keyword
MENU ▼
Read by QxMD icon Read
search

Amylin

keyword
https://www.readbyqxmd.com/read/29780554/mechanistic-perspective-and-functional-activity-of-insulin-in-amylin-aggregation
#1
Michal Baram, Sharon Gilead, Ehud Gazit, Yifat Miller
Insulin is a key regulatory polypeptide that is secreted from pancreatic β-cells and has several important effects on the synthesis of lipids, regulation of enzymatic activities, blood glucose levels and the prevention of hyperglycemia. Insulin was demonstrated to self-assemble into ordered amyloid fibrils upon repeated injections, although the possible biological significance of the supramolecular structures is enigmatic. Amylin is also an amyloidogenic polypeptide that is secreted from pancreatic β-cells and plays an important role in glycemic regulation preventing post-prandial spikes in blood glucose levels...
May 14, 2018: Chemical Science
https://www.readbyqxmd.com/read/29775005/-determination-and-significance-of-serum-mpo-and-amylin-in-adult-patients-with-osahs-after-short-range-noninvasive-positive-pressure-ventilation
#2
X H Chen, P J Chen, Y Long, Q P Huang
Objective: The aim of this study to investigate the determination and significance of serum MPO and amylin in adult patients with OSAHS after short-range noninvasive positive pressure ventilation. Method: Eighty-seven OSAHS patients were divided into severe group (30 cases), moderate group (30 cases) and mild group (27 cases) according to the AHI range. Twenty-seven outpatient health persons were selected as the control group. Serum amylin and myeloperoxidase were measured by ELISA; Amyloid and myeloperoxidase were reassessed in 30 patients with severe OSAHS after 6 months of combined therapy, and the relationship between amylin, myeloperoxidase and PSG was analyzed...
June 5, 2017: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
https://www.readbyqxmd.com/read/29775001/-expression-and-significance-of-serum-hepatocyte-growth-factor-and-myeloperoxidase-in-patients-with-obstructive-sleep-apnea-hypopnea-syndrome
#3
L B Liao, J M Zhai, G G Chen, Z E Ma, X B Yang, J G Zhang
Objective: The aim of this study is to explore the expression and significance of serum HGF and MPO in patients with obstructive sleep apnea hypopnea syndrome (OSAHS) in adults. Method: Ninety-six cases of OSAHS patients diagnosed by PSG were divided into 3 groups: Heavy, medium and light according to the range of AHI; 32 cases of outpatients were healthy persons as the control group. The serum HGF and MPO were determined by ELISA; HGF and MPO were measured after comprehensive treat with CPAP in patients with severe OSAHS, and the correlation between HGF, MPO and PSG were analyzed...
June 5, 2017: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
https://www.readbyqxmd.com/read/29757200/a-rationally-designed-hsp70-variant-rescues-the-aggregation-associated-toxicity-of-human-iapp-in-cultured-pancreatic-islet-%C3%AE-cells
#4
Marie Nicole Bongiovanni, Francesco Antonio Aprile, Pietro Sormanni, Michele Vendruscolo
Molecular chaperones are key components of the protein homeostasis system against protein misfolding and aggregation. It has been recently shown that these molecules can be rationally modified to have an enhanced activity against specific amyloidogenic substrates. The resulting molecular chaperone variants can be effective inhibitors of protein aggregation in vitro, thus suggesting that they may provide novel opportunities in biomedical and biotechnological applications. Before such opportunities can be exploited, however, their effects on cell viability should be better characterised...
May 12, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29738349/a-pilot-study-of-pancreatic-islet-amyloid-pet-imaging-with-18f-fddnp
#5
Zhi Lu, Jinghui Xie, Ran Yan, Zilin Yu, Zhigang Sun, Fei Yu, Xiaoyan Gong, Hongbo Feng, Jing Lu, Yanjun Zhang
OBJECTIVES: Pancreatic islet amyloid deposition occurs before β-cell damage in type 2 diabetes mellitus patients. The islet and Alzheimer's disease β-amyloid shares similar secondary structures. The Alzheimer's disease β-amyloid targeting tracer [F]FDDNP could be used to image pancreatic islet amyloid with PET. PATIENTS AND METHODS: Consecutive pancreatic tissue sections from a 69-year-old male type 2 diabetes mellitus patient were stained by hematoxylin and eosin, anti-amylin antibody, Congo Red, periodic acid-Schiff, and [F]FDDNP reference compound, respectively...
