Abstract:
:Lung infections are a common cause of morbidity and mortality in neonates. To evaluate neonatal lung defenses against pneumococci, we challenged rats with aerosols of encapsulated pneumococci in an airborne infection apparatus. Whereas adult rats cleared greater than 95% of inhaled type 1 or type 25 pneumococci within 4 h, pneumococci proliferated in the lungs of newborn rats and reached 200-600% of the baseline value by 4 h and 1000-1700% by 24 h. As neonatal rats matured, their ability to clear inhaled pneumococci improved, but compared with adults some impairment in clearance was present until approximately 4 wk of age. Newborn rats had significantly fewer resident alveolar macrophages per g of lung tissue than did adults (p less than 0.001). Although the number of resident macrophages increased with time, a significant deficit in alveolar macrophages persisted for the first 3 wk of life (p less than 0.01). Aerosols of pneumococci caused an influx of granulocytes into the lungs of adult rats within 4 h, compared with 24 h for neonatal rats. Even at 24 h after pneumococcal challenge, newborn rats had significantly fewer granulocytes per g of lung tissue (p less than 0.05) than did adults, although 7-day-old rats had reached an adult level by this time. Significant (p less than 0.05) increases in granulocyte chemotactic activity were observed in lavage fluids of adult, but not newborn, rats after pneumococcal challenge. Thus, impaired clearance of pneumococcal aerosols by neonatal rats was associated with an age-dependent deficiency in numbers of resident alveolar macrophages and impaired generation of chemotactic activity and recruitment of granulocytes to the lung.
journal_name
Pediatr Resjournal_title
Pediatric researchauthors
Coonrod JD,Jarrells MC,Bridges RBdoi
10.1203/00006450-198712000-00025subject
Has Abstractpub_date
1987-12-01 00:00:00pages
736-42issue
6eissn
0031-3998issn
1530-0447journal_volume
22pub_type
杂志文章abstract::Small bowel resection decreases brush border membrane (BBM) glucose uptake kinetics. Oral epidermal growth factor (EGF) returns net glucose transport across intact tissue to control levels despite persistence of a defect in BBM glucose uptake. The purpose of this study was to examine the effects of resection and EGF t...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000098500.94041.9B
更新日期:2004-01-01 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::The use of nebulized racemic epinephrine to improve ventilatory function in the newborn postextubation was studied. Forty-five infants intubated for more than 3 days were randomized to receive racemic epinephrine by nebulization immediately postextubation or to receive only warmed, humidified gas. Measurements of air ...
journal_title:Pediatric research
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1203/00006450-198704000-00012
更新日期:1987-04-01 00:00:00
abstract:BACKGROUND:Children born preterm, especially boys, are at increased risk of developing attention deficit hyperactivity disorder (ADHD) and learning difficulties. We propose that neurosteroid-replacement therapy with ganaxolone (GNX) following preterm birth may mitigate preterm-associated neurodevelopmental impairment. ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-018-0185-7
更新日期:2019-01-01 00:00:00
abstract::The hypoxanthine concentration in plasma was found to be a sensitive parameter of hypoxia of the fetus and the newborn infant. The plasma level of hypoxanthine in the umbilical cord in 29 newborn infants with normal delivery varied between 0 and 11.0 mumol/liter with a mean of 5.8 mumol/liter, SD 3.0 mumol/liter. Comp...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-197504000-00002
更新日期:1975-04-01 00:00:00
abstract::Altered pulmonary vascular resistance might be a factor for delayed closure of the ductus arteriosus (DA) in preterm infants. Angiotensin II plays a central role in the elevation of pulmonary vascular resistance. Angiotensin II exerts its vasoconstrictor effect on the angiotensin II type 1 receptor (AT1R). Homozygous ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000088016.67117.39
更新日期:2003-11-01 00:00:00
abstract::The mechanism by which dexamethasone (DEX) inhibits neutrophil (PMN) recruitment to a site of inflammation, such as the newborn lung with bronchopulmonary dysplasia, is not completely understood. The aim of our study was to determine whether DEX inhibits neutrophil-induced neutrophil recruitment by inhibition of inter...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199910000-00008
更新日期:1999-10-01 00:00:00
