Abstract
Current methods to replace damaged upper airway epithelium with exogenous cells are limited. Existing strategies use grafts that lack mucociliary function, leading to infection and the retention of secretions and keratin debris. Strategies that regenerate airway epithelium with mucociliary function are clearly desirable and would enable new treatments for complex airway disease. Here, we investigated the influence of the extracellular matrix on airway epithelial cell adherence, proliferation and mucociliary function in the context of bioengineered mucosal grafts. In vitro, primary human airway epithelial cells adhere most readily to collagen IV. Biological, biomimetic and synthetic scaffolds were compared in terms of their extracellular matrix protein content and airway epithelial cell adherence. Collagen IV and laminin were preserved on the surface of decellularised dermis and epithelial cell attachment to decellularised dermis was greater than to the biomimetic or synthetic alternatives tested. Blocking epithelial integrin α2 led to decreased adherence to collagen IV and to decellularised dermis scaffolds. At air-liquid interface, bronchial epithelial cells cultured on decellularised dermis scaffolds formed a differentiated respiratory mucosal layer with mucociliary function. Using in vivo chick chorioallantoic membrane and rabbit airway models, we showed short-term preservation of the differentiated cell layer following transplantation. Our results demonstrate the feasibility of generating human airway epithelial cell grafts on clinically applicable decellularised dermis scaffolds and identify matrix proteins and integrins important for this process. The long-term survivability of pre-differentiated epithelia and the relative merits of this approach against transplanting basal cells should be assessed further in pre-clinical airway transplantation models.
Footnotes
This manuscript has recently been accepted for publication in the European Respiratory Journal. It is published here in its accepted form prior to copyediting and typesetting by our production team. After these production processes are complete and the authors have approved the resulting proofs, the article will move to the latest issue of the ERJ online. Please open or download the PDF to view this article.
Conflict of interest: Dr. Hamilton has nothing to disclose.
Conflict of interest: Dr. Lee has nothing to disclose.
Conflict of interest: Dr. Gowers has nothing to disclose.
Conflict of interest: Dr. Butler has nothing to disclose.
Conflict of interest: Dr. Maughan has nothing to disclose.
Conflict of interest: Dr. Jevans has nothing to disclose.
Conflict of interest: J. Orr has nothing to disclose.
Conflict of interest: Dr. McCann has nothing to disclose.
Conflict of interest: Dr. Burns has nothing to disclose.
Conflict of interest: Dr. MacNeil has nothing to disclose.
Conflict of interest: Dr. Birchall has nothing to disclose.
Conflict of interest: Dr. O'Callaghan has nothing to disclose.
Conflict of interest: Dr. Hynds has nothing to disclose.
Conflict of interest: Dr. Janes has nothing to disclose.
- Received May 21, 2018.
- Accepted February 26, 2020.
- Copyright ©ERS 2020