Summary
Cell lines derived from embryos of the tobacco hornworm,Manduca sexta (L.), showed a marked morphological response to treatment with physiological doses of β-ecdysone. The response of these cell lines with α-ecdysone indicated that the penta-ol (α-ecdysone) must be converted to the hexa-ol (β-ecdysone) form before the morphological response can appear. Liquid chromatographic analysis of the spent medium confirmed that the cells converted the α-ecdysone to β-ecdysone in amounts that exceeded the threshold level for a biological response. Constant exposure to β-ecdysone produced a cell line that was resistant to the killing effect of β-ecdysone and failed entirely to respond to the presence of α-ecdysone.
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Most of the experimental work for this study was done at the Biological Laboratories of Harvard University while the senior author was on sabbatical leave from the Metabolism and Radiation Research Laboratory. The research employed facilities supported by grants made by NIH and NSF to Professor C. M. Williams.
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Marks, E.P., Holman, G.M. Ecdysone action on insect cell lines. In Vitro 15, 300–307 (1979). https://doi.org/10.1007/BF02618955
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DOI: https://doi.org/10.1007/BF02618955