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Choi Y, Lee S, Lee S, Hong S, Kwon HW. Bioelectronic Tongues Mimicking Insect Taste Systems for Real-Time Discrimination between Natural and Artificial Sweeteners. ACS Sens 2022; 7:3682-3691. [PMID: 36455033 DOI: 10.1021/acssensors.2c01254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
A bioelectronic tongue (B-ET) mimicking insect taste systems is developed for the real-time detection and discrimination of natural and artificial sweeteners. Here, a carbon nanotube field-effect transistor (CNT-FET) was hybridized with nanovesicles including the honeybee sugar taste receptor, gustatory receptor 1 of Apis mellifera (AmGr1). This strategy allowed us to detect glucose, a major component of nectar, down to 100 fM in real time and identify sweet tastants from other tastants. It could also be utilized for the detection of glucose in dextrose tablet solutions. Importantly, we demonstrated the discrimination between natural and artificial sweeteners down to 10 pM even in real beverages such as decaffeinated coffee using our hybrid platform. In this respect, our B-ET mimicking insect taste systems can be a powerful tool for various applications such as food screening and basic studies on insect taste systems.
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Affiliation(s)
- Yoonji Choi
- Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul08826, Republic of Korea
| | - Sujin Lee
- Department of Life Sciences & Convergence Research Center for Insect Vectors, Incheon National University, Incheon22012, Republic of Korea
| | - Seungha Lee
- Department of Life Sciences & Convergence Research Center for Insect Vectors, Incheon National University, Incheon22012, Republic of Korea
| | - Seunghun Hong
- Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul08826, Republic of Korea
| | - Hyung Wook Kwon
- Department of Life Sciences & Convergence Research Center for Insect Vectors, Incheon National University, Incheon22012, Republic of Korea
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El-Hakim Y, Bake S, Mani KK, Sohrabji F. Impact of intestinal disorders on central and peripheral nervous system diseases. Neurobiol Dis 2022; 165:105627. [PMID: 35032636 DOI: 10.1016/j.nbd.2022.105627] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 01/03/2022] [Accepted: 01/09/2022] [Indexed: 12/16/2022] Open
Abstract
Brain injuries and neurological diseases have a significant impact on the gut microbiome and the gut barrier. Reciprocally, gut disorders, such as Inflammatory Bowel Syndromes (IBS), can affect the development and pathology of neurodegenerative and neuropsychiatric diseases, although this aspect is less well studied and is the focus of this review. Inflammatory Bowel Syndrome (IBS) is a chronic and debilitating functional gastrointestinal disorder afflicting an estimated 9-23% of the world's population. A hallmark of this disease is leaky gut, a pathology in which the integrity of the gut blood barrier is compromised, causing gut contents such as immune cells and microbiota to enter the bloodstream leading to low-grade systemic inflammation. The increased levels of inflammation associated cytokines in circulation has the potential to affect all organs, including the brain. Although the brain is protected by the blood brain barrier, inflammation associated cytokines can damage the junctions in this barrier and allow brain infiltration of peripheral immune cells. Central inflammation in the brain is associated with various neurodegenerative disease such as Alzheimer's disease, Parkinson's disease, multiple sclerosis, and neuropsychiatric disorders, namely, depression, and anxiety. Neurodegenerative diseases are of particular concern due to the anticipated rise in the population of the elderly and consequently, the prevalence of these diseases. Additionally, depression and anxiety are the most common mental illnesses affecting roughly 18% of the American population. In this review, we will explore the mechanisms by which IBS can influence the risk and severity of neurological disease.
