title: Polyamine metabolism is involved in adipogenesis of 3T3-L1 cells.
abstract: Polyamines spermidine and spermine are known to be required for mammalian cell proliferation and for embryonic development. Alpha-difluoromethylornithine (DFMO), an inhibitor of ornithine decarboxylase (ODC) a limiting enzyme of polyamine biosynthesis, depleted the cellular polyamines and prevented triglyceride accumulation and differentiation in 3T3-L1 cells. In this study, to explore the function of polyamines in adipogenesis, we examined the effect of polyamine biosynthesis inhibitors on adipocyte differentiation and lipid accumulation of 3T3-L1 cells. The spermidine synthase inhibitor trans-4-methylcyclohexylamine (MCHA) increased spermine/spermidine ratios, whereas the spermine synthase inhibitor N-(3-aminopropyl)-cyclohexylamine (APCHA) decreased the ratios in the cells. MCHA was found to decrease lipid accumulation and GPDH activity during differentiation, while APCHA increased lipid accumulation and GPDH activity indicating the enhancement of differentiation. The polyamine-acetylating enzyme, spermidine/spermine N(1)-acetyltransferase (SSAT) activity was increased within a few hours after stimulus for differentiation, and was found to be elevated by APCHA. In mature adipocytes APCHA decreased lipid accumulation while MCHA had the opposite effect. An acetylpolyamine oxidase and spermine oxidase inhibitor MDL72527 or an antioxidant N-acetylcysteine prevented the promoting effect of APCHA on adipogenesis. These results suggest that not only spermine/spermidine ratios but also polyamine catabolic enzyme activity may contribute to adipogenesis.
authors.affiliation: Laboratory of Biochemistry, Department of Pharmaceutical Sciences, Faculty of Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama, 350-0295, Japan.
authors.forename: Ikumi
authors.initials: I
authors.lastname: Ishii
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Ikeguchi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Mano
authors.forename: Masahiro
authors.initials: M
authors.lastname: Wada
authors.forename: Anthony E
authors.initials: AE
authors.lastname: Pegg
authors.forename: Akira
authors.initials: A
authors.lastname: Shirahata
mesh_terms: D041721:3T3-L1 Cells; D000111:Acetylcysteine / Q000494:pharmacology; D050156:Adipogenesis; D000818:Animals; D015317:Biogenic Polyamines / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D051379:Mice; D011700:Putrescine / Q000031:analogs & derivatives / Q000494:pharmacology
chemical_list: D015317:Biogenic Polyamines; C044445:MDL 72527; D011700:Putrescine; D000111:Acetylcysteine