Fueling or Fighting Cancer? The Thermogenic Paradox of Brown Adipose Tissue

TL;DR

Brown fat can both protect against and worsen cancer, depending on the context, highlighting its complex role in metabolism and disease.

Contribution

This review introduces the 'thermogenic paradox' of brown adipose tissue in cancer, revealing its dual role in protection and progression.

Findings

Adaptive browning reduces metabolic inflammation and may suppress tumors.

Tumor-induced thermogenesis contributes to cancer cachexia via UCP1 and β3-adrenergic signaling.

BAT's effects on cancer depend on regulatory pathways and context.

Abstract

The global rise in obesity and metabolic syndrome has intensified interest in brown adipose tissue (BAT) as a regulator of energy metabolism and potential modulator of cancer risk. BAT-mediated thermogenesis and the browning of white adipose tissue (WAT) confer metabolic benefits that may reduce oncogenic susceptibility. However, emerging evidence reveals a paradoxical role for BAT in cancer progression, where tumor-induced thermogenic activation contributes to cancer-associated cachexia (CAC). This review article examines the cellular, molecular, and translational dimensions of this “thermogenic paradox”.

A narrative synthesis was performed using literature from 2000 to 2025 retrieved from PubMed, Scopus, Web of Science, and Google Scholar. Peer-reviewed studies examining the molecular, genetic, and metabolic mechanisms linking BAT or adipose browning to carcinogenesis, obesity-related cancers, and CAC were included. Thematic integration emphasized regulatory pathways, endocrine signaling, and therapeutic implications. Adaptive browning, regulated by transcriptional drivers such as PRDM16, PPARγ, and PGC1-α, mitigates metabolic inflammation, enhances insulin sensitivity, and may exert tumor-suppressive effects. In contrast, tumor-secreted factors including parathyroid hormone-related protein (PTHrP) and interleukin-6 aberrantly induce uncoupling protein 1 (UCP1) expression and β3-adrenergic signaling, driving lipolysis and energy wasting in CAC. The dualistic effects of BAT underscore its context-dependent influence on cancer biology.

BAT exemplifies a metabolic continuum between protection and pathology. Clarifying its regulatory mechanisms may inform precision therapies and integrated metabolic-oncology interventions, particularly relevant to low- and middle-income countries facing the double burden of obesity and cachexia.

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