Soybean protein suppresses hepatic lipogenic enzyme gene expression in Wistar fatty rats.
The effects of dietary soybean protein on lipogenic enzyme gene expression in livers of genetically fatty rats (Wistar fatty) have been investigated. When Wistar fatty rats and their lean littermates (7-8-wk old) were fed a casein or soybean protein isolate diet containing hydrogenated fat (4% hydrogenated fat plus 1% corn oil) or corn oil (5%) for 3 wk, the hepatic messenger RNA concentrations and activities of lipogenic enzymes were significantly lower in rats fed soybean protein than in those fed casein, regardless of genotype or dietary fat. The conversion rates of thyroxine to triiodothyronine by liver microsomes and plasma triiodothyronine concentrations were lower in the fatty rats than in the lean rats and were significantly greater in rats fed soybean protein than in those fed casein. Conversely, plasma and liver triacylglycerol concentrations were lower in soybean protein-fed fatty and lean rats than in those fed casein. The body weight was less in the fatty rats fed soybean protein than in those fed casein after 3 wk of feeding. Moreover, dietary polyunsaturated fatty acids suppressed lipogenic enzyme gene expression in the lean rats but did not in the fatty rats. Dietary soybean protein appeared to be useful for the reduction of obesity.
Iritani
N
N
Tezukayama Gakuin College, Osaka, Japan.
Hosomi
H
H
Fukuda
H
H
Tada
K
K
Ikeda
H
H
D001275:ATP Citrate (pro-S)-Lyase / Q000032:analysis / Q000235:genetics* / Q000378:metabolism; D000103:Acetyl-CoA Carboxylase / Q000032:analysis / Q000235:genetics* / Q000378:metabolism; D000818:Animals; D001835:Body Weight / Q000187:drug effects / Q000502:physiology; D004041:Dietary Fats / Q000494:pharmacology; D004044:Dietary Proteins / Q000494:pharmacology; D004435:Eating / Q000187:drug effects / Q000502:physiology; D064429:Fatty Acid Synthases / Q000032:analysis / Q000235:genetics* / Q000378:metabolism; D005227:Fatty Acids / Q000378:metabolism; D005260:Female; D015971:Gene Expression Regulation, Enzymologic; D005838:Genotype; D005954:Glucosephosphate Dehydrogenase / Q000032:analysis / Q000235:genetics* / Q000378:metabolism; D008066:Lipolysis / Q000502:physiology; D008099:Liver / Q000737:chemistry / Q000201:enzymology* / Q000378:metabolism; D008862:Microsomes, Liver / Q000378:metabolism; D014674:Plant Proteins, Dietary / Q000494:pharmacology*; D012333:RNA, Messenger / Q000032:analysis / Q000235:genetics / Q000378:metabolism; D051381:Rats; D011922:Rats, Mutant Strains; D017208:Rats, Wistar; D030262:Soybean Proteins; D013025:Glycine max; D013974:Thyroxine / Q000378:metabolism; D014280:Triglycerides / Q000378:metabolism; D014284:Triiodothyronine / Q000378:metabolism
D004041:Dietary Fats; D004044:Dietary Proteins; D005227:Fatty Acids; D014674:Plant Proteins, Dietary; D012333:RNA, Messenger; D030262:Soybean Proteins; D014280:Triglycerides; D014284:Triiodothyronine; D005954:Glucosephosphate Dehydrogenase; D064429:Fatty Acid Synthases; D001275:ATP Citrate (pro-S)-Lyase; D000103:Acetyl-CoA Carboxylase; D013974:Thyroxine