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Wu Y, Lei D, Li J, Luo Y, Du Y, Zhang S, Zu B, Su Y, Dou X. Controlled Synthesis of Preferential Facet-Exposed Fe-MOFs for Ultrasensitive Detection of Peroxides. Small 2024:e2401024. [PMID: 38597755 DOI: 10.1002/smll.202401024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 03/15/2024] [Indexed: 04/11/2024]
Abstract
Exposing different facets on metal-organic frameworks (MOFs) is highly desirable to enhance the performance for various applications, however, exploiting a concise and effective approach to achieve facet-controlled synthesis of MOFs remains challenging. Here, by modulating the ratio of metal precursors to ligands, the facet-engineered iron-based MOFs (Fe-MOFs) exhibits enhanced catalytic activity for Fenton reaction are explored, and the mechanism of facet-dependent performance is revealed in detail. Fully exposed (101) and (100) facets on spindle-shaped Fe-MOFs enable rapid oxidation of colorless o-phenylenediamine (OPD) to colored products, thereby establishing a dual-mode platform for the detection of hydrogen peroxide (H2O2) and triacetone triperoxide (TATP). Thus, a detection limit as low as 2.06 nm is achieved, and robust selectivity against a wide range of common substances (>16 types) is obtained, which is further improved by incorporating a deep learning architecture with an SE-VGG16 network model, enabling precise differentiation of oxidizing agents from captured images. The present strategy is expected will shine light on both the rational synthesis of nanomaterials with modulated morphologies and the exploitation of high-performance trace chemical sensors.
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Affiliation(s)
- Yuquan Wu
- College of Chemical Engineering, Xinjiang University, Urumqi, 830017, China
- Xinjiang Key Laboratory of Trace Chemical Substances Sensing, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, 830011, China
- Key Laboratory of Improvised Explosive Chemicals for State Market Regulation, Urumqi, 830011, China
| | - Da Lei
- Xinjiang Key Laboratory of Trace Chemical Substances Sensing, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, 830011, China
| | - Jiawen Li
- Xinjiang Key Laboratory of Trace Chemical Substances Sensing, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, 830011, China
| | - Ying Luo
- Xinjiang Key Laboratory of Trace Chemical Substances Sensing, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, 830011, China
| | - Yuwan Du
- Xinjiang Key Laboratory of Trace Chemical Substances Sensing, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, 830011, China
| | - Shi Zhang
- Xinjiang Key Laboratory of Trace Chemical Substances Sensing, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, 830011, China
| | - Baiyi Zu
- Xinjiang Key Laboratory of Trace Chemical Substances Sensing, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, 830011, China
- Key Laboratory of Improvised Explosive Chemicals for State Market Regulation, Urumqi, 830011, China
| | - Yuhong Su
- College of Chemical Engineering, Xinjiang University, Urumqi, 830017, China
| | - Xincun Dou
- Xinjiang Key Laboratory of Trace Chemical Substances Sensing, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, 830011, China
- Key Laboratory of Improvised Explosive Chemicals for State Market Regulation, Urumqi, 830011, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
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Arteaga A, Arino T, Moore GC, Bustos JL, Horton MK, Persson KA, Li J, Stickle WF, Kohlgruber TA, Surbella RG, Nyman M. The Role of Alkalis in Orchestrating Uranyl- Peroxide Reactivity Leading to Direct Air Capture of Carbon Dioxide. Chemistry 2024:e202301687. [PMID: 38466912 DOI: 10.1002/chem.202301687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2024] [Revised: 03/10/2024] [Accepted: 03/11/2024] [Indexed: 03/13/2024]
Abstract
Spectator ions have known and emerging roles in aqueous metal-cation chemistry, respectively directing solubility, speciation, and reactivity. Here, we isolate and structurally characterize the last two metastable members of the alkali uranyl triperoxide series, the Rb+ and Cs+ salts (Cs-U1 and Rb-U1). We document their rapid solution polymerization via small-angle X-ray scattering, which is compared to the more stable Li+, Na+ and K+ analogues. To understand the role of the alkalis, we also quantify alkali-hydroxide promoted peroxide deprotonation and decomposition, which generally exhibits increasing reactivity with increasing alkali size. Cs-U1, the most unstable of the uranyl triperoxide monomers, undergoes ambient direct air capture of CO2 in the solid-state, converting to Cs4[UVIO2(CO3)3], evidenced by single-crystal X-ray diffraction, transmission electron microscopy, and Raman spectroscopy. We have attempted to benchmark the evolution of Cs-U1 to uranyl tricarbonate, which involves a transient, unstable hygroscopic solid that contains predominantly pentavalent uranium, quantified by X-ray photoelectron spectroscopy. Powder X-ray diffraction suggests this intermediate state contains a hydrous derivative of CsUVO3, where the parent phase has been computationally predicted, but not yet synthesized.
