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https://www.readbyqxmd.com/read/29218344/generation-of-dipeptidyl-peptidase-iv-dpp-iv-inhibitory-peptides-during-the-enzymatic-hydrolysis-of-tropical-banded-cricket-gryllodes-sigillatus-proteins
#1
Alice B Nongonierma, Candice Lamoureux, Richard J FitzGerald
Tropical banded crickets (Gryllodes sigillatus) were studied for their ability to yield hydrolysates with dipeptidyl peptidase IV (DPP-IV) inhibitory properties. A cricket protein isolate (CPI) was prepared following extraction of the water soluble proteins from G. sigillatus powder (CP). The extraction yield and purity were 20.90 ± 0.35% and 57.0 ± 2.23%, respectively. Endogenous proteinase activities were detected in the CP, which were linked to the significant protein breakdown seen in this sample. Fifteen CPI hydrolysates (H1-H15) were generated with Protamex™ using a design of experiments (DOE) approach combining three parameters, temperature (40, 50 and 60 °C), enzyme to substrate ratio (E : S, 0...
December 8, 2017: Food & Function
https://www.readbyqxmd.com/read/29207547/predicted-release-and-analysis-of-novel-ace-i-renin-and-dpp-iv-inhibitory-peptides-from-common-oat-avena-sativa-protein-hydrolysates-using-in-silico-analysis
#2
Stephen Bleakley, Maria Hayes, Nora O' Shea, Eimear Gallagher, Tomas Lafarga
The renin-angiotensin-aldosterone system (RAAS) plays an important role in regulating hypertension by controlling vasoconstriction and intravascular fluid volume. RAAS itself is largely regulated by the actions of renin (EC 3.4.23.15) and the angiotensin-I-converting enzyme (ACE-I; EC 3.4.15.1). The enzyme dipeptidyl peptidase-IV (DPP-IV; EC 3.4.14.5) also plays a role in the development of type-2 diabetes. The inhibition of the renin, ACE-I, and DPP-IV enzymes has therefore become a key therapeutic target for the treatment of hypertension and diabetes...
December 4, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/29201861/active-phytochemicals-of-pueraria-tuberosa-for-dpp-iv-inhibition-in-silico-and-experimental-approach
#3
Shivani Srivastava, Priya Shree, Yamini Bhusan Tripathi
Background: We had earlier reported that the extract of Pueraria tuberosa significantly inhibits DPP-IV enzyme, resulting in glucose tolerance response in rats. In this study, we have explored the active phytochemicals responsible for this potential. The results have been validated in both fasting and postprandial states in the plasma of normal rats and also in fasting blood and intestinal homogenates of diabetic models. Methods: Pueraria tuberosa water extract (PTWE) was administered to normal Charles Foster rats for 35 days and to diabetic model (65 mg/kg bw) for 10 days...
2017: Journal of Diabetes and Metabolic Disorders
https://www.readbyqxmd.com/read/29190734/a-novel-porphyromonas-gingivalis-enzyme-an-atypical-dipeptidyl-peptidase-iii-with-an-arm-repeat-domain
#4
Altijana Hromić-Jahjefendić, Nina Jajčanin Jozić, Saša Kazazić, Marina Grabar Branilović, Zrinka Karačić, Jörg H Schrittwieser, Krishna Mohan Padmanabha Das, Marko Tomin, Monika Oberer, Karl Gruber, Marija Abramić, Sanja Tomić
Porphyromonas gingivalis, an asaccharolytic Gram-negative oral anaerobe, is a major pathogen associated with adult periodontitis, a chronic infective disease that a significant percentage of the human population suffers from. It preferentially utilizes dipeptides as its carbon source, suggesting the importance of dipeptidyl peptidase (DPP) types of enzyme for its growth. Until now DPP IV, DPP5, 7 and 11 have been extensively investigated. Here, we report the characterization of DPP III using molecular biology, biochemical, biophysical and computational chemistry methods...
