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- W2045154486 abstract "The in vitro activation of isolated prothoracic glands from Sarcophaga argyrostoma (Robineau-Desvoidy) was accomplished with extracts of prepupal brains. The action of prothoracicotropic hormone (PTTH) could be mimicked by the use of cAMP analogues and a phosphodiesterase inhibitor, suggesting the involvement of a cyclic nucleotide-mediated secondary messenger system. This was further supported by the removal of calcium ions thereby lowering the effect of the PTTH extracts in vitro. Cyclic GMP and its derivatives had no effect on ecdysone synthesis. The PTTH extract from Sarcophaga was found to be equally effective at stimulating the production of ecdysone by isolated Calliphora vicina (Meigen) ring glands. The nature and time course of ring gland competency in diapause in both Sarcophaga and Calliphora was investigated. As the Sarcophaga population entered pupal diapause at 96 h after pupariation at 18°C, the prothoracic glands became refractory to PTTH, taking 24 h to lose their competency to respond to this hormone. The levels of ecdysone produced were below the limits of detection of the radioimmunoassay used. The glands could not be stimulated by 10 mM cyclic nucleotides indicating that the block of PTTH action occurred beyond the proposed stage of cyclic nucleotide mediation. The Calliphora population, which has a larval diapause, took 6 days to reach this refractory state. Their prothoracic glands continued to produce ecdysone at the basal rate throughout diapause and this basal rate could not be altered by the application of PTTH or cyclic nucleotides. Following a temperature increase from 11 to 25°C, all diapausing Calliphora had regained prothoracic gland competency within 24 h and had pupariated within 36 h. When isolated brain-ring gland complexes from diapausing Calliphora were incubated at 25°C, no recovery of ring gland competency was noted, indicating the requirement for in vivo reactivation after diapause. The levels of PTTH in pre-diapause and day-35 post-pupariation diapause brains of Sarcophaga were shown to be similar to those of non-diapause destined prepupal brains." @default.
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- W2045154486 date "1987-01-01" @default.
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- W2045154486 title "Prothoracic gland function in diapause and non-diapause Sarcophaga argyrostoma and Calliphora vicina" @default.
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- W2045154486 doi "https://doi.org/10.1016/0022-1910(87)90016-3" @default.
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