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Salari Z, Ashabi G, Fartoosi A, Fartoosi A, Shariatpanahi M, Aghsami M, Montazeri H, Kheradmand A. Sericin alleviates motor dysfunction by modulating inflammation and TrkB/BDNF signaling pathway in the rotenone-induced Parkinson's disease model. BMC Pharmacol Toxicol 2023; 24:60. [PMID: 37936189 PMCID: PMC10631121 DOI: 10.1186/s40360-023-00703-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2023] [Accepted: 10/31/2023] [Indexed: 11/09/2023] Open
Abstract
BACKGROUND Parkinson's disease (PD) is a progressive neurodegenerative disorder characterized by the degeneration of nigrostriatal dopaminergic neurons and movement impairment. Based on theories, neuroinflammatory processes may be vital in the etiology of PD and other neurodegenerative diseases. Reports show that rotenone has neurotoxic, inflammatory, and motor impairment effects in PD. Sericin is a natural polymer with effective properties, such as neuroprotective and anti-inflammatory. Therefore, this study aimed to examine the effects of sericin administration on motor dysfunction by modulating inflammation and tyrosine kinase B/brain-derived neurotrophic factor (TrkB/BDNF) pathway in the rotenone-induced PD model. METHODS Wistar male rats (3-months-old) were treated with rotenone (2 mg/kg every 48 h for 30 days) to induce a rotenone-induced PD model. Also, sericin was administered orally at dose of 200 mg/kg every 48 h for 30 days. Rotarod and bar tests were performed for motor dysfunction. The protein levels of BDNF, c-fos, TrkB, tumor necrosis factor- α (TNF-α), interleukin-6 (IL-6) and catalase activity were evaluated in the striatum area. RESULTS Results showed that sericin increased latent time in the rotarod test and decreased the time staying on the pole in the bar test compared to the PD group (P < 0.001 for both tests). Moreover, sericin treatments decreased TNF-α (P < 0.001) and IL-6 (P < 0.001) concentration levels and enhanced the levels of BDNF (P < 0.001), c-fos (P < 0.001), TrkB (P < 0.001) proteins and catalase activity (P < 0.05) in the striatum area compared to the PD group. CONCLUSION These results support a protective benefit of sericin therapy in a rotenone-induced PD paradigm by reducing motor impairment, inflammatory response, and disruption of the TrkB/BDNF signaling pathway.
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Affiliation(s)
- Zahra Salari
- Department of Pharmacology and Toxicology, School of Pharmacy, Iran University of Medical Sciences, P.O. box: 1475886671, Tehran, Iran
| | - Ghorbangol Ashabi
- Department of Physiology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Ali Fartoosi
- Department of Pharmacology and Toxicology, School of Pharmacy, Iran University of Medical Sciences, P.O. box: 1475886671, Tehran, Iran
| | - Ahmad Fartoosi
- Department of Pharmacology and Toxicology, School of Pharmacy, Iran University of Medical Sciences, P.O. box: 1475886671, Tehran, Iran
| | - Marjan Shariatpanahi
- Department of Pharmacology and Toxicology, School of Pharmacy, Iran University of Medical Sciences, P.O. box: 1475886671, Tehran, Iran
| | - Mehdi Aghsami
- Department of Pharmacology and Toxicology, School of Pharmacy, Iran University of Medical Sciences, P.O. box: 1475886671, Tehran, Iran
| | - Hamed Montazeri
- Department of Pharmacognosy and Pharmaceutical Biotechnology, School of Pharmacy, Iran University of Medical Sciences, Tehran, Iran
| | - Afshin Kheradmand
- Department of Pharmacology and Toxicology, School of Pharmacy, Iran University of Medical Sciences, P.O. box: 1475886671, Tehran, Iran.
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Hassan E, Magdy S, Attaallah A, Gaber E, Mansour O, Gomaa RA, Odessy H, Augustyniak M, El-Samad LM, El Wakil A. Silk sericin alleviates aberrant photoperiod-induced alterations in testicular and adrenal steroidogenesis in adult mice. Reprod Biol Endocrinol 2022; 20:158. [PMID: 36401334 PMCID: PMC9673413 DOI: 10.1186/s12958-022-01032-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Accepted: 11/03/2022] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Steroidogenesis is a complex process of sequential enzymatic reactions affected by climate change. Animals respond to altered day length, the so-called photoperiod, with changes in physiology. The study aimed to an evaluation of sericin effect in alleviating steroidogenesis disorders induced by disturbed photoperiod in mice. METHODS The animals were randomly divided into three groups according to the lighting cycle: a control group with a standard 12Light:12Dark cycle, a short-term photoperiod group with a 6Light:18Dark cycle, and a long-term photoperiod group with an 18Light:6Dark cycle. Both short and long-term groups were subdivided into two equal subgroups: The placebo and the sericin-treated subgroups received, for five weeks from prepubertal throughout adulthood, one intraperitoneal injection per week of the solvent and 1 g sericin/kg body weight, respectively. RESULTS Selected oxidative stress parameters and testicular and adrenal steroidogenic capacities of adult mice were measured. After five weeks, the placebo group with impaired photoperiod showed a decrease in the quality and quantity of sperm and a reduction in testosterone, corticosterone, aldosterone, total antioxidant capacity, xanthine oxidase, and melatonin. At the same time, in these groups, there was an increase in the level of aromatase, malondialdehyde, cholesterol, and steroidogenic factor-1 (SF-1) expression in the adrenal cortex and an enhancement in histological lesions. Mice receiving sericin had parameters similar to the control group. CONCLUSION Our findings reveal that silk sericin can reduce the stress caused by photoperiod disorders regarding testicular function, sex hormone levels, and sperm quantity and quality. Thus, sericin is a biocompatible protein with a promising potential for its use in the case of organisms living under an abnormal photoperiod.
