title: Differential activation of adrenal, renal, and lumbar sympathetic nerves following stimulation of the rostral ventrolateral medulla of the rat.
abstract: Under acute and chronic conditions, the sympathetic nervous system can be activated in a differential and even selective manner. Activation of the rostral ventrolateral medulla (RVLM) has been implicated in differential control of sympathetic outputs based on evidence primarily in the cat. Although several studies indicate that differential control of sympathetic outflow occurs in other species, only a few studies have addressed whether the RVLM is capable of producing varying patterns of sympathetic activation in the rat. Therefore, the purpose of the present study was to determine whether activation of the RVLM results in simultaneous and differential increases in preganglionic adrenal (pre-ASNA), renal (RSNA), and lumbar (LSNA) sympathetic nerve activities. In urethane-chloralose anesthetized rats, pre-ASNA, RSNA, and LSNA were recorded simultaneously in all animals. Microinjections of selected concentrations and volumes of glutamate increased pre-ASNA, RSNA, and LSNA concurrently and differentially. Pre-ASNA and RSNA (in most cases) exhibited greater increases compared with LSNA on a percentage basis. By varying the volume or location of the glutamate microinjections, we also identified individual examples of differential and selective activation of these nerves. Decreases in arterial pressure or bilateral blockade of RVLM GABA(A) receptors also revealed differential activation, with the latter having a 3- to 4-fold greater effect on sympathetic activity. Our data provide evidence that activation of the rat RVLM increases renal, lumbar, and preganglionic adrenal sympathetic nerve activities concurrently, differentially, and, in some cases, selectively.
authors.affiliation: Dept. of Physiology, Wayne State University School of Medicine, 540 E. Canfield, Detroit, MI 48201, USA. pmueller@med.wayne.edu
authors.forename: Patrick J
authors.initials: PJ
authors.lastname: Mueller
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Mischel
authors.forename: Tadeusz J
authors.initials: TJ
authors.lastname: Scislo
mesh_terms: D000200:Action Potentials; D000311:Adrenal Glands / Q000294:innervation*; D000704:Analysis of Variance; D000768:Anesthesia, General; D000818:Animals; D001339:Autonomic Fibers, Preganglionic / Q000187:drug effects / Q000502:physiology*; D001640:Bicuculline / Q000008:administration & dosage; D001794:Blood Pressure; D001808:Blood Vessels / Q000294:innervation; D004305:Dose-Response Relationship, Drug; D018690:Excitatory Amino Acid Agonists / Q000008:administration & dosage; D058787:GABA-A Receptor Antagonists / Q000008:administration & dosage; D018698:Glutamic Acid / Q000008:administration & dosage; D006614:Hindlimb; D007668:Kidney / Q000294:innervation*; D008160:Lumbosacral Plexus / Q000187:drug effects / Q000502:physiology*; D008297:Male; D008526:Medulla Oblongata / Q000187:drug effects / Q000502:physiology*; D008845:Microinjections; D018482:Muscle, Skeletal / Q000098:blood supply*; D009599:Nitroprusside / Q000008:administration & dosage; D051381:Rats; D017207:Rats, Sprague-Dawley; D013564:Sympathetic Nervous System / Q000187:drug effects / Q000502:physiology*; D013997:Time Factors; D014665:Vasodilator Agents / Q000008:administration & dosage
chemical_list: D018690:Excitatory Amino Acid Agonists; D058787:GABA-A Receptor Antagonists; D014665:Vasodilator Agents; D009599:Nitroprusside; D018698:Glutamic Acid; D001640:Bicuculline