Abstract
The ovarian response of the imaginai molt decapitated cockroach, Blaberus craniifer, to nanomolar quantities of synthetic proctolin was evaluated. Sites binding anti-egg proteins were detected in the basal oocyte in 67% (18 out of 27) of the treated females, indicating that vitellogenin uptake is mediated by proctolin. The injected concentration of proctolin was consistent with a physiological role. The results suggest that proctolin, a putative neurotransmitter or neuromodulator, possibly acts on a non-excitable cell, the oocyte. At this level, the precise mechanism is discussed with respect to the calcium-dependent processes involved in both the proctolin myogenic effect and vitellogenin uptake in other species of cockroach.
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