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Related Experiment Videos

Hypophysectomy and porcine fetal lung development.

K E Pinkerton1, J Z Kendall, G C Randall

  • 1Department of Anatomy, School of Veterinary Medicine, University of California, Davis 95616.

American Journal of Respiratory Cell and Molecular Biology
|October 1, 1989
PubMed
Summary

Hypophysectomy significantly reduced fetal lung volume and alveolar surface area. It also altered alveolar type II cell composition, impacting lung development.

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Area of Science:

  • Developmental Biology
  • Pulmonary Medicine
  • Endocrinology

Background:

  • Fetal lung development is a complex process influenced by hormonal factors.
  • The pituitary gland plays a crucial role in regulating fetal growth and organ maturation.

Purpose of the Study:

  • To investigate the impact of hypophysectomy on fetal lung development and alveolar type II cell maturation in pigs.
  • To understand the role of pituitary hormones in lung morphogenetic and cytodifferentiation processes.

Main Methods:

  • Hypophysectomy was performed on fetal pigs at gestational day 69-70.
  • Control littermates were used for comparison.
  • Lungs were analyzed at term (113 days gestation) following intratracheal fixation.

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Main Results:

  • Hypophysectomized fetuses had 53% smaller total lung volume and half the alveolar surface area of controls.
  • Despite similar body weight, hypophysectomized fetuses showed altered alveolar septal tissue composition and reduced lamellar body volume in type II cells.
  • Type II cells in hypophysectomized fetuses had higher glycogen content and reduced contact with mesenchymal cells.

Conclusions:

  • Hypophysectomy significantly impairs fetal lung morphogenetic and cytodifferentiation processes.
  • Pituitary hormones are critical for normal lung development, particularly for alveolarization and type II cell maturation.
  • These findings highlight the endocrine regulation of pulmonary development during the late gestation period.