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Affiliation(s)
- Ana Arteaga
- Department of Chemistry, Oregon State University, Corvallis, OR, 97331, USA
- Pacific Northwest National Laboratory, 902 Battelle Blvd, Richland, WA 99354, USA
| | - Trevor Arino
- Department of Chemistry, Oregon State University, Corvallis, OR, 97331, USA
- current address, Department of Nuclear Chemistry U.C. Berkeley, Berkeley, California, 94720, USA
| | - Guy C Moore
- Department of Materials Science and Engineering, U. C. Berkeley, California, 94720, USA
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Jenna L Bustos
- Department of Chemistry, Oregon State University, Corvallis, OR, 97331, USA
| | - Matthew K Horton
- Department of Materials Science and Engineering, U. C. Berkeley, California, 94720, USA
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Kristin A Persson
- Department of Materials Science and Engineering, U. C. Berkeley, California, 94720, USA
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Jun Li
- Department of Chemistry, Oregon State University, Corvallis, OR, 97331, USA
| | | | | | - Robert G Surbella
- Pacific Northwest National Laboratory, 902 Battelle Blvd, Richland, WA 99354, USA
| | - May Nyman
- Department of Chemistry, Oregon State University, Corvallis, OR, 97331, USA
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Ghai A, Sabour E, Salonga R, Ho R, Apollonio DE. Exposures to Bleach, Peroxide, Disinfectants, Antimalarials, and Ivermectin Reported to the California Poison Control System Before and During the COVID-19 Pandemic, 2015-2021. Public Health Rep 2024; 139:112-119. [PMID: 37933467 PMCID: PMC10905766 DOI: 10.1177/00333549231201679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2023] Open
Abstract
OBJECTIVES The COVID-19 pandemic led to widespread fear of infection, with many people expanding their use of cleaning products and trying unproven prevention and treatment strategies. We described shifts in reported exposures related to COVID-19 home interventions. METHODS This study considered suspected toxicity exposures involving household cleaning products (bleach, peroxide, disinfectants), antimalarials (hydroxychloroquine and chloroquine), and ivermectin reported to the California Poison Control System from 2015 through 2021 and assessed trends in exposures by using interrupted time-series analyses. RESULTS We found a significant increase in exposures reported to the California Poison Control System related to household cleaning products and ivermectin during the COVID-19 pandemic. As of January 1, 2015, the baseline level of reported exposures to household cleaning products was 707.33 per month and was declining at a rate of 1.71 (95% CI, -2.87 to -0.56) per month through February 29, 2020. In March 2020, an increase of 466.57 (95% CI, 328.08-605.07) reported exposures above baseline occurred, after which exposures to cleaning products decreased at a rate of 23.40 (95% CI, -32.48 to -14.32) per month. The number of reported exposures to antimalarials did not change significantly before or during the pandemic. The number of reported ivermectin exposures before December 2020 was initially stable at 14.50 per month and then increased by 2.05 per month through December 2021. CONCLUSIONS Our observations suggest that while some dangerous home prevention and treatment efforts resolve over time, further interventions may be needed to reduce the public health effects related to attempts to self-treat COVID-19 with ivermectin.