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Affiliation(s)
- Eman Hassan
- Department of Biological and Geological Sciences, Faculty of Education, Alexandria University, Alexandria, Egypt
| | - Shahinaz Magdy
- Department of Biological and Geological Sciences, Faculty of Education, Alexandria University, Alexandria, Egypt
| | - Amany Attaallah
- Department of Zoology, Faculty of Science, Damanhour University, Damanhour, Egypt
| | - Eman Gaber
- Department of Biological and Geological Sciences, Faculty of Education, Alexandria University, Alexandria, Egypt
| | - Omnia Mansour
- Department of Biological and Geological Sciences, Faculty of Education, Alexandria University, Alexandria, Egypt
| | - Rehab A Gomaa
- Department of Zoology, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Hala Odessy
- Department of Biological and Geological Sciences, Faculty of Education, Alexandria University, Alexandria, Egypt
| | - Maria Augustyniak
- Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Bankowa 9, 40-007, Katowice, Poland
| | - Lamia M El-Samad
- Department of Zoology, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Abeer El Wakil
- Department of Biological and Geological Sciences, Faculty of Education, Alexandria University, Alexandria, Egypt.
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Identification and Characterization of a Cocoon Degradable Enzyme from the Isolated Strain Bacillus subtilis Bs5C. BIOTECHNOL BIOPROC E 2020. [DOI: 10.1007/s12257-019-0399-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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The Combination of Mulberry Extracts and Silk Amino Acids Alleviated High Fat Diet-Induced Nonalcoholic Hepatic Steatosis by Improving Hepatic Insulin Signaling and Normalizing Gut Microbiome Dysbiosis in Rats. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2019; 2019:8063121. [PMID: 31275421 PMCID: PMC6582910 DOI: 10.1155/2019/8063121] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 04/16/2019] [Accepted: 05/16/2019] [Indexed: 12/13/2022]
Abstract
Mulberry water extracts (MB) and silk amino acids (SA) are reported to improve oxidative stress and inflammation, respectively. We hypothesized whether the mixture of mulberry water extracts and silk amino acids can alleviate nonalcoholic fatty liver disease (NAFLD) induced by high fat diets. Male Sprague Dawley rats were orally provided with high fat diets containing different ratios of MB and SA (1:3, MS1:3, or 1:5, MS1:5) or cellulose (the disease-control) for 12 weeks. Rats had 200 or 600 mg/kg bw of MS1:3 and MS1:5 (MS1:3-L, MS1:3-H; MS1:5-L, and MS1:5-H). Rats in the normal-control group were fed the 20% fat diet with cellulose. Disease-control rats exhibited much greater triglyceride (TG) deposition in the liver than the normal-control rats along with increased body weight gain, visceral fat mass, serum concentrations of cholesterol, triglyceride and nonesterified fatty acid (NEFA), and insulin resistance. Disease-control rats also had liver damage with increased oxidative stress and inflammation compared to the normal-control rats. MS1:3-H and MS1:5-H were found to have greater hepatic glycogen accumulation and decreased hepatic TG, insulin resistance, and dyslipidemia, with MS1:5-H being similar to the normal-control. MS1:3-H alleviated oxidative stress with lower hepatic lipid peroxide compared to MS1:5-H whereas MS1:5-H ameliorated inflammation and hepatocyte damage better than MS1:3-H. Both MS1:3-H and MS1:5-H potentiated hepatic insulin signaling (pAkt⟶pACC) and reduced the mRNA expression of TG synthesis genes mRNA (FAS and SREBP-1c). In the gut microbiome MS1:3-H elevated the ratio of Bacteroidales to Clostridiales in the cecum better than MS1:5-H but MS1:5-H reduced the proinflammatory Turicibacterales. In conclusion, both MS1:3-H and MS1:5-H prevented liver damage induced by high fat diets, mainly by suppressing oxidative stress and inflammation, respectively. MS1:3 and MS1:5 might be used as therapeutic agent for NAFLD.
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Fang Y, Wang S, Wu J, Zhang L, Wang Z, Gan L, He J, Shi H, Hou J. The kinetics and mechanism of α-glucosidase inhibition by F5-SP, a novel compound derived from sericin peptides. Food Funct 2018; 8:323-332. [PMID: 28045172 DOI: 10.1039/c6fo01215a] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The inhibition of α-glucosidase decreases postprandial blood glucose and therefore plays an important role in the treatment of type 2 diabetes mellitus. The present study investigated and characterized a peptide fraction of sericin hydrolysate, the kinetics of peptide-induced inhibition of α-glucosidase, and the interaction mechanism between the peptides and α-glucosidase. The fraction that eluted with 0.4 M NaCl (F5-SPs) on a DEAE-cellulose column exhibited significant inhibitory activity with an IC50 of 41 ± 1.94 μg mL-1. A kinetics analysis revealed that the F5-SP-induced inhibition was a reversible and parabolic mixed-type inhibition with a Ki value of 86.63 ± 0.014 μg mL-1. F5-SPs can bind to α-glucosidase at multiple sites to alter the conformation of α-glucosidase. F5-SPs were found to be rich in Gly, Ser, Glu, Tyr, Arg, and Pro, and had a sericin-conserved sequence SEDSSEVDIDLGNLG, as analyzed by Nano LC-MS/MS. Fluorescence spectra analysis showed that F5-SPs quenched the intrinsic fluorescence of α-glucosidase by a static quenching mechanism, and circular dichroism analysis suggested that the binding of F5-SPs to α-glucosidase resulted in the alteration of the secondary structure of an enzyme. The results of this study support the dietary recommendation of F5-SPs for the treatment of type 2 diabetes.
