[논문]Silk and silkworm pupa peptides suppress adipogenesis in preadipocytes and fat accumulation in rats fed a high-fat diet

Lee, Sun Hee; Park, Dongsun; Yang, Goeun; Bae, Dae-Kwon; Yang, Yun-Hui; Kim, Tae Kyun; Kim, Dajeong; Kyung, Jangbeen; Yeon, Sungho; Koo, Kyo Chul; Lee, Jeong-Yong; Hwang, Seock-Yeon; Joo, Seong Soo; Kim, Yun-Bae

doi:10.1007/s00394-011-0280-6

[해외논문] Silk and silkworm pupa peptides suppress adipogenesis in preadipocytes and fat accumulation in rats fed a high-fat diet

European journal of nutrition, v.51 no.8, 2012년, pp.1011 - 1019

Lee, Sun Hee , Park, Dongsun , Yang, Goeun , Bae, Dae-Kwon , Yang, Yun-Hui , Kim, Tae Kyun , Kim, Dajeong , Kyung, Jangbeen , Yeon, Sungho , Koo, Kyo Chul , Lee, Jeong-Yong , Hwang, Seock-Yeon , Joo, Seong Soo , Kim, Yun-Bae

Abstract ▼ AI-Helper

The objective was to confirm the anti-obesity activity of a silk peptide (SP) and a silkworm pupa peptide (SPP) in rats fed a high-fat diet (HFD) and to elucidate their action mechanism(s) in a preadipocyte culture system. In an in vitro mechanistic study, the differentiation and maturation of 3T3-L1 preadipocytes were stimulated with insulin (5 mu g/mL), and effects of SP and SPP on the adipogenesis of mature adipocytes were assessed. In an in vivo anti-obesity study, male C57BL/6 mice were fed an HFD containing SP or SPP (0.3, 1.0, or 3.0%) for 8 weeks, and blood and tissue parameters of obesity were analyzed. Hormonal stimulation of preadipocytes led to a 50-70% increase in adipogenesis. Polymerase chain reaction and Western blot analyses revealed increases in adipogenesis-specific genes (leptin and Acrp30) and proteins (peroxisome proliferator-activated receptor-gamma and Acrp30). The hormone-induced adipogenesis and activated gene expression was substantially inhibited by treatment with SP and SPP (1-50 mu g/mL). The HFD markedly increased body weight gain by increasing the weight of epididymal and mesenteric fat. Body and fat weights were significantly reduced by SP and SPP, in which decreases in the area of abdominal adipose tissue and the size of epididymal adipocytes were confirmed by magnetic resonance imaging and microscopic examination, respectively. Long-term HFD caused hepatic lipid accumulation and increased blood triglycerides and cholesterol, in addition to their regulatory factors Acrp30 and leptin. However, SP and SPP recovered the concentrations of Acrp30 and leptin, and attenuated steatosis. SP and SPP inhibit the differentiation of preadipocytes and adipogenesis by modulating signal transduction pathways and improve HFD-induced obesity by reducing lipid accumulation and the size of adipocytes.

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