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Affiliation(s)
- Yumna El-Hakim
- Women's Health in Neuroscience Program, Department of Neuroscience and Experimental Therapeutics, College of Medicine, Texas A&M University-Health Science Center, Bryan, TX, USA
| | - Shameena Bake
- Women's Health in Neuroscience Program, Department of Neuroscience and Experimental Therapeutics, College of Medicine, Texas A&M University-Health Science Center, Bryan, TX, USA
| | - Kathiresh Kumar Mani
- Women's Health in Neuroscience Program, Department of Neuroscience and Experimental Therapeutics, College of Medicine, Texas A&M University-Health Science Center, Bryan, TX, USA
| | - Farida Sohrabji
- Women's Health in Neuroscience Program, Department of Neuroscience and Experimental Therapeutics, College of Medicine, Texas A&M University-Health Science Center, Bryan, TX, USA.
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Lee SH, Lee M, Yang H, Cho Y, Hong S, Park TH. Bioelectronic sensor mimicking the human neuroendocrine system for the detection of hypothalamic-pituitary-adrenal axis hormones in human blood. Biosens Bioelectron 2020; 154:112071. [PMID: 32056965 DOI: 10.1016/j.bios.2020.112071] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 01/27/2020] [Accepted: 02/01/2020] [Indexed: 12/15/2022]
Abstract
In the neuroendocrine system, corticotropin-releasing hormone (CRH) and adrenocorticotropic hormone (ACTH) play important roles in the regulation of the hypothalamic-pituitary-adrenal (HPA) system. Disorders of the HPA system lead to physiological problems, such as Addison's disease and Cushing's syndrome. Therefore, detection of CRH and ACTH is essential for diagnosing disorders related to the HPA system. Herein, receptors of the HPA axis were used to construct a bioelectronic sensor system for the detection of CRH and ACTH. The CRH receptor, corticotropin-releasing hormone receptor 1 (CRHR1), and the ACTH receptor, melanocortin 2 receptor (MC2R), were produced using an Escherichia coli expression system, and were reconstituted using nanodisc (ND) technology. The receptor-embedded NDs were immobilized on a floating electrode of a carbon nanotube field-effect transistor (CNT-FET). The constructed sensors sensitively detected CRH and ACTH to a concentration of 1 fM with high selectivity in real time. Furthermore, the reliable detection of CRH and ACTH in human plasma by the developed sensors demonstrated their potential in clinical and practical applications. These results indicate that CRHR1 and MC2R-based bioelectronic sensors can be applied for rapid and efficient detection of CRH and ACTH.
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Affiliation(s)
- Seung Hwan Lee
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea; Department of Bionano Engineering and Bionanotechnology, Hanyang University, Ansan, 15588, Republic of Korea
| | - Minju Lee
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Republic of Korea
| | - Heehong Yang
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea; Protein Engineering Laboratory, Discovery Unit, MOGAM Institute for Biomedical Research, Yongin, 16924, Republic of Korea
| | - Youngtak Cho
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Republic of Korea
| | - Seunghun Hong
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Republic of Korea.
| | - Tai Hyun Park
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea.
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Lee M, Yang H, Kim D, Yang M, Park TH, Hong S. Human-like smelling of a rose scent using an olfactory receptor nanodisc-based bioelectronic nose. Sci Rep 2018; 8:13945. [PMID: 30224633 PMCID: PMC6141559 DOI: 10.1038/s41598-018-32155-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 09/03/2018] [Indexed: 01/10/2023] Open
Abstract
We report a strategy for the human-like smelling of a rose scent utilizing olfactory receptor nanodisc (ND)-based bioelectronic nose devices. In this strategy, a floating electrode (FE)-based carbon nanotube (CNT) field effect transistor (FET) was functionalized with human olfactory receptor 1A2 (hOR1A2)-embedded NDs (hOR1A2NDs). The hOR1A2NDs responded to rose scent molecules specifically, which were monitored electrically using the underlying CNT-FET. This strategy allowed us to quantitatively assess the contents of geraniol and citronellol, the main components of a rose scent, as low as 1 fM and 10 fM, respectively. In addition, it enabled us to selectively discriminate a specific rose odorant from other odorants. Significantly, we also demonstrated that the responses of hOR1A2NDs to a rose scent could be strongly enhanced by enhancer materials like a human nose. Furthermore, the method provided a means to quantitatively evaluate rose scent components in real samples such as rose oil. Since our method allows one to quantitatively evaluate general rose scent ingredients just like a human nose, it could be a powerful strategy for versatile basic research and various applications such as fragrance development.
