Engineering an artificial alveolar-capillary membrane: a novel continuously perfused model within microchannels

Area of Science:

• Biomedical Engineering
• Regenerative Medicine
• Microfluidics

Background:

• Pulmonary hypoplasia, characterized by underdeveloped lungs, has a poor prognosis.
• Current treatments for pulmonary hypoplasia aim to augment lung tissue using biocompatible materials.
• A key challenge in pulmonary tissue engineering is creating a stable, bio-mimetic alveolar-capillary membrane.

Purpose of the Study:

• To develop novel biomimetic microfluidic devices to model the alveolar-capillary membrane.
• To create a stable platform for culturing lung-specific cells, mimicking the in vivo alveolar environment.
• To advance the development of artificial lung tissue for therapeutic applications.

Main Methods:

• Fabrication of microfluidic devices using polydimethylsiloxane (PDMS) and glass.
• Integration of a suspended membrane within a multi-stage microdevice for air-liquid interface culture.
• Culturing of pulmonary endothelial (HMEC-1) and alveolar epithelial (A549) cell lines, and fetal pulmonary cells (FPC) under various hydrodynamic conditions.
• Assessment of cell viability, function, and proliferation, including phenotype maintenance at the air-liquid interface.

Main Results:

• Single-layer microdevices facilitated the determination of optimal growth conditions for lung cells.
• The multi-layered device successfully supported alveolar cell culture at an air-liquid interface.
• A greater decrease in surface tension was observed in A549 cultures exposed to air compared to submerged cultures, indicating functional surfactant activity.

Conclusions:

• Biomimetic microfluidic devices were successfully developed for stable alveolar cell growth at the air-liquid interface.
• These devices represent a critical prerequisite for the development of an implantable artificial alveolar membrane.
• This research paves the way for advanced pulmonary tissue engineering strategies.