Cited by 39Neurobiology and Insect Physiology ResearchDevelopmental Biology and Gene RegulationCircadian rhythm and melatonin

Ecdysone differentially regulates metamorphic timing relative to 20-hydroxyecdysone by antagonizing juvenile hormone in Drosophila melanogaster

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Ono, Hajime·2014·Developmental Biology

Abstract

In insects, a steroid hormone, 20-hydroxyecdysone (20E), plays important roles in the regulation of developmental transitions by initiating signaling cascades via the ecdysone receptor (EcR). Although 20E has been well characterized as the molting hormone, its precursor ecdysone (E) has been considered to be a relatively inactive compound because it has little or no effect on classic EcR mediated responses. I found that feeding E to wild-type third instar larvae of Drosophila melanogaster accelerates the metamorphic timing, which results in elevation of lethality during metamorphosis and reduced body size, while 20E has only a minor effect. The addition of a juvenile hormone analog (JHA) to E impeded their precocious pupariation and thereby rescued the reduced body size. The ability of JHA impeding the effect of E was not observed in the Methoprene-tolerant (Met) and germ-cell expressed (gce) double mutant animals lacking JH signaling, indicating that antagonistic action of JH against E is transduced via a primary JH receptor, Met, or a product of its homolog, Gce. I also found that L3 larvae are susceptible to E around the time when they reach their minimum viable weight. These results indicate that E, and not just 20E, is also essential for proper regulation of developmental timing and body size. Furthermore, the precocious pupariation triggered by E is impeded by the action of JH to ensure that animals attain body size to survive metamorphosis.

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  • Ecdysone accelerates metamorphic timing and results in elevation of lethality during metamorphosis in D. melanogaster, suggesting both 20E and E are essential for the regulation of metamorphic timing in D. melanogaster.

    “Although 20E is the active molting hormone and ecdysone is relatively inactive, E accelerates the metamorphic timing and results in elevation of lethality during metamorphosis in D. melanogaster, suggesting both 20E and E are essential for the regulation of metamorphic timing in D. melanogaster [72].”

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Research works printed but not linked: 2

  1. Nijhout, H.F., 1998. Insect Hormones. Princeton Univ. Press, Princeton, NJ.
  2. Sullivan, W., Ashburner, M., Hawley, R.S., 2000. Drosophila Protocols. Cold Spring Harbor Laboratory Press, New York.

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Authors
Ono, H.
Affiliations
Kyoto University (JP)
Corresponding author
Ono, Hajime
Venue
Developmental Biology
Publisher
Elsevier BV
Published
2014-07
Volume
391
Issue
1
Pages
32-42
ISSN
0012-1606 (ISSN-L)
OpenAlex
W2011425344
Cited by
39
References
57
Citations by year
2026: 2 · 2025: 4 · 2024: 4 · 2023: 4 · 2022: 4 · 2021: 2 · 2020: 4 · 2019: 1 · 2018: 3 · 2017: 2 · 2016: 2 · 2015: 5 · 2014: 2
FWCI
1.67
Type
journal article
Language
en
Open access
Locations
  • Developmental Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Institutional Repositories DataBase (IRDB) (submittedVersion)
  • Kyoto University Research Information Repository (Kyoto University) (submittedVersion)
Funders
  • Japan Society for the Promotion of Science
  • Asahi Glass Foundation
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurobiology and Insect Physiology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
Keywords
ecdysone, 20-hydroxyecdysone, juvenile hormone, metamorphosis timing, ecdysone receptor, methoprene-tolerant, juvenile hormone receptor, body size regulation, larval mortality, Drosophila melanogaster, developmental timing
MeSH terms
Animals, Dose-Response Relationship, Drug, Drosophila melanogaster, Ecdysone, Ecdysterone, Female, Juvenile Hormones, Larva, Male, Metamorphosis, Biological, Pupa, Time Factors, Signal Transduction, Gene Expression Regulation, Developmental, Drosophila Proteins, Animals, Genetically Modified, Body Size

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