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Ruppert C, Kaiser L, Jacob LJ, Laufer S, Kohl M, Deigner HP. Duplex Shiny app quantification of the sepsis biomarkers C-reactive protein and interleukin-6 in a fast quantum dot labeled lateral flow assay. J Nanobiotechnology 2020; 18:130. [PMID: 32912236 PMCID: PMC7481553 DOI: 10.1186/s12951-020-00688-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 08/30/2020] [Indexed: 01/09/2023] Open
Abstract
Fast point-of-care (POC) diagnostics represent an unmet medical need and include applications such as lateral flow assays (LFAs) for the diagnosis of sepsis and consequences of cytokine storms and for the treatment of COVID-19 and other systemic, inflammatory events not caused by infection. Because of the complex pathophysiology of sepsis, multiple biomarkers must be analyzed to compensate for the low sensitivity and specificity of single biomarker targets. Conventional LFAs, such as gold nanoparticle dyed assays, are limited to approximately five targets-the maximum number of test lines on an assay. To increase the information obtainable from each test line, we combined green and red emitting quantum dots (QDs) as labels for C-reactive protein (CRP) and interleukin-6 (IL-6) antibodies in an optical duplex immunoassay. CdSe-QDs with sharp and tunable emission bands were used to simultaneously quantify CRP and IL-6 in a single test line, by using a single UV-light source and two suitable emission filters for readout through a widely available BioImager device. For image and data processing, a customized software tool, the MultiFlow-Shiny app was used to accelerate and simplify the readout process. The app software provides advanced tools for image processing, including assisted extraction of line intensities, advanced background correction and an easy workflow for creation and handling of experimental data in quantitative LFAs. The results generated with our MultiFlow-Shiny app were superior to those generated with the popular software ImageJ and resulted in lower detection limits. Our assay is applicable for detecting clinically relevant ranges of both target proteins and therefore may serve as a powerful tool for POC diagnosis of inflammation and infectious events.
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Affiliation(s)
- Christoph Ruppert
- Medical and Life Sciences Faculty, Furtwangen University, Jakob-Kienzle Str. 17, 78054, Villingen-Schwenningen, Germany.,Institute of Precision Medicine, Furtwangen University, Jakob-Kienzle Str. 17, 78054, Villingen-Schwenningen, Germany.,Department of Pharmaceutical Chemistry, Pharmaceutical Institute, University of Tuebingen, Auf der Morgenstelle 8, 72076, Tübingen, Germany
| | - Lars Kaiser
- Medical and Life Sciences Faculty, Furtwangen University, Jakob-Kienzle Str. 17, 78054, Villingen-Schwenningen, Germany.,Institute of Precision Medicine, Furtwangen University, Jakob-Kienzle Str. 17, 78054, Villingen-Schwenningen, Germany.,Institute of Pharmaceutical Sciences, University of Freiburg, Albertstraße 25, 79104, Freiburg, Germany
| | - Lisa Johanna Jacob
- Medical and Life Sciences Faculty, Furtwangen University, Jakob-Kienzle Str. 17, 78054, Villingen-Schwenningen, Germany.,Institute of Precision Medicine, Furtwangen University, Jakob-Kienzle Str. 17, 78054, Villingen-Schwenningen, Germany
| | - Stefan Laufer
- Department of Pharmaceutical Chemistry, Pharmaceutical Institute, University of Tuebingen, Auf der Morgenstelle 8, 72076, Tübingen, Germany
| | - Matthias Kohl
- Medical and Life Sciences Faculty, Furtwangen University, Jakob-Kienzle Str. 17, 78054, Villingen-Schwenningen, Germany. .,Institute of Precision Medicine, Furtwangen University, Jakob-Kienzle Str. 17, 78054, Villingen-Schwenningen, Germany.
| | - Hans-Peter Deigner
- Medical and Life Sciences Faculty, Furtwangen University, Jakob-Kienzle Str. 17, 78054, Villingen-Schwenningen, Germany. .,Institute of Precision Medicine, Furtwangen University, Jakob-Kienzle Str. 17, 78054, Villingen-Schwenningen, Germany. .,EXIM Department, Fraunhofer Institute IZI, Leipzig, Schillingallee 68, 18057, Rostock, Germany. .,Faculty of Science, Tuebingen University, Auf der Morgenstelle 8, 72076, Tübingen, Germany.
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