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Determining Ultrasonic Vocalization Preferences in Mice using a Two-choice Playback Test
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Published on: September 3, 2015

Encoding social signals in the mouse main olfactory bulb.

Da Yu Lin1, Shao-Zhong Zhang, Eric Block

  • 1HHMI and Department of Neurobiology, Box 3209, Duke University Medical Center, Durham, North Carolina 27710, USA. dayulin@neuro.duke.edu

Nature
|February 23, 2005
PubMed
Summary

Mice use urine volatile compounds for communication. Specific mitral cells in the main olfactory bulb detect single compounds, like (methylthio)methanethiol in male urine, which is key for female attraction.

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Area of Science:

  • Neuroscience
  • Olfactory System
  • Chemical Ecology

Background:

  • Mammalian urine contains complex volatile compounds crucial for social behaviors like reproduction and recognition.
  • The main olfactory bulb (MOB) processes these complex odorant mixtures, but the specific neural representations are not fully understood.

Purpose of the Study:

  • To investigate how individual mitral cells in the MOB represent volatile compounds found in mouse urine.
  • To identify specific odorant molecules and the corresponding neural pathways involved in olfactory processing.

Main Methods:

  • Electrophysiological recordings were performed on individual mitral cells in response to mouse urine volatile compounds.
  • Gas chromatography was used to fractionate urine volatiles and identify activating compounds.
  • Behavioral assays assessed the attractiveness of urine volatiles to female mice.

Main Results:

  • A subset of mitral cells responded robustly to urine volatiles in both sexes.
  • Mitral cells were activated by single volatile compounds, acting as selective feature detectors.
  • A specific cohort of mitral cells responded exclusively to male urine, activated by (methylthio)methanethiol.
  • (Methylthio)methanethiol, a novel semiochemical, significantly increased the attractiveness of male urine to females.

Conclusions:

  • Mitral cells function as selective feature detectors, representing complex natural odorants through individual neuron responses.
  • The identified semiochemical (methylthio)methanethiol plays a significant role in mediating olfactory attraction in mice.
  • Olfactory processing in the MOB appears to be largely independent of the presence of other odor components.