Surfactant disaturated phosphatidylcholine kinetics in infants with bronchopulmonary dysplasia measured with stable isotopes and a two-compartment model

被引:14
作者
Cogo, PE
Toffolo, GM
Gucciardi, A
Benetazzo, A
Cobelli, C
Carnielli, VP
机构
[1] Univ Padua, Dept Pediat, I-35128 Padua, Italy
[2] Univ Padua, Dept Informat Engn, I-35128 Padua, Italy
[3] Osped Riuniti Ancona, Presidio Salesi, Div Neonatol, Ancona, Italy
[4] UCL, Inst Child Hlth, Childhood Nutr Res Ctr, London, England
关键词
pulmonary surfactant; stable isotopes; phospholipids;
D O I
10.1152/japplphysiol.01423.2004
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
We previously found a shorter surfactant disaturated phosphatidylcholine palmitate (DSPC-PA) half-life in infants with bronchopulmonary dysplasia (BPD) by using a single stable isotope tracer and simple formulas based on a one-exponential fit of the final portion of the enrichment decay curve. The aim of this study was to apply noncompartmental and compartmental analysis on the entire enrichment decay curve of DSPC-PA and to compare the kinetic data with our previous results. We analyzed 10 preterm newborns with BPD ( gestational age 26 +/- 0.6 wk, weight 777 +/- 199 g) and 6 controls ( gestational age 26 +/- 1.4 wk, weight 787 +/- 259 g). All took part in our previous study. Endotracheal C-13-labeled dipalmitoyl phosphatidylcholine was administered, and the C-13-enrichment of surfactant DSPC-PA was measured from serial tracheal aspirates by gas chromatography-mass spectrometry. Noncompartmental and compartmental models were numerically identified from the tracer-to-tracee ratio and kinetic parameters related to the accessible ( pool accessible to sampling, likely to be the lung alveolar pool) and to the nonaccessible pools ( pools not accessible to samplings, likely to be the intracellular storage pool) were estimated in the two study groups. Comparison was performed by Mann-Whitney test. A two-compartment model provided the most reliable assessment of DSPC-PA kinetics. In BPD vs. controls, mean +/- SE residence time of DSPC-PA in the accessible was 17.5 +/- 2.6 vs. 32.2 +/- 6.4 h ( P < 0.05), whereas it was 49.7 +/- 3.5 vs. 54.4 +/- 3.9 h (NS, not significant) in the nonaccessible pool; DSPC-PA recycling was 0.26 +/- 0.05 vs. 0.43 +/- 0.04% ( NS), respectively. A two-compartment model of surfactant DSPC-PA kinetics allowed a thorough assessment of DSPC-PA kinetics, including masses, synthesis, and fluxes between pools. The most important findings of this study are that in BPD infants DSPC-PA loss from the alveolar pool was higher and recycling through the intracellular pool lower than in controls.
引用
收藏
页码:323 / 329
页数:7
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