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Abstract
Endogenous photosensitizers play a critical role in both beneficial and harmful light-induced transformations in biological systems. Understanding their mode of action is essential for advancing fields such as photomedicine, photoredox catalysis, environmental science, and the development of sun care products. This review offers a comprehensive analysis of endogenous photosensitizers in human skin, investigating the connections between their electronic excitation and the subsequent activation or damage of organic biomolecules. We gather the physicochemical and photochemical properties of key endogenous photosensitizers and examine the relationships between their chemical reactivity, location within the skin, and the primary biochemical events following solar radiation exposure, along with their influence on skin physiology and pathology. An important take-home message of this review is that photosensitization allows visible light and UV-A radiation to have large effects on skin. The analysis presented here unveils potential causes for the continuous increase in global skin cancer cases and emphasizes the limitations of current sun protection approaches.
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Affiliation(s)
- Erick L Bastos
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, 05508-000 São Paulo, São Paulo, Brazil
| | - Frank H Quina
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, 05508-000 São Paulo, São Paulo, Brazil
- Department of Chemical Engineering, Polytechnic School, University of São Paulo, 05508-000 São Paulo, São Paulo, Brazil
| | - Maurício S Baptista
- Department of Biochemistry, Institute of Chemistry, University of São Paulo, 05508-000 São Paulo, São Paulo, Brazil
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2
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Fragou F, Theofanous A, Deligiannakis Y, Louloudi M. Nanoantioxidant Materials: Nanoengineering Inspired by Nature. MICROMACHINES 2023; 14:383. [PMID: 36838085 PMCID: PMC9963756 DOI: 10.3390/mi14020383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 01/14/2023] [Accepted: 01/16/2023] [Indexed: 06/18/2023]
Abstract
Oxidants are very active compounds that can cause damage to biological systems under specific environmental conditions. One effective way to counterbalance these adverse effects is the use of anti-oxidants. At low concentrations, an antioxidant is defined as a compound that can delay, control, or prevent an oxidative process. Antioxidants exist in plants, soil, and minerals; therefore, nature is a rich source of natural antioxidants, such as tocopherols and polyphenols. In nature, antioxidants perform in tandem with their bio-environment, which may tune their activity and protect them from degradation. In vitro use of antioxidants, i.e., out of their biomatrix, may encounter several drawbacks, such as auto-oxidation and polymerization. Artificial nanoantioxidants can be developed via surface modification of a nanoparticle with an antioxidant that can be either natural or synthetic, directly mimicking a natural antioxidant system. In this direction, state-of-the-art nanotechnology has been extensively incorporated to overcome inherent drawbacks encountered in vitro use of antioxidants, i.e., out of their biomatrix, and facilitate the production and use of antioxidants on a larger scale. Biomimetic nanoengineering has been adopted to optimize bio-medical antioxidant systems to improve stability, control release, enhance targeted administration, and overcome toxicity and biocompatibility issues. Focusing on biotechnological sciences, this review highlights the importance of nanoengineering in developing effective antioxidant structures and comparing the effectiveness of different nanoengineering methods. Additionally, this study gathers and clarifies the different antioxidant mechanisms reported in the literature and provides a clear picture of the existing evaluation methods, which can provide vital insights into bio-medical applications.
