Cargando…
Effects of Glucocorticoid Exposure on Growth and Structural Maturation of the Heart of the Preterm Piglet
Inadequate maintenance of systemic blood flow in neonates following preterm birth is associated with increased morbidity and mortality, and may be due in part to structural immaturity of the myocardium. Maternal glucocorticoid administration is associated with improved cardiovascular function, and p...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2014
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3968162/ https://www.ncbi.nlm.nih.gov/pubmed/24676209 http://dx.doi.org/10.1371/journal.pone.0093407 |
_version_ | 1782309125052432384 |
---|---|
author | Kim, Min Young Eiby, Yvonne A. Lumbers, Eugenie R. Wright, Layne L. Gibson, Karen J. Barnett, Amanda C. Lingwood, Barbara E. |
author_facet | Kim, Min Young Eiby, Yvonne A. Lumbers, Eugenie R. Wright, Layne L. Gibson, Karen J. Barnett, Amanda C. Lingwood, Barbara E. |
author_sort | Kim, Min Young |
collection | PubMed |
description | Inadequate maintenance of systemic blood flow in neonates following preterm birth is associated with increased morbidity and mortality, and may be due in part to structural immaturity of the myocardium. Maternal glucocorticoid administration is associated with improved cardiovascular function, and possibly promotes structural maturation of the myocardium. This study assessed the structural maturity of the myocardium in male and female preterm and term piglets, and preterm piglets exposed to a regimen of maternal glucocorticoids as used clinically. In preterm, term and glucocorticoid exposed preterm piglets cardiomyocyte maturity was examined by measuring the proportion of binucleated myocytes and the volumes of single living ventricular cardiomyocytes with fluorescence microscopy. Ventricular apoptosis and proliferation were measured by immunohistochemistry. Preterm piglet hearts had fewer binucleated myocytes, smaller myocytes, and more proliferative and fewer apoptotic nuclei than term hearts. Maternal glucocorticoid treatment resulted in increased binucleation with no increase in myocyte volume, and levels of proliferation and apoptosis that were more similar to the term heart. Atrial weights were increased and in female piglets there was an increase in the ratio of left to right ventricular weight. The observed changes in atrial mass and myocyte structural maturation correlated with changes in cardiac function of isolated hearts of littermates. In conclusion, the association between increased myocardial maturation following glucocorticoid exposure, improved cardiac function in littermates, and clinical improvement in human neonatal cardiac function exposed to antenatal glucocorticoids, suggests that glucocorticoid exposure contributes to improved cardiovascular function in preterm infants by promoting myocardial structural maturity. |
format | Online Article Text |
id | pubmed-3968162 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-39681622014-04-01 Effects of Glucocorticoid Exposure on Growth and Structural Maturation of the Heart of the Preterm Piglet Kim, Min Young Eiby, Yvonne A. Lumbers, Eugenie R. Wright, Layne L. Gibson, Karen J. Barnett, Amanda C. Lingwood, Barbara E. PLoS One Research Article Inadequate maintenance of systemic blood flow in neonates following preterm birth is associated with increased morbidity and mortality, and may be due in part to structural immaturity of the myocardium. Maternal glucocorticoid administration is associated with improved cardiovascular function, and possibly promotes structural maturation of the myocardium. This study assessed the structural maturity of the myocardium in male and female preterm and term piglets, and preterm piglets exposed to a regimen of maternal glucocorticoids as used clinically. In preterm, term and glucocorticoid exposed preterm piglets cardiomyocyte maturity was examined by measuring the proportion of binucleated myocytes and the volumes of single living ventricular cardiomyocytes with fluorescence microscopy. Ventricular apoptosis and proliferation were measured by immunohistochemistry. Preterm piglet hearts had fewer binucleated myocytes, smaller myocytes, and more proliferative and fewer apoptotic nuclei than term hearts. Maternal glucocorticoid treatment resulted in increased binucleation with no increase in myocyte volume, and levels of proliferation and apoptosis that were more similar to the term heart. Atrial weights were increased and in female piglets there was an increase in the ratio of left to right ventricular weight. The observed changes in atrial mass and myocyte structural maturation correlated with changes in cardiac function of isolated hearts of littermates. In conclusion, the association between increased myocardial maturation following glucocorticoid exposure, improved cardiac function in littermates, and clinical improvement in human neonatal cardiac function exposed to antenatal glucocorticoids, suggests that glucocorticoid exposure contributes to improved cardiovascular function in preterm infants by promoting myocardial structural maturity. Public Library of Science 2014-03-27 /pmc/articles/PMC3968162/ /pubmed/24676209 http://dx.doi.org/10.1371/journal.pone.0093407 Text en © 2014 Kim et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited. |
spellingShingle | Research Article Kim, Min Young Eiby, Yvonne A. Lumbers, Eugenie R. Wright, Layne L. Gibson, Karen J. Barnett, Amanda C. Lingwood, Barbara E. Effects of Glucocorticoid Exposure on Growth and Structural Maturation of the Heart of the Preterm Piglet |
title | Effects of Glucocorticoid Exposure on Growth and Structural Maturation of the Heart of the Preterm Piglet |
title_full | Effects of Glucocorticoid Exposure on Growth and Structural Maturation of the Heart of the Preterm Piglet |
title_fullStr | Effects of Glucocorticoid Exposure on Growth and Structural Maturation of the Heart of the Preterm Piglet |
title_full_unstemmed | Effects of Glucocorticoid Exposure on Growth and Structural Maturation of the Heart of the Preterm Piglet |
title_short | Effects of Glucocorticoid Exposure on Growth and Structural Maturation of the Heart of the Preterm Piglet |
title_sort | effects of glucocorticoid exposure on growth and structural maturation of the heart of the preterm piglet |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3968162/ https://www.ncbi.nlm.nih.gov/pubmed/24676209 http://dx.doi.org/10.1371/journal.pone.0093407 |
work_keys_str_mv | AT kimminyoung effectsofglucocorticoidexposureongrowthandstructuralmaturationoftheheartofthepretermpiglet AT eibyyvonnea effectsofglucocorticoidexposureongrowthandstructuralmaturationoftheheartofthepretermpiglet AT lumberseugenier effectsofglucocorticoidexposureongrowthandstructuralmaturationoftheheartofthepretermpiglet AT wrightlaynel effectsofglucocorticoidexposureongrowthandstructuralmaturationoftheheartofthepretermpiglet AT gibsonkarenj effectsofglucocorticoidexposureongrowthandstructuralmaturationoftheheartofthepretermpiglet AT barnettamandac effectsofglucocorticoidexposureongrowthandstructuralmaturationoftheheartofthepretermpiglet AT lingwoodbarbarae effectsofglucocorticoidexposureongrowthandstructuralmaturationoftheheartofthepretermpiglet |