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Zhang J, Wu Y, Tang H, Li H, Da S, Ciren D, Peng X, Zhao K. Identification, characterization, and insights into the mechanism of novel dipeptidyl peptidase-IV inhibitory peptides from yak hemoglobin by in silico exploration, molecular docking, and in vitro assessment. Int J Biol Macromol 2024; 259:129191. [PMID: 38184042 DOI: 10.1016/j.ijbiomac.2023.129191] [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: 09/10/2023] [Revised: 12/17/2023] [Accepted: 12/31/2023] [Indexed: 01/08/2024]
Abstract
Dipeptidyl peptidase IV (DPP-IV) inhibitory peptides were screened and identified from yak hemoglobin for the first time by in silico analysis, molecular docking, and in vitro evaluation. Results showed that yak hemoglobin had a high potential to produce DPP-IV inhibitory peptides based on the sequence alignment and bioactive potential evaluation. Furthermore, "pancreatic elastase + stem bromelain" was the optimal combined-enzymatic strategy by simulated proteolysis. Additionally, 25 novel peptides were found from its simulated hydrolysate, among which 10 peptides had high binding affinities with DPP-IV by molecular docking. Most of these peptides were also in silico characterized with favorable physicochemical properties and biological potentials, including relatively low molecular weight, high hydrophobicity, several net charges, good water solubility, nontoxicity, acceptable sensory quality, and good human intestinal absorption. Finally, six novel DPP-IV inhibitory peptides were identified via in vitro assessment, among which EEKA (IC50 = 235.26 μM), DEV (IC50 = 339.45 μM), and HCDKL (IC50 = 632.93 μM) showed the strongest capacities. The hydrogen bonds and electrostatic attractions formed with core residues within the S2 pocket of DPP-IV could be mainly responsible for their inhibition performances. This work provided a time-saving method and broadened application for yak by-products development as sources of functional foods.
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Affiliation(s)
- Jin Zhang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Food Science, Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, PR China.
| | - Yulong Wu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Food Science, Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, PR China; School of Public Health, Hangzhou Normal University, Hangzhou, Zhejiang 311121, PR China
| | - Honggang Tang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Food Science, Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, PR China.
| | - Huanhuan Li
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Food Science, Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, PR China
| | - Se Da
- Gonyal Animal Husbandry Technology and Industry Co., Naqu, Tibet 852014, PR China
| | - Dajie Ciren
- Gonyal Animal Husbandry Technology and Industry Co., Naqu, Tibet 852014, PR China
| | - Xinyan Peng
- College of Life Science, Yantai University, Yantai, Shandong 264005, PR China
| | - Ke Zhao
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Food Science, Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang 310021, PR China.
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Fleury L, Deracinois B, Dugardin C, Nongonierma AB, FitzGerald RJ, Flahaut C, Cudennec B, Ravallec R. In Vivo and In Vitro Comparison of the DPP-IV Inhibitory Potential of Food Proteins from Different Origins after Gastrointestinal Digestion. Int J Mol Sci 2022; 23:ijms23158365. [PMID: 35955493 PMCID: PMC9369239 DOI: 10.3390/ijms23158365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 07/25/2022] [Accepted: 07/26/2022] [Indexed: 11/16/2022] Open
Abstract
Dipeptidyl-peptidase IV (DPP-IV) plays an essential role in glucose metabolism by inactivating incretins. In this context, food-protein-derived DPP-IV inhibitors are promising glycemic regulators which may act by preventing the onset of type 2 diabetes in personalized nutrition. In this study, the DPP-IV-inhibitory potential of seven proteins from diverse origins was compared for the first time in vitro and in vivo in rat plasma after the intestinal barrier (IB) passage of the indigested proteins. The DPP-IV-inhibitory potentials of bovine hemoglobin, caseins, chicken ovalbumin, fish gelatin, and pea proteins were determined in rat plasma thirty minutes after oral administration. In parallel, these proteins, together with bovine whey and gluten proteins, were digested using the harmonized INFOGEST protocol adapted for proteins. The DPP-IV half-maximal inhibitory concentration (IC50) was determined in situ using Caco-2 cells. The DPP-IV-inhibitory activity was also measured after IB passage using a Caco2/HT29-MTX mixed-cell model. The peptide profiles were analyzed using reversed-phase high-performance liquid chromatography tandem mass spectrometry (RP-HPLC-MS/MS) with MS data bioinformatics management, and the IC50 of the identified peptides was predicted in silico. The in vitro and in vivo DPP-IV-inhibitory activity of the proteins differed according to their origin. Vegetable proteins and hemoglobin yielded the highest DPP-IV-inhibitory activity in vivo. However, no correlation was found between the in vivo and in vitro results. This may be partially explained by the differences between the peptidome analysis and the in silico predictions, as well as the study complexity.
