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Aromatic Bis[aminomethylidenebis(phosphonic)] Acids Prevent Ovariectomy-Induced Bone Loss and Suppress
Anna Nasulewicz-Goldeman1, Waldemar Goldeman2, Anna Nikodem3
1Department of Experimental Oncology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 53-114 Wroclaw, Poland.
Abstract:
Osteoporosis is a skeletal disease associated with excessive bone turnover. Among the compounds with antiresorptive activity, nitrogen-containing bisphosphonates play the most important role in antiosteoporotic treatment. In previous studies, we obtained two aminomethylidenebisphosphonates-benzene-1,4-bis[aminomethylidene(bisphosphonic)] (WG12399C) acid and naphthalene-1,5-bis[aminomethylidene(bisphosphonic)] (WG12592A) acid-which showed a significant antiproliferative activity toward J774E macrophages, a model of osteoclast precursors. The aim of these studies was to evaluate the antiresorptive activity of these aminobisphosphonates in ovariectomized (OVX) Balb/c mice. The influence of WG12399C and WG12592A administration on bone microstructure and bone strength was studied. Intravenous injections of WG12399C and WG12592A bisphosphonates remarkably prevented OVX-induced bone loss; for example, they sustained bone mineral density at control levels and restored other bone parameters such as trabecular separation. This was accompanied by a remarkable reduction in the number of TRAP-positive cells in bone tissue. However, a significant improvement in the quality of bone structure did not correlate with a parallel increase in bone strength. In ex vivo studies, WG12399C and WG12592A remarkably bisphosphonates reduced osteoclastogenesis and partially inhibited the resorptive activity of mature osteoclasts. Our results show interesting biological activity of two aminobisphosphonates, which may be of interest in the context of antiresorptive therapy.
Insights
Two novel aminobisphosphonates, WG12399C and WG12592A, effectively prevented bone loss in ovariectomized mice by reducing bone turnover. While improving bone structure, they did not significantly enhance bone strength, indicating potential for osteoporosis treatment.
Area of Science:
- Biochemistry
- Pharmacology
- Orthopedics
Background:
- Osteoporosis is characterized by excessive bone turnover, with nitrogen-containing bisphosphonates being key antiresorptive agents.
- Previous research identified two aminomethylidenebisphosphonates, WG12399C and WG12592A, with antiproliferative effects on osteoclast precursors.
Purpose of the Study:
- To evaluate the antiresorptive activity of WG12399C and WG12592A in a mouse model of osteoporosis.
- To assess the impact of these compounds on bone microstructure, bone strength, and osteoclast activity.
Main Methods:
- Ovariectomized (OVX) Balb/c mice were treated with intravenous injections of WG12399C and WG12592A.
- Bone mineral density, microstructure (e.g., trabecular separation), and bone strength were analyzed.
- TRAP-positive cells in bone tissue and osteoclastogenesis in ex vivo studies were quantified.
Main Results:
- WG12399C and WG12592A administration prevented OVX-induced bone loss, maintaining bone mineral density and restoring parameters like trabecular separation.
- A significant reduction in TRAP-positive cells was observed, indicating decreased bone turnover.
- While bone structure quality improved, bone strength did not show a parallel increase.
- Ex vivo studies confirmed reduced osteoclastogenesis and partial inhibition of mature osteoclast resorptive activity.
Conclusions:
- The studied aminobisphosphonates exhibit significant antiresorptive activity, effectively combating OVX-induced bone loss in mice.
- These compounds demonstrate potential for developing new therapies for osteoporosis by targeting bone resorption.
- Further investigation is warranted to understand the dissociation between bone structure improvement and bone strength enhancement.
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