OBJECTIVE Crocin and safranal, as the major constituents of saffron, have many biological activities. This study investigated the effects of crocin and safranal on yawning response induced by intracerebroventricular (i.c.v.) injection of histamine in rats. MATERIALS AND METHODS In ketamine/xylazine-anesthetized rats, a guide cannula was implanted in the right ventricle of the brain and yawnin...

Much information has now accumulated which favors the idea that histamine participates in the peripheral sensory function. Kwiatkowski (1) has shown that sensory nerve fibers of the skin is more rich in histamine than the motor nerve fibers and has further demonstrated directly that histamine is liberated after antidromic stimulation of the sensory nerve trunks. Experimental evidences have been...

The present study investigated whether histamine was taken up by perivascular adrenergic nerves and released by periarterial nerve stimulation (PNS) to induce vascular responses. In rat mesenteric vascular beds treated with capsaicin to eliminate calcitonin gene-related peptide (CGRP)ergic vasodilation and with active tone, PNS (1 - 4 Hz) induced only adrenergic nerve-mediated vasoconstriction....

Study was made of the developmental mechanism of histamine induced ulcers and inhibitory effects of receptor antagonists from the view point of gastric acidity and microvasculature of the gastric mucosa, and the following results were obtained. 1. In histamine induced ulcers, hypersecretion of gastric acid caused by histamine is not the primary developmental mechanism of the lesion. The main ca...

background: high levels of histamine and dopamine are found in the hippocampus. furthermore, interaction between histamine and dopaminergic d2 receptors has been demonstrated in the modulation of some behaviors. in the present study, interaction between histamine and dopaminergic d2 receptor in the dorsal hippocampus in the anxiety behavior has been investigated. methods: in this experimental s...

The methanol extract of Caesalpinia bonducella leaves were investigated for anti-inflammatory, analgesic and antipyretic activity at the doses of 50, 100 and 200 mg/kg, body weight. The experimental paradigms used were carrageenan, dextran, histamine induced pedal edema and cotton pellet induced granuloma for anti-inflammatory activity, while hot plate and acetic acid induced writhing methods w...

We tested the hypothesis that the solvent for etomidate was a factor in the incidence of pain and other side effects after injection, and that these were associated with histamine release. Nine of 10 volunteers who received etomidate in a propylene glycol formulation reported moderate to severe pain on injection; only one of 10 subjects who received a lipid emulsion formulation reported mild pa...

Introduction: The protective and antisecretory effects of dopamine agonists on the stomach have been already reported, but the effect of bromocriptine (D2 dopamine agonist) on histamine stimulated gastric acid secretion (GAS) needs to be investigated. Methods: For gastric sampling, animals were anesthetized and a polyethylen tube was introduced into the stomach through esophagus. A cannula ...

BACKGROUND Hybanthus enneaspermus (HE) leaves are being used traditionally to relieve pain, and scientific studies have demonstrated their analgesic potential. This study attempted to elucidate the pharmacological mechanism(s) involved in the analgesic action of ethanol extract of H. enneaspermus leaves (EEHE). MATERIALS AND METHODS Forty-two male Wistar rats were separately randomized into s...

BACKGROUND Mast cell-derived histamine is known to act on dermal fibroblasts and contribute to formation of an intractable chronic allergic dermatitis. Although this fibrotic event may also occur in other organs such as the nasal mucosa, no direct evidence has been reported as to whether responsiveness to histamine by fibroblasts derived from different organs is of the same intensity. Furthermo...