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Affiliation(s)
- Yuwen Fang
- Department of Food Science and Engineering, Shanghai Food Safety and Engineering Research Center, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Shaoyun Wang
- College of Biological Science and Engineering, Fuzhou University, Fuzhou 350108, China
| | - Jinhong Wu
- Department of Food Science and Engineering, Shanghai Food Safety and Engineering Research Center, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Li Zhang
- Department of Food Science and Engineering, Shanghai Food Safety and Engineering Research Center, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Zhengwu Wang
- Department of Food Science and Engineering, Shanghai Food Safety and Engineering Research Center, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Li Gan
- Department of Food Science and Engineering, Shanghai Food Safety and Engineering Research Center, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Jiajun He
- Department of Food Science and Engineering, Shanghai Food Safety and Engineering Research Center, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Haiming Shi
- Department of Food Science and Engineering, Shanghai Food Safety and Engineering Research Center, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Jingli Hou
- Department of Food Science and Engineering, Shanghai Food Safety and Engineering Research Center, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
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Santana AJ, Debastiani JC, Buratti P, Peretti AL, Kunz RI, Brancalhão RMC, Ribeiro LDFC, Torrejais MM, Bertolini GRF. Sericin and swimming on histomorphometric parameters of denervated plantar muscle in Wistar rats. ACTA ACUST UNITED AC 2018; 16:eAO4137. [PMID: 29694624 PMCID: PMC6063745 DOI: 10.1590/s1679-45082018ao4137] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Accepted: 10/13/2017] [Indexed: 12/23/2022]
Abstract
Objective To analyze the combined effects of the silk protein sericin and swimming exercise on histomorphometry of the plantar muscle in Wistar rats. Methods Forty adult rats were randomly allocated into 5 groups comprising 8 animals each, as follows: Control, Injury, Sericin, Swim, and Swim plus Sericin. Three days after crushing of the sciatic nerve the rats in the Swim and Swim plus Sericin Groups were submitted to swimming exercise for 21 days. Rats were then euthanized and the plantar muscle harvested and processed. Results Cross-sectional area, peripheral nuclei and muscle fiber counts, nucleus/fiber ratio and smallest muscle fiber width did not differ significantly between groups. Morphological analysis revealed hypertrophic fibers in the Swim Group and evident muscle damage in the Swim plus Sericin and Injury Groups. The percentage of intramuscular collagen was apparently maintained in the Swim Group compared to remaining groups. Conclusion Combined treatment with sericin and swimming exercise did not improve muscle properties. However, physical exercise alone was effective in maintaining intramuscular connective tissue and preventing progression of deleterious effects of peripheral nerve injury.
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Affiliation(s)
| | | | - Pâmela Buratti
- Universidade Estadual do Oeste do Paraná, Cascavel, PR, Brazil
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Xie F, Wang S, Zhang L, Wu J, Wang Z. Investigating inhibitory activity of novel synthetic sericin peptide on α-D-glucosidase: kinetics and interaction mechanism study using a docking simulation. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2018; 98:1502-1510. [PMID: 28799644 DOI: 10.1002/jsfa.8620] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 07/22/2017] [Accepted: 08/05/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND We synthesised a novel sericin peptide (SP-GI) with α-d-glucosidase inhibitory activity, which has a sequence of SEDSSEVDIDLGN. The kinetics of its peptide-induced inhibition on α-d-glucosidase activity and its interaction mechanism merging with molecular docking were both investigated. RESULTS SP-GI exhibited significant inhibitory activity with an IC50 of 2.9 ± 0.1 µmol L-1 and this inhibition was reversible and non-competitive with a Ki value of 1.0 ± 0.1 µmol L-1 . An interaction study with SP-GI revealed it bound to α-d-glucosidase at a single binding site, resulting in alterations in α-d-glucosidase secondary structure. This led to quenching of intrinsic α-d-glucosidase fluorescence by a static quenching mechanism. Molecular docking results showed that the SP-GI binding site on α-d-glucosidase differed from acarbose, with hydrogen bonding and van der Waals forces being the main binding drivers. CONCLUSION These findings suggest the potential use for SP-GI or other natural sericin peptides as dietary supplements for the treatment of type 2 diabetes. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Fan Xie
- Department of Food Science and Engineering, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Shaoyun Wang
- Institute of Food Biotechnology and Marine Bioresources, College of Biological Science and Technology, Fuzhou University, Fuzhou, China
| | - Li Zhang
- Department of Food Science and Engineering, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Jinhong Wu
- Department of Food Science and Engineering, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Zhengwu Wang
- Department of Food Science and Engineering, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
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Santana A, Debastiani JC, Kunz RI, Buratti P, Brancalhão RMC, de Fátima Chasko Ribeiro L, Torrejais MM, Bertolini GRF. Association of sericin and swimming on the phenotype, motor plate, and functionality of the denervated plantar muscle of Wistar rats. J Exerc Rehabil 2018; 14:24-31. [PMID: 29511649 PMCID: PMC5833964 DOI: 10.12965/jer.1835138.569] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 01/23/2018] [Indexed: 01/24/2023] Open
Abstract
Physical exercise may help maintain muscle properties and functional improvement after peripheral nerve lesion, which may be enhanced by using biocompatible substances, such as sericin. The aim of this study was analyse the effect of sericin associated with swimming exercise on the phenotype, innervation, and functionality of the plantar muscle of Wistar rats. Forty randomly divided adult rats were used in five groups of eight animals: control, injury, sericin, exercise, exercise and sericin. The application of sericin was done on the spot, 100 μL, shortly after nerve compression. Three days after sciatic nerve compression, the swimming and swimming and sericin groups were submitted to physical swimming exercise for 21 days. Afterwards, the animals were euthanised and the plantar muscle was dissected and submitted to histochemical and histoenzymological techniques. The grip strength test did not show alterations in muscular functionality, and the control presented greater muscle mass in relation to the other groups, the same did not occur for muscle length. Polymorphic neuromuscular junctions were detected in the groups, although without significant morphometric alterations of the area, major and minor diameters. The percentage of type I fibres was lower in the lesion group and there was no difference in fibres IIa and IIb between groups. The area of fibres I, IIa and IIb remained constant between groups. Sericin biopolymer combined with swimming exercise did not affect plantar muscle function, submitted to experimental axonotmosis, whose contractile properties were altered by nerve injury.
