Sensory processing of ambient CO2 information in the brain of the moth Manduca sexta

Pablo G. Guerenstein, Thomas A. Christensen, John G Hildebrand

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Insects use information about CO2 to perform vital tasks such as locating food sources. In certain moths, CO2 is involved in oviposition behavior. The labial palps of adult moths that feed as adults have a pit organ containing sensory receptor cells that project into the antennal lobes, the sites of primary processing of olfactory information in the brain. In the moth Manduca sexta and certain other species of Lepidoptera, these receptor cells in the labial-palp pit organ have been shown to be tuned to CO 2, and their axons project to a single, identified glomerulus in the antennal lobe, the labial-palp pit organ glomerulus. At present, however, nothing is known about the function of this glomerulus or how CO2 information is processed centrally. We used intracellular recording and staining to reveal projection (output) neurons in the antennal lobes that respond to CO2 and innervate the labial-palp pit organ glomerulus. Our results demonstrate that this glomerulus is the site of first-order processing of sensory information about ambient CO2. We found three functional types of CO2-responsive neurons (with their cell bodies in the antennal lobe or the protocerebrum) that provide output from the antennal lobe to higher centers in the brain. Some physiological characteristics of those neurons are described.

Original languageEnglish (US)
Pages (from-to)707-725
Number of pages19
JournalJournal of Comparative Physiology A
Volume190
Issue number9
DOIs
StatePublished - Sep 2004

Fingerprint

antennal lobe
Manduca
Moths
Manduca sexta
Lip
moth
moths
palps
brain
lips
Brain
Automatic Data Processing
Neurons
neurons
Oviposition
Lepidoptera
sensory receptors
Sensory Receptor Cells
Carbon Monoxide
oviposition

Keywords

  • Antennal lobe
  • Carbon dioxide
  • Labial palp
  • Olfaction
  • Pit organ

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Physiology
  • Physiology (medical)
  • Neuroscience(all)
  • Behavioral Neuroscience

Cite this

Sensory processing of ambient CO2 information in the brain of the moth Manduca sexta. / Guerenstein, Pablo G.; Christensen, Thomas A.; Hildebrand, John G.

In: Journal of Comparative Physiology A, Vol. 190, No. 9, 09.2004, p. 707-725.

Research output: Contribution to journalArticle

Guerenstein, Pablo G. ; Christensen, Thomas A. ; Hildebrand, John G. / Sensory processing of ambient CO2 information in the brain of the moth Manduca sexta. In: Journal of Comparative Physiology A. 2004 ; Vol. 190, No. 9. pp. 707-725.
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