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Related Experiment Videos

Tyramine injections reduce locust viability.

H Torfs1, W Van Poyer, J Poels

  • 1Department of Biology, Laboratory for Developmental Physiology and Molecular Biology, K.U. Leuven, Zoological Institute, Belgium.

Acta Biologica Hungarica
|October 18, 2000
PubMed
Summary

Tyramine injections negatively impacted locusts, reducing larval viability and adult egg production. These effects suggest tyramine may act on tyramine receptors, similar to certain insecticides.

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Microarray-based annotation of the gut transcriptome of the migratory locust, Locusta migratoria.

Insect molecular biology·2016

Area of Science:

  • Neurobiology
  • Insect Physiology
  • Pharmacology

Background:

  • Tyramine is a precursor to octopamine and can activate octopamine receptors.
  • Specific tyramine receptors have been identified in insects, suggesting a role as a neurotransmitter or modulator.

Purpose of the Study:

  • To investigate the effects of repeated tyramine administration on locusts.
  • To explore potential mechanisms underlying tyramine's effects, including interactions with tyramine receptors.

Main Methods:

  • Repeated injections of tyramine into last instar larvae of Locusta and Schistocerca.
  • Observation and recording of larval viability, ecdysis timing, and adult female reproductive output (egg deposition).

Main Results:

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  • Repeated tyramine injections significantly reduced larval viability in both locust species.
  • Sublethal effects included delayed final ecdysis in larvae and reduced/delayed egg deposition in adults.
  • Observed effects resemble those of known octopamine receptor agonists like formamidines.

    • Conclusions:

    • Tyramine administration has detrimental effects on locust development and reproduction.
    • These effects may be mediated through interactions with specific tyramine receptors, similar to some insecticidal compounds.
    • Tyramine's role as a neurotransmitter/modulator warrants further investigation, particularly concerning its receptor interactions.