Pulmonary circulation could be one of the primary vascular targets of finest particles that can deeply penetrate into the lungs after inhalation. We investigated the effects of engineered nanoparticles on vasomotor responses of small intrapulmonary arteries using isometric tension measurements. Acute in vitro exposure to carbon nanoparticles (CNP) decreased, and in some case abolished, the vaso...

PURPOSE The location of acetylcholinesterase-containing nerve fibers suggests a role for acetylcholine in both contractility and secretion in the prostate gland. The colocalization of nitrergic nerves with cholinergic nerves, and the cotransmission of nitric oxide with acetylcholine in cholinergic nerves, has been demonstrated in the prostate glands of various species. Thus, we investigated the...

BACKGROUND Reduced synthesis of endothelium-derived relaxing factor (EDRF) may explain impaired endothelium-dependent vasodilation in hypercholesterolemia. Accordingly, we designed studies to determine if endothelium-dependent relaxation in hypercholesterolemic rabbits may be restored by supplying L-arginine, the precursor of EDRF. METHODS AND RESULTS Normal or hypercholesterolemic rabbits re...

Anethum graveolens L. is a member of the Apiaceae family and more commonly known as dill. Dill has been used for gastrointestinal ailments such as flatulence, indigestion, stomach ache and colic. It has therapeutic effects such as mucosal protective, antisecretory, antimicrobial, antispasmodic, antihypercholesterolaemic and antihyperlipidaemic. The aim of our study was to examine the effects of...

introduction: our previous studies showed that hydroalcoholic extract of leaf of vitis vinifera relaxes the phenylephrine-induced contraction in rat thoracic aorta. this effect was dependent on endothelial integrity and no-cgmp system. the vasorelaxant effect of extract was much lesser on kcl-induced contraction. we, therefore, postulated that k+ channels are involved. the main aim of the prese...

it has been reported that rosa damascena hydroalcoholic extract has inhibitory effect at higher concentration but stimulatory action at lower concentrations on ileum. this could be due to the presence of stimulatory components in the extract. r. persica mich. is another species which belongs to rose family but so far there is no report about pharmacological action of its extract. therefore, the...

The aim of this study was to find out lead interaction on acetylcholine-induced ileal (0.8 "to 1" longitudinal total strips) contractions in varying calcium (Ca++) or magnesium (Mg++) media and the cholinergic mechanism. Potentiation of ileal strips by lead (Pb++) remained dose-dependent as elicited by acetylcholine-induced contractions (1.81 x 10(-6) M to 1.28 x 10(-4) M). These were completel...

The author provides a review of the mechanism of neuromuscular transnission, as well as the Nechanisn of action and differences between curare and succinylcholine. Effects of these two relaxants on various organs and tissues are discussed, as are their onset of action, duration, elimination, and clinical uses. In order to understand how skeletal muscle re-laxants act, the mechanism of neuromusc...

The purpose of the present experiments was to examine the mechanism of the proventricular dilatation caused by lead in the isolated vagus nerve-proventricular smooth muscle preparation of the chick. Lead caused dose- and time-dependent inhibition of contractions induced by vagal stimulation, transmural stimulation and externally applied acetylcholine (ACh). Vagally evoked contraction was much m...

Objective tinnitus can have many different etiologies, palatal myoclonus being one of the less frequent. This type of tinnitus is generated by involuntary rhythmic contraction of the soft palate, which generates an audible click for the patient and for the explorer. Botulinum toxin achieves temporary muscle paralysis through presynaptic inhibition of the acetylcholine level at the neuromuscular...