Injection of heparin as well as antigenic challenge in sensitized guinea pigs are known to produce a release of histaminase into the plasma. In the present study, tissue histaminase estimation was done by Spencer's method (17) and plasma estimation by Kapellar Adler's (7) method. Mepyramine pretreatment considerably decreased the histaminase release by both heparin and anaphylaxis. Mepyramine d...

In the present study, effects of intracerebroventricular (icv) administration of histamine, mepyramine (H1-receptor antagonist) and famotidine (H2-receptor antagonist) have been investigated on the formalin test in rats. Subcutaneous injection of formalin (50 microl, 1%) into the ventral surface of the left hind paw produced a marked biphasic pain response (first phase: 0-5 min and second phase...

With large numbers of hydroxyl groups, the trimethylsilyl derivatives become too large in mass for the range of many quadrupole mass spectrometers, so methylation is used. However, this would cause problems in structural elucidation since those compounds in which demethylation of the methoxyl or dimethylamino group had taken place would be remethylated, thus obscuring these demethylating proces...

The pharmacological reactivity of guinea pig ileum to ethanol leaf extract of Amaranthus caudatus and Solanum melongena were determined in vitro. Parameters evaluated include the threshold value and the concentration ratio (CR). The potency of the plant extracts as expressed by EC50, the Emax (maximum response) and its corresponding concentration were determined from the concentration response ...

in the present study, the effects of intracerebroventricular (icv) administration of normal saline (control), histamine, mepyramine (a histamine h1-receptor antagonist) and ranitidine (a histamine h2-receptor antagonist) were investigated on the formalin-induced pain in rabbits. subcutaneous (sc) injection of a formalin (100 μl, 5%) solution into the ventral surface of the right hind paw was pe...

In the present study, the effects of intracerebroventricular (ICV) administration of normal saline (control), histamine, mepyramine (a histamine H1-receptor antagonist) and ranitidine (a histamine H2-receptor antagonist) were investigated on the formalin-induced pain in rabbits. Subcutaneous (SC) injection of a formalin (100 μl, 5%) solution into the ventral surface of the right hind paw was pe...

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...

Different brain areas seem to be involved in the cardiovascular responses to stress. The medial amygdala (MeA) has been shown to participate in cardiovascular control, and acute stress activates the MeA to a greater extent than any of the other amygdaloid structures. It has been demonstrated that the brain histaminergic system may be involved in behavioral, autonomic and neuroendocrine response...

Strips of tissue from knuckle pads contract in response to the myofibroblast stimulant mepyramine in a reversible, repeatable and dose-dependent manner. The significance of this finding is discussed.

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...