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Fig. 1. Exposure to the active factor present in the hemolymph of early-molt stage
larvae triggers a dramatic decline in anterior foregut contraction amplitude.
(A) In saline, anterior foreguts isolated from nonmolting 5th instar larvae
respond to a 10 ms stimulation of the severed recurrent nerve with a large
amplitude contraction. Within a few minutes of exposure to the hemolymph
fraction from early-molt stage larvae, however, the amplitude of the elicited
contractions was markedly decreased. The response rebounded following a saline
wash. The anterior foregut contractions were recorded using a movement
transducer attached to the anterior esophageal constrictor muscles. (B)
Summary of the results (N=6; P<0.001, paired
t-test). In saline rinse we found that the average contraction
amplitude recovered and surpassed the initial control levels
(P<0.05, paired t-test). *Significant difference from
saline value.
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