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Affiliation(s)
- Fotini Fragou
- Laboratory of Biomimetic Catalysis & Hybrid Materials, Department of Chemistry, University of Ioannina, GR-45110 Ioannina, Greece
| | - Annita Theofanous
- Laboratory of Biomimetic Catalysis & Hybrid Materials, Department of Chemistry, University of Ioannina, GR-45110 Ioannina, Greece
| | - Yiannis Deligiannakis
- Laboratory of Physical Chemistry of Materials & Environment, Department of Physics, University of Ioannina, GR-45110 Ioannina, Greece
| | - Maria Louloudi
- Laboratory of Biomimetic Catalysis & Hybrid Materials, Department of Chemistry, University of Ioannina, GR-45110 Ioannina, Greece
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3
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Yuan C, Wang H, Li X, Liu H, Zhao J, Lu W, Wang J. Combined Effect of Flaxseed Oil and Vitamin E Supplementation During Bull Semen Cryopreservation on Sperm Characteristics. Biopreserv Biobank 2021; 20:520-528. [PMID: 34919423 DOI: 10.1089/bio.2021.0059] [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: 11/13/2022] Open
Abstract
The present study was performed to investigate the effects of supplementing flaxseed oil (FO) or vitamin E (VE) or their combination to an extender for Simmental bull semen cryopreservation. In experiment 1, different concentrations of FO (0, 10, 100, and 1000 ng/mL) and VE (0.05, 0.1, and 0.2 mg/mL) were added to the extenders. In experiment 2, FO, VE, and FO + VE were added and a control group was included. Sperm viability, motility, motion parameters, acrosome integrity and membrane integrity, endogenous antioxidant indices, reactive oxygen species, and malondialdehyde levels were evaluated after semen thawing. A higher percentage of viability, motion parameters, endogenous antioxidant indices, and membrane integrity was observed after supplementation with 10 ng/mL FO or 0.1 mg/mL VE compared with the control group (p < 0.05). Also, combined supplementation of 10 ng/mL FO +0.1 mg/mL VE further improved the quality of frozen-thawed sperm by regulating viability, motion parameters, membrane integrity, and endogenous antioxidant indices compared with the FO or VE alone (p < 0.05). These results indicated that FO (10 ng/mL) + VE (0.1 mg/mL) could further improve the protective effects on bull sperm post-thaw.
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Affiliation(s)
- Chongshan Yuan
- Joint Laboratory of the Modern Agricultural Technology International Cooperation, Ministry of Education, Jilin Agricultural University, Changchun, China.,Key Lab of the Animal Production, Product Quality, and Security, Ministry of Education, Jilin Agricultural University, Changchun, China
| | - Hongtao Wang
- Joint Laboratory of the Modern Agricultural Technology International Cooperation, Ministry of Education, Jilin Agricultural University, Changchun, China.,Key Lab of the Animal Production, Product Quality, and Security, Ministry of Education, Jilin Agricultural University, Changchun, China
| | - Xichun Li
- Changchun Xinmu Sciences and Technologies Co., Ltd, Changchun, China
| | - Hongyu Liu
- Joint Laboratory of the Modern Agricultural Technology International Cooperation, Ministry of Education, Jilin Agricultural University, Changchun, China.,Key Lab of the Animal Production, Product Quality, and Security, Ministry of Education, Jilin Agricultural University, Changchun, China
| | - Jing Zhao
- Joint Laboratory of the Modern Agricultural Technology International Cooperation, Ministry of Education, Jilin Agricultural University, Changchun, China.,Key Lab of the Animal Production, Product Quality, and Security, Ministry of Education, Jilin Agricultural University, Changchun, China
| | - Wenfa Lu
- Joint Laboratory of the Modern Agricultural Technology International Cooperation, Ministry of Education, Jilin Agricultural University, Changchun, China.,Key Lab of the Animal Production, Product Quality, and Security, Ministry of Education, Jilin Agricultural University, Changchun, China
| | - Jun Wang
- Joint Laboratory of the Modern Agricultural Technology International Cooperation, Ministry of Education, Jilin Agricultural University, Changchun, China.,Key Lab of the Animal Production, Product Quality, and Security, Ministry of Education, Jilin Agricultural University, Changchun, China
