keyword
MENU ▼
Read by QxMD icon Read
search

peptides

keyword
https://www.readbyqxmd.com/read/29667908/the-macula-densa-prorenin-receptor-is-essential-in-renin-release-and-blood-pressure-control
#1
Anne D M Riquier-Brison, Arnold Sipos, Ágnes Prókai, Sarah L Vargas, Ildiko Toma, Elliott J Meer, Karie G Villanueva, Jennifer C M Chen, Georgina Gyarmati, Christopher Yih, Elaine Tang, Bahram Nadim, Sujith Pendekanti, Ingrid M Garrelds, Genevieve Nguyen, A H Jan Danser, Janos Peti-Peterdi
The prorenin receptor (PRR) was originally proposed to be a member of the renin-angiotensin system (RAS), however recent work questioned their association. The present paper describes a functional link between the PRR and RAS in the renal juxtaglomerular apparatus (JGA), a classic anatomical site of the RAS. PRR expression was found in the sensory cells of the JGA, the macula densa (MD), and immunohistochemistry localized PRR to the MD basolateral cell membrane in mouse, rat, and human kidneys. MD cell PRR activation led to MAP kinase ERK1/2 signaling and stimulation of PGE2 release, the classic pathway of MD-mediated renin release...
April 18, 2018: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29667836/molecular-dynamics-simulations-are-redefining-our-view-of-peptides-interacting-with-biological-membranes
#2
Jakob P Ulmschneider, Martin B Ulmschneider
Ever since the first molecular mechanics computer simulations of biological molecules became possible, there has been the dream to study all complex biological phenomena in silico, simply bypassing the enormous experimental challenges and their associated costs. For this, two inherent requirements need to be met: First, the time scales achievable in simulations must reach up to the millisecond range and even longer. Second, the computational model must accurately reproduce what is measured experimentally. Despite some recent successes, the general consensus in the field to date has been that neither of these conditions have yet been met and that the dream will be realized, if at all, only in the distant future...
April 18, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29667747/self-assembled-cyclic-structures-from-copper-ii-peptoids
#3
Totan Ghosh, Natalia Fridman, Monica Kosa, Galia Maayan
Metal-ligand coordination is a key interaction in the self-assembly of biopolymers. Although binding of metal ions to synthetic proteins and peptides is known to yield high-order structures, self-assembly of peptidomimetic molecules upon metal binding is still challenging. Herein we explore the self-assembly of three peptoid trimers 3, 3A and 3B, bearing a bipyridine ligand at their C-terminus, a benzyl group at their N-terminus and a polar group (N-ethyl-R) in the middle position (R = OH, OCH3 and NH2, respectively) by Cu2+ coordination...
April 18, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29667727/stimuli-responsive-peptide-gels-and-some-bio-applications
#4
Natashya Falcone, Heinz-Bernhard Kraatz
Supramolecular gels are a fascinating class of soft materials that have attracted significant attention in recent years. They are composed of small molecule gelators that assemble into supramolecular network structures. The resulting space is filled with solvent. Some gel materials are able to respond to various stimuli making them attractive drug delivery vehicles and as matrices for tissue regeneration. Peptide based gel materials are particularly attractive as they possess numerous advantages including biocompatibility and biodegradability...
April 18, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29667686/rheological-characterization-of-dynamic-remodeling-of-the-pericellular-region-by-human-mesenchymal-stem-cell-secreted-enzymes-in-well-defined-synthetic-hydrogel-scaffolds
#5
Maryam Daviran, Sarah M Longwill, Jonah F Casella, Kelly M Schultz
Human mesenchymal stem cells (hMSCs) dynamically remodel their microenvironment during basic processes, such as migration and differentiation. Migration requires extracellular matrix invasion, necessitating dynamic cell-material interactions. Understanding these interactions is critical to advancing materials designs that harness and manipulate these processes for applications including wound healing and tissue regeneration. In this work, we encapsulate hMSCs in a cell-degradable poly(ethylene glycol)-peptide hydrogel to determine how cell-secreted enzymes, specifically matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs), create unique pericellular microenvironments...
