Optical mapping of pontine chemosensitive regions of neonatal rat

Yoko Ito, Yoshitaka Oyamada, Yasumasa Okada, Haruhiko Hakuno, Ryoma Aoyama, Kazuhiro Yamaguchi

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12 Citations (Scopus)


We analyzed the neuronal response to hypercapnic acidosis, using an optical recording technique with a fluorescent voltage-sensitive dye (di-4-ANEPPS), in pontine slice preparations of neonatal rats, containing the locus coeruleus (LC), which has been electrophysiologically demonstrated to be chemosensitive. The dye-stained preparation was continuously superfused with artificial cerebrospinal fluid. Epifluorescence of the slice was detected using a high-sensitivity optical recording system. Changes in the intensity of fluorescence were serially analyzed while switching artificial cerebrospinal fluid from control to hypercapnic acidosis, or vice versa. The optical recording method revealed that the LC, as reported in previous studies, reversibly showed a depolarizing response to hypercapnic acidosis in 56% of the examined preparations. The A5 area (56%) also exhibited a reversible, depolarizing response to hypercapnic acidosis. The response was preserved under conditions in which chemical synaptic transmission was blocked by low Ca2+-high Mg2+ solution. These results suggest that the optical recording method is applicable to identification of potentially chemosensitive areas, which deserve further electrophysiological analysis, and that the A5 area could be chemosensitive.

Original languageEnglish
Pages (from-to)103-106
Number of pages4
JournalNeuroscience Letters
Issue number1
Publication statusPublished - 2004 Aug 5


  • A5 area
  • Chemosensitivity
  • Locus coeruleus
  • Optical recording
  • Pons

ASJC Scopus subject areas

  • General Neuroscience


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