Brainstem catecholaminergic neurons modulate both respiratory and cardiovascular function.

Brainstem catecholaminergic neurons modulate both respiratory and cardiovascular function. Research Abstract Details 

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Brainstem catecholaminergic neurons modulate both respiratory and cardiovascular function. Abstract Text:

Aihua Li,Laura Emond,Eugene Nattie,Aihua Li,Laura Emond,Eugene Nattie,

Catecholamine neurons (CA) located in the brainstem project widely in the forebrain, hindbrain and spinal cord to many regions involved in the control of respiratory and cardiovascular function. For example, A6 noradrenergic neurons provide a tonic excitatory stimulus that maintains breathing frequency while A5 neurons provide an inhibitory influence on both cardiovascular and respiratory function to slow breathing frequency and heart rate. Mice with genetic defects that include CA neurons have abnormal respiration and blood pressure. For example, mice heterozygous for Phox2b with CA neuron defects have sleep-disordered breathing, and DBH knockout mice with absent CA cells centrally and peripherally have hypotension. Our hypothesis is that widespread brainstem CA neuron lesions in adult rats would significantly affect cardiorespiratory functions including breathing, chemoreception, blood pressure and heart rate. We produced the widespread brainstem CA neuron lesion by injecting anti-dopamine-beta-hydroxylase-saporin (DBH-SAP) via the 4th ventricle. The lesioned group had a 64-84% loss of A5, A6 and A7 tyrosine hydroxylase immunoreactive (ir) neurons along with 56-64% loss of C1 and C2 phenyl ethanolamine-N methyltransferase (PNMT)-ir neurons over 2-3 weeks. The significant respiratory changes included: (1) a decreased breathing frequency during air and 7% CO2 breathing in both wakefulness and non-REM (NREM) sleep; (2) a reduced ventilatory response to 7% CO2 in wakefulness (-28%) and in NREM sleep (-26%); and (3) increased variability of breathing in REM sleep but not in wakefulness or NREM sleep. Significant cardiovascular changes at two weeks included: (1) an increased MAP by 11.7mmHg in the room air resting condition; (2) an unaffected cardiovascular response to hypercapnia; and (3) a smaller decrease of MAP in response to hypoxia. Conclusions: Central CA neurons have a net excitatory effect on breathing and chemoreception but a net inhibitory effect on blood pressure.

Brainstem catecholaminergic neurons modulate both respiratory and cardiovascular function. Publishing Authors By Initials

A Li,L Emond,E Nattie,A Li,L Emond,E Nattie,

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Brainstem catecholaminergic neurons modulate both respiratory and cardiovascular function. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Advances in experimental medicine and biology

VOLUME: 605

Page Numbers: 371-6

Journal Abbreviation: Adv. Exp. Med. Biol.

ISSN: 0065-2598

DAY: 18

MONTH: 12

YEAR: 2008

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LANGUAGE: eng

NlmUniqueID: 121103

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Grant and Affiliation Information for Brainstem catecholaminergic neurons modulate both respiratory and cardiovascular function.

AFFILIATION: Department of Physiology, Dartmouth Medical School, Lebanon, NH, USA. Aihua.Li@dartmouth.edu

Country: United States

AGENCY: United States NHLBI

GRANT: R01 HL 28066

ACRONYM: HL

MEDLINETA: Adv Exp Med Biol

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