Age-associated adaptations in murine adipose tissues

Area of Science:

• Metabolic research
• Aging studies
• Obesity research

Background:

• Ageing correlates with increased visceral obesity in humans.
• C57Bl/6 mice are common models for obesity and metabolism research.
• Limited data exists on age-related adipose tissue changes in C57Bl/6 mice.

Purpose of the Study:

• To investigate age-associated changes in subcutaneous (SC) and gonadal (GON) adipose tissue in male C57Bl/6 mice.
• To analyze body weight, fat mass, adipocyte size, blood vessel size, and insulin sensitivity across different ages.

Main Methods:

• Male C57Bl/6 mice were studied at 10 weeks, 12 months, and 24 months of age.
• Measurements included total body weight, SC and GON fat mass, adipocyte and blood vessel size.
• Plasma leptin, insulin, and glucose levels were analyzed to assess metabolic status.

Main Results:

• Body weight and SC/GON fat mass increased from 10 weeks to 12 months, then decreased by 24 months.
• Adipocyte and blood vessel sizes followed a similar biphasic pattern.
• Insulin sensitivity improved with age, indicated by lower insulin and glucose levels in older mice.
• Plasma leptin levels positively correlated with body weight and fat mass.

Conclusions:

• Male C57Bl/6 mice exhibit a biphasic pattern of body weight and adipose tissue changes during aging.
• Age-related alterations in fat depots are accompanied by improved insulin sensitivity.
• These findings provide insights into the aging process and metabolic changes in a key mouse model.