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Hedley KE, Cuskelly A, Callister RJ, Horvat JC, Hodgson DM, Tadros MA. The medulla oblongata shows a sex-specific inflammatory response to systemic neonatal lipopolysaccharide. J Neuroimmunol 2024; 389:578316. [PMID: 38394966 DOI: 10.1016/j.jneuroim.2024.578316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 02/12/2024] [Accepted: 02/14/2024] [Indexed: 02/25/2024]
Abstract
Early life inflammation has been linked to long-term modulation of behavioural outcomes due to the central nervous system, but it is now becoming apparent it is also linked to dysfunction of visceral physiology. The medulla oblongata contains a number of nuclei critical for homeostasis, therefore we utilised the well-established model of neonatal lipopolysaccharide (LPS) exposure to examine the immediate and long-term impacts of systemic inflammation on the medulla oblongata. Wistar rats were injected with LPS or saline on postnatal days 3 and 5, with tissues collected on postnatal days 7 or 90 in order to assess expression of inflammatory mediators and microglial morphology in autonomic regions of the medulla oblongata. We observed a distinct sex-specific response of all measured inflammatory mediators at both ages, as well as significant neonatal sex differences in inflammatory mediators within saline groups. At both ages, microglial morphology had significant changes in branch length and soma size in a sex-specific manner in response to LPS exposure. This data not only highlights the strong sex-specific response of neonates to LPS administration, but also the significant life-long impact on the medulla oblongata and the potential altered control of visceral organs.
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Affiliation(s)
- Kateleen E Hedley
- School of Biomedical Sciences & Pharmacy, University of Newcastle, NSW, Australia; Hunter Medical Research Institute, New Lambton Heights, NSW, Australia
| | - Annalisa Cuskelly
- Hunter Medical Research Institute, New Lambton Heights, NSW, Australia; School of Psychological Sciences, University of Newcastle, NSW, Australia; School of Education, University of Newcastle, NSW, Australia
| | - Robert J Callister
- School of Biomedical Sciences & Pharmacy, University of Newcastle, NSW, Australia; Hunter Medical Research Institute, New Lambton Heights, NSW, Australia
| | - Jay C Horvat
- School of Biomedical Sciences & Pharmacy, University of Newcastle, NSW, Australia; Hunter Medical Research Institute, New Lambton Heights, NSW, Australia
| | - Deborah M Hodgson
- Hunter Medical Research Institute, New Lambton Heights, NSW, Australia; School of Psychological Sciences, University of Newcastle, NSW, Australia
| | - Melissa A Tadros
- School of Biomedical Sciences & Pharmacy, University of Newcastle, NSW, Australia; Hunter Medical Research Institute, New Lambton Heights, NSW, Australia.
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2
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Wilson CG, Altamirano AE, Hillman T, Tan JB. Data analytics in a clinical setting: Applications to understanding breathing patterns and their relevance to neonatal disease. Semin Fetal Neonatal Med 2022; 27:101399. [PMID: 36396542 DOI: 10.1016/j.siny.2022.101399] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
In this review, we focus on the use of contemporary linear and non-linear data analytics as well as machine learning/artificial intelligence algorithms to inform treatment of pediatric patients. We specifically focus on methods used to quantify changes in breathing that can lead to increased risk for apnea of prematurity, retinopathy of prematurity (ROP), necrotizing enterocolitis (NEC) and provide a list of potentially useful algorithms that comprise a suite of software tools to enhance prediction of outcome. Next, we provide a brief overview of machine learning/artificial intelligence methods and applications within the sphere of perinatal care. Finally, we provide an overview of the infrastructure needed to use these tools in a clinical setting for real-time data acquisition, data synchrony, data storage and access, and bedside data visualization to assist in clinical decision making and support the medical informatics mission. Our goal is to provide an overview and inspire other investigators to adopt these tools for their own research and optimization of perinatal patient care.
