Ontogeny of the O2-senstive pathway in medulla oblongata of postnatal rat

L. D. White, E. E. Lawson, D. E. Millhorn

Research output: Contribution to journalArticlepeer-review


Fos protein, the product of the immediate early gene c-fos as a metabolic marker to map the O2 chemosensory pathway activated by hypoxia in the adult rat (Erickson and Millhorn, Brain Res. 567: 11-24, 1991). The current study provides evidence that the O2 chemoreceptor pathway develops during the first postnatal month. Rats at postnatal ages (P) 3, 7, 10, 14, 21, adn 28 days were exposed for 3 h to 21% (control) or 10% (hypoxia) O2. Pups were transcardially fixed, brain stems were froze, sectioned, then reacted Fos primary antibody, a secondary antibody, avidin-biotin peroxidase, then Ni-DAB as chromogen. Cells showing Fos-like immunoreactivity (Fos0LI) under control and hypoxic conditions were counted in the nucleus tractus solitarii (NTS) and the ventrolateral medulla (VLM). In both areas there was initially a low basal level of Fos-LI, a peak at P10 and a decline to P28. At all ages there was a significant increase in the number of Fos-LI cells in pups exposed to hypopxia. The high basal level of Fos expression at P10 and the high induced level at P14 may correlate with periods of terminal differentiation and maximum synaptogenesis, respectively.

Original languageEnglish (US)
Pages (from-to)123-135
Number of pages13
JournalRespiration Physiology
Issue number2
StatePublished - Oct 1994
Externally publishedYes


  • Chemosensitivity
  • Contorl of breathgin
  • Development
  • Mammals
  • Medulla
  • O central pathway
  • O chemoreceptor pathway
  • O chemosensitivity
  • nucleus tractus solitarii
  • rat

ASJC Scopus subject areas

  • Physiology
  • Pulmonary and Respiratory Medicine


Dive into the research topics of 'Ontogeny of the O2-senstive pathway in medulla oblongata of postnatal rat'. Together they form a unique fingerprint.

Cite this