当前位置： SCI文献检索 > AMERICAN JOURNAL OF RESPIRATORY AND CRITICAL CARE MEDICINE期刊下所有文献 > Growth of pulmonary microvasculature in ventilated preterm infants.

Growth of pulmonary microvasculature in ventilated preterm infants.

Abstract：

RATIONALE:Density-based morphometric studies have demonstrated decreased capillary density in infants with bronchopulmonary dysplasia (BPD) and in BPD-like animal models, leading to the prevailing view that microvascular development is disrupted in BPD. OBJECTIVE:To perform a comprehensive analysis of the early and late effects of ventilation on pulmonary microvascular growth in preterm infants. METHODS:Postmortem lung samples were collected from ventilated preterm infants who died between 23 and 29 wk ("short-term ventilated") or between 36 and 39 wk ("long-term ventilated") corrected postmenstrual age. Results were compared with age-matched infants or stillborn infants ("early" and "late" control subjects). Microvascular growth was studied by anti-platelet endothelial cell adhesion molecule (PECAM)-1 immunohistochemistry, quantitative stereology, analysis of endothelial cell proliferation, and Western blot analysis of pulmonary PECAM-1 protein levels. MEASUREMENTS:Measurements were made of capillary density, volume of air-exchanging parenchyma, volume of microvascular endothelial cells, Ki67 labeling index of endothelial cells, and PECAM-1/actin protein levels. MAIN RESULTS:Lungs of long-term ventilated infants showed a significant (more than twofold) increase in volume of air-exchanging parenchyma and a 60% increase in total pulmonary microvascular endothelial volume compared with late control subjects, associated with 60% higher pulmonary PECAM-1 protein levels. The marked expansion of the pulmonary microvasculature in ventilated lungs was, at least partly, attributable to brisk endothelial cell proliferation. The microvasculature of ventilated lungs appeared immature, retaining a saccular architectural pattern. CONCLUSIONS:The pulmonary microvasculature of ventilated preterm infants displayed marked angiogenesis, nearly proportionate to the growth of the air-exchanging lung parenchyma. These results challenge the paradigm of microvascular growth arrest as a major pathogenic factor in BPD.

journal_name

Am J Respir Crit Care Med

journal_title

American journal of respiratory and critical care medicine

authors

De Paepe ME,Mao Q,Powell J,Rubin SE,DeKoninck P,Appel N,Dixon M,Gundogan F

doi

10.1164/rccm.200506-927OC

keywords:

subject

Has Abstract

pub_date

2006-01-15 00:00:00

pages

204-11

issue

eissn

1073-449X

issn

1535-4970

pii

200506-927OC

journal_volume

173

pub_type

杂志文章

在线工具

Growth of pulmonary microvasculature in ventilated preterm infants.