Single-cell Raman imaging reveals fructose impairs brown adipocyte differentiation

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

• Level A · Stronger Clinical Evidence
• Level B · Emerging clinical evidence with positive signals
• Level C · Early human research exploring benefits
• Level D · Scientific groundwork from lab and animal studies
• Emerging · Emerging topic under active research

Abstract (original English)

Brown adipose tissue (BAT) plays a pivotal role in energy expenditure and metabolic health, yet the influence of specific sugars like fructose on brown adipocyte development remains poorly understood. Here, we employ high-speed line-illumination Raman imaging, combined with machine learning, to investigate how varying sugar environments - fructose, glucose, or both - impact the differentiation of human brown preadipocytes (HBPs). This label-free, non-destructive method provides spatially-resolved insight into lipid content, composition, and subcellular distribution during adipogenesis. Quantitative ratiometric analysis of Raman spectra reveals that fructose exposure leads to higher lipid unsaturation and esterification, indicative of impaired differentiation. Trajectory inference and unsupervised clustering further identify distinct subpopulations of adipocytes, demonstrating that fructose-treated cells exhibit phenotypes associated with early differentiation stages. Together, our findings reveal a negative regulatory role of fructose in brown adipocyte maturation and highlight Raman imaging as a powerful tool for dissecting metabolic cell states under variable nutrient conditions.

Evidence level

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

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