Abstract:
:We used in vivo microdialysis to determine the impact of a focal hypoxic-ischemic insult on hippocampal amino acid efflux in the immature brain. Microdialysis probes were inserted into the right hippocampus of postnatal d 7 rats. To induce hypoxic-ischemic injury, the right carotid artery was ligated and animals were exposed to 8% oxygen for 2 h (n = 6, histologically verified). Ten 20-min dialysis fractions were collected from each animal: three sequential 20-min baseline samples, six samples during hypoxia, and a recovery sample in room air. Eight amino acids were detected in dialysates with a HPLC assay. There was marked intra- and interanimal variation in glutamate efflux; mean glutamate efflux increased from 17 pmol/min in baseline samples to 51 in the 2nd h of hypoxia (p = 0.002, Kruskal Wallis test). There was a concurrent decline in glutamine efflux (310 to 207 pmol/min, p = 0.0005). Alanine efflux doubled during hypoxia (p = 0.015). There were no changes in efflux of the other five amino acids analyzed. In this experimental model of perinatal stroke, during the acute evolution of hypoxic-ischemic brain injury, transient large increases in glutamate efflux and corresponding declines in glutamine efflux were detected. These data support the hypothesis that synaptic concentrations of the endogenous excitatory amino acid glutamate increase during the evolution of hippocampal ischemic injury.
journal_name
Pediatr Resjournal_title
Pediatric researchauthors
Silverstein FS,Naik B,Simpson Jdoi
10.1203/00006450-199112000-00021subject
Has Abstractpub_date
1991-12-01 00:00:00pages
587-90issue
6eissn
0031-3998issn
1530-0447journal_volume
30pub_type
杂志文章abstract:BACKGROUND:Severe traumatic brain injury (TBI) is a leading cause of mortality in children, but the accurate prediction of outcomes at the point of admission remains very challenging. Admission laboratory results are a promising potential source of prognostic data, but have not been widely explored in paediatric cohort...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-019-0510-9
更新日期:2019-11-01 00:00:00
abstract::Contributions from multidisciplinary investigations have focused attention on the potential of tissue engineering to yield novel therapeutics. Congenital malformations, including cleft palate, craniosynostosis, and craniofacial skeletal hypoplasias represent excellent targets for the implementation of tissue engineeri...
journal_title:Pediatric research
pub_type: 杂志文章,评审
doi:10.1203/PDR.0b013e31816a743e
更新日期:2008-05-01 00:00:00
abstract::Two infants with disorders of propionate metabolism were studied at 7 months of age to determine optimum levels of intake of protein and calories to meet the requirements for essential amino acid for growth in infancy, and at the same time minimize the accumulation of toxic intermediates. An effect of alanine was foun...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198501000-00023
更新日期:1985-01-01 00:00:00
abstract::The mononuclear cells of newborn infants compared to those of normal adults contain diminished activity of pyruvate kinase (PK) (14.9 +/- 1.2 vs. 22.3 +/- 1.3 mumol/10(10) cells/min) and phosphoglycerate kinase (PGK) (195 +/- 10 vs. 415 +/- 19). These deficiencies are accentuated in the cells of premature infants (4.9...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-197710000-00008
更新日期:1977-10-01 00:00:00
abstract::In 1964, H. K. A. Visser and W. S. Cost were the first to suggest a defect of the terminal aldosterone (Aldo) biosynthesis in patients with hypoaldosteronism. In the last years, the molecular basis of the terminal Aldo biosynthesis has been elucidated. Aldo biosynthesis requires 11beta-hydroxylation of 11-deoxycortico...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199603000-00027
更新日期:1996-03-01 00:00:00
abstract::Most preterm infants breathe at birth, but need additional respiratory support due to immaturity of the lung and respiratory control mechanisms. To avoid lung injury, the focus of respiratory support has shifted from invasive towards non-invasive ventilation. However, applying effective non-invasive ventilation is dif...
