Intrinsic and synaptic long-term depression of NTS relay of nociceptin- and capsaicin-sensitive cardiopulmonary afferents hyperactivity

Pflugers Arch. 2009 Mar;457(5):1147-59. doi: 10.1007/s00424-008-0571-9. Epub 2008 Aug 14.

Abstract

The nucleus tractus solitarius (NTS) in the caudal medulla is a gateway for a variety of cardiopulmonary afferents important for homeostatic regulation and defense against airway and cardiovascular insults and is a key central target potentially mediating the response habituation to these inputs. Here, whole-cell and field population action potential recordings and infrared imaging in rat brainstem slices in vitro revealed a compartmental pain-pathway-like organization of capsaicin-facilitated vs. nocistatin-facilitated/nociceptin-suppressed neuronal clusters in an NTS region, which receives cardiopulmonary A- and C-fiber afferents with differing capsaicin sensitivities. All capsaicin-sensitive neurons and a fraction of nociceptin-sensitive neurons expressed N-methyl-D: -aspartate (NMDA) receptor-dependent synaptic long-term depression (LTD) following afferent stimulation. All neurons also expressed activity-dependent decrease of excitability (intrinsic LTD), which converted to NMDA receptor-dependent intrinsic long-term potentiation after GABA(A) receptor blockade. Thus, distinct intrinsic and synaptic LTD mechanisms in the NTS specific to the relay of A- or C-fiber afferents may underlie the response habituation to persistent afferents hyperactivity that are associated with varying physiologic challenges and cardiopulmonary derangements-including hypertension, chronic cough, asthmatic bronchoconstriction, sustained elevated lung volume in chronic obstructive pulmonary disease or in continuous positive-airway-pressure therapy for sleep apnea, metabolic acidosis, and prolonged exposure to hypoxia at high altitude.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Action Potentials / drug effects
  • Action Potentials / physiology
  • Animals
  • Brain Stem / drug effects
  • Brain Stem / physiology
  • Capsaicin / pharmacology*
  • Excitatory Postsynaptic Potentials / physiology
  • Long-Term Potentiation
  • Long-Term Synaptic Depression / physiology*
  • Nerve Fibers / drug effects
  • Nerve Fibers / physiology*
  • Neurons, Afferent / drug effects
  • Neurons, Afferent / physiology*
  • Nociceptin
  • Opioid Peptides / pharmacology
  • Protein Precursors / pharmacology
  • Rats
  • Receptors, N-Methyl-D-Aspartate / metabolism
  • Receptors, Opioid
  • Solitary Nucleus / physiology*
  • Synaptic Transmission / drug effects
  • Synaptic Transmission / physiology
  • TRPV Cation Channels / drug effects
  • TRPV Cation Channels / physiology

Substances

  • Opioid Peptides
  • Protein Precursors
  • Receptors, N-Methyl-D-Aspartate
  • Receptors, Opioid
  • TRPV Cation Channels
  • Trpv1 protein, rat
  • nocistatin
  • prepronociceptin
  • Capsaicin