title: Baicalein inhibits lipid accumulation by regulating early adipogenesis and m-TOR signaling.
abstract: Baicalein is a type of flavonoid that originates from Scutellaria baicalensis. In this study, we examined how baicalein inhibits lipid accumulation during adipogenesis in 3T3-L1 cells. Our data show that baicalein inhibited lipid accumulation during adipogenesis in a dose-dependent manner. Baicalein inhibition was limited to the early adipogenic stage. Cell cycle analysis showed that baicalein induced cell cycle arrest in the G0/G1 phase through cyclin downregulation. In addition, baicalein suppressed the mRNA expression of early adipogenic factors leading to downregulation of late adipogenic factors at mRNA and protein levels. Inhibition of adipogenic factors by baicalein was correlated with downregulation of lipid synthetic enzymes. Additionally, baicalein negatively regulated the m-TOR signaling pathway involved in lipid accumulation during adipogenesis, thus inhibiting phosphorylation of m-TOR and p70S6K. In a zebrafish study, baicalein significantly reduced lipid accumulation in Nile Red staining. Consistent with a report using cell lines, mRNA expression of adipogenic factors was decreased in a dose-dependent manner by baicalein. This result reflects a reduction in total triglyceride levels based on a triglyceride assay. Our data suggest that baicalein inhibits lipid accumulation by controlling the cell cycle and m-TOR signaling in 3T3-L1 cells, and its anti-adipogenic effect was found in a zebrafish model.
authors.affiliation: Department of Food Science and Biotechnology, CHA University, Kyonggi 463-836, South Korea.
authors.forename: Min-Jung
authors.initials: MJ
authors.lastname: Seo
authors.affiliation: Department of Food Science and Biotechnology, CHA University, Kyonggi 463-836, South Korea.
authors.forename: Hyeon-Son
authors.initials: HS
authors.lastname: Choi
authors.affiliation: Department of Food Science and Biotechnology, CHA University, Kyonggi 463-836, South Korea.
authors.forename: Hui-Jeon
authors.initials: HJ
authors.lastname: Jeon
authors.affiliation: Department of Food Science and Biotechnology, CHA University, Kyonggi 463-836, South Korea.
authors.forename: Mi-Seon
authors.initials: MS
authors.lastname: Woo
authors.affiliation: Department of Food Science and Biotechnology, CHA University, Kyonggi 463-836, South Korea. Electronic address: bylee@cha.ac.kr.
authors.forename: Boo-Yong
authors.initials: BY
authors.lastname: Lee
mesh_terms: D050156:Adipogenesis; D001483:Base Sequence; D017931:DNA Primers; D044950:Flavanones / Q000494:pharmacology*; D050356:Lipid Metabolism; D015398:Signal Transduction; D058570:TOR Serine-Threonine Kinases / Q000378:metabolism*
chemical_list: D017931:DNA Primers; D044950:Flavanones; C006680:baicalein; C546842:MTOR protein, human; D058570:TOR Serine-Threonine Kinases
keywords: 3T3-L1; Adipogenesis; Mitotic clonal expansion; Triglyceride signaling pathway; Zebrafish; m-TOR signaling pathway