Publication Year :
- 2009
- Publisher :
- Wiley, 2009.
-
Abstract
- Estrogen deficiency in rats is responsible for increased osteoclastic resorption and a subsequent rapid bone loss. TGF-beta, which is known to have acute effects on bone resorption in several in vitro models, has been shown to be secreted by osteoblastic cells in vitro in response to 17 beta-estradiol, but little is known about its in vivo effects on bone resorption. We therefore decided to investigate the short-term effect of TGF-beta 1 on bone resorption in ovariectomized rats. TGF-beta 1 (0.04-20 ng/injection), or vehicle, was injected daily directly into the bone marrow space, through a thin catheter implanted in the distal end of the right femur, during 4 consecutive days, starting 14 days after the ovariectomy. Bone histomorphometry was performed in the secondary spongiosa of the metaphysis of injected femurs and compared with vehicle-injected femurs of sham ovariectomized rats. Ovariectomy was associated with a marked increase in the resorption surface, a 2-fold increase in the number of osteoclasts, and no change in the number of TRAP-positive marrow cells distant from bone surfaces. Bone resorption was significantly lower in the TGF-beta 1-injected bones of ovariectomized rats, as compared with vehicle injected bones: the osteoclast surface and the number of osteoclasts were, respectively, 11.0 +/- 5.1% versus 20.8 +/- 1.3% and 287 +/- 41 versus 505 +/- 53, in bones injected with 0.2 ng of TGF-beta 1 as compared with vehicle-injected bones (mean +/- SE, p < 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)
- Subjects :
- medicine.medical_specialty
Bone disease
Ovariectomy
Endocrinology, Diabetes and Metabolism
Osteoporosis
Osteoclasts
Metaphysis
Bone resorption
Catheterization
Rats, Sprague-Dawley
Bone Marrow
Transforming Growth Factor beta
Osteoclast
Internal medicine
Animals
Humans
Medicine
Orthopedics and Sports Medicine
Femur
Bone Resorption
Osteoporosis, Postmenopausal
Analysis of Variance
Bone Development
Dose-Response Relationship, Drug
business.industry
Estrogens
Tetracycline
medicine.disease
Rats
Resorption
Disease Models, Animal
medicine.anatomical_structure
Endocrinology
Ovariectomized rat
Female
Bone marrow
business
Subjects
Details
- ISSN :
- 08840431
- Volume :
- 10
- Database :
- OpenAIRE
- Journal :
- Journal of Bone and Mineral Research
- Accession number :
- edsair.doi.dedup.....a7c4c4e3787a0b2377b7241360c1baa2