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Erschienen in: European Journal of Nutrition 1/2007

01.02.2007 | ORIGINAL CONTRIBUTION

Long-term consumption of fermented soybean-derived Chungkookjang enhances insulinotropic action unlike soybeans in 90% pancreatectomized diabetic rats

verfasst von: Dae Young Kwon, Jin Sun Jang, Sang Mee Hong, Ji Eun Lee, So Ra Sung, Hye Ryeo Park, Sunmin Park, PhD

Erschienen in: European Journal of Nutrition | Ausgabe 1/2007

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Abstract

Background

We previously reported that Chungkookjang (CKJ), fermented unsalted soybeans, exhibited better anti-diabetic action than cooked soybeans (CSB) in vitro, but its effectiveness and mechanism have not been studied in vivo.

Aim of the study

We investigated whether CKJ modulated insulin resistance, insulin secretion, and pancreatic β-cell growth and survival in 90% pancreatectomized (Px) diabetic rats.

Methods

The Px rats weighing 201 ± 12 g were divided into four groups and fed for 8 weeks with a CSB diet, a CKJ diet, a casein diet, or a casein diet plus rosiglitazone (20 mg/kg body weight/day). With the exception of protein sources and contents of isoflavonoid aglycones and glycosides, the composition of the diets was made identical by adding soybean oil and cellulose to a casein diet. At the end of the experimental periods, hyperglycemic clamp was performed in conscious, unstressed and overnight fasted Px rats to measure insulin secretion capacity. Insulin/IGF-1 signaling was measured by immunoblotting in isolated islets from the treated rats, and β-cell mass, proliferation and apoptosis were also determined by immunohistochemistry.

Results

After 8-week administration, CSB did not modulate glucose-stimulated insulin secretion, but surprisingly, CKJ enhanced insulin secretion. In addition, CKJ potentiated insulin/IGF-1 signaling in islets via the induction of insulin receptor substrate-2 expression, leading to increasing pancreatic duodenal homeobox-1, insulin promoter transcription factor. In parallel with the enhancement of the signaling, CKJ elevated pancreatic β-cell hyperplasia by increasing its proliferation and decreasing apoptosis, whereas CSB did not.

Conclusion

Based on these results, the fermentation of soybeans predominantly with Bacillus subtilis generated isoflavonoid aglycones and small peptides, which improved insulinotropic action in islets of type 2 diabetic rats. Overall, the anti-diabetic action of CKJ was superior to CSB in type 2 diabetic rats.
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Metadaten
Titel
Long-term consumption of fermented soybean-derived Chungkookjang enhances insulinotropic action unlike soybeans in 90% pancreatectomized diabetic rats
verfasst von
Dae Young Kwon
Jin Sun Jang
Sang Mee Hong
Ji Eun Lee
So Ra Sung
Hye Ryeo Park
Sunmin Park, PhD
Publikationsdatum
01.02.2007
Erschienen in
European Journal of Nutrition / Ausgabe 1/2007
Print ISSN: 1436-6207
Elektronische ISSN: 1436-6215
DOI
https://doi.org/10.1007/s00394-006-0630-y

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