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Polyhydroxylated Macrolides from Seimatosporium discosioides and Their Effects on the Activation of Peroxisome Proliferator-Activated Receptor Gamma

Hiep, Nguyen Tuan, Choi, Yun-hyeok, Kim, Nahyun, Hong, Seong Su, Hong, Seung-Beom, Hwang, Bang Yeon, Lee, Hak-Ju, Lee, Sung-Joon, Jang, Dae Sik, Lee, Dongho
Journal of natural products 2012 v.75 no.4 pp. 784-788
agonists, culture media, diabetes, ethyl acetate, genes, glucose-6-phosphatase, hepatocytes, macrolides, median effective concentration, nuclear magnetic resonance spectroscopy, peroxisome proliferator-activated receptors, spectral analysis
Two new polyhydroxylated macrolides, seimatopolides A (1) and B (2), were isolated from an EtOAc extract of Seimatosporium discosioides culture medium. The structures of the new compounds were established on the basis of spectroscopic analysis, including 1D and 2D NMR, and their absolute configurations were determined using the modified Mosher’s method. Seimatopolides A (1) and B (2) activated peroxisome proliferator-activated receptor (PPAR)-γ with EC₅₀ values of 1.15 and 11.05 μM, respectively. The expression of PPAR-γ target genes in HepG2 hepatocytes was significantly altered; in particular, expression of the gluconeogenic genes glucose-6-phosphatase (G6Pase) and phosphoenolpyruvate carboxykinase (PEPCK) was reduced upon stimulation with 1, supporting the proposal that compound 1 is both a PPAR-γ agonist and a possible therapeutic candidate for treatment of diabetes.