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Affiliation(s)
- Christopher G Wilson
- Lawrence D. Longo, MD Center for Perinatal Biology, Loma Linda University, School of Medicine, Loma Linda, CA, 92350, USA; Department of Pediatrics, Loma Linda University, School of Medicine, Loma Linda, CA, 92350, USA.
| | - A Erika Altamirano
- Lawrence D. Longo, MD Center for Perinatal Biology, Loma Linda University, School of Medicine, Loma Linda, CA, 92350, USA.
| | - Tyler Hillman
- Lawrence D. Longo, MD Center for Perinatal Biology, Loma Linda University, School of Medicine, Loma Linda, CA, 92350, USA.
| | - John B Tan
- Department of Pediatrics, Loma Linda University, School of Medicine, Loma Linda, CA, 92350, USA; Huckleberry Care, Irvine, CA, 92618, USA.
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3
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Hedley KE, Callister RJ, Callister R, Horvat JC, Tadros MA. Alterations in brainstem respiratory centers following peripheral inflammation: A systematic review. J Neuroimmunol 2022; 369:577903. [DOI: 10.1016/j.jneuroim.2022.577903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 05/02/2022] [Accepted: 05/29/2022] [Indexed: 11/29/2022]
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4
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Lithopoulos MA, Strueby L, O'Reilly M, Zhong S, Möbius MA, Eaton F, Fung M, Hurskainen M, Cyr-Depauw C, Suen C, Xu L, Collins JJP, Vadivel A, Stewart DJ, Burger D, Thébaud B. Pulmonary and Neurologic Effects of Mesenchymal Stromal Cell Extracellular Vesicles in a Multifactorial Lung Injury Model. Am J Respir Crit Care Med 2022; 205:1186-1201. [PMID: 35286238 DOI: 10.1164/rccm.202012-4520oc] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
RATIONALE Bronchopulmonary dysplasia, a chronic respiratory condition originating from preterm birth, is associated with abnormal neurodevelopment. Currently, there is an absence of effective therapies for bronchopulmonary dysplasia and its associated brain injury. In preclinical trials mesenchymal stromal cell therapies demonstrate promise as a therapeutic for bronchopulmonary dysplasia. OBJECTIVES To investigate whether a multifactorial neonatal mouse model of lung injury perturbs neural progenitor cell function and to assess the ability of human umbilical cord-derived mesenchymal stromal cell extracellular vesicles to mitigate pulmonary and neurologic injury. METHODS Mice at postnatal day 7/8 were injected intraperitoneally with lipopolysaccharide and ventilated with 40% oxygen at postnatal day 9/10 for 8 hours. Treated animals received umbilical cord-mesenchymal stromal cell-derived extracellular vesicles intratracheally preceding ventilation. Lung morphology, vascularity, and inflammation were quantified. Neural progenitor cells were isolated from the subventricular zone/hippocampus and assessed for self-renewal, in vitro differentiation ability, and transcriptional profiles. MEASUREMENTS AND MAIN RESULTS The multifactorial lung injury model produced alveolar and vascular rarefaction mimicking bronchopulmonary dysplasia. Neural progenitor cells from lung injury mice showed reduced neurosphere and oligodendrocyte formation, as well as inflammatory transcriptional signatures. Mice treated with mesenchymal stromal cell extracellular vesicles showed significant improvement in lung architecture, vessel formation, and inflammatory modulation. Additionally, we observed significantly increased in vitro neurosphere formation and altered neural progenitor cell transcriptional signatures. CONCLUSIONS Our multifactorial lung injury model impairs neural progenitor cell function. Observed pulmonary and neurologic alterations are mitigated by intratracheal treatment with mesenchymal stromal cell-derived extracellular vesicles.
