Phenotypic traits of the hypothalamic PVN cells innervating airway-related vagal preganglionic neurons. 2006

Prabha Kc, and Abere Karibi-Ikiriko, and Cheryl F Rust, and Annapurni Jayam-Trouth, and Musa A Haxhiu
Specialized Neuroscience Research Program, Department of Physiology and Biophysics, Howard University College of Medicine, 520 "W" St., N.W., Washington, DC 20059, USA.

The paraventricular nucleus of the hypothalamus (PVN) integrates multiple inputs via projections from arginine vasopressin (AVP)- and oxytocin (OXT)-containing neurons to the brain stem and spinal cord as well as regulates respiratory and cardiovascular stress-related responses, which also affect airway function. In the present study, we used immunocytochemistry and the retrograde transneuronal tracer, Bartha strain of pseudorabies virus expressing green fluorescent protein (PRV-GFP), to localize AVP- and OXT-producing neurons that project to airway-related vagal preganglionic neurons (AVPNs) innervating intrapulmonary airways. PRV-GFP was microinjected into the upper right lung lobe, and after 4 days survival, hypothalamic tissue sections were processed for co-expression of PRV-GFP and AVP or PRV-GFP and OXT. In addition, in a separate group of five rats, Phaseolus vulgaris leucoagglutinin (PHAL), an anterograde tracer, was injected unilaterally into the PVN and cholera toxin beta subunit was microinjected into the tracheal wall. Analysis of five successfully infected animals showed that 14% of PRV-GFP labeled neurons express AVP traits and 18% of transneuronally-labeled neurons contain OXT. Furthermore, the identified AVPNs innervating extrathoracic trachea receive axon terminals of the PVN neurons. The results indicate that AVP- and OXT-producing PVN cells, via direct projections to the AVPNs, could modulate cholinergic outflow to the airways, as a part of overall changes in response to stress.

UI MeSH Term Description Entries
D007150 Immunohistochemistry Histochemical localization of immunoreactive substances using labeled antibodies as reagents. Immunocytochemistry,Immunogold Techniques,Immunogold-Silver Techniques,Immunohistocytochemistry,Immunolabeling Techniques,Immunogold Technics,Immunogold-Silver Technics,Immunolabeling Technics,Immunogold Silver Technics,Immunogold Silver Techniques,Immunogold Technic,Immunogold Technique,Immunogold-Silver Technic,Immunogold-Silver Technique,Immunolabeling Technic,Immunolabeling Technique,Technic, Immunogold,Technic, Immunogold-Silver,Technic, Immunolabeling,Technics, Immunogold,Technics, Immunogold-Silver,Technics, Immunolabeling,Technique, Immunogold,Technique, Immunogold-Silver,Technique, Immunolabeling,Techniques, Immunogold,Techniques, Immunogold-Silver,Techniques, Immunolabeling
D008168 Lung Either of the pair of organs occupying the cavity of the thorax that effect the aeration of the blood. Lungs
D008297 Male Males
D008845 Microinjections The injection of very small amounts of fluid, often with the aid of a microscope and microsyringes. Microinjection
D009435 Synaptic Transmission The communication from a NEURON to a target (neuron, muscle, or secretory cell) across a SYNAPSE. In chemical synaptic transmission, the presynaptic neuron releases a NEUROTRANSMITTER that diffuses across the synaptic cleft and binds to specific synaptic receptors, activating them. The activated receptors modulate specific ion channels and/or second-messenger systems in the postsynaptic cell. In electrical synaptic transmission, electrical signals are communicated as an ionic current flow across ELECTRICAL SYNAPSES. Neural Transmission,Neurotransmission,Transmission, Neural,Transmission, Synaptic
D009474 Neurons The basic cellular units of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the NERVOUS SYSTEM. Nerve Cells,Cell, Nerve,Cells, Nerve,Nerve Cell,Neuron
D010121 Oxytocin A nonapeptide hormone released from the neurohypophysis (PITUITARY GLAND, POSTERIOR). It differs from VASOPRESSIN by two amino acids at residues 3 and 8. Oxytocin acts on SMOOTH MUSCLE CELLS, such as causing UTERINE CONTRACTIONS and MILK EJECTION. Ocytocin,Pitocin,Syntocinon
D010286 Paraventricular Hypothalamic Nucleus Nucleus in the anterior part of the HYPOTHALAMUS. Hypothalamic Paraventricular Nucleus,Paraventricular Nucleus,Hypothalamic Nucleus, Paraventricular,Nucleus, Hypothalamic Paraventricular,Nucleus, Paraventricular,Nucleus, Paraventricular Hypothalamic,Paraventricular Nucleus, Hypothalamic
D010641 Phenotype The outward appearance of the individual. It is the product of interactions between genes, and between the GENOTYPE and the environment. Phenotypes
D010835 Phytohemagglutinins Mucoproteins isolated from the kidney bean (Phaseolus vulgaris); some of them are mitogenic to lymphocytes, others agglutinate all or certain types of erythrocytes or lymphocytes. They are used mainly in the study of immune mechanisms and in cell culture. Kidney Bean Lectin,Kidney Bean Lectins,Lectins, Kidney Bean,Phaseolus vulgaris Lectin,Phaseolus vulgaris Lectins,Phytohemagglutinin,Hemagglutinins, Plant,Lectin, Kidney Bean,Lectin, Phaseolus vulgaris,Lectins, Phaseolus vulgaris,Plant Hemagglutinins

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