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4
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Xie M, Hua Y, Hong D, Wan S, Tian Y. Physical insights into protection effect of conjugated polymers by natural antioxidants. RSC Adv 2021; 11:1614-1622. [PMID: 35424094 PMCID: PMC8693752 DOI: 10.1039/d0ra09657a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 12/17/2020] [Indexed: 11/21/2022] Open
Abstract
Conjugated polymers (CPs) known as organic semiconductors have been broadly applied in photovoltaic and light emitting devices due to their easy fabrication and flexibility. However, one of the bottlenecks limiting the application of CPs is their poor photostability upon continuous excitation which is one of the crucial parameters of CPs. How to improve the photostability of CPs is always one of the key questions in this field. In this work, we found that the photostability of poly(3-hexylthiophene-2,5-diyl) (P3HT) molecules can be largely improved by addition of vitamin E (VE) in bulk solution, solid films and single molecules. In solution and films, VE can not only significantly retard the photodegradation of P3HT but also enhance the fluorescence intensity. For individual P3HT molecules, with increasing VE concentrations, the on-time duration increases and the off-time duration becomes shorter. VE as natural antioxidants can not only donate electrons to the long-lived charged species but also quench the triplet states of CPs via energy transfer accelerating the depopulation process back to the ground state. The short duration time of the charged species and the triplet states provides higher fluorescence intensity. Furthermore, VE can also directly react with singlet oxygen or other reactive oxygen species (ROS) preventing them from reacting with CPs. These results not only provide an efficient strategy for improving the photostability of conjugated polymers in solution and films, but also shed light on better understanding the photophysics of conjugated polymers at single-molecule level.
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Affiliation(s)
- Mingcai Xie
- Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Vehicle Emissions Control, Nanjing University Nanjing China
| | - Yan Hua
- Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Vehicle Emissions Control, Nanjing University Nanjing China
| | - Daocheng Hong
- Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Vehicle Emissions Control, Nanjing University Nanjing China
| | - Sushu Wan
- Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Vehicle Emissions Control, Nanjing University Nanjing China
| | - Yuxi Tian
- Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Vehicle Emissions Control, Nanjing University Nanjing China
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Podkowa A, Kryczyk-Poprawa A, Opoka W, Muszyńska B. Culinary–medicinal mushrooms: a review of organic compounds and bioelements with antioxidant activity. Eur Food Res Technol 2020. [DOI: 10.1007/s00217-020-03646-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
AbstractThere are about 3000 species of mushrooms, which have a high amount of substances that are beneficial to human health, such as antioxidants. It is well known that oxidative stress plays an important role in the etiopathogenesis of many diseases, including cancer, cardiovascular disorders, and diseases of the central nervous system. One way to prevent homeostasis disorders that occur as a result of excessive production of pro-oxidative substances is to include the ingredients having antioxidant properties in the diet. Several compounds, such as those with phenolic and indole derivatives as well as carotenoids and some vitamins, exhibit antioxidant activity. These substances are present in many foods, including mushrooms. In addition, they have certain unique compounds that are not found in other sources (e.g., norbadione A). The present work discusses selected ingredients exhibiting antioxidant activity, which are found in various species of mushrooms as wells as describes the content of these compounds in the extracts obtained from mushrooms using artificial digestive juice.
