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Zhang S, Guo J, Suo S, Ju L, Jiang Z, Dong P, Wang Y, Dang Y, Du L. In vitro gastrointestinal digestion simulation screening of novel ACEI peptides from broccoli: mechanism in high glucose-induced VSMCs dysfunction. Front Nutr 2025; 12:1528184. [PMID: 39931369 PMCID: PMC11807808 DOI: 10.3389/fnut.2025.1528184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2024] [Accepted: 01/06/2025] [Indexed: 02/13/2025] Open
Abstract
Many natural angiotensin-converting enzyme inhibitory (ACEI) peptides have been widely studied. However, their stability in vivo is poor in most cases. In this study, peptides were initially digested from broccoli in vitro, and absorption was simulated by Caco2 cells transport and then analyzed by Peptideomics and molecular docking. Subsequently, the mechanisms were verified using a high glucose-induced vascular smooth muscle cells (VSMCs) dysfunction model. Results showed that ACEI activity of broccoli crude peptide increased by 70.73 ± 1.42% after digestion. The enzymatic hydrolysates of crude broccoli peptides before and after digestion were detected by HPLC. The digested crude peptides were highly stable (with a stability level > 90%) in the intestine and possessed a strong absorptive potential. Five peptides with high stability and strong permeability were first identified, including HLEVR, LTEVR, LEHGF, HLVNK, and LLDGR, which exhibited high activity with IC50 values of 3.19 ± 0.23 mM, 17.07 ± 1.37 mM, 0.64 ± 0.02 mM, 0.06 ± 0.01 mM, and 2.81 ± 0.12 mM, respectively. When the VSMCs model was exposed to Ang II, the expressions of PCNA, MMP2, and Bcl2 were increased, while the expression of BAX was inhibited. When the VSMCs was exposed to high glucose (HG), the Ang II concentration significantly increased. This indicates that HG elevated Ang II levels. Finally, five peptides significantly attenuated Ang II-induced VSMCs proliferation and migration by down-regulating AT1R expression and inhibiting ERK and p38 MAPK phosphorylation. Notably, in exploring VSMCs dysfunction on a high glucose-induced model, ACEI peptides resulted in down-regulation of ACE and up-regulation of ACE2 expression. Therefore, it can be further referenced for the functional food against hypertension and cardiovascular diseases.
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Affiliation(s)
- Shuzhi Zhang
- School of Phamacy, Hangzhou Medical College, Hangzhou, China
| | - Jingjing Guo
- Luoyang Key Laboratory of Cardiovascular Science, The First Affiliated Hospital, and College of Clinical Medicine of Henan University of Science and Technology, Luoyang, China
| | - Shikun Suo
- College of Food Science and Engineering, Ningbo University, Ningbo, China
| | - Li Ju
- School of Phamacy, Hangzhou Medical College, Hangzhou, China
| | - Zhaoqiang Jiang
- School of Phamacy, Hangzhou Medical College, Hangzhou, China
| | - Pingshuan Dong
- Henan Provincial Key Laboratory of Cardiovascular Disease Medicine, The First Affiliated Hospital, and College of Clinical Medicine of Henan University of Science and Technology, Luoyang, China
| | - Yanli Wang
- College of Food Science and Engineering, Ningbo University, Ningbo, China
| | - Yali Dang
- College of Food Science and Engineering, Ningbo University, Ningbo, China
| | - Laijing Du
- Luoyang Key Laboratory of Cardiovascular Science, The First Affiliated Hospital, and College of Clinical Medicine of Henan University of Science and Technology, Luoyang, China
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Raj P, Bouchard J, Martineau-Côté D, Malunga L, L’Hocine L, Yu L, Sobhi B, Achouri A, Pitre M, Thandapilly SJ, Netticadan T. Oat-Protein-Based Diet Lowers Blood Pressure and Prevents Cardiac Remodeling and Dysfunction in Spontaneously Hypertensive Rats. Nutrients 2024; 16:3870. [PMID: 39599656 PMCID: PMC11597841 DOI: 10.3390/nu16223870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2024] [Revised: 10/29/2024] [Accepted: 10/31/2024] [Indexed: 11/29/2024] Open
Abstract
Background/Objectives: Hypertension and its associated complications, such as cardiac remodeling and dysfunction, continue to impose a significant burden on global healthcare. Nutritional interventions have been recognized as playing a crucial role in addressing this devastating condition termed a 'silent killer'. Plant-based proteins could potentially be utilized as a non-pharmacological strategy to combat hypertension and its related risk factors. In this study, we investigated the efficacy of an oat protein diet in managing hypertension and cardiac abnormalities. Methods: Four-week-old male spontaneously hypertensive rats (SHRs) and Wistar-Kyoto (WKY) rats were fed a regular diet with casein as a protein source or an oat-protein-based diet for 16 weeks. Twenty-week-old male SHRs showed high blood pressure (BP), cardiac remodeling, cardiac dysfunction, higher levels of markers of oxidative stress [malondialdehyde (MDA)] and inflammation [tumor necrosis factor-α (TNF-α)], as well as lower levels of a marker of vascular function (nitric oxide). Results: The oat protein diet was able to significantly lower high BP, prevent cardiac remodeling and dysfunction, improve the levels of nitric oxide, and reduce the levels of TNF-α. Oat protein, after in vitro gastrointestinal digestion, also exhibited angiotensin-converting enzyme inhibition and significantly higher antioxidant activity than casein when assessed with the 2,2-diphenyl-1-picrylhydrazyl and the iron-chelating assays in vitro.Conclusions: oat protein lowers BP and prevents cardiac remodeling and dysfunction partly via improving the levels of nitric oxide and TNF-αin SHRs. Its high antioxidant potential could contribute to the observed cardiovascular effects.
