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dc.contributor.authorLucking, Eric F.
dc.contributor.authorO'Connor, Karen M.
dc.contributor.authorStrain, Conall R.
dc.contributor.authorFouhy, Fiona
dc.contributor.authorBastiaanssen, Thomaz F.S.
dc.contributor.authorBurns, David P.
dc.contributor.authorGolubeva, Anna V.
dc.contributor.authorSTANTON, CATHERINE
dc.contributor.authorClarke, Gerard
dc.contributor.authorCryan, John F.
dc.contributor.authorO'Halloran, Ken D.
dc.date.accessioned2020-02-19T12:39:29Z
dc.date.available2020-02-19T12:39:29Z
dc.date.issued2018-11-13
dc.identifier.citationLucking, E., O'Connor, K., Strain, C., Fouhy, F., Bastiaanssen, T., Burns, D., Golubeva, A., Stanton, C., Clarke, G., Cryan, J. and O'Halloran, K. Chronic intermittent hypoxia disrupts cardiorespiratory homeostasis and gut microbiota composition in adult male guinea-pigs. EBioMedicine, 2018, 38, 191-205. doi: https://doi.org/10.1016/j.ebiom.2018.11.010en_US
dc.identifier.issn2352-3964
dc.identifier.urihttp://hdl.handle.net/11019/1870
dc.descriptionpeer-revieweden_US
dc.description.abstractBackground: Carotid body (peripheral oxygen sensor) sensitisation is pivotal in the development of chronic intermittent hypoxia (CIH)-induced hypertension. We sought to determine if exposure to CIH, modelling human sleep apnoea, adversely affects cardiorespiratory control in guinea-pigs, a species with hypoxia-insensitive carotid bodies. We reasoned that CIH-induced disruption of gut microbiota would evoke cardiorespiratory morbidity. Methods: Adult male guinea-pigs were exposed to CIH (6.5% O2 at nadir, 6 cycles.hour−1) for 8 h.day−1 for 12 consecutive days. Findings: CIH-exposed animals established reduced faecal microbiota species richness, with increased relative abundance of Bacteroidetes and reduced relative abundance of Firmicutes bacteria. Urinary corticosterone and noradrenaline levels were unchanged in CIH-exposed animals, but brainstem noradrenaline concentrations were lower compared with sham. Baseline ventilation was equivalent in CIH-exposed and sham animals; however, respiratory timing variability, sigh frequency and ventilation during hypoxic breathing were all lower in CIH-exposed animals. Baseline arterial blood pressure was unaffected by exposure to CIH, but β-adrenoceptor-dependent tachycardia and blunted bradycardia during phenylephrine-induced pressor responses was evident compared with sham controls. Interpretation: Increased carotid body chemo-afferent signalling appears obligatory for the development of CIH-induced hypertension and elevated chemoreflex control of breathing commonly reported in mammals, with hypoxia-sensitive carotid bodies. However, we reveal that exposure to modest CIH alters gut microbiota richness and composition, brainstem neurochemistry, and autonomic control of heart rate, independent of carotid body sensitisation, suggesting modulation of breathing and autonomic homeostasis via the microbiota-gut-brainstem axis. The findings have relevance to human sleep-disordered breathing.en_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofseriesEBioMedicine;Vol. 38
dc.rightsAttribution-NonCommercial-ShareAlike 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/us/*
dc.subjectChronic intermittent hypoxiaen_US
dc.subjectHypertensionen_US
dc.subjectCardiorespiratory controlen_US
dc.subjectMicrobiomeen_US
dc.subjectGuinea-pigen_US
dc.titleChronic intermittent hypoxia disrupts cardiorespiratory homeostasis and gut microbiota composition in adult male guinea-pigsen_US
dc.typeArticleen_US
dc.identifier.doihttps://doi.org/10.1016/j.ebiom.2018.11.010
dc.contributor.sponsorUniversity College Cork, Irelanden_US
dc.source.volume38
dc.source.beginpage191-205
refterms.dateFOA2020-02-19T12:39:30Z


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