journal_title:Pediatric research
pub_type: 杂志文章,评审
doi:10.1038/s41390-019-0468-7
更新日期:2019-06-19 00:00:00
abstract::Young adult macrosomic offspring of streptozotocin-induced mildly hyperglycemic rats exhibit accelerated growth through the first 10 wk of age. At 10 wk, oral glucose loading resulted in elevated plasma insulin and glucose concentrations compared to controls. To assess the mechanism of the abnormal glucose tolerance i...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199107000-00008
更新日期:1991-07-01 00:00:00
abstract::Jejunal biopsies obtained from 45 children referred for a variety of clinical conditions were examined histologically and by standard immunofluorescence methods. The number of plasma cells was recorded per "mucosal tissue unit". The results showed that most of the immunoglobulin A (IgA) counts in infants under 3 yr wi...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-197906000-00002
更新日期:1979-06-01 00:00:00
abstract::An association between chorioamnionitis and periventricular leukomalacia has been reported in human preterm infants. However, whether this link is causal has not been convincingly established, and the underlying molecular mechanisms remain unclear. The objective of this study was to establish a reproducible model of c...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-200006000-00009
更新日期:2000-06-01 00:00:00
abstract:INTRODUCTION:The Coulter LH780 hematology analyzer can evaluate mean neutrophil volume (MNV), conductivity (MNC), scatter (MNS), and distribution width (DW). We sought to investigate the value of volume, conductivity, and scatter (VCS) parameters in diagnosis and treatment efficacy of neonatal sepsis. RESULTS:We obser...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2011.16
更新日期:2012-01-01 00:00:00
abstract::The fetal inflammatory response has been suggested as causal in neonatal morbidity. Serial levels of circulating cytokines were evaluated in 74 infants with a mean gestational age (GA) of 27.1 wk. Pro-inflammatory [tumor necrosis factor-alpha (TNF-alpha), interferon-gamma (IFN-gamma), IL-1 beta, IL-2, IL-6, IL-8, IL-1...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000182592.76702.E8
更新日期:2005-11-01 00:00:00
abstract::Intracellular levels of cysteine (CSH) and reduced glutathione (GSH) in the kidney and liver of rats from the newborn to the adult period have been determined using a sensitive high performance liquid chromatography method. In the kidney, the intracellular level of free CSH increased 4-fold from 1 to 4 nmol/mg protein...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198711000-00025
更新日期:1987-11-01 00:00:00
abstract::The incidence and prevalence of celiac disease vary internationally. We studied the incidence of identified cases of childhood celiac disease in six Dutch provinces that cover 47.9% of the surface area and 67.6% of the total population of The Netherlands. Children with celiac disease aged 0-14 y, diagnosed from Januar...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199502000-00015
更新日期:1995-02-01 00:00:00
abstract::Prolonged unconjugated hyperbilirubinemia in infants associated with breast milk feeding is a common pediatric problem known as breast milk jaundice (BMJ). A polymorphic mutation (G71R) of bilirubin UDP-glucuronosyltransferase (UGT1A1) is a known cause of BMJ on the infantile side, but the responsible components of br...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/PDR.0b013e31822f242e
更新日期:2011-11-01 00:00:00
abstract::Whether severe hypoglycemia alone or in combination with hyperketonemia might cause deterioration of cardiac function has been controversial. Therefore, the influence of acute hypoglycemia (mean 33 mg/dL) with and without hyperketonemia (mean 1.3 and 3.3 mM) on cardiac function, substrate utilization, and myocardial h...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198912000-00002
更新日期:1989-12-01 00:00:00
abstract::Several hours after an hypoxic-ischemic injury to the developing brain, hyperemia, then seizures, edema, and infarction can develop. The roles of nitric oxide (NO) synthesis and excitotoxin accumulation during these later phases of injury are not known. The time course of extracellular levels of amino acids within the...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199605000-00008
更新日期:1996-05-01 00:00:00
abstract::Necrotizing enterocolitis (NEC) is one of the leading causes of death in neonatal intensive care units. The underlying pathophysiology of NEC is poorly defined, although there is a suggestion that bacterial agents play an important role in the process. In this study, we evaluated bacterial isolates from 17 NEC cases a...
