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Wang C, Jia X, Jin H, Meng Y, Ye W, Zhang N, Wang W, Kan H, Zhang J. Maternal exposure to fine particulate matter and brain-derived neurotrophic factor (BDNF) in the fetus: A prospective cohort study. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 257:114912. [PMID: 37075646 DOI: 10.1016/j.ecoenv.2023.114912] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 04/10/2023] [Accepted: 04/11/2023] [Indexed: 05/03/2023]
Abstract
Maternal exposure to ambient fine particulate matter (PM2.5) during pregnancy has been associated with impaired neurobehavioral development in children. However, the specific mechanism remains unclear. Brain derived neurotrophic factor (BDNF) is an important growth factor in the nervous system. We evaluated the associations of maternal PM2.5 exposures with fetal BDNF in the umbilical cord blood in a prospective cohort study. A total of 711 eligible mother-infant pairs from the Shanghai Birth Cohort were included in the current study. Daily maternal exposures to ambient PM2.5 were assessed with a gap-filling approach at 1 * 1 km2 resolution based on self-reported home addresses. The concentrations of BDNF in the cord blood were measured by ELISA. A linear regression model was applied to evaluate the association of maternal ambient PM2.5 exposure with fetal BDNF level at birth. The median concentration of BDNF was 13,403 pg/ml. Vaginal deliveries and female infants had higher BDNF levels than cesarean deliveries and male infants. One natural log (ln) unit increase in maternal PM2.5 exposure during the second trimester was significantly associated with - 0.20 (95% CI: -0.36, -0.05) ln-unit decrease in BDNF level in all births. These effects were stronger and more significant in vaginal deliveries and in male infants. Our study suggests that BDNF in the cord blood may serve as a potential biomarker in assessing the neurodevelopmental effects of maternal PM2.5 exposure.
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Affiliation(s)
- Cuiping Wang
- Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiaojun Jia
- Department of Obstetrics and Gynecology, Shanghai Putuo Maternity and Infant Hospital, 517 Tong Pu Road, Shanghai 200062, China
| | - Hong Jin
- Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yu Meng
- Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Weiping Ye
- Department of Obstetrics and Gynecology, Shanghai Putuo Maternity and Infant Hospital, 517 Tong Pu Road, Shanghai 200062, China
| | - Na Zhang
- Shanghai Jiao Tong University School of Public Health, Shanghai, China
| | - Weidong Wang
- Department of Biostatistics and Epidemiology, School of Public Health and Health Sciences, University of Massachusetts Amherst, Amherst, MA 01002, USA
| | - Haidong Kan
- School of Public Health, Shanghai Institute of Infectious Disease and Biosecurity, Key Lab of Public Health Safety of the Ministry of Education and Key Lab of Health Technology Assessment of the Ministry of Health, Fudan University, Shanghai 200032, China.
| | - Jun Zhang
- Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Jiao Tong University School of Public Health, Shanghai, China.
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Levison SW, Rocha-Ferreira E, Kim BH, Hagberg H, Fleiss B, Gressens P, Dobrowolski R. Mechanisms of Tertiary Neurodegeneration after Neonatal Hypoxic-Ischemic Brain Damage. PEDIATRIC MEDICINE (HONG KONG, CHINA) 2022; 5:28. [PMID: 37601279 PMCID: PMC10438849 DOI: 10.21037/pm-20-104] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/22/2023]
Abstract
Neonatal encephalopathy linked to hypoxia-ischemia (H-I) which is regarded as the most important neurological problem of the newborn, can lead to a spectrum of adverse neurodevelopmental outcomes such as cerebral palsy, epilepsy, hyperactivity, cognitive impairment and learning difficulties. There have been numerous reviews that have focused on the epidemiology, diagnosis and treatment of neonatal H-I; however, a topic that is less often considered is the extent to which the injury might worsen over time, which is the focus of this review. Similarly, there have been numerous reviews that have focused on mechanisms that contribute to the acute or subacute injury; however, there is a tertiary phase of recovery that can be defined by cellular and molecular changes that occur many weeks and months after brain injury and this topic has not been the focus of any review for over a decade. Therefore, in this article we review both the clinical and pre-clinical data that show that tertiary neurodegeneration is a significant contributor to the final outcome, especially after mild to moderate injuries. We discuss the contributing roles of apoptosis, necroptosis, autophagy, protein homeostasis, inflammation, microgliosis and astrogliosis. We also review the limited number of studies that have shown that significant neuroprotection and preservation of neurological function can be achieved administering drugs during the period of tertiary neurodegeneration. As the tertiary phase of neurodegeneration is a stage when interventions are eminently feasible, it is our hope that this review will stimulate a new focus on this stage of recovery towards the goal of producing new treatment options for neonatal hypoxic-ischemic encephalopathy.
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Affiliation(s)
- Steven W. Levison
- Department of Pharmacology, Physiology, and Neuroscience, Rutgers University, New Jersey Medical School, Cancer Center, 205 South Orange Avenue, Newark, NJ 07103, USA
| | - Eridan Rocha-Ferreira
- Centre of Perinatal Medicine & Health, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Brian H. Kim
- Department of Pharmacology, Physiology, and Neuroscience, Rutgers University, New Jersey Medical School, Cancer Center, 205 South Orange Avenue, Newark, NJ 07103, USA
| | - Henrik Hagberg
- Centre of Perinatal Medicine & Health, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Centre for the Developing Brain, Division of Imaging Sciences and Biomedical Engineering, King’s College London, King’s Health Partners, St. Thomas’ Hospital, London, SE1 7EH, UK
| | - Bobbi Fleiss
- Centre for the Developing Brain, Division of Imaging Sciences and Biomedical Engineering, King’s College London, King’s Health Partners, St. Thomas’ Hospital, London, SE1 7EH, UK
- Université de Paris, NeuroDiderot, Inserm, F-75019 Paris, France
- School of Health and Biomedical Sciences, RMIT University, Bundoora, 3083, VIC, Australia
| | - Pierre Gressens
- Centre for the Developing Brain, Division of Imaging Sciences and Biomedical Engineering, King’s College London, King’s Health Partners, St. Thomas’ Hospital, London, SE1 7EH, UK
- Université de Paris, NeuroDiderot, Inserm, F-75019 Paris, France
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Barks JD, Liu Y, Dopp IA, Silverstein FS. Azithromycin reduces inflammation-amplified hypoxic-ischemic brain injury in neonatal rats. Pediatr Res 2022; 92:415-423. [PMID: 34625655 PMCID: PMC8989723 DOI: 10.1038/s41390-021-01747-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 06/07/2021] [Accepted: 06/16/2021] [Indexed: 11/17/2022]
Abstract
BACKGROUND Systemic inflammation amplifies neonatal hypoxic-ischemic (HI) brain injury. Azithromycin (AZ), an antibiotic with anti-inflammatory properties, improves sensorimotor function and reduces tissue damage after neonatal rat HI brain injury. The objective of this study was to determine if AZ is neuroprotective in two neonatal rat models of inflammation-amplified HI brain injury. DESIGN/METHODS Seven-day-old (P7) rats received injections of toll-like receptor agonists lipopolysaccharide (LPS) or Pam3Cys-Ser-(Lys)4 (PAM) prior to right carotid ligation followed by 50 min (LPS + HI) or 60 min (PAM + HI) in 8% oxygen. Outcomes included contralateral forelimb function (forepaw placing; grip strength), survival, %Intact right hemisphere (brain damage), and a composite score incorporating these measures. We compared postnatal day 35 outcomes in controls and groups treated with three or five AZ doses. Then, we compared P21 outcomes when the first (of five) AZ doses were administered 1, 2, or 4 h after HI. RESULTS In both LPS + HI and PAM + HI models, AZ improved sensorimotor function, survival, brain tissue preservation, and composite scores. Benefits increased with five- vs. three-dose AZ and declined with longer initiation delay. CONCLUSIONS Perinatal systemic infection is a common comorbidity of neonatal asphyxia brain injury and contributes to adverse outcomes. These data support further evaluation of AZ as a candidate treatment for neonatal neuroprotection. IMPACT AZ treatment decreases sensorimotor impairment and severity of brain injury, and improves survival, after inflammation-amplified HI brain injury, and this can be achieved even with a 2 h delay in initiation. This neuroprotective benefit is seen in models of inflammation priming by both Gram-negative and Gram-positive infections. This extends our previous findings that AZ treatment is neuroprotective after HI brain injury in neonatal rats.
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Affiliation(s)
- John D.E. Barks
- Department of Pediatrics, University of Michigan Medical School, The University of Michigan, Ann Arbor, MI
| | - Yiqing Liu
- Department of Pediatrics, University of Michigan Medical School, The University of Michigan, Ann Arbor, MI
| | - Ian A. Dopp
- Department of Pediatrics, University of Michigan Medical School, The University of Michigan, Ann Arbor, MI
| | - Faye S. Silverstein
- Department of Pediatrics, University of Michigan Medical School, The University of Michigan, Ann Arbor, MI,Department of Neurology, University of Michigan Medical School, The University of Michigan, Ann Arbor, MI
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Chavez-Valdez R, Miller S, Spahic H, Vaidya D, Parkinson C, Dietrick B, Brooks S, Gerner GJ, Tekes A, Graham EM, Northington FJ, Everett AD. Therapeutic Hypothermia Modulates the Relationships Between Indicators of Severity of Neonatal Hypoxic Ischemic Encephalopathy and Serum Biomarkers. Front Neurol 2021; 12:748150. [PMID: 34795631 PMCID: PMC8593186 DOI: 10.3389/fneur.2021.748150] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 10/04/2021] [Indexed: 11/13/2022] Open
Abstract
Objective: To determine the changes due to therapeutic hypothermia (TH) exposure in the strength of association between traditional clinical and biochemical indicators of severity of neonatal hypoxic-ischemic encephalopathy (HIE) and serum biomarkers. We hypothesized that culmination of TH changes the strength of the relationships between traditional indicators of severity of HIE and serum biomarkers. Methods: This was a single-center observational cohort study of 178 neonates with HIE treated with TH and followed with serum biomarkers: (i) brain-derived neurotrophic factor (BDNF) and vascular endothelial growth factor (VEGF) (neurotrophins); (ii) tau and glial fibrillary acidic protein (GFAP) (neural cell injury); and (iii) interleukin 6 (IL-6), IL-8, and IL-10 (cytokines), during their first week of life. Adjusted mixed-effect models tested associations with HIE indicators in relation to TH exposure. Results: At admission, lower Apgar scores and base excess (BE) and higher lactate and nucleated red blood cell (NRBC) count correlated with higher Sarnat scores. These indicators of worse HIE severity, including higher Sarnat score, correlated with lower VEGF and higher tau, GFAP, and IL-10 levels at different time points. Within the first 24 h of life, patients with a Sarnat score >2 had lower VEGF levels, whereas only those with score of 3 also had higher GFAP and IL-10 levels. Tau levels increased during TH in patients with Sarnat score of 3, whereas tau and GFAP increased after TH in those with scores of 2. After adjustments, lower VEGF levels during TH and higher tau, GFAP, and IL-10 levels during and after TH were associated with worse Sarnat scores. Tau and GFAP relationship with Sarnat score became stronger after TH. Conclusion: Therapeutic hypothermia exerts an independent modulatory effect in the relationships between traditional indicators of severity of HIE and serum biomarkers after adjustments. Thus, the timing of biomarker testing in relation to TH exposure must be carefully considered if biomarkers are proposed for patient stratification in novel clinical trials.
