title: Development of neuropeptide Y and tyrosine hydroxylase immunoreactive innervation in postnatal rat heart.
abstract: Neuropeptide Y (NPY), immunoreactive (IR), and tyrosine hydroxylase (TH)-IR nerve fibers were scarce at birth in rat heart, but increased rapidly during the first 2 postnatal weeks, reaching approximately adult levels by the third week. The sequence of development was: interatrial septum and atrial wall, free ventricular wall starting from the epicardium, and finally the atrial appendages and interventricular septum. In ventricles and atrial appendages both fiber types developed similarly. In interatrial septum and atrial walls more NPY-IR than TH-IR fibers were evident, and NPY-IR, but not TH-IR, neurons were detected in intrinsic ganglia. Double-label immunohistochemistry provided further evidence that NPY is located in ventricular and atrial noradrenergic nerves, but is also located in nonnoradrenergic nerves in atria.
authors.affiliation: Division of Cell Biology and Biophysics, School of Biological Sciences, University of Missouri-Kansas City 64108.
authors.forename: C
authors.initials: C
authors.lastname: Nyquist-Battie
authors.forename: P K
authors.initials: PK
authors.lastname: Cochran
authors.forename: S A
authors.initials: SA
authors.lastname: Sands
authors.forename: B M
authors.initials: BM
authors.lastname: Chronwall
mesh_terms: D000375:Aging / Q000378:metabolism*; D000818:Animals; D000831:Animals, Newborn; D005260:Female; D005455:Fluorescent Antibody Technique; D006321:Heart / Q000254:growth & development / Q000294:innervation*; D007150:Immunohistochemistry; D008297:Male; D009206:Myocardium / Q000166:cytology; D009412:Nerve Fibers / Q000502:physiology* / Q000648:ultrastructure; D009478:Neuropeptide Y / Q000032:analysis / Q000378:metabolism*; D011247:Pregnancy; D051381:Rats; D017207:Rats, Sprague-Dawley; D013564:Sympathetic Nervous System / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism; D014446:Tyrosine 3-Monooxygenase / Q000032:analysis / Q000378:metabolism*
chemical_list: D009478:Neuropeptide Y; D014446:Tyrosine 3-Monooxygenase