Inhibitory effect of galanolactone isolated from Zingiber officinale roscoe extract on adipogenesis in 3T3-L1 cells

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Abstract

Zingiber officinale Roscoe commonly known as ginger, has been used in traditional medicine. Inhibtion effect of galanolactone isolated from Z. officinale Roscoe on adipogenesis in 3T3-L1 cells was evaluated. Effect of galanolactone on 3T3-L1 adipocyte differentiation was measured by Oil Red O staining, and cytotoxicity effect of galanolactone was analyzed by 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide assay. The expression of various genes involved in adipogenic action of galanolactone was determined by real-time PCR and Western blot. Peroxisome proliferator-activated receptor γ (PPARγ) luciferase transactivation assay was used to evaluate the PPARγ transcriptional activity of galanolactone in HEK 293T cells. Galanolactone inhibited lipid accumulation and expression of adipocyte fatty acid-binding protein (aP2) and resistin in a dose-dependent manner in 3T3-L1 cells. Treatment with 50 and 100 μM of galanolactone significantly decreased the troglitazone-induced PPARγ transcripitional activity in HEK 293T cells, and suppressed expressions of PPARγ and CCAAT-enhancer-binding protein α (C/EBPα) at mRNA and protein levels in 3T3-L1 cells. These findings suggest that galanolactone isolated from Z. officinale Roscoe exerts anti-obesity effect through downregulation of adipogenic transcription factors and adipogenic marker genes.

Keywords

adipogenesis adipogenic marker genes galanolactone peroxisome proliferator-activated receptor γ 3T3-L1 cells Zingiber officinale 

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Copyright information

© The Korean Society for Applied Biological Chemistry 2012

Authors and Affiliations

  1. 1.Natural Products Research InstituteGyeonggi Institute of Science & Technology PromotionGyeonggi-doRepublic of Korea
  2. 2.College of PharmacyDankook UniversityCheonan-siRepublic of Korea

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