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Affiliation(s)
- Raul Chavez-Valdez
- Department of Pediatrics, Division of Neonatology, Johns Hopkins University School of Medicine, Baltimore, MD, United States.,Neuroscience Intensive Care Nursery Program, Division of Neonatology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Sarah Miller
- Department of Pediatrics, Division of Neonatology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Harisa Spahic
- Department of Pediatrics, Division of Neonatology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Dhananjay Vaidya
- Department of Internal Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Charlamaine Parkinson
- Department of Pediatrics, Division of Neonatology, Johns Hopkins University School of Medicine, Baltimore, MD, United States.,Neuroscience Intensive Care Nursery Program, Division of Neonatology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Barbara Dietrick
- Department of Pediatrics, Division of Neonatology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Sandra Brooks
- Department of Pediatrics, Division of Neonatology, Johns Hopkins All Children's Hospital, St Petersburg, FL, United States
| | - Gwendolyn J Gerner
- Neuroscience Intensive Care Nursery Program, Division of Neonatology, Johns Hopkins University School of Medicine, Baltimore, MD, United States.,Department of Neuropsychology, Kennedy Krieger Institute, Baltimore, MD, United States.,Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Aylin Tekes
- Neuroscience Intensive Care Nursery Program, Division of Neonatology, Johns Hopkins University School of Medicine, Baltimore, MD, United States.,Department of Radiology, Division of Pediatric Radiology and Pediatric Neuroradiology, Johns Hopkins Hospital, Baltimore, MD, United States
| | - Ernest M Graham
- Neuroscience Intensive Care Nursery Program, Division of Neonatology, Johns Hopkins University School of Medicine, Baltimore, MD, United States.,Department of Obstetrics and Gynecology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Frances J Northington
- Department of Pediatrics, Division of Neonatology, Johns Hopkins University School of Medicine, Baltimore, MD, United States.,Neuroscience Intensive Care Nursery Program, Division of Neonatology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Allen D Everett
- Department of Pediatrics, Division of Pediatric Cardiology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
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5
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Tata DA, Dandi E, Spandou E. Expression of synaptophysin and BDNF in the medial prefrontal cortex following early life stress and neonatal hypoxia-ischemia. Dev Psychobiol 2020; 63:173-182. [PMID: 32623722 DOI: 10.1002/dev.22011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 05/10/2020] [Accepted: 06/04/2020] [Indexed: 01/06/2023]
Abstract
This study aims at investigating whether early stress interacts with brain injury due to neonatal hypoxia-ischemia (HI). To this end, we examined possible changes in synaptophysin (SYN) and brain-derived neurotrophic factor (BDNF) expression in the medial prefrontal cortex (mPFC) of maternally separated rats that were subsequently exposed to a HI episode. Rat pups (n = 11) were maternally separated during postnatal days 1 to 6 (3hr/day), while another group was left undisturbed (n = 11). On postnatal day 7, a subgroup (n = 12) from each postnatal manipulation was exposed to HI. Synaptophysin and BDNF expression was estimated in mPFC prelimbic and anterior cingulate subregions of the ipsilateral and contralateral to the occluded common carotid artery hemispheres. Maternally separated rats expressed significantly less BDNF and SYN in both hemispheres. Neonatal HI significantly reduced BDNF and SYN expression in the ipsilateral mPFC only and this reduction was not further altered by early stress. Our findings indicate the enduring negative effect of a short period of maternal separation on the expression of mPFC SYN and BDNF. They, also, reveal that the HI-associated decreases in these markers are limited to the ipsilateral mPFC and are not exacerbated by early stress. These decreases may have important functional implications given the role of prefrontal area in high-order cognition.
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Affiliation(s)
- Despina A Tata
- Laboratory of Cognitive Neuroscience, School of Psychology, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Evgenia Dandi
- Laboratory of Cognitive Neuroscience, School of Psychology, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Evangelia Spandou
- Laboratory of Experimental Physiology, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
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Lin DQ, Cai XY, Wang CH, Yang B, Liang RS. Optimal concentration of necrostatin-1 for protecting against hippocampal neuronal damage in mice with status epilepticus. Neural Regen Res 2020; 15:936-943. [PMID: 31719260 PMCID: PMC6990772 DOI: 10.4103/1673-5374.268903] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Revised: 03/10/2019] [Accepted: 08/13/2019] [Indexed: 02/05/2023] Open
Abstract
Hippocampal neurons undergo various forms of cell death after status epilepticus. Necrostatin-1 specifically inhibits necroptosis mediated by receptor interacting protein kinase 1 (RIP1) and RIP3 receptors. However, there are no reports of necroptosis in mouse models of status epilepticus. Therefore, in this study, we investigated the effects of necrostatin-1 on hippocampal neurons in mice with status epilepticus, and, furthermore, we tested different amounts of the compound to identify the optimal concentration for inhibiting necroptosis and apoptosis. A mouse model of status epilepticus was produced by intraperitoneal injection of kainic acid, 12 mg/kg. Different concentrations of necrostatin-1 (10, 20, 40, and 80 μM) were administered into the lateral ventricle 15 minutes before kainic acid injection. Hippocampal damage was assessed by hematoxylin-eosin staining 24 hours after the model was successfully produced. Terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling staining, western blot assay and immunohistochemistry were used to evaluate the expression of apoptosis-related and necroptosis-related proteins. Necrostatin-1 alleviated damage to hippocampal tissue in the mouse model of epilepsy. The 40 μM concentration of necrostatin-1 significantly decreased the number of apoptotic cells in the hippocampal CA1 region. Furthermore, necrostatin-1 significantly downregulated necroptosis-related proteins (MLKL, RIP1, and RIP3) and apoptosis-related proteins (cleaved-Caspase-3, Bax), and it upregulated the expression of anti-apoptotic protein Bcl-2. Taken together, our findings show that necrostatin-1 effectively inhibits necroptosis and apoptosis in mice with status epilepticus, with the 40 μM concentration of the compound having an optimal effect. The experiments were approved by the Animal Ethics Committee of Fujian Medical University, China (approval No. 2016-032) on November 9, 2016.
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Affiliation(s)
- Dong-Qi Lin
- Department of Cardiothoracic Surgery, the Second Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong Province, China
- Department of Neurosurgery, Union Hospital, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Xin-Ying Cai
- Clinical Research Center, Shantou Central Hospital, Affiliated Shantou Hospital of Sun Yat-sen University, Shantou, Guangdong Province, China
| | - Chun-Hua Wang
- Department of Neurosurgery, Union Hospital, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Bin Yang
- Department of Neurosurgery, Union Hospital, Fujian Medical University, Fuzhou, Fujian Province, China
| | - Ri-Sheng Liang
- Department of Neurosurgery, Union Hospital, Fujian Medical University, Fuzhou, Fujian Province, China
- Correspondence to: Ri-Sheng Liang, .
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Tomlinson RE, Christiansen BA, Giannone AA, Genetos DC. The Role of Nerves in Skeletal Development, Adaptation, and Aging. Front Endocrinol (Lausanne) 2020; 11:646. [PMID: 33071963 PMCID: PMC7538664 DOI: 10.3389/fendo.2020.00646] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 08/07/2020] [Indexed: 12/24/2022] Open
Abstract
The skeleton is well-innervated, but only recently have the functions of this complex network in bone started to become known. Although our knowledge of skeletal sensory and sympathetic innervation is incomplete, including the specific locations and subtypes of nerves in bone, we are now able to reconcile early studies utilizing denervation models with recent work dissecting the molecular signaling between bone and nerve. In total, sensory innervation functions in bone much as it does elsewhere in the body-to sense and respond to stimuli, including mechanical loading. Similarly, sympathetic nerves regulate autonomic functions related to bone, including homeostatic remodeling and vascular tone. However, more study is required to translate our current knowledge of bone-nerve crosstalk to novel therapeutic strategies that can be effectively utilized to combat skeletal diseases, disorders of low bone mass, and age-related decreases in bone quality.
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Affiliation(s)
- Ryan E. Tomlinson
- Department of Orthopaedic Surgery, Thomas Jefferson University, Philadelphia, PA, United States
- *Correspondence: Ryan E. Tomlinson
| | - Blaine A. Christiansen
- Department of Orthopaedic Surgery, School of Medicine, University of California, Davis, Sacramento, CA, United States
| | - Adrienne A. Giannone
- Department of Anatomy, Physiology, and Cell Biology, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States
| | - Damian C. Genetos
- Department of Anatomy, Physiology, and Cell Biology, School of Veterinary Medicine, University of California, Davis, Davis, CA, United States
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Kletkiewicz H, Rogalska J. Decreased body temperature during anoxia affects the endogenous BDNF level in tertiary phase of injury. Neurosci Lett 2019; 711:134413. [PMID: 31394123 DOI: 10.1016/j.neulet.2019.134413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 07/14/2019] [Accepted: 08/02/2019] [Indexed: 11/25/2022]
Abstract
Asphyxia before, during, or after birth is an important cause of perinatal mortality and morbidity. The mechanism underlying neurological damage resulting from anoxia episode is complex and is not limited to the anoxia episode. Although the benefits of therapeutic hypothermia in secondary failure of oxidative metabolism have long been known, the principle of this therapy in tertiary phase of repair and reorganization have not yet to be fully elucidated. Currently brain-derived neurotrophic factor (BDNF) is also considered to be beneficial to neuronal survival. Therefore, our experiments aimed at determining the effects of low body temperature during simulated perinatal anoxia on the level of the neurotrophic brain-derived factor (BDNF) and on the correlation between the level of BDNF (proBDNF and mBDNF) and the level of active caspase-3 (marker of apoptosis) in developing brain in tertiary phase after exposure. The results demonstrated that the ability of BDNF to inhibit caspase-3 activation and subsequent apoptosis likely accounts in large part for its protection against neuronal damage only in rats maintaining the low body temperature.
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Affiliation(s)
- Hanna Kletkiewicz
- Department of Animal Physiology, Faculty of Biology and Environmental Protection, Nicolaus Copernicus University, Lwowska 1, Toruń, 87-100, Poland.
| | - Justyna Rogalska
- Department of Animal Physiology, Faculty of Biology and Environmental Protection, Nicolaus Copernicus University, Lwowska 1, Toruń, 87-100, Poland.