journal_title:Pediatric research
pub_type: 临床试验,杂志文章
doi:10.1203/00006450-199407001-00021
更新日期:1994-07-01 00:00:00
abstract::A longitudinal study describes the pattern of appearance of eight primitive reflexes in a population of 47 viable extremely premature infants, beginning as early as 25 wk postconceptional age (PCA). Infants were examined weekly, from 1 wk of age until discharge from the neonatal intensive care unit. Primitive reflexes...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198612000-00018
更新日期:1986-12-01 00:00:00
abstract:BACKGROUND:The rate of accrual of muscle mass in neonates has not been assessed. We describe the D3-creatine (D3Cr) dilution method, a noninvasive assessment of muscle mass in neonates. METHODS:A total of 76 neonates >26-week-old corrected gestational age were enrolled and measured at 2-week intervals while admitted t...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-020-01122-w
更新日期:2020-09-12 00:00:00
abstract:BACKGROUND:The earliest onset of puberty had shifted downward, which may be due to the role of early growth and development factors in childhood. METHODS:All of 1575 Kindergarten Two (K2) children from Anhui province, China were followed up to elementary school. Girls (n = 342) with available data on AR and breast dev...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-020-1001-8
更新日期:2020-06-08 00:00:00
abstract::We assessed the patterns of Helicobacter pylori (H. pylori) specific maternal antibodies in maternal serum, cord blood, and milk, which might play a role in prevention of H. pylori infection because transferred to the infant. Between November 2000 and November 2001, mothers were recruited after delivery of their offsp...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000181370.67474.FD
更新日期:2005-11-01 00:00:00
abstract::Hypothermia is a frequent occurrence in newborns, and thermoregulatory management is a fundamental part of medical stabilization. Although modest reduction in brain temperature (2-3 degrees C) before ischemia provides neuroprotection in adults, the effect of modest hypothermia on immature brain has not been examined. ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:
更新日期:1994-04-01 00:00:00
abstract::Bubble continuous positive airway pressure (B-CPAP) applies small-amplitude, high-frequency oscillations in airway pressure (DeltaPaw) that may improve gas exchange in infants with respiratory disease. We developed a device, high-amplitude B-CPAP (HAB-CPAP), which provides greater DeltaPaw than B-CPAP provides. We stu...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/PDR.0b013e3181dcd580
更新日期:2010-06-01 00:00:00
abstract::This study was aimed at describing abdominal and laryngeal muscle responses to upper airway occlusion (UAO) in early life and the effect of sleep states on these responses. Twelve nonsedated, 9-26-d-old lambs were studied. We simultaneously recorded 1) airflow (pneumotachograph + face mask); 2) sleep states (electroco...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199706000-00011
更新日期:1997-06-01 00:00:00
abstract::DGCR6 is the most centromeric gene in the human DiGeorge critical region and is the only gene in the region with a second functional copy on a repeat localized more distally on chromosome 22. We isolated the chicken ortholog of DGCR6 and showed an embryonic expression pattern that is initially broad but becomes gradua...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000136151.50127.1C
更新日期:2004-09-01 00:00:00
abstract::Intrahepatic and intracerebral metabolic responses to neonatal fasting or enteric carbohydrate alimentation were investigated among newborn dogs. Pups were either fasted or given an intravenous glucose infusion (alimented) before an enteric feeding of physiologic quantities of either glucose or galactose. These pups w...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198304000-00012
更新日期:1983-04-01 00:00:00
abstract::Hypercholesterolemia is common in preterm infants administered 10% Intralipid perhaps because of excess phospholipid in plasma causing efflux of cholesterol from tissues. The purpose of this study was to determine if cholesterol synthesis (as measured by plasma lathosterol) is increased in preterm infants (23-32 wk ge...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199202000-00020
更新日期:1992-02-01 00:00:00
abstract::Aspiration is a major cause of lung disease in infants and young children. As the symptoms and signs of aspiration are not specific, the diagnosis is delayed due to a low index of suspicion and low sensitivity and specificity of the available diagnostic tests. In the present study, we evaluated the utility of microsph...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.pdr.0000176910.62067.a0
更新日期:2005-09-01 00:00:00
abstract::An Epstein-Barr virus-transformed B-cell line derived from a patient with severe combined immunodeficiency who died of a lymphoreticular malignancy has been characterized. The line derived from bone marrow cultures and designated DV-1 shows surface and cytoplasmic IgM and staining with fluorescent monoclonal antibodie...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198704000-00003
更新日期:1987-04-01 00:00:00
abstract::Four protein dietary groups of rats were used in this study, namely: 27% casein diet fed throughout gestation and lactation (group C-C); 27% gestation, 10% lactation (group C-D); 10% gestation, 27% lactation (group D-C); 10% throughout gestation and lactation (group D-D). Mean body weight of group D-D at warning was 1...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-197503000-00008
更新日期:1975-03-01 00:00:00