Thermogenic Mechanisms in Brown Adipose Tissue Dynamics

Brown adipose tissue (BAT) is specialised for rapid heat production through mitochondrial uncoupling, a process largely driven by uncoupling protein 1 (UCP1). Upon cold exposure or β-adrenergic stimulation, fatty acids activate UCP1 to facilitate proton leak across the inner mitochondrial membrane, dissipating the proton gradient as heat rather than coupling it to ATP synthesis. This thermogenic response is finely tuned by purine nucleotides, which bind UCP1 and inhibit proton conductance, and by long-term changes in gene expression that govern mitochondrial biogenesis, lipid handling and reactive oxygen species signalling. Recent advances have elucidated structural details of UCP1 regulation, highlighted novel pharmacological targets such as G protein-coupled receptor 120 (GPR120) and transient receptor potential (TRP) channels, and introduced optical and high-resolution imaging tools to monitor heat production at the single-cell level. Together, these insights underpin emerging strategies to harness BAT activity for metabolic health, emphasising the dynamic interplay between molecular regulation, neural and hormonal cues, and tissue remodelling in controlling energy expenditure and body weight.

Research from Nature Portfolio

Studies using molecular simulation and functional assays have revealed how purine nucleotides selectively inhibit UCP1 by binding to conserved residues in its substrate-binding pocket, defining the competitive interactions with activating fatty acids and clarifying the basis for nucleotide-dependent control of proton leak. A complementary approach employed thermosensitive fluorescent dyes targeted to the endoplasmic reticulum of brown adipocytes, enabling real-time optical visualisation of heat production in single cells. This method correlates fluorescence changes with mitochondrial depolarisation, oxygen consumption and extracellular acidification, providing a powerful platform for dissecting thermogenic dynamics and screening modulators of UCP1 activity in both murine and human cells.

Thermogenic Mechanisms in Brown Adipose Tissue Dynamics publication trend

The graph below shows the total number of articles in thermogenic mechanisms in brown adipose tissue dynamics across all publications each year (not limited to Nature Index journals).

Technical terms

Brown adipose tissue (BAT): A thermogenic organ rich in mitochondria and UCP1 that dissipates chemical energy as heat.

Uncoupling protein 1 (UCP1): A mitochondrial inner-membrane carrier that mediates proton leak, bypassing ATP synthesis to generate heat.

Proton leak: The passive movement of protons across the mitochondrial membrane uncoupled from ATP production, releasing energy as heat.

Adrenergic stimulation: Activation of brown adipocytes by noradrenaline through β-adrenergic receptors, triggering thermogenic signalling cascades.

Transient receptor potential (TRP) channels: Ion channels that sense temperature and chemical stimuli, linking external cues to sympathetic activation of BAT.

GPR120: A G protein-coupled receptor on brown adipocytes whose activation promotes mitochondrial respiration and thermogenesis.

References

1. Molecular determinants of inhibition of UCP1-mediated respiratory uncoupling. Nature Communications (2023).
2. Structural basis of purine nucleotide inhibition of human uncoupling protein 1. Science Advances (2023).
3. Optical visualisation of thermogenesis in stimulated single-cell brown adipocytes. Scientific Reports (2017).
4. The GPR120 agonist TUG‐891 promotes metabolic health by stimulating mitochondrial respiration in brown fat. EMBO Molecular Medicine (2018).
5. Brown Adipose Tissue, Diet-Induced Thermogenesis, and Thermogenic Food Ingredients: From Mice to Men. Frontiers in Endocrinology (2020).