Abstract
Changes in haemolymph proteins and lipoproteins during adipokinetic hormone action have been studied using polyacrylamide gel electrophoresis (PAGE) and a heparin/EDTA precipitation technique. During hormone action, the formation of A + takes place at the expense of Ayellow and C L-proteins, which decrease in free concentration in the haemolymph. Ayellow is heparin precipitable, whereas A + precipitates with EDTA after prior treatment with heparin. After injection of adipokinetic hormone, heparin-precipitable protein (HPP) decreases after a delay of 10–15 min, but heparin/EDTA precipitable protein (HEPP) increases immediately. These changes occur in response to extracts of corpora cardiaca and to synthetic adipokinetic hormone, and are dose-dependent. Both the lipid and the C L-protein content of the HEPP rise as its protein content increases. A + formation does not occur in fifth-instar nymphs or newly emerged adults, but this response to adipokinetic hormone develops slowly as the adults mature.
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