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Affiliation(s)
- André Santana
- Programa de Pós-Graduação em Biociências e Saúde da, Universidade Estadual do Oeste do Paraná (UNIOESTE), Cascavel, Brazil
| | - Jean Carlos Debastiani
- Programa de Pós-Graduação em Biociências e Saúde da, Universidade Estadual do Oeste do Paraná (UNIOESTE), Cascavel, Brazil
| | - Regina Inês Kunz
- Universidade Estadual do Oeste do Paraná (UNIOESTE), Cascavel, Brazil
| | - Pamela Buratti
- Programa de Pós-Graduação em Biociências e Saúde da, Universidade Estadual do Oeste do Paraná (UNIOESTE), Cascavel, Brazil
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Kim J, Park J, Lim K. Nutrition Supplements to Stimulate Lipolysis: A Review in Relation to Endurance Exercise Capacity. J Nutr Sci Vitaminol (Tokyo) 2017; 62:141-61. [PMID: 27465721 DOI: 10.3177/jnsv.62.141] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Athletes make great efforts to increase their endurance capacity in many ways. Using nutrition supplements for stimulating lipolysis is one such strategy to improve endurance performance. These supplements contain certain ingredients that affect fat metabolism; furthermore, in combination with endurance training, they tend to have additive effects. A large body of scientific evidence shows that nutrition supplements increase fat metabolism; however, the usefulness of lipolytic supplements as ergogenic functional foods remains controversial. The present review will describe the effectiveness of lipolytic supplements in fat metabolism and as an ergogenic aid for increasing endurance exercise capacity. There are a number of lipolytic supplements available on the market, but this review focuses on natural ingredients such as caffeine, green tea extract, L-carnitine, Garcinia cambogia (hydroxycitric acid), capsaicin, ginseng, taurine, silk peptides and octacosanol, all of which have shown scientific evidence of enhancing fat metabolism associated with improving endurance performance. We excluded some other supplements owing to lack of data on fat metabolism or endurance capacity. Based on the data in this review, we suggest that a caffeine and green tea extract improves endurance performance and enhances fat oxidation. Regarding other supplements, the data on their practical implications needs to be gathered, especially for athletes.
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Affiliation(s)
- Jisu Kim
- Department of Physical Education, Konkuk University
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The potential of silk sericin protein as a serum substitute or an additive in cell culture and cryopreservation. Amino Acids 2017; 49:1029-1039. [DOI: 10.1007/s00726-017-2396-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2016] [Accepted: 02/15/2017] [Indexed: 12/25/2022]
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Kim J, Park J, Kim B, Lee CH, Lim K, Suh H. Effects of different doses of silk peptide on energy metabolism during exercise in mice. J Exerc Nutrition Biochem 2017; 21:21-25. [PMID: 28828762 PMCID: PMC5569688 DOI: 10.20463/jenb.2017.0056] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Accepted: 11/26/2017] [Indexed: 12/03/2022] Open
Abstract
[Purpose] This study was carried out to determine the optimal dose of silk peptide for
enhancing fat metabolism during exercise. [Methods] Fifty male ICR mice were randomly divided into five groups: Sed, SP0, SP200,
SP400, and SP800. All SP mice underwent training by running on a treadmill 5
times a week for 2 weeks (20 m/min, 8° slope, 50 min/day for the
first week and 25 m/min, 8° slope, 50 min/day at about 70-75% of
maximum oxygen uptake for the second week). [Results] After the 2 weeks, fat oxidation was measured during a 1-h exercise at the
training conditions of the second week and was found to be 1.02 ±
0.15, 1.04 ± 0.17, 0.98 ± 0.10, 1.14 ± 0.19, and 1.15
± 0.07 g/kg/h for Sed, SP0, SP200, SP400, and SP800 groups,
respectively. The SP800 group had significantly higher fat oxidation levels
than the SP0 group did at 36, 40, and 56 min and the Sed group did at 2, 4,
6, 8, 12, 14, 16, 20, 40, 46, 50, 52, 56, and 60 min. However, there was no
significant difference among the groups in carbohydrate oxidation during the
1-h exercise. SP doses of 200 mg/kg and 400 mg/kg did not show any effect on
fat and carbohydrate oxidation. [Conclusion] In conclusion, 800 mg/kg of silk peptide is the optimal dose for enhancing
fat metabolism during exercise. In addition, silk peptide treatment could
reduce body weight by enhancing fat metabolism.
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Affiliation(s)
- Jisu Kim
- Physical Activity and Performance Institute (PAPI), Konkuk University, Seoul, Republic of Korea
| | - Jonghoon Park
- Department of Physical Education, Korea University, Seoul, Republic of Korea
| | - Bokyung Kim
- Department of Medicine, Konkuk University, Chungju, Republic of Korea
| | - Chi-Ho Lee
- Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul, Republic of Korea
| | - Kiwon Lim
- Physical Activity and Performance Institute (PAPI), Konkuk University, Seoul, Republic of Korea
| | - Heajung Suh
- Department of Physical Education, Konkuk University, Seoul, Republic of Korea
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A silk peptide fraction restores cognitive function in AF64A-induced Alzheimer disease model rats by increasing expression of choline acetyltransferase gene. Toxicol Appl Pharmacol 2016; 314:48-54. [PMID: 27871887 DOI: 10.1016/j.taap.2016.11.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 11/01/2016] [Accepted: 11/17/2016] [Indexed: 11/24/2022]
Abstract
This study investigated the effects of a silk peptide fraction obtained by incubating silk proteins with Protease N and Neutrase (SP-NN) on cognitive dysfunction of Alzheimer disease model rats. In order to elucidate underlying mechanisms, the effect of SP-NN on the expression of choline acetyltransferase (ChAT) mRNA was assessed in F3.ChAT neural stem cells and Neuro2a neuroblastoma cells; active amino acid sequence was identified using HPLC-MS. The expression of ChAT mRNA in F3.ChAT cells increased by 3.79-fold of the control level by treatment with SP-NN fraction. The active peptide in SP-NN was identified as tyrosine-glycine with 238.1 of molecular weight. Male rats were orally administered with SP-NN (50 or 300mg/kg) and challenged with a cholinotoxin AF64A. As a result of brain injury and decreased brain acetylcholine level, AF64A induced astrocytic activation, resulting in impairment of learning and memory function. Treatment with SP-NN exerted recovering activities on acetylcholine depletion and brain injury, as well as cognitive deficit induced by AF64A. The results indicate that, in addition to a neuroprotective activity, the SP-NN preparation restores cognitive function of Alzheimer disease model rats by increasing the release of acetylcholine.