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Affiliation(s)
- Alice Ghai
- School of Pharmacy, University of California San Francisco, San Francisco, CA, USA
| | - Emily Sabour
- School of Pharmacy, University of California San Francisco, San Francisco, CA, USA
| | - Raeann Salonga
- School of Pharmacy, University of California San Francisco, San Francisco, CA, USA
| | - Raymond Ho
- School of Pharmacy, University of California San Francisco, San Francisco, CA, USA
- California Poison Control System, San Francisco, CA, USA
| | - Dorie E Apollonio
- School of Pharmacy, University of California San Francisco, San Francisco, CA, USA
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4
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Fnu G, Weber GF. Osteopontin induces mitochondrial biogenesis in deadherent cancer cells. Oncotarget 2023; 14:957-969. [PMID: 38039408 PMCID: PMC10691814 DOI: 10.18632/oncotarget.28540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 11/16/2023] [Indexed: 12/03/2023] Open
Abstract
Metastasizing cells display a unique metabolism, which is very different from the Warburg effect that arises in primary tumors. Over short time frames, oxidative phosphorylation and ATP generation are prominent. Over longer time frames, mitochondrial biogenesis becomes a pronounced feature and aids metastatic success. It has not been known whether or how these two phenomena are connected. We hypothesized that Osteopontin splice variants, which synergize to increase ATP levels in deadherent cells, also increase the mitochondrial mass via the same signaling mechanisms. Here, we report that autocrine Osteopontin does indeed stimulate an increase in mitochondrial size, with the splice variant -c being more effective than the full-length form -a. Osteopontin-c achieves this via its receptor CD44v, jointly with the upregulation and co-ligation of the chloride-dependent cystine-glutamate transporter SLC7A11. The signaling proceeds through activation of the known mitochondrial biogenesis inducer PGC-1 (which acts as a transcription coactivator). Peroxide is an important intermediate in this cascade, but surprisingly acts upstream of PGC-1 and is likely produced as a consequence of SLC7A11 recruitment and activation. In vivo, suppression of the biogenesis-inducing mechanisms leads to a reduction in disseminated tumor mass. This study confirms a functional connection between the short-term oxidative metabolism and the longer-term mitochondrial biogenesis in cancer metastasis - both are induced by Osteopontin-c. The results imply possible mechanisms and targets for treating cancer metastasis.
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Affiliation(s)
- Gulimirerouzi Fnu
- University of Cincinnati Academic Health Center, James L. Winkle College of Pharmacy, Cincinnati, OH 45229, USA
| | - Georg F. Weber
- University of Cincinnati Academic Health Center, James L. Winkle College of Pharmacy, Cincinnati, OH 45229, USA
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Liu B, Mullen L, Payne EM, Linden KG. Accelerated Ultraviolet Treatment of Carbamazepine and NDMA in Water under 222 nm Irradiation. Environ Sci Technol 2023; 57:18909-18917. [PMID: 37186817 DOI: 10.1021/acs.est.3c00703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Krypton chloride (KrCl*) excimer ultraviolet (UV) light may provide advantages for contaminant degradation compared to conventional low-pressure (LP) UV. Direct and indirect photolysis as well as UV/hydrogen peroxide-driven advanced oxidation (AOP) of two chemical contaminants were investigated in laboratory grade water (LGW) and treated secondary effluent (SE) for LPUV and filtered KrCl* excimer lamps emitting at 254 and 222 nm, respectively. Carbamazepine (CBZ) and N-nitrosodimethylamine (NDMA) were chosen because of their unique molar absorption coefficient profiles, quantum yields (QYs) at 254 nm, and reaction rate constants with hydroxyl radical. Quantum yields and molar absorption coefficients at 222 nm for both CBZ and NDMA were determined, with measured molar absorption coefficients of 26 422 and 8170 M-1 cm-1, respectively, and QYs of 1.95 × 10-2 and 6.68 × 10-1 mol Einstein-1, respectively. The 222 nm irradiation of CBZ in SE improved degradation compared to that in LGW, likely through promotion of in situ radical formation. AOP conditions improved degradation of CBZ in LGW for both UV LP and KrCl* sources but did not improve NDMA decay. In SE, photolysis of CBZ resulted in decay similar to that of AOP, likely due to the in situ generation of radicals. Overall, the KrCl* 222 nm source significantly improves contaminant degradation compared to that of 254 nm LPUV.
