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Kolesnik OV, Rozhko TV, Kudryasheva NS. Marine Bacteria under Low-Intensity Radioactive Exposure: Model Experiments. Int J Mol Sci 2022; 24:ijms24010410. [PMID: 36613854 PMCID: PMC9820739 DOI: 10.3390/ijms24010410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 12/15/2022] [Accepted: 12/19/2022] [Indexed: 12/28/2022] Open
Abstract
Radioactive contaminants create problems all over world, involving marine ecosystems, with their ecological importance increasing in the future. The review focuses on bioeffects of a series of alpha and beta emitting radioisotopes (americium-241, uranium-(235 + 238), thorium-232, and tritium) and gamma radiation. Low-intensity exposures are under special consideration. Great attention has been paid to luminous marine bacteria as representatives of marine microorganisms and a conventional bioassay system. This bioassay uses bacterial bioluminescence intensity as the main testing physiological parameter; currently, it is widely applied due to its simplicity and sensitivity. Dependences of the bacterial luminescence response on the exposure time and irradiation intensity were reviewed, and applicability of hormetic or threshold models was discussed. A number of aspects of molecular intracellular processes under exposure to low-intensity radiation were analyzed: (a) changes in the rates of enzymatic processes in bacteria with the bioluminescent system of coupled enzymatic reactions of NADH:FMN-oxidoreductase and bacterial luciferase taken as an example; (b) consumption of an intracellular reducer, NADH; (c) active role of reactive oxygen species; (d) repairing of the DNA damage. The results presented confirm the function of humic substances as natural radioprotectors.
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Affiliation(s)
- Olga V. Kolesnik
- Institute of Biophysics SB RAS, Federal Research Center ‘Krasnoyarsk Science Center SB RAS’, 660036 Krasnoyarsk, Russia
- Biophysics Department, Siberian Federal University, 660041 Krasnoyarsk, Russia
| | - Tatiana V. Rozhko
- FSBEI HE V.F. Voino-Yasenetsky KrasSMU MOH, 660022 Krasnoyarsk, Russia
| | - Nadezhda S. Kudryasheva
- Institute of Biophysics SB RAS, Federal Research Center ‘Krasnoyarsk Science Center SB RAS’, 660036 Krasnoyarsk, Russia
- Biophysics Department, Siberian Federal University, 660041 Krasnoyarsk, Russia
- Correspondence:
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Abstract
Tritium is a byproduct of many radiochemical reactions in the nuclear industry, and its effects on aquatic organisms, particularly low-dose effects, deserve special attention. The low-dose effects of tritium on aquatic microbiota have been intensively studied using luminous marine bacteria as model microorganisms. Low-dose physiological activation has been demonstrated and explained by the signaling role of reactive oxygen species through the “bystander effect” in bacterial suspensions. The activation of microbial functions in natural reservoirs by low tritium concentrations can cause unpredictable changes in food chains and imbalances in the natural equilibrium. The incorporation of tritium from the free form into organically bound compounds mainly occurs in the dark and at a temperature of 25 °C. When tritium is ingested by marine animals, up to 56% of tritium is accumulated in the muscle tissue and up to 36% in the liver. About 50% of tritium in the liver is bound in non-exchangeable forms. Human ingestion of water and food products contaminated with background levels of tritium does not significantly contribute to the total dose load on the human body.
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Adaptation of a Bacterial Bioluminescent Assay to Monitor Bioeffects of Gold Nanoparticles. Bioengineering (Basel) 2022; 9:bioengineering9020061. [PMID: 35200414 PMCID: PMC8868574 DOI: 10.3390/bioengineering9020061] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 01/27/2022] [Accepted: 01/30/2022] [Indexed: 11/16/2022] Open
Abstract
Our current study aimed to adapt a bioluminescent bacteria-based bioassay to monitor the bioeffects of gold nanoparticles (AuNPs). Luminous marine bacteria Photobacterium phosphoreum and AuNPs modified with polyvinylpyrrolidone were employed; low-concentration (≤10−3 g/L) bioeffects of AuNPs were studied. Bioluminescence intensity was used as an indicator of physiological activity in bacteria. Two additional methods were used: reactive oxygen species (ROS) content was estimated with a chemiluminescent luminol method, and bacterial size was monitored using electron microscopy. The bacterial bioluminescent response to AuNPs corresponded to the “hormesis” model and involved time-dependent bioluminescence activation, as well as a pronounced increase in the number of enlarged bacteria. We found negative correlations between the time courses of bioluminescence and the ROS content in bacterial suspensions, demonstrating the relationship between bioluminescence activation and bacterial ROS consumption. The combined effects of AuNPs and a beta-emitting radionuclide, tritium, revealed suppression of bacterial bioluminescent activity (as compared to their individual effects) and a reduced percentage of enlarged bacteria. Therefore, we demonstrated that our bacteria-based bioluminescence assay is an appropriate tool to study the bioeffects of AuNPs; the bioeffects can be further classified within a unified framework for rapid bioassessment.
