H2 receptor blockade and bronchial hyperreactivity to histamine in asthma.
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چکیده
منابع مشابه
H2 receptor blockade and bronchial hyperreactivity to histamine in asthma.
The role of histamine H1 and H2 receptors in the lung is not clear. H1 receptor blockade results in bronchodilatation and inhibition of histamine induced bronchoconstriction. H2 receptor blockade in vitro prevents the normal negative feedback of histamine on further mediator release in antigen challenge. Bronchospasm in guinea pigs given antigen challenge is enhanced by previous administration ...
متن کاملENHANCED HISTAMINE H I RECEPTOR BLOCKADE WITH CHLORPHENIRAMINE IN THE ASTHMATIC TRACHEO-BRONCHIAL TREE: FURTHER EVIDENCE FOR INCREASED DRUG DELIVERY IN ASTHMA
We have measured the competitive antagonistic effect of chlorpheniramine in bronchi of 8 normal and 12 asthmatic subjects. Classical pharmacological theory states that the degree of competitive antagonism depends only upon 1) antagonist concentration at the receptor, and 2) receptor affinity. Delivery and affinity also influence agonist responsiveness, but measurement of bronchial antagoni...
متن کاملenhanced histamine h i receptor blockade with chlorpheniramine in the asthmatic tracheo-bronchial tree: further evidence for increased drug delivery in asthma
we have measured the competitive antagonistic effect of chlorpheniramine in bronchi of 8 normal and 12 asthmatic subjects. classical pharmacological theory states that the degree of competitive antagonism depends only upon 1) antagonist concentration at the receptor, and 2) receptor affinity. delivery and affinity also influence agonist responsiveness, but measurement of bronchial antagonism al...
متن کاملHistamine H2 receptor trafficking: role of arrestin, dynamin, and clathrin in histamine H2 receptor internalization.
Agonist-induced internalization of G protein-coupled receptors (GPCRs) has been implicated in receptor desensitization, resensitization, and down-regulation. In the present study, we sought to establish whether the histamine H2 receptor (H2r) agonist amthamine, besides promoting receptor desensitization, induced H2r internalization. We further studied the mechanisms involved and its potential r...
متن کاملINCREASED HISTAMINE Hi RECEPTOR BLOCKADE BY CHLORPHENIRAMINE IN TRACHEAL CHAINS OF ASTHMATIC GUINEA PIGS
Receptor affinity and drug delivery to the receptor sites could be determinant factors for the increased bronchial responsiveness seen in asthma. Competitive antagonism blockade which is measured as dose ratio-l (DR-I) depends only on these two factors. Therefore, in this study we have examined histamine HI blockade by chlorpheniramine on isolated tracheal chains of asthmatic compared to co...
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ژورنال
عنوان ژورنال: Thorax
سال: 1981
ISSN: 0040-6376
DOI: 10.1136/thx.36.4.268