Abstract:
:Endothelin-1 can cause pulmonary vasoconstriction via endothelin-A (ET(A)) receptor activation. We hypothesized that ET(A) blockers (EMD 122946 and BQ 610) would reduce hypoxia-induced (HYP) but not group B streptococcal infusion (GBS)-induced pulmonary hypertension in a juvenile whole animal model. Pulmonary hypertension was created by exposing chronically instrumented piglets to HYP (n = 12) or heat-killed GBS (n = 11). ET(A) blockade was produced by increasing bolus doses of EMD122946 or BQ 610. Pulmonary arterial pressure (PAP), systemic arterial pressure (SAP), left atrial pressure, central venous pressure, and cardiac output were continuously measured. Pulmonary and systemic vascular resistance indices (PVRI and SVRI) were calculated. HYP doubled PAP and PVRI. Both ET(A) blockers decreased PAP and PVRI in a dose-dependent manner in HYP, with high doses decreasing PVRI to baseline and reducing PAP by 50%. GBS also doubled both PAP and PVRI. EMD 122946 did not change PAP or PVRI in GBS, although BQ 610 markedly increased PVRI (>100% increase with 0.15 mg/kg) and showed a trend toward increasing PAP. Both models showed minimal (<25%) changes in SAP or SVRI. Neither ETA blocker changed baseline hemodynamics in the absence of HYP or GBS. PaO(2) did not change with GBS but decreased with BQ 610. ET(A) receptor blockade attenuated hypoxic, but not GBS induced pulmonary hypertension. BQ 610 worsened PVRI and oxygenation in the GBS model. Differences in response to ET(A) blockade in pulmonary hypertension may be seen depending on the etiology (hypoxia versus infection-associated), and the specific ET(A) antagonist used.
journal_name
Pediatr Resjournal_title
Pediatric researchauthors
Ambalavanan N,Philips JB 3rd,Bulger A,Oparil S,Chen YFdoi
10.1203/00006450-200212000-00017subject
Has Abstractpub_date
2002-12-01 00:00:00pages
913-21issue
6eissn
0031-3998issn
1530-0447journal_volume
52pub_type
杂志文章abstract::The present study employed an animal model in an attempt to document effects on brain growth of long-term exposure to theophylline in the presence or absence of malnutrition. One group of dams was randomly divided into half. One-half was fed a 20% protein diet and the other half a 6% protein diet. Similarly, a second ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198406000-00014
更新日期:1984-06-01 00:00:00
abstract::The purpose of this study was to determine the effect of chest wall distortion on esophageal manometry by measuring simultaneous esophageal pressure changes at two sites in preterm infants. Fourteen infants were studied (mean +/- SD; birth weight, 1340 +/- 260 g; age, 8.5 +/- 4 d). Esophageal pressure was measured thr...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199505000-00010
更新日期:1995-05-01 00:00:00
abstract::Insulin is a potent mitogen for many cell types in vitro. During tissue culture, supraphysiological concentrations of insulin are necessary to promote cell replication in connective or musculoskeletal tissues. Insulin promotes the growth of these cells by binding, with low affinity, to the type I insulin-like growth f...
journal_title:Pediatric research
pub_type: 杂志文章,评审
doi:10.1203/00006450-198509000-00001
更新日期:1985-09-01 00:00:00
abstract::Data are scant regarding the development of cerebrovascular autoregulation in intrauterine growth-restricted (IUGR) newborns. We tested the hypothesis that IUGR improves the ability of neonates to withstand critical periods of gradual hemorrhagic hypotension by optimizing cerebrovascular autoregulation. Studies were c...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000139425.94975.77
更新日期:2004-10-01 00:00:00
abstract::Early nutrition in animals affects both behavior and brain structure. In humans, randomized trials show that early nutrition affects later cognition, notably in males. We hypothesized that early nutrition also influences brain structure, measurable using magnetic resonance imaging. Prior research suggested that the ca...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/PDR.0b013e318163a271
更新日期:2008-03-01 00:00:00
abstract::The purpose of the present study was to determine if autoregulation of cerebral blood flow (CBF) is present in the preterm fetal lamb and, if present, to measure the range of mean arterial blood pressure over which autoregulation exists. Thirty-seven measurements of CBF were made in seven preterm fetal lambs (118-122 ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198502000-00001
更新日期:1985-02-01 00:00:00
abstract::It is increasingly recognized that the abnormal physiologic consequences of pulmonary hypertension (PH) may contribute to poor cardiopulmonary health in premature babies. Conflicting literature has led to clinical uncertainty, pathological misinterpretation, and variability in treatment approaches among practitioners....
