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https://www.readbyqxmd.com/read/28930573/molecular-biology-of-amitraz-resistance-in-cattle-ticks-of-the-genus-rhipicephalus
#1
Nicholas N Jonsson, Guilherme Klafke, Sean W Corley, Jason Tidwell, Christina M Berry, Hh Caline Koh-Tan
Amitraz is an important product for the control of cattle ticks around the world. In comparison with other products for the control of ticks, it is quite affordable and it has a rapid knock-down effect. It binds with and activates adrenergic neuro-receptors of animals and it inhibits the action of monoamine oxidases (MAO). Resistance to amitraz has been documented in Rhipicephalus microplus, R. decoloratus and R. appendiculatus. Four mechanisms of resistance have been proposed, each of which is supported by evidence but none of which has been definitively confirmed as the cause of resistance in the field...
January 1, 2018: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28929686/-borneol-promotes-catalpol-and-puerarin-crossing-through-blood-brain-barrier-in-focal-cerebral-ischemic-rats
#2
Jun-Jie Wu, Hong-Jin Wang, Shuai Yang, Yang Liu, Xiao-Yu Xu
Previous studies showed that borneol could promote some drugs crossing through the blood-brain-barrier (BBB) at certain conditions. However, the mechanism has not been clarified yet. This study aimed to investigate the effect of bornrol on promoting catalpol and puerarin through BBB and explore the relevant mechanism. The focal cerebral ischemic rats were divided into 7 groups randomly and then were administered corresponding drugs: model group (M, solvent), catalpol-puerarin group (ZG, catalpol 45 mg•kg⁻¹+puerarin 200 mg•kg⁻¹), catalpol-puerarin-bornrol group(ZGB, catalpol 45 mg•kg⁻¹+puerarin 200 mg•kg⁻¹ +bornrol 200 mg•kg⁻¹), catalpol-bornrol group(ZB, catalpol 45 mg•kg⁻¹ +bornrol 200 mg•kg⁻¹), puerarin-bornrol group(GB, puerarin 200 mg•kg⁻¹ +bornrol 200 mg•kg⁻¹), butoxamine-ZG group(BTX+ZG, butoxamine 1...
November 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28929393/electrophysiological-characteristics-of-the-rat-azygos-vein-under-electrical-pacing-and-adrenergic-stimulation
#3
Alexandra D Ivanova, Vlad S Kuzmin
Rodent thoracic veins are characterized by an extended myocardial coating. In the present study, the electrical activity in the cardiac tissue of the rat azygos vein (AZV) was investigated for the first time. The atrial-like action potentials (AP) and atrial-like conduction of the excitation were observed in the rat AZV under continuous electrical pacing. Termination of electrical pacing resulted in spontaneous positive shift of resting membrane potential (RMP) in AZV. Boradrenaline induced biphasic effects on RMP in all quiescent AZV preparations but only in 25% preparations-bursts of spontaneous AP, which were suppressed by both α- and β-adrenoreceptor antagonists...
September 19, 2017: Journal of Physiological Sciences: JPS
https://www.readbyqxmd.com/read/28928674/the-gly-16-allele-of-the-g16r-single-nucleotide-polymorphism-in-the-%C3%AE-2-adrenergic-receptor-gene-augments-the-glycemic-response-to-adrenaline-in-humans
#4
Kim Z Rokamp, Jonatan M Staalsø, Morten Zaar, Peter Rasmussen, Lonnie G Petersen, Rikke V Nielsen, Niels H Secher, Niels V Olsen, Henning B Nielsen
Cerebral non-oxidative carbohydrate consumption may be driven by a β2-adrenergic mechanism. This study tested whether the 46G > A (G16R) single nucleotide polymorphism of the β2-adrenergic receptor gene (ADRB2) influences the metabolic and cerebrovascular responses to administration of adrenaline. Forty healthy Caucasian men were included from a group of genotyped individuals. Cardio- and cerebrovascular variables at baseline and during a 60-min adrenaline infusion (0.06 μg kg(-1) min(-1)) were measured by Model flow, near-infrared spectroscopy and transcranial Doppler sonography...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28928571/dexmedetomidine-as-adjuvant-to-lower-doses-of-intrathecal-bupivacaine-for-lower-limb-orthopedic-surgeries
#5
Taznim Mohamed, Indu Susheela, Beena P Balakrishnan, Suvarna Kaniyil
BACKGROUND: Dexmedetomidine, an α2 adrenergic agonist, has been found to be a useful adjuvant to local anesthetics. It has been found to produce satisfactory block with lower doses of spinal bupivacaine. AIM: The aim of this study is to compare the difference in spinal block characteristics and hemodynamic effects of 7, 8, and 9 mg hyperbaric bupivacaine combined with 5 μg dexmedetomidine and to find out the optimum dose that would provide satisfactory block and hemodynamic stability for lower limb orthopedic surgeries...
