Surface plasmon resonance application in prostate cancer biomarker research
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Pavel Damborský
Abstract
Prostate cancer (PCa) diagnostics can be effectively addressed using sensor-based approaches. Proper selection of biomarkers to be included in biosensors for accurate detection becomes the need of the hour. Such biosensor and biochip technologies enable fast and efficient determination of proteins and provide a remarkable insight into the changes in the protein structure, such as aberrant glycosylation, which can increase the performance, sensitivity and specificity of clinic assays. However, for a thorough comprehension of such complex protein modifications, it is crucial to understand their biospecific interactions. Surface plasmon resonance (SPR), one of the most rapidly developing techniques for measuring real-time quantitative binding affinities and kinetics of the interactions of antigens and antibodies, was chosen as an appropriate tool for this purpose. Herein, experiments on the interactions of antibodies specific against different epitopes of free and complexed prostate-specific antigen (PSA), a prominent PCa biomarker, are presented with two main aims: (i) to continue as lectin glycoprofiling studies and; (ii) to be used in microfluidic immunoassay-based platforms for point-of-care devices. Various PSA-specific antibodies were covalently immobilized on the biochip surface via amine coupling, and free or complexed PSA was injected into the dual-flow channels of the SPR device. Kinetic parameters and affinity constants of these interactions, as well as cross-reactivities of the used antibodies were determined. The sandwich assay for PSA determination was developed employing both primary and secondary anti-PSA antibodies. Sensitivity of the assay was 3.63 nM−1, the detection limit was 0.27 nM and the SPR biosensor response towards free PSA was linear up to 25 nM. All these findings are essential for proper design of a selective, sensitive, and highly reliable biosensor for PCa diagnosis as a lab-on-chip device.
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© 2015 Institute of Chemistry, Slovak Academy of Sciences
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Articles in the same Issue
- Biosensors – Topical issue
- Biosensors containing acetylcholinesterase and butyrylcholinesterase as recognition tools for detection of various compounds
- Electrochemical enzymatic biosensors based on metal micro-/nanoparticles-modified electrodes: a review
- Gluconobacter sp. cells for manufacturing of effective electrochemical biosensors and biofuel cells
- Application of nanomaterials in microbial-cell biosensor constructions
- Use of green fluorescent proteins for in vitro biosensing
- Biosensors based on molecular beacons
- DNA aptamer-based detection of prostate cancer
- Can glycoprofiling be helpful in detecting prostate cancer?
- Graphene as signal amplifier for preparation of ultrasensitive electrochemical biosensors
- Electrochemical nanostructured biosensors: carbon nanotubes versus conductive and semi-conductive nanoparticles
- Surface plasmon resonance application in prostate cancer biomarker research
- Improvement of enzyme carbon paste-based biosensor using carbon nanotubes for determination of water-soluble analogue of vitamin E
- Enzymatic sensor of putrescine with optical oxygen transducer – mathematical model of responses of sensitive layer
- Detection of hydrogen peroxide and glucose by enzyme product precipitation on sensor surface
- Interfacing of microbial cells with nanoparticles: Simple and cost-effective preparation of a highly sensitive microbial ethanol biosensor
- Whole-cell optical biosensor for mercury – operational conditions in saline water
- Synthesis of carbon quantum dots for DNA labeling and its electrochemical, fluorescent and electrophoretic characterization
- Detection of short oligonucleotide sequences of hepatitis B virus using electrochemical DNA hybridisation biosensor
- Aptamer-based detection of thrombin by acoustic method using DNA tetrahedrons as immobilisation platform
- Interactions of antifouling monolayers: Energy transfer from excited albumin molecule to phenol red dye
- Third-generation oxygen amperometric biosensor based on Trametes hirsuta laccase covalently bound to graphite electrode
- Can voltammetry distinguish glycan isomers?
