Simple and Rapid Method of Microwell Array Fabrication for Drug Testing on 3D Cancer Spheroids

Area of Science:

• Biotechnology
• Cancer Research
• Materials Science

Background:

• Three-dimensional (3D) cell cultures offer more physiologically relevant cancer research models than 2D systems.
• Microwell systems, particularly poly(ethylene glycol) (PEG) microwells, provide an improved microenvironment mimicking in vivo conditions.
• Existing microwell fabrication methods are often costly and time-consuming.

Purpose of the Study:

• To develop a cost-effective and efficient method for fabricating 3D microwell systems.
• To utilize these 3D microwell systems for testing drug efficacy in a cancer model.
• To evaluate the therapeutic potential of zerumbone-loaded liposomes in liver cancer.

Main Methods:

• A low-cost laser etching technique on poly(methyl methacrylate) was used, followed by PDMS molding to create microwells.
• Optimal microwell fabrication parameters were determined (600 mm/s speed, 20% power, 0.4 mm diameter).
• A HepG2 liver cancer cell model was cultured in the microwells for 7 days, followed by drug testing using live/dead assays.

Main Results:

• The study successfully fabricated concave microwells using the optimized laser etching and molding process.
• The 3D cancer model reached full size in 7 days, enabling drug efficacy testing.
• Zerumbone-loaded liposomes demonstrated high efficacy against HepG2 cancer cells, with an IC50 value greater than free zerumbone, indicating targeted delivery and enhanced potency.

Conclusions:

• The developed low-cost microwell fabrication method provides a viable platform for 3D cell culture and drug screening.
• Zerumbone-loaded liposomes show significant potential for targeted liver cancer therapy due to their efficacy and delivery capabilities.
• This 3D cell culture approach enhances the accuracy of drug testing, paving the way for more effective cancer treatment strategies.