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Affiliation(s)
- Marissa A Lithopoulos
- Ottawa Hospital Research Institute, 10055, Regenerative Medicine Program, Ottawa, Ontario, Canada.,University of Ottawa, 6363, Department of Cellular and Molecular Medicine, Ottawa, Ontario, Canada
| | - Lannae Strueby
- University of Saskatchewan, 7235, Department of Pediatrics, Saskatoon, Saskatchewan, Canada
| | - Megan O'Reilly
- University of Alberta, 3158, Department of Pediatrics, Edmonton, Alberta, Canada
| | - Shumei Zhong
- Ottawa Hospital Research Institute, 10055, Regenerative Medicine Program, Ottawa, Ontario, Canada
| | - Marius A Möbius
- Universitätsklinikum Carl Gustav Carus, 39063, Department of Neonatalogy and Pediatric Critical Care Medicine, Dresden, Germany
| | - Farah Eaton
- University of Alberta, 3158, Faculty of Pharmacy and Pharmaceutical Sciences, Edmonton, Alberta, Canada
| | - Moses Fung
- University of Alberta, 3158, Department of Pediatrics, Edmonton, Alberta, Canada
| | - Maria Hurskainen
- Helsinki University Central Hospital, 159841, Department of Pediatric Cardiology, Helsinki, Finland.,University of Helsinki, 3835, Pediatric Research Center, Helsinki, Finland
| | - Chanèle Cyr-Depauw
- Ottawa Hospital Research Institute, 10055, Regenerative Medicine Program, Ottawa, Ontario, Canada.,University of Ottawa, 6363, Department of Cellular and Molecular Medicine, Ottawa, Ontario, Canada
| | - Colin Suen
- Ottawa Hospital Research Institute, 10055, Regenerative Medicine Program, Ottawa, Canada.,University of Ottawa, 6363, Department of Cellular and Molecular Medicine, Ottawa, Ontario, Canada
| | - Liqun Xu
- Ottawa Hospital Research Institute, 10055, Regenerative Medicine Program, Ottawa, Ontario, Canada
| | - Jennifer J P Collins
- Ottawa Hospital Research Institute, 10055, Regenerative Medicine Program, Ottawa, Ontario, Canada.,University of Ottawa, 6363, Department of Cellular and Molecular Medicine, Ottawa, Ontario, Canada
| | - Arul Vadivel
- Ottawa Hospital Research Institute, 10055, Regenerative Medicine Program, Ottawa, Ontario, Canada
| | - Duncan J Stewart
- Ottawa Hospital Research Institute, 10055, Regenerative Medicine Program, Ottawa, Ontario, Canada.,University of Ottawa, 6363, Department of Cellular and Molecular Medicine, Ottawa, Ontario, Canada
| | - Dylan Burger
- University of Ottawa, 6363, Department of Cellular and Molecular Medicine, Ottawa, Ontario, Canada.,Ottawa Hospital Research Institute, 10055, Kidney Research Centre, Chronic Disease Program, Ottawa, Ontario, Canada
| | - Bernard Thébaud
- Ottawa Hospital Research Institute, 10055, Regenerative Medicine Program, Ottawa, Ontario, Canada.,University of Ottawa, 6363, Department of Cellular and Molecular Medicine, Ottawa, Ontario, Canada.,Children's Hospital of Eastern Ontario Research Institute, 274065, Ottawa, Ontario, Canada;
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5
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Lorea-Hernández JJ, Camacho-Hernández NP, Peña-Ortega F. Interleukin 1-beta but not the interleukin-1 receptor antagonist modulates inspiratory rhythm generation in vitro. Neurosci Lett 2020; 734:134934. [PMID: 32259558 DOI: 10.1016/j.neulet.2020.134934] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 03/24/2020] [Accepted: 03/25/2020] [Indexed: 10/24/2022]
Abstract
Interleukin 1-beta (IL-1β) is a cytokine that modulates breathing when applied systemically or directly into the brain. IL-1β is expressed, along with its receptors, in IL-1β-sensitive respiratory-related circuits, which likely include the inspiratory rhythm generator (the preBötzinger complex, preBötC). Thus, considering that IL-1β might directly modulate preBötC function, we tested whether IL-1β and its endogenous antagonist IL1Ra modulate inspiratory rhythm generation in the brainstem slice preparation containing the preBötC. We found that IL-1β reduces, in a concentration-dependent manner, the amplitude of the fictive inspiratory rhythm generated by the preBötC, which is prevented by IL1Ra. Only a negligible effect on the rhythm frequency was observed at one of the concentrations tested (10 ng/mL). In sum, these findings indicate that IL-1β modulates respiratory rhythm generation. In contrast, IL1Ra did not produce a major effect but slightly increased burst amplitude regularity of the fictive respiratory rhythm. Our findings show that IL-1β modulates breathing by directly modulating the inspiratory rhythm generation. This modulation could contribute to the respiratory response to inflammation in health and disease.
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Affiliation(s)
- Jonathan Julio Lorea-Hernández
- Departamento de Neurobiología del Desarrollo y Neurofisiología, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Querétaro, Qro, 76230, México
| | - Neira Polet Camacho-Hernández
- Departamento de Neurobiología del Desarrollo y Neurofisiología, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Querétaro, Qro, 76230, México
| | - Fernando Peña-Ortega
- Departamento de Neurobiología del Desarrollo y Neurofisiología, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Querétaro, Qro, 76230, México.