May 5, 2018: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/29731652/adjunctive-therapy-for-glucose-control-in-patients-with-type-1-diabetes
#6
REVIEW
Kira Harris, Cassie Boland, Lisa Meade, Dawn Battise
Type 1 diabetes mellitus (T1DM) is characterized by relative or absolute insulin deficiency. Despite treatment with insulin therapy, glycemic goals are not always met, and insulin therapy is sometimes limited by adverse effects, including hypoglycemia and weight gain. Several adjunctive therapies have been evaluated in combination with insulin in patients with T1DM to improve glycemic control while minimizing adverse effects. Pramlintide, an amylin analog, can improve glycemic control, primarily through lowering postprandial blood glucose levels...
2018: Diabetes, Metabolic Syndrome and Obesity: Targets and Therapy
https://www.readbyqxmd.com/read/29729352/pegylated-prodrugs-of-antidiabetic-peptides-amylin-and-glp-1
#7
Roland Böttger, Daniel Knappe, Ralf Hoffmann
Agonists of the glucagon-like peptide-1 (GLP-1) receptor and analogs of human amylin have been studied for almost two decades due to their therapeutic potential to treat diabetes mellitus and obesity. Both native peptides exhibit unfavorable pharmacokinetics. Even optimized analogs less prone to proteolysis have to be applied at least daily or once-weekly utilizing microsphere formulations or fusion to proteins. Thus, innovative approaches allowing tuning the drug levels to achieve beneficial therapeutic responses and prolonged application intervals are demanded...
May 2, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29709194/inhibition-of-human-amylin-aggregation-and-cellular-toxicity-by-lipoic-acid-and-ascorbic-acid
#8
Sarah Kassem Azzam, Hyunwoo Jang, Myung Chul Choi, Habiba Alsafar, Suryani Lukman, Sungmun Lee
More than 30 human degenerative diseases result from protein aggregation such as Alzheimer's disease (AD) and type 2 diabetes mellitus (T2DM). Islet amyloid deposits, a hallmark in T2DM, are found in pancreatic islets of more than 90 % of T2DM patients. An association between amylin aggregation and reduction in β-cell mass was also established by post-mortem studies. A strategy in preventing protein aggregation-related disorders is to inhibit the protein aggregation and associated toxicity. In this study we demonstrated that two inhibitors, lipoic acid and ascorbic acid, significantly inhibited amylin aggregation...
April 30, 2018: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29705815/pancreatic-%C3%AE-cells-overexpressing-hiapp-impaired-mitophagy-and-unbalanced-mitochondrial-dynamics
#9
Miriam García Hernández, Ana García Aguilar, Jesús Burillo, Raquel Gómez Oca, Maria Antonietta Manca, Ana Novials, Gema Alcarraz-Vizan, Carlos Guillén, Manuel Benito
Human islet amyloid polypeptide (hIAPP), or amylin, has the tendency to aggregate into insoluble amyloid fibrils, a typical feature of islets from type 2 diabetes individuals. Thus, we investigated comparatively the impact of hIAPP on key pathways involved in pancreatic beta survival. INS1E-hIAPP cells present a hyperactivation of MTORC1 and an inhibition of autophagy signaling, those cells showing an increase in cell size. Resveratrol, a MTORC1 inhibitor, can reverse TSC2 degradation that occurs in INS1E-hIAPP cells and diminished MTORC1 hyperactivation with concomitant autophagy stimulation...
April 29, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29696037/pharmacological-treatment-in-diabetes-mellitus-type-1-insulin-and-what-else
#10
REVIEW
Ewa Otto-Buczkowska, Natalia Jainta
The basis of treatment in autoimmune diabetes is insulin therapy; however, many clinical cases have proven that this method does not solve all problems. Trials of causal treatment including blocking the autoimmune processes and insulin-producing cells transplants were carried out. Those methods require more research to be concerned as efficient and safe ways of treatment in type 1 diabetes. The use of non-insulin adjunct treatment is a new trend. It has been successfully used in laboratories as well as clinical trials...
