OBJECTIVE: Traditional Korean Chungtaejeon(CTJ) tea is a type of fermented tea, which has received increasing attention in recent years because of its purported health benefits. The present study was designed to investigate the effect and mechanism of CTJ tea extract on body weight gain using C57BL/6J-Lep ob/ob mice and 3T3-L1 adipocytes, respectively.METHODS: The effects of CTJ on cell viability, lipid accumulation, and expression of protein and mRNA were measured in 3T3-L1 adipocytes by using 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide, oil red O staining, Western blotting, and reverse transcriptase-polymerase chain reaction analyses. C57BL6J-Lep ob/ob mice were administered with CTJ(200 or 400 mg/kg body weight) for ten weeks. Then, body weight, food intake, total cholesterol, and triglyceride were measured in ob/ob mice.RESULTS: CTJ tea extract treated at 250 [jg/mL(CTJ250) significantly suppressed lipid accumulation in the differentiated 3T3-L1 adipocytes. Likewise, CTJ250 significantly decreased the protein expression of peroxisome proliferator-activated receptor y(PPARy), CCAAT/enhancer-binding protein a, and adipocyte lipid?binding protein, and regulated the mRNA expression of PPARy, sterol regulatory element-binding protein?ic gene, fatty acid synthase, adipocyte lipid-binding protein, hormone-sensitive lipase, carnitine palmitoyl transferase 1, cluster of differentiation 36, and acetyl-CoA carboxylase in the differentiated 3T3-L1 adipocytes.Mice administered with CTJ showed dose-dependent decrease in body weight gain, starting from week 4of the experiment. CTJ tea extract administered at 400 mg/kg body weight significantly decreased fat mass,food efficacy ratio, and levels of plasma triglyceride and total cholesterol.CONCLUSION: CTJ attenuated weight gain in ob/ob mice and regulated the activity of the molecules involved in adipogenesis and lipolysis in 3T3-L1 adipocytes. CTJ is a potentially valuable herbal therapy for the prevention of obesity and/or obesity-related disorders. OBJECTIVE: Traditional Korean Chungtaejeon (CTJ) tea is a type of fermented tea, which has received attention focused in recent years because of its purported health benefits. The present study was designed to investigate the effect and mechanism of CTJ tea extract on body weight gain using C57BL / 6J-Lep ob / ob mice and 3T3-L1 adipocytes, respectively. METHODS: The effects of CTJ on cell viability, lipid accumulation, and expression of protein and mRNA were measured in 3T3-L1 adipocytes by using 3- [4 , 5-dimethylthiazol-2-yl] -2,5-diphenyltetrazolium bromide, oil red O staining, Western blotting, and reverse transcriptase- polymerase chain reaction analyzes. C57BL6J-Lep ob / ob mice were administered with CTJ / kg body weight) for ten weeks. Then, body weight, food intake, total cholesterol, and triglyceride were measured in ob / ob mice .RESULTS: CTJ tea extract treated at 250 [jg / mL the differentiated 3T3-L1 adipocytes. Likewis e, CTJ250 significantly decreased the protein expression of peroxisome proliferator-activated receptor y (PPARy), CCAAT / enhancer-binding protein a, and adipocyte lipid? binding protein, and regulated the mRNA expression of PPARy, sterol regulatory element-binding protein gene, fatty acid synthase, adipocyte lipid-binding protein, hormone-sensitive lipase, carnitine palmitoyl transferase 1, cluster of differentiation 36, and acetyl-CoA carboxylase in the differentiated 3T3-L1 adipocytes. Mice administered with CTJ showed dose- body weight gain, starting from week 4 of the experiment. CTJ tea extract administered at 400 mg / kg body weight significantly decreased fat mass, food efficacy ratio, and levels of plasma triglyceride and total cholesterol. CONCLUSION: CTJ attenuated weight gain in ob / ob mice and regulated the activity of the molecules involved in adipogenesis and lipolysis in 3T3-L1 adipocytes. CTJ is a potentially valuable herbal therapy for the prevention of obesity and / or obesity-related disorders.