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6
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Gauda EB, McLemore GL. Premature birth, homeostatic plasticity and respiratory consequences of inflammation. Respir Physiol Neurobiol 2019; 274:103337. [PMID: 31733340 DOI: 10.1016/j.resp.2019.103337] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 10/11/2019] [Accepted: 11/10/2019] [Indexed: 12/23/2022]
Abstract
Infants who are born premature can have persistent apnea beyond term gestation, reemergence of apnea associated with inflammation during infancy, increased risk of sudden unexplained death, and sleep disorder breathing during infancy and childhood. The autonomic nervous system, particularly the central neural networks that control breathing and peripheral and central chemoreceptors and mechanoreceptors that modulate the activity of the central respiratory network, are rapidly developing during the last trimester (22-37 weeks gestation) of fetal life. With advances in neonatology, in well-resourced, developed countries, infants born as young as 23 weeks gestation can survive. Thus, a substantial part of maturation of central and peripheral systems that control breathing occurs ex-utero in infants born at the limit of viability. The balance of excitatory and inhibitory influences dictates the ultimate output from the central respiratory network. We propose in this review that simply being born early in the last trimester can trigger homeostatic plasticity within the respiratory network tipping the balance toward inhibition that persists in infancy. We discuss the intersection of premature birth, homeostatic plasticity and biological mechanisms leading to respiratory depression during inflammation in former premature infants.
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Affiliation(s)
- Estelle B Gauda
- The Hospital for Sick Children, Division of Neonatology, Department of Pediatrics, University of Toronto, Toronto, Ontario, M5G 1X8, Canada.
| | - Gabrielle L McLemore
- Department of Biology, School of Computer, Mathematics and Natural Sciences (SCMNS), Morgan State University, Baltimore, MD, 21251, United States
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7
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Morrison NR, Johnson SM, Hocker AD, Kimyon RS, Watters JJ, Huxtable AG. Time and dose-dependent impairment of neonatal respiratory motor activity after systemic inflammation. Respir Physiol Neurobiol 2019; 272:103314. [PMID: 31614211 DOI: 10.1016/j.resp.2019.103314] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 09/07/2019] [Accepted: 10/02/2019] [Indexed: 02/06/2023]
Abstract
Neonatal respiratory impairment during infection is common, yet its effects on respiratory neural circuitry are not fully understood. We hypothesized that the timing and severity of systemic inflammation is positively correlated with impairment in neonatal respiratory activity. To test this, we evaluated time- and dose-dependent impairment of in vitro fictive respiratory activity. Systemic inflammation (induced by lipopolysaccharide, LPS, 5 mg/kg, i.p.) impaired burst amplitude during the early (1 h) inflammatory response. The greatest impairment in respiratory activity (decreased amplitude, frequency, and increased rhythm disturbances) occurred during the peak (3 h) inflammatory response in brainstem-spinal cord preparations. Surprisingly, isolated medullary respiratory circuitry within rhythmic slices showed decreased baseline frequency and delayed onset of rhythm only after higher systemic inflammation (LPS 10 mg/kg) early in the inflammatory response (1 h), with no impairments at the peak inflammatory response (3 h). Thus, different components of neonatal respiratory circuitry have differential temporal and dose sensitivities to systemic inflammation, creating multiple windows of vulnerability for neonates after systemic inflammation.
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Affiliation(s)
- Nina R Morrison
- Department of Human Physiology, University of Oregon, Eugene, OR, 97403, United States
| | - Stephen M Johnson
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, 53706, United States
| | - Austin D Hocker
- Department of Human Physiology, University of Oregon, Eugene, OR, 97403, United States
| | - Rebecca S Kimyon
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, 53706, United States
| | - Jyoti J Watters
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, WI, 53706, United States
| | - Adrianne G Huxtable
- Department of Human Physiology, University of Oregon, Eugene, OR, 97403, United States.
