1
|
Loron G, Pansiot J, Olivier P, Charriaut-Marlangue C, Baud O. Inhaled Nitric Oxide Promotes Angiogenesis in the Rodent Developing Brain. Int J Mol Sci 2023; 24:ijms24065871. [PMID: 36982947 PMCID: PMC10054632 DOI: 10.3390/ijms24065871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 03/12/2023] [Accepted: 03/14/2023] [Indexed: 03/30/2023] Open
Abstract
Inhaled nitric oxide (iNO) is a therapy used in neonates with pulmonary hypertension. Some evidence of its neuroprotective properties has been reported in both mature and immature brains subjected to injury. NO is a key mediator of the VEGF pathway, and angiogenesis may be involved in the reduced vulnerability to injury of white matter and the cortex conferred by iNO. Here, we report the effect of iNO on angiogenesis in the developing brain and its potential effectors. We found that iNO promotes angiogenesis in the developing white matter and cortex during a critical window in P14 rat pups. This shift in the developmental program of brain angiogenesis was not related to a regulation of NO synthases by exogenous NO exposure, nor the VEGF pathway or other angiogenic factors. The effects of iNO on brain angiogenesis were found to be mimicked by circulating nitrate/nitrite, suggesting that these carriers may play a role in transporting NO to the brain. Finally, our data show that the soluble guanylate cyclase/cGMP signaling pathway is likely to be involved in the pro-angiogenetic effect of iNO through thrombospondin-1, a glycoprotein of the extracellular matrix, inhibiting soluble guanylate cyclase through CD42 and CD36. In conclusion, this study provides new insights into the biological basis of the effect of iNO in the developing brain.
Collapse
Affiliation(s)
- Gauthier Loron
- Service de Médecine Néonatale et de Réanimation Pédiatrique, Université de Reims Champagne-Ardenne, CReSTIC, CHU Reims, 51100 Reims, France
| | - Julien Pansiot
- Inserm, NeuroDiderot, Faculty of Medicine, Université Paris Cité, 75019 Paris, France
| | - Paul Olivier
- Inserm, NeuroDiderot, Faculty of Medicine, Université Paris Cité, 75019 Paris, France
| | | | - Olivier Baud
- Inserm, NeuroDiderot, Faculty of Medicine, Université Paris Cité, 75019 Paris, France
- Division of Neonatology and Pediatric Intensive Care, Children's University Hospital of Geneva, 1205 Geneva, Switzerland
| |
Collapse
|
2
|
Jung P, Ha E, Zhang M, Fall C, Hwang M, Taylor E, Stetkevich S, Bhanot A, Wilson CG, Figueroa JD, Obenaus A, Bragg S, Tone B, Eliamani S, Holshouser B, Blood AB, Liu T. Neuroprotective role of nitric oxide inhalation and nitrite in a Neonatal Rat Model of Hypoxic-Ischemic Injury. PLoS One 2022; 17:e0268282. [PMID: 35544542 PMCID: PMC9094545 DOI: 10.1371/journal.pone.0268282] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Accepted: 04/26/2022] [Indexed: 12/01/2022] Open
Abstract
Background There is evidence from various models of hypoxic-ischemic injury (HII) that nitric oxide (NO) is protective. We hypothesized that either inhaled NO (iNO) or nitrite would alleviate brain injury in neonatal HII via modulation of mitochondrial function. Methods We tested the effects of iNO and nitrite on the Rice-Vannucci model of HII in 7-day-old rats. Brain mitochondria were isolated for flow cytometry, aconitase activity, electron paramagnetic resonance, and Seahorse assays. Results Pretreatment of pups with iNO decreased survival in the Rice-Vannucci model of HII, while iNO administered post-insult did not. MRI analysis demonstrated that pre-HII iNO at 40 ppm and post-HII iNO at 20 ppm decreased the brain lesion sizes from 6.3±1.3% to 1.0±0.4% and 1.8±0.8%, respectively. Intraperitoneal nitrite at 0.165 μg/g improved neurobehavioral performance but was harmful at higher doses and had no effect on brain infarct size. NO reacted with complex IV at the heme a3 site, decreased the oxidative stress of mitochondria challenged with anoxia and reoxygenation, and suppressed mitochondrial oxygen respiration. Conclusions This study suggests that iNO administered following neonatal HII may be neuroprotective, possibly via its modulation of mitochondrial function.