April 18, 2018: Soft Matter
https://www.readbyqxmd.com/read/29667660/a-new-functional-membrane-protein-microarray-based-on-tethered-phospholipid-bilayers
#6
Meriem Chadli, Ofelia Maniti, Christophe Marquette, Bruno Tillier, Sandra Cortès, Agnès Girard-Egrot
A new prototype of a membrane protein biochip is presented in this article. This biochip was created by the combination of novel technologies of peptide-tethered bilayer lipid membrane (pep-tBLM) formation and solid support micropatterning. Pep-tBLMs integrating a membrane protein were obtained in the form of microarrays on a gold chip. The formation of the microspots was visualized in real-time by surface plasmon resonance imaging (SPRi) and the functionality of a GPCR (CXCR4), reinserted locally into microwells, was assessed by ligand binding studies...
April 18, 2018: Analyst
https://www.readbyqxmd.com/read/29667555/synthesis-cytotoxicity-and-antioxidant-activity-of-new-analogues-of-rc-121-synthetic-derivatives-of-somatostatin
#7
Diana Wesselinova, Emilia D Naydenova, S Staykova, I G Goshev, L Vezenkov
BACKGROUND: Based on the structure of RC-121 (D-Phe-c (Cys-Tyr-D-Trp-Lys-Val-Cys)-Thr-NH2, - synthetic derivatives of somatostatin), some analogs were synthesized and tested for in vitro cytotoxic and antioxidant activity. OBJECTIVES: The new analogs were modifyed at position 5 with Dap (diaminopropanoic acid), Dab (diaminobutanoic acid) and Orn and at position 6 with the unnatural amino acids Tle (t-leucine). METHODS: The in vitro cytotoxic effects of the substances were investigated against a panel of human tumor cell lines HT-29 (human colorectal cancer cell line), MDA-MB-23 (human breast cancer cell line), Hep G-2 (human hepatocellular carcinoma cell line) and HeLa (cervical cancer cell line)...
April 17, 2018: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/29667480/the-human-gut-microbiota-metabolism-and-perspective-in-obesity
#8
Aline Corado Gomes, Christian Hoffmann, João Felipe Mota
The gut microbiota has been recognized as an important factor in the development of metabolic diseases such as obesity and is considered an endocrine organ involved in the maintenance of energy homeostasis and host immunity. Dysbiosis can change the functioning of the intestinal barrier and the gut-associated lymphoid tissues (GALT) by allowing the passage of structural components of bacteria, such as lipopolysaccharides (LPS), which activate inflammatory pathways that may contribute to the development of insulin resistance...
April 18, 2018: Gut Microbes
https://www.readbyqxmd.com/read/29667478/retro-inverso-follicle-stimulating-hormone-peptide-mediated-polyethylenimine-complexes-for-targeted-ovarian-cancer-gene-therapy
#9
Mengyu Zhang, Mingxing Zhang, Jing Wang, Qingqing Cai, Ran Zhao, Yi Yu, Haiyan Tai, Xiaoyan Zhang, Congjian Xu
BACKGROUND: The development of nanoparticle drug delivery systems with targeted ligands has the potential to increase treatment efficiency in ovarian cancer. METHODS: We developed a 21-amino acid peptide, YTRDLVYGDPARPGIQGTGTF (L-FP21) conjugated to polyethylenimine (PEI) and methoxy polyethylene glycol (mPEG) to prepare a nanoparticle drug vehicle to target follicle-stimulating hormone receptor (FSHR) in ovarian cancer. At the same time, we optimized the ligand of the nanoparticle vehicle using D-peptides, which consist of D-amino acids (D-FP21)...
November 2018: Drug Delivery
https://www.readbyqxmd.com/read/29667406/identification-of-novel-bioactive-peptides-with-%C3%AE-amylase-inhibitory-potential-from-enzymatic-protein-hydrolysates-of-red-seaweed-porphyra-spp
#10
Habtamu Admassu, Mohammed A A Gasmalla, Ruijin Yang, Wei Zhao
Inhibition of α-amylase enzyme is one therapeutic approach in lowering glucose level in the blood to manage diabetes mellitus. In this study α-amylase inhibitory peptides were identified from proteolytic enzymes hydrolysates of red seaweed laver (Porphyra species) using consecutive chromatographic techniques. In the resultant fractions from RP-HPLC (D1-10), D2 inhibited α-amylase activity (88.67 ± 1.05 %) significantly (p ≤ 0.5) at 1mg/mL protein concentration. A mass spectrometry (ESI-Q-TOF- MS) analysis was used to identify peptides from this fraction...