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Hocker AD, Beyeler SA, Gardner AN, Johnson SM, Watters JJ, Huxtable AG. One bout of neonatal inflammation impairs adult respiratory motor plasticity in male and female rats. eLife 2019; 8:45399. [PMID: 30900989 PMCID: PMC6464604 DOI: 10.7554/elife.45399] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 03/21/2019] [Indexed: 11/13/2022] Open
Abstract
Neonatal inflammation is common and has lasting consequences for adult health. We investigated the lasting effects of a single bout of neonatal inflammation on adult respiratory control in the form of respiratory motor plasticity induced by acute intermittent hypoxia, which likely compensates and stabilizes breathing during injury or disease and has significant therapeutic potential. Lipopolysaccharide-induced inflammation at postnatal day four induced lasting impairments in two distinct pathways to adult respiratory plasticity in male and female rats. Despite a lack of adult pro-inflammatory gene expression or alterations in glial morphology, one mechanistic pathway to plasticity was restored by acute, adult anti-inflammatory treatment, suggesting ongoing inflammatory signaling after neonatal inflammation. An alternative pathway to plasticity was not restored by anti-inflammatory treatment, but was evoked by exogenous adenosine receptor agonism, suggesting upstream impairment, likely astrocytic-dependent. Thus, the respiratory control network is vulnerable to early-life inflammation, limiting respiratory compensation to adult disease or injury.
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Affiliation(s)
- Austin D Hocker
- Department of Human Physiology, University of Oregon, Eugene, United States
| | - Sarah A Beyeler
- Department of Human Physiology, University of Oregon, Eugene, United States
| | - Alyssa N Gardner
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, United States
| | - Stephen M Johnson
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, United States
| | - Jyoti J Watters
- Department of Comparative Biosciences, University of Wisconsin-Madison, Madison, United States
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9
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Peña-Ortega F. Clinical and experimental aspects of breathing modulation by inflammation. Auton Neurosci 2018; 216:72-86. [PMID: 30503161 DOI: 10.1016/j.autneu.2018.11.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 11/06/2018] [Accepted: 11/07/2018] [Indexed: 12/19/2022]
Abstract
Neuroinflammation is produced by local or systemic alterations and mediated mainly by glia, affecting the activity of various neural circuits including those involved in breathing rhythm generation and control. Several pathological conditions, such as sudden infant death syndrome, obstructive sleep apnea and asthma exert an inflammatory influence on breathing-related circuits. Consequently breathing (both resting and ventilatory responses to physiological challenges), is affected; e.g., responses to hypoxia and hypercapnia are compromised. Moreover, inflammation can induce long-lasting changes in breathing and affect adaptive plasticity; e.g., hypoxic acclimatization or long-term facilitation. Mediators of the influences of inflammation on breathing are most likely proinflammatory molecules such as cytokines and prostaglandins. The focus of this review is to summarize the available information concerning the modulation of the breathing function by inflammation and the cellular and molecular aspects of this process. I will consider: 1) some clinical and experimental conditions in which inflammation influences breathing; 2) the variety of experimental approaches used to understand this inflammatory modulation; 3) the likely cellular and molecular mechanisms.
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Affiliation(s)
- Fernando Peña-Ortega
- Departamento de Neurobiología del Desarrollo y Neurofisiología, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Querétaro, QRO 76230, México.
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10
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Ramirez JM, Severs LJ, Ramirez SC, Agosto‐Marlin IM. Advances in cellular and integrative control of oxygen homeostasis within the central nervous system. J Physiol 2018; 596:3043-3065. [PMID: 29742297 PMCID: PMC6068258 DOI: 10.1113/jp275890] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2018] [Accepted: 04/04/2018] [Indexed: 12/31/2022] Open
Abstract
Mammals must continuously regulate the levels of O2 and CO2 , which is particularly important for the brain. Failure to maintain adequate O2 /CO2 homeostasis has been associated with numerous disorders including sleep apnoea, Rett syndrome and sudden infant death syndrome. But, O2 /CO2 homeostasis poses major regulatory challenges, even in the healthy brain. Neuronal activities change in a differentiated, spatially and temporally complex manner, which is reflected in equally complex changes in O2 demand. This raises important questions: is oxygen sensing an emergent property, locally generated within all active neuronal networks, and/or the property of specialized O2 -sensitive CNS regions? Increasing evidence suggests that the regulation of the brain's redox state involves properties that are intrinsic to many networks, but that specialized regions in the brainstem orchestrate the integrated control of respiratory and cardiovascular functions. Although the levels of O2 in arterial blood and the CNS are very different, neuro-glial interactions and purinergic signalling are critical for both peripheral and CNS chemosensation. Indeed, the specificity of neuroglial interactions seems to determine the differential responses to O2 , CO2 and the changes in pH.
