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Ding W, Zhao X, Wang H, Wang Y, Liu Y, Gong L, Lin S, Liu C, Li Y. Effect of Terahertz Electromagnetic Field on the Permeability of Potassium Channel Kv1.2. Int J Mol Sci 2023; 24:10271. [PMID: 37373419 DOI: 10.3390/ijms241210271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 06/10/2023] [Accepted: 06/15/2023] [Indexed: 06/29/2023] Open
Abstract
In this paper, the influence of external terahertz electromagnetic fields with different frequencies of 4 THz, 10 THz, 15 THz, and 20 THz on the permeability of the Kv1.2 voltage-gated potassium ion channel on the nerve cell membrane was studied using the combined model of the "Constant Electric Field-Ion Imbalance" method by molecular dynamics. We found that although the applied terahertz electric field does not produce strong resonance with the -C=O groups of the conservative sequence T-V-G-Y-G amino acid residue of the selective filter (SF) of the channel, it would affect the stability of the electrostatic bond between potassium ions and the carbonyl group of T-V-G-Y-G of SF, and it would affect the stability of the hydrogen bond between water molecules and oxygen atoms of the hydroxyl group of the 374THR side chain at the SF entrance, changing the potential and occupied states of ions in the SF and the occurrence probability of the permeation mode of ions and resulting in the change in the permeability of the channel. Compared with no external electric field, when the external electric field with 15 THz frequency is applied, the lifetime of the hydrogen bond is reduced by 29%, the probability of the "soft knock on" mode is decreased by 46.9%, and the ion flux of the channel is activated by 67.7%. Our research results support the view that compared to "direct knock-on", "soft knock-on" is a slower permeation mode.
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Affiliation(s)
- Wen Ding
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
- School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Xiaofei Zhao
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
- School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Hongguang Wang
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
- School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yize Wang
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
- School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yanjiang Liu
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
- School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Lirong Gong
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
- School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Shu Lin
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
- School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Chunliang Liu
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
- School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yongdong Li
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
- School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China
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Li N, Zhang F. THz-PCR Based on Resonant Coupling between Middle Infrared and DNA Carbonyl Vibrations. ACS APPLIED MATERIALS & INTERFACES 2023; 15:8224-8231. [PMID: 36724344 DOI: 10.1021/acsami.2c22413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The carbonyl groups of deoxyribonucleotide can resonantly couple with 53 THz middle infrared, which can highly transmit water without ionization-based damage to DNA molecules. Herein, we predict that vibrational coupling with THz irradiation could lower down the hybridization landscape of nucleic acids and thus affect DNA replication. Using polymerase chain reaction (PCR) as a measure, we found that THz shining can reduce the denature temperature of DNA duplexes by about 3 °C, which allows one to conduct PCR at lower temperature, facilitating long-time amplification reaction without losing enzymatic fidelity, i.e., normal PCR should be carried out at denaturing temperature ∼4 °C higher than the melting temperature (Tm), but THz-PCR only requires temperature ∼1 °C higher than Tm due to the nonthermal effect of THz shining. Moreover, the melting time can also be shortened to 1/5 due to the enhanced vibration coupling with 53 THz irradiation. We proposed THz-PCR as an innovated DNA amplification technique with ultrahigh specificity and sensitivity and also successfully demonstrated its advantages in forensic detections.
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Affiliation(s)
- Na Li
- Quantum Biophotonic Lab, Key Laboratory of Optical Technology and Instrument for Medicine, Ministry of Education, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Feng Zhang
- Quantum Biophotonic Lab, Key Laboratory of Optical Technology and Instrument for Medicine, Ministry of Education, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
- Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China
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Zhao L, Yi R, Liu S, Chi Y, Tan S, Dong J, Wang H, Zhang J, Wang H, Xu X, Yao B, Wang B, Peng R. Biological responses to terahertz radiation with different power density in primary hippocampal neurons. PLoS One 2023; 18:e0267064. [PMID: 36662735 PMCID: PMC9858065 DOI: 10.1371/journal.pone.0267064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 01/06/2023] [Indexed: 01/21/2023] Open
Abstract
Terahertz (THz) radiation is a valuable imaging and sensing tool which is widely used in industry and medicine. However, it biological effects including genotoxicity and cytotoxicity are lacking of research, particularly on the nervous system. In this study, we investigated how terahertz radiation with 10mW (0.12 THz) and 50 mW (0.157 THz) would affect the morphology, cell growth and function of rat hippocampal neurons in vitro.
