Localization of NADPH diaphorase in neurons of the rostral ventral medulla: possible role of nitric oxide in central autonomic regulation and oxygen chemoreception. Academic Article uri icon

Overview

abstract

  • We studied whether neurons containing nitric oxide synthase (NOS) are localized to the rostral ventrolateral medulla (RVM) and, if so, whether they are distinct from the adrenergic neurons of the C1 group. NOS-containing neurons and/or C1 neurons were visualized using NADPH diaphorase histochemistry and phenylethanolamine N-methyltransferase (PNMT) immunohistochemistry, respectively. A column of NADPH diaphorase-positive neurons, extending 2 mm in the rostrocaudal plane, was observed lateral to the inferior olive and medial to the C1 neurons. Double labelling studies showed that NADPH diaphorase-positive neurons were not immunoreactive for PNMT, indicating that the two enzymes were localized in the different cells. Furthermore, only a small fraction of NADPH diaphorase neurons were retrogradely labelled after injections of fluorogold into the thoracic cord. We conclude that the RVM contains a well-defined group of neurons endowed with NOS that are distinct from the adrenergic neurons of the C1 group and have only limited monosynaptic projections to the spinal cord. Since the RVM is involved in the control of arterial pressure and in oxygen-conserving reflexes, the findings raise the possibility that nitric oxide participates in central autonomic regulation and oxygen chemoreception.

publication date

  • February 12, 1993

Research

keywords

  • Autonomic Nervous System
  • Chemoreceptor Cells
  • Medulla Oblongata
  • NADPH Dehydrogenase
  • Neurons
  • Nitric Oxide
  • Oxygen Consumption
  • Stilbamidines

Identity

Scopus Document Identifier

  • 0027405577

Digital Object Identifier (DOI)

  • 10.1016/0006-8993(93)91318-m

PubMed ID

  • 8453473

Additional Document Info

volume

  • 603

issue

  • 1