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Kolesnik OV, Rozhko TV, Lapina MA, Solovyev VS, Sachkova AS, Kudryasheva NS. Development of Cellular and Enzymatic Bioluminescent Assay Systems to Study Low-Dose Effects of Thorium. Bioengineering (Basel) 2021; 8:194. [PMID: 34940347 PMCID: PMC8698266 DOI: 10.3390/bioengineering8120194] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 11/20/2021] [Accepted: 11/24/2021] [Indexed: 02/06/2023] Open
Abstract
Thorium is one of the most widespread radioactive elements in natural ecosystems, along with uranium, it is the most important source of nuclear energy. However, the effects of thorium on living organisms have not been thoroughly studied. Marine luminescent bacteria and their enzymes are optimal bioassays for studying low-dose thorium exposures. Luminescent bioassays provide a quantitative measure of toxicity and are characterized by high rates, sensitivity, and simplicity. It is known that the metabolic activity of bacteria is associated with the production of reactive oxygen species (ROS). We studied the effects of thorium-232 (10-11-10-3 M) on Photobacterium phosphoreum and bacterial enzymatic reactions; kinetics of bacterial bioluminescence and ROS content were investigated in both systems. Bioluminescence activation was revealed under low-dose exposures (<0.1 Gy) and discussed in terms of "radiation hormesis". The activation was accompanied by an intensification of the oxidation of a low-molecular reducer, NADH, during the enzymatic processes. Negative correlations were found between the intensity of bioluminescence and the content of ROS in bacteria and enzyme systems; an active role of ROS in the low-dose activation by thorium was discussed. The results contribute to radioecological potential of bioluminescence techniques adapted to study low-intensity radioactive exposures.
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Affiliation(s)
- Olga V. Kolesnik
- Federal Research Center ‘Krasnoyarsk Science Center SB RAS’, Institute of Biophysics SB RAS, 660036 Krasnoyarsk, Russia;
- Biophysics Department, Siberian Federal University, 660041 Krasnoyarsk, Russia;
| | | | - Maria A. Lapina
- Biophysics Department, Siberian Federal University, 660041 Krasnoyarsk, Russia;
| | - Vladislav S. Solovyev
- National Research Tomsk Polytechnic University, 634050 Tomsk, Russia; (V.S.S.); (A.S.S.)
| | - Anna S. Sachkova
- National Research Tomsk Polytechnic University, 634050 Tomsk, Russia; (V.S.S.); (A.S.S.)
| | - Nadezhda S. Kudryasheva
- Federal Research Center ‘Krasnoyarsk Science Center SB RAS’, Institute of Biophysics SB RAS, 660036 Krasnoyarsk, Russia;
- Biophysics Department, Siberian Federal University, 660041 Krasnoyarsk, Russia;
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Li H, Yin Y, Liu J, Lu B, Wan H, Yang L, Wang W, Li R. Hydrogen-rich water attenuates the radiotoxicity induced by tritium exposure in vitro and in vivo. JOURNAL OF RADIATION RESEARCH 2021; 62:34-45. [PMID: 33231266 PMCID: PMC7779358 DOI: 10.1093/jrr/rraa104] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 09/22/2020] [Indexed: 05/10/2023]
Abstract
Radionuclide tritium is widely used in the nuclear energy production industry and creates a threat to human health through radiation exposure. Herein, the radioactive elimination and radioprotective effect of hydrogen-rich water (HRW), a potential antioxidant with various medical applications, on tritiated water (HTO) exposure, was studied in vitro and in vivo. Results showed that intragastric administration of HRW effectively promoted the elimination of urinary tritium, decreased the level of serum tritium and tissue-bound tritium (OBT), and attenuated the genetic damage of blood cells in mice exposed to HTO (18.5 MBq/kg). Pretreatment with HRW effectively reduces tritium accumulation in HTO-treated human blood B lymphocyte AHH-1 cells. In addition, the anti-oxidative properties of HRW could attenuate the increased intracellular ROS (such as O2•-, •OH and ONOO-), resulting in reversing the exhaustion of cellular endogenous antioxidants (reduced GSH and SOD), decreasing lipid peroxidation (MDA), relieving DNA oxidative damage, and depressing cell apoptosis and cytotoxicity induced by HTO exposure. In conclusion, HRW is expected to be an effective radioactive elimination agent through the competition effect of isotope exchange or a radioprotective agent by scavenging free radicals induced by HTO exposure.