abstract::Tracheal epithelial cells obtained from adult and infant ferrets were grown in primary culture in vitro. Cells from adult animals grew readily, and many ciliated cells were observed in the cultures. Successful cultures were derived from infant animals, but cell number in infant and adult cultures began to decrease aft...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199107000-00016
更新日期:1991-07-01 00:00:00
abstract::Studies were conducted to assess the efficacy and safety of a synthetic peptide-containing surfactant in the treatment of respiratory distress syndrome (RDS) in preterm (approximately 80% of normal gestation) infant rhesus monkeys. Surfactant was prepared consisting of the phospholipids dipalmitoylphosphatidyl choline...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199604000-00025
更新日期:1996-04-01 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::BackgroundThe mechanisms underlying aberrant activation of intestinal Toll-like receptor 4 (TLR4) signaling in necrotizing enterocolitis (NEC) remain unclear. In this study, we examined the role of single-immunoglobulin interleukin-1 receptor-related molecule (SIGIRR), an inhibitor of TLR signaling, in modulating expe...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2017.211
更新日期:2018-01-01 00:00:00
abstract::WT1 is located on the short arm of human chromosome 11 and consists of 10 coding exons. Mutations of this gene have been reported to be the cause of Wilms' tumor, congenital male genitourinary malformations, and/or renal disorders. We describe here a novel WT1 gene mutation, i.e. a point mutation at intron 7 (+2) in b...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-200109000-00008
更新日期:2001-09-01 00:00:00
abstract::Children with inflammatory bowel disease are known to be at risk of osteopenia. The cause of this osteopenia is likely to be multifactorial, but the inflammatory process with its characteristic overproduction of cytokines has been implicated. To investigate this possible contribution of the disease activity to the dev...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-200008000-00008
更新日期:2000-08-01 00:00:00
abstract::Primary immunodeficiencies (PIDs) have traditionally been defined according to their immunologic phenotype. Far from being concluded, the search for human genes that, when mutated, cause PID is actively being pursued. During the last year, four novel genetic defects that cause severe combined immunodeficiency and seve...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/PDR.0b013e31819dbe1e
更新日期:2009-05-01 00:00:00
abstract::The primary manifestations of Pompe disease are muscle weakness and cardiomyopathy. Although accumulation of glycogen has also been seen in the nervous system in patients, the significance of brain involvement in infantile-onset Pompe disease is not clear. In this study, brain development in five cases of infantile-on...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.pdr.0000233014.84318.4e
更新日期:2006-09-01 00:00:00
abstract:BACKGROUND:Exposure to inflammation exacerbates injury in neonatal encephalopathy (NE). We hypothesized that brain biomarker mRNA, cytokine mRNA and microRNA differentiate inflammation (E. coli LPS), hypoxia (Hypoxia), and inflammation-sensitized hypoxia (LPS+Hypoxia) in an NE piglet model. METHODS:Sixteen piglets wer...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/s41390-020-0986-3
更新日期:2020-06-10 00:00:00
abstract::Infants dying with bronchopulmonary dysplasia (BPD) demonstrate increased numbers of pulmonary neuroendocrine cells (PNEC). These infants also possess altered airway epithelial and smooth muscle dimensions reminiscent of oxygen-exposed animals. Because the pathogenesis of BPD involves oxygen toxicity, we hypothesized ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199710000-00020
更新日期:1997-10-01 00:00:00
abstract::The two pathways of de novo lecithin synthesis, choline incorporation (I) and phosphatidylethanolamine methylation (II), were examined in lung slices from rhesus monkey fetuses throughout the last half of gestation. Incorporation rates of pathway-specific radioactive precursors were used as a measure of lecithin produ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-197508000-00009
更新日期:1975-08-01 00:00:00
abstract::We studied the effects of a diet that was low in fat, high in carbohydrate (CHO) on milk lipid composition and de novo endogenous fatty acid synthesis by the mammary gland in five lactating women. The women consumed either a low fat (LF) (5% fat, 80% CHO) diet or a high fat (HF) (40% fat, 45% CHO) diet. Fat synthesis ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198901000-00015
更新日期:1989-01-01 00:00:00
