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Hampered Lung Maturation in Methimazole-Induced Hypothyroidism in Fetal Chicken: Morphological and Molecular
Sigrid Bjørnstad1, Athina Samara, Aage Erichsen
1Department of Pathology, Oslo University Hospital HF, Ullevx00E5;l, Oslo, Norway.
Background:
Molecular understanding of lung development is crucial for developing therapies and diagnostic tools. Animal models with altered thyroid hormone signaling provide mechanistic insight into thyroid-dependent neonatal lung disease. Repression of Klf2 (Krüppel-like factor 2), a suggested T3 target gene, is associated with disrupted lung development in mice. Klf2 is proposed to be specifically involved in type I pneumocyte differentiation.
Objectives:
To explore mechanisms of thyroid-dependent lung disease, we studied developing chicken fetuses with experimentally induced hypothyroidism.
Methods:
Morphology and the expression of a panel of molecules linked to Klf2 were assessed using histology, immunohistochemistry, Western blot and qPCR.
Results:
Methimazole injections at E14 hampered lung maturation. The effects of methimazole were evident in several tissue compartments, and impacted on both pneumocyte and vascular differentiation, suggesting cellular and molecular pleiotropy.
Conclusions:
Concomitant expression changes in a panel of selected microRNAs regulated by Klf2 suggest importance in lung development. These microRNAs may thus represent potential clinical targets and diagnostic and prognostic tools in thyroid-dependent lung disease.
Insights
Thyroid hormone disruption impairs neonatal lung development by affecting cell differentiation. Klf2 (Krüppel-like factor 2) and microRNAs are key players, offering potential diagnostic and therapeutic targets for lung disease.
Area of Science:
- Developmental Biology
- Endocrinology
- Pulmonology
Background:
- Thyroid hormone signaling is vital for neonatal lung development.
- Altered signaling can lead to thyroid-dependent neonatal lung disease.
- Klf2 (Krüppel-like factor 2), a thyroid hormone target, is implicated in disrupted lung development.
Purpose of the Study:
- To investigate the mechanisms of thyroid-dependent lung disease.
- To explore the role of Klf2 in lung development using a chicken model.
Main Methods:
- Experimentally induced hypothyroidism in developing chicken fetuses.
- Histology, immunohistochemistry, Western blot, and qPCR to assess lung morphology and gene expression.
- Analysis of Klf2-associated molecules and microRNAs.
Main Results:
- Methimazole-induced hypothyroidism at E14 inhibited lung maturation.
- Disrupted lung development affected both pneumocyte and vascular differentiation.
- Changes in microRNA expression linked to Klf2 were observed.
Conclusions:
- Thyroid hormone's role in lung development is pleiotropic, affecting multiple cell types.
- Klf2 and associated microRNAs are important in lung development.
- These microRNAs may serve as diagnostic and therapeutic targets for thyroid-dependent lung diseases.
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