Immunohistochemical mapping of natriuretic peptide receptor-A in the brainstem of Macaca fascicularis

Essam Mohamed, A. H K Osman, T. Takada, R. Torii, I. Tooyama

Research output: Contribution to journalArticle

10 Citations (Scopus)


Natriuretic peptide receptor-A (NPR-A) mediates the biological effects of atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP), and is involved in maintaining cardiovascular homeostasis. In this immunohistochemical study we examined the distribution of NPR-A in the brainstem of the cynomolgus monkey. NPR-A immunoreactivity was localized to neurons in specific brainstem regions. NPR-A-immunoreactive perikarya were found in the red nucleus and the oculomotor nucleus in the midbrain, the parabrachial nucleus and the locus coeruleus in the pons, and the dorsal motor nucleus of the vagus, the hypoglossal nucleus, the cuneate nucleus, the gracile nucleus, the nucleus ambiguus, the lateral reticular nucleus, the reticular formation, and the inferior olivary nucleus in the medulla oblongata. Extensive networks of immunoreactive fibers were apparent in the red nucleus, the oculomotor nucleus, the principal sensory trigeminal nucleus, and the parabrachial nucleus. Double immunostaining revealed NPR-A immunoreactivity in cholinergic neurons of the parabrachial nucleus, the dorsal motor nucleus of vagus, the hypoglossal nucleus, and the nucleus ambiguus. However, there was no colocalization of NPR-A and tyrosine hydroxylase in the locus coeruleus. The wide anatomical distribution of NPR-A-immunoreactive structures suggests that natriuretic peptides, besides having a role in the central regulation of endocrine and cardiovascular homeostasis, may also mediate diverse physiological functions.

Original languageEnglish
Pages (from-to)1087-1096
Number of pages10
Issue number3
Publication statusPublished - 30 Mar 2007
Externally publishedYes



  • cynomolgus monkey
  • immunohistochemistry
  • medulla oblongata
  • midbrain
  • natriuretic peptide receptor-A
  • pons

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this