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Affiliation(s)
- Pema Raj
- St. Boniface Hospital Research Centre, Winnipeg, MB R2H 2A6, Canada
| | - Jenny Bouchard
- Richardson Center for Food Technology and Research, Winnipeg, MB R3T 2N2, Canada
- Department of Human Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - Delphine Martineau-Côté
- Agriculture and Agri-Food Canada, Saint-Hyacinthe Research and Development Centre, Saint-Hyacinthe, QC J2S 8E3, Canada
| | - Lovemore Malunga
- Richardson Center for Food Technology and Research, Winnipeg, MB R3T 2N2, Canada
- Department of Human Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
- Agriculture and Agri-Food Canada, Winnipeg, ON K1A 0C5, Canada
| | - Lamia L’Hocine
- Agriculture and Agri-Food Canada, Saint-Hyacinthe Research and Development Centre, Saint-Hyacinthe, QC J2S 8E3, Canada
| | - Liping Yu
- Agriculture and Agri-Food Canada, Winnipeg, ON K1A 0C5, Canada
- Canadian Centre for Agri-Food Research in Health and Medicine, Winnipeg, MB R2H 2A6, Canada
| | - Babak Sobhi
- Agriculture and Agri-Food Canada, Winnipeg, ON K1A 0C5, Canada
| | - Allaoua Achouri
- Agriculture and Agri-Food Canada, Saint-Hyacinthe Research and Development Centre, Saint-Hyacinthe, QC J2S 8E3, Canada
| | - Mélanie Pitre
- Agriculture and Agri-Food Canada, Saint-Hyacinthe Research and Development Centre, Saint-Hyacinthe, QC J2S 8E3, Canada
| | - Sijo Joseph Thandapilly
- Richardson Center for Food Technology and Research, Winnipeg, MB R3T 2N2, Canada
- Agriculture and Agri-Food Canada, Winnipeg, ON K1A 0C5, Canada
- Canadian Centre for Agri-Food Research in Health and Medicine, Winnipeg, MB R2H 2A6, Canada
| | - Thomas Netticadan
- Agriculture and Agri-Food Canada, Winnipeg, ON K1A 0C5, Canada
- Canadian Centre for Agri-Food Research in Health and Medicine, Winnipeg, MB R2H 2A6, Canada
- Department of Physiology and Pathophysiology, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
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ACE2-Inhibitory Effects of Bromelain and Ficin in Colon Cancer Cells. MEDICINA (KAUNAS, LITHUANIA) 2023; 59:medicina59020301. [PMID: 36837502 PMCID: PMC9962737 DOI: 10.3390/medicina59020301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 01/17/2023] [Accepted: 02/03/2023] [Indexed: 02/10/2023]
Abstract
Background and Objectives: Bromelain and ficin are aqueous extracts from fruits of Ananas comosus and Ficus carcia plants, used widely for medical applications. Angiotensin-converting enzyme 2 (ACE2) is a homolog of ACE, degrading Ang II to angiotensin 1-7 and decreasing the cellular concentration of Ang II. Materials and Methods: In this study, we investigated the ACE2-inhibitory, antiproliferative, and apoptosis-inducing effects of ficin and bromelain on caco-2 cells. Results: We found that bromelain and ficin significantly reduced the viability of human colon cancer cells with IC50 value concentrations of 8.8 and 4.2 mg/mL for bromelain after 24 and 48 h treatments, and 8.8 and 4.2 mg/mL for ficin after 24 and 48 h treatments, respectively. The apoptosis of the caco-2 cell line treated with bromelain was 81.04% and 56.70%, observed after 24 and 48 h. Total apoptotic proportions in caco-2 cells treated with ficin after 24 and 48 h were 83.7% and 73.0%. An amount of 1.6 mg/mL of bromelain and ficin treatments on caco-2 cells after 24 h revealed a higher decrease than that of other concentrations in the expression of ACE2 protein. Conclusions: In conclusion, bromelain and ficin can dose-dependently decrease the expression of ACE2 protein in caco-2 cells.