2017: PloS One
https://www.readbyqxmd.com/read/29181153/efficacy-of-alogliptin-combined-with-motor-imagery-under-hyperbaric-oxygen-in-diabetic-nephropathy-with-silent-cerebral-infarction
#5
Danyan Chen, Xiaolong Huang, Hua Gan, Xiaogang Du, Song Lu, Rongxi Huang, Ke Liu, Binghan Zhang
In the present study, we evaluated the curative effect of dipeptidyl peptidase-IV (DPP-IV) inhibitor alogliptin combined with motor imagery under hyperbaric oxygen in diabetic nephropathy (DN) with silent cerebral infarction (SCI). Two-hundred newly diagnosed DN patients with and without SCI were included. The SCI patients were divided into two treatment groups: Alogliptin (A group, n=50) and alogliptin combined with motor imagery under hyperbaric oxygen (B group, n=50). The degrees of neurocognitive dysfunction were evaluated at baseline and after 6 months of treatment...
November 2017: Biomedical Reports
https://www.readbyqxmd.com/read/29172693/ephedrine-as-a-lead-compound-for-the-development-of-new-dpp-iv-inhibitors
#6
María José Ojeda-Montes, Andrea Ardid-Ruiz, Sarah Tomás-Hernández, Aleix Gimeno, Adrià Cereto-Massagué, Raúl Beltrán-Debón, Miquel Mulero, Santiago Garcia-Vallvé, Gerard Pujadas, Cristina Valls
AIM: Extracts from Ephedra species have been reported to be effective as antidiabetics. A previous in silico study predicted that ephedrine and five ephedrine derivatives could contribute to the described antidiabetic effect of Ephedra extracts by inhibiting dipeptidyl peptidase IV (DPP-IV). Finding selective DPP-IV inhibitors is a current therapeutic strategy for Type 2 diabetes mellitus management. Therefore, the main aim of this work is to experimentally determine whether these alkaloids are DPP-IV inhibitors...
November 27, 2017: Future Medicinal Chemistry
https://www.readbyqxmd.com/read/29156154/coconut-phytocompounds-inhibits-polyol-pathway-enzymes-implication-in-prevention-of-microvascular-diabetic-complications
#7
Devi Lekshmi Sheela, Puthiyaveetil Abdulla Nazeem, Arunaksharan Narayanankutty, R Muthangaparambil Shylaja, Sangeetha P Davis, Priyanga James, Ravisankar Valsalan, Thekkekara Devassy Babu, Achuthan C Raghavamenon
Coconut oil (CO), the primary choice of cooking purposes in the south Asian countries, is rich in medium chain saturated fatty acids, especially lauric acid (50-52%). The oil has high medicinal use in Ayurvedic system and known to contain polyphenolic antioxidants. Studies have reported that CO improves insulin sensitivity and shows hypoglycemic effect. However, there is no information regarding its effect on chronic diabetic complications including retinopathy and nephropathy is available. The secondary diabetic complications are mediated by the activation of polyol pathway, where aldose reductase (AR) plays crucial role...
December 2017: Prostaglandins, Leukotrienes, and Essential Fatty Acids
https://www.readbyqxmd.com/read/29154902/dipeptidyl-peptidase-iv-dpp-iv-inhibition-prevents-fibrosis-in-adipose-tissue-of-obese-mice
#8
Ana Patrícia Marques, Janete Cunha-Santos, Helena Leal, Lígia Sousa-Ferreira, Luís Pereira de Almeida, Cláudia Cavadas, Joana Rosmaninho-Salgado
BACKGROUND: During the development of obesity the expansion of white adipose tissue (WAT) leads to a dysregulation and an excessive remodeling of extracellular matrix (ECM), leading to fibrosis formation. These ECM changes have high impact on WAT physiology and may change obesity progression. Blocking WAT fibrosis may have beneficial effects on the efficacy of diet regimen or therapeutical approaches in obesity. Since dipeptidyl peptidase IV (DPP-IV) inhibitors prevent fibrosis in tissues, such as heart, liver and kidney, the objective of this study was to assess whether vildagliptin, a DPP-IV inhibitor, prevents fibrosis in WAT in a mouse model of obesity, and to investigate the mechanisms underlying this effect...
