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https://www.readbyqxmd.com/read/28635419/multimodal-imaging-gd-nanoparticles-functionalized-with-pittsburgh-compound-b-or-a-nanobody-for-amyloid-plaques-targeting
#1
Jonathan Pansieri, Marie Plissonneau, Nathalie Stransky-Heilkron, Mireille Dumoulin, Laurence Heinrich-Balard, Pascaline Rivory, Jean-François Morfin, Eva Toth, Maria Joao Saraiva, Eric Allémann, Olivier Tillement, Vincent Forge, François Lux, Christel Marquette
AIM: Gadolinium-based nanoparticles were functionalized with either the Pittsburgh compound B or a nanobody (B10AP) in order to create multimodal tools for an early diagnosis of amyloidoses. MATERIALS & METHODS: The ability of the functionalized nanoparticles to target amyloid fibrils made of β-amyloid peptide, amylin or Val30Met-mutated transthyretin formed in vitro or from pathological tissues was investigated by a range of spectroscopic and biophysics techniques including fluorescence microscopy...
June 21, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28635330/multiple-functions-of-insulin-degrading-enzyme-a-metabolic-crosslight
#2
Grazia R Tundo, Diego Sbardella, Chiara Ciaccio, Giuseppe Grasso, Magda Gioia, Andrea Coletta, Fabio Polticelli, Donato Di Pierro, Danilo Milardi, Peter Van Endert, Stefano Marini, Massimo Coletta
Insulin-degrading enzyme (IDE) is a ubiquitous zinc peptidase of the inverzincin family, which has been initially discovered as the enzyme responsible for insulin catabolism; therefore, its involvement in the onset of diabetes has been largely investigated. However, further studies on IDE unraveled its ability to degrade several other polypeptides, such as β-amyloid, amylin, and glucagon, envisaging the possible implication of IDE dys-regulation in the "aggregopathies" and, in particular, in neurodegenerative diseases...
June 21, 2017: Critical Reviews in Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28614667/n-glycosylation-of-asparagine-130-in-the-extracellular-domain-of-the-human-calcitonin-receptor-significantly-increases-peptide-hormone-affinity
#3
Sang-Min Lee, Jason M Booe, Joseph J Gingell, Virginie Sjoelund, Debbie L Hay, Augen A Pioszak
The calcitonin receptor (CTR) is a class B G protein-coupled receptor that is activated by the peptide hormones calcitonin and amylin. Calcitonin regulates bone remodeling through CTR, whereas amylin regulates blood glucose and food intake by activating CTR in complex with receptor activity-modifying proteins (RAMPs). These receptors are targeted clinically for treatment of osteoporosis and diabetes. Here, we define the role of CTR N-glycosylation in hormone binding using purified calcitonin and amylin receptor extracellular domain (ECD) glycoforms and fluorescence polarization/anisotropy and isothermal titration calorimetry peptide-binding assays...
June 14, 2017: Biochemistry
https://www.readbyqxmd.com/read/28602190/probing-amylin-fibrillation-at-an-early-stage-via-a-tetracysteine-recognising-fluorophore
#4
Shih-Ting Wang, Yiyang Lin, Chia-Chen Hsu, Nadav Amdursky, Christopher D Spicer, Molly M Stevens
Amyloid fibrillation is a nucleation-dependent process known be involved in the development of more than 20 progressive and chronic diseases. The detection of amyloid formation at the nucleation stage can greatly advance early diagnoses and treatment of diseases. In this work, we developed a new assay for the early detection of amylin fibrillation using the biarsenical dye 4,5-bis(1,3,2-dithiarsolan-2-yl)fluorescein (FlAsH), which could recognise tetracysteine motifs and transform from non-fluorescent form into strongly fluorescent complexes...
October 1, 2017: Talanta
https://www.readbyqxmd.com/read/28599848/dynamic-membrane-interactions-of-antibacterial-and-antifungal-biomolecules-and-amyloid-peptides-revealed-by-solid-state-nmr-spectroscopy
#5
REVIEW
Akira Naito, Nobuaki Matsumori, Ayyalusamy Ramamoorthy
A variety of biomolecules acting on the cell membrane folds into a biologically active structure in the membrane environment. It is, therefore, important to determine the structures and dynamics of such biomolecules in a membrane environment. While several biophysical techniques are used to obtain low-resolution information, solid-state NMR spectroscopy is one of the most powerful means for determining the structure and dynamics of membrane bound biomolecules such as antibacterial biomolecules and amyloidogenic proteins; unlike X-ray crystallography and solution NMR spectroscopy, applications of solid-state NMR spectroscopy are not limited by non-crystalline, non-soluble nature or molecular size of membrane-associated biomolecules...
