Abstract
Pulmonary hypoplasia has been found in the human neonatal autopsy population and has been attributed to an alteration in epithelial-mesenchymal interactions during development of the lung. Pulmonary acinar aplasia is a very rare and severe form of pulmonary hypoplasia. The transforming growth factor-betas (TGF-β) are multifunctional regulatory peptides that are secreted by a variety of normal and malignant cells and are expressed in developing organs including the lung; their tissue distribution patterns have possible significance for signaling roles in many epithelial-mesenchymal interactions. Here, we report our examination of TGF-β in the lungs of a term female infant diagnosed with pulmonary acinar aplasia whose autopsy revealed extremely hypoplastic lungs with complete absence of alveolar ducts and alveoli. Immunohistochemical and in situ hybridization analyses were used to localize and measure the proteins and mRNA, respectively, for TGF-β1, TGF-β2, TGF-β3, and TGF-β type I and type II receptors (TGF-β RI and RII) in formalin-fixed and paraffin-embedded sections of these hypoplastic lungs and normal lungs. Immunostaining for TGF-β1, TGF-β2, and TGF-β RI and RII was significantly lower in the bronchial epithelium and muscle of the hypoplastic lungs than in normal lungs, whereas no difference was detected in staining for other proteins including Clara cell 10-kD protein, adrenomedullin, hepatocyte growth factor/scatter factor, and hepatocyte growth factor receptor/Met in the hypoplastic and normal lungs or in the liver and kidneys of this infant compared with normal liver and kidney. In addition, in situ hybridization showed that TGF-β1 and TGF-β RI transcripts were considerably reduced in the bronchial epithelium of the hypoplastic lung compared with normal lung. These results show that there is a selective reduction of TGF-β in pulmonary acinar aplasia and suggest that the signaling action of TGF-β in epithelial-mesenchymal interactions in the lungs of this developmental condition may be compromised.
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Abbreviations
- TGF-β:
-
transforming growth factor-β
- AM:
-
adrenomedullin
- TGF-β RI and RII:
-
transforming growth factor-β receptor type I and II
- CC10:
-
Clara cell 10-kD protein
- CCAM:
-
congenital cystic adenomatoid malformation
- RT-PCR:
-
reverse transcription polymerase chain reaction
- HGF:
-
hepatocyte growth factor
- SF:
-
scatter factor
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Acknowledgements
The authors thank Drs. M. Tsao (University of Toronto), L. Montuenga (National Cancer Institute), and J. Letterio (National Cancer Institute) for helpful suggestions in writing.
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Chen, MF., Gray, K., Prentice, M. et al. Human Pulmonary Acinar Aplasia: Reduction of Transforming Growth Factor-β Ligands and Receptors. Pediatr Res 46, 61–70 (1999). https://doi.org/10.1203/00006450-199907000-00011
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DOI: https://doi.org/10.1203/00006450-199907000-00011
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