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Related Experiment Videos

Substrate phosphoprotein availability regulates eclosion hormone sensitivity in an insect CNS.

D B Morton, J W Truman

    Nature
    |September 18, 1986
    PubMed
    Summary

    Insect moulting relies on ecdysis, triggered by eclosion hormone. This study reveals that cyclic GMP (cGMP) signaling and specific protein phosphorylation regulate the nervous system's brief responsiveness to this hormone during insect development.

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    Area of Science:

    • Insect physiology
    • Molecular endocrinology
    • Developmental biology

    Background:

    • Ecdysis, the final stage of insect moulting, is a critical developmental process.
    • Eclosion hormone (EH) triggers ecdysis in Lepidoptera by acting on the nervous system.
    • The nervous system's responsiveness to EH is transient, occurring only during specific windows near moult completion.

    Purpose of the Study:

    • To investigate the molecular mechanisms underlying the transient neural responsiveness to eclosion hormone during insect moulting.
    • To identify the specific signaling pathways and proteins involved in mediating the effects of eclosion hormone.
    • To elucidate how the nervous system's sensitivity to eclosion hormone is regulated.

    Main Methods:

    • Utilized the tobacco hornworm, Manduca sexta, as a model organism for studying pupal ecdysis.

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  • Investigated the role of cyclic GMP (cGMP) as a second messenger in response to eclosion hormone.
  • Employed biochemical techniques to identify and characterize proteins phosphorylated downstream of cGMP signaling.

    • Main Results:

    • Eclosion hormone stimulation leads to an increase in cyclic GMP (cGMP) levels in the nervous system.
    • This cGMP increase mediates the phosphorylation of two specific proteins, each with a molecular mass of 54,000.
    • The transient presence of these phosphorylated substrate proteins correlates with the periods of neural competence to eclosion hormone.

    Conclusions:

    • The study identifies a novel mechanism for regulating hormonal responsiveness in the insect nervous system.
    • Transient protein phosphorylation, mediated by cGMP signaling, is crucial for the precise timing of ecdysis.
    • This provides new insights into the molecular control of developmental transitions in insects.