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Affiliation(s)
- Léa Fleury
- UMR-T 1158, BioEcoAgro, University of Lille, 59650 Lille, France; (L.F.); (B.D.); (C.D.); (C.F.)
| | - Barbara Deracinois
- UMR-T 1158, BioEcoAgro, University of Lille, 59650 Lille, France; (L.F.); (B.D.); (C.D.); (C.F.)
| | - Camille Dugardin
- UMR-T 1158, BioEcoAgro, University of Lille, 59650 Lille, France; (L.F.); (B.D.); (C.D.); (C.F.)
| | - Alice B. Nongonierma
- Department of Biological Sciences, University of Limerick, V94 T9PX Limerick, Ireland; (A.B.N.); (R.J.F.)
| | - Richard J. FitzGerald
- Department of Biological Sciences, University of Limerick, V94 T9PX Limerick, Ireland; (A.B.N.); (R.J.F.)
| | - Christophe Flahaut
- UMR-T 1158, BioEcoAgro, University of Lille, 59650 Lille, France; (L.F.); (B.D.); (C.D.); (C.F.)
| | - Benoit Cudennec
- UMR-T 1158, BioEcoAgro, University of Lille, 59650 Lille, France; (L.F.); (B.D.); (C.D.); (C.F.)
- Correspondence: (B.C.); (R.R.)
| | - Rozenn Ravallec
- UMR-T 1158, BioEcoAgro, University of Lille, 59650 Lille, France; (L.F.); (B.D.); (C.D.); (C.F.)
- Correspondence: (B.C.); (R.R.)
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Characteristics of Food Protein-Derived Antidiabetic Bioactive Peptides: A Literature Update. Int J Mol Sci 2021; 22:ijms22179508. [PMID: 34502417 PMCID: PMC8431147 DOI: 10.3390/ijms22179508] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 08/29/2021] [Accepted: 08/30/2021] [Indexed: 12/25/2022] Open
Abstract
Diabetes, a glucose metabolic disorder, is considered one of the biggest challenges associated with a complex complication of health crises in the modern lifestyle. Inhibition or reduction of the dipeptidyl peptidase IV (DPP-IV), alpha-glucosidase, and protein-tyrosine phosphatase 1B (PTP-1B) enzyme activities or expressions are notably considered as the promising therapeutic strategies for the management of type 2 diabetes (T2D). Various food protein-derived antidiabetic bioactive peptides have been isolated and verified. This review provides an overview of the DPP-IV, PTP-1B, and α-glucosidase inhibitors, and updates on the methods for the discovery of DPP-IV inhibitory peptides released from food-protein hydrolysate. The finding of novel bioactive peptides involves studies about the strategy of separation fractionation, the identification of peptide sequences, and the evaluation of peptide characteristics in vitro, in silico, in situ, and in vivo. The potential of bioactive peptides suggests useful applications in the prevention and management of diabetes. Furthermore, evidence of clinical studies is necessary for the validation of these peptides’ efficiencies before commercial applications.