Collapse
Affiliation(s)
- Peter Jung
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Euntaik Ha
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Meijuan Zhang
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Carolyn Fall
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Mindy Hwang
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Emily Taylor
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Samuel Stetkevich
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Aditi Bhanot
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Christopher G. Wilson
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
- Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Johnny D. Figueroa
- Center for Health Disparities and Molecular Medicine, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Andre Obenaus
- Department of Pediatrics, School of Medicine, University of California, Irvine, CA, United States of America
| | - Shannon Bragg
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Beatriz Tone
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Saburi Eliamani
- Center for Imaging Research, Department of Radiology, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Barbara Holshouser
- Center for Imaging Research, Department of Radiology, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Arlin B. Blood
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
- Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
| | - Taiming Liu
- Division of Neonatology, Department of Pediatrics, Loma Linda University School of Medicine, Loma Linda, CA, United States of America
- * E-mail:
| |
Collapse
|
3
|
Galdino GS, Xavier CH, Almeida R, Silva G, Fontes MA, Menezes G, Duarte ID, Perez AC. The Nitric oxide/CGMP/KATP pathway mediates systemic and central antinociception induced by resistance exercise in rats. Int J Neurosci 2014; 125:765-73. [PMID: 25271801 DOI: 10.3109/00207454.2014.970256] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Resistance exercise (RE) is characterized to increase strength, tone, mass, and/or muscular endurance and also for produces many beneficial effects, such as blood pressure and osteoporosis reduction, diabetes mellitus control, and analgesia. However, few studies have investigated endogenous mechanisms involved in the RE-induced analgesia. Thus, the aim of this study was evaluate the role of the NO/CGMP/KATP pathway in the antinociception induced by RE. Wistar rats were submitted to acute RE in a weight-lifting model. The nociceptive threshold was measured by mechanical nociceptive test (paw-withdrawal). To investigate the involvement of the NO/CGMP/KATP pathway the following nitric oxide synthase (NOS) non-specific and specific inhibitors were used: N-nitro-l-arginine (NOArg), Aminoguanidine, N5-(1-Iminoethyl)-l-ornithine dihydrocloride (l-NIO), Nω-Propyl-l-arginine (l-NPA); guanylyl cyclase inhibitor, 1H-[1,2,4]oxidiazolo[4,3-a]quinoxalin-1-one (ODQ); and KATP channel blocker, Glybenclamide; all administered subcutaneously, intrathecally and intracerebroventricularly. Plasma and cerebrospinal fluid (CSF) nitrite levels were determined by spectrophotometry. The RE protocol produced antinociception, which was significantly reversed by NOS specific and unspecific inhibitors, guanylyl cyclase inhibitor (ODQ) and KATP channel blocker (Glybenclamide). RE was also responsible for increasing nitrite levels in both plasma and CSF. These finding suggest that the NO/CGMP/KATP pathway participates in antinociception induced by RE.
Collapse
Affiliation(s)
- Giovane S Galdino
- a Department of Pharmacology , Federal University of Minas Gerais , Belo Horizonte , Brazil
| | | | | | | | | | | | | | | |
Collapse
|
4
|
Dietary nitrate supplementation improves reaction time in type 2 diabetes: Development and application of a novel nitrate-depleted beetroot juice placebo. Nitric Oxide 2014; 40:67-74. [DOI: 10.1016/j.niox.2014.05.003] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Revised: 05/12/2014] [Accepted: 05/13/2014] [Indexed: 01/08/2023]
|
5
|
Barrett RD, Bennet L, Blood AB, Wassink G, Gunn AJ. Asphyxia and therapeutic hypothermia modulate plasma nitrite concentrations and carotid vascular resistance in preterm fetal sheep. Reprod Sci 2014; 21:1483-91. [PMID: 24740991 DOI: 10.1177/1933719114530187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In this study, we tested the hypothesis that cerebral hypoperfusion after asphyxia and induced hypothermia is associated with reduced circulating nitrite levels as an index of nitric oxide synthase (NOS) activity. The preterm fetal sheep at 0.7 gestation (103-104 days, term = 147 days) received 25-minute umbilical cord occlusion, followed by mild whole-body cooling from 30 minutes to 72 hours after occlusion. Occlusion and induced hypothermia were independently associated with reduced carotid vascular conductance (CaVC) from 2 to 72 hours, and with transiently suppressed plasma nitrite levels at 6 hours. There was a significant within-subjects correlation (r(2) = 0.33, P = .002) between CaVC and plasma nitrite values in the first 24 hours after occlusion but not after sham occlusion. These findings suggest that in preterm fetal sheep, changes in NOS activity are an important mediator of changes in carotid vascular tone in the early recovery phase after asphyxia and may help mediate some of the vascular effects of induced hypothermia.
