keyword
MENU ▼
Read by QxMD icon Read
search

l-dopa

keyword
https://www.readbyqxmd.com/read/28430025/synthesis-of-dopamine-in-e-coli-using-plasmid-based-expression-system-and-its-marked-effect-on-host-growth-profiles
#1
Arunangshu Das, Anita Verma, Krishna J Mukherjee
L-Dopa and dopamine are important pathway intermediates towards the synthesis of catecholamine like epinephrine and norepinephrine from amino acid L-tyrosine. Dopamine, secreted from dopaminergic nerve cells, serves as an important neurotransmitter. We report the synthesis of dopamine by extending the aromatic amino acid pathway of E.coli DH5α by expression of 4-hydroxyphenylacetate-3-hydrolase (HpaBC) from E.coli and an engineered dopa decarboxylase (DDC) from pig kidney cell. The activity of HpaBC and DDC require 200 µM iron supplementation and 50 µM vitamin B6 respectively as additives to the growth media...
April 21, 2017: Preparative Biochemistry & Biotechnology
https://www.readbyqxmd.com/read/28429835/levodopa-prevents-the-reinstatement-of-cocaine-self-administration-in-rats-via-potentiation-of-dopamine-release-in-the-medial-prefrontal-cortex
#2
Silvia Antinori, Liana Fattore, Pierluigi Saba, Walter Fratta, Gian Luigi Gessa, Paola Devoto
Dopamine agonists have been proposed as therapeutic tools for cocaine addiction. We have recently demonstrated that indirect dopamine agonists, including levodopa (L-DOPA), markedly increase cocaine-induced dopamine release in the medial prefrontal cortex (mPFC) of rats leading to the suppression of cocaine-seeking behavior. This study was aimed to understand the behavioral and neurochemical effects of L-DOPA on cocaine-taking and cocaine-seeking in rats. After reaching a stable pattern of intravenous cocaine self-administration under a continuous fixed ratio (FR-1) schedule of reinforcement, male rats were treated with L-DOPA at different steps of the self-administration protocol...
April 21, 2017: Addiction Biology
https://www.readbyqxmd.com/read/28424060/effects-of-a-combination-treatment-of-kd5040-and-l-dopa-in-a-mouse-model-of-parkinson-s-disease
#3
Sora Ahn, Taek-Jin Song, Seong-Uk Park, Songhee Jeon, Jongpil Kim, Joo-Young Oh, Jaehwan Jang, Sanhwa Hong, Min-A Song, Hye-Seoung Shin, Young-Rim Jung, Hi-Joon Park
BACKGROUND: Although the dopamine precursor L-3, 4-dihydroxyphenylalanine ( l -dopa) remains the gold standard pharmacological therapy for patients with Parkinson's disease (PD), long-term treatment with this drug has been known to result in several adverse effects, including l -dopa-induced dyskinesia (LID). Recently, our group reported that KD5040, a modified herbal remedy, had neuroprotective effects in both in vitro and in vivo models of PD. Thus, the present study investigated whether KD5040 would have synergistic effects with l -dopa and antidyskinetic effects caused by l -dopa as well...
April 19, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28405912/continuous-transdermal-delivery-of-l-dopa-based-on-a-self-assembling-nanomicellar-system
#4
Amnon C Sintov, Haim V Levy, Igor Greenberg
PURPOSE: When levodopa (L-DOPA) is administered orally, it is eliminated from the body very quickly resulting in a series of sharp fluctuations in its blood concentrations. These frequent changes in blood levels are considered to be responsible for the development of late motor complications and dyskinesias, which are troubling clinical and treatment issues in Parkinson's disease. Transdermal drug delivery is a patient-compliant method for delivering therapeutics into the systemic circulation in a continuous and controlled manner...
April 12, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28400403/molecular-imaging-in-the-investigation-of-hypoglycaemic-syndromes-and-their-management
#5
David A Pattison, Rodney J Hicks
There has been recent progress in molecular imaging using a variety of cellular targets for the investigation of adult non-diabetic hypoglycaemic syndromes and its integration into patient management. These targets include peptide receptors - somatostatin receptors (SSTR) and glucagon-like peptide-1 receptor (GLP-1R) - the Amine Precursor Uptake and Decarboxylation system utilising the diphydroxyphenylaline (DOPA) analogue 6-[18F]-L-fluoro-L-3, 4-dihydroxyphenylalanine (18F-FDOPA), and glycolytic metabolism with 2-[18F]Fluoro-2-Deoxy-D-Glucose (FDG)...