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Assenov B, Pechlivanova D, Dzhambazova E, Peneva P, Todorov P. Antinociceptive Effects of VV-Hemorphin-5 Peptide Analogues Containing Amino phosphonate Moiety in Mouse Formalin Model of Pain. Protein Pept Lett 2021; 28:442-449. [PMID: 32798365 DOI: 10.2174/0929866527666200813200714] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 06/19/2020] [Accepted: 06/21/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND Hemorphins are endogenous hemoglobin-derived peptides that belong to the family of "atypical" opioid peptides with both affinities to opioid receptors and ability to release other endogenous opioid peptides. OBJECTIVE In the present study, peptide analogues of Valorphin (VV-hemorphin-5) containing amino phosphonate moiety synthesized by solid-phase peptide synthesis (Fmoc-strategy) were investigated for their potential antinociceptive activities and compared to the reference VV-H in formalin- induced model of acute and inflammatory pain in mice. METHODS The hemorphin analogues were prepared by replacement of the one and/or two N-terminal Val in VV-hemorphin5 (VV-H) with ((dimethoxy phosphoryl) methyl)-L-valine and ((dimethoxy phosphoryl) methyl)-L-leucine to obtain the compounds pVV-H, pL-H, and pLV-H. Aiming to additionally prove the importance of amino acid valine, we introduced the ((dimethoxy phosphoryl) methyl)-L-leucine to the N-side of VV-hemorphin-5 (pLVV-H). The experiments were carried out on adult male ICR mice. All peptides were administered intracerebroventricularly at three doses (50, 25 and 12,5 μg/mouse). We have studied the effects of the peptides on acute (1st phase) and inflammatory (2nd phase) pain reaction using un experimental model with intraplantar formalin injection. RESULTS VV-H showed a significant antinociceptive effect both in the acute and inflammatory phases of the test. Although Valorphin hexa-, hepta-, and octapeptide analogs demonstrated a significant antinociceptive effect, they showed substantial differences considering their effective dose and the phase of the test as compared to the Valorphin. DISCUSSION Data showed that modified heptapeptides pVV-H and pLV-H exerted the same or better antinociception in acute and inflammatory pain, in comparison to the reference peptide, while pL-H and pLVV-H analogues were less effective. CONCLUSION Our study contributes to the elucidation of the role of Valine and the number of amino acid residues in the structure of hemorphin peptide analogs in their effectiveness in suppressing both acute and inflammatory experimental pain.
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Affiliation(s)
- Borislav Assenov
- Sofia University "St. Kliment Ohridski", Medical Faculty, Sofia 1407, Bulgaria
| | | | - Elena Dzhambazova
- Sofia University "St. Kliment Ohridski", Medical Faculty, Sofia 1407, Bulgaria
| | - Petia Peneva
- Department of Organic Chemistry, University of Chemical Technology and Metallurgy, Sofia 1756, Bulgaria
| | - Petar Todorov
- Department of Organic Chemistry, University of Chemical Technology and Metallurgy, Sofia 1756, Bulgaria
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Assessment of the biological activity of fish muscle protein hydrolysates using in vitro model systems. Food Chem 2021; 359:129852. [PMID: 33940471 DOI: 10.1016/j.foodchem.2021.129852] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 04/08/2021] [Accepted: 04/11/2021] [Indexed: 12/13/2022]
Abstract
The generation of biologically active fish protein hydrolysates (FPH) is a useful technique to produce value-added products with potential application in the functional food and nutraceutical industries. Fish muscle is an attractive substrate for the production of protein hydrolysates due to its rich protein content, containing 15-25% of total fish protein. This paper reviews the production of protein hydrolysates from fish muscle, most commonly via enzymatic hydrolysis, and their subsequent bioactivities including anti-obesity, immunomodulatory, antioxidant, angiotensin I-converting enzyme (ACE)-inhibitory, anti-microbial, and anti-cancer activities as measured by in vitro testing methods. Disease prevention with FPH potentially offers a safe and natural alternative to synthetic drugs. Small molecular weight (MW) FPHs generally exhibit favourable bioactivity than large MW fractions via enhanced absorption through the gastrointestinal tract. This review also discusses the relationship between amino acid (AA) composition and AA sequence of FPH and peptides and their exhibited in vitro bioactivity.