July 2017: Anesthesia, Essays and Researches
https://www.readbyqxmd.com/read/28928121/novel-pharmacological-probes-reveal-abhd5-as-a-locus-of-lipolysis-control-in-white-and-brown-adipocytes
#6
Elizabeth A Rondini, Ljiljana Mladenovic-Lucas, William R Roush, Geoff Halvorsen, Alex E Green, James G Granneman
Current knowledge regarding acute regulation of adipocyte lipolysis is largely based on receptor-mediated activation or inhibition of pathways that influence intracellular levels of cyclic AMP (cAMP), thereby affecting protein kinase A (PKA) activity. We recently identified synthetic ligands of α-β-hydrolase domain containing 5 (ABHD5) that directly activate adipose triglyceride lipase (ATGL) by dissociating ABHD5 from its inhibitory regulator, perilipin-1 (PLIN1). In the current study we used these novel ligands to determine the direct contribution of ABHD5 to various aspects of lipolysis control in white (3T3-L1) and brown adipocytes...
September 19, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/28927156/activation-of-%C3%AE-adrenergic-receptor-promotes-cellular-proliferation-in-human-glioblastoma
#7
Jing-Jing He, Wen-Hua Zhang, Shi-Ling Liu, Yi-Fang Chen, Chen-Xi Liao, Qian-Qing Shen, Ping Hu
Glioblastoma multiforme is the most common and aggressive form of primary malignant brain tumor. Previous evidence demonstrates that β-adrenergic receptors (β-ARs) are closely associated with the occurrence and development of brain tumors. However, the functional role of β-ARs in human glioblastoma and the underlying mechanisms are not fully understood. In the present study, by using the MTT assay, western blotting, and the reverse transcription polymerase chain reaction, it was revealed that isoproterenol (ISO), an agonist of β-ARs, promoted the proliferation of U251 cells but not U87-MG cells, and that this effect was blocked by the β-ARs antagonist propranolol...
September 2017: Oncology Letters
https://www.readbyqxmd.com/read/28923554/increased-platelet%C3%A2-alpha2b-adrenergic-receptor-gene-expression-in-well-controlled-hypertensives-the-effect-of-arterial-stiffness
#8
Maria E Marketou, Joanna E Kontaraki, John A Papadakis, George E Vrentzos, Alexandros Patrianakos, Konstantinos Fragkiadakis, Panagiotis Tsiverdis, Dimitris Lempidakis, Gregory Chlouverakis, Panos E Vardas, Fragiskos I Parthenakis
Catecholamines play a major role in atherothrombotic mechanisms in essential hypertension. Alpha2B-adrenergic receptors (α2B-ARs) are implicated in the pathophysiology of platelet aggregation. In this study, we evaluated platelet α2B-AR gene expression levels in patients with well-controlled essential hypertension compared with normal individuals and investigated their association with increased arterial stiffness. Fifty-nine patients with well-controlled essential hypertension (34 men, mean age 65 ± 9 years) and 26 normotensives (19 men, mean age 64 ± 8 years) were included in the study...
August 26, 2017: Journal of the American Society of Hypertension: JASH
https://www.readbyqxmd.com/read/28923249/akap-lbc-mediates-protection-against-doxorubicin-induced-cardiomyocyte-toxicity
#9
Stefania Caso, Darko Maric, Miroslav Arambasic, Susanna Cotecchia, Dario Diviani
Doxorubicin (DOX) is a chemotherapic agent that is widely used to treat hematological and solid tumors. Despite its efficacy, DOX displays significant cardiac toxicity associated with cardiomyocytes death and heart failure. Cardiac toxicity is mainly associated with the ability of DOX to alter mitochondrial function. The current lack of treatments to efficiently prevent DOX cardiotoxicity underscores the need of new therapeutic approaches. Our current findings show that stimulation of cardiomyocytes with the α1-adrenergic receptor (AR) agonist phenylephrine (PE) significantly inhibits the apoptotic effect of DOX...