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Kim B, Park J, Yoon HG, Choi KC, Kim K, Lee J, Chung JW, Shim S, You Y, Jun W. Effect of Ethanol Extract of Canavalia gladiata on Endurance Swimming Capacity in Mice. J Med Food 2016; 19:990-993. [PMID: 27696957 DOI: 10.1089/jmf.2016.3733] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The effects of Canavalia gladiata ethanolic extract on endurance swimming capacity were evaluated in a mouse model. The mice were orally administered distilled water (CON), hot water extract (CGW), or 80% ethanol extract (CGE). The swimming time to exhaustion was significantly prolonged in the CGE group. Of the three groups, the CGE showed the lowest blood lactate and the highest nonesterified fatty acid and muscle glycogen levels. These results suggest that the administration of CGE could improve endurance swimming capacity by enhancing lipid catabolism and thereby preserving glycogen stores.
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Affiliation(s)
- Beomjeong Kim
- 1 Division of Food and Nutrition, Chonnam National University , Gwangju, Republic of Korea
| | - Jeongjin Park
- 2 Research Institute for Human Ecology, Chonnam National University , Gwangju, Republic of Korea
| | - Ho-Geun Yoon
- 3 Department of Biochemistry and Molecular Biology, College of Medicine, Yonsei University , Seoul, Republic of Korea
| | - Kyung-Chul Choi
- 4 Department of Biomedical Sciences, University of Ulsan College of Medicine , Seoul, Republic of Korea
| | - Kyungmi Kim
- 5 Department of Biofood Analysis, Korea Bio Polytechnic , Ganggyung, Republic of Korea
| | - Jeongmin Lee
- 6 Department of Medical Nutrition, Kyung Hee University , Yongin, Republic of Korea
| | - Jin Woong Chung
- 7 Department of Biological Science, Dong-A University , Busan, Republic of Korea
| | - Sangin Shim
- 8 Division of Agriculture and Life Sciences, Gyeongsang National University , Jinju, Republic of Korea
| | - Yanghee You
- 1 Division of Food and Nutrition, Chonnam National University , Gwangju, Republic of Korea
| | - Woojin Jun
- 1 Division of Food and Nutrition, Chonnam National University , Gwangju, Republic of Korea.,2 Research Institute for Human Ecology, Chonnam National University , Gwangju, Republic of Korea
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Han BK, Lee HJ, Lee HS, Suh HJ, Park Y. Hypoglycaemic effects of functional tri-peptides from silk in differentiated adipocytes and streptozotocin-induced diabetic mice. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2016; 96:116-121. [PMID: 25557385 DOI: 10.1002/jsfa.7067] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2014] [Revised: 12/12/2014] [Accepted: 12/22/2014] [Indexed: 06/04/2023]
Abstract
BACKGROUND In this study, the tri-peptides Gly-Glu-Tyr (GEY) and Gly-Tyr-Gly (GYG), identified previously as active compounds from the silk peptide E5K6, significantly stimulated basal and insulin-mediated glucose uptake by 3T3-L1 fibroblasts in a dose-dependent manner. RESULTS Synthetic GEY and GYG peptides at a concentration of 500 µmol L(-1) significantly increased glucose transporter type 4 expression by 157% and 239%, respectively. Differentiation of 3T3-L1 cells into adipocytes leads to accumulation of intracellular fat droplets, and GEY and GYG at a concentration of 250 µmol L(-1) suppressed this effect by 72% and 75%, respectively. GYG improved glucose tolerance in steptozotocin (STZ)-induced diabetic mice in a dose-dependent manner. CONCLUSION These results suggest that GYG isolated from E5K6 has anti-diabetic potential and silk waste products containing bioactive peptides could be used to the developments of treatments to lower blood glucose.
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Affiliation(s)
| | - Hyun Jung Lee
- Department of Food and Nutrition, Korea University, Seoul 136-703, Republic of Korea
| | - Hyun-Sun Lee
- Food Quality & Safety Department, Agency for Korea National Food Cluster, Gwacheon, 427-806, Republic of Korea
| | - Hyung Joo Suh
- Department of Food and Nutrition, Korea University, Seoul 136-703, Republic of Korea
| | - Yooheon Park
- Department of Food and Nutrition, Korea University, Seoul 136-703, Republic of Korea
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15
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Processing and characterization of silk sericin from Bombyx mori and its application in biomaterials and biomedicines. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 61:940-52. [PMID: 26838924 DOI: 10.1016/j.msec.2015.12.082] [Citation(s) in RCA: 138] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 12/12/2015] [Accepted: 12/28/2015] [Indexed: 12/13/2022]
Abstract
Bombyx mori silk is composed of 60-80% fibroin, 15-35% sericin and 1-5% non-sericin component including wax, pigments, sugars and other impurities. For two decades, the protein-based silk fibroin was extensively used in the research and development of medical biomaterials and biomedicines. Sericin is frequently ignored and abandoned as a byproduct or waste in the processing of traditional silk fabrics, silk floss or modern silk biomaterials. However, similar to fibroin, sericin is not only a highly useful biological material, but also a lot of biological activity. Moreover, the non-sericin component present with sericin in the cocoon shell also has a strong biological activity. In this review, the extraction and recovery methods of sericin and the non-sericin component from the cocoon layer are reported, and their composition, properties and biological activity are described to produce a comprehensive report on biomedical materials and biological drugs. In addition, related problems or concerns present in the research and development of sericin are discussed, and a potential application of sericin in sustainable development is also presented.
