A reappraisal of the hormonal regulation of larval fat body histolysis in femaleDrosophila melanogaster |
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Authors: | D. S. Richard A. E. Arnim L. I. Gilbert |
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Affiliation: | (1) Department of Biology, Coker Hall CB No. 3280, University of North Carolina at Chapel Hill, 27599-3280 Chapel Hill, North Carolina, USA |
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Abstract: | The histolysis of larval fat body cells in adult femaleDrosophila melanogaster was examined in wild type and mutant animals. The fat body cells of wild type (Canton-S),apterous56f homozygotes,apterous78jts homozygotes and heterozygotes,apterous4/+, ecdysoneless1 homozygotes and heterozygotes all underwent histolysis normally during the 72 h following adult eclosion. Only in the case ofap4/ap4 adults did the cells fail to histolyze normally. The fat body cells of both diapausing and non-diapausing wild type females underwent histolysis at the same rate. Attempts to demonstrate histolysis in vitro were unsuccessful, even in the presence of juvenile hormones (JHs), larval ring glands, or adult ovaries. In all strains other than theap4 homozygotes, a significant proportion of larval fat body cells were dead at any time while theap4/ap4 animals, almost all cells remained viable. It is postulated that fat body cell lysis following eclosion is not a JH-mediated event, but is elicited by an as yet unidentified factor(s), possibly originating in the ovary. |
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Keywords: | Cell death juvenile hormone endocrine mutants diapause |
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