September 16, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28919864/%C3%AE-subunits-control-the-effects-of-human-kv4-3-potassium-channel-phosphorylation
#10
Geoffrey W Abbott
The transient outward K(+) current, Ito, activates early in the cardiac myocyte action potential, to begin repolarization. Human Ito is generated primarily by two Kv4.3 potassium channel α subunit splice variants (Kv4.3L and Kv4.3S) that diverge only by a C-terminal, membrane-proximal, 19-residue stretch unique to Kv4.3L. Protein kinase C (PKC) phosphorylation of threonine 504 within the Kv4.3L-specific 19-residues mediates α-adrenergic inhibition of Ito in human heart. Kv4.3 is regulated in human heart by various β subunits, including cytosolic KChIP2b and transmembrane KCNEs, yet their impact on the functional effects of human Kv4...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28919049/perioperative-outcomes-of-syndromic-paraganglioma-and-pheochromocytoma-resection-in-patients-with-von-hippel-lindau-disease-multiple-endocrine-neoplasia-type-2-or-neurofibromatosis-type-1
#11
James J Butz, Qi Yan, Travis J McKenzie, Toby N Weingarten, Alexandre N Cavalcante, Irina Bancos, William F Young, Darrell R Schroeder, David P Martin, Juraj Sprung
BACKGROUND: Pheochromocytoma and/or paraganglioma associated with neurofibromatosis type 1, multiple endocrine neoplasia type 2A, and von Hippel-Lindau disease have different catecholamine biochemical phenotypes. We examined perioperative outcomes of pheochromocytoma/paraganglioma resection in 3 syndromic forms. METHODS: Retrospective review of patients undergoing resection of syndromic pheochromocytoma/paraganglioma from 2000 through 2016. RESULTS: Eighty-one patients underwent pheochromocytoma/paraganglioma resection (multiple endocrine neoplasia type 2A, n = 36; neurofibromatosis type 1, n = 26; von Hippel-Lindau disease, n = 19)...
September 14, 2017: Surgery
https://www.readbyqxmd.com/read/28918935/dense-intra-adipose-sympathetic-arborizations-are-essential-for-cold-induced-beiging-of-mouse-white-adipose-tissue
#12
Haochen Jiang, Xiaofan Ding, Ying Cao, Huanhuan Wang, Wenwen Zeng
Efferent signals from the central nervous system represent a key layer of regulation of white adipose tissue (WAT). However, the mechanism by which efferent neural signals control WAT metabolism remains to be better understood. Here, we exploit the volume fluorescence-imaging technique to visualize the neural arborizations in mouse inguinal WAT at single-fiber resolution. The imaging reveals a dense network of sympathetic arborizations that had been previously undetected by conventional methods, with sympathetic fibers being in close apposition to > 90% of adipocytes...
September 5, 2017: Cell Metabolism
https://www.readbyqxmd.com/read/28918342/the-potential-effect-of-ultra-long-insulin-degludec-on-glycemic-variability
#13
REVIEW
M Rodacki, R M Carvalho, L Zajdenverg
Despite the therapeutic advances in the treatment of diabetes, metabolic control instability due to glycemic variability (GV) is frequently observed in patients with diabetes on intensive insulin therapy and is associated with hyperglycemic peaks and hypoglycemic episodes. Hyperglycemia associated with GV has been implicated in the development of chronic complications due to its pro-oxidative consequences. On the other hand, hypoglycemia can be associated with increased cardiovascular risk secondarily to adrenergic activation...
June 30, 2017: Diabetes Research and Clinical Practice
https://www.readbyqxmd.com/read/28917893/carboxymethyl-cyclosophoraoses-as-a-flexible-ph-responsive-solubilizer-for-pindolol
#14
Yiluo Hu, Hwanhee Kim, Vijay Vilas Shinde, Daham Jeong, Youngjin Choi, Eunae Cho, Seunho Jung
In the present study, cyclosophoraoses (CyS) (β-1,2 linked cyclic glucans, with glucopyranose units ranging from 17 to 23) isolated from Rhizobium leguminosarum biovar viciae VF-39 were modified with carboxymethyl (CM) groups, and the pH-sensitive complexation of CM CyS with pindolol was investigated. The solubility of pindolol increased 32-fold by its complexation with 5mM CM CyS at pH 10, whereas it shows no significant change at pH 3. Pindolol, a β-adrenergic blocking agent, has a hydrophobic nature at non-ionized state, and CM CyS could solubilize efficiently pindolol in a high alkaline solution...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917508/insulin-dependent-metabolic-and-inotropic-responses-in-the-heart-are-modulated-by-hydrogen-peroxide-from-nadph-oxidase-isoforms-nox2-and-nox4
#15
Benjamin Steinhorn, Juliano L Sartoretto, Andrea Sorrentino, Natalia Romero, Hermann Kalwa, E Dale Abel, Thomas Michel
RATIONALE: Hydrogen peroxide (H2O2) is a stable reactive oxygen species (ROS) that has long been implicated in insulin signal transduction in adipocytes. However, H2O2's role in mediating insulin's effects on the heart are unknown. OBJECTIVE: We investigated the role of H2O2 in activating insulin-dependent changes in cardiac myocyte metabolic and inotropic pathways. The sources of insulin-dependent H2O2 generation were also studied. METHODS AND RESULTS: In addition to the canonical role of insulin in modulating cardiac metabolic pathways, we found that insulin also inhibited beta adrenergic-induced increases in cardiac contractility...
