Clara Cell Protein Dynamics in Pulmonary Health
Summary
Clara cell secretory protein, also known as CC16 or CC10 and encoded by the SCGB1A1 gene, is predominantly produced by club cells in the bronchiolar epithelium. This small homodimeric protein exerts potent anti-inflammatory and antioxidant effects, contributes to maintenance of epithelial barrier integrity and modulates immune cell function within the airways. Fluctuations in CC16 levels in airways and circulation reflect exposures to pollutants, smoking and infectious agents, as well as the severity of obstructive or fibrotic lung diseases. Mechanistically, CC16 can suppress T helper 2 (Th2)-driven allergic inflammation by altering dendritic cell phenotypes and cytokine production, while also influencing epithelial host-defence programmes through receptor-mediated induction of antimicrobial peptides. Beyond its role as a biomarker of epithelial injury, CC16 has emerged as a promising therapeutic candidate for asthma, chronic obstructive pulmonary disease and pulmonary fibrosis. Advances in our understanding of its production, receptor interactions and downstream signalling pathways are converging on the development of CC16-based interventions to restore lung homeostasis and resilience in diverse clinical settings.
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Clara Cell Protein Dynamics in Pulmonary Health publication trend
The graph below shows the total number of articles in clara cell protein dynamics in pulmonary health across all publications each year (not limited to Nature Index journals).
Technical terms
Clara cell secretory protein (CC16/CC10/SCGB1A1): A 10–16 kDa homodimeric secretoglobin produced by bronchiolar club cells with anti-inflammatory and antioxidant roles in the lung.
Secretoglobins: A family of small, secreted proteins expressed by epithelial cells that regulate inflammation, tissue repair and immune homeostasis.
Th2 lymphocytes: A subset of T helper cells that drive allergic inflammation through cytokine secretion such as IL-4, IL-5 and IL-13.
Dendritic cells: Antigen-presenting immune cells that initiate adaptive immune responses and shape T-cell differentiation in the respiratory tract.
Very Late Antigen-2 (VLA-2): An epithelial integrin receptor that mediates CC16 binding and downstream signalling to augment antimicrobial peptide production.
SPLUNC1: Short palate lung and nasal epithelial clone 1, an airway antimicrobial protein whose expression is enhanced by CC16-VLA-2 interactions.
References
- Clara cell 10 (CC10) protein attenuates allergic airway inflammation by modulating lung dendritic cell functions. Cellular and Molecular Life Sciences (2024).
- CC16 drives VLA-2-dependent SPLUNC1 expression. Frontiers in Immunology (2023).
- Club Cell Secretory Protein in Lung Disease: Emerging Concepts and Potential Therapeutics. Annual Review of Medicine (2022).
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