abstract::Rats were fed a 50% galactose diet during pregnancy and nursing, and the testes were later examined and hormone levels determined in male offspring. Exposure to galactose for various periods during pregnancy, throughout the entire gestation, or postnatally to nursing mother until pups were 5 wk of age produced no sign...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198404000-00008
更新日期:1984-04-01 00:00:00
abstract::Prothrombin of newborns was investigated by means of the quantitative immunoelectrophoresis and the two-dimensional immunoelectrophoresis. The plasma of 10 of 24 healthy term newborns and of 5 preterm infants taken immediately after birth showed one prothrombin precipitate in the alpha-2-beta-globulin position when a ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-197911000-00011
更新日期:1979-11-01 00:00:00
abstract::Studies using stable isotopically labeled glucose and palmitate as precursors of pulmonary surfactant synthesis have demonstrated slow surfactant turnover in premature infants with respiratory distress syndrome (RDS). However, only limited data about surfactant turnover are available for term infants. Because acetate ...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000075084.56255.E0
更新日期:2003-08-01 00:00:00
abstract:BACKGROUND:Kawasaki disease (KD) is an acute febrile illness associated with the development of vasculitis. Administration of intravenous immunoglobulin (IVIG) is the standard treatment for KD. However, IVIG treatment is not effective in approximately 15% of children with KD. Some reports have presented evidence of imm...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1038/pr.2015.12
更新日期:2015-04-01 00:00:00
abstract::We have previously shown that milk sensitization aggravates intestinal dysfunction in the malnourished guinea pigs, suggesting that it may also impair the recovery from malnutrition. To test this hypothesis, the growing guinea pigs were malnourished by feeding only maize for 7 d and then were refed for 21 d with a bal...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199812000-00018
更新日期:1998-12-01 00:00:00
abstract::We determined the inhibitory effects of concentrations of tin- and zinc protoporphyrin (1-100 microM) and mesoporphyrin (0.1-10 microM) on the in vitro heme oxygenase (HO) (E.C.1.14.99.3) activity in liver, spleen, and intestine 13,000 x g tissue supernatants from fasted adult male Wistar rats through measurement of c...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198910000-00015
更新日期:1989-10-01 00:00:00
abstract::We used an in vitro assay to study and compare the growth-promotional activity of protein and nonprotein components in human milk (HM) and cow milk (CM) samples for infant strains of Bifidobacterium species. HM samples varied considerably in growth-promotion activity for Bifidobacterium bifidum var pennsylvanicus, Bif...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199102000-00021
更新日期:1991-02-01 00:00:00
abstract::Fourteen of 100 unselected patients in an intensive care nursery were found by the auditory brainstem evoked response (ABR) method to suffer significant hearing loss; of these 8 were ultimately discharged home. Analysis of the 100 clinical records identified 9 risk factors of which most, like low Apgar scores, are alr...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-198002000-00019
更新日期:1980-02-01 00:00:00
abstract::We recently demonstrated that recombinant hGH exacerbates renal functional and structural injury in chronic puromycin aminonucleoside (PAN) nephropathy, an experimental model of glomerular disease. Therefore, we examined whether recombinant human (rh) IGF-I is a safer alternative for the treatment of growth failure in...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-199601000-00002
更新日期:1996-01-01 00:00:00
abstract::IL-8/CXC ligand (CXCL) 8 is ingested in high concentrations by the human fetus/neonate with amniotic fluid and human milk, and is also produced constitutively by intestinal epithelial cells (IEC). We have shown that recombinant human IL-8/CXCL8 (rhIL-8/CXCL8) protects cultured IEC against tumor necrosis factor (TNF)-a...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/01.PDR.0000133196.25949.98
更新日期:2004-08-01 00:00:00
abstract::The key enzymes in the synthesis of the naturally occurring polyamines, ornithine decarboxylase (ODC) and S-adenosyl methionine (SAM) decarboxylase, were investigated during cell growth and aging in fibroblast cultures from normal patients and patients with cystic fibrosis. A linear correlation between increased S-ade...
journal_title:Pediatric research
pub_type: 杂志文章
doi:10.1203/00006450-197703000-00009
更新日期:1977-03-01 00:00:00