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Affiliation(s)
- Bryan Liu
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, 4001 Discovery Drive, Boulder, Colorado 80303, United States
| | - Lauren Mullen
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, 4001 Discovery Drive, Boulder, Colorado 80303, United States
| | - Emma M Payne
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, 4001 Discovery Drive, Boulder, Colorado 80303, United States
| | - Karl G Linden
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, 4001 Discovery Drive, Boulder, Colorado 80303, United States
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Yang L, Lai Y, Cheung CI, Ye Z, Huang T, Wang Y, Chin Y, Chia Z, Chen Y, Li M, Tseng H, Tsai Y, Zhang Z, Chen K, Tsai B, Shieh D, Lee N, Tsai P, Huang C. Novel metal peroxide nanoboxes restrain Clostridioides difficile infection beyond the bactericidal and sporicidal activity. Bioeng Transl Med 2023; 8:e10593. [PMID: 38023694 PMCID: PMC10658501 DOI: 10.1002/btm2.10593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 07/26/2023] [Accepted: 07/30/2023] [Indexed: 12/01/2023] Open
Abstract
Clostridioides difficile spores are considered as the major source responsible for the development of C. difficile infection (CDI), which is associated with an increased risk of death in patients and has become an important issue in infection control of nosocomial infections. Current treatment against CDI still relies on antibiotics, which also damage normal flora and increase the risk of CDI recurrence. Therefore, alternative therapies that are more effective against C. difficile bacteria and spores are urgently needed. Here, we designed an oxidation process using H2O2 containing PBS solution to generate Cl- and peroxide molecules that further process Ag and Au ions to form nanoboxes with Ag-Au peroxide coat covering Au shell and AgCl core (AgAu-based nanoboxes). The AgAu-based nanoboxes efficiently disrupted the membrane structure of bacteria/spores of C. difficile after 30-45 min exposure to the highly reactive Ag/Au peroxide surface of the nano structures. The Au-enclosed AgCl provided sustained suppression of the growth of 2 × 107 pathogenic Escherichia coli for up to 19 days. In a fecal bench ex vivo test and in vivo CDI murine model, biocompatibility and therapeutic efficacy of the AuAg nanoboxes to attenuate CDI was demonstrated by restoring the gut microbiota and colon mucosal structure. The treatment successfully rescued the CDI mice from death and prevented their recurrence mediated by vancomycin treatment. The significant outcomes indicated that the new peroxide-derived AgAu-based nanoboxes possess great potential for future translation into clinical application as a new alternative therapeutic strategy against CDI.
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Affiliation(s)
- Li‐Xing Yang
- Department of PhotonicsNational Cheng Kung UniversityTainanTaiwan
- School of Dentistry and Institute of Oral MedicineNational Cheng Kung UniversityTainanTaiwan
| | - Yi‐Hsin Lai
- Institute of Basic MedicineNational Cheng Kung UniversityTainanTaiwan
| | - Chun In Cheung
- Department of PhotonicsNational Cheng Kung UniversityTainanTaiwan
| | - Zhi Ye
- Department of Medical Laboratory Science and BiotechnologyNational Cheng Kung UniversityTainanTaiwan
| | - Tzu‐Chi Huang
- Department of PhotonicsNational Cheng Kung UniversityTainanTaiwan
| | - Yu‐Chin Wang
- Department of Medical Laboratory Science and BiotechnologyNational Cheng Kung UniversityTainanTaiwan
| | - Yu‐Cheng Chin
- Department of PhotonicsNational Cheng Kung UniversityTainanTaiwan
| | - Zi‐Chun Chia
- Department of PhotonicsNational Cheng Kung UniversityTainanTaiwan
| | - Ya‐Jyun Chen
- Department of PhotonicsNational Cheng Kung UniversityTainanTaiwan
| | - Meng‐Jia Li
- Institute of Basic MedicineNational Cheng Kung UniversityTainanTaiwan
| | - Hsiu‐Ying Tseng
- Department of Medical Laboratory Science and BiotechnologyNational Cheng Kung UniversityTainanTaiwan