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Teychené J, Didacus-Prins D, Chouini-Lalanne N, Déjugnat C, Sartor V. Formulation induces direct DNA UV-A photooxidation. Part II. Pro-oxidant effect of formulated Vitamin E via generation of singlet oxygen. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7
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Makhneva ZK, Ashikhmin AA, Bolshakov MA, Moskalenko AA. Quenchers Protect BChl850 from Action of Singlet Oxygen in the Membranes of a Sulfur Photosynthetic Bacterium Allochromatium vinosum Strain MSU. Microbiology (Reading) 2019. [DOI: 10.1134/s0026261719010119] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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8
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Pirillo J, Mazzone G, Russo N. Theoretical Insights into the Switching Off/On of 1 O 2 Photosensitization in Chemicontrolled Photodynamic Therapy. Chemistry 2018; 24:3512-3519. [PMID: 29314348 DOI: 10.1002/chem.201704768] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Indexed: 01/17/2023]
Abstract
Density Functional Theory and time-dependent (TD) DFT calculations were carried out for recently reported 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY)-based photosensitizers (PSs) that could be activated by reactive oxygen species (ROS) to generate 1 O2 specifically in target tissues. To assess the applicability of the compounds as activatable PSs (a-PSs) in photodynamic therapy, absorption wavelengths; singlet-triplet energy gaps; and spin-orbit matrix elements for the radiationless transition, Sn →Tm , were investigated. A TD-DFT qualitative analysis indicated that only a Br-substituted BODIPY derivative with the chromanol ring of α-tocopherol linked by methylene functioned as an a-PS. The chromanol ring promotes photoinduced electron transfer to the BODIPY unit that reduces the probability of intersystem crossing and triplet-state population, and can turn off 1 O2 photosensitization. Therefore, 1 O2 photosensitization can be switched on only in target cells in which the chromanol ring is oxidized by ROS. The oxidation reaction pathways of the most promising derivative, by either 1 O2 or cumyloxyl radical as typical ROS, have been examined to reveal that oxidation by the cumyloxyl radical is more effective than that by 1 O2 .
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Affiliation(s)
- Jenny Pirillo
- Institute of Transformative Bio-Molecules, Nagoya University, Chikusa-ku, 464-8602, Nagoya, Japan
| | - Gloria Mazzone
- Department of Chemistry and Chemical Technologies, University of Calabria, Via P. Bucci, 87036, Arcavacata di Rende, Italy
| | - Nino Russo
- Department of Chemistry and Chemical Technologies, University of Calabria, Via P. Bucci, 87036, Arcavacata di Rende, Italy
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Aliakbari F, Sedighi Gilani MA, Yazdekhasti H, Koruji M, Asgari HR, Baazm M, Izadyar F, Kharrazi Nejad E, Khanezad M, Abbasi M. Effects of antioxidants, catalase and α-tocopherol on cell viability and oxidative stress variables in frozen-thawed mice spermatogonial stem cells. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2016; 45:63-68. [PMID: 27123904 DOI: 10.3109/21691401.2016.1138491] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Cryopreservation of spermatogonial stem cells is considered as a useful procedure for preserving fertility in children with testis cancer. SSCs were isolated from testes mice, and then antioxidant was added to the freezing medium. The Bax expression level in antioxidant groups was significantly (P ≤ 0.05) lower than the control group and a significant rise of Bcl2 expression was detected in the antioxidant groups. ROS production with antioxidant was significantly lower compared with the control group. Cryopreservation with the addition of the antioxidants can help increase the number of SSCs and improve the quality and viability of these cells after cryopreservation.
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Affiliation(s)
- Freshte Aliakbari