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9
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Repurposing azithromycin for neuroprotection in neonates. Pediatr Res 2019; 86:423-424. [PMID: 31129682 DOI: 10.1038/s41390-019-0443-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Accepted: 05/16/2019] [Indexed: 12/24/2022]
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10
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Repurposing azithromycin for neonatal neuroprotection. Pediatr Res 2019; 86:444-451. [PMID: 31100754 PMCID: PMC6764891 DOI: 10.1038/s41390-019-0408-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 04/10/2019] [Accepted: 04/11/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND Inflammation contributes to neonatal hypoxic-ischemic brain injury pathogenesis. We evaluated the neuroprotective efficacy of azithromycin, a safe, widely available antibiotic with anti-inflammatory properties, in a neonatal rodent hypoxic-ischemic brain injury model. METHODS Seven-day-old rats underwent right carotid artery ligation followed by 90-min 8% oxygen exposure; this procedure elicits quantifiable left forepaw functional impairment and right cerebral hemisphere damage. Sensorimotor function (vibrissae-stimulated forepaw placing, grip strength) and brain damage were compared in azithromycin- and saline-treated littermates 2-4 weeks later. Multiple treatment protocols were evaluated (variables included doses ranging from 15 to 45 mg/kg; treatment onset 15 min to 4 h post-hypoxia, and comparison of 1 vs. 3 injections). RESULTS All azithromycin doses improved function and reduced brain damage; efficacy was dose dependent, and declined with increasing treatment delay. Three azithromycin injections, administered over 48 h, improved performance on both function measures and reduced brain damage more than a single dose. CONCLUSION In this neonatal rodent model, azithromycin improved functional and neuropathology outcomes. If supported by confirmatory studies in complementary neonatal brain injury models, azithromycin could be an attractive candidate drug for repurposing and evaluation for neonatal neuroprotection in clinical trials.
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11
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Chavez-Valdez R, Emerson P, Goffigan-Holmes J, Kirkwood A, Martin LJ, Northington FJ. Delayed injury of hippocampal interneurons after neonatal hypoxia-ischemia and therapeutic hypothermia in a murine model. Hippocampus 2019; 28:617-630. [PMID: 29781223 DOI: 10.1002/hipo.22965] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 05/03/2018] [Accepted: 05/13/2018] [Indexed: 01/29/2023]
Abstract
Delayed hippocampal injury and memory impairments follow neonatal hypoxia-ischemia (HI) despite the use of therapeutic hypothermia (TH). Death of hippocampal pyramidal cells occurs acutely after HI, but characterization of delayed cell death and injury of interneurons (INs) is unknown. We hypothesize that injury of INs after HI is: (i) asynchronous to that of pyramidal cells, (ii) independent of injury severity, and (iii) unresponsive to TH. HI was induced in C57BL6 mice at p10 with unilateral right carotid ligation and 45 min of hypoxia (FiO2 = 0.08). Mice were randomized to normothermia (36 °C, NT) or TH (31 °C) for 4 hr after HI and anesthesia-exposed shams were use as controls. Brains were studied at 24 hr (p11) or 8 days (p18) after HI. Vglut1, GAD65/67, PSD95, parvalbumin (PV) and calbindin-1 (Calb1) were measured. Cell death was assessed using cresyl violet staining and TUNEL assay. Hippocampal atrophy and astroglyosis at p18 were used to assess injury severity and to correlate with number of PV + INs. VGlut1 level decreased by 30% at 24 hr after HI, while GAD65/67 level decreased by ∼50% in forebrain 8 days after HI, a decrease localized in CA1 and CA3. PSD95 levels decreased in forebrain by 65% at 24 hr after HI and remained low 8 days after HI. PV + INs increased in numbers (per mm2 ) and branching between p11 and p18 in sham mice but not in NT and TH mice, resulting in 21-52% fewer PV + INs in injured mice at p18. Calb1 protein and mRNA were also reduced in HI injured mice at p18. At p18, somatodendritic attrition of INs was evident in all injured mice without evidence of cell death. Neither hippocampal atrophy nor astroglyosis correlated with the number of PV + INs at p18. Thus, HI exposure has long lasting effects in the hippocampus impairing the development of the GABAergic system with only partial protection by TH independent of the degree of hippocampal injury. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Raul Chavez-Valdez
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Paul Emerson
- Department of Neuroscience, The Zanvyl Krieger Mind/Brain Institute, Johns Hopkins University, Baltimore, Maryland
| | - Janasha Goffigan-Holmes
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Alfredo Kirkwood
- Department of Neuroscience, The Zanvyl Krieger Mind/Brain Institute, Johns Hopkins University, Baltimore, Maryland
| | - Lee J Martin
- Department of Neuroscience, Johns Hopkins School of Medicine, Baltimore, Maryland.,Department of Pathology, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Frances J Northington
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, Maryland
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Kletkiewicz H, Maliszewska J, Jaworski K, Jermacz Ł, Smoliński DJ, Rogalska J. Thermal conditions during neonatal anoxia affect the endogenous level of brain-derived neurotrophic factor. J Neurosci Res 2019; 97:1266-1277. [PMID: 31257630 DOI: 10.1002/jnr.24486] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 06/11/2019] [Accepted: 06/11/2019] [Indexed: 12/19/2022]
Abstract
Anoxia during delivery is a complication that can disturb infant brain development leading to various types of neurological disorders. Our studies have shown that increased body temperature of newborn rats of both sexes intensifies the postanoxic oxidative stress and prevents triggering the endogenous adaptive response such as HIF-1α activation. Currently, brain-derived neurotrophic factor-BDNF is considered to be a modulator of neuronal plasticity. In the developing brain, mature BDNF and its precursor exhibit prosurvival action through the TrkB receptor and proapoptotic functions binding to p75NTR , respectively. The aim of our experiments was to check the effects of body temperature on the postanoxic level of BDNF and on the expression of its receptors as well as on the marker of apoptosis-caspase-3 in the rat brain. Two-day-old Wistar Han rats (male/female ratio, 1:1) were exposed to anoxia in 100% nitrogen atmosphere for 10 min in different thermal conditions, which allowed them to regulate their rectal temperature at the following levels: normothermic-33°C; hyperthermic-37°C; and extremely hyperthermic-39°C. Thermal conditions during neonatal anoxia affected the level of proBDNF, BDNF as well as their receptors and caspase-3 in the forebrain. The increased BDNF protein level followed by decreased caspase-3 protein level was probably dependent on body temperature under anoxic conditions and was observed only in rats maintaining decreased body temperature. The positive effect of BDNF was not observed under hyperthermic conditions. Moreover, BDNF level changes correlated with body temperature probably affected the learning and spatial memory in juvenile rats.
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Affiliation(s)
- Hanna Kletkiewicz
- Department of Animal Physiology, Faculty of Biology and Environmental Protection, Nicolaus Copernicus University, Toruń, Poland
| | - Justyna Maliszewska
- Department of Animal Physiology, Faculty of Biology and Environmental Protection, Nicolaus Copernicus University, Toruń, Poland
| | - Krzysztof Jaworski
- Chair of Plant Physiology and Biotechnology, Faculty of Biology and Environmental Protection, Nicolaus Copernicus University, Toruń, Poland
| | - Łukasz Jermacz
- Department of Hydrobiology, Faculty of Biology and Environmental Protection, Nicolaus Copernicus University, Toruń, Poland
| | - Dariusz J Smoliński
- Department of Cellular and Molecular Biology, Faculty of Biology and Environmental Protection, Nicolaus Copernicus University, Toruń, Poland.,Centre for Modern Interdisciplinary Technologies, Nicolaus Copernicus University, Toruń, Poland
| | - Justyna Rogalska
- Department of Animal Physiology, Faculty of Biology and Environmental Protection, Nicolaus Copernicus University, Toruń, Poland
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13
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Chavez-Valdez R, Mottahedin A, Stridh L, Yellowhair TR, Jantzie LL, Northington FJ, Mallard C. Evidence for Sexual Dimorphism in the Response to TLR3 Activation in the Developing Neonatal Mouse Brain: A Pilot Study. Front Physiol 2019; 10:306. [PMID: 30971945 PMCID: PMC6443881 DOI: 10.3389/fphys.2019.00306] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 03/07/2019] [Indexed: 01/23/2023] Open
Abstract
Toll-like receptor (TLR)3 activation during the neonatal period produces responses linked to the origins of neuropsychiatric disorders. Although there is sexual dimorphism in neuropsychiatric disorders, it is unknown if brain responses to TLR3 activation are sex-specific. We hypothesized that poly I:C in a post-natal day (P)8 model induces a sexually dimorphic inflammatory responses. C57BL6 mice received intraperitoneal injection of poly I:C (10 mg/kg) or vehicle [normal saline (NS)] at P8. Pups were killed at 6 or 14 h for caspase 3 and 8 activity assays, NFkB ELISA, IRF3, AP1, and GFAP western blotting and cytokines/chemokines gene expression real time qRT-PCR (4–6/group). A second group of pups were killed at 24 h (P9) or 7 days (P15) after poly I:C to assess astrocytic (GFAP) and microglia (Iba1) activation in the hippocampus, thalamus and cortex using immunohistochemistry, and gene and protein expression of cytokines/chemokines using real time RT-PCR and MSD, respectively (4–6/group). Non-parametric analysis was applied. Six hours after poly I:C, caspase-3 and -8 activities in cytosolic fractions were 1.6 and 2.8-fold higher in poly I:C-treated than in NS-treated female mice, respectively, while gene expressions of pro-inflammatory cytokines were upregulated in both sexes. After poly I:C, IRF3 nuclear translocation occurred earlier (6 h) in female mice and later (14 h) in male mice. At 14 h after poly I:C, only male mice also had increased nuclear NFκB levels (88%, p < 0.001) and GFAP expression coinciding with persistent IL-6 and FAS gene upregulation (110 and 77%, respectively; p < 0.001) and IL-10 gene downregulation (-42%, p < 0.05). At 24 h after poly I:C, IL-1β, CXCL-10, TNF-α, and MCP-1 were similarly increased in both sexes but at 7 days after exposure, CXCL-10 and INFγ were increased and IL-10 was decreased only in female mice. Accordingly, microglial activation persisted at 7 days after poly I:C in the hippocampus, thalamus and cortex of female mice. This preliminary study suggests that TLR3 activation may produce in the developing neonatal mouse brain a sexually dimorphic response with early activation of caspase-dependent pathways in female mice, activation of inflammatory cascades in both sexes, which then persists in female mice. Further well-powered studies are essential to confirm these sex-specific findings.