journal_title:Pediatric research
pub_type: 杂志文章,评审
doi:10.1038/pr.2017.200
更新日期:2017-12-01 00:00:00
abstract::To examine uridine diphosphate hexose (UDPhexose) content of cells that have more complete metabolic patterns than erythrocytes, which have been commonly used in the study of galactosemia, the concentrations of uridine diphosphate galactose (UDPgalactose) and uridine diphosphate glucose (UDPglucose) were determined in...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199411000-00014
更新日期:1994-11-01 00:00:00
abstract:BACKGROUND:Postnatal glucocorticoid therapy in the treatment of chronic lung disease benefits lung function, however it adversely affects brain development. We hypothesized that combined postnatal glucocorticoid and statin therapy diminishes adverse effects of glucocorticoids on the developing brain. METHODS:On postna...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2013.152
更新日期:2013-12-01 00:00:00
abstract::A study using fractional clearances during orally induced water diuresis was designed to delineate the mechanism underlying defective tubular reabsorption of sodium in very low-birth-weight neonates. The use of clearance methodology during maximal water diuresis may give an indirect estimate of distal sodium delivery ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198312000-00017
更新日期:1983-12-01 00:00:00
abstract::Inhibition of Pseudomonas cepacia (but not Pseudomonas aeruginosa) by beta-lactams was decreased in 5% CO2 in air compared with air alone. The effect of CO2 and pH (range, 6.0 to 8.0) on beta-lactam susceptibility, beta-lactamase expression, and outer membrane proteins was studied in isolates recovered from the sputum...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199403000-00003
更新日期:1994-03-01 00:00:00
abstract::Depression is one of the most debilitating chronic disorders in the United States, affecting 15 million children in homes with depressed mothers, many of whom endure household chaos, inconsistent nurturing, inadequate safety practices, and harsh discipline. Depressed mothers are under diagnosed and undertreated, yet t...
journal_title:Pediatric research
pub_type: 杂志文章,评审
doi:10.1038/pr.2015.214
更新日期:2016-01-01 00:00:00
abstract::Alveolar hypoxia increases pulmonary artery pressure in lambs and sheep but increases lung lymph flow only in lambs; the reasons for this are unknown. To test the hypothesis that hypoxia-induced pulmonary venous constriction could in part explain the fluid filtration response in young lambs, eight young lambs (13 +/- ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198712000-00013
更新日期:1987-12-01 00:00:00
abstract::This study determines the inotropic effects of prostaglandin D2 (PGD2) and prostaglandin E1 (PGE1) in the isolated, arterial perfused newborn (NB) and adult (A) rabbit heart. Significant positive inotropism of PGD2 was observed at all concentrations studied (1 X 10(-17) to 1 X 10(-7) M) in the two age groups; the effe...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198412000-00010
更新日期:1984-12-01 00:00:00
abstract::We examined adult sheep lymphocytes for the following surface markers: Surface membrane immunoglobulin, antigen identified by anti-sheep thymocyte globulin and complement receptors. We quantitated sheep peripheral blood mononuclear leukocyte proliferative responses to mitogens and alloantigens, and demonstrated a neut...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198405000-00012
更新日期:1984-05-01 00:00:00
abstract::BackgroundLactoferrin (LTF) could play a beneficial role in insulin resistance and diabetes, but the association of its gene variants with cardio-metabolic disorders in children has not been investigated. This study aimed to examine the relationship between LTF variants, plasma LTF concentrations, and cardio-metabolic...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2017.72
更新日期:2017-11-01 00:00:00
abstract::Clinical studies have suggested that the early stages of bilirubin encephalopathy are reversible. These phenomena are investigated at the cellular level using the neuroblastoma cell line N-115 as a model system. To determine whether the cell line N-115 can recover from bilirubin toxicity, and whether the cellular func...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198904000-00012
更新日期:1989-04-01 00:00:00
abstract::Plasma selenium concentration and glutathione peroxidase activity in red blood cells were determined in subjects from different age groups. The selenium level (mean +/- SD) found in infancy (0 to 6 months) was 2 +/- 0.6 micrograms/dl, with the lowest value of 1 microgram/dl observed in a 4-month-old infant. These leve...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198606000-00021
更新日期:1986-06-01 00:00:00
