Thermogenesis in Adipose Tissue: Adrenergic and Non-Adrenergic Pathways

Area of Science:

• Metabolic research
• Adipose tissue biology
• Obesity therapeutics

Background:

• Obesity is a global epidemic driven by energy imbalance.
• Brown (BAT) and beige adipose tissues promote energy expenditure (EE) via non-shivering thermogenesis (NST).
• Canonical adrenergic pathways show limited translational success in humans for obesity treatment.

Purpose of the Study:

• To review alternative, non-adrenergic pathways for activating thermogenesis.
• To evaluate pharmacological and non-pharmacological interventions targeting these pathways.
• To bridge the translational gap between rodent and human obesity research.

Main Methods:

• Comprehensive literature review of alternative thermogenic mechanisms.
• Analysis of G-protein coupled receptors (GPCRs), ion channels, and hormonal signaling.
• Evaluation of interventions including cold exposure, exercise, diet, and novel pharmacological agents.

Main Results:

• Non-adrenergic pathways (e.g., TGR5, GLP-1R, SERCA modulators) offer promising alternatives.
• UCP1-independent mechanisms and futile substrate cycles contribute to thermogenesis.
• Multimodal therapies combining adrenergic and non-adrenergic approaches show potential.

Conclusions:

• Non-adrenergic and UCP1-independent mechanisms are crucial for human thermogenesis.
• Integrating diverse therapeutic strategies is key for effective obesity management.
• Future research should focus on multimodal and tissue-specific approaches for sustainable EE.