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• W2039571485 abstract "Secretion of ecdysteroid molting hormones by crustacean Y-organs is negatively regulated (inhibited) by molt-inhibiting hormone (MIH), a neuropeptide produced by neurosecretory cells in eyestalk ganglia. The inhibitory effect of MIH is mediated by one or more cyclic nucleotide second messengers. In addition, available data indicate that ecdysteroidogenesis is positively regulated (stimulated) by intracellular calcium. However, despite the apparent critical role of calcium in regulating ecdysteroidogenesis, the level of Ca(2+) in Y-organs cells has not been previously determined. In studies reported here, eyestalks were ablated from blue crabs (Callinectes sapidus) to remove the endogenous source of MIH and activate Y-organs. At 0, 3, 6, and 9 days after eyestalk ablation (D0, D3, D6, and D9, respectively), the level of Ca(2+) in Y-organ cells was determined using a fluorescent calcium indicator (Fluo-4), and the hemolymphatic ecdysteroid titer was determined by radioimmunoassay. Calcium fluorescence in D6 Y-organs was 3.5-fold higher than that in D0 controls; calcium fluorescence in D9 Y-organs was 3.9-fold higher than in D0 controls (P<0.05). Measurement of fluorescence along a transect drawn through representative cells indicated that the calcium fluorescence was localized to cytoplasm and not to nuclei. Associated with the increase in intracellular Ca(2+) was a significant increase in the hemolymphatic ecdysteroid titer: The level of ecdysteroids in hemolymph rose from 5.5 ng/mL on D0 to 49.6 ng/mL on D6 and 87.2 ng/mL on D9 (P<0.05). The results are consistent with the hypothesis that ecdysteroidogenesis is stimulated by an increase in intracellular Ca(2+)." @default.
• W2039571485 created "2016-06-24" @default.
• W2039571485 creator A5003437102 @default.
• W2039571485 creator A5073038481 @default.
• W2039571485 date "2010-10-11" @default.
• W2039571485 modified "2023-10-09" @default.
• W2039571485 title "Changes in intracellular calcium concentration in crustacean (Callinectes sapidus) Y-organs: relation to the hemolymphatic ecdysteroid titer" @default.
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• W2039571485 doi "https://doi.org/10.1002/jez.646" @default.
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