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Affiliation(s)
- Raul Chavez-Valdez
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Amin Mottahedin
- Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Linnea Stridh
- Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Tracylyn R Yellowhair
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD, United States.,Department of Pediatrics and Department of Neurosciences, The University of New Mexico, Albuquerque, NM, United States
| | - Lauren L Jantzie
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD, United States.,Department of Pediatrics and Department of Neurosciences, The University of New Mexico, Albuquerque, NM, United States
| | - Frances J Northington
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Carina Mallard
- Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,Henan Key Laboratory of Child Brain Injury, The Third Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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14
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BDNF-mediated mitophagy alleviates high-glucose-induced brain microvascular endothelial cell injury. Apoptosis 2019; 24:511-528. [DOI: 10.1007/s10495-019-01535-x] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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15
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McNally MA, Chavez-Valdez R, Felling RJ, Flock DL, Northington FJ, Stafstrom CE. Seizure Susceptibility Correlates with Brain Injury in Male Mice Treated with Hypothermia after Neonatal Hypoxia-Ischemia. Dev Neurosci 2019; 40:1-10. [PMID: 30820019 PMCID: PMC9109068 DOI: 10.1159/000496468] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Accepted: 12/20/2018] [Indexed: 11/19/2022] Open
Abstract
Hypoxic-ischemic encephalopathy is a common neonatal brain injury associated with significant morbidity and mortality despite the administration of therapeutic hypothermia (TH). Neonatal seizures and subsequent chronic epilepsy are frequent in this patient population and current treatments are partially effective. We used a neonatal murine hypoxia-ischemia (HI) model to test whether the severity of hippocampal and cortical injury predicts seizure susceptibility 8 days after HI and whether TH mitigates this susceptibility. HI at postnatal day 10 (P10) caused hippocampal injury not mitigated by TH in male or female pups. TH did not confer protection against flurothyl seizure susceptibility at P18 in this model. Hippocampal (R2 = 0.33, p = 0.001) and cortical (R2 = 0.33, p = 0.003) injury directly correlated with seizure susceptibility in male but not female pups. Thus, there are sex-specific consequences of neonatal HI on flurothyl seizure susceptibility in a murine neonatal HI model. Further studies are necessary to elucidate the underlying mechanisms of sex dimorphism in seizure susceptibility after neonatal HI.
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Affiliation(s)
- Melanie A McNally
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA,
- Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA,
| | - Raul Chavez-Valdez
- Department of Pediatrics (Neonatology), Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Ryan J Felling
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Debra L Flock
- Department of Pediatrics (Neonatology), Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Frances J Northington
- Department of Pediatrics (Neonatology), Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Carl E Stafstrom
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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Zafer D, Aycan N, Ozaydin B, Kemanli P, Ferrazzano P, Levine JE, Cengiz P. Sex differences in Hippocampal Memory and Learning following Neonatal Brain Injury: Is There a Role for Estrogen Receptor-α? Neuroendocrinology 2019; 109:249-256. [PMID: 30884486 PMCID: PMC6893032 DOI: 10.1159/000499661] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2018] [Accepted: 03/17/2019] [Indexed: 01/11/2023]
Abstract
Neonatal encephalopathy due to hypoxia-ischemia (HI) leads to severe, life-long morbidities in thousands of neonates born in the USA and worldwide each year. Varying capacities of long-term episodic memory, verbal working memory, and learning can present without cerebral palsy and have been associated with the severity of neonatal encephalopathy sustained at birth. Among children who sustain a moderate degree of HI at birth, girls have larger hippocampal volumes compared to boys. Clinical studies indicate that female neonatal brains are more resistant to the effects of neonatal HI, resulting in better long-term cognitive outcomes compared to males with comparable brain injury. Our most recent mechanistic studies have addressed the origins and cellular basis of sex differences in hippocampal neuroprotection following neonatal HI-related brain injury and implicate estrogen receptor-α (ERα) in the neurotrophin receptor-mediated hippocampal neuroprotection in female mice. This review summarizes the recent findings on ERα-dependent, neurotrophin-mediated hippocampal neuroprotection and weighs the evidence that this mechanism plays an important role in preservation of long-term memory and learning following HI in females.
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Affiliation(s)
- Dila Zafer
- Waisman Center, University of Wisconsin, Madison, Wisconsin, USA
| | - Nur Aycan
- Waisman Center, University of Wisconsin, Madison, Wisconsin, USA
| | - Burak Ozaydin
- Waisman Center, University of Wisconsin, Madison, Wisconsin, USA
| | - Pinar Kemanli
- Waisman Center, University of Wisconsin, Madison, Wisconsin, USA
| | - Peter Ferrazzano
- Waisman Center, University of Wisconsin, Madison, Wisconsin, USA
- Division of Pediatric Critical Care Medicine, Department of Pediatrics, University of Wisconsin, Madison, Wisconsin, USA
| | - Jon E Levine
- Department of Neuroscience, University of Wisconsin, Madison, Wisconsin, USA
- Wisconsin National Primate Research Center, Madison, Wisconsin, USA
| | - Pelin Cengiz
- Waisman Center, University of Wisconsin, Madison, Wisconsin, USA,
- Division of Pediatric Critical Care Medicine, Department of Pediatrics, University of Wisconsin, Madison, Wisconsin, USA,
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17
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Mason B, Rollins LG, Asumadu E, Cange C, Walton N, Donaldson ST. Nesting Environment Provides Sex-Specific Neuroprotection in a Rat Model of Neonatal Hypoxic-Ischemic Injury. Front Behav Neurosci 2018; 12:221. [PMID: 30356904 PMCID: PMC6190890 DOI: 10.3389/fnbeh.2018.00221] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 09/03/2018] [Indexed: 11/17/2022] Open
Abstract
Hypoxic-ischemic (HI) encephalopathy is a devastating injury that occurs when the fetal brain is deprived of oxygen and blood to a degree that may lead to neurological damage, seizing and cerebral palsy. In rodents, early environmental enrichment that promotes maternal care-taking behavior (mCTB) can improve neurobehavioral outcomes and protect against neurological decline. We hypothesized that an enhanced nesting environment would improve mCTB as measured by pup weight gain, and support greater HI recovery in developing rats. Pregnant dams (E15-16) were introduced to either control Standard Facility (SF) housing or closed nestbox (CN) conditions and maintained in larger cages through pup weaning. On postnatal day (PND) 7, male and female Long-Evans rat pups (N = 73) were randomly sorted into one of two surgical conditions: control and HI. HI pups received isoflurane anesthesia and right carotid artery ligation, a 2-h rest followed by 90 min exposure to a moist hypoxic (92% N, 8% O2) chamber. Pups (PND 8) were weighed daily, and tested on the Morris Water Maze (MWM) task (PND 35-50). Results demonstrate significant differences afforded to male and female pups based on weight measure, where CN-rearing modifies pre-weaning adolescent weights in females and increases post-weaning weights in males and females by an average of 10 g. Following successful MWM training and acquisition (PND 35-37), both male and female CN-raised animals demonstrated faster latency to find the hidden platform (HP) during HP trials (PND 38-42) and appeared to freely explore the MWM pool during an additional probe trial (PND 43). Moreover, after sacrifice (PND 60), CN rearing created sex-specific alterations in brain-derived neurotrophic factor (BDNF), glial-derived neurotrophic factor (GDNF) immunopositive cell staining of the dorsomedial striatum and CA1 of the hippocampus. CN-rearing afforded HI males higher BDNF levels in the striatum and produced greater GDNF levels in the hippocampus of HI-injured females. These results suggest that early life environmental enrichment positively modifies nesting environment, increases weight gain, as well as spatial learning and memory in a sex-specific directionality. Our findings also implicate correlative changes in corticolimbic neurotrophin protein levels in the CN-reared animals that may contribute to these benefits.
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Affiliation(s)
- Briana Mason
- Developmental and Brain Sciences, Department of Psychology, University of Massachusetts Boston, Boston, MA, United States
| | - L. G. Rollins
- Clinical Psychology Program, Department of Psychology, University of Massachusetts Boston, Boston, MA, United States
- Warren Alpert Medical School, Department of Psychiatry, Brown University, Providence, RI, United States
| | - Evans Asumadu
- Developmental and Brain Sciences, Department of Psychology, University of Massachusetts Boston, Boston, MA, United States
| | - Christina Cange
- Developmental and Brain Sciences, Department of Psychology, University of Massachusetts Boston, Boston, MA, United States
| | - Najah Walton
- Developmental and Brain Sciences, Department of Psychology, University of Massachusetts Boston, Boston, MA, United States
| | - S. Tiffany Donaldson
- Developmental and Brain Sciences, Department of Psychology, University of Massachusetts Boston, Boston, MA, United States
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18
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Sex-specific differences in corticosterone secretion, behavioral phenotypes and expression of TrkB.T1 and TrkB.FL receptor isoforms: Impact of systemic TrkB inhibition and combinatory stress exposure in adolescence. Prog Neuropsychopharmacol Biol Psychiatry 2018; 86:10-23. [PMID: 29753050 DOI: 10.1016/j.pnpbp.2018.05.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 04/04/2018] [Accepted: 05/08/2018] [Indexed: 12/12/2022]
Abstract
Stress exposure has been implicated in the development of mood disorders, although little is known about the lasting effects of repeated stress during the adolescent period on sex-specific differences in endocrine and plasticity-signaling responses in adulthood. Using a 10-day combinatory stress paradigm (postnatal day (PND) 26 to 35), we examined sex-specific impact of adolescent stress and inhibition of tyrosine-related kinase B (TrkB) receptor (ANA-12; 0.5 mg/kg, i.p.) on 1) adolescent blood corticosterone levels, 2) adult locomotion and anxiety-like behavior, and 3) region-specific differences in endogenous TrkB full-length (TrkB.FL) and truncated (TrkB.T1) receptor isoforms. Blood collected on days 1, 5 and 10 revealed elevated basal and stress-induced CORT secretion in females compared to males, while ANA-12 attenuated CORT elevations post stress in both sexes. As adults, all females exhibited higher locomotor and exploratory activity than males in the open field test and elevated plus maze, and differences were comparable in the forced swim within stress-naïve and stress groups. Biochemically, vehicle-treated males showed elevated TrkB.T1 and TrkB.FL compared to vehicle-treated females in the PFC, hippocampus and NAc, and levels were consistently attenuated by ANA-12 treatment in non-stress males. With regards to stress exposure, expression of both isoforms was strongly down-regulated in the NAc of males only and was associated with increased TrkB.T1 in the PFC. ANA-12 enhanced expression in females, independent of stress exposure, compared to vehicle-treated counterparts, expression being increased for TrkB.T1 versus TrkB.FL and magnitude of the changes being region-specific. In contrast, ANA-12 effects in stressed males were restricted to inhibition of both isoforms in the hippocampus. Together, our findings support that TrkB activation, contingent on stress exposure, differentially affects TrkB isoform regulation during adulthood. Sex-specific biochemical responses at delayed intervals following adolescent stress exposure further support the need to include the sex variable in animal models.