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Theysgeur S, Cudennec B, Deracinois B, Perrin C, Guiller I, Lepoudère A, Flahaut C, Ravallec R. New Bioactive Peptides Identified from a Tilapia Byproduct Hydrolysate Exerting Effects on DPP-IV Activity and Intestinal Hormones Regulation after Canine Gastrointestinal Simulated Digestion. Molecules 2020; 26:molecules26010136. [PMID: 33396793 PMCID: PMC7796187 DOI: 10.3390/molecules26010136] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 12/15/2020] [Accepted: 12/23/2020] [Indexed: 12/31/2022] Open
Abstract
Like their owners, dogs and cats are more and more affected by overweight and obesity-related problems and interest in functional pet foods is growing sharply. Through numerous studies, fish protein hydrolysates have proved their worth to prevent and manage obesity-related comorbidities like diabetes. In this work, a human in vitro static simulated gastrointestinal digestion model was adapted to the dog which allowed us to demonstrate the promising effects of a tilapia byproduct hydrolysate on the regulation of food intake and glucose metabolism. Promising effects on intestinal hormones secretion and dipeptidyl peptidase IV (DPP-IV) inhibitory activity were evidenced. We identify new bioactive peptides able to stimulate cholecystokinin (CCK) and glucagon-like peptide 1 (GLP-1) secretions, and to inhibit the DPP-IV activity after a transport study through a Caco-2 cell monolayer.
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Affiliation(s)
- Sandy Theysgeur
- UMR-T 1158, BioEcoAgro, University of Lille, F-59000 Lille, France; (S.T.); (B.D.); (C.F.)
- Diana Pet Food, F-56250 Elven, France; (C.P.); (I.G.); (A.L.)
| | - Benoit Cudennec
- UMR-T 1158, BioEcoAgro, University of Lille, F-59000 Lille, France; (S.T.); (B.D.); (C.F.)
- Correspondence: (B.C.); (R.R.); Tel.: +33-(0)362268590 (B.C. & R.R.)
| | - Barbara Deracinois
- UMR-T 1158, BioEcoAgro, University of Lille, F-59000 Lille, France; (S.T.); (B.D.); (C.F.)
| | - Claire Perrin
- Diana Pet Food, F-56250 Elven, France; (C.P.); (I.G.); (A.L.)
| | | | - Anne Lepoudère
- Diana Pet Food, F-56250 Elven, France; (C.P.); (I.G.); (A.L.)
| | - Christophe Flahaut
- UMR-T 1158, BioEcoAgro, University of Lille, F-59000 Lille, France; (S.T.); (B.D.); (C.F.)
- UMR Transfrontalière BioEcoAgro N° 1158, University of Artois, F-62000 Arras, France
| | - Rozenn Ravallec
- UMR-T 1158, BioEcoAgro, University of Lille, F-59000 Lille, France; (S.T.); (B.D.); (C.F.)
- Correspondence: (B.C.); (R.R.); Tel.: +33-(0)362268590 (B.C. & R.R.)
