Abstract
Paraldehyde fuchsin (PAF) stained serial sections of the brain were examined for neurosecretory material (NSM) during adult ovarian development and in 10-day-old ovariectomized adult Acheta domesticus L. Type I neurosecretory cells of the pars intercerebralis were relatively low in NSM for the first 3 days of adult life, including the period during which vitellogenin synthesis and uptake are initiated. As mature oocytes accumulate after Day 4, NSM accumulates in the brain, reaching a peak by about Day 10. Ten-day-old adults ovariectomized as last instar larvae contained dramatically less brain NSM than intact controls, and injection of 0.48 μg of ecdysterone into ovariectomized crickets partially restored the brain to a state resembling that of intact animals. Peptides from the brains and corpora cardiaca-corpora allata complexes of intact and ovariectomized animals were separated by SDS-polyacrylamide gel electrophoresis and their PAF stainability was analyzed. Ovariectomy resulted in a decrease in the amounts of 12 brain peptides, but these showed little or no preferential staining with PAF. The possibility of regulatory interactions between the brain and ovaries is discussed.
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