Unknown,Transcriptomics,Genomics,Proteomics

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Tofu decreases serum lipid levels and modulates hepatic gene expression involved in lipid metabolism in rats

ABSTRACT: The effects of freeze-dried tofu, a traditional Japanese soy food, were compared with those of major active soy components, protein and isoflavone, by observing physiological differences and global transcriptomes in the liver of male rats. The GeneChip data was normalized and summarized by using SuperNORM data service (Skylight Biotech Inc.). Significance of expressional change among groups was tested by 2-way ANOVA on the normalized CEL data, which was deposited in a tab-separated ASCII text format. Principal components were identified on the summarized gene data. Rats were randomly divided into 6 groups of 5 samples and assigned experimental diets for 14 days. The experimental diets were as follows: casein diet (C); C containing isoflavone (CI) soy protein diet (S); S containing isoflavone (SI); a diet containing 100 g/kg each of protein derived from casein and freeze-dried tofu (T10); a diet containing 200 g/kg of protein derived from freeze-dried tofu (T20). CI and SI were supplemented with a mixture of isoflavones to match the isoflavone level of T20.

ORGANISM(S): Rattus norvegicus

SUBMITTER: Tomokazu Konishi

PROVIDER: E-GEOD-23748 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Beneficial effects of a soy diet on bone quality have been assumed to be due to the putative estrogenic actions of isoflavones. We studied the effects of soy protein isolate (SPI) on bone quality and compared these effects to 17Î²-estradiol (E2) in pre-pubertal rats. Female rats were weaned to a control diet with or without E2 (0.1, 1, 10 Âµg/kg/d), or SPI-containing diet with or without E2 (10 Âµg/kg/d) for 14 days beginning on postnatal day 20. In long bones from SPI-fed rats, only cancellous bone mineral density (BMD) was increased (p<0.05), while cortical BMD was decreased accompanied by lower bone strength compared to control casein-fed rats (p<0.05). In sharp contrast, 10 Âµg/kg/d E2 not only increased trabecular BMD, but also cortical BMD compared to controls. Rats treated with the combination of SPI and E2 had an intermediate bone effect. SPI increased while E2 decreased bone turnover, and increased trabecular BMD by both E2 and SPI was associated with decreased serum sclerostin levels. Microarray analysis revealed 652 genes regulated by SPI diet, 491 genes regulated by E2, and 266 genes regulated in common by both SPI diet and E2 compared to rats fed casein. The expression of caveolin-1, a protein localized in cell membrane, was down-regulated (p<0.05) in rats fed SPI, but not by E2 compared to rats fed casein. Down-regulated caveolin-1 by SPI was associated with increased BMP2, Smad and Runx2 expression in bone and osteoblasts (p<0.05). These results suggest SPI consumption results in significant non-classical estrogenic stimulation of cancellous bone formation prior to puberty, but may have adverse effects on overall bone quality and strength at this developmental stage as a result of reduced cortical bone formation. The study was designed to compare expression of bone development associated genes between soy protein isolate fed and estrogen treated pre pubertal female rats. Therefore, total RNA was isolated from bone from rats fed with control casein diet, SPI diet, 17 beta estrodial treated and SPI diet plus 17 beta estrodial.

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Tofu decreases serum lipid levels and modulates hepatic gene expression involved in lipid metabolism in rats

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