Precision Brain Lesioning Sheds New Light on How the Circadian Clock Controls Metabolism

A recent study “The suprachiasmatic nucleus regulates brown fat thermogenesis in male mice through an adrenergic receptor ADRB3-S100B signaling pathway” (Zeng et al. 2025) in PLOS Biology reveals a previously unknown mechanism through which the brain’s master clock, the suprachiasmatic nucleus (SCN), regulates thermogenesis and energy balance.

Read the open access paper: https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.3003534

At the core of this discovery is the Lesion Making Device (SKU 53500) by Ugo Basile, which enabled researchers to selectively disrupt the SCN with the precision required to uncover this brain-metabolism connection.

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The SCN is tin, just a few hundred microns across, yet it orchestrates daily rhythms in temperature, hormone release and energy use. Understanding how it communicates with peripheral organs like brown adipose tissue (BAT) has been a major question in circadian biology.

To answer it, scientists at Soochow University needed extremely accurate lesioning to isolate the SCN’s role without damaging surrounding structures. That precision was essential.

Using the Lesion Making Device by Ugo Basile, the team created highly controlled SCN lesions by delivering 0.4 mA for 30 seconds through a stereotaxically placed platinum–iridium electrode.

Methodology

Using the Lesion Making Device by Ugo Basile, the team created highly controlled SCN lesions. Mice were fixed in a stereotaxic apparatus and a 0.5 mm burr hole was drilled into the skull. A 0.15 mm platinum–iridium electrode (polyimide-coated except at the tip) was lowered to precise stereotaxic coordinates (AP: −0.05 mm, ML: ±0.15 mm, DV: −5.85 mm from bregma), and a direct current of 0.4 mA was applied for 30 seconds. Sham-operated animals underwent identical surgery but without current delivery, providing a clean internal control.

This approach enabled:

• Sub-millimeter accuracy in a very delicate area
• Reproducible lesions across animals
• Clean experimental models for physiological and molecular analysis

Key Findings

SCN-lesioned mice showed:

• Loss of metabolic flexibility: they could no longer switch from glucose to fat during fasting
• Persistent thermogenesis: BAT kept generating heat even without access to fat
• Activation of an ADRB3–S100B signaling axis: S100B drove brown fat proliferation and protected cells from senescence

These findings reveal a surprising inhibitory role of the SCN over BAT thermogenesis, reshaping our understanding of how circadian timing influences metabolism.

Convergent Evidence

What makes this study particularly compelling is that similar results emerged from:

• Electrolytic SCN lesions (Ugo Basile)
  • Constant light exposure
  • NMDA-induced excitotoxicity
  • Targeted viral ablation

Such convergent evidence underscores the specificity and reliability of the lesioning method.

Translational Implications

Circadian disruption, from shift work to irregular sleep, contributes to obesity and metabolic disease. This research provides a mechanistic explanation:

When circadian control weakens, tissues lose the ability to match fuel use to need.

Targeting the ADRB3–S100B axis may offer new therapeutic strategies to restore metabolic balance.

This work demonstrates how precision instruments are fundamental to transformative scientific discoveries in neuroscience and metabolic research.

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