T-cell suppression and contrasuppression induced by histamine H2 and H1 receptor agonists, respectively.
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چکیده
منابع مشابه
Interactions of histamine H1-receptor agonists and antagonists with the human histamine H4-receptor.
The human histamine H(4)-receptor (hH(4)R) possesses high constitutive activity and, like the human H(1)-receptor (hH(1)R), is involved in the pathogenesis of type-I allergic reactions. The study aims were to explore the value of dual H(1)/H(4)R antagonists as antiallergy drugs and to address the question of whether H(1)R ligands bind to hH(4)R. In an acute murine asthma model, the H(1)R antago...
متن کاملConjunctival eosinophil infiltration evoked by histamine and immediate hypersensitivity. Modification by H1- and H2-receptor blockade.
The present histological studies have demonstrated that histamine causes dose-dependent eosinophil infiltration into the conjunctiva. A highly directional movement toward the conjunctival epithelium was observed, and the presence of large numbers of degranulating eosinophils appeared to result in epithelial cell damage and goblet cell discharge. Blockade of H2-receptors by systemic cimetidine p...
متن کاملEffects of intracerebroventricular injection of histamine and H1, H2 receptor antagonists on electrocardiographic parameters in broiler chickens
The aim of this study was to assess the effects of exogenous histamine and H1 and H2 central receptorson electrocardiographic (ECG) parameters, heart rate and mean electrical axis in broiler chickens. For thispurpose, Ross broiler chickens (750-800 g weight) received intracerebroventricularly (ICV) histamine.Moreover, to determine the receptors involved in histamine-induced alterations in ECG c...
متن کاملاثر آگونیست ها و آنتاگونیست های مختلف گیرنده هیستامینی بر آستانه درد ایجاد شده با صفحه داغ و Writhing شکمی در موش ها
Background and purpose: Histamine is a neurotransmitter present in the brain of mammals which produces its physiological effects on target cells by stimulation of three types of receptors H1, H2 and H3. Various reports nowadays indicate the role of histamine in reduction of pain transmission. This study was designed to determine the role of histamine receptors in reduction of pain. Mate...
متن کاملEmotional memory consolidation impairment induced by histamine is mediated by H1 but not H2 receptors
Histaminergic fibers are present in the molecular and granular layers of the cerebellum and have high density in the vermis and flocculus. Evidence indicates that the cerebellar vermis is involved in memory consolidation. Recently, we demonstrated that when histamine is microinjected into the cerebellar vermis it results in impaired emotional memory consolidation in mice that are submitted to t...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1982
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.79.16.5052