April 18, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29667356/early-identification-of-acute-heart-failure-at-the-time-of-presentation-do-natriuretic-peptides-make-the-difference
#11
Martin Möckel, Stephan von Haehling, Jörn O Vollert, Jan C Wiemer, Stefan D Anker, Alan Maisel
BACKGROUND: The early identification of patients with acute heart failure (AHF) is challenging as many other diseases lead to a clinical presentation with dyspnea. AIM: The aim of the study was to evaluate the impact of natriuretic peptides at common HF study cut-offs on the diagnosis of patients with dyspnea at admission. METHODS AND RESULTS: For this post hoc analysis, we analysed n = 726 European Union (EU) patients from the prospective BACH (Biomarkers in Acute Heart Failure) study...
April 18, 2018: ESC Heart Failure
https://www.readbyqxmd.com/read/29667244/the-effects-of-atrad52-overexpression-on-homologous-recombination-in-arabidopsis
#12
Aviva Samach, Vyacheslav Gurevich, Naomi Avivi-Ragolsky, Avraham A Levy
AtRad52 homologs are involved in DNA recombination and repair but their precise functions in different homologous recombination pathways or in gene-targeting have not been analyzed. In order to facilitate our analyses, we generated an AtRad52-1A variant that had a stronger nuclear localization than the native gene thanks to the removal of the transit peptide for mitochondrial localization and to the addition of a nuclear localization signal. Overexpression of this variant increased homologous recombination in the nucleus, compared to the native AtRad52-1A: it increased Intra-Chromosomal Recombination and Synthesis-Dependent Strand-Annealing homologous recombination repair rates; but conversely, it repressed the Single-Strand Annealing pathway...
April 18, 2018: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/29667232/the-pleiotropic-cardiovascular-effects-of-dipeptidyl-peptidase-4-inhibitors
#13
REVIEW
Angelo Avogaro, Gian Paolo Fadini
Patients with Type 2 Diabetes have an excess risk for cardiovascular disease. One of the several approaches, included in the Guidelines for the management of Type 2 Diabetes, is based on dipeptidyl peptidase 4 (DPP-4; also termed CD26) inhibitors (DPP-4-I), also called gliptins. Gliptins inhibit the degradation of glucagon-like peptide-1 GLP-1RA: this effect is associated with increased circulating insulin-to-glucagon ratio, and a consequent reduction of HbA1c. Beside incretin hormones, there are several proteins that may be affected by DPP-4 and its inhibition: among these some are relevant for the cardiovascular system homeostasis such as SDF-1α and its receptor CXCR4, brain natriuretic peptides, neuropeptide Y, and peptide YY...
April 17, 2018: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/29667205/application-of-heparin-collagen-redv-selective-active-interface-on-eptfe-films-to-enhance-endothelialization-and-anticoagulation
#14
Yaping Shan, Bing Jia, Ming Ye, Hua Shen, Weicheng Chen, Huifeng Zhang
Expanded polytetrafluoroethylene (ePTFE) prosthetic valves have been widely used in clinical applications in Asian countries. However, these valves still have limits with regard to thrombosis, neointimal hyperplasia, restenosis, and valvar vegetation. The achievement of in situ endothelialization on implant materials is a promising way to overcome those limits. Here, heparin/collagen multilayers were fabricated on ePTFE films via a layer-by-layer (LBL) self-assembly technique, and then, the endothelial cell (EC) adhesive peptide sequence Arg-Glu-Asp-Val (REDV) was immobilized on the multilayers...
April 18, 2018: Artificial Organs
https://www.readbyqxmd.com/read/29667164/exploring-the-sea-urchin-neuropeptide-landscape-by-mass-spectrometry
#15
Eric B Monroe, Suresh P Annangudi, Andinet A Wadhams, Timothy A Richmond, Ning Yang, Bruce R Southey, Elena V Romanova, Liliane Schoofs, Geert Baggerman, Jonathan V Sweedler
Neuropeptides are essential cell-to-cell signaling messengers and serve important regulatory roles in animals. Although remarkable progress has been made in peptide identification across the Metazoa, for some phyla such as Echinodermata, limited neuropeptides are known and even fewer have been verified on the protein level. We employed peptidomic approaches using bioinformatics and mass spectrometry (MS) to experimentally confirm 23 prohormones and to characterize a new prohormone in nervous system tissue from Strongylocentrotus purpuratus, the purple sea urchin...