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Li Y, Shi P, Zheng Y, Guo M, Zhuang Y, Huo X. Millet bran protein hydrolysates derived peptides-zinc chelate: Structural characterization, security prediction in silico, zinc transport capacity and stability against different food processing conditions. J Food Sci 2023; 88:477-490. [PMID: 36444531 DOI: 10.1111/1750-3841.16384] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 09/29/2022] [Accepted: 10/24/2022] [Indexed: 11/30/2022]
Abstract
A novel peptide Ser-Asp-Asp-Val-Leu (SDDVL) of excellent zinc-chelating capacity (13.77 mg/g) was identified in millet bran protein hydrolysates. In silico prediction demonstrated that SDDVL had no potential toxicity. The results of structural characterization demonstrated that both amino group and carboxyl group of SDDVL were the primary zinc-chelating sites. Moreover, SDDVL-zinc chelate showed higher stability (p < 0.05) than ZnSO4 and zinc gluconate under different processing conditions including most pasteurization conditions, heating at 100°C for 10-50 min, various pH values (8.0-10.0), treatment of glucose (4-8 g/100 g) or NaCl (1-4 g/100 g), and simulated gastrointestinal digestion. In addition, SDDVL-zinc chelate showed higher zinc transport capacity than ZnSO4 and zinc gluconate in Caco-2 cells (p < 0.05). These results suggested that millet bran peptide had a positive effect on the gastrointestinal stability and bioavailability of Zn, and SDDVL-zinc chelate could be used as ingredient of zinc supplements. PRACTICAL APPLICATION: The current study provided a practical method to identify peptides of excellent zinc-chelating capacity from millet bran protein hydrolysates. This study demonstrated that in silico prediction assisted with suitable database was a fast, practical, and economic way to evaluate the security and to analysis the physicochemical properties of novel peptides. Moreover, it provided an efficient method to assess the stability of peptide-zinc chelate under different food processing conditions, which was the theoretical basis for utilization of peptide as ingredient of zinc fortifications.
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Affiliation(s)
- Yan Li
- Food Science College, Shanxi Normal University, Taiyuan, China
| | - Panqi Shi
- Food Science College, Shanxi Normal University, Taiyuan, China
| | - Yajun Zheng
- Food Science College, Shanxi Normal University, Taiyuan, China
| | - Min Guo
- Food Science College, Shanxi Normal University, Taiyuan, China
| | - Yongliang Zhuang
- Yunnan Institute of Food Safety, Kunming University of Science and Technology, Kunming, China
| | - Xinyu Huo
- Food Science College, Shanxi Normal University, Taiyuan, China
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Zhang T, Tian Z, Sun L, Zhuang Y. Effect of different cadmium levels in Boletus griseus on bioaccessibility, bioavailability, and intestinal flora by establishing a complete bionic digestion system in vitro. J Food Sci 2022; 87:3677-3689. [PMID: 35762635 DOI: 10.1111/1750-3841.16231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Revised: 05/10/2022] [Accepted: 05/27/2022] [Indexed: 11/30/2022]
Abstract
The bioaccessibility and bioavailability of different cadmium (Cd) levels (low: 7.31 mg/kg, medium: 24.20 mg/kg, high: 41.64 mg/kg) in Boletus griseus were evaluated by establishing a bionic digestive system in vitro. The results showed that the bioaccessibility of high Cd level by gastrointestinal digestion was significantly higher than other two levels. Further, colonic digestion significantly increased the bioaccessibilities of low Cd level (p < 0.05). After intestinal flora fermentation, the bioaccessibilities of different Cd levels significantly decreased (p < 0.05), and high and medium Cd levels had no significant difference (p > 0.05). A Caco-2 monolayer cell model was established to evaluate the bioavailability of Cd. The bioavailabilities of low and high Cd levels by gastrointestinal digestion were 8.75 and 10.58%, and the bioavailabilities increased by 38.17% and 5.20% after colonic digestion, respectively. Furthermore, Cd could affect diversity, composition, and balance of intestinal flora, and the relative abundances of several genera were correlation with Cd levels in B. griseus.
