Regulation of lipoprotein lipase synthesis in 3T3-L1 adipocytes by interleukin-11/adipogenesis inhibitory factor.
Interleukin-11/adipogenesis inhibitory factor (IL-11/AGIF) inhibits adipogenesis and suppresses lipoprotein lipase (EC3.1.1.34, LPL) activity in adipocytes (1,2). We investigated the mechanism of suppression of LPL activity in 3T3-L1 adipocytes by IL-11/AGIF. Incubation of adipocytes with 50 ng/ml of IL-11/AGIF led to a 75% decrease in LPL activity within 8 hours, whereas LPL mRNA level decreased by less than 30%. The LPL synthesis, as judged by the incorporation of 35S-label into immunoprecipitable LPL, decreased at almost the same rate over the same time period as enzyme activity. The degradation rate was not significantly affected by IL-11/AGIF. These data suggest that regulation of the synthesis of the enzyme protein is at least one of the main steps in the suppression of LPL by IL-11/AGIF in 3T3-L1 adipocytes.
Biomedical Laboratories, Sankyo Co., Ltd., Tokyo, Japan.
J
J
Ohsumi
K
K
Miyadai
I
I
Kawashima
S
S
Sakakibara
J
J
Yamaguchi
Y
Y
Itoh
D016475:3T3 Cells; D017667:Adipocytes / Q000166:cytology / Q000187:drug effects / Q000201:enzymology*; D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D015870:Gene Expression / Q000187:drug effects; D017370:Interleukin-11 / Q000494:pharmacology*; D007700:Kinetics; D008071:Lipoprotein Lipase / Q000096:biosynthesis*; D008715:Methionine / Q000378:metabolism; D051379:Mice; D012333:RNA, Messenger / Q000096:biosynthesis; D013997:Time Factors
D017370:Interleukin-11; D012333:RNA, Messenger; D008715:Methionine; D008071:Lipoprotein Lipase