Prenatal nicotine exposure alters glycinergic and GABAergic control of respiratory frequency in the neonatal rat brainstem-spinal cord preparation

Zili Luo, Nathaniel T. McMullen, Seres Costy-Bennett, Ralph F. Fregosi

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

Bath application of GABA-A receptor agonists in neonatal rat brainstem-spinal cord preparations (BSSC) reduces respiratory frequency, an effect that is enhanced by prenatal nicotine exposure. Here we test the hypothesis that these effects can be reproduced by microinjection of GABAergic and glycinergic agonists into the pre-Botzinger complex region (PBC). We recorded the activity of phrenic motor axons from the fourth cervical ventral root in 1-3 days old BSSC that were exposed to either nicotine (6 mg/(kg day)) or saline prenatally. Microinjection of glycine or muscimol into the PBC caused abrupt, reversible apnea in all experiments. Apnea duration with glycine averaged 50.3 ± 5 s in saline-exposed (N = 12), and 95.7 ± 9.9 s in nicotine-exposed (N = 12) neonates (P < 0.001). Apnea duration with muscimol averaged 51 ± 5.1 s in saline-exposed (N = 10), and 86 ± 10.6 s in nicotine-exposed (N = 12) neonates (P < 0.05). These data show that prenatal nicotine exposure alters development of central ventilatory control, and that neurons in the PBC region are involved.

Original languageEnglish (US)
Pages (from-to)226-234
Number of pages9
JournalRespiratory Physiology and Neurobiology
Volume157
Issue number2-3
DOIs
StatePublished - Aug 1 2007

Keywords

  • Brainstem
  • Development
  • Motor
  • Pre-Botzinger complex
  • Rat
  • Respiration
  • SIDS

ASJC Scopus subject areas

  • Neuroscience(all)
  • Physiology
  • Pulmonary and Respiratory Medicine

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