Development of thermogenic adipose tissue

Area of Science:

• Physiology
• Metabolic Health
• Adipose Tissue Biology

Background:

• Adipose tissue provides metabolic and insulatory support, but also performs thermogenesis.
• Thermogenic adipocytes utilize uncoupling protein (UCP)-containing mitochondria (UC-mitochondria) to produce heat.
• Thermogenic adipose tissue exists as brown adipose tissue (BAT) and convertible adipose tissue (CAT).

Purpose of the Study:

• To explore the developmental and functional characteristics of thermogenic adipose tissues (BAT and CAT) in endotherms.
• To investigate the postnatal developmental trajectory of CAT, particularly its transition from a thermogenic to a lipid-storing state.
• To examine the species-specific duration of CAT's thermogenic function and its implications for human obesity.

Main Methods:

• Comparative analysis of adipose tissue development across various endothermic species.
• Histological and biochemical examination of adipocyte mitochondria and UCP expression.
• Observation of postnatal developmental changes in CAT in response to environmental temperature.

Main Results:

• BAT expresses UCP and possesses UC-mitochondria throughout life in certain species.
• CAT develops thermogenic capacity in utero or early postnatal life but transitions to a lipid-storing form.
• The duration of CAT's thermogenic function varies significantly, with humans retaining this capacity for up to 15-20 years.

Conclusions:

• Postnatal environmental temperature influences CAT development and function.
• The prolonged postnatal plasticity of human CAT suggests a potential role in regulating obesity.
• Further research is needed to elucidate the precise role of thermogenic adipose tissue in human metabolic health.