QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by MADDRELL, S. H. P. Articles by GEE, J. D. Search for Related Content PubMed PubMed Citation Articles by MADDRELL, S. H. P. Articles by GEE, J. D.

Journal of Experimental Biology 61,155-171 (1974)
Published by Company of Biologists 1974

Potassium-Induced Release of the Diuretic Hormones of Rhodnius Prolixus and Glossina Austeni: Ca Dependence, Time Course and Localization of Neurohaemal Areas

S. H. P. MADDRELL ¹ and J. D. GEE ¹

¹ The A.R.C. Unit of Invertebrate Chemistry and Physiology and Department of Zoology, Downing Street, Cambridge

1. Exposure of neurohaemal areas to solutions of elevated K concentration (above 40 mM) causes a maximal release of diuretic hormone in Rhodnius prolixus and Glossina austeni.

2. An involvement of Ca in hormone release is indicated by the reduction caused by low concentrations of this cation (below 2 mM) or by the presence of Mn.

3. During prolonged treatment with K-rich solutions the rate of hormone release is initially high, but then declines. This response parallels that for Ca entry into squid giant axons during maintained potassium depolarization and suggests that the rate of Ca entry controls the rate of hormone release.

4. Tetrodotoxin did not reduce the potassium-induced release of the hormone, suggesting that K acts directly on the neurosecretory axon endings in the neurohaemal areas.

This article has been cited by other articles:

				N. Tublitz and J. Truman Intracellular stimulation of an identified neuron evokes cardioacceleratory peptide release Science, May 24, 1985; 228(4702): 1013 - 1015. [Abstract] [PDF]