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Alpha-1 antitrypsin reduces ovariectomy-induced bone loss in mice
Jay J Cao1, Brian R Gregoire, Li Sun
1USDA, Agricultural Research Service, Grand Forks Human Nutrition Research Center, Grand Forks, North Dakota 58202-9034, USA. Jay.Cao@ars.usda.gov
Annals of the New York Academy of Sciences
|February 25, 2012
Summary
Alpha-1 antitrypsin (AAT) can reduce bone loss caused by estrogen deficiency. This study found AAT treatment improved bone density and reduced bone resorption markers in mice.
Area of Science:
- Biochemistry
- Immunology
- Orthopedics
Background:
- Estrogen deficiency is a major cause of bone loss.
- Proinflammatory cytokines play a key role in this process.
- Alpha-1 antitrypsin (AAT) possesses anti-inflammatory properties.
Purpose of the Study:
- To investigate the potential of AAT in mitigating bone loss associated with estrogen deficiency.
- To determine the effects of AAT on bone metabolism and resorption markers in an ovariectomized mouse model.
Main Methods:
- Ovariectomy (OVX) was performed on mice to induce estrogen deficiency.
- Mice received either AAT or phosphate-buffered saline (PBS) injections.
- Bone mineral density, bone structure, serum markers, and osteoclast activity were analyzed.
Main Results:
- Ovariectomy led to significant bone loss, increased body weight, and elevated serum leptin.
- AAT treatment in OVX mice increased tibial trabecular bone volume and thickness.
- AAT reduced osteoclast numbers and calcitonin receptor expression, and lowered serum osteocalcin.
Conclusions:
- Alpha-1 antitrypsin (AAT) effectively mitigates ovariectomy-induced bone loss in mice.
- AAT appears to exert its protective effects by inhibiting osteoclast activity and bone resorption.
- These findings suggest AAT as a potential therapeutic agent for postmenopausal osteoporosis.