January 2018: International Journal of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29681765/metabolic-derangements-contribute-to-reduced-srage-isoforms-in-subjects-with-alzheimer-s-disease
#11
Kelly N Z Fuller, Edwin R Miranda, John P Thyfault, Jill K Morris, Jacob M Haus
Although there is evidence for metabolic dysfunction and chronic inflammation in Alzheimer's disease (AD), circulating levels of soluble receptor for advanced glycation end products (sRAGE) and the receptor for advanced glycation end products (RAGE) ligand S100B have not been characterized. sRAGE is an important mediator in disease as it can act as a ligand decoy for RAGE and attenuate downstream inflammatory signaling. Cognitively healthy elderly and AD participants with and without type 2 diabetes ( n = 135) were stratified according to the clinical dementia rating (CDR; 0 = normal cognition (NC); ≥0...
2018: Mediators of Inflammation
https://www.readbyqxmd.com/read/29665351/neuroendocrine-response-to-gaba-b-receptor-agonism-in-alcohol-dependent-individuals-results-from-a-combined-outpatient-and-human-laboratory-experiment
#12
Mehdi Farokhnia, Mikela B Sheskier, Mary R Lee, April N Le, Erick Singley, Sofia Bouhlal, Timmy Ton, Zhen Zhao, Lorenzo Leggio
Gamma-aminobutyric acid (GABA), the main inhibitory neurotransmitter in the nervous system, plays an important role in biobehavioral processes that regulate alcohol seeking, food intake, and stress response. The metabotropic GABA-B receptor has been investigated as a potential therapeutic target for alcohol use disorder, by using orthosteric agonists (e.g., baclofen) and positive allosteric modulators. Whether and how pharmacological manipulation of the GABA-B receptor, in combination with alcohol intake, may affect feeding- and stress-related neuroendocrine pathways remains unknown...
April 14, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29627323/apoptosis-signal-regulating-kinase-1-and-nadph-oxidase-mediate-human-amylin-evoked-redox-stress-and-apoptosis-in-pancreatic-beta-cells
#13
Sanghamitra Singh, Diti Chatterjee Bhowmick, Satyabrata Pany, Myungkuk Joe, Noor Zaghlula, Aleksandar M Jeremic
Misfolded toxic human islet amyloid polypeptide or amylin (hA) and plasma membrane-associated redox complex, NADPH oxidase (NOX), have been implicated in the islet β-cell demise associated with type-2 diabetes mellitus (T2DM). Studies show that hA accumulation is stressful to β-cells and that misfolding of human amylin evokes redox stress and activates mitogen activated protein (MAP) kinases, p38 MAPK and c-Jun N-terminal (JNK) kinase. However, the molecular link and causality between hA-evoked redox stress, NOX activity and MAP kinases signaling in pancreatic β-cells is incompletely understood...
April 5, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29604965/computational-modeling-of-amylin-induced-calcium-dysregulation-in-rat-ventricular-cardiomyocytes
#14
Bradley D Stewart, Caitlin E Scott, Thomas P McCoy, Guo Yin, Florin Despa, Sanda Despa, Peter M Kekenes-Huskey
Hyperamylinemia is a condition that accompanies obesity and precedes type II diabetes, and it is characterized by above-normal blood levels of amylin, the pancreas-derived peptide. Human amylin oligomerizes easily and can deposit in the pancreas [1], brain [2], and heart [3], where they have been associated with calcium dysregulation. In the heart, accumulating evidence suggests that human amylin oligomers form moderately cation-selective [4,5] channels that embed in the cell sarcolemma (SL). The oligomers increase membrane conductance in a concentration-dependent manner [5], which is correlated with elevated cytosolic Ca2+ ...
May 2018: Cell Calcium
https://www.readbyqxmd.com/read/29580826/protein-aggregates-and-proteostasis-in-aging-amylin-and-%C3%AE-cell-function
#15
REVIEW
Michaela Press, Tobias Jung, Jeannette König, Tilman Grune, Annika Höhn
The ubiquitin-proteasomal-system (UPS) and the autophagy-lysosomal-system (ALS) are both highly susceptible for disturbances leading to the accumulation of cellular damage. A decline of protein degradation during aging results in the formation of oxidatively damaged and aggregated proteins finally, resulting in failure of cellular functionality. Besides protein aggregation in response to oxidative damage, amyloids are a different type of protein aggregates able to distract proteostasis and interfere with cellular functionality...