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Kim D, Kyung J, Park D, Choi EK, Kim KS, Shin K, Lee H, Shin IS, Kang SK, Ra JC, Kim YB. Health Span-Extending Activity of Human Amniotic Membrane- and Adipose Tissue-Derived Stem Cells in F344 Rats. Stem Cells Transl Med 2015; 4:1144-54. [PMID: 26315571 DOI: 10.5966/sctm.2015-0011] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Accepted: 06/08/2015] [Indexed: 12/12/2022] Open
Abstract
UNLABELLED Aging brings about the progressive decline in cognitive function and physical activity, along with losses of stem cell population and function. Although transplantation of muscle-derived stem/progenitor cells extended the health span and life span of progeria mice, such effects in normal animals were not confirmed. Human amniotic membrane-derived mesenchymal stem cells (AMMSCs) or adipose tissue-derived mesenchymal stem cells (ADMSCs) (1×10(6) cells per rat) were intravenously transplanted to 10-month-old male F344 rats once a month throughout their lives. Transplantation of AMMSCs and ADMSCs improved cognitive and physical functions of naturally aging rats, extending life span by 23.4% and 31.3%, respectively. The stem cell therapy increased the concentration of acetylcholine and recovered neurotrophic factors in the brain and muscles, leading to restoration of microtubule-associated protein 2, cholinergic and dopaminergic nervous systems, microvessels, muscle mass, and antioxidative capacity. The results indicate that repeated transplantation of AMMSCs and ADMSCs elongate both health span and life span, which could be a starting point for antiaging or rejuvenation effects of allogeneic or autologous stem cells with minimum immune rejection. SIGNIFICANCE This study demonstrates that repeated treatment with stem cells in normal animals has antiaging potential, extending health span and life span. Because antiaging and prolonged life span are issues currently of interest, these results are significant for readers and investigators.
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Affiliation(s)
- Dajeong Kim
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea; Stem Cell Research Center, Biostar, Seoul, Republic of Korea
| | - Jangbeen Kyung
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea; Stem Cell Research Center, Biostar, Seoul, Republic of Korea
| | - Dongsun Park
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea; Stem Cell Research Center, Biostar, Seoul, Republic of Korea
| | - Ehn-Kyoung Choi
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea; Stem Cell Research Center, Biostar, Seoul, Republic of Korea
| | - Kwang Sei Kim
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea; Stem Cell Research Center, Biostar, Seoul, Republic of Korea
| | - Kyungha Shin
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea; Stem Cell Research Center, Biostar, Seoul, Republic of Korea
| | - Hangyoung Lee
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea; Stem Cell Research Center, Biostar, Seoul, Republic of Korea
| | - Il Seob Shin
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea; Stem Cell Research Center, Biostar, Seoul, Republic of Korea
| | - Sung Keun Kang
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea; Stem Cell Research Center, Biostar, Seoul, Republic of Korea
| | - Jeong Chan Ra
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea; Stem Cell Research Center, Biostar, Seoul, Republic of Korea
| | - Yun-Bae Kim
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea; Stem Cell Research Center, Biostar, Seoul, Republic of Korea
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Zubrzycki IZ, Ossowski Z, Przybylski S, Wiacek M, Clarke A, Trabka B. Supplementation with Silk Amino Acids improves physiological parameters defining stamina in elite fin-swimmers. J Int Soc Sports Nutr 2014; 11:57. [PMID: 25525417 PMCID: PMC4269914 DOI: 10.1186/s12970-014-0057-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 11/07/2014] [Indexed: 11/10/2022] Open
Abstract
Background Previous animal study has shown that supplementation with silk amino
acid hydrolysate (SAA) increases stamina in mice. The presented study was the
first formal evaluation of the influence of SAA supplementation on parameters
defining physiological fitness level in humans. Methods It was a randomized controlled trial with a parallel-group design on
elite male fin-swimmers. The experimental group was supplemented with 500 mg of
SAA per kg of body mass, dissolved in 250 ml of a Carborade Drink®; the control
group with Carborade Drink® alone; 3 times a day, 30 minutes prior to the training
session. Results Changes discerned in the experimental group were more pronounced
than those observed in the control group. For example, the change in the serum
lactic acid concentration observed in the experimental group was sevenfold less
than in the control group [21.8 vs. -3.7 L% for the control and experimental
groups, respectively]. An analysis of a lactate profile as a function of a maximal
swimming velocity exposed a statistically significant positive shift in the
swimming velocity of 0.05 m/s, at the lactate concentration of 4 mmol/L in the
experimental group. There was also a positive, although statistically
insignificant, increase of 2.6 L% in serum testosterone levels in the experimental
group. Conclusions This study showed that a 12-day SAA supplementation combined with an
extensive and rigorous training schedule was sufficient to increase an aerobic
stamina. However, this phenomenon was associated with an augmented level of
muscular damage (an increased level of creatine phosphokinase in the experimental
group).
