title: Development of a novel transgenic rice with hypocholesterolemic activity via high-level accumulation of the α' subunit of soybean β-conglycinin.
abstract: Soybean 7S globulin, known as β-conglycinin, has been shown to regulate human plasma cholesterol and triglyceride levels. Furthermore, the α' subunit of β-conglycinin has specifically been shown to possess low-density lipoprotein (LDL)-cholesterol-lowering activity. Therefore, accumulation of the α' subunit of β-conglycinin in rice seeds could lead to the production of new functional rice that could promote human health. Herein, we used the low-glutelin rice mutant 'Koshihikari' (var. a123) and suppressed its glutelins and prolamins, the major seed storage proteins of rice, by RNA interference. The accumulation levels of the α' subunit in the lines with suppressed glutelin and prolamin levels were >20 mg in 1 g of rice seeds, which is considerably higher than those in previous studies. Oral administration of the transgenic rice containing the α' subunit exhibited a hypocholesterolemic activity in rats; the serum total cholesterol and LDL cholesterol levels were significantly reduced when compared to those of the control rice (var. a123). The cholesterol-lowering action by transgenic rice accumulating the α' subunit induces a significant increase in fecal bile acid excretion and a tendency to increase in fecal cholesterol excretion. This is the first report that transgenic rice exhibits a hypocholesterolemic activity in rats in vivo by using the β-conglycinin α' subunit.
authors.affiliation: Laboratory of Food Quality Design and Development, Graduate School of Agriculture, Kyoto University, Uji, Kyoto, Japan.
authors.forename: Cerrone
authors.initials: C
authors.lastname: Cabanos
authors.forename: Naoki
authors.initials: N
authors.lastname: Kato
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Amari
authors.forename: Keigo
authors.initials: K
authors.lastname: Fujiwara
authors.forename: Tomoki
authors.initials: T
authors.lastname: Ohno
authors.forename: Kousuke
authors.initials: K
authors.lastname: Shimizu
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Goto
authors.forename: Masaya
authors.initials: M
authors.lastname: Shimada
authors.forename: Masaharu
authors.initials: M
authors.lastname: Kuroda
authors.forename: Taro
authors.initials: T
authors.lastname: Masuda
authors.forename: Fumio
authors.initials: F
authors.lastname: Takaiwa
authors.forename: Shigeru
authors.initials: S
authors.lastname: Utsumi
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nagaoka
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Maruyama
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000924:Anticholesteremic Agents / Q000378:metabolism*; D052179:Antigens, Plant / Q000008:administration & dosage* / Q000378:metabolism*; D015153:Blotting, Western; D002784:Cholesterol / Q000378:metabolism; D008078:Cholesterol, LDL / Q000378:metabolism; D002853:Chromatography, Liquid; D015180:Electrophoresis, Gel, Two-Dimensional; D005916:Globulins / Q000008:administration & dosage* / Q000378:metabolism*; D005983:Glutens / Q000378:metabolism; D006801:Humans; D008297:Male; D012275:Oryza / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D030821:Plants, Genetically Modified / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D055314:Seed Storage Proteins / Q000008:administration & dosage* / Q000378:metabolism*; D012639:Seeds / Q000737:chemistry / Q000378:metabolism; D030262:Soybean Proteins / Q000008:administration & dosage* / Q000378:metabolism*; D013025:Glycine max / Q000737:chemistry / Q000378:metabolism*; D053719:Tandem Mass Spectrometry
chemical_list: D000924:Anticholesteremic Agents; D052179:Antigens, Plant; D008078:Cholesterol, LDL; D005916:Globulins; C120054:GluB-1 protein, Oryza; D055314:Seed Storage Proteins; D030262:Soybean Proteins; C100565:alpha-conglycinin, Glycine max; C013894:beta-conglycinin protein, Glycine max; D005983:Glutens; D002784:Cholesterol