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19
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Sukhanova IA, Sebentsova EA, Khukhareva DD, Manchenko DM, Glazova NY, Vishnyakova PA, Inozemtseva LS, Dolotov OV, Vysokikh MY, Levitskaya NG. Gender-dependent changes in physical development, BDNF content and GSH redox system in a model of acute neonatal hypoxia in rats. Behav Brain Res 2018; 350:87-98. [PMID: 29753727 DOI: 10.1016/j.bbr.2018.05.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Revised: 04/17/2018] [Accepted: 05/08/2018] [Indexed: 02/07/2023]
Abstract
Perinatal hypoxia-ischaemia is one of the leading factors that negatively influence the development of the central nervous system. Our aim was to investigate the effects of sex on the outcomes of acute neonatal hypoxia (ANH) in rat pups. Male and female Wistar rats were exposed to a hypoxic condition (8% oxygen for 120 min) at postnatal day 2 (P2). Immediately after ANH an increase in HIF1-α gene expression was observed in the rat brains, independently of sex. Brain-derived neurotrophic factor (BDNF) and glutathione peroxidase-4 gene expression was increased in female animals only. Hypoxic pups of both sexes showed a decreased reduced/oxidised glutathione (GSH/GSSG) ratio in the blood and only males had an increased GSH content in the whole brain immediately after hypoxia. Furthermore, an increased BDNF content in the brain was found in both male and female rat pups at 0 h and in serum 4 h after hypoxia, but at 4 h after hypoxia only males had an increased BDNF level in the brain. Only hypoxic males displayed retarded performance in the righting reflex, but in a negative geotaxis test hypoxic pups of both sexes had an increased turnaround time. Moreover, hypoxic female but not male pups demonstrated less weight gain than control littermates for the entire observation period (until P18). These results demonstrate that ANH at P2 leads to both molecular and physiological impairments in a sex-specific manner and the described model could be used to represent mild hypoxic brain damage in very preterm infants.
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Affiliation(s)
- Iu A Sukhanova
- Lomonosov Moscow State University, Biology Faculty, Moscow, Russia; Federal State Budget Institution 'Research Centre for Obstetrics Gynaecology and Perinatology' Ministry of Healthcare and Social Development of the Russian Federation, Moscow, Russia.
| | - E A Sebentsova
- Institute of Molecular Genetics, Russian Academy of Science, Moscow, Russia
| | - D D Khukhareva
- Lomonosov Moscow State University, Biology Faculty, Moscow, Russia
| | - D M Manchenko
- Lomonosov Moscow State University, Biology Faculty, Moscow, Russia
| | - N Yu Glazova
- Institute of Molecular Genetics, Russian Academy of Science, Moscow, Russia
| | - P A Vishnyakova
- Federal State Budget Institution 'Research Centre for Obstetrics Gynaecology and Perinatology' Ministry of Healthcare and Social Development of the Russian Federation, Moscow, Russia
| | - L S Inozemtseva
- Institute of Molecular Genetics, Russian Academy of Science, Moscow, Russia
| | - O V Dolotov
- Institute of Molecular Genetics, Russian Academy of Science, Moscow, Russia
| | - M Y Vysokikh
- Federal State Budget Institution 'Research Centre for Obstetrics Gynaecology and Perinatology' Ministry of Healthcare and Social Development of the Russian Federation, Moscow, Russia
| | - N G Levitskaya
- Lomonosov Moscow State University, Biology Faculty, Moscow, Russia; Institute of Molecular Genetics, Russian Academy of Science, Moscow, Russia
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Kichev A, Baburamani AA, Vontell R, Gressens P, Burkly L, Thornton C, Hagberg H. TWEAK Receptor Deficiency Has Opposite Effects on Female and Male Mice Subjected to Neonatal Hypoxia-Ischemia. Front Neurol 2018; 9:230. [PMID: 29706927 PMCID: PMC5906546 DOI: 10.3389/fneur.2018.00230] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 03/23/2018] [Indexed: 11/13/2022] Open
Abstract
Tumor necrosis factor (TNF)-like weak inducer of apoptosis (TWEAK) is a multifunctional cytokine member of the TNF family. TWEAK binds to its only known receptor, Fn14, enabling it to activate downstream signaling processes in response to tissue injury. The aim of this study was to investigate the role of TWEAK signaling in neonatal hypoxia–ischemia (HI). We found that after neonatal HI, both TWEAK and Fn14 expression were increased to a greater extent in male compared with female mice. To assess the role of TWEAK signaling after HI, the size of the injury was measured in neonatal mice genetically deficient in Fn14 and compared with their wild-type and heterozygote littermates. A significant sex difference in the Fn14 knockout (KO) animals was observed. Fn14 gene KO was beneficial in females; conversely, reducing Fn14 expression exacerbated the brain injury in male mice. Our findings indicate that the TWEAK/Fn14 pathway is critical for development of hypoxic–ischemic brain injury in immature animals. However, as the responses are different in males and females, clinical implementation depends on development of sex-specific therapies.
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Affiliation(s)
- Anton Kichev
- Perinatal Brain Injury Group, Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, Kings College London, King's Health Partners, St. Thomas' Hospital, London, United Kingdom
| | - Ana A Baburamani
- Perinatal Brain Injury Group, Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, Kings College London, King's Health Partners, St. Thomas' Hospital, London, United Kingdom
| | - Regina Vontell
- Perinatal Brain Injury Group, Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, Kings College London, King's Health Partners, St. Thomas' Hospital, London, United Kingdom
| | - Pierre Gressens
- Perinatal Brain Injury Group, Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, Kings College London, King's Health Partners, St. Thomas' Hospital, London, United Kingdom.,PROTECT, INSERM, Université Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Linda Burkly
- Department of Neuroinflammation, Biogen, Cambridge, MA, United States
| | - Claire Thornton
- Perinatal Brain Injury Group, Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, Kings College London, King's Health Partners, St. Thomas' Hospital, London, United Kingdom
| | - Henrik Hagberg
- Perinatal Brain Injury Group, Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, Kings College London, King's Health Partners, St. Thomas' Hospital, London, United Kingdom.,Perinatal Center, Institute of Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,Perinatal Center, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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Enomoto S, Shimizu K, Nibuya M, Suzuki E, Nagata K, Kondo T. Activated brain-derived neurotrophic factor/TrkB signaling in rat dorsal and ventral hippocampi following 10-day electroconvulsive seizure treatment. Neurosci Lett 2017; 660:45-50. [DOI: 10.1016/j.neulet.2017.09.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 08/31/2017] [Accepted: 09/06/2017] [Indexed: 12/15/2022]
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Rodríguez-Fanjul J, Durán Fernández-Feijóo C, Lopez-Abad M, Lopez Ramos MG, Balada Caballé R, Alcántara-Horillo S, Camprubí Camprubí M. Neuroprotection with hypothermia and allopurinol in an animal model of hypoxic-ischemic injury: Is it a gender question? PLoS One 2017; 12:e0184643. [PMID: 28931035 PMCID: PMC5606927 DOI: 10.1371/journal.pone.0184643] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 08/28/2017] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Hypoxic-ischemic encephalopathy (HIE) is one of the most important causes of neonatal brain injury. Therapeutic hypothermia (TH) is the standard treatment for term newborns after perinatal hypoxic ischemic injury (HI). Despite this, TH does not provide complete neuroprotection. Allopurinol seems to be a good neuroprotector in several animal studies, but it has never been tested in combination with hypothermia. Clinical findings show that male infants with (HI) fare more poorly than matched females in cognitive outcomes. However, there are few studies about neuroprotection taking gender into account in the results. The aim of the present study was to evaluate the potential additive neuroprotective effect of allopurinol when administrated in association with TH in a rodent model of moderate HI. Gender differences in neuroprotection were also evaluated. METHODS P10 male and female rat pups were subjected to HI (Vannucci model) and randomized into five groups: sham intervention (Control), no treatment (HI), hypothermia (HIH), allopurinol (HIA), and dual therapy (hypothermia and allopurinol) (HIHA). To evaluate a treatment's neuroprotective efficiency, 24 hours after the HI event caspase3 activation was measured. Damaged area and hippocampal volume were also measured 72 hours after the HI event. Negative geotaxis test was performed to evaluate early neurobehavioral reflexes. Learning and spatial memory were assessed via Morris Water Maze (MWM) test at 25 days of life. RESULTS Damaged area and hippocampal volume were different among treatment groups (p = 0.001). The largest tissue lesion was observed in the HI group, followed by HIA. There were no differences between control, HIH, and HIHA. When learning process was analyzed, no differences were found. Females from the HIA group had similar results to the HIH and HIHA groups. Cleaved caspase 3 expression was increased in both HI and HIA. Despite this, in females cleaved caspase-3 was only differently increased in the HI group. All treated animals present an improvement in short-term (Negative geotaxis) and long-term (WMT) functional tests. Despite this, treated females present better long-term outcome. In short-term outcome no sex differences were observed. CONCLUSIONS Our results suggest that dual therapy confers great neuroprotection after an HI event. There were functional, histological, and molecular improvements in all treated groups. These differences were more important in females than in males. No statistically significant differences were found between HIHA and HIH; both of them present a great improvement. Our results support the idea of different regulation mechanisms and pathways of cell death, depending on gender.
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Affiliation(s)
| | | | - Míriam Lopez-Abad
- Department of Neonatology, BCNatal, Sant Joan de Déu-Hospital Clínic, Barcelona, Spain
| | | | - Rafael Balada Caballé
- Department of Pathology and Experimental Therapeutics, Faculty of Medicine and Biomedical Sciences, Bellvitge Campus, University of Barcelona, Barcelona, Spain
| | - Soledad Alcántara-Horillo
- Department of Pathology and Experimental Therapeutics, Faculty of Medicine and Biomedical Sciences, Bellvitge Campus, University of Barcelona, Barcelona, Spain
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Sanches EF, Durán-Carabali LE, Tosta A, Nicola F, Schmitz F, Rodrigues A, Siebert C, Wyse A, Netto C. Pregnancy swimming causes short- and long-term neuroprotection against hypoxia-ischemia in very immature rats. Pediatr Res 2017; 82:544-553. [PMID: 28426648 DOI: 10.1038/pr.2017.110] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 03/15/2017] [Indexed: 11/09/2022]
Abstract
BackgroundHypoxia-ischemia (HI) is a major cause of neurological damage in preterm newborn. Swimming during pregnancy alters the offspring's brain development. We tested the effects of swimming during pregnancy in the very immature rat brain.MethodsFemale Wistar rats (n=12) were assigned to the sedentary (SE, n=6) or the swimming (SW, n=6) group. From gestational day 0 (GD0) to GD21 the rats in the SW group were made to swim for 20 min/day. HI on postnatal day (PND) 3 rats caused sensorimotor and cognitive impairments. Animals were distributed into SE sham (SESH), sedentary HIP3 (SEHI), swimming sham (SWSH), and swimming HIP3 (SWHI) groups. At PND4 and PND5, Na+/K+-ATPase activity and brain-derived neurotrophic factor (BDNF) levels were assessed. During lactation and adulthood, neurological reflexes, sensorimotor, anxiety-related, and cognitive evaluations were made, followed by histological assessment at PND60.ResultsAt early stages, swimming caused an increase in hippocampal BDNF levels and in the maintenance of Na+/K+-ATPase function in the SWHI group. The SWHI group showed smaller lesions and the preservation of white matter tracts. SEHI animals showed a delay in reflex maturation, which was reverted in the SWHI group. HIP3 induced spatial memory deficits and hypomyelination in SEHI rats, which was reverted in the SWHI group.ConclusionSwimming during pregnancy neuroprotected the brains against HI in very immature neonatal rats.
