Asymmetric Dimethylarginine is Not Involved in Ovariectomy-Induced Osteopenia in Rats
Abstract:Previous studies have indicated that the plasma concentration of nitric oxide synthase inhibitor, asymmetric dimethylarginine (ADMA), was increased in postmenopausal women. In the study reported here, we tested the relationship between the decrease of bone mineral density (BMD) and ADMA concentration in ovariectomized (OVX) rats. Ovariectomized rats at 8 months of age were treated with 17-estradiol (10 or 30 g/kg of body weight/day, s.c.) or L-arginine (300 mg/kg/day, i.p.) for 12 weeks (n = 10 for each group). Pre-and posttreatment total BMD, posttreatment plasma nitrite/nitrate and ADMA concentrations, and posttreatment BMD in the lumbar part of the spine (L4–L6), femurs, and tibias were examined. Ovariectomy caused a significant decrease in several BMD indexes, which was reversed by estrogen treatment (P < 0.05). Plasma nitrite/nitrate concentration was significantly decreased in OVX rats, but was restored by estrogen treatment (P < 0.05). There were no differences in the plasma concentration of ADMA in OVX or estrogen-treated rats. L-Arginine had no effect on plasma nitrite/nitrate concentration and BMD in OVX rats. These results suggest that ovariectomy does not influence the plasma concentration of ADMA, and that ADMA is not involved in ovariectomy-induced osteopenia in rats.
Document Type: Research Article
Affiliations: 1: Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, Hunan 410078, China 2: Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Xiang-Ya Road 110, Changsha, Hunan 410078, China
Publication date: 2005-02-01
Comparative Medicine (CM), an international journal of comparative and experimental medicine, is the leading English-language publication in the field and is ranked by the Science Citation Index in the upper third of all scientific journals. The mission of CM is to disseminate high-quality, peer-reviewed information that expands biomedical knowledge and promotes human and animal health through the study of laboratory animal disease, animal models of disease, and basic biologic mechanisms related to disease in people and animals.
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