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Zhang C, Liu H, Chen S, Luo Y. Evaluating the effects of IADHFL on inhibiting DPP-IV activity and expression in Caco-2 cells and contributing to the amount of insulin released from INS-1 cells in vitro. Food Funct 2018; 9:2240-2250. [PMID: 29553151 DOI: 10.1039/c7fo01950e] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Dipeptidyl peptidase-IV (DPP-IV) is a serine exo-peptidase that can inactivate incretins by removing N-terminal dipeptides. Currently, inhibiting the DPP-IV activity is a common treatment for type 2 diabetes (T2D). The goal of this study is to investigate whether IADHFL, a novel DPP-IV inhibitory peptide identified from bighead carp (Hypophthalmichthys nobilis), has the potential to modulate T2D. IADHFL remained stable after simulated gastrointestinal digestion and significantly decreased the activity and expression of both soluble and membrane-bound DPP-IV after 24 h and 48 h of treatment. Intact peptide absorption was observed, but a percentage of the peptide was degraded while passing through a monolayer of Caco-2 cells. In addition, a double-layered cell model showed that the peptide could increase insulin secretion from INS-1 cells after glucose treatments of 2.8 mM and 16.7 mM. Finally, IADHFL could regulate the expression levels of genes associated with insulin secretion and T2D in INS-1 cells.
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Affiliation(s)
- Chi Zhang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 10083, China
| | - Huaigao Liu
- Beijing Guotai Biotechnology Co., Ltd, Beijing 100011, China.
| | - Shangwu Chen
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 10083, China
| | - Yongkang Luo
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 10083, China
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Domenger D, Cudennec B, Kouach M, Touche V, Landry C, Lesage J, Gosselet F, Lestavel S, Goossens JF, Dhulster P, Ravallec R. Food-Derived Hemorphins Cross Intestinal and Blood-Brain Barriers In Vitro. Front Endocrinol (Lausanne) 2018; 9:159. [PMID: 29692758 PMCID: PMC5903475 DOI: 10.3389/fendo.2018.00159] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Accepted: 03/26/2018] [Indexed: 01/08/2023] Open
Abstract
A qualitative study is presented, where the main question was whether food-derived hemorphins, i.e., originating from digested alimentary hemoglobin, could pass the intestinal barrier and/or the blood-brain barrier (BBB). Once absorbed, hemorphins are opioid receptor (OR) ligands that may interact with peripheral and central OR and have effects on food intake and energy balance regulation. LLVV-YPWT (LLVV-H4), LVV-H4, VV-H4, VV-YPWTQRF (VV-H7), and VV-H7 hemorphins that were previously identified in the 120 min digest resulting from the simulated gastrointestinal digestion of hemoglobin have been synthesized to be tested in in vitro models of passage of IB and BBB. LC-MS/MS analyses yielded that all hemorphins, except the LLVV-H4 sequence, were able to cross intact the human intestinal epithelium model with Caco-2 cells within 5-60 min when applied at 5 mM. Moreover, all hemorphins crossed intact the human BBB model with brain-like endothelial cells (BLEC) within 30 min when applied at 100 µM. Fragments of these hemorphins were also detected, especially the YPWT common tetrapeptide that retains OR-binding capacity. A cAMP assay performed in Caco-2 cells indicates that tested hemorphins behave as OR agonists in these cells by reducing cAMP production. We further provide preliminary results regarding the effects of hemorphins on tight junction proteins, specifically here the claudin-4 that is involved in paracellular permeability. All hemorphins at 100 µM, except the LLVV-H4 peptide, significantly decreased claudin-4 mRNA levels in the Caco-2 intestinal model. This in vitro study is a first step toward demonstrating food-derived hemorphins bioavailability which is in line with the growing body of evidence supporting physiological functions for food-derived peptides.