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Affiliation(s)
- Hong Li
- Centre for Diseases Prevention and Control of Eastern Theater, Nanjing 210002, China
- State Key Laboratory of Trauma Burns and Combined Injury, Institute of Combined Injury, Chongqing Engineering Research Center for Nanomedicine, College of Preventive Medicine, Army Medical University, Chongqing 400038, China
| | - Yaru Yin
- State Key Laboratory of Trauma Burns and Combined Injury, Institute of Combined Injury, Chongqing Engineering Research Center for Nanomedicine, College of Preventive Medicine, Army Medical University, Chongqing 400038, China
| | - Jing Liu
- State Key Laboratory of Trauma Burns and Combined Injury, Institute of Combined Injury, Chongqing Engineering Research Center for Nanomedicine, College of Preventive Medicine, Army Medical University, Chongqing 400038, China
| | - Binghui Lu
- State Key Laboratory of Trauma Burns and Combined Injury, Institute of Combined Injury, Chongqing Engineering Research Center for Nanomedicine, College of Preventive Medicine, Army Medical University, Chongqing 400038, China
| | - Huimin Wan
- State Key Laboratory of Trauma Burns and Combined Injury, Institute of Combined Injury, Chongqing Engineering Research Center for Nanomedicine, College of Preventive Medicine, Army Medical University, Chongqing 400038, China
| | - Luxun Yang
- State Key Laboratory of Trauma Burns and Combined Injury, Institute of Combined Injury, Chongqing Engineering Research Center for Nanomedicine, College of Preventive Medicine, Army Medical University, Chongqing 400038, China
| | - Weidong Wang
- Department of Radiation Oncology, Sichuan Cancer Hospital, Chengdu 610041, China
| | - Rong Li
- State Key Laboratory of Trauma Burns and Combined Injury, Institute of Combined Injury, Chongqing Engineering Research Center for Nanomedicine, College of Preventive Medicine, Army Medical University, Chongqing 400038, China
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Rozhko TV, Nemtseva EV, Gardt MV, Raikov AV, Lisitsa AE, Badun GA, Kudryasheva NS. Enzymatic Responses to Low-Intensity Radiation of Tritium. Int J Mol Sci 2020; 21:E8464. [PMID: 33187108 PMCID: PMC7696592 DOI: 10.3390/ijms21228464] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Revised: 11/06/2020] [Accepted: 11/09/2020] [Indexed: 12/12/2022] Open
Abstract
The present study considers a possible role of enzymatic reactions in the adaptive response of cells to the beta-emitting radionuclide tritium under conditions of low-dose exposures. Effects of tritiated water (HTO) on the reactions of bacterial luciferase and NAD(P)H:FMN-oxidoreductase, as well as a coupled system of these two reactions, were studied at radioactivity concentrations ≤ 200 MBq/L. Additionally, one of the simplest enzymatic reactions, photobiochemical proton transfer in Coelenteramide-containing Fluorescent Protein (CLM-FP), was also investigated. We found that HTO increased the activity of NAD(P)H:FMN-oxidoreductase at the initial stage of its reaction (by up to 230%); however, a rise of luciferase activity was moderate (<20%). The CLM-FP samples did not show any increase in the rate of the photobiochemical proton transfer under the exposure to HTO. The responses of the enzyme systems were compared to the 'hormetic' response of luminous marine bacterial cells studied earlier. We conclude that (1) the oxidoreductase reaction contributes significantly to the activation of the coupled enzyme system and bacterial cells by tritium, and (2) an increase in the organization level of biological systems promotes the hormesis phenomenon.
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Affiliation(s)
- Tatiana V. Rozhko
- Department of Medical and Biological Physics, Krasnoyarsk State Medical Academy, 660022 Krasnoyarsk, Russia
| | - Elena V. Nemtseva
- Biophysics Department, Siberian Federal University, 660041 Krasnoyarsk, Russia; (E.V.N.); (M.V.G.); (A.V.R.); (A.E.L.); (N.S.K.)