June 6, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28557619/correction-to-gillies-n-a-et%C3%A2-al-fasting-levels-of-insulin-and-amylin-after-acute-pancreatitis-are-associated-with-pro-inflammatory-cytokines
#6
(no author information available yet)
No abstract text is available yet for this article.
May 30, 2017: Archives of Physiology and Biochemistry
https://www.readbyqxmd.com/read/28552704/amylin-receptor-activation-in-the-ventral-tegmental-area-reduces-motivated-ingestive-behavior
#7
Elizabeth G Mietlicki-Baase, Lauren E McGrath, Kieran Koch-Laskowski, Joanna Krawczyk, David J Reiner, Tram Pham, Chan Tran N Nguyen, Christopher A Turner, Diana R Olivos, Mathieu E Wimmer, Heath D Schmidt, Matthew R Hayes
Amylin is produced in the pancreas and the brain, and acts centrally to reduce feeding and body weight. Recent data show that amylin can act in the ventral tegmental area (VTA) to reduce palatable food intake and promote negative energy balance, but the behavioral mechanisms by which these effects occur are not fully understood. The ability of VTA amylin signaling to reduce intake of specific palatable macronutrients (fat or carbohydrate) was tested in rats in several paradigms, including one-bottle acceptance tests, two-bottle choice tests, and a free-choice diet...
May 25, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28552562/the-central-anorexigenic-mechanism-of-amylin-in-japanese-quail-coturnix-japonica-involves-pro-opiomelanocortin-calcitonin-receptor-and-the-arcuate-nucleus-of-the-hypothalamus
#8
Jingwei Yuan, Elizabeth R Gilbert, Mark A Cline
Amylin is a 37-amino acid peptide hormone that exerts anorexigenic effects in humans and animals. We demonstrated that central injection of amylin into chicks affected feeding and related behaviors via the hypothalamus and brainstem, although the molecular mechanisms remained elusive. Thus, the objective of this study was to investigate the molecular mechanisms underlying anorexigenic effects of amylin in 7 day-old Japanese quail. Food but not water intake was reduced after intracerebroventricular amylin injection, and the behavior analysis indicated that this was associated with decreased food pecks and preening...
August 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/28528968/amylin-and-its-g-protein-coupled-receptor-a-probable-pathological-process-and-drug-target-for-alzheimer-s-disease
#9
REVIEW
Wei Qiao Qiu
G-protein-coupled receptors (GPCRs) are shown to be involved in Alzheimer's disease (AD) pathogenesis. However, because GPCRs include a large family of membrane receptors, it is unclear which specific GPCR or pathway with rational ligands can become effective therapeutic targets for AD. Amylin receptor (AmR) is a GPCR that mediates several activities, such as improving glucose metabolism, relaxing cerebrovascular structure, modulating inflammatory reactions and potentially enhancing neural regeneration. Recent studies show that peripheral treatments with amylin or its clinical analog, pramlintide, reduced several components of AD pathology, including amyloid plaques, tauopathy, neuroinflammation and other components in the brain, corresponding with improved learning and memory in AD mouse models...
May 19, 2017: Neuroscience
https://www.readbyqxmd.com/read/28513463/alzheimer-s-disease-against-peptides-products-of-enzymatic-cleavage-app-protein-biological-pathobiological-and-physico-chemical-properties-of-fibrillating-peptides
#10
Małgorzata Marszałek
Various peptides products of enzymatic cleavage of key for Alzheimer's disease Amyloid Precursor Protein (APP) are well known, but still are matter of scientific debate. The Aβ type products are especially challenging for experimental and medical research. This paper outlines several, still poorly known, biological and medical processes such as peptides biology, i.e., formation, biodistribution, translocation, transport and finally removal from brain compartments and body fluids like Intracellular Fluid (ICF), Cerebrospinal Fluid (CSF), Interstitial Fluid (ISF), blood serum or urine...