- a Department of Anatomy, School of Medicine , Tehran University of Medical Sciences , Tehran , Iran
| | - Mohamad Ali Sedighi Gilani
- b Department of Urology, Shariati Hospital , Tehran University of Medical Sciences , Tehran , Iran.,c Department of Andrology, Reproductive Biomedicine Research Center , Royan Institute for Stem Cell Biology and Technology, ACECR , Tehran , Iran
| | - Hossein Yazdekhasti
- a Department of Anatomy, School of Medicine , Tehran University of Medical Sciences , Tehran , Iran
| | - Morteza Koruji
- f Cellular and Molecular Research Center & Department of Anatomical Sciences , Iran University of Medical Sciences , Tehran , Iran
| | - Hamid Reza Asgari
- g Department of Anatomical Sciences, Faculty of Medicine , Iran University of Medical Sciences , Tehran , Iran
| | - Maryam Baazm
- d Department of Anatomy, School of Medicine , Arak University of Medical Sciences , Arak , Iran
| | | | - Ebrahim Kharrazi Nejad
- a Department of Anatomy, School of Medicine , Tehran University of Medical Sciences , Tehran , Iran
| | - Maryam Khanezad
- a Department of Anatomy, School of Medicine , Tehran University of Medical Sciences , Tehran , Iran
| | - Mehdi Abbasi
- a Department of Anatomy, School of Medicine , Tehran University of Medical Sciences , Tehran , Iran
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10
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de Vasconcelos Franco JS, Faheem M, Chaveiro A, Moreira da Silva F. Effects of α-tocopherol and freezing rates on the quality and heterologous in vitro fertilization capacity of stallion sperm after cryopreservation. Theriogenology 2016; 86:957-962. [PMID: 27125690 DOI: 10.1016/j.theriogenology.2016.03.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 03/12/2016] [Accepted: 03/12/2016] [Indexed: 10/22/2022]
Abstract
The effects of supplementation of α-tocopherol and different freezing rates (FRs) on the ability of stallion sperm to fertilize bovine oocytes with intact zona pellucida were investigated, in an attempt to develop a model to assess cryopreserved sperm function. Semen was obtained from four purebred Lusitano stallions (n = 4). Each ejaculate was subjected to cryopreservation with a commercial extender (Ghent, Minitub Iberia, Spain), without any supplementation (control) or supplemented with 2-mM α-tocopherol. The semen was exposed to two different FRs between 5 °C and -15 °C: slow (5 °C/min) and moderate (10 °C/min). After thawing, the viability (SYBR®-14 and propidium iodide [PI]), mitochondrial membrane potential (JC-1, 5,5',6,6'-tetrachloro-1,1',3,3'tetraethylbenzimidazolyl carbocyanine iodine) and membrane lipid peroxidation (C11-BODIPY(581/591)) of each sample were determined by flow cytometry. Moreover, the heterologous IVF rate was measured to evaluate the fertilization capacity of postthaw semen in the four different treatments. For both extenders, the viability was higher for spermatozoa cooled slowly (39.40 ± 2.17 vs. 17.59 ± 2.25-control; 31.96 ± 2.19 vs. 11.46 ± 1.34-Tocopherol; P < 0.05). The α-tocopherol extender improved (P < 0.05) postthaw lipid peroxidation (10.28 ± 0.70 vs. 15.40 ± 0.95-slow FR; 10.14 ± 0.40 vs. 13.48 ± 0.34-moderate FR); however, it did not improve viability and mitochondrial membrane potential. Regarding the IVF rate, in the moderate FR, α-tocopherol supplementation reported a higher percentage of IVF (20.50 ± 2.11; P < 0.05), comparing with the control (14.00 ± 1.84). Regarding the slow FR, no significance differences were observed for percentage of IVF between the two extenders and the FRs. However, it seems that the α-tocopherol supplementation improved the IVF rate. In conclusion, this research reported that bovine oocytes intact zona pellucida can be used to evaluate the quality of postthaw stallion semen and α-tocopherol supplementation in the stallion freezing extender might exert a protective effect against oxidative damage during heterologous IVF.
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Affiliation(s)
- J S de Vasconcelos Franco
- Animal Reproduction, Department of Agrarian Sciences, University of the Azores, CITA-A, Angra do Heroísmo, Portugal.