April 17, 2018: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/29667161/diversity-of-neuropeptide-cell-cell-signaling-molecules-generated-by-proteolytic-processing-revealed-by-neuropeptidomics-mass-spectrometry
#16
Vivian Hook, Christopher B Lietz, Sonia Podvin, Tomas Cajka, Oliver Fiehn
Neuropeptides are short peptides in the range of 3-40 residues that are secreted for cell-cell communication in neuroendocrine systems. In the nervous system, neuropeptides comprise the largest group of neurotransmitters. In the endocrine system, neuropeptides function as peptide hormones to coordinate intercellular signaling among target physiological systems. The diversity of neuropeptide functions is defined by their distinct primary sequences, peptide lengths, proteolytic processing of pro-neuropeptide precursors, and covalent modifications...
April 17, 2018: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/29667149/three-dimensional-reconstructed-eccrine-sweat-glands-with-vascularization-and-cholinergic-and-adrenergic-innervation
#17
Mingjun Zhang, Haihong Li, Liyun Chen, Shuhua Fang, Sitian Xie, Changmin Lin
Functional integrity of the regenerated tissues requires not only structural integrity but also vascularization and innervation. We previously demonstrated that the three-dimensional (3D) reconstructed eccrine sweat glands had similar structures as those of the native ones did, but whether the 3D reconstructed glands possessing vascularization and innervation was still unknown. In the study, Matrigel-embedded eccrine sweat gland cells were implanted under the inguinal skin. Ten weeks post-implantation, the vascularization, and innervation in the 10-week reconstructed eccrine sweat glands and native human eccrine sweat glands were detected by immunofluorescence staining...
April 17, 2018: Journal of Molecular Histology
https://www.readbyqxmd.com/read/29667130/beneficial-effects-of-the-calcium-channel-blocker-ctk-01512-2-in-a-mouse-model-of-multiple-sclerosis
#18
Rodrigo B M Silva, Samuel Greggio, Gianina T Venturin, Jaderson C da Costa, Marcus V Gomez, Maria M Campos
Voltage-gated calcium channels (VGCCs) play a critical role in neuroinflammatory diseases, such as multiple sclerosis (MS). CTK 01512-2 is a recombinant version of the peptide Phα1β derived from the spider Phoneutria nigriventer, which inhibits N-type VGCC/TRPA1-mediated calcium influx. We investigated the effects of this molecule in the mouse model of experimental autoimmune encephalomyelitis (EAE). The effects of CTK 01512-2 were compared to those displayed by ziconotide-a selective N-type VGCC blocker clinically used for chronic pain-and fingolimod-a drug employed for MS treatment...
April 17, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29667023/liraglutide-effects-on-upper-gastrointestinal-investigations-implications-prior-to-bariatric-surgery
#19
Renuca Modi, Peter Rye, Sarah Cawsey, Daniel W Birch, Arya M Sharma
Liraglutide is a glucagon-like peptide type 1 (GLP-1) analogue that is approved for long-term obesity management in North America. While bariatric surgery remains the gold standard for weight loss, an increasing number of patients are on liraglutide in the setting of ongoing workup for bariatric surgery. The presence of gastrointestinal symptoms prior to bariatric surgery may prompt testing for dysmotility, which affects surgical decision making. Here we report six cases where treatment with liraglutide was associated with reversible reduction in gastric and esophageal motility in screening for bariatric surgery...
April 17, 2018: Obesity Surgery
https://www.readbyqxmd.com/read/29667019/what-is-new-in-heart-failure-management-in-2017-update-on-acc-aha-heart-failure-guidelines
#20
REVIEW
Biykem Bozkurt
PURPOSE OF REVIEW: The goal of this paper is to provide a summary of the new recommendations in the most recent 2017 ACC/AHA/HFSA Focused Update of the 2013 ACCF/AHA Guideline for the Management of Heart Failure: A Report of the American College of Cardiology/American Heart Association Task Force on Clinical Practice Guidelines and the Heart Failure Society of America. The intent is to provide the background and the supporting evidence for the recommendations and to provide practical guidance for management strategies in treatment of heart failure patients...
April 17, 2018: Current Cardiology Reports
keyword
keyword
29536
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"