Linked Life Data

15890791

Source:http://linkedlifedata.com/resource/pubmed/id/15890791

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pubmed-article:15890791pubmed:abstractTextCalcium/calmodulin-dependent kinase II (CaMKII) is an ubiquitous second messenger that is highly expressed in neurons, where it has been implicated in some of the pathways regulating neuronal discharge as well as N-methyl-d-aspartate receptor-mediated synaptic plasticity. The full expression of the mammalian hypoxic ventilatory response (HVR) requires intact central relays within the nucleus of the solitary tract (NTS), and neural transmission of hypoxic afferent input is mediated by glutamatergic receptor activity, primarily through N-methyl-D-aspartate receptors. To examine the functional role of CaMKII in HVR, KN-93, a highly selective antagonist of CaMKII, was microinjected in the NTS via bilaterally placed osmotic pumps in freely behaving adult male Sprague-Dawley rats for 3 days. Vehicle-loaded osmotic pumps were surgically placed in control animals, and adequate placement of cannulas was ascertained for all animals. HVR was measured using whole body plethysmography during exposure to 10% O(2)-balance N(2) for 20 min. Compared with control rats, KN-93 administration elicited marked attenuations of peak HVR (pHVR) but did not modify normoxic minute ventilation. Differences in pHVR were primarily attributable to diminished respiratory frequency recruitments during pHVR without significant differences in tidal volume. These findings indicate that CaMKII activation in the NTS mediates respiratory frequency components of the ventilatory response to acute hypoxia; however, CaMKII activity does not appear to underlie components of normoxic ventilation.lld:pubmed
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pubmed-article:15890791pubmed:authorpubmed-author:ReevesStephen...lld:pubmed
pubmed-article:15890791pubmed:authorpubmed-author:GuoShang ZSZlld:pubmed
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pubmed-article:15890791pubmed:paginationR871-6lld:pubmed
pubmed-article:15890791pubmed:dateRevised2007-11-15lld:pubmed
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pubmed-article:15890791pubmed:articleTitleCalcium/calmodulin-dependent kinase II mediates critical components of the hypoxic ventilatory response within the nucleus of the solitary tract in adult rats.lld:pubmed
pubmed-article:15890791pubmed:affiliationKosair Children's Hospital Research Institute, University of Louisville, Suite 204, 570 South Preston Street, Louisville, KY 40202, USA.lld:pubmed
pubmed-article:15890791pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:15890791pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:15890791pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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