Propranolol, a β-adrenergic antagonist, attenuates the decrease in trabecular bone mass in high calorie diet fed...

Area of Science:

• Bone biology
• Metabolic disease
• Pharmacology

Background:

• Dietary interventions significantly impact skeletal integrity.
• The role of the beta-adrenergic system in diet-induced bone loss is not fully understood.

Purpose of the Study:

• To investigate the effects of high-calorie and low-calorie diets on skeletal integrity.
• To determine if beta-adrenergic blockade (BB) can prevent bone loss associated with altered caloric intake.

Main Methods:

• Male C57BL/6 mice were fed control, high-calorie, or low-calorie diets for 12 weeks.
• Mice received either vehicle or propranolol (a beta-adrenergic antagonist).
• Evaluated body weight, fat mass, femoral bone mineral density, and osteogenic gene expression.

Main Results:

• High-calorie diets increased body weight and fat mass, effects mitigated by BB.
• Both high and low-calorie diets reduced bone mineral density and osteogenic gene expression.
• BB significantly attenuated bone loss in the high-calorie diet group only.
• Low-calorie diet induced a greater magnitude of bone loss than the high-calorie diet.

Conclusions:

• Caloric restriction and overconsumption negatively affect skeletal development in growing mice.
• Beta-adrenergic blockade offers protection against high-calorie diet-induced bone loss.
• The skeletal response to caloric alteration is diet-specific and influenced by beta-adrenergic signaling.