| | - M Faheem
- Animal Reproduction, Department of Agrarian Sciences, University of the Azores, CITA-A, Angra do Heroísmo, Portugal; Animal Production Department, Faculty of Agriculture, Cairo University, Giza, Egypt
| | - A Chaveiro
- Animal Reproduction, Department of Agrarian Sciences, University of the Azores, CITA-A, Angra do Heroísmo, Portugal
| | - F Moreira da Silva
- Animal Reproduction, Department of Agrarian Sciences, University of the Azores, CITA-A, Angra do Heroísmo, Portugal
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Kranz S, Huebsch M, Guellmar A, Voelpel A, Tonndorf-Martini S, Sigusch BW. Antibacterial photodynamic treatment of periodontopathogenic bacteria with indocyanine green and near-infrared laser light enhanced by TroloxTM. Lasers Surg Med 2015; 47:350-60. [DOI: 10.1002/lsm.22336] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/13/2014] [Indexed: 12/21/2022]
Affiliation(s)
- Stefan Kranz
- Polyclinic for Conservative Dentistry and Periodontology; University Hospital Jena, An der alten Post 4; Jena 07743 Germany
| | - Marie Huebsch
- Polyclinic for Prosthetic Dentistry and Material Science; University Hospital Jena, An der alten Post 4; Jena 07743 Germany
| | - Andre Guellmar
- Polyclinic for Conservative Dentistry and Periodontology; University Hospital Jena, An der alten Post 4; Jena 07743 Germany
| | - Andrea Voelpel
- Polyclinic for Conservative Dentistry and Periodontology; University Hospital Jena, An der alten Post 4; Jena 07743 Germany
| | - Silke Tonndorf-Martini
- Polyclinic for Conservative Dentistry and Periodontology; University Hospital Jena, An der alten Post 4; Jena 07743 Germany
| | - Bernd W. Sigusch
- Polyclinic for Conservative Dentistry and Periodontology; University Hospital Jena, An der alten Post 4; Jena 07743 Germany
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Parker AW, Bisby RH, Greetham GM, Kukura P, Scherer KM, Towrie M. Ultrafast vibrational spectroscopic studies on the photoionization of the α-tocopherol analogue trolox C. J Phys Chem B 2014; 118:12087-97. [PMID: 25260188 DOI: 10.1021/jp505113k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The initial events after photoexcitation and photoionization of α-tocopherol (vitamin E) and the analogue Trolox C have been studied by femtosecond stimulated Raman spectroscopy, transient absorption spectroscopy and time-resolved infrared spectroscopy. Using these techniques it was possible to follow the formation and decay of the excited state, neutral and radical cation radicals and the hydrated electron that are produced under the various conditions examined. α-Tocopherol and Trolox C in methanol solution appear to undergo efficient homolytic dissociation of the phenolic -OH bond to directly produce the tocopheroxyl radical. In contrast, Trolox C photochemistry in neutral aqueous solutions involves intermediate formation of a radical cation and the hydrated electron which undergo geminate recombination within 100 ps in competition with deprotonation of the radical cation. The results are discussed in relation to recently proposed mechanisms for the reaction of α-tocopherol with peroxyl radicals, which represents the best understood biological activity of this vitamin.
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Affiliation(s)
- Anthony W Parker
- Central Laser Facility, Research Complex at Harwell, STFC Rutherford Appleton Laboratory, Harwell Oxford , Didcot, Oxfordshire, OX11 0QX, U.K
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Vasconcelos Franco JS, Chaveiro A, da Silva FM. Effect of Freezing Rates and Supplementation of α-Tocopherol in the Freezing Extender in Equine Sperm Cryosurvival. J Equine Vet Sci 2014. [DOI: 10.1016/j.jevs.2014.05.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Knak A, Regensburger J, Maisch T, Bäumler W. Exposure of vitamins to UVB and UVA radiation generates singlet oxygen. Photochem Photobiol Sci 2014; 13:820-9. [DOI: 10.1039/c3pp50413a] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Effects of α-tocopherol and Ascorbic Acid on Equine Semen Quality after Cryopreservation. J Equine Vet Sci 2013. [DOI: 10.1016/j.jevs.2012.12.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Zhang W, Yi K, Chen C, Hou X, Zhou X. Application of antioxidants and centrifugation for cryopreservation of boar spermatozoa. Anim Reprod Sci 2012; 132:123-8. [DOI: 10.1016/j.anireprosci.2012.05.009] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2011] [Revised: 05/15/2012] [Accepted: 05/17/2012] [Indexed: 01/29/2023]