- Institute of Biophysics SB RAS, FRC KSC SB RAS, 660036 Krasnoyarsk, Russia
| | - Maria V. Gardt
- Biophysics Department, Siberian Federal University, 660041 Krasnoyarsk, Russia; (E.V.N.); (M.V.G.); (A.V.R.); (A.E.L.); (N.S.K.)
| | - Alexander V. Raikov
- Biophysics Department, Siberian Federal University, 660041 Krasnoyarsk, Russia; (E.V.N.); (M.V.G.); (A.V.R.); (A.E.L.); (N.S.K.)
| | - Albert E. Lisitsa
- Biophysics Department, Siberian Federal University, 660041 Krasnoyarsk, Russia; (E.V.N.); (M.V.G.); (A.V.R.); (A.E.L.); (N.S.K.)
| | - Gennadii A. Badun
- Department of Chemistry, Moscow State University, 119991 Moscow, Russia;
| | - Nadezhda S. Kudryasheva
- Biophysics Department, Siberian Federal University, 660041 Krasnoyarsk, Russia; (E.V.N.); (M.V.G.); (A.V.R.); (A.E.L.); (N.S.K.)
- Institute of Biophysics SB RAS, FRC KSC SB RAS, 660036 Krasnoyarsk, Russia
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7
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Humic Substances Mitigate the Impact of Tritium on Luminous Marine Bacteria. Involvement of Reactive Oxygen Species. Int J Mol Sci 2020; 21:ijms21186783. [PMID: 32947870 PMCID: PMC7556015 DOI: 10.3390/ijms21186783] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Revised: 09/10/2020] [Accepted: 09/15/2020] [Indexed: 11/16/2022] Open
Abstract
The paper studies the combined effects of beta-emitting radionuclide tritium and Humic Substances (HS) on the marine unicellular microorganism—luminous bacteria—under conditions of low-dose radiation exposures (<0.04 Gy). Tritium was used as a component of tritiated water. Bacterial luminescence intensity was considered as a tested physiological parameter. The bioluminescence response of the marine bacteria to tritium corresponded to the “hormesis” model: it included stages of bioluminescence inhibition and activation, as well as the absence of the effect. HS were shown to decrease the inhibition and activation effects of tritium, similar to those of americium-241, alpha-emitting radionuclide, studied earlier. Correlations between the bioluminescence intensity and the content of Reactive Oxygen Species (ROS) were found in the radioactive bacterial suspensions. The results demonstrate an important role of HS in natural processes in the regions of low radioactive contamination: HS can mitigate radiotoxic effects and adaptive response of microorganisms to low-dose radioactive exposures. The involvement of ROS in these processes was demonstrated.
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Rozhko TV, Nogovitsyna EI, Badun GA, Lukyanchuk AN, Kudryasheva NS. Reactive Oxygen Species and low-dose effects of tritium on bacterial cells. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2019; 208-209:106035. [PMID: 31499317 DOI: 10.1016/j.jenvrad.2019.106035] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 08/22/2019] [Accepted: 08/22/2019] [Indexed: 06/10/2023]
Abstract
The paper continues study of exposures of luminous marine bacteria to low-dose radiation of tritium; tritiated water (HTO) was applied as a source of the irradiation. Hypothesis on involvement of Reactive Oxygen Species (ROS) to signaling mechanism of bacterial cells under exposure to low-intensity tritium radiation was verified. Bacterial bioluminescence intensity was considered as a tested physiological parameter; it was compared to the ROS production in the bacterial environment of different activity concentrations: 0.03, 4.0, and 500 MBq/L. Exposure of the bacteria to chronic low-dose tritium irradiation (<0.08 Gy) increased bioluminescence intensity and ROS production considerably (up to 300%). Spearman rank correlation coefficients were calculated and confirmed relations between the bioluminescence intensity and ROS production. Additional peculiarities of HTO effect were: independence of the bioluminescence intensity and ROS content on HTO activity concentration; low ROS content in bacteria-free aquatic environment. Effects of HTO on bacterial bioluminescence were attributed to: (1) trigger function of tritium decay products in the bacterial metabolic oxygen-dependent processes, with bioluminescence involved; (2) signaling role of ROS as intercellular messengers in "bystander effect"; (3) fixed amount of bacterial cells (3•107 cells/mL) provided the upper limits of the bioluminescence intensity and ROS content. As an outlook, in spite of low energy of tritium decay, its influence on aquatic biota via ROS production by microorganisms should be taken into consideration.