March 23, 2018: Mechanisms of Ageing and Development
https://www.readbyqxmd.com/read/29566540/molecular-studies-of-cgrp-and-the-cgrp-family-of-peptides-in-the-central-nervous-system
#16
Erica R Hendrikse, Rebekah L Bower, Debbie L Hay, Christopher S Walker
Background Calcitonin gene-related peptide is an important target for migraine and other painful neurovascular conditions. Understanding the normal biological functions of calcitonin gene-related peptide is critical to understand the mechanisms of calcitonin gene-related peptide-blocking therapies as well as engineering improvements to these medications. Calcitonin gene-related peptide is closely related to other peptides in the calcitonin gene-related peptide family of peptides, including amylin. Relatedness in peptide sequence and in receptor biology makes it difficult to tease apart the contributions that each peptide and receptor makes to physiological processes and to disorders...
January 1, 2018: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/29555191/molecular-mechanisms-of-membrane-associated-amyloid-aggregation-computational-perspective-and-challenges
#17
REVIEW
Olga Press-Sandler, Yifat Miller
Amyloidogenic proteins are related to a variety of amyloid diseases, such as type 2 diabetes (T2D), Alzheimer's disease (AD) and Parkinson's disease (PD). The amyloid proteins in which this review focuses include amylin, Aβ, tau and α-synuclein. Understanding the molecular mechanisms in which these amyloidogenic proteins interact with membranes is a challenging research to both experimental and computational studies. This review illustrates recent studies on amyloid-membrane interactions, but it mainly focuses on the challenge issues related to experimental techniques to investigate at the molecular level these interactions and provides thoughts and outlook for future computational studies...
March 16, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29518374/iapp-in-type-ii-diabetes-basic-research-on-structure-molecular-interactions-and-disease-mechanisms-suggests-potential-intervention-strategies
#18
REVIEW
Shreyasi Asthana, Bibekanand Mallick, Andrei T Alexandrescu, Suman Jha
Islet amyloid polypeptide (a.k.a. IAPP, amylin) is a 37 amino acid hormone that has long been associated with the progression of type II diabetes mellitus (TIIDM) disease. The endocrine peptide hormone aggregatively misfolds to form amyloid deposits in and around the pancreatic islet β-cells that synthesize both insulin and IAPP, leading to a decrease in β-cell mass in patients with the disease. Extracellular IAPP amyloids induce β-cell death through the formation of reactive oxygen species, mitochondrial dysfunction, chromatin condensation, and apoptotic mechanisms, although the precise roles of IAPP in TIIDM are yet to be established...
March 6, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29512286/transthyretin-mimetics-as-anti-%C3%AE-amyloid-agents-a-comparison-of-peptide-and-protein-approaches
#19
Kayla M Pate, Brandon J Kim, Eric V Shusta, Regina M Murphy
β-Amyloid (Aβ) aggregation is causally linked to neuronal pathology in Alzheimer's disease; therefore, several small molecules, antibodies, and peptides have been tested as anti-Aβ agents. We developed two compounds based on the Aβ-binding domain of transthyretin (TTR): a cyclic peptide cG8 and an engineered protein mTTR, and compared them for therapeutically relevant properties. Both mTTR and cG8 inhibit fibrillogenesis of Aβ, with mTTR inhibiting at a lower concentration than cG8. Both inhibit aggregation of amylin but not of α-synuclein...
May 8, 2018: ChemMedChem
https://www.readbyqxmd.com/read/29505875/the-smaller-heparin-fragments-bind-non-specifically-through-the-iapp-sequence-an-in-silico-study
#20
Shreyasi Asthana, Mousumi Sahu, Parth Sarathi Nayak, Bibekanand Mallick, Suman Jha
The diminishing β-cell mass of pancreas in type II diabetes mellitus (TIIDM) is intricately linked with high fibrillation propensity of islet amyloid polypeptide (IAPP, aka amylin). IAPP is one of the most amyloidogenic peptide secreted by pancreatic β-cells. In the autopsy of TIIDM patients, IAPP rich amyloid plaques are found containing different components of extracellular matrix (ECM), including heparin. For a positively charged IAPP, interaction with heparin which has accessible high density negatively charged functional groups is anticipated to moderate the fibrillation kinetics...
July 1, 2018: International Journal of Biological Macromolecules
keyword
keyword
67310
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"