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Regensburger J, Knak A, Maisch T, Landthaler M, Bäumler W. Fatty acids and vitamins generate singlet oxygen under UVB irradiation. Exp Dermatol 2012; 21:135-9. [DOI: 10.1111/j.1600-0625.2011.01414.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Bäumler W, Regensburger J, Knak A, Felgenträger A, Maisch T. UVA and endogenous photosensitizers – the detection of singlet oxygen by its luminescence. Photochem Photobiol Sci 2012; 11:107-17. [DOI: 10.1039/c1pp05142c] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Zhang Y, Yousef YA, Li H, Melø TB, Naqvi KR. Comparison of the photochemical behaviors of α-tocopherol and its acetate in organic and aqueous micellar solutions. J Phys Chem A 2011; 115:8242-7. [PMID: 21675787 DOI: 10.1021/jp202805k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Photoionization is known to take place when α-tocopherol (TOH) is excited to the S(1) state in a polar medium. It has been previously suggested that TO(•) is formed only as a result of proton release by TOH(•+), a process that is expected to occur, in a protic solvent, on the subnanosecond time scale. Recent redeterminations of the molar absorption coefficients of e(aq)(–) (Hare J. Phys. Chem. A 2010, 114, 1766) and of TOH(•+) and TO(•) (Naqvi J. Phys. Chem. A 2010, 114, 10795) have paved the way for testing the above suggestion, even if subnanosecond time resolution is not available, since it implies the equality of [e(aq)(–)](0) and [TO(•)](0), where [···](0) denotes the concentration of the enclosed species immediately after a nanosecond laser pulse. Nanosecond pump-probe spectroscopy of TOH in aqueous micellar solution (AMS) and two organic solvents with similar polarities (acetonitrile and methanol) has revealed that prompt formation of TO(•) through dissociation (TOH + hν → TO(•) + H(•)) is not negligible even in AMS. In acetonitrile, TOH(•+) and TO(•) are formed with comparable yields, and the former converts quantitatively into TO(•) within 15 μs. In methanol, TO(•) was observed, but no evidence was found for electron ejection from TOH. Only one photoproduct, namely TO(•), could be detected when α-tocopherol acetate (TOAc) was excited to the S(1) state in several polar and nonpolar solvents; TOAc has been found to be a more efficient energy degrader than TOH.
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Affiliation(s)
- Ye Zhang
- Department of Physics, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
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Gaspar LR, Campos PMBGM. A HPLC method to evaluate the influence of photostabilizers on cosmetic formulations containing UV-filters and vitamins A and E. Talanta 2010; 82:1490-4. [DOI: 10.1016/j.talanta.2010.07.025] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2010] [Revised: 07/12/2010] [Accepted: 07/12/2010] [Indexed: 12/14/2022]
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CRISOSTOMO ANAG, MORENO RAPHAELB, NAVARATNAM SUPPIAH, WILKINSON JAMESA, BISBY ROGERH. Generation of superoxide and singlet oxygen from alpha-tocopherolquinone and analogues. Free Radic Res 2007; 41:730-7. [PMID: 17516246 PMCID: PMC2080821 DOI: 10.1080/10715760701324075] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Three potential routes to generation of reactive oxygen species (ROS) from alpha-tocopherolquinone (alpha-TQ) have been identified. The quinone of the water-soluble vitamin E analogue Trolox C (Trol-Q) is reduced by hydrated electron and isopropanol alpha-hydroxyalkyl radical, and the resulting semiquinone reacts with molecular oxygen to form superoxide with a second order rate constant of 1.3 x 10(8) dm(3)/mol/s, illustrating the potential for redox cycling. Illumination (UV-A, 355 nm) of the quinone of 2,2,5,7,8-pentamethyl-6-hydroxychromanol (PMHC-Q) leads to a reactive short-lived (ca. 10(- 6) s) triplet state, able to oxidise tryptophan with a second order rate constant greater than 10(9) dm(3)/mol/s. The triplet states of these quinones sensitize singlet oxygen formation with quantum yields of about 0.8. Such potentially damaging reactions of alpha-TQ may in part account for the recent findings that high levels of dietary vitamin E supplementation lack any beneficial effect and may lead to slightly enhanced levels of overall mortality.