November 14, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29120791/identification-of-novel-dipeptidyl-peptidase-iv-dpp-iv-inhibitory-peptides-in-camel-milk-protein-hydrolysates
#9
Alice B Nongonierma, Sara Paolella, Priti Mudgil, Sajid Maqsood, Richard J FitzGerald
Nine novel dipeptidyl peptidase IV (DPP-IV) inhibitory peptides (FLQY, FQLGASPY, ILDKEGIDY, ILELA, LLQLEAIR, LPVP, LQALHQGQIV, MPVQA and SPVVPF) were identified in camel milk proteins hydrolysed with trypsin. This was achieved using a sequential approach combining liquid chromatography tandem mass spectrometry (LC-MS/MS), qualitative/quantitative structure activity relationship (QSAR) and confirmatory studies with synthetic peptides. The most potent camel milk protein-derived DPP-IV inhibitory peptides, LPVP and MPVQA, had DPP-IV half maximal inhibitory concentrations (IC50) of 87...
April 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29096438/exploration-of-potentially-bioactive-peptides-generated-from-the-enzymatic-hydrolysis-of-hempseed-proteins
#10
Gilda Aiello, Carmen Lammi, Giovanna Boschin, Chiara Zanoni, Anna Arnoldi
The seed of industrial hemp is an underexploited protein source. In view of a possible use in functional foods, a hempseed protein concentrate was hydrolyzed with pepsin, trypsin, pancreatin, or a mixture of these enzymes. A detailed peptidomic analysis using data-dependent acquisition showed that the numbers of peptides identified ranged from 90 belonging to 33 parent proteins in the peptic hydrolysate to 9 belonging to 6 proteins in the pancreatin digest. The peptic and tryptic hydrolysates resulted to be the most efficient inhibitors of 3-hydroxymethyl-coenzyme A reductase activity, when tested on the catalytic domain of the enzyme...
November 2, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29095153/periplasmic-form-of-dipeptidyl-aminopeptidase-iv-from-pseudoxanthomonas-mexicana-wo24-purification-kinetic-characterization-crystallization-and-x-ray-crystallographic-analysis
#11
Saori Roppongi, Chika Tateoka, Mayu Fujimoto, Ippei Iizuka, Saori Morisawa, Akihiro Nakamura, Nobuyuki Honma, Yoshiyuki Suzuki, Yosuke Shida, Wataru Ogasawara, Nobutada Tanaka, Yasumitsu Sakamoto, Takamasa Nonaka
Dipeptidyl aminopeptidase IV (DAP IV or DPP IV) from Pseudoxanthomonas mexicana WO24 (PmDAP IV) preferentially cleaves substrate peptides with Pro or Ala at the P1 position [NH2-P2-P1(Pro/Ala)-P1'-P2'…]. For crystallographic studies, the periplasmic form of PmDAP IV was overproduced in Escherichia coli, purified and crystallized in complex with the tripeptide Lys-Pro-Tyr using the hanging-drop vapour-diffusion method. Kinetic parameters of the purified enzyme against a synthetic substrate were also determined...