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Affiliation(s)
- Eduardo Farias Sanches
- Post-Graduation Program of Biochemistry, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Luz Elena Durán-Carabali
- Post-Graduation Program of Phisiology, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Andrea Tosta
- Department of Biochemistry, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Fabrício Nicola
- Post-Graduation Program of Neurosciences, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Felipe Schmitz
- Post-Graduation Program of Biochemistry, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - André Rodrigues
- Post-Graduation Program of Biochemistry, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Cassiana Siebert
- Post-Graduation Program of Biochemistry, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.,Department of Biochemistry, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Angela Wyse
- Department of Biochemistry, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Carlos Netto
- Department of Biochemistry, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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Long-term effects of enriched environment following neonatal hypoxia-ischemia on behavior, BDNF and synaptophysin levels in rat hippocampus: Effect of combined treatment with G-CSF. Brain Res 2017; 1667:55-67. [DOI: 10.1016/j.brainres.2017.05.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Revised: 04/13/2017] [Accepted: 05/01/2017] [Indexed: 12/12/2022]
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L-Carnitine and Acetyl-L-carnitine Roles and Neuroprotection in Developing Brain. Neurochem Res 2017; 42:1661-1675. [PMID: 28508995 DOI: 10.1007/s11064-017-2288-7] [Citation(s) in RCA: 169] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Revised: 04/27/2017] [Accepted: 04/28/2017] [Indexed: 12/30/2022]
Abstract
L-Carnitine functions to transport long chain fatty acyl-CoAs into the mitochondria for degradation by β-oxidation. Treatment with L-carnitine can ameliorate metabolic imbalances in many inborn errors of metabolism. In recent years there has been considerable interest in the therapeutic potential of L-carnitine and its acetylated derivative acetyl-L-carnitine (ALCAR) for neuroprotection in a number of disorders including hypoxia-ischemia, traumatic brain injury, Alzheimer's disease and in conditions leading to central or peripheral nervous system injury. There is compelling evidence from preclinical studies that L-carnitine and ALCAR can improve energy status, decrease oxidative stress and prevent subsequent cell death in models of adult, neonatal and pediatric brain injury. ALCAR can provide an acetyl moiety that can be oxidized for energy, used as a precursor for acetylcholine, or incorporated into glutamate, glutamine and GABA, or into lipids for myelination and cell growth. Administration of ALCAR after brain injury in rat pups improved long-term functional outcomes, including memory. Additional studies are needed to better explore the potential of L-carnitine and ALCAR for protection of developing brain as there is an urgent need for therapies that can improve outcome after neonatal and pediatric brain injury.
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Millar LJ, Shi L, Hoerder-Suabedissen A, Molnár Z. Neonatal Hypoxia Ischaemia: Mechanisms, Models, and Therapeutic Challenges. Front Cell Neurosci 2017; 11:78. [PMID: 28533743 PMCID: PMC5420571 DOI: 10.3389/fncel.2017.00078] [Citation(s) in RCA: 213] [Impact Index Per Article: 30.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Accepted: 03/07/2017] [Indexed: 12/11/2022] Open
Abstract
Neonatal hypoxia-ischaemia (HI) is the most common cause of death and disability in human neonates, and is often associated with persistent motor, sensory, and cognitive impairment. Improved intensive care technology has increased survival without preventing neurological disorder, increasing morbidity throughout the adult population. Early preventative or neuroprotective interventions have the potential to rescue brain development in neonates, yet only one therapeutic intervention is currently licensed for use in developed countries. Recent investigations of the transient cortical layer known as subplate, especially regarding subplate's secretory role, opens up a novel set of potential molecular modulators of neonatal HI injury. This review examines the biological mechanisms of human neonatal HI, discusses evidence for the relevance of subplate-secreted molecules to this condition, and evaluates available animal models. Neuroserpin, a neuronally released neuroprotective factor, is discussed as a case study for developing new potential pharmacological interventions for use post-ischaemic injury.
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Affiliation(s)
- Lancelot J. Millar
- Molnár Group, Department of Physiology, Anatomy and Genetics, University of OxfordOxford, UK
| | - Lei Shi
- Molnár Group, Department of Physiology, Anatomy and Genetics, University of OxfordOxford, UK
- JNU-HKUST Joint Laboratory for Neuroscience and Innovative Drug Research, College of Pharmacy, Jinan UniversityGuangzhou, China
| | | | - Zoltán Molnár
- Molnár Group, Department of Physiology, Anatomy and Genetics, University of OxfordOxford, UK
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Chavez-Valdez R, O’Connor M, Perin J, Reyes M, Armstrong J, Parkinson C, Gilmore M, Jennings J, Northington FJ, Lee JK. Sex-specific associations between cerebrovascular blood pressure autoregulation and cardiopulmonary injury in neonatal encephalopathy and therapeutic hypothermia. Pediatr Res 2017; 81:759-766. [PMID: 28141793 PMCID: PMC5561426 DOI: 10.1038/pr.2017.23] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 01/02/2017] [Indexed: 11/09/2022]
Abstract
BACKGROUND Cardiopulmonary injury is common in neonatal encephalopathy, but the link with cerebrovascular dysfunction is unknown. We hypothesized that alterations of cerebral autoregulation are associated with cardiopulmonary injury in neonates treated with therapeutic hypothermia (TH) for neonatal encephalopathy. METHODS The cerebral hemoglobin volume index (HVx) from near-infrared spectroscopy was used to identify the mean arterial blood pressure (MAP) with optimal autoregulatory vasoreactivity (MAPOPT). We measured associations between MAP relative to MAPOPT and indicators of cardiopulmonary injury (duration of mechanical respiratory support and administration of inhaled nitric oxide (iNO), milrinone, or steroids). RESULTS We identified associations between cerebrovascular autoregulation and cardiopulmonary injury that were often sex-specific. Greater MAP deviation above MAPOPT was associated with shorter duration of intubation in boys but longer ventilatory support in girls. Greater MAP deviation below MAPOPT related to longer intensive care stay in boys. Milrinone was associated with greater MAP deviation below MAPOPT in girls. CONCLUSION MAP deviation from MAPOPT may relate to cardiopulmonary injury after neonatal encephalopathy, and sex may modulate this relationship. Whereas MAP above MAPOPT may protect the brain and lungs in boys, it may be related to cardiopulmonary injury in girls. Future studies are needed to characterize the role of sex in these associations.
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Affiliation(s)
- Raul Chavez-Valdez
- Division of Neonatology, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD, USA
- Neurosciences Intensive Care Nursery, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Matthew O’Connor
- Division of Neonatology, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Jamie Perin
- Center for Child and Community Health Research (CCHR), Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Michael Reyes
- Department of Anesthesiology and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, MD
| | - Jillian Armstrong
- Department of Anesthesiology and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, MD
| | - Charlamaine Parkinson
- Neurosciences Intensive Care Nursery, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Maureen Gilmore
- Division of Neonatology, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Jacky Jennings
- Center for Child and Community Health Research (CCHR), Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Frances J. Northington
- Division of Neonatology, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD, USA
- Neurosciences Intensive Care Nursery, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Jennifer K. Lee
- Neurosciences Intensive Care Nursery, Johns Hopkins School of Medicine, Baltimore, MD, USA
- Department of Anesthesiology and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, MD
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Diaz J, Abiola S, Kim N, Avaritt O, Flock D, Yu J, Northington FJ, Chavez-Valdez R. Therapeutic Hypothermia Provides Variable Protection against Behavioral Deficits after Neonatal Hypoxia-Ischemia: A Potential Role for Brain-Derived Neurotrophic Factor. Dev Neurosci 2017; 39:257-272. [PMID: 28196356 DOI: 10.1159/000454949] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 12/05/2016] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Despite treatment with therapeutic hypothermia (TH), infants who survive hypoxic ischemic (HI) encephalopathy (HIE) have persistent neurological abnormalities at school age. Protection by TH against HI brain injury is variable in both humans and animal models. Our current preclinical model of hypoxia-ischemia (HI) and TH displays this variability of outcomes in neuropathological and neuroimaging end points with some sexual dimorphism. The detailed behavioral phenotype of this model is unknown. Whether there is sexual dimorphism in certain behavioral domains is also not known. Brain-derived neurotrophic factor (BDNF) supports neuronal cell survival and repair but may also be a marker of injury. Here, we characterize the behavioral deficits after HI and TH stratified by sex, as well as late changes in BDNF and its correlation with memory impairment. METHODS HI was induced in C57BL6 mice on postnatal day 10 (p10) (modified Vannucci model). Mice were randomized to TH (31°C) or normothermia (NT, 36°C) for 4 h after HI. Controls were anesthesia-exposed, age- and sex-matched littermates. Between p16 and p39, growth was followed, and behavioral testing was performed including reflexes (air righting, forelimb grasp and negative geotaxis) and sensorimotor, learning, and memory skills (open field, balance beam, adhesive removal, Y-maze tests, and object location task [OLT]). Correlations between mature BDNF levels in the forebrain and p42 memory outcomes were studied. RESULTS Both male and female HI mice had an approximately 8-12% lower growth rate (g/day) than shams (p ≤ 0.01) by p39. TH ameliorated this growth failure in females but not in males. In female mice, HI injury prolonged the time spent at the periphery (open field) at p36 (p = 0.004), regardless of treatment. TH prevented motor impairments in the balance beam and adhesive removal tests in male and female mice, respectively (p ≤ 0.05). Male and female HI mice visited the new arm of the Y-maze 12.5% (p = 0.05) and 10% (p = 0.03) less often than shams, respectively. Male HI mice also had 35% lower exploratory preference score than sham (p ≤ 0.001) in the OLT. TH did not prevent memory impairments found with Y-maze testing or OLT in either sex (p ≤ 0.01) at p26. At p42, BDNF levels in the forebrain ipsilateral to the HI insult were 1.7- to 2-fold higher than BDNF levels in the sham forebrain, and TH did not prevent this increase. Higher BDNF levels in the forebrain ipsilateral to the insult correlated with worse performance in the Y-maze in both sexes and in OLT in male mice (p = 0.01). CONCLUSIONS TH provides benefit in specific domains of behavior following neonatal HI. In general, these benefits accrued to both males and females, but not in all areas. In some domains, such as memory, no benefit of TH was found. Late differences in individual BDNF levels may explain some of these findings.
