[Age-related changes in bone weights and their components in rats]

Area of Science:

• Gerontology
• Comparative Anatomy
• Biochemistry

Context:

• Age-related bone changes are a significant concern in mammalian health.
• Understanding skeletal development and aging in animal models like Wistar rats provides insights into human bone metabolism.
• This study investigates longitudinal changes in bone mass and composition from young adulthood to senescence.

Purpose:

• To comprehensively analyze age-related alterations in bone weight, component composition (water, organic substance, ash), and mineral content (calcium, phosphorus) of the femur, tibia, and lumbar vertebra in Wistar rats.
• To examine age-dependent changes in serum biochemical markers associated with bone metabolism, including calcium, phosphorus, and alkaline phosphatase.
• To determine the age at which peak bone mass and strength are achieved in this Wistar rat model.

Summary:

• Bone weight increased rapidly until 3 months, then gradually until 12 months (females) or 9 months (males), followed by a decrease in males at 27-30 months.
• Bone water content decreased, while ash, calcium, and phosphorus increased from 1 to 6-9 months. In males after 15 months, water increased, and ash, calcium, and phosphorus decreased.
• Serum calcium initially decreased then increased, while serum phosphorus and alkaline phosphatase activity decreased with age, supporting peak bone mass at 12 months.

Impact:

• Provides a detailed timeline of skeletal maturation and aging in Wistar rats, crucial for interpreting results in aging research.
• Establishes reference data for bone composition and serum markers across the lifespan of Wistar rats.
• Informs future studies on age-related bone diseases and potential interventions by characterizing normal aging patterns.