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Affiliation(s)
- Dorothée Domenger
- Université de Lille INRA, ISA, Université d’Artois, Université Littoral Côte d’Opale, EA 7394-ICV Institut Charles Viollette, Lille, France
| | - Benoit Cudennec
- Université de Lille INRA, ISA, Université d’Artois, Université Littoral Côte d’Opale, EA 7394-ICV Institut Charles Viollette, Lille, France
- *Correspondence: Benoit Cudennec, ; Rozenn Ravallec,
| | - Mostafa Kouach
- Plateau de Spectrométrie de Masse “PSM-GRITA”, EA 7365, Faculté de Pharmacie, Université de Lille, Lille, France
| | - Véronique Touche
- Université de Lille INSERM, CHU Lille, Institut Pasteur de Lille, U1011 – EGID, Lille, France
| | - Christophe Landry
- Université d’Artois EA 2465, Laboratoire de la Barrière Hémato-Encéphalique (LBHE), Lens, France
| | - Jean Lesage
- Université Lille Nord de France, Unité Environnement Périnatal et Croissance EA 4489, Équipe dénutritions maternelles périnatales, Université Lille 1, Villeneuve-d’Ascq, France
| | - Fabien Gosselet
- Université d’Artois EA 2465, Laboratoire de la Barrière Hémato-Encéphalique (LBHE), Lens, France
| | - Sophie Lestavel
- Université de Lille INSERM, CHU Lille, Institut Pasteur de Lille, U1011 – EGID, Lille, France
| | - Jean-François Goossens
- Plateau de Spectrométrie de Masse “PSM-GRITA”, EA 7365, Faculté de Pharmacie, Université de Lille, Lille, France
| | - Pascal Dhulster
- Université de Lille INRA, ISA, Université d’Artois, Université Littoral Côte d’Opale, EA 7394-ICV Institut Charles Viollette, Lille, France
| | - Rozenn Ravallec
- Université de Lille INRA, ISA, Université d’Artois, Université Littoral Côte d’Opale, EA 7394-ICV Institut Charles Viollette, Lille, France
- *Correspondence: Benoit Cudennec, ; Rozenn Ravallec,
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Nongonierma AB, FitzGerald RJ. Features of dipeptidyl peptidase IV (DPP-IV) inhibitory peptides from dietary proteins. J Food Biochem 2017; 43:e12451. [PMID: 31353485 DOI: 10.1111/jfbc.12451] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 09/29/2017] [Accepted: 09/30/2017] [Indexed: 01/14/2023]
Abstract
Dipeptidyl peptidase IV (DPP-IV) is involved in incretin hormone processing and therefore plays a key role in glycemic regulation. This review summarizes the latest developments in food protein-derived DPP-IV inhibitory peptides. The in silico approaches currently used to develop targeted strategies for the enzymatic release of DPP-IV inhibitory peptides from food proteins are outlined. The features within the primary sequences of potent DPP-IV inhibitory di-, tri-, and larger peptides, having half maximal inhibitory activity (IC50 ) < 100 µM, were evaluated and the outcomes are presented herein. It is proposed that detailed analysis of those food derived peptides identified in humans following ingestion may constitute a practical strategy for the targeted identification of novel bioavailable DPP-IV inhibitory peptides. Human intervention studies are required as the specific role of food protein-derived DPP-IV inhibitory peptides in the regulation of glycaemia in humans remains to be fully elucidated. PRACTICAL APPLICATIONS: This review provides recent information on dipeptidyl peptidase IV (DPP-IV) inhibitory peptides arising from food protein hydrolysates. Small animal studies have demonstrated that food protein hydrolysates with in vitro DPP-IV inhibitory properties also display antidiabetic activity. DPP-IV inhibitory peptides may be used as food ingredients to improve glycemic regulation in Type 2 diabetics. Therefore, the development of potent DPP-IV inhibitory hydrolysates containing bioavailable peptides in humans is of significant interest. This may help in the formulation of foods containing physiologically relevant doses of bioactive hydrolysates/peptides. Acquisition of detailed knowledge of DPP-IV inhibitory peptide features via the utilization of in silico tools may help to optimize the release of potent DPP-IV inhibitory peptides during enzymatic hydrolysis of food proteins. This review provides information on features within the primary sequences of potent DPP-IV inhibitory peptides and current in silico strategies which may be used to inform on the targeted enzymatic hydrolysis of food proteins.
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Affiliation(s)
- Alice B Nongonierma
- Department of Biological Sciences and Food for Health Ireland (FHI), University of Limerick, Limerick, Ireland
| | - Richard J FitzGerald
- Department of Biological Sciences and Food for Health Ireland (FHI), University of Limerick, Limerick, Ireland
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