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Affiliation(s)
- Li Zhao
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Ruhan Yi
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Sun Liu
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Yunliang Chi
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Shengzhi Tan
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Ji Dong
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Hui Wang
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Jing Zhang
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Haoyu Wang
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Xinping Xu
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Binwei Yao
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Bo Wang
- Central Laboratory, Hainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, Haikou, Hainan, PR China
| | - Ruiyun Peng
- Beijing Institute of Radiation Medicine, Beijing, PR China
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Sun L, Zhao L, Peng RY. Research progress in the effects of terahertz waves on biomacromolecules. Mil Med Res 2021; 8:28. [PMID: 33894781 PMCID: PMC8070290 DOI: 10.1186/s40779-021-00321-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 04/14/2021] [Indexed: 11/13/2022] Open
Abstract
With the rapid development of terahertz technologies, basic research and applications of terahertz waves in biomedicine have attracted increasing attention. The rotation and vibrational energy levels of biomacromolecules fall in the energy range of terahertz waves; thus, terahertz waves might interact with biomacromolecules. Therefore, terahertz waves have been widely applied to explore features of the terahertz spectrum of biomacromolecules. However, the effects of terahertz waves on biomacromolecules are largely unexplored. Although some progress has been reported, there are still numerous technical barriers to clarifying the relation between terahertz waves and biomacromolecules and to realizing the accurate regulation of biological macromolecules by terahertz waves. Therefore, further investigations should be conducted in the future. In this paper, we reviewed terahertz waves and their biomedical research advantages, applications of terahertz waves on biomacromolecules and the effects of terahertz waves on biomacromolecules. These findings will provide novel ideas and methods for the research and application of terahertz waves in the biomedical field.
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Affiliation(s)
- Liu Sun
- Beijing Institute of Radiation Medicine, Haidian District, 27 Taiping Road, Beijing, 100850, China
| | - Li Zhao
- Beijing Institute of Radiation Medicine, Haidian District, 27 Taiping Road, Beijing, 100850, China.
| | - Rui-Yun Peng
- Beijing Institute of Radiation Medicine, Haidian District, 27 Taiping Road, Beijing, 100850, China.
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Ebrahimi B, Keshtgar S. The Effects of EGTA on the Quality of Fresh and Cryopreserved-Thawed Human Spermatozoa. IRANIAN JOURNAL OF MEDICAL SCIENCES 2020; 45:188-198. [PMID: 32546885 PMCID: PMC7253491 DOI: 10.30476/ijms.2019.45787] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Background: Sperm cryopreservation-thawing process has damaging effects on the structure and function of sperm, namely cryoinjury.
Calcium overload has been reported as a postulated mechanism for sperm damage during the first steps after thawing.
This study was designed to assess the intracellular calcium (Ca2+i) after cryopreservation and to clarify the role
of a calcium chelator ethylene glycol-bis (2-aminoethyl ether)-N, N, N′, N′-tetraacetic acid (EGTA) on human sperm quality. Methods: Forty semen samples were obtained from fertile men (March 2017 to 2018). The samples were randomly divided into fresh (F)
and cryopreserved-thawed (CT) groups. The F and CT samples were divided into control and 1 mM EGTA-treated groups.
Sperm kinematics and membrane integrity were assessed. The reactive oxygen species (ROS) and adenosine triphosphate
(ATP) were measured by luminescent methods. Ca2+i, apoptotic rate, and mitochondrial membrane potential (MMP) were
evaluated using flow cytometric methods. Data were compared using SPSS software, version 16.0 by ANOVA and Kruskal-Wallis test. P<0.05 was considered as significant. Results: Cryopreservation decreased sperm motility, viability, membrane integrity, Ca2+i, MMP, and induced cell apoptosis
and ROS production. EGTA could not protect the cryopreserved sperm from cryoinjury. It was found to have destructive
effects on fresh sperm motility and viability (P=0.009) relative to cryopreserved sperm. ATP was reduced (P=0.02)
and ROS production (P=0.0001) was increased in the EGTA-treated F and CT sperms. Conclusion: Despite Ca2+i reduction by EGTA, it had no protective effects on fresh or cryopreserved sperm. We concluded that sperm
cryoinjury was not dependent on calcium overload, and it was suggested that cryoinjury was mainly related to cell membranes damage.
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Affiliation(s)
- Bahareh Ebrahimi
- Department of Physiology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Sara Keshtgar
- Department of Physiology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
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