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Affiliation(s)
- Igor Z Zubrzycki
- Jędrzej Śniadecki Academy of Physical Education and Sport ul, Kazimierza Górskiego 1, Gdańsk, 80-336 Poland.,School of Health and Applied Sciences, Polytechnic of Namibia, Private Bag 13388, 13 Storch Street, Windhoek, Namibia
| | - Zbigniew Ossowski
- Jędrzej Śniadecki Academy of Physical Education and Sport ul, Kazimierza Górskiego 1, Gdańsk, 80-336 Poland
| | - Stanislaw Przybylski
- Jędrzej Śniadecki Academy of Physical Education and Sport ul, Kazimierza Górskiego 1, Gdańsk, 80-336 Poland
| | - Magdalena Wiacek
- Jędrzej Śniadecki Academy of Physical Education and Sport ul, Kazimierza Górskiego 1, Gdańsk, 80-336 Poland
| | - Anna Clarke
- Department of Microbiology and Biochemistry, University of Fort Hare, P/B X1314, Alice, 5700 South Africa
| | - Bartosz Trabka
- Jędrzej Śniadecki Academy of Physical Education and Sport ul, Kazimierza Górskiego 1, Gdańsk, 80-336 Poland
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Kim J, Hwang H, Park J, Yun HY, Suh H, Lim K. Silk peptide treatment can improve the exercise performance of mice. J Int Soc Sports Nutr 2014; 11:35. [PMID: 25050085 PMCID: PMC4094671 DOI: 10.1186/1550-2783-11-35] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Accepted: 06/19/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND We previously reported that silk peptide (SP) treatment led to increased resting fat oxidation in exercised mice. However, it was not known whether SP treatment could effectively increase exercise capacity. Accordingly, this study aimed to examine whether SP treatment affected energy metabolism during exercise in addition to exercise performance. METHODS We randomized 36 7-week-old male ICR mice into 2 groups: the control (n = 18) and SP (n = 18) groups. All mice were trained by treadmill running 5 times per week for 2 weeks. SP was dissolved in distilled water and daily 800-mg/kg body weight doses before the running exercise were oral administered intraperitoneally to the SP group for 2 weeks. [Formula: see text] was measured before and after the 2 weeks training period. We also assessed energy metabolism during exercise for 1 h after the 2 week training period. In addition to blood samples, liver glycogen and gastrocnemius-white and gastrocnemius-red muscle was obtained at the following 3 time points: at rest, immediately after exercise, and 1-hour post exercise. RESULTS The [Formula: see text] max after 2 weeks of training was significantly increased (8%) in the SP group compared to the baseline; a similar result was not observed in the CON group. The sum of fat oxidation during a 1-h period tended to be 13% higher in the SP group than in the CON group (P < 0.077). In particular, the sum of fat oxidation was significantly higher in the SP group during the initial 20-min phase than that in the CON group (P < 0.05). The glycogen concentration in the white gastrocnemius muscle did not differ between the groups either rest or after 1 h of exercise but was significantly higher in the SP group than in the CON group during the recovery period (1 h post-exercise completion). CONCLUSIONS These results suggest that SP treatment can improve the exercise performance. Therefore, SP is considered to confer beneficial effects upon athletes, in whom exercise abilities are required.
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Affiliation(s)
- Jisu Kim
- Laboratory of Exercise Nutrition, Department of Physical Education, Konkuk University, 120, Neungdong-ro, Gwangin-gu, Seoul 143-701, Republic of Korea
| | - Hyejung Hwang
- Laboratory of Exercise Nutrition, Department of Physical Education, Konkuk University, 120, Neungdong-ro, Gwangin-gu, Seoul 143-701, Republic of Korea
| | - Jonghoon Park
- Laboratory of Exercise Nutrition, Department of Physical Education, Konkuk University, 120, Neungdong-ro, Gwangin-gu, Seoul 143-701, Republic of Korea
| | - Hea-Yeon Yun
- Laboratory of Exercise Nutrition, Department of Physical Education, Konkuk University, 120, Neungdong-ro, Gwangin-gu, Seoul 143-701, Republic of Korea
| | - Heajung Suh
- Laboratory of Exercise Nutrition, Department of Physical Education, Konkuk University, 120, Neungdong-ro, Gwangin-gu, Seoul 143-701, Republic of Korea
| | - Kiwon Lim
- Laboratory of Exercise Nutrition, Department of Physical Education, Konkuk University, 120, Neungdong-ro, Gwangin-gu, Seoul 143-701, Republic of Korea
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Kim J, Hwang H, Yun HY, Kim B, Lee CH, Suh H, Lim K. Silk peptide intake increases fat oxidation at rest in exercised mice. J Nutr Sci Vitaminol (Tokyo) 2014; 59:250-5. [PMID: 23883697 DOI: 10.3177/jnsv.59.250] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Silk peptides (SP) have been reported to decrease body weight and accumulate fat. We investigated the effects of SP administration by using an open circuit calorimetry system on resting energy expenditure and substrate utilization in resting mice for the duration of 24 h. Seven-week-old male ICR-mice were orally administered SP (800 mg/kg) for 2 wk and were subjected to endurance training. The results indicated that not only was oxygen uptake higher in the SP group than in the CON group (*p<0.05), but also the respiratory exchange rate was lower than that in the CON group for the duration of 24 h (**p<0.01). Moreover, fat oxidation was increased in the SP group. Body weight of the SP group was significantly decreased compared to that of the CON group (*p<0.05). These results suggest that intake of silk peptides increases fat oxidation during rest in exercised mice. Intake of silk peptides is considered to be a favorable supplement for athletes in training. In particular, it would be an effective supplement for athletes who require weight loss along with an increase in muscle mass.
