Blueberry compound reduces muscle fat by stabilizing PPARδ — SkimNews
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- Shinshu University researchers led by Associate Professor Takakazu Mitani identified pterostilbene as a natural compound that reduced abnormal fat buildup in cultured C2C12 mouse skeletal muscle cells without interfering with normal muscle development.
- Pterostilbene worked not by blocking fatty acid entry into cells but by increasing glycerol release and boosting expression of genes involved in fatty acid oxidation, signaling that stored fat was being broken down for energy.
- Pterostilbene stabilized the PPARδ protein by slowing its degradation through the ubiquitin-proteasome pathway, increasing the protein's availability and boosting transcription of lipid metabolism genes — a mechanism distinct from compounds that directly bind and activate PPARδ.
- The findings were published on September 1, 2026 in Volume 83 of the Food Bioscience journal (DOI: 10.1016/j.fbio.2026.109519) and specifically addressed myosteatosis, a condition for which Mitani said there are currently no approved treatments.
- The research is limited to molecular experiments in cultured mouse muscle cells and does not yet demonstrate effectiveness in animals or humans; Mitani called it a framework for identifying other natural compounds that stabilize PPARδ and for developing functional foods targeting muscle fat metabolism.
Why it matters: The study points to a dietary ingredient candidate for a metabolic condition — excess fat inside skeletal muscle linked to insulin resistance — that has no approved treatments. Because pterostilbene works through protein stabilization rather than direct receptor activation, researchers say it offers a new screening framework for food-derived compounds targeting PPARδ, though animal and human trials are still required.
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