Abstract
ZELLER1 has shown that semicarbazide inhibits histaminase. We have found that this substance, added to Tyrode solution, potentiates the action of histamine on the guinea pig's ileum. The lowest concentration at which semicarbazide clearly potentiates histamine is of the order of 10−9. The optimum concentration is approximately 10−6, when the size of the histamine contractions may be doubled. Very high concentrations depress the effects of histamine. Potentiation is rapidly established and readily reversible. The accompanying record shows that semicarbazide selectively potentiates histamine, but has no similar effect on acetylcholine. Semicarbazide alone produces no contraction of the ileum, and the potentiation is probably due to inhibition of histaminase. Eserine, which inhibits, cholinesterase, potentiates the effect of acetylcholine on the ileum much more than that of histamine. Certain other inhibitors of histaminase also potentiate histamine. The most active compound hitherto found is 2-methyl-5-amino-methyl-6-amino-pyrimidine (B1 pyrimidine) which we have obtained through the kindness of Dr. Bergel, of Roche Products, Ltd. This compound potentiates histamine in a concentration of 2 × 10−10.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Zeller, E. A., “Adv. in Enzymology”, 2, 93 (1942).
Rocha e Silva, M., and Schild, H. O., J. Physiol., 109, 448 (1949).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
MONGAR, J., SCHILD, H. Potentiation of the Action of Histamine by Semicarbazide. Nature 167, 232–233 (1951). https://doi.org/10.1038/167232a0
Issue Date:
DOI: https://doi.org/10.1038/167232a0
This article is cited by
-
Diamine oxydase in rabbit small intestine: Separation from a soluble monoamine oxidase, properties and pathophysiological significance in intestinal ischemia
Agents and Actions (1975)
-
Histamine and its metabolism in mammals part II: Catabolism of histamine and histamine liberation
Agents and Actions (1975)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.