April 11, 2017: Endocrine-related Cancer
https://www.readbyqxmd.com/read/28397192/effects-of-asarinin-on-dopamine-biosynthesis-and-6-hydroxydopamine-induced-cytotoxicity-in-pc12-cells
#6
Hyun Jin Park, Kyung Sook Lee, Ting Ting Zhao, Kyung Eun Lee, Myung Koo Lee
This study investigated the effects of asarinin on dopamine biosynthesis and 6-hydroxydopamine (6-OHDA)-induced cytotoxicity in rat adrenal pheochromocytoma (PC12) cells. Treatment with asarinin (25-50 μM) increased intracellular dopamine levels and enhanced L-DOPA-induced increases in dopamine levels. Asarinin (25 μM) induced cyclic AMP-dependent protein kinase A (PKA) signaling, leading to increased cyclic AMP-response element binding protein (CREB) and tyrosine hydroxylase (TH) phosphorylation, which in turn stimulated dopamine production...
April 10, 2017: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/28392421/phenylalanine-ammonia-lyase-from-arabidopsis-thaliana-atpal2-a-potent-enzyme-for-the-synthesis-of-non-canonical-aromatic-alpha-amino-acids-part-i-comparative-characterization-to-the-enzymes-from-petroselinum-crispum-pcpal1-and-rhodosporidium-toruloides-rtpal
#7
Alana Dreßen, Thomas Hilberath, Ursula Mackfeld, Arne Billmeier, Jens Rudat, Martina Pohl
Phenylalanine ammonia lyase (PAL) from Arabidopsis thaliana (AtPAL2) was comparatively characterized to the well-studied enzyme from parsley (PcPAL1) and Rhodosporidium toruloides (RtPAL) with respect to kinetic parameters for the deamination and the amination reaction, pH- and temperature optima and the substrate range of the amination reaction. Whereas both plant enzymes are specific for phenylalanine, the bifunctional enzyme from Rhodosporidium toruloides shows KM-values for L-Phe and L-Tyr in the same order of magnitude and, compared to both plant enzymes, a 10-15-fold higher activity...
April 6, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28392322/manipulation-of-dopamine-metabolism-contributes-to-attenuating-innate-high-locomotor-activity-in-icr-mice
#8
Takeshi Yamaguchi, Mao Nagasawa, Hiromi Ikeda, Momoko Kodaira, Kimie Minaminaka, Vishwajit S Chowdhury, Shinobu Yasuo, Mitsuhiro Furuse
Attention-deficit hyperactivity disorder (ADHD) is defined as attention deficiency, restlessness and distraction. The main characteristics of ADHD are hyperactivity, impulsiveness and carelessness. There is a possibility that these abnormal behaviors, in particular hyperactivity, are derived from abnormal dopamine (DA) neurotransmission. To elucidate the mechanism of high locomotor activity, the relationship between innate activity levels and brain monoamines and amino acids was investigated in this study. Differences in locomotor activity between ICR, C57BL/6J and CBA/N mice were determined using the open field test...
April 6, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28391443/non-human-primate-models-of-pd-to-test-novel-therapies
#9
REVIEW
Marc Morissette, Thérèse Di Paolo
Non-human primate (NHP) models of Parkinson disease show many similarities with the human disease. They are very useful to test novel pharmacotherapies as reviewed here. The various NHP models of this disease are described with their characteristics including the macaque, the marmoset, and the squirrel monkey models. Lesion-induced and genetic models are described. There is no drug to slow, delay, stop, or cure Parkinson disease; available treatments are symptomatic. The dopamine precursor, L-3,4-dihydroxyphenylalanine (L-Dopa) still remains the gold standard symptomatic treatment of Parkinson...
April 8, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/28390257/exploring-the-reactivity-of-retinol-radical-cation-toward-organic-and-biological-molecules-a-laser-flash-photolysis-study
#10
Ali El-Agamey, Thor B Melø, Hans-Richard Sliwka
Vitamin A (retinol) and various natural retinoids are essential for life. Under oxidative conditions, vitamin A radical cation (RET(+)) can be formed. Many deleterious effects were reported about the formation of carotenoid radical cations in biological environments, on the other hand, little is known about the consequences of the RET(+) formation in these environments. Therefore, it is important to explore the reactivity of RET(+) toward various biological substrates. Here, we employed nanosecond laser flash photolysis (LFP) to generate RET(+) (λmax=580nm in methanol) and examine its reactivity toward a wide range of biological molecules including amino acids, vitamins, carotenoids, naturally-occurring phenols, neurotransmitters such as catecholamines, wide range of phenol derivatives and some selected electron-donors...
