Fat cells directly sense temperature to activate thermogenesis

Area of Science:

• Metabolic research
• Thermogenesis
• Adipose tissue biology

Background:

• Nonshivering thermogenesis, essential for mammals, relies on mitochondrial uncoupling protein 1 in brown and beige fat.
• Cold exposure typically activates thermogenesis indirectly via sympathetic nervous system and beta-adrenergic signaling.

Purpose of the Study:

• To investigate if cool temperatures can directly activate thermogenic gene programs in adipocytes.
• To explore the cell-autonomous mechanisms of thermogenesis in response to cool environments.

Main Methods:

• Isolated white, beige, and brown adipocytes were exposed to cool temperatures (27-33 °C).
• Gene expression and signaling pathways related to thermogenesis were analyzed.
• Experiments assessed the role of the cAMP/PKA/CREB pathway.

Main Results:

• Cool temperatures directly activated thermogenic gene programs in white and beige adipocytes in a cell-autonomous manner.
• Classic brown adipocytes did not show activation under these conditions.
• The observed activation was independent of the canonical beta-adrenergic signaling pathway (cAMP/PKA/CREB).

Conclusions:

• Adipocytes possess a direct mechanism to sense and respond to cool temperatures, activating thermogenesis.
• This cell-autonomous pathway provides an alternative to sympathetic stimulation for thermoregulation.
• Targeting this direct cool-temperature response in white and beige fat may offer novel therapeutic strategies for obesity and diabetes.