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Affiliation(s)
- Tatiana V Rozhko
- Krasnoyarsk State Medical University, P.Zheleznyaka 1, Krasnoyarsk, 660022, Russia.
| | | | - Gennady A Badun
- Moscow State University, Department of Chemistry, Moscow, 119991, Russia
| | | | - Nadezhda S Kudryasheva
- Siberian Federal University, Krasnoyarsk, 660041, Russia; Institute of Biophysics SB RAS, Federal Research Center 'Krasnoyarsk Science Center SB RAS', 50/50 Akademgorodok, Krasnoyarsk, 660036, Russia
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9
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Kudryasheva NS, Kovel ES. Monitoring of Low-Intensity Exposures via Luminescent Bioassays of Different Complexity: Cells, Enzyme Reactions, and Fluorescent Proteins. Int J Mol Sci 2019; 20:E4451. [PMID: 31509958 PMCID: PMC6770735 DOI: 10.3390/ijms20184451] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2019] [Revised: 09/01/2019] [Accepted: 09/04/2019] [Indexed: 02/06/2023] Open
Abstract
The current paper reviews the applications of luminescence bioassays for monitoring the results of low-intensity exposures which produce a stimulative effect. The impacts of radioactivity of different types (alpha, beta, and gamma) and bioactive compounds (humic substances and fullerenols) are under consideration. Bioassays based on luminous marine bacteria, their enzymes, and fluorescent coelenteramide-containing proteins were used to compare the results of the low-intensity exposures at the cellular, biochemical, and physicochemical levels, respectively. High rates of luminescence response can provide (1) a proper number of experimental results under comparable conditions and, therefore, proper statistical processing, with this being highly important for "noisy" low-intensity exposures; and (2) non-genetic, i.e., biochemical and physicochemical mechanisms of cellular response for short-term exposures. The results of cellular exposures were discussed in terms of the hormesis concept, which implies low-dose stimulation and high-dose inhibition of physiological functions. Dependencies of the luminescence response on the exposure time or intensity (radionuclide concentration/gamma radiation dose rate, concentration of the bioactive compounds) were analyzed and compared for bioassays of different organization levels.
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Affiliation(s)
- Nadezhda S Kudryasheva
- Institute of Biophysics, Federal Research Center "Krasnoyarsk Science Center, Russian Academy of Sciences, Siberian Branch", Krasnoyarsk 660036, Russia.
- Siberian Federal University, Krasnoyarsk 660041, Russia.
| | - Ekaterina S Kovel
- Institute of Biophysics, Federal Research Center "Krasnoyarsk Science Center, Russian Academy of Sciences, Siberian Branch", Krasnoyarsk 660036, Russia
- Institute of Physics, Federal Research Center "Krasnoyarsk Science Center, Russian Academy of Sciences, Siberian Branch", Krasnoyarsk 660036, Russia
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10
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Petrova AS, Lukonina AA, Dementyev DV, Ya Bolsunovsky A, Popov AV, Kudryasheva NS. Protein-based fluorescent bioassay for low-dose gamma radiation exposures. Anal Bioanal Chem 2018; 410:6837-6844. [PMID: 30062510 DOI: 10.1007/s00216-018-1282-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 07/10/2018] [Accepted: 07/17/2018] [Indexed: 01/30/2023]
Abstract
The study suggests an application of a coelenteramide-containing fluorescent protein (CLM-CFP) as a simplest bioassay for gamma radiation exposures. "Discharged obelin," a product of the bioluminescence reaction of the marine coelenterate Obelia longissima, was used as a representative of the CLM-CFP group. The bioassay is based on a simple enzymatic reaction-photochemical proton transfer in the coelenteramide-apoprotein complex. Components of this reaction differ in fluorescence color, providing, by this, an evaluation of the proton transfer efficiency in the photochemical process. This efficiency depends on the microenvironment of the coelenteramide within the protein complex, and, hence, can evaluate a destructive ability of gamma radiation. The CLM-CFP samples were exposed to gamma radiation (137Cs, 2 mGy/h) for 7 and 16 days at 20 °C and 5 °C, respectively. As a result, two fluorescence characteristics (overall fluorescence intensity and contributions of color components to the fluorescence spectra) were identified as bioassay parameters. Both parameters demonstrated high sensitivity of the CLM-CFP-based bioassay to the low-dose gamma radiation exposure (up to 100 mGy). Higher temperature (20 °C) enhanced the response of CLM-CFP to gamma radiation. This new bioassay can provide fluorescent multicolor assessment of protein destruction in cells and physiological liquids under exposure to low doses of gamma radiation. Graphical abstract ᅟ.
