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Related Experiment Videos

Odorant-sensitive phospholipase C in insect antennae.

I Boekhoff1, J Strotmann, K Raming

  • 1Institute of Zoophysiology, University Stuttgart-Hohenheim, F.R.G.

Cellular Signalling
|January 1, 1990
PubMed
Summary

Insect antennae detect odors and pheromones via a signaling pathway involving phospholipase C. This enzyme releases inositol trisphosphate, crucial for olfactory and pheromonal perception in locusts and cockroaches.

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Area of Science:

  • Insect olfaction
  • Signal transduction in invertebrates
  • Biochemistry of sensory systems

Background:

  • Insect antennae possess sophisticated chemosensory capabilities.
  • Phosphatidylinositol bisphosphate hydrolysis is a key step in cellular signaling pathways.

Purpose of the Study:

  • To investigate the role of phospholipase C in insect olfaction.
  • To identify the signaling molecules involved in odorant and pheromone detection in locusts and cockroaches.

Main Methods:

  • Incubation of insect antennal preparations with tritiated phosphatidylinositol bisphosphate.
  • Assay of phospholipase C activity in soluble and membrane fractions.
  • Measurement of inositol trisphosphate levels following stimulation with odorants and pheromones in a GTP-dependent manner.

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Main Results:

  • Hydrolysis of phosphatidylinositol bisphosphate released inositol trisphosphate in locust and cockroach antennae.
  • Phospholipase C activity was found in both soluble and membrane fractions.
  • Odorants and pheromones stimulated lipid hydrolysis at low calcium concentrations, dependent on GTP.
  • Inositol trisphosphate levels increased in antennal preparations upon odorant stimulation.

Conclusions:

  • Phospholipase C plays a significant role in insect chemosensation.
  • Odorant and pheromone detection involves a GTP-dependent signaling cascade leading to inositol trisphosphate production.
  • This pathway is conserved in both locusts and cockroaches, highlighting its importance in insect sensory biology.