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Affiliation(s)
- Tingting Zhang
- Faculty of Food Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Zhen Tian
- Faculty of Food Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Liping Sun
- Faculty of Food Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Yongliang Zhuang
- Faculty of Food Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, China
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He J, Guo H, Zhang M, Wang M, Sun L, Zhuang Y. Purification and Characterization of a Novel Calcium-Binding Heptapeptide from the Hydrolysate of Tilapia Bone with Its Osteogenic Activity. Foods 2022; 11:468. [PMID: 35159617 PMCID: PMC8834476 DOI: 10.3390/foods11030468] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 01/28/2022] [Accepted: 02/02/2022] [Indexed: 02/01/2023] Open
Abstract
In this study, a calcium-binding peptide was obtained by hydrolyzing tilapia bone and its osteogenic activity was evaluated. Animal protease was selected from nine enzymes, and its hydrolysate was purified through preparative and semi-preparative reverse phase high-performance liquid chromatography. The purified peptide was identified as DGPSGPK (656.32 Da) and its calcium-binding capacity reached 111.98 µg/mg. The peptide calcium chelate (DGPSGPK-Ca) was obtained, and its structure was characterized through Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and mass spectrometry (MS). The results of XRD and SEM showed that DGPSGPK-Ca was formed as a new compound. The carboxyl and amino groups of Lys and Asp residues may be the chelating sites of DGPSGPK according to the FTIR and MS results. The molecular simulation showed the carbonyl groups of Asp, Pro, Ser, and Lys residues involved in the binding of calcium. The interaction of DGPSGPK and different integrins was evaluated by molecular docking simulation, and the main forces involved were electrostatic interaction forces, hydrogen bonding and hydrophobic interactions. Furthermore, DGPSGPK could inhibit the differentiation of osteoclast and promote the proliferation, differentiation and mineralization of osteoblasts.
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Affiliation(s)
- Jinlun He
- Faculty of Food Science and Engineering, Kunming University of Science and Technology, No. 727 South Jingming Road, Kunming 650500, China
| | - Hao Guo
- Faculty of Food Science and Engineering, Kunming University of Science and Technology, No. 727 South Jingming Road, Kunming 650500, China
| | - Mei Zhang
- Faculty of Food Science and Engineering, Kunming University of Science and Technology, No. 727 South Jingming Road, Kunming 650500, China
| | - Meng Wang
- Faculty of Food Science and Engineering, Kunming University of Science and Technology, No. 727 South Jingming Road, Kunming 650500, China
| | - Liping Sun
- Faculty of Food Science and Engineering, Kunming University of Science and Technology, No. 727 South Jingming Road, Kunming 650500, China
| | - Yongliang Zhuang
- Faculty of Food Science and Engineering, Kunming University of Science and Technology, No. 727 South Jingming Road, Kunming 650500, China
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Lu Y, Wang Y, Huang D, Bian Z, Lu P, Fan D, Wang X. Inhibitory mechanism of angiotensin-converting enzyme inhibitory peptides from black tea. J Zhejiang Univ Sci B 2021; 22:575-589. [PMID: 34269010 DOI: 10.1631/jzus.b2000520] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The aim of this work is to discover the inhibitory mechanism of tea peptides and to analyse the affinities between the peptides and the angiotensin-converting enzyme (ACE) as well as the stability of the complexes using in vitro and in silico methods. Four peptide sequences identified from tea, namely peptides I, II, III, and IV, were used to examine ACE inhibition and kinetics. The half maximal inhibitory concentration (IC50) values of the four peptides were (210.03±18.29), (178.91±5.18), (196.31±2.87), and (121.11±3.38) μmol/L, respectively. The results of Lineweaver-Burk plots showed that peptides I, II, and IV inhibited ACE activity in an uncompetitive manner, which requires the presence of substrate. Peptide III inhibited ACE in a non-competitive manner, for which the presence of substrate is not necessary. The docking simulations showed that the four peptides did not bind to the active sites of ACE, indicating that the four peptides are allosteric inhibitors. The binding free energies calculated from molecular dynamic (MD) simulation were -72.47, -42.20, -52.10, and -67.14 kcal/mol (1 kcal=4.186 kJ), respectively. The lower IC50 value of peptide IV may be attributed to its stability when docking with ACE and changes in the flexibility and unfolding of ACE. These four bioactive peptides with ACE inhibitory ability can be incorporated into novel functional ingredients of black tea.
