Betamethasone and the Rhesus Fetus: Effect on Lung Morphometry and Connective Tissue View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

1981-03

AUTHORS

Jeanne C Beck, Wayne Mitzner, John W C Johnson, Grover M Hutchins, Jean-Michel Foidart, William T London, Amos E Palmer, Rachel Scott

ABSTRACT

Pregnant rhesus monkeys (Macaca mulatta) at 67 to 85% of term pregnancy were treated with betamethasone for 3 days and then delivered by cesarean section. These treated fetuses had larger lung volumes (32.6 +/- 1.8 ml/kg of body weight) compared to gestational age-matched controls (22.9 +/- 3.2 ml/kg of body weight; P less than 0.025) but no alterations in surfactant properties as measured by amniotic fluid L/S ratios, alveolar deflation stability, or lung phosphatidylcholine. These findings suggest that betamethasone effects an increase in fetal lung volume by some method other than alteration in alveolar surfactant concentrations. Results also demonstrated an 11% increase in the collagen to elastin concentration in the treated fetuses as compared to the control animals (P less than 0.01), suggesting alterations in lung connective tissue. Morphometric studies done on the air-fixed inflated lung demonstrated a decrease in the number of alveoli per unit volume of lung among the treated animals (0.95 +/- 0.07 x 10(6)) compared to the control animals (1.19 +/- 0.08 x 10(6); P less than 0.025) and a reduction in the mean surface area of the lungs of the treated animals (506 +/- 10 cm2 per cm3) compared to the control animals (561 +/- 9 cm2 per cm3; P less than 0.005). These findings suggest that at least part of the increased maximal lung volumes is related to increased alveolar distensibility. Together, these pressure volume findings, biochemical studies, and morphometric analyses indicate that a major effect of betamethasone on the rhesus fetal lung is to alter lung connective tissue characteristics. Alterations in lung surfactant appear to be of less functional significance in this rhesus fetal model. The disparity between these findings and other animal studies might be due to differences in species, the preparation, or the method of glucocorticoid administration. More... »

PAGES

235

Identifiers

URI

http://scigraph.springernature.com/pub.10.1203/00006450-198103000-00007

DOI

http://dx.doi.org/10.1203/00006450-198103000-00007

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1031776829

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/7220145


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