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Affiliation(s)
- Johana Diaz
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD, USA
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Sukhanova IA, Sebentsova EA, Levitskaya NG. The acute and delayed effects of perinatal hypoxic brain damage in children and in model experiments with rodents. NEUROCHEM J+ 2016. [DOI: 10.1134/s1819712416040127] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Netto CA, Sanches E, Odorcyk FK, Duran-Carabali LE, Weis SN. Sex-dependent consequences of neonatal brain hypoxia-ischemia in the rat. J Neurosci Res 2016; 95:409-421. [DOI: 10.1002/jnr.23828] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 06/14/2016] [Accepted: 06/20/2016] [Indexed: 12/25/2022]
Affiliation(s)
- Carlos Alexandre Netto
- Department of Biochemistry, Instituto de Ciências Básicas da Saúde; Universidade Federal do Rio Grande do Sul; Porto Alegre Rio Grande do Sul Brazil
| | - Eduardo Sanches
- Division of Child Development and Growth, Department of Pediatrics; University of Geneva; Geneva Switzerland
| | - Felipe Kawa Odorcyk
- Postgraduate Program of Neurosciences, Instituto de Ciências Básicas da Saúde; Universidade Federal do Rio Grande do Sul; Porto Alegre Rio Grande do Sul Brazil
| | - Luz Elena Duran-Carabali
- Postgraduate Program of Physiology, Instituto de Ciências Básicas da Saúde; Universidade Federal do Rio Grande do Sul; Porto Alegre Rio Grande do Sul Brazil
| | - Simone Nardin Weis
- Department of Cellular Biology; Universidade de Brasília; Brasilia Distrito Federal Brazil
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Rao R, Ennis K, Mitchell EP, Tran PV, Gewirtz JC. Recurrent Moderate Hypoglycemia Suppresses Brain-Derived Neurotrophic Factor Expression in the Prefrontal Cortex and Impairs Sensorimotor Gating in the Posthypoglycemic Period in Young Rats. Dev Neurosci 2016; 38:74-82. [PMID: 26820887 DOI: 10.1159/000442878] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Accepted: 11/29/2015] [Indexed: 01/04/2023] Open
Abstract
Recurrent hypoglycemia is common in infants and children. In developing rat models, recurrent moderate hypoglycemia leads to neuronal injury in the medial prefrontal cortex. To understand the effects beyond neuronal injury, 3-week-old male rats were subjected to 5 episodes of moderate hypoglycemia (blood glucose concentration, approx. 30 mg/dl for 90 min) once daily from postnatal day 24 to 28. Neuronal injury was determined using Fluoro-Jade B histochemistry on postnatal day 29. The effects on brain-derived neurotrophic factor (BDNF) and its cognate receptor, tyrosine kinase receptor B (TrkB) expression, which is critical for prefrontal cortex development, were determined on postnatal day 29 and at adulthood. The effects on prefrontal cortex-mediated function were determined by assessing the prepulse inhibition of the acoustic startle reflex on postnatal day 29 and 2 weeks later, and by testing for fear-potentiated startle at adulthood. Recurrent hypoglycemia led to neuronal injury confined primarily to the medial prefrontal cortex. BDNF/TrkB expression in the prefrontal cortex was suppressed on postnatal day 29 and was accompanied by lower prepulse inhibition, suggesting impaired sensorimotor gating. Following the cessation of recurrent hypoglycemia, the prepulse inhibition had recovered at 2 weeks. BDNF/TrkB expression in the prefrontal cortex had normalized and fear-potentiated startle was intact at adulthood. Recurrent moderate hypoglycemia during development has significant adverse effects on the prefrontal cortex in the posthypoglycemic period.
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Chavez-Valdez R, Flock DL, Martin LJ, Northington FJ. Endoplasmic reticulum pathology and stress response in neurons precede programmed necrosis after neonatal hypoxia-ischemia. Int J Dev Neurosci 2015; 48:58-70. [PMID: 26643212 DOI: 10.1016/j.ijdevneu.2015.11.007] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 11/24/2015] [Accepted: 11/24/2015] [Indexed: 11/26/2022] Open
Abstract
The endoplasmic reticulum (ER) is tasked, among many other functions, with preventing excitotoxicity from killing neurons following neonatal hypoxia-ischemia (HI). With the search for delayed therapies to treat neonatal HI, the study of delayed ER responses becomes relevant. We hypothesized that ER stress is a prominent feature of delayed neuronal death via programmed necrosis after neonatal HI. Since necrostatin-1 (Nec-1), an inhibitor of programmed necrosis, provides delayed neuroprotection against neonatal HI in male mice, Nec-1 is an ideal tool to study delayed ER responses. C57B6 male mice were exposed to right carotid ligation followed by exposure to FiO2=0.08 for 45 min at p7. Mice were treated with vehicle or Nec-1 (0.1 μl of 8 μmol) intracerebroventricularly with age-matched littermates as controls. Biochemistry assays at 3 and 24h and electron microscopy (EM) and immunohistochemistry at 96 h after HI were performed. EM showed ER dilation and mitochondrial swelling as apparent early changes in neurons. With advanced neurodegeneration, large cytoplasmic fragments containing dilated ER "shed" into the surrounding neuropil and calreticulin immunoreactivity was lost concurrent with nuclear features suggestive of programmed necrosis. Nec-1 attenuated biochemical markers of ER stress after neonatal HI, including PERK and eIF2α phosphorylation, and unconventional XBP-1 splicing, consistent with the mitigation of later ER pathology. ER pathology may be an indicator of severity of neuronal injury and potential for recovery characterized by cytoplasmic shedding, distinct from apoptotic blebbing, that we term neuronal macrozeiosis. Therapies to attenuate ER stress applied at delayed stages may rescue stressed neurons after neonatal HI.
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Affiliation(s)
- Raul Chavez-Valdez
- Department of Pediatrics, Neonatal Research Laboratory, Johns Hopkins University School of Medicine, 600 N. Wolfe Street, CMSC 6-104, Baltimore, MD 21287, USA.
| | - Debbie L Flock
- Department of Pediatrics, Neonatal Research Laboratory, Johns Hopkins University School of Medicine, 600 N. Wolfe Street, CMSC 6-104, Baltimore, MD 21287, USA.
| | - Lee J Martin
- Departments of Pathology and Neuroscience, Johns Hopkins University School of Medicine, 720 Rutland Ave. Ross Research Building, Room 558, Baltimore, MD 21205, USA.
| | - Frances J Northington
- Department of Pediatrics, Neonatal Research Laboratory, Johns Hopkins University School of Medicine, 600 N. Wolfe Street, CMSC 6-104, Baltimore, MD 21287, USA.
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Sex differences in cell genesis, hippocampal volume and behavioral outcomes in a rat model of neonatal HI. Exp Neurol 2015; 275 Pt 2:285-95. [PMID: 26376217 DOI: 10.1016/j.expneurol.2015.09.003] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Revised: 08/27/2015] [Accepted: 09/06/2015] [Indexed: 12/11/2022]
Abstract
Hypoxia-ischemia (HI) of the brain in near-term and term infants is a leading cause of infant mortality and lifelong disability but current therapeutic approaches remain limited. Males consistently display greater vulnerability to the deleterious consequences of HI in both humans and animal models. Neurogenesis increases after neonatal HI and offers a potential therapeutic target for recovery. The steroid hormone estradiol has been extensively explored as a neuroprotectant in adult models of stroke but with mixed results. Less consideration has been afforded to this naturally occurring agent in the developing brain, which has unique challenges from the adult. Using a model of term HI in the rat we have explored the impact of this insult on cell genesis in the hippocampus of males and females and the ability of estradiol treatment immediately after insult to restore function. Both short-term (3 days) and long-term (7 days) post-injury were assessed and revealed that only females had markedly increased cell genesis on the short-term but both sexes were increased long-term. A battery of behavioral tests revealed motor impairment in males and compromised episodic memory while both sexes were modestly impaired in spatial memory. Juvenile social play was also depressed in both sexes after HI. Estradiol therapy improved behavioral performance in both sexes but did not reverse a deficit in hippocampal volume ipsilateral to the insult. Thus the effects of estradiol do not appear to be via cell death or proliferation but rather involve other components of neural functioning.
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Célia Moreira Borella V, Seeman MV, Carneiro Cordeiro R, Vieira dos Santos J, Romário Matos de Souza M, Nunes de Sousa Fernandes E, Santos Monte A, Maria Mendes Vasconcelos S, Quinn JP, de Lucena DF, Carvalho AF, Macêdo D. Gender and estrous cycle influences on behavioral and neurochemical alterations in adult rats neonatally administered ketamine. Dev Neurobiol 2015. [PMID: 26215537 DOI: 10.1002/dneu.22329] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Neonatal N-methyl-D-aspartate (NMDA) receptor blockade in rodents triggers schizophrenia (SCZ)-like alterations during adult life. SCZ is influenced by gender in age of onset, premorbid functioning, and course. Estrogen, the hormone potentially driving the gender differences in SCZ, is known to present neuroprotective effects such as regulate oxidative pathways and the expression of brain-derived neurotrophic factor (BDNF). Thus, the aim of this study was to verify if differences in gender and/or estrous cycle phase during adulthood would influence the development of behavioral and neurochemical alterations in animals neonatally administered ketamine. The results showed that ketamine-treated male (KT-male) and female-in-diestrus (KTF-diestrus, the low estrogen phase) presented significant deficits in prepulse inhibition of the startle reflex and spatial working memory, two behavioral SCZ endophenotypes. On the contrary, female ketamine-treated rats during proestrus (KTF-proestrus, the high estradiol phase) had no behavioral alterations. This correlated with an oxidative imbalance in the hippocampus (HC) of both male and KTF-diestrus female rats, that is, decreased levels of GSH and increased levels of lipid peroxidation and nitrite. Similarly, BDNF was decreased in the KTF-diestrus rats while no alterations were observed in KTF-proestrus and male animals. The changes in the HC were in contrast to those in the prefrontal cortex in which only increased levels of nitrite in all groups studied were observed. Thus, there is a gender difference in the adult rat HC in response to ketamine neonatal administration, which is based on the estrous cycle. This is discussed in relation to neuropsychiatric conditions and in particular SCZ.