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Affiliation(s)
- Yating Lu
- Tea Research Institute, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Yu Wang
- Tea Research Institute, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Danyi Huang
- Tea Research Institute, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Zhuang Bian
- Tea Research Institute, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Peng Lu
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
| | - Dongmei Fan
- Tea Research Institute, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Xiaochang Wang
- Tea Research Institute, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China
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Identification, Characterization and Antihypertensive Effect In Vivo of a Novel ACE-Inhibitory Heptapeptide from Defatted Areca Nut Kernel Globulin Hydrolysates. Molecules 2021; 26:molecules26113308. [PMID: 34072901 PMCID: PMC8199471 DOI: 10.3390/molecules26113308] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/25/2021] [Accepted: 05/21/2021] [Indexed: 11/16/2022] Open
Abstract
The areca (Areca catechu L.) nut kernel (ANK) is a good potential protein source for its high protein content of 9.89-14.62 g/100 g and a high yield of around 300,000 tons per year in China. However, utilization of the areca nut kernel is limited. To expand the usage of ANK in pharmaceutical or foods industries, areca nut kernel globulin was extracted and angiotensin-I converting enzyme (ACE) inhibition peptides were prepared and identified using gel chromatography, reversed phase HPLC separation, UPLC-ESI-MS/MS analysis and in silico screening. Finally, a novel ACE-inhibitory heptapeptide (Ala-Pro-Lys-Ile-Glu-Glu-Val) was identified and chemically synthesized. The combination pattern between APKIEEV and ACE, and the inhibition kinetics, antihypertensive effect and endothlein-1 inhibition activity of APKIEEV were studied. The results of the molecular docking demonstrated that APKIEEV could bind to four active sites (not the key active sites) of ACE via short hydrogen bonds and demonstrated high ACE-inhibitory activity (IC50: 550.41 μmol/L). Moreover, APKIEEV exhibited a significantly lowering effect on both the systolic blood pressure and diastolic blood pressure of spontaneously hypertensive rats, and had considerable suppression ability on intracellular endothelin-1. These results highlight the potential usage of APKIEEV as ingredients of antihypertensive drugs or functional foods.
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Interaction effect of phenolic compounds on Alaska Pollock skin gelatin and associated changes. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2020.110018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Yu Z, Wang L, Wu S, Zhao W, Ding L, Liu J. In vivo
anti‐hypertensive effect of peptides from egg white and its molecular mechanism with ACE. Int J Food Sci Technol 2020. [DOI: 10.1111/ijfs.14756] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Zhipeng Yu
- College of Food Science and Engineering Bohai University Jinzhou121013China
| | - Li Wang
- College of Food Science and Engineering Bohai University Jinzhou121013China
| | - Sijia Wu
- College of Food Science and Engineering Bohai University Jinzhou121013China
| | - Wenzhu Zhao
- College of Food Science and Engineering Bohai University Jinzhou121013China
| | - Long Ding
- College of Food Science and Engineering Northwest A&F University Yangling712100China
| | - Jingbo Liu
- Lab of Nutrition and Functional Food Jilin University Changchun130062China
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Effect of Peptides from Alaska Pollock on Intestinal Mucosal Immunity Function and Purification of Active Fragments. Nutrients 2019; 11:nu11102517. [PMID: 31635335 PMCID: PMC6835260 DOI: 10.3390/nu11102517] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Revised: 10/01/2019] [Accepted: 10/12/2019] [Indexed: 12/23/2022] Open
Abstract
The intestinal mucosal barrier plays an important role in systemic immune functions. This study aimed to find the mechanism of peptide from Alaska Pollock (APP) on intestinal mucosal immunity in mice induced by cyclophosphamide (Cy). Cy-induced decreases of body weight and index of immune organ were significantly improved by APP as compared with Cy group (p < 0.05). APP could promote the secretion of SIgA and IgA on intestinal mucosa (p < 0.05) and mainly had an impact on the final differentiation of IgA+ B cell, thereby promoting the secretion of plasma cells, which can be corroborated by the increases of IL-6 and IL-10 (p < 0.05). APP with high immune activity was separated and two peptides were purified and identified as Gly–Val–Ile–Lys and Ala–Cys–Asn–Gly–Arg. Therefore, APP can be considered as beneficial ingredients to protect the intestinal barrier disruption induced by Cy.
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