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Neuroendocrine cells in the developing human lung: morphologic and functional considerations.

E Cutz, J E Gillan, A C Bryan

    Pediatric Pulmonology
    |May 1, 1985
    PubMed
    Summary

    Human fetal lung neuroendocrine (NE) cells develop throughout gestation, with serotonin-positive cells appearing early and bombesin-positive cells increasing near term. These findings suggest a crucial role for NE cells in fetal lung development and neonatal adaptation.

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    Area of Science:

    • Developmental Biology
    • Pulmonology
    • Cell Biology

    Background:

    • Neuroendocrine (NE) cells are present in the human lung.
    • Their structure, distribution, and frequency during fetal development are not fully understood.

    Purpose of the Study:

    • To describe the structure, distribution, and frequency of NE cells in the human fetal lung from early development to term.
    • To investigate the differentiation patterns and markers of NE cells during lung development.

    Main Methods:

    • Electron microscopy was used to examine NE cell ultrastructure.
    • Immunostaining for serotonin and bombesin was performed to identify and quantify NE cells.
    • NE cell distribution was analyzed in relation to airway development.

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    Main Results:

    • NE cells differentiate centrifugally, following bronchial tree development.
    • Serotonin-immunoreactive NE cells were detected at 8 weeks' gestation, more frequent in early stages and larger airways.
    • Bombesin-immunoreactive NE cells appeared at 10 weeks' gestation, increasing towards term and concentrating in peripheral airways.

    Conclusions:

    • NE cells are well-differentiated and numerous in the fetal lung, increasing towards term.
    • These findings suggest a significant role for NE cells in intrauterine life and neonatal adaptation.
    • Further research is needed to elucidate the specific neurohormonal, paracrine, or endocrine functions of fetal lung NE cells.