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Affiliation(s)
- Jan Marino Ramirez
- Center for Integrative Brain ResearchSeattle Children's Research InstituteDepartment of Neurological SurgeryUniversity of Washington School of MedicineSeattleWAUSA
- Department of Physiology and BiophysicsUniversity of WashingtonSeattleWAUSA
| | - Liza J. Severs
- Department of Physiology and BiophysicsUniversity of WashingtonSeattleWAUSA
| | - Sanja C. Ramirez
- Center for Integrative Brain ResearchSeattle Children's Research InstituteDepartment of Neurological SurgeryUniversity of Washington School of MedicineSeattleWAUSA
| | - Ibis M. Agosto‐Marlin
- Center for Integrative Brain ResearchSeattle Children's Research InstituteDepartment of Neurological SurgeryUniversity of Washington School of MedicineSeattleWAUSA
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11
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Vagus nerve stimulation in pregnant rats and effects on inflammatory markers in the brainstem of neonates. Pediatr Res 2018; 83:514-519. [PMID: 29053705 PMCID: PMC5866172 DOI: 10.1038/pr.2017.265] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 09/25/2017] [Indexed: 01/29/2023]
Abstract
BackgroundVagus nerve stimulation (VNS) is an Food and Drug Administration-approved method delivering electrical impulses for treatment of depression and epilepsy in adults. The vagus nerve innervates the majority of visceral organs and cervix, but potential impacts of VNS on the progress of pregnancy and the fetus are not well studied.MethodsWe tested the hypothesis that VNS in pregnant dams does not induce inflammatory changes in the cardio-respiratory control regions of the pups' brainstem, potentially impacting the morbidity and mortality of offspring. Pregnant dams were implanted with stimulators providing intermittent low or high frequency electrical stimulation of the sub-diaphragmatic esophageal segment of the vagus nerve for 6-7 days until delivery. After birth, we collected pup brainstems that included cardio-respiratory control regions and counted the cells labeled for pro-inflammatory cytokines (interleukin (IL)-1β, IL-6, tumor necrosis factor-α) and high mobility group box 1.ResultsNeither pup viability nor number of cells labeled for pro-inflammatory cytokines in nucleus tractus solitarii or hypoglossal motor nucleus was impaired by VNS. We provide evidence suggesting that chronic VNS of pregnant mothers does not impede the progress or outcome of pregnancy.ConclusionVNS does not cause preterm birth, affect well-being of progeny, or impact central inflammatory processes that are critical for normal cardiovascular and respiratory function in newborns.
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12
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Ribeiro A, Mayer C, Wilson C, Martin R, MacFarlane P. Intratracheal LPS administration attenuates the acute hypoxic ventilatory response: Role of brainstem IL-1β receptors. Respir Physiol Neurobiol 2017; 242:45-51. [DOI: 10.1016/j.resp.2017.03.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 03/08/2017] [Accepted: 03/09/2017] [Indexed: 01/01/2023]
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13
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Rourke KS, Mayer CA, MacFarlane PM. A critical postnatal period of heightened vulnerability to lipopolysaccharide. Respir Physiol Neurobiol 2016; 232:26-34. [DOI: 10.1016/j.resp.2016.06.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Revised: 06/08/2016] [Accepted: 06/15/2016] [Indexed: 10/21/2022]
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14
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Xia L, Bartlett D, Leiter JC. Interleukin-1β and interleukin-6 enhance thermal prolongation of the LCR in decerebrate piglets. Respir Physiol Neurobiol 2016; 230:44-53. [PMID: 27181326 DOI: 10.1016/j.resp.2016.05.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 05/09/2016] [Accepted: 05/10/2016] [Indexed: 10/21/2022]
Abstract