March 14, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28390091/inhibition-of-tyrosinase-by-4h-chromene-analogues-synthesis-kinetic-studies-and-computational-analysis
#11
Edikarlos M Brasil, Luciana M Canavieira, Érica T C Cardoso, Edilene O Silva, Jerônimo Lameira, José L M Nascimento, Vera L Eifler-Lima, Barbarella de Matos Macchi, Dharmarajan Sriram, Paul V Bernhardt, José Rogério Araújo Silva, Craig M Williams, Cláudio N Alves
Inhibition of mushroom tyrosinase was observed with synthetic dihydropyrano[3,2-b]chromenediones. Among them, DHPC04 displayed the most potent tyrosinase inhibitory activity with a Ki value of 4μM, comparable to the reference standard inhibitor kojic acid. A kinetic study suggested that these synthetic heterocyclic compounds behave as competitive inhibitors for the L-DOPA binding site of the enzyme. Furthermore, molecular modeling provided important insight into the mechanism of binding interactions with the tyrosinase copper active site...
April 8, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28389587/l-dopa-in-dystonia-a-modern-perspective
#12
Roderick P P W M Maas, Tessa Wassenberg, Jean-Pierre Lin, Bart P C van de Warrenburg, Michèl A A P Willemsen
"Every child exhibiting dystonia merits an l-dopa trial, lest the potentially treatable condition of dopa-responsive dystonia (DRD) is missed" has been a commonly cited and highly conserved adage in movement disorders literature stemming from the 1980s. We here provide a historical perspective on this statement, discuss the current diagnostic and therapeutic applications of l-dopa in everyday neurologic practice, contrast these with its approved indications, and finish with our view on both a diagnostic and therapeutic trial in children and adults with dystonia...
April 7, 2017: Neurology
https://www.readbyqxmd.com/read/28389156/response-of-non-motor-symptoms-to-levodopa-in-late-stage-parkinson-s-disease-results-of-a-levodopa-challenge-test
#13
Margherita Fabbri, Miguel Coelho, Leonor Correia Guedes, Ines Chendo, Catarina Sousa, Mario M Rosa, Daisy Abreu, Nilza Costa, Catarina Godinho, Angelo Antonini, Joaquim J Ferreira
BACKGROUND: Non-motor symptoms (NMS) are extremely common among late-stage Parkinson's disease (LSPD) patients. Levodopa (L-dopa) responsiveness seems to decrease with disease progression but its effect on NMS in LSPD still needs to be investigated. OBJECTIVE: To assess the response of blood pressure (BP), pain, fatigue and anxiety to L-dopa in LSPD patients. METHODS: 20 LSPD patients, defined as Schwab and England ADL Scale <50 or Hoehn Yahr Stage >3 (MED ON) and 22 PD patients treated with subthalamic deep brain stimulation (advanced PD group) underwent an L-dopa challenge...
February 7, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/28379218/further-pharmacological-characterization-of-eltoprazine-focus-on-its-anxiolytic-anorexic-and-adverse%C3%A2-effect-potential
#14
Andreas Gravius, Andrzej Dekundy, Anita Vanaga, Lutz Franke, Wojciech Danysz
Eltoprazine, a drug that had previously been developed for aggression, has recently been investigated for L-DOPA-induced dyskinesia in animal models of Parkinson´s disease (PD) and in dyskinetic PD patients. Much less is known about effects of eltoprazine in other therapeutic indications. Indeed, the pharmacological profile of eltoprazine might suggest its effects on anxiety and food intake, but also adverse effect potential, which is the focus of the present study. Given for 2 weeks either as infusion or as twice-daily treatment, eltoprazine produced a decrease in food intake and body weight at doses leading to 200-500 nM plasma concentrations...
2017: Acta Neurobiologiae Experimentalis
https://www.readbyqxmd.com/read/28377741/adenosine-a2a-receptor-gene-knockout-prevents-l-3-4-dihydroxyphenylalanine-induced-dyskinesia-by-downregulation-of-striatal-gad67-in-6-ohda-lesioned-parkinson-s-mice
#15
Su-Bing Yin, Xiao-Guang Zhang, Shuang Chen, Wen-Ting Yang, Xia-Wei Zheng, Guo-Qing Zheng
l-3,4-Dihydroxyphenylalanine (l-DOPA) remains the primary pharmacological agent for the symptomatic treatment of Parkinson's disease (PD). However, the development of l-DOPA-induced dyskinesia (LID) limits the long-term use of l-DOPA for PD patients. Some data have reported that adenosine A2A receptor (A2AR) antagonists prevented LID in animal model of PD. However, the mechanism in which adenosine A2AR blockade alleviates the symptoms of LID has not been fully clarified. Here, we determined to knock out (KO) the gene of A2AR and explored the possible underlying mechanisms implicated in development of LID in a mouse model of PD...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28375049/delayed-o-methylation-of-l-dopa-in-mb-comt-deficient-mice-after-oral-administration-of-l-dopa-and-carbidopa
#16
Anne Tammimäki, Anu Aonurm-Helm, Pekka T Männistö
1. Catechol-O-methyltransferase (COMT) is involved in the O-methylation of L-DOPA, dopamine and other catechols. The enzyme is expressed in two isoforms: soluble (S-COMT), which resides in the cytoplasm, and membrane-bound (MB-COMT), which is anchored to intracellular membranes. 2. To obtain specific information on the functions of COMT isoforms, we studied how a complete MB-COMT deficiency affects the total COMT activity in the body, peripheral L-DOPA levels and metabolism after L-DOPA (10 mg kg(-1)) plus carbidopa (30 mg kg(-1)) administration by gastric tube in wild type and MB-COMT deficient mice...