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Affiliation(s)
- Alena S Petrova
- Krasnoyarsk State Agrarian University, Mira Avenue 90, Krasnoyarsk, 660049, Russia
| | - Anna A Lukonina
- Siberian Federal University, Svobodnyy Ave 79, Krasnoyarsk, 660041, Russia
| | - Dmitry V Dementyev
- Institute of Biophysics SB RAS, FRC KSC SB RAS, Krasnoyarsk, 660036, Russia
| | | | - Anatoliy V Popov
- Department of Radiology, University of Pennsylvania, 3401 N Broad St., Philadelphia, PA, 19140, USA
| | - Nadezhda S Kudryasheva
- Siberian Federal University, Svobodnyy Ave 79, Krasnoyarsk, 660041, Russia. .,Institute of Biophysics SB RAS, FRC KSC SB RAS, Krasnoyarsk, 660036, Russia.
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11
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Rozhko TV, Guseynov OA, Guseynova VE, Bondar AA, Devyatlovskaya AN, Kudryasheva NS. Is bacterial luminescence response to low-dose radiation associated with mutagenicity? JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2017; 177:261-265. [PMID: 28728127 DOI: 10.1016/j.jenvrad.2017.07.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 06/30/2017] [Accepted: 07/10/2017] [Indexed: 06/07/2023]
Abstract
Luminous marine bacteria are widely used in bioassays with luminescence intensity being a physiological parameter tested. The purpose of the study was to determine whether bacterial genetic alteration is responsible for bioluminescence kinetics change under low-dose radiation exposure. The alpha-emitting radionuclide 241Am and beta-emitting radionuclide 3H were used as the sources of low-dose ionizing radiation. Changes of bioluminescence kinetics of Photobacterium phosphoreum in solutions of 241Am(NO3)3, 7 kBq/L, and tritiated water, 100 MBq/L, were studied; bioluminescence kinetics stages (absence of effect, activation, and inhibition) were determined. Bacterial suspension was sampled at different stages of the bioluminescent kinetics; the doses accumulated by the samples were close or a little higher than a tentative limit of a low-dose interval: 0.10 and 0.85 Gy for 241Am, or 0.11 and 0.18 Gy for 3H. Sequence analysis of the 16S ribosomal RNA gene did not reveal a mutagenic effect of low-dose alpha and beta radiation in the bacterial samples. Previous results on bacterial DNA exposed to low-dose gamma radiation (0.25 Gy) were analyzed and compared to those for alpha and beta irradiation. It is concluded that bioluminescence activation and/or inhibition under the applied conditions of low-dose alpha, beta and gamma radioactive exposure is not associated with DNA mutations in the gene sequences tested.
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Affiliation(s)
- T V Rozhko
- Krasnoyarsk State Medical Academy, 1 P.Zheleznyaka, Krasnoyarsk, 660022, Russia
| | - O A Guseynov
- Siberian Federal University, 79 Svobodny Prospect, Krasnoyarsk, 660041, Russia
| | - V E Guseynova
- Siberian Federal University, 79 Svobodny Prospect, Krasnoyarsk, 660041, Russia
| | - A A Bondar
- SB RAS Genomics Core Facility, Institute of Chemical Biology and Fundamental Medicine SB RAS, 8 Lavrentiev Avenue, Novosibirsk, 630090, Russia
| | - A N Devyatlovskaya
- Siberian State Technological University, LB, 29 Pobedy, Lesosibirsk, Krasnoyarsk Region, 662543, Russia
| | - N S Kudryasheva
- Siberian Federal University, 79 Svobodny Prospect, Krasnoyarsk, 660041, Russia; Institute of Biophysics SB RAS, Federal Research Center 'Krasnoyarsk Science Center SB RAS', 50/50 Akademgorodok, Krasnoyarsk, 660036, Russia.