May 17, 2017: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/28503657/an-amylin-analog-used-as-a-challenge-test-for-alzheimer-s-disease
#11
Haihao Zhu, Robert A Stern, Qiushan Tao, Alexandra Bourlas, Maritza D Essis, Meenakshi Chivukula, James Rosenzweig, Devin Steenkamp, Weiming Xia, Gustavo A Mercier, Yorghos Tripodis, Martin Farlow, Neil Kowall, Wei Qiao Qiu
INTRODUCTION: Preclinical studies demonstrate the potential of amylin in the diagnosis of Alzheimer's disease (AD). We aimed to lay the foundation for repurposing the amylin analog and a diabetes drug, pramlintide, for AD in humans. METHODS: We administered a single subcutaneous injection of 60 μg of pramlintide to nondiabetic subjects under fasting conditions. RESULTS: None of the participants developed hypoglycemia after the injection of pramlintide...
January 2017: Alzheimer's & Dementia: Translational Research & Clinical Interventions
https://www.readbyqxmd.com/read/28492735/subclinical-diabetes
#12
Luís M T R Lima
Type 2 diabetes mellitus (T2DM) is increasing in prevalence worldwide, and those non-diagnosed or misdiagnosed comprise a significant group compared to those diagnosed. Accumulated scientific evidence indicate that the current diagnostic markers (fasting glycemia, 2h glycemia after an oral glucose load and HbA1c) are indeed late diagnostic criteria when considering the incidence of diabetes-related complications and comorbidities, which are also at high risk in some groups among normoglycemic individuals. Additionally, the earlier identification of future risk of diabetes is desirable since it would allow better adherence to preventive actions such as lifestyle intervention, ultimately avoiding complications and minimizing the economic impact/burden on health care expenses...
May 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28485843/amylin
#13
REVIEW
Debbie L Hay
Amylin is a 37 amino acid peptide hormone that is closely related to calcitonin gene-related peptide (CGRP). Amylin and CGRP share a receptor and are reported to have several similar biological actions. Given the important role of CGRP in migraine and intense efforts to develop drugs against this target, it is important to consider potential areas of overlap between the amylin and CGRP systems. This short review provides a brief introduction to amylin biology, the use of an amylin analog to treat diabetes, and consideration of whether amylin could have any role in headache disorders...
May 2017: Headache
https://www.readbyqxmd.com/read/28438778/the-dual-amylin-and-calcitonin-receptor-agonist-kbp-042-works-as-adjunct-to-metformin-on-fasting-hyperglycemia-and-hba1c-in-a-rat-model-of-type-2-diabetes
#14
Sara T Hjuler, Sofie Gydesen, Kim V Andreassen, Morten A Karsdal, Kim Henriksen
KBP-042 is a dual amylin and calcitonin receptor agonist that increases glucose tolerance and insulin action and reduces body weight in rat models of obesity and prediabetes. The objective of the present study was to 1) evaluate KBP-042 as a treatment of late-stage type 2 diabetes in a rat model and 2) assess the value of adding KBP-042 to the standard of care, metformin, to consider KBP-042 as a relevant drug for treating patients with type 2 diabetes. Two studies were included: an intervention study and a prevention study...
July 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/28426339/fasting-levels-of-insulin-and-amylin-after-acute-pancreatitis-are-associated-with-pro-inflammatory-cytokines
#15
Nicola A Gillies, Sayali A Pendharkar, Ruma G Singh, John A Windsor, Madhav Bhatia, Maxim S Petrov
BACKGROUND: The prevalence of metabolic diseases continues to rise worldwide, with a growing recognition of metabolic dysregulation after acute inflammatory diseases such as acute pancreatitis (AP). Adipokines and cytokines play an important role in metabolism and the course of AP, but there is a paucity of research investigating their relationship with pancreatic hormones after AP. This study aimed to explore associations between pancreatic hormones and adipokines as well as cytokines to provide insights into the pathophysiology of altered pancreatic hormone secretion following AP...
