Frank Paul Mora

🧬🔥 What if omega-3 fatty acids could reprogram brown adipose tissue to release factors that kill cancer cells? A new study in Nutrition & Metabolism reveals that DHA-enriched omega-3 supplementation remodels adipose endocrine function and enhances brown adipose tissue (BAT) secretome-mediated melanoma cell death. 🔬 1. DHA reshapes systemic inflammation Female C57BL/6 mice received DHA-enriched omega-3 (DHA = 5:1; 1 g/kg/day) for 35 days. Supplementation reduced: • IL-1β: approximately threefold • IL-6 and TNF-α: approximately twofold • Oxidant-sensitive fluorescence in peritoneal lavage cells Body weight remained unchanged. 🧬 2. Adipose remodeling occurs without weight loss DHA-enriched supplementation reduced: • Gonadal WAT mass: ~50% • Subcutaneous WAT mass: ~40% • Gonadal adipocyte size BAT mass remained unchanged, but BAT TGF-β protein levels declined significantly. Classical thermogenic and lipolytic markers were largely unchanged. ⚡ 3. BAT secretome acquires enhanced antitumor activity Researchers collected conditioned media (CM) from BAT and subcutaneous WAT and exposed B16-F10 melanoma cells to these secretomes. BAT-CM from DHA-supplemented mice produced: • Increased Annexin V-positive melanoma cells • Greater total melanoma cell death • Approximately 40% reduction in MTT-assessed metabolic viability Importantly, BAT-CM preserved viability in nonmalignant NIH/3T3 fibroblasts under the tested conditions. 🔥 4. The effect is depot-specific Although both BAT- and WAT-derived CM reduced melanoma viability, DHA supplementation selectively enhanced BAT-CM cytotoxicity. BAT-CM also exhibited increased triglyceride concentrations. The specific cytotoxic lipid or secreted factor remains unidentified. 🔋 5. Adipose secretomes alter tumor inflammatory signaling Conditioned media from DHA-supplemented animals reduced melanoma-associated IL-6 production. TGF-β levels also shifted toward unstimulated control values. These observations suggest that adipose endocrine remodeling may influence tumor-associated inflammatory programs. 🎯 Therapeutic implications Dietary DHA → Adipose endocrine remodeling → Altered BAT secretome → Enhanced melanoma cell death in vitro This proposed adipose–tumor communication pathway offers a potential direction for metabolic cancer research. However, the study did not demonstrate tumor suppression in vivo, identify the responsible secreted mediators, or establish clinical anticancer efficacy. 💡 Key takeaway: Brown adipose tissue may influence cancer biology through its secretome independently of measurable changes in BAT mass or classical thermogenic markers. DHA supplementation provides a potential nutritional approach to modifying this endocrine communication. 📄 Santos da Silva D, Braz-de-Melo HA, Farias GR, et al. DHA-enriched omega-3 supplementation remodels adipose endocrine function and potentiates brown adipose secretome-mediated killing of melanoma cells. Nutrition & Metabolism (2026). Article in Press. DOI: doi.org/10.1186/s12986-026-0… #CancerMetabolism #BrownAdiposeTissue #DHA #Omega3 #Melanoma #AdiposeSecretome #Adipokines #TumorMicroenvironment #LipidMetabolism #Immunometabolism #MetabolicTherapy

🧬🔥 What if sympathetic nerves burn fat not only through norepinephrine—but by remodeling the extracellular matrix surrounding adipocytes? A new study in Nature Metabolism identifies GUSB-enriched sympathetic neurons as regulators of adipose thermogenesis, revealing an unexpected neuron–ECM–adipocyte signaling pathway. 🔬 1. A specialized sympathetic neuron population Single-cell RNA sequencing identified a neuronal subset enriched in β-glucuronidase (GUSB). Approximately 25% of TH⁺ sympathetic neurons expressed GUSB. Cold exposure selectively increased GUSB expression and neuronal activation. ⚡ 2. Sympathetic nerves remodel adipose ECM Cold-activated neurons release GUSB into adipose tissue. GUSB processes extracellular glycosaminoglycans, increasing bioavailable chondroitin sulfate (CS). Cold → GUSB⁺ sympathetic neurons → Extracellular GUSB → ECM remodeling → CS release Remarkably, this mechanism operates alongside classical norepinephrine signaling. 🧬 3. CS activates adipocyte thermogenesis through CD97 CS stimulates the adhesion GPCR CD97 (ADGRE5) on adipocytes. CS → CD97 → PKA/CREB/HSL signaling → UCP1 ↑ → Thermogenic recruitment ↑ Adipocyte-specific CD97 deletion abolished CS-induced increases in oxygen consumption and thermogenic gene expression. 🔋 4. Genetic evidence establishes neuronal dependency Sympathetic neuron-specific GUSB deletion reduced cold-induced UCP1 expression and oxygen consumption. Recombinant GUSB or CS supplementation restored thermogenic responses. In contrast, deleting GUSB from adipocytes, macrophages, fibroblasts, or endothelial cells did not reproduce this phenotype. 🔥 5. The pathway protects against diet-induced obesity GUSB-deficient mice developed greater weight gain, glucose intolerance, insulin resistance, and impaired thermogenesis during high-fat feeding. Intravenous CS administration (20 mg/kg every three days for eight weeks): • Reduced weight gain and adiposity • Improved glucose homeostasis • Increased oxygen consumption • Enhanced UCP1 expression These benefits were substantially weakened by adipocyte CD97 deletion. 🧪 6. Human genetics suggests translational relevance Obesity-associated GUSB promoter variants were identified. KLF15 regulated GUSB transcription, whereas promoter variation disrupted KLF15-dependent activation in reporter assays. However, human neuronal thermogenic mechanisms were not directly demonstrated. 🎯 Therapeutic implications The GUSB–CS–CD97 axis represents a potential target for obesity and metabolic dysfunction. Unlike conventional β-adrenergic approaches, it connects neural activity with extracellular matrix remodeling. Nevertheless, evidence remains predominantly from male mice. Systemic CS may exert additional metabolic effects, and human efficacy and safety remain unestablished. 💡 Key takeaway: Adipose ECM is not merely structural scaffolding. Sympathetic neurons can enzymatically transform it into a source of bioactive signals that activate thermogenesis and influence whole-body metabolism. 📄 Wang X, Zhu X, Jiang J, et al. GUSB-enriched sympathetic neurons promote thermogenic recruitment through extracellular matrix remodelling in male mice. Nature Metabolism (2026). DOI: doi.org/10.1038/s42255-026-0… Datasets: GSE347005 | PRJNA1526455 #AdiposeTissue #Thermogenesis #GUSB #CD97 #ChondroitinSulfate #ExtracellularMatrix #SympatheticNeurons #Obesity #BrownFat #BeigeFat #MetabolicHealth #DrugDiscovery