Collapse
Affiliation(s)
- Robert D Barrett
- Department of Physiology, University of Auckland, Auckland, New Zealand
| | - Laura Bennet
- Department of Physiology, University of Auckland, Auckland, New Zealand
| | - Arlin B Blood
- Department of Pediatrics and Center for Perinatal Biology, Division of Neonatology, Loma Linda University School of Medicine, Loma Linda, CA, USA
| | - Guido Wassink
- Department of Physiology, University of Auckland, Auckland, New Zealand
| | - Alistair J Gunn
- Department of Physiology, University of Auckland, Auckland, New Zealand
| |
Collapse
|
6
|
Jones JA, Ninnis JR, Hopper AO, Ibrahim Y, Merritt TA, Wan KW, Power GG, Blood AB. Nitrite and nitrate concentrations and metabolism in breast milk, infant formula, and parenteral nutrition. JPEN J Parenter Enteral Nutr 2013; 38:856-66. [PMID: 23894175 DOI: 10.1177/0148607113496118] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Dietary nitrate and nitrite are sources of gastric NO, which modulates blood flow, mucus production, and microbial flora. However, the intake and importance of these anions in infants is largely unknown. Nitrate and nitrite levels were measured in breast milk of mothers of preterm and term infants, infant formulas, and parenteral nutrition. Nitrite metabolism in breast milk was measured after freeze-thawing, at different temperatures, varying oxygen tensions, and after inhibition of potential nitrite-metabolizing enzymes. Nitrite concentrations averaged 0.07 ± 0.01 μM in milk of mothers of preterm infants, less than that of term infants (0.13 ± 0.02 μM) (P < .01). Nitrate concentrations averaged 13.6 ± 3.7 μM and 12.7 ± 4.9 μM, respectively. Nitrite and nitrate concentrations in infant formulas varied from undetectable to many-fold more than breast milk. Concentrations in parenteral nutrition were equivalent to or lower than those of breast milk. Freeze-thawing decreased nitrite concentration ~64%, falling with a half-life of 32 minutes at 37°C. The disappearance of nitrite was oxygen-dependent and prevented by ferricyanide and 3 inhibitors of lactoperoxidase. Nitrite concentrations in breast milk decrease with storage and freeze-thawing, a decline likely mediated by lactoperoxidase. Compared to adults, infants ingest relatively little nitrite and nitrate, which may be of importance in the modulation of blood flow and the bacterial flora of the infant GI tract, especially given the protective effects of swallowed nitrite.
Collapse
Affiliation(s)
| | - Janet R Ninnis
- Department of Pediatrics, Division of Neonatology Posthumous
| | | | | | - T Allen Merritt
- Department of Pediatrics, Division of Neonatology Poznan University of Medical Sciences, Poznan, Poland
| | - Kim-Wah Wan
- Neonatal Intensive Care Pharmacy, Loma Linda University, Loma Linda, California
| | | | - Arlin B Blood
- Department of Pediatrics, Division of Neonatology Center for Perinatal Biology
| |
Collapse
|
7
|
Abstract
Translational research on endogenous gaseous mediators--nitric oxide, carbon monoxide, and hydrogen sulfide--has exploded over the past decade. Drugs that modulate either the gaseous mediators themselves or their related intracellular signaling pathways are already in use in the clinics, and still more are being tested in preclinical models and clinical trials. Discussed here are the chemical and pharmacological properties that present challenges for the translation of these potentially toxic molecules.
Collapse
Affiliation(s)
- Csaba Szabo
- Department of Anesthesiology, The University of Texas Medical Branch, Galveston, TX 77555-1102, USA.
| |
Collapse
|
8
|
Bennet L, Cowie RV, Stone PR, Barrett R, Naylor AS, Blood AB, Gunn AJ. The neural and vascular effects of killed Su-Streptococcus pyogenes (OK-432) in preterm fetal sheep. Am J Physiol Regul Integr Comp Physiol 2010; 299:R664-72. [PMID: 20484698 DOI: 10.1152/ajpregu.00116.2010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Fetal exposure to inflammatory mediators is associated with a greater risk of brain injury and may cause endothelial dysfunction; however, nearly all the evidence is derived from gram-negative bacteria. Intrapleural injections of OK-432, a killed Su-strain of Streptococcus pyogenes, has been used to treat fetal chylothorax. In this study, we evaluated the neural and cardiovascular effects of OK-432 in preterm fetal sheep (104 +/- 1 days, term 147 days). OK-432 (0.1 mg, n = 6) or saline vehicle (n = 7) was infused in the fetal pleura, and fetuses were monitored for 7 days. Blood samples were taken routinely for plasma nitrite measurement. Fetal brains were taken for histological assessment at the end of the experiment. Between 3 and 7 h postinjection, OK-432 administration was associated with transient suppression of fetal body and breathing movements and electtroencephalogram activity (P < 0.05), increased carotid and femoral vascular resistance (P < 0.05), but no change in blood pressure. Brain activity and behavior then returned to normal except in one fetus that developed seizures. OK-432 fetuses showed progressive, sustained vasodilatation (P < 0.05), with lower blood pressure after 4 days (P < 0.05), but normal heart rate. There were no changes in plasma nitrite levels. Histological studies showed bilateral infarction in the dorsal limb of the hippocampus of the fetus that developed seizures, but no injury in other fetuses. We conclude that a single low-dose injection of OK-432 can be associated with risk of focal cerebral injury in the preterm fetus and chronic central and peripheral vasodilatation that does not appear to be mediated by nitric oxide.
Collapse
Affiliation(s)
- L Bennet
- Department of Physiology, The University of Auckland, New Zealand.
| | | | | | | | | | | | | |
Collapse
|