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Affiliation(s)
- Jisu Kim
- Laboratory of Exercise Nutrition, Department of Physical Education, Konkuk University, Seoul 143-701, Republic of Korea
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20
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Kim J, Kyung J, Kim D, Choi EK, Bang P, Park D, Kim YB. Anti-obesity effects of Rapha diet® preparation in mice fed a high-fat diet. Lab Anim Res 2012; 28:265-71. [PMID: 23326287 PMCID: PMC3542385 DOI: 10.5625/lar.2012.28.4.265] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2012] [Revised: 12/07/2012] [Accepted: 12/11/2012] [Indexed: 01/15/2023] Open
Abstract
The anti-obesity activities of Rapha diet® preparation containing silkworm pupa peptide, Garcinia cambogia, white bean extract, mango extract, raspberry extract, cocoa extract, and green tea extract were investigated in mice with dietary obesity. Male C57BL/6 mice were fed a high-fat diet (HFD) containing 3% Rapha diet® preparation for 8 weeks, and blood and tissue parameters of obesity were analyzed. The HFD markedly enhanced body weight gain by increasing the weights of epididymal, perirenal, and mesenteric adipose tissues. The increased body weight gain induced by HFD was significantly reduced by feeding Rapha diet® preparation, in which decreases in the weight of abdominal adipose tissue and the size of abdominal adipocytes were confirmed by microscopic examination. Long-term feeding of HFD increased blood triglycerides and cholesterol levels, leading to hepatic lipid accumulation. However, Rapha diet® preparation not only reversed the blood lipid levels, but also attenuated hepatic steatosis. The results indicate that Rapha diet® preparation could improve HFD-induced obesity by reducing both lipid accumulation and the size of adipocytes.
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Affiliation(s)
- Jihyun Kim
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Korea
| | - Jangbeen Kyung
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Korea
| | - Dajeong Kim
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Korea
| | - Ehn-Kyoung Choi
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Korea
| | | | - Dongsun Park
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Korea
| | - Yun-Bae Kim
- College of Veterinary Medicine, Chungbuk National University, Cheongju, Korea
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21
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Jung HY, Lee AN, Song TJ, An HS, Kim YH, Kim KD, Kim IB, Kim KS, Han BS, Kim CH, Kim KS, Kim JB. Korean Mistletoe (Viscum album coloratum) Extract Improves Endurance Capacity in Mice by Stimulating Mitochondrial Activity. J Med Food 2012; 15:621-8. [DOI: 10.1089/jmf.2010.1469] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Affiliation(s)
- Hoe-Yune Jung
- School of Life and Food Sciences, Handong Global University, Pohang, Gyungbuk, Korea
- Brain Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea
- Bioactive Natural Products Reasearch Team, Pohang Center for Evaluaton of Biomaterials, Pohang, Korea
| | - An-Na Lee
- School of Life and Food Sciences, Handong Global University, Pohang, Gyungbuk, Korea
| | - Tae-Jun Song
- School of Life and Food Sciences, Handong Global University, Pohang, Gyungbuk, Korea
| | - Hyo-Sun An
- School of Life and Food Sciences, Handong Global University, Pohang, Gyungbuk, Korea
| | - Young-Hoon Kim
- School of Life and Food Sciences, Handong Global University, Pohang, Gyungbuk, Korea
| | - Kyu-Dae Kim
- School of Life and Food Sciences, Handong Global University, Pohang, Gyungbuk, Korea
| | - In-Bo Kim
- School of Life and Food Sciences, Handong Global University, Pohang, Gyungbuk, Korea
| | - Kyoung-Shim Kim
- Brain Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea
| | - Baek-Soo Han
- Brain Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea
| | - Chun-Hyung Kim
- Molecular Neurobiology Laboratory, Department of Psychiatry, McLean Hospital, Harvard Medical School, Belmont, Massachusetts, USA
| | - Kwang-Soo Kim
- Brain Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea
- Molecular Neurobiology Laboratory, Department of Psychiatry, McLean Hospital, Harvard Medical School, Belmont, Massachusetts, USA
| | - Jong-Bae Kim
- School of Life and Food Sciences, Handong Global University, Pohang, Gyungbuk, Korea
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Silk and silkworm pupa peptides suppress adipogenesis in preadipocytes and fat accumulation in rats fed a high-fat diet. Eur J Nutr 2011; 51:1011-9. [DOI: 10.1007/s00394-011-0280-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2011] [Accepted: 11/14/2011] [Indexed: 10/14/2022]
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Lee HJ, Lee HS, Choi JW, Ra KS, Kim JM, Suh HJ. Novel tripeptides with α-glucosidase inhibitory activity isolated from silk cocoon hydrolysate. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:11522-11525. [PMID: 21895007 DOI: 10.1021/jf202686m] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Active compounds with antidiabetic potential were isolated from silk peptide E5K6 by consecutive ultrafiltration and gel filtration using Biogel P-2 and RS-HPLC using a YMC-Pack Pro C18 column. The highest α-glucosidase inhibitory activity of silk peptide E5K6 resulted from fractions with MW <1 kDa. The activities of gel-filtered fractions from silk peptide E5K6 of <1 kDa were assayed in vitro, demonstrating that the fourth peak (F4) had the highest α-glucosidase inhibitory activity (IC(50) = 37.1 mg/mL). F4 of silk peptide E5K6 was separated by HPLC into two peaks. Moreover, the purified compounds were identified as Gly-Glu-Tyr (GEY, MW = 367 Da) and Gly-Tyr-Gly (GYG, MW = 295 Da) according to amino acid sequences, and their α-glucosidase inhibitory activities (IC(50)) were 2.7 and 1.5 mg/mL, respectively.
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Affiliation(s)
- Hyun Jung Lee
- Department of Food and Nutrition, Korea University, Seoul 130-701, Republic of Korea
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Kim TK, Park D, Yeon S, Lee SH, Choi YJ, Bae DK, Yang YH, Yang G, Joo SS, Lim WT, Lee JY, Lee JS, Jeong HS, Hwang SY, Kim YB. Tyrosine-fortified silk amino acids improve physical function of Parkinson’s disease rats. Food Sci Biotechnol 2011. [DOI: 10.1007/s10068-011-0011-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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