The preparation of cell-containing microbubble scaffolds to mimic alveoli structure as a 3D drug-screening system for lung cancer

Area of Science:

• Biomaterials Engineering
• Cancer Research
• Drug Development

Background:

• Lung cancer is a leading cause of mortality, with high failure rates in oncology drug development due to unreliable in vitro efficacy evaluations.
• Traditional 2D cell cultures and current 3D models fail to accurately mimic the physiological conditions and delicate structure of lung alveoli.
• There is a critical need for advanced preclinical models that better predict anticancer drug efficacy in lung cancer.

Purpose of the Study:

• To develop a novel microbubble scaffold that accurately mimics the structure and mechanical properties of lung alveoli.
• To evaluate the scaffold's biocompatibility and its utility in assessing anticancer drug efficacy.
• To compare the cellular response to chemotherapy in the microbubble scaffold model versus traditional 2D cultures.

Main Methods:

• Fabrication of enzyme-crosslinked gelatin microbubble scaffolds using a microfluidic device, incorporating A549 lung cancer cells.
• Characterization of scaffold structure, pore size, mechanical properties, and biocompatibility.
• Assessment of gemcitabine efficacy, including effective concentration and treatment time, on cancer cells within the microbubble scaffolds.
• Confirmation of gemcitabine-induced apoptosis using Western blotting, real-time PCR, H&E staining, and TUNEL assay.

Main Results:

• The microbubble scaffold successfully mimicked lung alveoli structure with uniform pore size (~100 μm) and exhibited good biocompatibility.
• Significantly higher gemcitabine concentrations and longer treatment times were required to induce cell death in microbubble scaffolds compared to 2D cultures.
• Gemcitabine treatment induced apoptosis and DNA damage in cancer cells within the scaffold, consistent with clinical observations.
• The scaffold demonstrated cellular responses to gemcitabine treatment comparable to clinical regimens for lung carcinoma.

Conclusions:

• The developed cell-containing microbubble scaffold effectively mimics lung alveoli structure and function.
• This advanced 3D model offers a more accurate platform for preclinical evaluation of anticancer drugs, particularly for lung cancer.
• The microbubble scaffold holds significant promise for improving the success rate of oncology drug discovery by providing reliable preclinical predictions.