title: Multichannel lens-free CMOS sensors for real-time monitoring of cell growth.
abstract: A low-cost platform is proposed for the growth and real-time monitoring of biological cells. The main components of the platform include a PMMA cell culture microchip and a multichannel lens-free CMOS (complementary metal-oxide-semiconductor) / LED imaging system. The PMMA microchip comprises a three-layer structure and is fabricated using a low-cost CO2 laser ablation technique. The CMOS / LED monitoring system is controlled using a self-written LabVIEW program. The platform has overall dimensions of just 130 × 104 × 115 mm(3) and can therefore be placed within a commercial incubator. The feasibility of the proposed system is demonstrated using HepG2 cancer cell samples with concentrations of 5000, 10 000, 20 000, and 40 000 cells/mL. In addition, cell cytotoxicity tests are performed using 8, 16, and 32 mM cyclophosphamide. For all of the experiments, the cell growth is observed over a period of 48 h. The cell growth rate is found to vary in the range of 44∼52% under normal conditions and from 17.4∼34.5% under cyclophosphamide-treated conditions. In general, the results confirm the long-term cell growth and real-time monitoring ability of the proposed system. Moreover, the magnification provided by the lens-free CMOS / LED observation system is around 40× that provided by a traditional microscope. Consequently, the proposed system has significant potential for long-term cell proliferation and cytotoxicity evaluation investigations.
authors.affiliation: Department of Biological Science and Technology, National Pingtung University of Science and Technology, Pingtung, Taiwan.
authors.forename: Ko-Tung
authors.initials: KT
authors.lastname: Chang
authors.forename: Yu-Jen
authors.initials: YJ
authors.lastname: Chang
authors.forename: Chia-Ling
authors.initials: CL
authors.lastname: Chen
authors.forename: Yao-Nan
authors.initials: YN
authors.lastname: Wang
mesh_terms: D018929:Cell Culture Techniques / Q000295:instrumentation*; D049109:Cell Proliferation; D002470:Cell Survival; D004867:Equipment Design; D056945:Hep G2 Cells; D006801:Humans; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation*; D012666:Semiconductors
keywords: CMOS; Cell growth; Cytotoxicity; PMMA