Brown fat fuels the fire in fever

Area of Science:

• Immunology
• Metabolism
• Physiology

Background:

• Fever is a key host-pathogen defense mechanism involving increased core body temperature.
• Brown adipose tissue (BAT) temperature rises during fever, but its functional role is debated.
• Previous studies questioned the contribution of Uncoupling protein 1 in BAT to fever induction.

Purpose of the Study:

• To investigate the role of metabolic adaptation in brown adipose tissue (BAT) during fever.
• To re-evaluate the contribution of BAT to the febrile response in a host-pathogen defense context.

Main Methods:

• Utilized a Salmonella infection model in mice to study fever.
• Assessed metabolic activity, including fatty acid oxidation, in BAT during infection.

Main Results:

• Fatty acid oxidation was significantly increased in BAT during Salmonella-induced fever.
• Evidence suggests metabolic adaptation in BAT is crucial for the febrile response.

Conclusions:

• Metabolic changes in BAT are critical for fever induction.
• This study re-opens the discussion on BAT's thermogenic and metabolic roles in fever.
• Further research is needed to determine BAT's contribution to host defense against pathogens.