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Related Experiment Videos

Thyroid hormone affects embryonic mouse lung branching morphogenesis and cellular differentiation.

Kwanchai Archavachotikul1, Teriggi J Ciccone, Mala R Chinoy

  • 1Department of Pediatrics, Division of Newborn Medicine, New England Medical Center, Tufts University School of Medicine, Boston, Massachusetts 02111, USA.

American Journal of Physiology. Lung Cellular and Molecular Physiology
|February 13, 2002
PubMed
Summary

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Thyroid hormone (T3) exposure during early mouse lung development reduces airway branching and growth. However, it accelerates cell differentiation, mimicking later fetal lung development stages.

Area of Science:

  • Developmental biology
  • Endocrinology
  • Pulmonology

Background:

  • Thyroid hormone (T3) is known to influence lung epithelial cell differentiation in late fetal development.
  • The impact of T3 on early embryonic lung morphogenesis remains largely unexplored.

Purpose of the Study:

  • To investigate the effects of T3 on embryonic mouse lung airway branching and the temporal-spatial differentiation of lung epithelium and mesenchyme.
  • To determine if T3 alters early lung development by examining cell proliferation and differentiation markers.

Main Methods:

  • Culture of gestational day 11.5 embryonic mouse lungs for 72 hours with varying doses of T3.
  • Evaluation of branching morphogenesis using terminal bud counts.
  • Assessment of cell proliferation and histological changes.

Related Experiment Videos

  • Immunocytochemical analysis of key developmental proteins (Nkx2.1, SP-C, Hoxb5).

    • Main Results:

    • T3 exposure led to a dose- and time-dependent decrease in airway branching and cell proliferation.
    • Histological analysis revealed T3-induced reduction in mesenchyme and an increase in cuboidal epithelia and airway space.
    • T3 treatment promoted the localization of Nkx2.1 and SP-C to cuboidal epithelial cells and reduced mesenchymal Hoxb5 expression, mimicking late fetal lung development.

    Conclusions:

    • Exogenous T3 treatment during early lung development accelerates epithelial and mesenchymal cell differentiation.
    • This accelerated differentiation occurs at the expense of reduced new branch formation and overall lung growth.
    • T3 exposure in early development shifts lung development towards a later-stage phenotype.