abstract:BACKGROUND:Cardiovascular instability immediately after birth is associated with intraventricular hemorrhage (IVH) in very-low-birth-weight (VLBW) infants. For circulatory management, evaluation of organ blood flow is important. In this study, the relationship between peripheral perfusion within 48 h after birth and IV...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2013.215
更新日期:2014-02-01 00:00:00
abstract:BACKGROUND:Early identification of infants at risk for complications from patent ductus arteriosus (PDA) may improve treatment outcomes. The aim of this study was to identify biochemical markers associated with persistence of PDA, and with failure of pharmacological treatment for PDA, in extremely preterm infants. MET...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-018-0182-x
更新日期:2019-09-01 00:00:00
abstract:BACKGROUND:Staphylococcus epidermidis (SE) is an important cause of late-onset sepsis in neonates. SE frequently produces a polysaccharide intercellular adhesin (PIA) biofilm, important in the pathogenesis of these infections. Little is known about how the neonatal innate immune system reacts to SE biofilm-associated i...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2012.193
更新日期:2013-03-01 00:00:00
abstract::Previous studies suggest that the endotoxin lipopolysaccharide (LPS) may have dual effects on brain damage induced by hypoxia-ischemia (HI) in 7-d-old rats, depending on the exposure paradigm. Although a 4-h interval between LPS administration and HI results in sensitization to HI brain injury, tolerance is observed w...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.pdr.0000191140.87314.ce
更新日期:2006-01-01 00:00:00
abstract::Television viewing (TVV) is considered a contributing factor to the development of childhood obesity yet it is unclear whether obesity results, in part, from increased energy intake during TVV. The objective of this study was to determine the effect of TVV on food intake (FI) of boys at a meal and its effect on calori...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/pdr.0b013e3180536591
更新日期:2007-06-01 00:00:00
abstract:BACKGROUND:Bicuspid aortic valve (BAV) is the most common type of congenital heart disease (CHD) and has a proposed genetic etiology. BAV is categorized by cusp fusion, with right-left (R-L) cusp fusion being associated with additional CHD, and right-noncoronary cusp (R-NC) fusion being associated with aortic valve dys...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2014.67
更新日期:2014-08-01 00:00:00
abstract:INTRODUCTION:Corticosteroids have been widely used in clinical medicine as a first-line therapy to modify the inflammatory response in many pulmonary and systemic diseases. Inhaled and intratracheally administered corticosteroids have a particular interest in that their use allows the clinician to circumvent systemic s...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2011.78
更新日期:2012-04-01 00:00:00
abstract::To investigate the difference in ventilatory response to exercise between children and young adults, we administered a treadmill progressive exercise test to seven boys (aged 8 to 11 y [group A]) and six male young adults (aged 14 to 21 y [group B]), who had a history of Kawasaki disease without significant coronary a...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199903000-00017
更新日期:1999-03-01 00:00:00
abstract::Alterations in thermoregulatory mechanisms related to sleep state may play an important role in the problems of homeostasis experienced by the premature infant. In the adult, homeothermic regulation of body temperature may be suspended during REM. We measured oxygen consumption (VO2) in six premature infants 33-35 wk ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198207000-00002
更新日期:1982-07-01 00:00:00
abstract:BACKGROUND:Clinicians could modify dietary interventions during early infancy by monitoring fat and fat-free mass accretion in very preterm infants. METHODS:Preterm infants were randomly assigned to either having reports on infant body composition available to the clinicians caring for them (intervention group) or not...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-020-1052-x
更新日期:2020-11-01 00:00:00
abstract::Children with cystic fibrosis excreted elevated urinary levels of all three polyamines--putrescine, spermidine, and spermine. Heterozygote parents excreted intermediate concentrations of the polyamines, but not levels significantly different from levels in normal controls. Patients with cystic fibrosis who were admini...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-197910000-00011
更新日期:1979-10-01 00:00:00
abstract::Skin fibroblasts derived from 6 patients with cystic fibrosis (CF), 1-6 months old, and from 6 age matched donors were investigated for their ability to accumulate cyclic adenosine 3':5'-monophosphate (c-AMP) in response to isoproterenol and prostaglandin E1 (PGE1) using strictly defined culture conditions. In order t...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198003000-00018
更新日期:1980-03-01 00:00:00