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Transcriptional Regulation of Airway Epithelial Cell Differentiation: Insights into the Notch Pathway and Beyond

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MDPI
DOI: 10.3390/ijms241914789

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airway epithelial cells; multiciliated cells; secretory cells; Notch; transcription factors; airway epithelium

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The airway epithelium is a crucial component of the respiratory system, serving as a barrier against inhaled pathogens and toxins. Chronic respiratory diseases can disrupt the cellular composition of the airway epithelium, leading to a decrease in multiciliated cells and an increase in secretory cells. Basal cells are identified as the primary stem cells in the airway epithelium, capable of differentiating into multiciliated cells and secretory cells. Recent advancements in single-cell RNA sequencing techniques have provided insights into the cellular composition of the airway epithelium, highlighting the importance of understanding cellular composition and differentiation processes for targeted therapies for respiratory diseases.
The airway epithelium is a critical component of the respiratory system, serving as a barrier against inhaled pathogens and toxins. It is composed of various cell types, each with specific functions essential to proper airway function. Chronic respiratory diseases can disrupt the cellular composition of the airway epithelium, leading to a decrease in multiciliated cells (MCCs) and an increase in secretory cells (SCs). Basal cells (BCs) have been identified as the primary stem cells in the airway epithelium, capable of self-renewal and differentiation into MCCs and SCs. This review emphasizes the role of transcription factors in the differentiation process from BCs to MCCs and SCs. Recent advancements in single-cell RNA sequencing (scRNAseq) techniques have provided insights into the cellular composition of the airway epithelium, revealing specialized and rare cell types, including neuroendocrine cells, tuft cells, and ionocytes. Understanding the cellular composition and differentiation processes within the airway epithelium is crucial for developing targeted therapies for respiratory diseases. Additionally, the maintenance of BC populations and the involvement of Notch signaling in BC self-renewal and differentiation are discussed. Further research in these areas could provide valuable insights into the mechanisms underlying airway epithelial homeostasis and disease pathogenesis.

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