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12
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Petrova AS, Lukonina AA, Badun GA, Kudryasheva NS. Fluorescent coelenteramide-containing protein as a color bioindicator for low-dose radiation effects. Anal Bioanal Chem 2017; 409:4377-4381. [PMID: 28527000 DOI: 10.1007/s00216-017-0404-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2017] [Revised: 04/13/2017] [Accepted: 05/09/2017] [Indexed: 01/28/2023]
Abstract
The study addresses the application of fluorescent coelenteramide-containing proteins as color bioindicators for radiotoxicity evaluation. Biological effects of chronic low-dose radiation are under investigation. Tritiated water (200 MBq/L) was used as a model source of low-intensive ionizing radiation of beta type. 'Discharged obelin,' product of bioluminescent reaction of marine coelenterate Obelia longissimi, was used as a representative of the coelenteramide-containing proteins. Coelenteramide, fluorophore of discharged obelin, is a photochemically active molecule; it produces fluorescence forms of different color. Contributions of 'violet' and 'blue-green' forms to the visible fluorescence serve as tested parameters. The contributions depend on the coelenteramide's microenvironment in the protein, and, hence, evaluate distractive ability and toxicity of radiation. The protein samples were exposed to beta radiation for 18 days, and maximal dose accumulated by the samples was 0.28 Gy, being close to a tentative limit of a low-dose interval. Increase of relative contribution of 'violet' fluorescence under exposure to the beta irradiation was revealed. High sensitivity of the protein-based test system to low-dose ionizing radiation (to 0.03 Gy) was demonstrated. The study develops physicochemical understanding of radiotoxic effects. Graphical abstract Coelenteramide-containing protein (discharged obelin) changes fluorescence color under exposure to low-dose ionizing radiation of tritium.
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Affiliation(s)
- Alena S Petrova
- Institute of Biophysics SB RAS, FRC KSC SB RAS, Akademgorodok 50, Krasnoyarsk, 660036, Russia.,Krasnoyarsk State Agrarian University, Krasnoyarsk, 660049, Russia
| | - Anna A Lukonina
- Institute of Biophysics SB RAS, FRC KSC SB RAS, Akademgorodok 50, Krasnoyarsk, 660036, Russia.,Siberian Federal University, Krasnoyarsk, 660041, Russia
| | | | - Nadezhda S Kudryasheva
- Institute of Biophysics SB RAS, FRC KSC SB RAS, Akademgorodok 50, Krasnoyarsk, 660036, Russia. .,Siberian Federal University, Krasnoyarsk, 660041, Russia.
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13
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Alieva RR, Kudryasheva NS. Variability of fluorescence spectra of coelenteramide-containing proteins as a basis for toxicity monitoring. Talanta 2017; 170:425-431. [PMID: 28501192 DOI: 10.1016/j.talanta.2017.04.043] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2017] [Revised: 04/10/2017] [Accepted: 04/16/2017] [Indexed: 11/30/2022]
Abstract
Nowadays, physicochemical approach to understanding toxic effects remains underdeveloped. A proper development of such mode would be concerned with simplest bioassay systems. Coelenteramide-Containing Fluorescent Proteins (CLM-CFPs) can serve as proper tools for study primary physicochemical processes in organisms under external exposures. CLM-CFPs are products of bioluminescent reactions of marine coelenterates. As opposed to Green Fluorescent Proteins, the CLM-CFPs are not widely applied in biomedical research, and their potential as colored biomarkers is undervalued now. Coelenteramide, fluorophore of CLM-CFPs, is a photochemically active molecule; it acts as a proton donor in its electron-excited states, generating several forms of different fluorescent state energy and, hence, different fluorescence color, from violet to green. Contributions of the forms to the visible fluorescence depend on the coelenteramide microenvironment in proteins. Hence, CLM-CFPs can serve as fluorescence biomarkers with color differentiation to monitor results of destructive biomolecule exposures. The paper reviews experimental and theoretical studies of spectral-luminescent and photochemical properties of CLM-CFPs, as well as their variation under different exposures - chemicals, temperature, and ionizing radiation. Application of CLM-CFPs as toxicity bioassays of a new type is justified.
