Abstract
Animal studies suggest that bone remodeling is under β-adrenergic control via the sympathetic nervous system. The purpose of this study was to examine the preventive effect of different doses of nonspecific β-blockers (propranolol) on trabecular and cortical bone envelopes in ovariectomized rats. Six-month-old female Wistar rats were ovariectomized (OVX, n = 60) or sham-operated (n = 15). Then, OVX rats were subcutaneously injected with 0.1 (n = 15), 5 (n = 15), or 20 (n = 15) mg/kg propranolol or vehicle (n = 15) for 10 weeks. Tibial and femoral bone mineral density (BMD) were analyzed longitudinally by dual-energy X-ray absorptiometry. At death, the left tibial metaphysis and L4 vertebrae were removed, and microcomputed tomography (Skyscan 1072; Skyscan, Aartselaar, Belgium) was performed for trabecular bone structure investigation. Histomorphometry analysis was performed on the right proximal tibia to assess bone cell activities. After 10 weeks, OVX rats had decreased BMD and trabecular parameters and increased bone turnover, as well as cortical porosity compared with the sham group (p < 0.001). Bone architecture alteration was preserved by 0.1 mg/kg propranolol due to higher trabecular number and thickness (+50.35 and +6.81%, respectively, than OVX; p < 0.001) and lower cortical pore number (–52.38% than OVX; p < 0.001). Animals treated by 0.1 mg/kg propranolol had a lower osteoclast surface and a higher osteoblast activity compared with OVX. Animals treated by 20 mg of propranolol did not significantly differ from OVX rats. Animals treated by 5 mg of propranolol have been partially preserved from the ovariectomy. These results showed a dose effect of β-blockers. The lower the dose of propranolol breeding, the better the preventive effect against ovariectomy.
Footnotes
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Article, publication date, and citation information can be found at http://jpet.aspetjournals.org.
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doi:10.1124/jpet.106.105437.
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ABBREVIATIONS: SNS, sympathetic nervous system; BMD, bone mineral density; KO, knockout; OVX, ovariectomized; SHAM, sham-operated; DXA, dual-energy X-ray absorptiometry; OVX PRO, OVX with propranolol; CV, coefficient(s) of variation; BMC, bone mineral content; μCT, microcomputed tomograph; BV/TV, trabecular bone volume; Tb.N, trabecular number; Tb.Sp, trabecular separation; Tb.Th, trabecular thickness; SMI, structure model index; DA, degree of anisotropy; Ct.Po, porosity; Oc.S/BS, osteoclastic surfaces; MAR, mineral apposition rate; MS/BS, mineralizing surface per bone surface; ML, mediolateral; AP, anteroposterior.
- Received March 29, 2006.
- Accepted May 31, 2006.
- The American Society for Pharmacology and Experimental Therapeutics
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