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Affiliation(s)
- ANA G CRISOSTOMO
- Biomedical Sciences Research Institute, University of Salford, Salford M5 4WT, UK
| | - RAPHAEL B MORENO
- Biomedical Sciences Research Institute, University of Salford, Salford M5 4WT, UK
| | - SUPPIAH NAVARATNAM
- Biomedical Sciences Research Institute, University of Salford, Salford M5 4WT, UK
- FRRF, CCLRC Daresbury Laboratory, Warrington WA4 4AD, UK
| | - JAMES A WILKINSON
- Biomedical Sciences Research Institute, University of Salford, Salford M5 4WT, UK
| | - ROGER H BISBY
- Biomedical Sciences Research Institute, University of Salford, Salford M5 4WT, UK
- Correspondence: Roger Bisby, Biomedical Sciences Research Institute, Peel Building, University of Salford, Salford M5 4WT, UK. Fax 0161 295 5015. Email
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Michael A, Alexopoulos C, Pontiki E, Hadjipavlou-Litina D, Saratsis P, Boscos C. Effect of antioxidant supplementation on semen quality and reactive oxygen species of frozen-thawed canine spermatozoa. Theriogenology 2007; 68:204-12. [PMID: 17540441 DOI: 10.1016/j.theriogenology.2007.04.053] [Citation(s) in RCA: 121] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2006] [Revised: 04/19/2007] [Accepted: 04/25/2007] [Indexed: 11/20/2022]
Abstract
The objective of this study was to evaluate post-thaw quality of frozen dog semen processed with diluents containing different antioxidants. Ejaculates were collected, pooled and evaluated for concentration, motility, rapid steady forward movement (RSF movement), viability, acrosomal integrity and by the hypo-osmotic swelling test. Also, superoxide production, hydroxyl radicals and total reactive oxygen species (tROS) were determined. The pool was divided in seven aliquots, for control and test conditions, which were processed for cryopreservation. The sperm pellets were diluted to a final concentration of 200x10(6)sperm/ml with TRIS-glucose-egg yolk extender containing one of the following supplements: vitamin C (1.5mM), NAC (N-acetyl-l-cysteine; 1.5mM), taurine (0.6mM), catalase (300U/ml), vitamin E (0.3mM) and B16 [5-(4-dimethylamino-phenyl)-2-phenyl-penta-2,4-dienoic acid; 0.3mM]. Post-thaw semen evaluation showed that mean (+/-S.E.M.) motility was increased (p<0.001) after addition of catalase (49.75+/-3.63 versus 39.00+/-2.90 in controls), whereas more spermatozoa with RSF movement were observed (p<0.001) after the catalase, NAC and vitamin E treatments (31.75+/-3.46, 28.00+/-3.27, 26.75+/-3.15, respectively, versus 17.00+/-2.26 in controls). Viability was increased (p<0.001) after addition of catalase, taurine, NAC and tocopherol (66.00+/-3.03, 61.90+/-2.48, 60.60+/-1.93 and 60.50+/-4.12, respectively, versus 51.70+/-2.81 in controls). The percentage of swollen spermatozoa was increased after addition of catalase and taurine (61.75+/-1.61 and 61.25+/-1.49, respectively, versus 55.65+/-1.64 in controls). Acrosomal integrity was not influenced in any case. B16 addition had adverse effects on all parameters evaluated. None of the reactive oxygen species were significantly reduced post-thaw in antioxidant treated semen. The results suggest that catalase had the most pronounced effect in improving post-thaw quality of canine spermatozoa.
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Affiliation(s)
- A Michael
- Faculty of Veterinary Medicine, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece
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