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Affiliation(s)
- Roza R Alieva
- Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Akademgorodok 50/50, Krasnoyarsk 660036, Russia; Siberian Federal University, Svobodny Prospect 79, Krasnoyarsk 660041, Russia
| | - Nadezhda S Kudryasheva
- Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Akademgorodok 50/50, Krasnoyarsk 660036, Russia; Siberian Federal University, Svobodny Prospect 79, Krasnoyarsk 660041, Russia
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14
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Kudryasheva NS, Petrova AS, Dementyev DV, Bondar AA. Exposure of luminous marine bacteria to low-dose gamma-radiation. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2017; 169-170:64-69. [PMID: 28086187 DOI: 10.1016/j.jenvrad.2017.01.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2016] [Revised: 12/18/2016] [Accepted: 01/03/2017] [Indexed: 06/06/2023]
Abstract
The study addresses biological effects of low-dose gamma-radiation. Radioactive 137Cs-containing particles were used as model sources of gamma-radiation. Luminous marine bacterium Photobacterium phosphoreum was used as a bioassay with the bioluminescent intensity as the physiological parameter tested. To investigate the sensitivity of the bacteria to the low-dose gamma-radiation exposure (≤250 mGy), the irradiation conditions were varied as follows: bioluminescence intensity was measured at 5, 10, and 20°С for 175, 100, and 47 h, respectively, at different dose rates (up to 4100 μGy/h). There was no noticeable effect of gamma-radiation at 5 and 10°С, while the 20°С exposure revealed authentic bioluminescence inhibition. The 20°С results of gamma-radiation exposure were compared to those for low-dose alpha- and beta-radiation exposures studied previously under comparable experimental conditions. In contrast to ionizing radiation of alpha and beta types, gamma-emission did not initiate bacterial bioluminescence activation (adaptive response). As with alpha- and beta-radiation, gamma-emission did not demonstrate monotonic dose-effect dependencies; the bioluminescence inhibition efficiency was found to be related to the exposure time, while no dose rate dependence was found. The sequence analysis of 16S ribosomal RNA gene did not reveal a mutagenic effect of low-dose gamma radiation. The exposure time that caused 50% bioluminescence inhibition was suggested as a test parameter for radiotoxicity evaluation under conditions of chronic low-dose gamma irradiation.
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Affiliation(s)
- N S Kudryasheva
- Institute of Biophysics SB RAS, Federal Research Center 'Krasnoyarsk Science Center SB RAS', 50/50 Akademgorodok, Krasnoyarsk, 660036, Russia; Siberian Federal University, 79 Svobodny Prospect, Krasnoyarsk, 660041, Russia.
| | - A S Petrova
- Institute of Biophysics SB RAS, Federal Research Center 'Krasnoyarsk Science Center SB RAS', 50/50 Akademgorodok, Krasnoyarsk, 660036, Russia; Krasnoyarsk State Agrarian University, 90 Mira Prospect, Krasnoyarsk, 660049, Russia
| | - D V Dementyev
- Institute of Biophysics SB RAS, Federal Research Center 'Krasnoyarsk Science Center SB RAS', 50/50 Akademgorodok, Krasnoyarsk, 660036, Russia
| | - A A Bondar
- SB RAS Genomics Core Facility, Institute of Chemical Biology and Fundamental Medicine SB RAS, Novosibirsk, 630090, Russia
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15
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On mechanism of antioxidant effect of fullerenols. Biochem Biophys Rep 2016; 9:1-8. [PMID: 28955983 PMCID: PMC5614482 DOI: 10.1016/j.bbrep.2016.10.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2016] [Revised: 10/12/2016] [Accepted: 10/21/2016] [Indexed: 12/11/2022] Open
Abstract
Fullerenols are nanosized water-soluble polyhydroxylated derivatives of fullerenes, specific allotropic form of carbon, bioactive compounds and perspective pharmaceutical agents. Antioxidant activity of fullerenols was studied in model solutions of organic and inorganic toxicants of oxidative type - 1,4-benzoquinone and potassium ferricyanide. Two fullerenol preparations were tested: С60О2-4(ОН)20-24 and mixture of two types of fullerenols С60О2-4(ОН)20-24+С70О2-4(ОН)20-24. Bacteria-based and enzyme-based bioluminescent assays were used to evaluate a decrease in cellular and biochemical toxicities, respectively. Additionally, the enzyme-based assay was used for the direct monitoring of efficiency of the oxidative enzymatic processes. The bacteria-based and enzyme-based assays showed similar peculiarities of the detoxification processes: (1) ultralow concentrations of fullerenols were active (ca 10-17-10-4 and 10-17-10-5 g/L, respectively), (2) no monotonic dependence of detoxification efficiency on fullerenol concentrations was observed, and (3) detoxification of organic oxidizer solutions was more effective than that of the inorganic oxidizer. The antioxidant effect of highly diluted fullerenol solutions on bacterial cells was attributed to hormesis phenomenon; the detoxification was concerned with stimulation of adaptive cellular response under low-dose exposures. Sequence analysis of 16S ribosomal RNA was carried out; it did not reveal mutations in bacterial DNA. The suggestion was made that hydrophobic membrane-dependent processes are involved to the detoxifying mechanism. Catalytic activity of fullerenol (10-8 g/L) in NADH-dependent enzymatic reactions was demonstrated and supposed to contribute to adaptive bacterial response.
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