Abstract
Prolonged incubation of corpora allata (CA) of Locusta migratoria in calcium-free medium in vitro did not result in a significant reduction in juvenile hormone (JH) release; however, high rates of juvenile hormone release were precluded. Incubation with the ionic calcium channel blocker, lanthanum, also did not effect a reduction, and, in this case, high release rates were not precluded. In contrast, incubation with the ionophore A23187 resulted in a substantial stimulation of juvenile hormone release which lasted for up to 3 h. This stimulation appeared to be attributable specifically to the influx of calcium ions since it did not occur in calcium-free medium. Measurement of juvenile hormone content of stimulated and unstimulated glands revealed that the increase in release reflected an increase in juvenile hormone biosynthesis. Calcium influx was not associated with a change in the cyclic AMP content of glands and incubation with forskolin and cyclic AMP analogues did not result in a stimulation of juvenile hormone release.
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