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Affiliation(s)
- Minju Lee
- Department of Physics and Astronomy and Institute of Applied Physics, Seoul National University, Seoul, 08826, Korea
| | - Heehong Yang
- School of Chemical and Biological Engineering, Seoul National University, Seoul, 08826, Korea
- Protein Engineering Laboratory, Recombinants Unit, MOGAM Institute for Biomedical Research, Yongin, 16924, Korea
| | - Daesan Kim
- Department of Biophysics and Chemical Biology, Seoul National University, Seoul, 08826, Korea
| | - Myungjae Yang
- Department of Physics and Astronomy and Institute of Applied Physics, Seoul National University, Seoul, 08826, Korea
| | - Tai Hyun Park
- School of Chemical and Biological Engineering, Seoul National University, Seoul, 08826, Korea.
| | - Seunghun Hong
- Department of Physics and Astronomy and Institute of Applied Physics, Seoul National University, Seoul, 08826, Korea.
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Detection of aquaporin-4 antibody using aquaporin-4 extracellular loop-based carbon nanotube biosensor for the diagnosis of neuromyelitis optica. Biosens Bioelectron 2016; 78:87-91. [DOI: 10.1016/j.bios.2015.11.029] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Revised: 11/03/2015] [Accepted: 11/10/2015] [Indexed: 11/21/2022]
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Sachs F. Mechanical transduction by ion channels: A cautionary tale. World J Neurol 2015; 5:74-87. [PMID: 28078202 PMCID: PMC5221657 DOI: 10.5316/wjn.v5.i3.74] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 08/23/2014] [Accepted: 07/17/2015] [Indexed: 02/06/2023] Open
Abstract
Mechanical transduction by ion channels occurs in all cells. The physiological functions of these channels have just begun to be elaborated, but if we focus on the upper animal kingdom, these channels serve the common sensory services such as hearing and touch, provide the central nervous system with information on the force and position of muscles and joints, and they provide the autonomic system with information about the filling of hollow organs such as blood vessels. However, all cells of the body have mechanosensitive channels (MSCs), including red cells. Most of these channels are cation selective and are activated by bilayer tension. There are also K+ selective MSCs found commonly in neurons where they may be responsible for both general anesthesia and knockout punches in the boxing ring by hyperpolarizing neurons to reduce excitability. The cationic MSCs are typically inactive under normal mechanical stress, but open under pathologic stress. The channels are normally inactive because they are shielded from stress by the cytoskeleton. The cationic MSCs are specifically blocked by the externally applied peptide GsMtx4 (aka, AT-300). This is the first drug of its class and provides a new approach to many pathologies since it is nontoxic, non-immunogenic, stable in a biological environment and has a long pharmacokinetic lifetime. Pathologies involving excessive stress are common. They produce cardiac arrhythmias, contraction in stretched dystrophic muscle, xerocytotic and sickled red cells, etc. The channels seem to function primarily as “fire alarms”, providing feedback to the cytoskeleton that a region of the bilayer is under excessive tension and needs reinforcing. The eukaryotic forms of MSCs have only been cloned in recent years and few people have experience working with them. “Newbies” need to become aware of the technology, potential artifacts, and the fundamentals of mechanics. The most difficult problem in studying MSCs is that the actual stimulus, the force applied to the channel, is not known. We don’t have direct access to the channels themselves but only to larger regions of the membrane as seen in patches. Cortical forces are shared by the bilayer, the cytoskeleton and the extracellular matrix. How much of an applied stimulus reaches the channel is unknown. Furthermore, many of these channels exist in spatial domains where the forces within a domain are different from forces outside the domain, although we often hope they are proportional. This review is intended to be a guide for new investigators who want to study mechanosensitive ion channels.
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