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Affiliation(s)
- Vládia Célia Moreira Borella
- Department of Physiology and Pharmacology, Drug Research and Development Center, Faculty of Medicine, Neuropharmacology Laboratory, Federal University of Ceara, Fortaleza, CE, Brazil
| | - Mary V Seeman
- Department of Psychiatry, University of Toronto, Toronto, Ontario, Canada
| | - Rafaela Carneiro Cordeiro
- Department of Physiology and Pharmacology, Drug Research and Development Center, Faculty of Medicine, Neuropharmacology Laboratory, Federal University of Ceara, Fortaleza, CE, Brazil
| | - Júnia Vieira dos Santos
- Department of Physiology and Pharmacology, Drug Research and Development Center, Faculty of Medicine, Neuropharmacology Laboratory, Federal University of Ceara, Fortaleza, CE, Brazil
| | - Marcos Romário Matos de Souza
- Department of Physiology and Pharmacology, Drug Research and Development Center, Faculty of Medicine, Neuropharmacology Laboratory, Federal University of Ceara, Fortaleza, CE, Brazil
| | - Ethel Nunes de Sousa Fernandes
- Department of Physiology and Pharmacology, Drug Research and Development Center, Faculty of Medicine, Neuropharmacology Laboratory, Federal University of Ceara, Fortaleza, CE, Brazil
| | - Aline Santos Monte
- Department of Physiology and Pharmacology, Drug Research and Development Center, Faculty of Medicine, Neuropharmacology Laboratory, Federal University of Ceara, Fortaleza, CE, Brazil
| | - Silvânia Maria Mendes Vasconcelos
- Department of Physiology and Pharmacology, Drug Research and Development Center, Faculty of Medicine, Neuropharmacology Laboratory, Federal University of Ceara, Fortaleza, CE, Brazil
| | - John P Quinn
- Department of Molecular and Clinical Pharmacology, Institute of Translational Medicine, University of Liverpool, Liverpool, United Kingdom
| | - David F de Lucena
- Department of Physiology and Pharmacology, Drug Research and Development Center, Faculty of Medicine, Neuropharmacology Laboratory, Federal University of Ceara, Fortaleza, CE, Brazil
| | - André F Carvalho
- Department of Clinical Medicine, Psychiatry Research Group, Faculty of Medicine, Federal University of Ceara, Fortaleza, CE, Brazil
| | - Danielle Macêdo
- Department of Physiology and Pharmacology, Drug Research and Development Center, Faculty of Medicine, Neuropharmacology Laboratory, Federal University of Ceara, Fortaleza, CE, Brazil
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Burnsed JC, Chavez-Valdez R, Hossain MS, Kesavan K, Martin LJ, Zhang J, Northington FJ. Hypoxia-ischemia and therapeutic hypothermia in the neonatal mouse brain--a longitudinal study. PLoS One 2015; 10:e0118889. [PMID: 25774892 PMCID: PMC4361713 DOI: 10.1371/journal.pone.0118889] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 01/08/2015] [Indexed: 11/22/2022] Open
Abstract
Therapeutic hypothermia is standard of care for infants with hypoxic ischemic encephalopathy. Murine models of hypoxic-ischemic injury exist; however, a well-established mouse model of therapeutic hypothermia following hypoxic-ischemic injury is lacking. The goal of this study was to develop a full-term-equivalent murine model of therapeutic hypothermia after hypoxia-ischemia and examine magnetic resonance imaging, behavior, and histology in a region and sex specific manner. Hypoxic-ischemic injury was induced at postnatal day 10 in C57BL6 mice using a modified Vannucci model. Mice were randomized to control, hypothermia (31˚C for 4h), or normothermia (36˚C) following hypoxic-ischemic injury and stratified by sex. T2-weighted magnetic resonance imaging was obtained at postnatal day 18 and 30 and regional and total cerebral and cerebellar volumes measured. Behavioral assessments were performed on postnatal day 14, 21, and 28. On postnatal day 18, normothermic mice had smaller cerebral volumes (p < 0.001 vs. controls and p = 0.009 vs. hypothermia), while at postnatal day 30 both injured groups had smaller volumes than controls. When stratified by sex, only normothermia treated male mice had smaller cerebral volumes (p = 0.001 vs. control; p = 0.008 vs. hypothermia) at postnatal day 18, which persisted at postnatal day 30 (p = 0.001 vs. control). Female mice had similar cerebral volumes between groups at both day 18 and 30. Cerebellar volumes of hypothermia treated male mice differed from control at day 18, but not at 30. Four hours of therapeutic hypothermia in this murine hypoxic-ischemic injury model provides sustained neuroprotection in the cerebrum of male mice. Due to variable degree of injury in female mice, response to therapeutic hypothermia is difficult to discern. Deficits in female behavior tests are not fully explained by imaging measures and likely represent injury not detectable by volume measurements alone.
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Affiliation(s)
- Jennifer C. Burnsed
- Division of Neonatology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Raul Chavez-Valdez
- Division of Neonatology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Mir Shanaz Hossain
- Division of Neonatology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Kalpashri Kesavan
- Division of Neonatology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Lee J. Martin
- Division of Neuropathology, Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Jiangyang Zhang
- Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Frances J. Northington
- Division of Neonatology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
- * E-mail:
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Hypoxic conditioned medium from rat cerebral cortical cells enhances the proliferation and differentiation of neural stem cells mainly through PI3-K/Akt pathways. PLoS One 2014; 9:e111938. [PMID: 25386685 PMCID: PMC4227679 DOI: 10.1371/journal.pone.0111938] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 10/01/2014] [Indexed: 01/01/2023] Open
Abstract
Purpose To investigate the effects of hypoxic conditioned media from rat cerebral cortical cells on the proliferation and differentiation of neural stem cells (NSCs) in vitro, and to study the roles of PI3-K/Akt and JNK signal transduction pathways in these processes. Methods Cerebral cortical cells from neonatal Sprague–Dawley rat were cultured under hypoxic and normoxic conditions; the supernatant was collected and named ‘hypoxic conditioned medium’ (HCM) and ‘normoxic conditioned medium’ (NCM), respectively. We detected the protein levels (by ELISA) of VEGF and BDNF in the conditioned media and mRNA levels (by RT-PCR) in cerebral cortical cells. The proliferation (number and size of neurospheres) and differentiation (proportion of neurons and astrocytes over total cells) of NSCs was assessed. LY294002 and SP600125, inhibitors of PI3-K/Akt and JNK, respectively, were applied, and the phosphorylation levels of PI3-K, Akt and JNK were measured by western blot. Results The protein levels and mRNA expressions of VEGF and BDNF in 4% HCM and 1% HCM were both higher than that of those in NCM. The efficiency and speed of NSCs proliferation was enhanced in 4% HCM compared with 1% HCM. The highest percentage of neurons and lowest percentage of astrocytes was found in 4% HCM. However, the enhancement of NSCs proliferation and differentiation into neurons accelerated by 4% HCM was inhibited by LY294002 and SP600125, with LY294002 having a stronger inhibitory effect. The increased phosphorylation levels of PI3-K, Akt and JNK in 4% HCM were blocked by LY294002 and SP600125. Conclusions 4%HCM could promote NSCs proliferation and differentiation into high percentage of neurons, these processes may be mainly through PI3-K/Akt pathways.
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Bakos J, Lestanova Z, Strbak V, Havranek T, Bacova Z. Neonatal manipulation of oxytocin prevents lipopolysaccharide-induced decrease in gene expression of growth factors in two developmental stages of the female rat. Neuropeptides 2014; 48:281-6. [PMID: 25047873 DOI: 10.1016/j.npep.2014.06.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Revised: 06/20/2014] [Accepted: 06/30/2014] [Indexed: 12/31/2022]
Abstract
Oxytocin production and secretion is important for early development of the brain. Long-term consequences of manipulation of oxytocin system might include changes in markers of brain plasticity - cytoskeletal proteins and neurotrophins. The aim of the present study was (1) to determine whether neonatal oxytocin administration affects gene expression of nestin, microtubule-associated protein-2 (MAP-2), brain derived neurotrophic factor (BDNF) and nerve growth factor (NGF) in the brain of two developmental stages of rat and (2) to evaluate whether neonatal oxytocin administration protects against lipopolysaccharide (LPS) induced inflammation. Neonatal oxytocin did not prevent a decrease of body weight in the LPS treated animals. Oxytocin significantly increased gene expression of BDNF in the right hippocampus in 21-day and 2-month old rats of both sexes. Gene expression of NGF and MAP-2 significantly increased in males treated with oxytocin. Both, growth factors and intermediate filament-nestin mRNA levels, were reduced in females exposed to LPS. Oxytocin treatment prevented a decrease in the gene expression of only growth factors. In conclusion, neonatal manipulation of oxytocin has developmental and sex-dependent effect on markers of brain plasticity. These results also indicate, that oxytocin may be protective against inflammation particularly in females.
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Affiliation(s)
- Jan Bakos
- Institute of Experimental Endocrinology, Slovak Academy of Sciences, Bratislava, Slovakia; Institute of Physiology, Medical Faculty, Comenius University, Bratislava, Slovakia.
| | - Zuzana Lestanova
- Institute of Experimental Endocrinology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Vladimir Strbak
- Institute of Experimental Endocrinology, Slovak Academy of Sciences, Bratislava, Slovakia; Department of Normal and Pathological Physiology, Medical Faculty, Slovak Medical University, Bratislava, Slovakia
| | - Tomas Havranek
- Institute of Experimental Endocrinology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Zuzana Bacova
- Institute of Experimental Endocrinology, Slovak Academy of Sciences, Bratislava, Slovakia; Department of Normal and Pathological Physiology, Medical Faculty, Slovak Medical University, Bratislava, Slovakia
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The effects of poststroke aerobic exercise on neuroplasticity: a systematic review of animal and clinical studies. Transl Stroke Res 2014; 6:13-28. [PMID: 25023134 DOI: 10.1007/s12975-014-0357-7] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Revised: 06/02/2014] [Accepted: 06/30/2014] [Indexed: 10/25/2022]
Abstract
Aerobic exercise may be a catalyst to promote neuroplasticity and recovery following stroke; however, the optimal methods to measure neuroplasticity and the effects of training parameters have not been fully elucidated. We conducted a systematic review and synthesis of clinical trials and studies in animal models to determine (1) the extent to which aerobic exercise influences poststroke markers of neuroplasticity, (2) the optimal parameters of exercise required to induce beneficial effects, and (3) consistent outcomes in animal models that could help inform the design of future trials. Synthesized findings show that forced exercise at moderate to high intensity increases brain-derived neurotrophic factor (BDNF), insulin-like growth factor-I (IGF-I), nerve growth factor (NGF), and synaptogenesis in multiple brain regions. Dendritic branching was most responsive to moderate rather than intense training. Disparity between clinical stroke and stroke models (timing of initiation of exercise, age, gender) and clinically viable methods to measure neuroplasticity are some of the areas that should be addressed in future research.
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