[Influence of the pars intercerebralis and of median sub-ocellar neurosecretory cells on the concentration of vasopressin-like substance in the ventral nerve cord and haemolymph of Locusta migratoria (Orthoptera). Radioimmunoassay and immunohistology (author's transl)].

1 degree In the migratory locust, electrocoagulation of the neurosecretory cells of the pars intercerebralis increases the rate of water elimination, while electrocoagulation of the median sub-ocellar neurosecretory cells elicits a marked water retention. 2 degrees In the first type of experiment, high concentrations of molecules antigenically close to vasopressin can be measured by RIA in the haemolymph; such molecules are practically undetectable in the blood when median sub-ocellar neurosecretory cells are suppressed. 3 degrees Our data lead us to assume that the vasopressin-like molecules detected in the migratory locust promote water elimination.