September 13, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28916478/a-retrospective-study-of-pulseless-electrical-activity-bedside-ultrasound-identifies-interventions-during-resuscitation-associated-with-improved-survival-to-hospital-admission-a-reason-study
#16
Romolo Gaspari, Anthony Weekes, Srikar Adhikari, Vicki Noble, Jason T Nomura, Daniel Theodoro, Michael Woo, Paul Atkinson, David Blehar, Samuel Brown, Terrell Caffery, Emily Douglass, Jacqueline Fraser, Christine Haines, Samuel Lam, Michael Lanspa, Margaret Lewis, Otto Liebmann, Alexander Limkakeng, Fernando Lopez, Elke Platz, Michelle Mendoza, Hal Minnigan, Christopher Moore, Joseph Novik, Louise Rang, Will Scruggs, Christopher Raio
OBJECTIVE: Our objective was to determine whether organized or disorganized cardiac activity is associated with increased survival in patients who present in pulseless electrical activity (PEA) treated with either 1) standard advanced cardiac life support (ACLS) medications or 2) other interventions. METHODS: This was a secondary analysis of a prospective, multi-center observational study utilizing ultrasound in out-of-hospital or inemergency department PEA arrest...
September 12, 2017: Resuscitation
https://www.readbyqxmd.com/read/28912907/long-term-follow-up-of-autonomic-and-enteric-measures-in-patients-undergoing-vertical-banded-gastroplasty-for-morbid-obesity
#17
Neil E Crittenden, Hani Rashed, William D Johnson, George Cowan, David Tichansky, Atul Madan, Naeem Aslam, Teresa Cutts, Thomas L Abell
BACKGROUND: A multi-component model of autonomic and enteric factors may correlate with ultimate weight loss or gain after restrictive obesity surgery. This study aimed to determine relevant parameters to predict successful long-term weight loss. METHODS: Thirty-nine patients (four males and 35 females) with a mean age of 37.2 years were followed for over 15 years after vertical banded gastroplasty. Baseline adrenergic: postural adjustment ratio (PAR) and vasoconstriction (VC); cholinergic: electrocardiogram R-to-R interval (RRI) and enteric measure: electrogastrogram (EGG) were utilized by a discriminant function analysis to classify patients as a long-term loser or gainer...
August 2017: Gastroenterology Research
https://www.readbyqxmd.com/read/28905405/bioassay-determination-and-separation-of-enantiomers-of-atenolol-by-direct-and-indirect-approaches-using-liquid-chromatography-a-review
#18
REVIEW
Sonika Batra, Ravi Bhushan
Atenolol, a β-adrenergic receptor antagonist, is a chiral compound used for the treatment of cardiovascular diseases and to treat hypertension, coronary heart disease, arrhythmias, sinus tachycardia and myocardial infarction, where it acts preferentially upon the β-adrenergic receptors in the heart. It is marketed as a racemate, but only (S)-enantiomer of (RS)-atenolol is responsible for the β-adrenoceptor blocking activity. Different chromatographic methods have been applied for separation and determination of enantiomers...
September 14, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28905299/use-of-antihypertensive-drugs-and-risk-of-malignant-melanoma-a-meta-analysis-of-observational-studies
#19
REVIEW
Huilin Tang, Shuangshuang Fu, Suodi Zhai, Yiqing Song, Jiali Han
INTRODUCTION: Several antihypertensive drugs are photosensitizing and may promote the development of malignant melanoma (MM), but evidence remains inconsistent. We sought to quantify the association between use of antihypertensive drugs and MM risk. METHODS: We systematically searched PubMed, Embase, and CENTRAL from inception to August 17, 2017 to identify observational studies that reported the MM risk associated with the use of antihypertensive drugs. A random-effects meta-analysis was used to estimate the odds ratio (OR) with 95% confidence interval (CI)...
September 13, 2017: Drug Safety: An International Journal of Medical Toxicology and Drug Experience
https://www.readbyqxmd.com/read/28904461/the-prevalence-and-severity-of-autonomic-dysfunction-in-chronic-inflammatory-demyelinating-polyneuropathy
#20
Suresh Babu Pasangulapati, T V Murthy, Ajith Sivadasan, L Rynjah Gideon, A T Prabhakar, Aaron Sanjith, Vivek Mathew, Mathew Alexander
INTRODUCTION: In chronic inflammatory demyelinating polyneuropathy (CIDP), emphasis has been on motor disabilities, and autonomic dysfunction in these patients has not been addressed systematically. MATERIALS AND METHODS: Autonomic function was prospectively analyzed in 38 patients with CIDP. Quantitative autonomic function testing was done using Finometer(®) PRO and severity of adrenergic and cardiovagal dysfunction graded according to composite autonomic severity score and sudomotor dysfunction assessed using sympathetic skin response...
July 2017: Annals of Indian Academy of Neurology
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