April 20, 2017: Archives of Physiology and Biochemistry
https://www.readbyqxmd.com/read/28417590/calcitonin-gene-related-peptide-cgrp-a-novel-target-for-alzheimer-s-disease
#16
REVIEW
Yogendra Singh, Gaurav Gupta, Birendra Shrivastava, Rajiv Dahiya, Juhi Tiwari, Madhu Ashwathanarayana, Rakesh Kumar Sharma, Mohit Agrawal, Anurag Mishra, Kamal Dua
Alzheimer's disease (AD) is leading cause of death among older characterized by neurofibrillary tangles, oxidative stress, progressive neuronal deficits, and increased levels of amyloid-β (Aβ) peptides. Cholinergic treatment could be the best suitable physiological therapy for AD. Calcitonin gene-related peptide (CGRP) is a thirty-seven-amino acid regulatory neuropeptide resulting from different merging of the CGRP gene, which also includes adrenomedullin, amylin, calcitonin, intermedin, and calcitonin receptor-stimulating peptide...
June 2017: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/28407200/adrenomedullin-2-intermedin-a-putative-drug-candidate-for-treatment-of-cardiometabolic-diseases
#17
REVIEW
Song-Yang Zhang, Ming-Jiang Xu, Xian Wang
Adrenomedullin (ADM) 2/Intermedin (IMD) is a short peptide that belongs to the CGRP superfamily. Although it shares receptors with CGRP, ADM and amylin (AMY), ADM2 has significant and unique functions in the cardiovascular system. In the past decade, the cardiovascular effect of ADM2 has carefully been studied. In this review, progress in understanding ADM2's effects on the cardiovascular system as well as its protective role in cardiometabolic diseases are summarized.
April 13, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28369078/the-effect-of-meal-frequency-in-a-reduced-energy-regimen-on-the-gastrointestinal-and-appetite-hormones-in-patients-with-type-2-diabetes-a-randomised-crossover-study
#18
Lenka Belinova, Hana Kahleova, Hana Malinska, Ondrej Topolcan, Jindra Windrichova, Olena Oliyarnyk, Ludmila Kazdova, Martin Hill, Terezie Pelikanova
BACKGROUND: Appetite and gastrointestinal hormones (GIHs) participate in energy homeostasis, feeding behavior and regulation of body weight. We demonstrated previously the superior effect of a hypocaloric diet regimen with lower meal frequency (B2) on body weight, hepatic fat content, insulin sensitivity and feelings of hunger compared to the same diet divided into six smaller meals a day (A6). Studies with isoenergetic diet regimens indicate that lower meal frequency should also have an effect on fasting and postprandial responses of GIHs...
2017: PloS One
https://www.readbyqxmd.com/read/28368485/measurement-of-pro-islet-amyloid-polypeptide-1-48-in-diabetes-and-islet-transplants
#19
Jaques A Courtade, Agnieszka M Klimek-Abercrombie, Yi-Chun Chen, Nirja Patel, Phoebe Y T Lu, Cate Speake, Paul C Orban, Behzad Najafian, Graydon Meneilly, Carla J Greenbaum, Garth L Warnock, Constadina Panagiotopoulos, C Bruce Verchere
Context: Islet amyloid is a feature of beta cell failure in type 2 diabetes (T2D) and type 1 diabetic (T1D) recipients of islet transplants. Islet amyloid contains islet amyloid polypeptide (IAPP; amylin), a circulating peptide that is produced in beta cells by processing of its precursor, proIAPP1-67, via an intermediate form, proIAPP1-48. Elevated proinsulin to C-peptide ratios in the plasma of persons with diabetes suggest defects in beta cell prohormone processing. Objective: Determine whether plasma levels of precursor forms of IAPP are elevated in diabetes...
March 24, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28363773/amylin-receptor-ligands-reduce-the-pathological-cascade-of-alzheimer-s-disease
#20
Haihao Zhu, Xiehua Xue, Erming Wang, Max Wallack, Hana Na, Jacob M Hooker, Neil Kowall, Qiushan Tao, Thor D Stein, Benjamin Wolozin, Wei Qiao Qiu
Amylin is an important gut-brain axis hormone. Since amylin and amyloid-β peptide (Aβ) share similar β sheet secondary structure despite not having the same primary sequences, we hypothesized that the accumulation of Aβ in the brains of subjects with Alzheimer's disease (AD) might compete with amylin for binding to the amylin receptor (AmR). If true, adding exogenous amylin type peptides would compete with Aβ and reduce the AD pathological cascade, improving cognition. Here we report that a 10-week course of peripheral treatment with human amylin significantly reduced multiple different markers associated with AD pathology, including reducing levels of phospho-tau, insoluble tau, two inflammatory markers (Iba1 and CD68), as well as cerebral Aβ...
June 2017: Neuropharmacology
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