Live-Cell Biosensors

A special issue of Biosensors (ISSN 2079-6374). This special issue belongs to the section "Biosensor and Bioelectronic Devices".

Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 3403

Special Issue Editors


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Guest Editor
Institute of Molecular and Cell Biology, Hochschule Mannheim, 68163 Mannheim, Germany
Interests: neuroscience; microcopy; electrophysiology

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Guest Editor
1. Institute of Molecular and Cell Biology, Faculty of Biotechnology, Mannheim University of Applied Sciences, Mannheim, Germany
2. Interdisciplinary Center for Neuroscience, Heidelberg University, Heidelberg, Germany
3. Institute of Toxicology and Genetics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
Interests: neuromuscular junction; 3D cell culture
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Institute Medical Technology - Heidelberg University & University of Applied Sciences Mannheim, 68163 Mannheim, Germany
Interests: calcium signaling; in vitro disease models; organoids

Special Issue Information

Dear Colleagues,

Biosensors couple a bio-receptor to a transducer and a physico-chemical detector in order to transform a specific biological signature or activity into a digital signal. Transducers can be external to the cells, like in electrochemical methods, or can be incorporated into the cells, such as in optogenetic sensors. The detected biological event can be resolved in space at different levels, ranging from subcellular domains and organelles to individual cells and entire cell-population responses. In addition, the time resolution also varies largely between the different techniques available.

Here, we focus on biosensors to measure processes occurring in live cells. Different events can be measured that reflect the cell status or the response to a specific challenge, such as electrical activity, ion concentrations, second messenger dynamics, changes of cell volume and morphology, pH, metabolic and redox state, cell-cycle progression and proliferation, cell death and apoptosis, cell–cell interaction, hormones or neurotransmitters release, and mechanical strain. Optical and electrochemical biosensors may be applied to primary cells, cell lines, iPSCs, and in vivo. Furthermore, they are also a versatile tool in 3D cultures and organoids.

Monitoring biological events in live cells is important not only for basic research but also for drug discovery and development, toxicity screening, disease modelling, as well as clinical diagnostics and treatment. In this context, scientific progress is continuing to increase the content and/or throughput of biosensor-based screening, miniaturization, and application in vivo. 

Dr. Tiziana Cesetti
Prof. Dr. Rüdiger Rudolf
Prof. Dr. Mathias Hafner
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Biosensors is an international peer-reviewed open access monthly journal published by MDPI.

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Keywords

  • live cells
  • electrochemical biosensors
  • optogenetic sensors
  • ions
  • second messengers
  • metabolism
  • neurotransmitters
  • cell cycle
  • cell death
  • screening

Published Papers (1 paper)

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Research

18 pages, 7339 KiB  
Article
Real-Time Analysis of Oxygen Gradient in Oocyte Respiration Using a High-Density Microelectrode Array
by William Tedjo, Yusra Obeidat, Giovana Catandi, Elaine Carnevale and Thomas Chen
Biosensors 2021, 11(8), 256; https://doi.org/10.3390/bios11080256 - 29 Jul 2021
Cited by 2 | Viewed by 2834
Abstract
Physiological events related to oxygen concentration gradients provide valuable information to determine the state of metabolizing biological cells. The existing oxygen sensing methods (i.e., optical photoluminescence, magnetic resonance, and scanning electrochemical) are well-established and optimized for existing in vitro analyses. However, such methods [...] Read more.
Physiological events related to oxygen concentration gradients provide valuable information to determine the state of metabolizing biological cells. The existing oxygen sensing methods (i.e., optical photoluminescence, magnetic resonance, and scanning electrochemical) are well-established and optimized for existing in vitro analyses. However, such methods also present various limitations in resolution, real-time sensing performance, complexity, and costs. An electrochemical imaging system with an integrated microelectrode array (MEA) would offer attractive means of measuring oxygen consumption rate (OCR) based on the cell’s two-dimensional (2D) oxygen concentration gradient. This paper presents an application of an electrochemical sensor platform with a custom-designed complementary-metal-oxide-semiconductor (CMOS)-based microchip and its Pt-coated surface MEA. The high-density MEA provides 16,064 individual electrochemical pixels that cover a 3.6 mm × 3.6 mm area. Utilizing the three-electrode configuration, the system is capable of imaging low oxygen concentration (18.3 µM, 0.58 mg/L, or 13.8 mmHg) at 27.5 µm spatial resolution and up to 4 Hz temporal resolution. In vitro oxygen imaging experiments were performed to analyze bovine cumulus-oocytes-complexes cells OCR and oxygen flux density. The integration of a microfluidic system allows proper bio-sample handling and delivery to the MEA surface for imaging. Finally, the imaging results are processed and presented as 2D heatmaps, representing the dissolved oxygen concentration in the immediate proximity of the MEA. This paper provides the results of real-time 2D imaging of OCR of live cells/tissues to gain spatial and temporal dynamics of target cell metabolism. Full article
(This article belongs to the Special Issue Live-Cell Biosensors)
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