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Related Experiment Videos

Insect prothoracicotropic hormone: evidence for two molecular forms.

W E Bollenbacher, E J Katahira, M O'Brien

    Science (New York, N.Y.)
    |June 15, 1984
    PubMed
    Summary

    Two forms of prothoracicotropic hormone (PTTH) regulate insect development in Manduca sexta. These PTTH forms activate prothoracic glands differently, showing stage-specific sensitivity crucial for growth regulation.

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    Area of Science:

    • Insect endocrinology
    • Developmental biology
    • Neurohormone function

    Background:

    • Postembryonic development in insects is primarily regulated by prothoracicotropic hormone (PTTH).
    • PTTH is a cerebral neuropeptide essential for triggering molting and metamorphosis.
    • The tobacco hornworm, Manduca sexta, serves as a model organism for studying insect development.

    Purpose of the Study:

    • To investigate the distinct functions of the two molecular forms of PTTH.
    • To determine how changes in prothoracic gland sensitivity affect developmental responses.
    • To elucidate the role of the PTTH neuroendocrine axis in regulating insect growth and development.

    Main Methods:

    • In vitro dose-response assays to measure prothoracic gland activation by PTTH.

    Related Experiment Videos

  • In situ bioassays to assess PTTH activity within the insect.
  • Comparative analysis of PTTH effects across different developmental stages.

    • Main Results:

    • Two distinct molecular forms of PTTH were identified in Manduca sexta.
    • Each PTTH form elicited stage-specific dose responses in prothoracic gland activation.
    • Prothoracic glands exhibited varying sensitivity to PTTH throughout development.
    • Both PTTH forms demonstrated activity in in situ bioassays.

    Conclusions:

    • The two PTTH molecular forms play distinct roles in regulating insect development.
    • Stage-specific release of PTTH likely evokes different developmental outcomes.
    • The PTTH neuroendocrine axis is a key system for understanding neurohormone function in development.