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Hedi Raizer

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What does the research say about UCP1?

UCP1 is the defining marker of brown and beige adipocytes. Here we summarise the evidence on its regulation, from animal and in vitro models, and the pathways that converge on thermogenic gene programmes.

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Uncoupling protein 1 (UCP1), also known as thermogenin, is a mitochondrial inner membrane protein belonging to the mitochondrial anion carrier family. In humans it is encoded by the UCP1 gene. The protein functions as a proton translocator, dissipating the proton gradient across the inner mitochondrial membrane to generate heat — a process termed non-shivering thermogenesis. UCP1 is expressed almost exclusively in brown adipose tissue (BAT) and in beige (brite) adipocytes that arise in white adipose tissue (WAT) depots following cold exposure or β-adrenergic stimulation. Its activity is regulated by purine nucleotides and free fatty acids, and its abundance is a widely used marker of thermogenic capacity in adipose tissue.

Research on UCP1 centres on the adrenergic receptor signalling axis and the downstream transcriptional regulators of the thermogenic programme, including PGC-1α and the PRDM16 complex, which coordinate mitochondrial biogenesis and uncoupling.

Research Studies

Follistatin and adipose browning in atherosclerosis models

Follistatin (FST) binds and neutralises members of the transforming growth factor-beta (TGF-β) superfamily, influencing skeletal muscle, adipose and bone homeostasis. In a study using the Hybrid Mouse Diversity Panel, Fst expression was negatively correlated with aortic lesion area, and FST was reported to promote adipose browning and improve plasma lipid profiles in mice [1]. Transcriptomic and metabolomic analyses linked these effects to arginine metabolism. The findings are animal-based and do not establish causality in humans.

GDF-11 and cold-induced browning in mice

Growth differentiation factor 11 (GDF-11), a circulating TGF-β superfamily member, was investigated for its role in white adipose tissue plasticity. In mice exposed to cold, GDF-11 expression and SMAD2/3 activation were assessed in brown adipose tissue, visceral and subcutaneous white adipose tissue, and skeletal muscle. The study combined in vivo results with in vitro approaches using 3T3-L1 cells [2]. The work supports a role for GDF-11 in cold-induced browning, but the evidence is confined to rodent and cell-culture models.

Finerenone and epicardial adipose tissue in atrial fibrillation

Finerenone, a nonsteroidal mineralocorticoid receptor antagonist, is being tested in a pilot trial for reducing atrial fibrillation recurrence after catheter ablation. Preclinical studies suggest it may promote browning of adipose tissue and improve epicardial adipose tissue characteristics [3]. The trial is ongoing and will enrol 40 patients; no results on UCP1 or browning endpoints are yet available. This is a clinical study but does not directly measure UCP1.

Exercise and diet effects on adipose tissue in metabolic syndrome

A clinical study is examining whether physical exercise and/or a Mediterranean diet can preserve adipose tissue functionality and retard skeletal muscle ageing in middle-aged volunteers with metabolic syndrome. The study assesses mitochondrial biogenesis and reactive oxygen species accumulation, pathways homologous to caloric restriction [4]. UCP1 is not a primary endpoint, but the trial addresses thermogenic and mitochondrial adaptations in human adipose tissue.

Syringaresinol and the skeletal muscle SIRT1-FNDC5/irisin axis

Syringaresinol (SYR), a plant-derived lignan, was studied for its effects on SIRT1-related FNDC5/Irisin signalling and high-fat diet-associated metabolic outcomes. Differentiated C2C12 myotubes were treated with SYR, the SIRT1 activator SRT1720, and the SIRT1 inhibitor EX-527 to assess irisin regulation [5]. This work is in vitro and does not directly address UCP1, though irisin has been proposed to influence adipose thermogenesis.

Time-restricted feeding and HIIT in diabetic rats

A study in diabetic rats evaluated the independent and combined effects of time-restricted feeding (TRF) and high-intensity interval training (HIIT) on thermogenesis-related protein abundance in white adipose tissue. Forty male Wistar rats were divided into normal and diabetic groups [6]. The findings are animal-only and focus on thermogenic markers, which may include UCP1, but the evidence is not yet translated to humans.

β2-adrenergic receptor stimulation and human beige adipocytes

β-Adrenergic receptors drive beige adipocyte induction in rodents and humans, but the dominant human subtype — β2-AR or β3-AR — remains debated. A study using human adipose-derived mesenchymal stem cells (hADSCs) aimed to confirm whether hADSC-derived adipocytes can serve as a beiging-competent model under human-relevant conditions [7]. This is an in vitro human cell model and provides mechanistic insight into UCP1 regulation.

Bombesin receptor-activated protein homolog and metabolic dysfunction

Bombesin receptor-activated protein (BRAP) and its mouse homolog BC004004 are expressed in the central nervous system. In feeding experiments, BRAP homolog knockout mice (BC004004-/-) showed reduced preference for a high-fat diet and alleviated metabolic dysfunction [8]. This study is animal-based and does not directly measure UCP1, but it links central signalling to energy balance.

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