November 1, 2017: Acta Crystallographica. Section F, Structural Biology Communications
https://www.readbyqxmd.com/read/29055144/increased-prevalence-of-diabetes-mellitus-in-bullous-pemphigoid-patients-during-the-last-decade
#12
Luca Fania, Giovanni Di Zenzo, Biagio Didona, Maria Antonietta Pilla, Luciano Sobrino, Annarita Panebianco, Cinzia Mazzanti, Damiano Abeni
Bullous pemphigoid (BP) is a rare autoimmune blistering disease. The association between BP and diabetes mellitus (DM) has been previously reported with inconsistent results(1-4) . Dipeptidyl peptidase (DPP)-IV inhibitors, approved in Europe by EMA in 2007 to treat type-2 DM, are antihyperglycemic drugs that could induce BP disease(5-9) . This article is protected by copyright. All rights reserved.
October 21, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/29027968/rapid-identification-of-dipeptidyl-peptidase-iv-dpp-iv-inhibitory-peptides-from-ruditapes-philippinarum-hydrolysate
#13
Rui Liu, Lei Zhou, Yan Zhang, Nai-Juan Sheng, Zhi-Kang Wang, Ti-Zhi Wu, Xin-Zhi Wang, Hao Wu
Dipeptidyl peptidase-IV (DPP-IV) inhibitory peptides were rapidly identified from Ruditapes philippinarum hydrolysate. The hydrolysate was fractionated by ethanol precipitation and preparative reverse phase high-performance liquid chromatography (RP-HPLC). The fraction which showed the highest DPP-IV inhibitory activity was then analyzed by a high-throughput nano-liquid chromatography electrospray ionization tandem mass spectrometry (nano-LC ESI-MS/MS) method, and the sequences of peptides were identified based on the MS/MS spectra against the Mollusca protein data from the UniProt database...
October 13, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29022103/antidiabetic-plant-derived-nutraceuticals-a-critical-review
#14
REVIEW
Jayapal Naveen, Vallikannan Baskaran
Diabetes mellitus (DM) is one of the major health problems in the world, especially amongst the urban population. Chemically synthesized drugs used to decrease the ill effects of DM and its secondary complications cause adverse side effects, viz., weight gain, gastrointestinal disturbances, and heart failure. Currently, various other approaches, viz., diet control, physical exercise and use of antidiabetic plant-derived molecules/foods are advocated to manage DM, as they are economical with fewer or no side effects...
October 11, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28915418/purification-identification-and-molecular-mechanism-of-two-dipeptidyl-peptidase-iv-dpp-iv-inhibitory-peptides-from-antarctic-krill-euphausia-superba-protein-hydrolysate
#15
Wei Ji, Chaohua Zhang, Hongwu Ji
Dipeptidyl peptidase IV (DPP-IV) played an important role in blood glucose regulation. Inhibition of DPP-IV may improve glycemic control in diabetics by preventing the rapid breakdown of incretin hormones and prolonging their physiological action. In this study, Antarctic krill (Euphausia superba) protein was hydrolyzed using animal proteolytic enzymes. The hydrolysate was purified sequentially by ultrafiltration, gel filtration chromatography and reversed phase high-performance liquid chromatography (RP-HPLC)...
October 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28892258/sitagliptin-and-roux-en-y-gastric-bypass-modulate-insulin-secretion-via-regulation-of-intra-islet-pyy
#16
Claudia Guida, Laura J McCulloch, Mahdieh Godazgar, Sam D Stephen, Charlotte Baker, Davide Basco, Jiawen Dong, Duan Chen, Anne Clark, Reshma D Ramracheya
AIMS: The gut hormone peptide tyrosine tyrosine (PYY) is critical for maintaining islet integrity and restoring islet function following Roux-en-Y gastric bypass (RYGB). The expression of PYY and its receptors (NPYRs) in islets has been documented but not fully characterized. Modulation of islet PYY by the proteolytic enzyme dipeptidyl peptidase IV (DPP-IV) has not been investigated and the impact of DPP-IV inhibition on islet PYY function remains unexplored. Here we have addressed these gaps and their effects on glucose-stimulated insulin secretion (GSIS)...