Thermal stress and prior upper respiratory tract infection are risk factors for the Sudden Infant Death Syndrome. The adverse effects of prior infection are likely mediated by interleukin-1β (IL-1β). Therefore, we examined the single and combined effects of IL-1β and elevated body temperature on the duration of the Laryngeal Chemoreflex (LCR) in decerebrate neonatal piglets ranging in age from post-natal day (P) 3 to P7. We examined the effects of intraperitoneal (I.P.) injections of 0.3mg/Kg IL-1β with or without I.P. 10mg/Kg indomethacin pretreatment on the duration of the LCR, and in the same animals we also examined the duration of the LCR when body temperature was elevated approximately 2°C. We found that IL-1β significantly increased the duration of the LCR even when body temperature was held constant. There was a significant multiplicative effect when elevated body temperature was combined with IL-1β treatment: prolongation of the LCR was significantly greater than the sum of independent thermal and IL-1β-induced prolongations of the LCR. The effects of IL-1β, but not elevated body temperature, were blocked by pretreatment with indomethacin alone. We also tested the interaction between IL-6 given directly into the nucleus of the solitary tract (NTS) bilaterally in 100ngm microinjections of 50μL and pretreatment with indomethacin. Here again, there was a multiplicative effect of IL-6 treatment and elevated body temperature, which significantly prolonged the LCR. The effect of IL-6 on the LCR, but not elevated body temperature, was blocked by pretreatment with indomethacin. We conclude that cytokines interact with elevated body temperature, probably through direct thermal effects on TRPV1 receptors expressed pre-synaptically in the NTS and through cytokine-dependent sensitization of the TRPV1 receptor. This sensitization is likely initiated by cyclo-oxygenase-2 dependent synthesis of prostaglandin E2, which is stimulated by elevated levels of IL-1β or IL-6. Inflammatory sensitization of the LCR coupled with thermal prolongation of the LCR may increase the propensity for apnea and Sudden Infant Death Syndrome.
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Affiliation(s)
- Luxi Xia
- Department of Physiology & Neurobiology, Geisel School of Medicine at Dartmouth, Lebanon, NH, United States
| | - Donald Bartlett
- Department of Physiology & Neurobiology, Geisel School of Medicine at Dartmouth, Lebanon, NH, United States
| | - J C Leiter
- Department of Physiology & Neurobiology, Geisel School of Medicine at Dartmouth, Lebanon, NH, United States.
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15
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Johnson RL, Murray ST, Camacho DK, Wilson CG. Vagal nerve stimulation attenuates IL-6 and TNFα expression in respiratory regions of the developing rat brainstem. Respir Physiol Neurobiol 2016; 229:1-4. [PMID: 27049312 DOI: 10.1016/j.resp.2016.03.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 03/19/2016] [Accepted: 03/22/2016] [Indexed: 01/01/2023]
Abstract
Pre-term infants are at greater risk for systemic infection due to an underdeveloped immune system. Airway infection results in immune up-regulation of early pro-inflammatory cytokines interleukin-1β (IL-1β), interleukin-6 (IL-6) and tumor necrosis factor-α (TNFα) in the brainstem. Current treatment for neonatal infection involves antibiotic administration. We previously showed that LPS injected into the trachea of neonatal rats causes changes in breathing and in IL-1β expression in the nucleus tractus solitarii (NTS) and hypoglossal motor nucleus (XII). We hypothesize that lipopolysaccharide (LPS) instilled in the trachea also causes the up-regulation of IL-6 and TNFα in the brainstem autonomic control regions. To test this hypothesis we injected LPS into the trachea of rat pups (postnatal ages 10-12days) and then assessed changes in IL-6 and TNFα. Vagal nerve stimulation has been used in the treatment of many inflammatory disorders, including sepsis. Our experiments show that VNS attenuates the upregulation of IL-6 and TNFα caused by LPS and may be a viable alternative to antibiotics.
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Affiliation(s)
- Rhaya L Johnson
- Center for Perinatal Biology, Dept. of Basic Sciences, Loma Linda University, United States
| | - Samuel T Murray
- Center for Perinatal Biology, Dept. of Basic Sciences, Loma Linda University, United States
| | | | - Christopher G Wilson
- Center for Perinatal Biology, Dept. of Basic Sciences, Loma Linda University, United States; Department of Pediatrics, Loma Linda University, United States.
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Jobe AH, Tibboel D. Update in pediatric lung disease 2013. Am J Respir Crit Care Med 2014; 189:1031-6. [PMID: 24787065 DOI: 10.1164/rccm.201402-0230up] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Alan H Jobe
- 1 Department of Pediatrics, Cincinnati Children's Hospital, University of Cincinnati, Cincinnati, Ohio; and
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