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DIURESIS FROM STIMULATION OF LEFT ATRIAL RECEPTORS: ADH AND THE MALPIGHIAN TUBULES OF RHODNIUS PROLIXUS
Author(s) -
Knapp Meryl F.,
Linden R. J.,
Pearson M. Joan
Publication year - 1981
Publication title -
quarterly journal of experimental physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 101
eISSN - 1469-445X
pISSN - 0144-8757
DOI - 10.1113/expphysiol.1981.sp002563
Subject(s) - rhodnius prolixus , diuresis , stimulation , malpighian tubule system , receptor , medicine , endocrinology , chemistry , biology , kidney , insect , ecology , botany , larva , midgut
Stimulation of left atrial receptors causes a diuresis partly through a blood borne agent. Malpighian tubules of Rhodnius prolixus can detect a blood borne agent during the diuresis. It has been suggested that the agent is ADH but this is in dispute. In the present investigation, vasopressin (1–300 µ i.u. cm ‐3 ) was found to have no effect on Malpighian tubule secretion when added to plasma, Rhodnius Ringer and Rhodnius Ringer +5‐HT. In addition, it was shown that incubation with sodium thioglycollate of plasma samples obtained from anaesthetized dogs, before and during stimulation of atrial receptors by distension of a balloon in the lumen of the left atrium, did not abolish the differences between test and control plasma samples detected by the Malpighian tubules. It is concluded that differences in plasma detected by the Malpighian tubules and related to the diuresis which results from left atrial stimulation are not attributable to changes in concentration of ADH.