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KMID : 0620720200260030230
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Natural Product Sciences
2020 Volume.26 No. 3 p.230 ~ p.235
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Anti-adipogenic Pregnane Steroid from a Hydractinia-associated Fungus, Cladosporium sphaerospermum SW67
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Lee Seoung-Rak
Kang Hee-Sun
Yoo Min-Jeong
Yi Sang-Ah
Beemelmanns Christine
Lee Jae-Cheol
Kim Ki-Hyun
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Abstract
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A pregnane steroid, 3α-hydroxy-pregn-7-ene-6,20-dione (1), was isolated from a Hydractiniaassociated Cladosporium sphaerospermum SW67 by repetitive column chromatographic separation and highperformance liquid chromatography (HPLC) purification. The planar structure of 1 was elucidated from the analysis of the spectroscopic data (1D and 2D NMR spectra) and LC-MS data. The absolute configuration of 1 was determined by interpretation of ROESY spectrum of 1, together with the comparison of reported spectroscopic values in previous studies. To the best of our knowledge, this is the first report of the identification of the pregnane scaffold from C. sphaerospermum, a natural source. Compound 1 was evaluated for its effects on lipid metabolism and adipogenesis during adipocyte maturation and showed that compound 1 substantially inhibited lipid accumulation compared to the control. Consistently, the expression of the adipocyte marker gene (Adipsin) was reduced upon incubation with 1. Further, we evaluated the effects of 1 on lipid metabolism by measuring the transcription of lipolytic and lipogenic genes. The expression of the lipolytic gene ATGL was significantly elevated upon exposure to 1 during adipogenesis, whereas the expression of lipogenic genes FASN and SREBP1 was significantly reduced upon treatment with 1. Thus, our findings provide experimental evidence that the steroid derived from Hydractinia-associated C. sphaerospermum SW67 is a potential therapeutic agent for obesity.
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KEYWORD
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Cladosporium sphaerospermum, Hydractinia-associated fungus, pregnane steroid, 3T3-L1 preadipocytes
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