September 11, 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28873669/peptide-identification-in-a-salmon-gelatin-hydrolysate-with-antihypertensive-dipeptidyl-peptidase-iv-inhibitory-and-antioxidant-activities
#17
Adriana C Neves, Pádraigín A Harnedy, Martina B O'Keeffe, Monisola A Alashi, Rotimi E Aluko, Richard J FitzGerald
Salmon gelatin (Salmo salar, SG) enzymatic hydrolysates were generated using Alcalase 2.4L, Alcalase 2.4L in combination with Flavourzyme 500L, Corolase PP, Promod 144MG and Brewer's Clarex. The hydrolysate generated with Corolase PP for 1h (SG-C1) had the highest angiotensin converting enzyme (ACE, IC50=0.13±0.05mgmL(-1)) and dipeptidyl peptidase IV (DPP-IV, IC50=0.08±0.01mgmL(-1)) inhibitory activities, and oxygen radical absorbance capacity (ORAC, 540.94±9.57μmolTEg(-1)d.w.). The in vitro bioactivities of SG-C1 were retained following simulated gastrointestinal digestion...
October 2017: Food Research International
https://www.readbyqxmd.com/read/28873655/proteomic-analysis-of-sweet-algerian-apricot-kernels-prunus-armeniaca-l-by-combinatorial-peptide-ligand-libraries-and-lc-ms-ms
#18
Hamida Ghorab, Carmen Lammi, Anna Arnoldi, Zahia Kabouche, Gilda Aiello
An investigation on the proteome of the sweet kernel of apricot, based on equalisation with combinatorial peptide ligand libraries (CPLLs), SDS-PAGE, nLC-ESI-MS/MS, and database search, permitted identifying 175 proteins. Gene ontology analysis indicated that their main molecular functions are in nucleotide binding (20.9%), hydrolase activities (10.6%), kinase activities (7%), and catalytic activity (5.6%). A protein-protein association network analysis using STRING software permitted to build an interactomic map of all detected proteins, characterised by 34 interactions...
January 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28830875/influences-of-breakfast-on-clock-gene-expression-and-postprandial-glycemia-in-healthy-individuals-and-individuals-with-diabetes-a-randomized-clinical-trial
#19
Daniela Jakubowicz, Julio Wainstein, Zohar Landau, Itamar Raz, Bo Ahren, Nava Chapnik, Tali Ganz, Miriam Menaged, Maayan Barnea, Yosefa Bar-Dayan, Oren Froy
OBJECTIVE: The circadian clock regulates glucose metabolism by mediating the activity of metabolic enzymes, hormones, and transport systems. Breakfast skipping and night eating have been associated with high HbA1c and postprandial hyperglycemia after lunch and dinner. Our aim was to explore the acute effect of breakfast consumption or omission on glucose homeostasis and clock gene expression in healthy individuals and individuals with type 2 diabetes. RESEARCH DESIGN AND METHODS: In a crossover design, 18 healthy volunteers and 18 volunteers with 14...
November 2017: Diabetes Care
https://www.readbyqxmd.com/read/28777292/influence-of-a-virgin-olive-oil-versus-butter-plus-cholesterol-enriched-diet-on-testicular-enzymatic-activities-in-adult-male-rats
#20
Germán Domínguez-Vías, Ana Belén Segarra, Magdalena Martínez-Cañamero, Manuel Ramírez-Sánchez, Isabel Prieto
The aim of the present work was to improve our knowledge on the mechanisms underlying the beneficial or deleterious effects on testicular function of the so-called Mediterranean and Western diet by analyzing glutamyl aminopeptidase (GluAP), gamma glutamyl transpeptidase (GGT) and dipeptidyl peptidase IV (DPP IV) activities in testis, as enzymes involved in testicular function. Male Wistar rats (6 months old) were fed for 24 weeks with three different diets: standard (S), an S diet supplemented with virgin-olive-oil (20%) (VOO), or a S diet enriched with butter (20%) plus cholesterol (0...
August 4, 2017: International Journal of Molecular Sciences
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