Search results for "choline"

Binding of a fluorescent dansylcadaverine-substance P analogue to negatively charged phospholipid membranes.

2000

Abstract We have investigated the binding of a new dansylcadaverine derivative of substance P (DNC-SP) with negatively charged small unilamellar vesicles composed of a mixture of phosphatidylcholine (PC) and either phosphatidylglycerol (PG) or phosphatidylserine (PS) using fluorescence spectroscopic techniques. The changes in fluorescence properties were used to obtain association isotherms at variable membrane negative charges and at different ionic strengths. The experimental association isotherms were analyzed using two binding approaches: (i) the Langmuir adsorption isotherm and the partition equilibrium model, that neglect the activity coefficients; and (ii) the partition equilibrium m…

Differences In Methacholine- And Adenosine 5-Monophosphate-Induced Changes In Forced Vital Capacity Between Methacholine-Responsive Subjects With All…

2012

Cholinergic-Adrenergic Presynaptic Interactions on the Heart in the Millisecond Range as Studied With the Pulse-to-Pulse Method

1988

A method has been devised to study the interactions of cholinergic and adrenergic nerves in the rabbit atria, a tissue known to be densely innervated by both vagus and sympathetic nerve fibres. The atria were isolated and perfused via the ascending branches of the coronary arteries. The acetylcholine (ACh) stores were labelled with [14C]-choline and the noradrenaline (NA) stores with [3H]-NA. The radioactive compounds were separated on columns and determined by scintillation spectrometry.

δ 1‐OPIOID receptor‐mediated controlofacetylcholine (ACh) release in human neocortex slices

1998

In slices of human neocortex, prelabelled with [3H]-choline, the release of [3H]-acetylcholine reflects the evoked release of endogenous acetylcholine which was elicited by the same electrical stimulation paradigm. [3H]-Acetylcholine release was depressed by the delta-opioid receptor agonist D-Pen2-D-Pen5-enkephalin. When the nerve endings were depolarized by elevating extracellular potassium the evoked [3H]-acetylcholine release was similarly depressed by D-Pen2-D-Pen5-enkephalin in the absence, but not in the presence, of tetrodotoxin which blocks action potential propagation. Therefore, the delta-opioid receptor inhibiting [3H]-acetylcholine release should not be located to cholinergic n…

Effect of histamine and histamine analogues on human isolated myometrial strips.

1992

1. The effect of histamine and histamine H1- and H2-receptor agonists on isolated myometrium strips of premenopausal women has been examined. The effect of acetylcholine was also determined. 2. Histamine, 2-pyridylethylamine, 4-methylhistamine and acetylcholine, but not dimaprit, produced a concentration-related contractile response in human isolated myometrial strips. Histamine also produced a further contraction in human isolated myometrial strips precontracted with KCl (55 mM). 3. The contractile response to histamine was antagonized by the histamine H1-receptor antagonist, clemizole (0.1 microM) but was potentiated by the histamine H2-receptor antagonist, ranitidine (10 microM). Clemizo…

Impact of insulin on microvascular blood flow and endothelial cell function in the postprandial state in patients with Type 1 diabetes.

2005

The aim of the present study was to investigate postprandial microvascular blood flow following a standardized test meal in nondiabetic subjects and in patients with Type 1 diabetes after regular insulin or insulin lispro. In this open-label, randomised cross-over study, 20 nondiabetic participants and 20 patients with Type 1 diabetes were enrolled. To valuate the postprandial time course of skin microvascular blood flow, laser Doppler flux (LDF) readings were obtained at baseline and every 30 min following a standardized test meal. Furthermore, the microvascular response to acetylcholine (Ach) was measured, and blood was collected for the measurement of serum insulin and blood glucose leve…

Microvascular skin blood flow following the ingestion of 75 g glucose in healthy individuals.

2009

It is expected that microvascular blood flow might be affected by blood glucose, blood insulin and C-peptide levels. In our investigation skin microvascular blood flow (LDF) was measured using laser doppler fluxometry at skin temperatures of 37 degrees C and 44 degrees C during a 75 g oral glucose load (OGT) or water in ten healthy volunteers (6 male, 4 female, age: 28.1+/-4.0) who had fasted overnight. The transcutaneous oxygen tension (tcPO2) was measured using a transcutaneous oxygen electrode at a temperature of 44 degrees C. The microvascular response to acetylcholine was investigated before the start of the ingestion period and after 30 minutes. In addition, the capillary blood cell v…

Neurochemical alterations in women with borderline personality disorder and comorbid attention-deficit hyperactivity disorder

2010

Borderline personality disorder (BPD) is associated with structural and functional brain changes. Recent models and findings refer to alterations of glutamate and total N-acetylaspartate (tNAA) in this condition.Absolute quantities of tNAA, creatine, glutamate, glutamine, myoinositol and total choline were measured using 3 Tesla magnetic resonance spectroscopy of the left anterior cingulate cortex and the left cerebellum in 14 unmedicated women with BPD and comorbid attention-deficit hyperactivity disorder (ADHD) and 18 healthy women. Both groups were matched with respect to age, education and premorbid intelligence.In the anterior cingulate, we found significantly higher tNAA and glutamate…

Pseudocholinesterases and human red cell acid phosphatases in Koreans.

1969

The authors reveal the results of pseudocholinesterase and human red cell acid phosphatase typings in a sample of 115 unrelated female Koreans aged from 20–30. No atypical pseudocholinesterase variants could be demonstrated. The frequencies of human red cell acid phosphatase alleles run up to: phA=0.231, phB=0.769, phC=0.000.

Once-daily tiotropium Respimat® 5 μg is an efficacious 24-h bronchodilator in adults with symptomatic asthma

2015

SummaryIntroductionOnce-daily tiotropium Respimat® 5 μg is an efficacious add-on therapy to inhaled corticosteroids (ICS) with or without long-acting β2-agonists in patients with symptomatic asthma. The objective of this study was to investigate whether the dosing regimen of tiotropium (once- versus twice-daily), delivered via the Respimat® SoftMist™ inhaler, affected 24-h bronchodilator efficacy and safety versus placebo Respimat® in patients with asthma who were symptomatic despite medium-dose ICS therapy.MethodsA randomised, double-blind, placebo-controlled, crossover study with 4-week treatment periods of tiotropium 5 μg (once-daily, evening) and 2.5 μg (twice-daily, morning and evening…