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Multi-analyte Biochip (MAB) Based on All-solid-state Ion-selective Electrodes (ASSISE) for Physiological Research
Published on: April 18, 2013
Electrochemical chip integrating scalable ring-ring electrode array to detect secreted alkaline phosphatase
Michiaki Takeda1, Hitoshi Shiku, Kosuke Ino
1Graduate School of Environmental Studies, Tohoku University, Sendai, 980-8579, Japan.
The Analyst
|October 7, 2011
Summary
This study presents a novel electrochemical platform for simultaneously detecting secreted alkaline phosphatase (SEAP) from mammalian cells. The microfabricated device enables sensitive and efficient parallel monitoring of enzyme activity in cell arrays.
Area of Science:
- Biomedical Engineering
- Electrochemistry
- Cell Biology
Background:
- Secreted alkaline phosphatase (SEAP) is a valuable reporter enzyme for monitoring gene expression in mammalian cells.
- Developing sensitive and high-throughput methods for SEAP detection is crucial for biological research and drug discovery.
- Existing methods may lack the sensitivity, throughput, or integration capabilities required for complex cellular assays.
Purpose of the Study:
- To develop and characterize a microfabricated electrochemical platform for parallel monitoring of SEAP.
- To evaluate the performance of a dual-mode ring-ring electrode array for enhanced electrochemical detection.
- To demonstrate the platform's capability in detecting SEAP expression from transfected mammalian cells.
Main Methods:
- Microfabrication of a 4x4 ring-ring electrode array on a mammalian-cell array chip.
- Electrochemical characterization using dual-mode (generator-collector) and single-mode configurations.
- Parallel monitoring of SEAP expression in HeLa cells using a multiplexer switching system.
- Enzyme activity detection via reduction current measurement at the collector electrode.
- Signal enhancement using a poly(dimethylsiloxane) block for enzyme and product accumulation.
Main Results:
- The dual-mode electrode configuration achieved a collection efficiency of approximately 50% with a current amplification ratio of 2.84 compared to single-mode.
- Significantly higher reduction currents were observed for SEAP-transfected HeLa cells compared to wild-type HeLa cells.
- Parallel monitoring of SEAP expression across 16 cellular spots was successfully demonstrated.
- A 5-minute incubation with a poly(dimethylsiloxane) block led to further signal enhancement.
Conclusions:
- The developed electrochemical platform enables sensitive and parallel monitoring of SEAP activity in mammalian cell arrays.
- The microfabricated ring-ring electrode array and dual-mode operation enhance detection sensitivity and efficiency.
- This platform holds promise for applications in gene expression studies, drug screening, and cellular assays.