April 4, 2017: Xenobiotica; the Fate of Foreign Compounds in Biological Systems
https://www.readbyqxmd.com/read/28371220/pain-correlates-with-sleep-disturbances-in-parkinson-s-disease-patients
#17
Yun-Ting Fu, Cheng-Jie Mao, Li-Jing Ma, Hui-Jun Zhang, Yi Wang, Jie Li, Jun-Ying Huang, Jun-Yi Liu, Chun-Feng Liu
OBJECTIVES: Both sleep disorders and pain decrease quality of life in Parkinson's disease (PD) patients. However, little is known about the relationship between objective sleep disturbances and pain in PD patients. This study aimed to (1) examine the clinical characteristics of pain in PD patients and (2) explore the correlation between pain and sleep disturbances in PD patients. METHODS: PD patients (N = 144) underwent extensive clinical evaluations of motor and nonmotor symptoms and characteristics of pain...
March 30, 2017: Pain Practice: the Official Journal of World Institute of Pain
https://www.readbyqxmd.com/read/28370430/reversible-folding-of-a-%C3%AE-hairpin-peptide-containing-a-metal-chelating-amino-acid
#18
Jan Reutzel, Timm Marian Diogo, Armin Geyer
5-(1-Hydroxy-pyridin-2(1H)-onyl) L-alanine (Hop) is a N-hydroxy-1,2-pyridone functionalized α-amino acid with the desired metal chelating properties of DOPA but without its unwanted redox activity. The Fmoc-protected amino acid Fmoc-L-Hop(tBu)-OH (11) was synthesized from glycine phosphonate followed by enzymatic hydrolysis of the methyl ester yielding the Hop L-isomer in 96% ee. The amino acid 11 is used in automated peptide synthesis for the assembly of a 14mer β-hairpin peptide with the sequence [dsb1,14]H-CHXETGKHGHKLVC-OH (X = W, L-Hop)...
April 3, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28369257/neuroimaging-and-clinical-features-in-adults-with-a-22q11-2-deletion-at-risk-of-parkinson-s-disease
#19
Nancy J Butcher, Connie Marras, Margarita Pondal, Pablo Rusjan, Erik Boot, Leigh Christopher, Gabriela M Repetto, Rosemarie Fritsch, Eva W C Chow, Mario Masellis, Antonio P Strafella, Anthony E Lang, Anne S Bassett
The recurrent 22q11.2 deletion is a genetic risk factor for early-onset Parkinson's disease. Adults with the associated 22q11.2 deletion syndrome (22q11.2DS) may exhibit phenotypes that could help identify those at highest risk and reveal disease trajectories. We investigated clinical and neuroimaging features relevant to Parkinson's disease in 26 adults: 13 with 22q11.2DS at genetic risk of Parkinson's disease (mean age = 41.5 years, standard deviation = 9.7), 12 healthy age and sex-matched controls, and a 22q11...
March 24, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28367136/reduced-ca2-ca3-hippocampal-subfield-volume-is-related-to-depression-and-normalized-by-l-dopa-in-newly-diagnosed-parkinson-s-disease
#20
Orsolya Györfi, Helga Nagy, Magdolna Bokor, Ahmed A Moustafa, Ivana Rosenzweig, Oguz Kelemen, Szabolcs Kéri
Hippocampal dysfunctions may play an important role in the non-motor aspects of Parkinson's disease (PD), including depressive and cognitive symptoms. Fine structural alterations of the hippocampus and their relationship with symptoms and medication effects are unknown in newly diagnosed PD. We measured the volume of hippocampal subfields in 35 drug-naïve, newly diagnosed PD patients without cognitive impairment and 30 matched healthy control individuals. Assessments were performed when the patients did not receive medications and after a 24-week period of l-DOPA treatment...
2017: Frontiers in Neurology
keyword
keyword
38364
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"