| | - Yi‐Tseng Tsai
- Department of PhotonicsNational Cheng Kung UniversityTainanTaiwan
| | - Zhi‐Bin Zhang
- Department of PhotonicsNational Cheng Kung UniversityTainanTaiwan
| | - Kuan‐Hsu Chen
- Department of PhotonicsNational Cheng Kung UniversityTainanTaiwan
| | - Bo‐Yang Tsai
- Institute of Basic MedicineNational Cheng Kung UniversityTainanTaiwan
| | - Dar‐Bin Shieh
- School of Dentistry and Institute of Oral MedicineNational Cheng Kung UniversityTainanTaiwan
- Institute of Basic MedicineNational Cheng Kung UniversityTainanTaiwan
- Center of Applied Nanomedicine and Core Facility CenterNational Cheng Kung UniversityTainanTaiwan
- iMANI Center of the National Core Facility for BiopharmaceuticalsNational Science and Technology CouncilTaipeiTaiwan
- Department of StomatologyNational Cheng Kung University HospitalTainanTaiwan
| | - Nan‐Yao Lee
- Department of MedicineNational Cheng Kung UniversityTainanTaiwan
- Division of Infectious Diseases, Department of Internal Medicine and Center for Infection ControlNational Cheng Kung University HospitalTainanTaiwan
| | - Pei‐Jane Tsai
- Institute of Basic MedicineNational Cheng Kung UniversityTainanTaiwan
- Department of Medical Laboratory Science and BiotechnologyNational Cheng Kung UniversityTainanTaiwan
- Research Center of Infectious Disease and SignalingNational Cheng Kung UniversityTainanTaiwan
- Department of Pathology, National Cheng Kung University Hospital, College of MedicineNational Cheng Kung UniversityTainanTaiwan
| | - Chih‐Chia Huang
- Department of PhotonicsNational Cheng Kung UniversityTainanTaiwan
- Center of Applied Nanomedicine and Core Facility CenterNational Cheng Kung UniversityTainanTaiwan
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Koirala S, Myers B, Shin GY, Gitaitis R, Kvitko BH, Dutta B. Evaluating Options to Increase the Efficacy of Biocontrol Agents for the Management of Pantoea spp. Under Field Conditions. Plant Dis 2023; 107:2701-2708. [PMID: 36774574 DOI: 10.1094/pdis-11-22-2710-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Center rot of onion is caused by a complex of plant pathogenic Pantoea species, which can lead to significant yield losses in the field and during storage. Conventional growers use foliar protectants such as a mixture of copper bactericides and an ethylene-bis-dithiocarbamate (EBDC) fungicide to manage the disease; however, organic growers have limited management options besides copper-protectants. Biocontrol agents (BCAs) provide an alternative; however, their efficacy could be compromised due in part to their inability to colonize the foliage. We hypothesized that pretreatment with peroxide (OxiDate 2.0: a.i., hydrogen peroxide and peroxyacetic acid) enhances the colonizing ability of the subsequently applied BCAs, leading to effective center rot management. Field trials were conducted in 2020 and 2021 to assess the efficacy of peroxide, BCAs (Serenade ASO: Bacillus subtilis and BlightBan: Pseudomonas fluorescens), and an insecticide program (tank mix of spinosad and neem oil) to manage center rot. We observed no significant difference in foliar area under the disease progress curve (AUDPC) between the peroxide pretreated P. fluorescens plots and only P. fluorescens-treated plots in 2020 and 2021. Peroxide pretreatment before B. subtilis application significantly reduced the foliar AUDPC as compared with the stand-alone B. subtilis treatment in 2020; however, no such difference was observed in 2021. Similarly, peroxide pretreatment before either of the BCAs did not seem to reduce the incidence of bulb rot as compared with the stand-alone BCA treatment in any of the trials (2020 and 2021). Additionally, our foliar microbiome study showed comparatively higher P. fluorescens retention on peroxide pretreated onion foliage; however, at the end of the growing season, P. fluorescens was drastically reduced and was virtually nonexistent (<0.002% of the total reads). Overall, the pretreatment with peroxide had a limited effect in improving the foliar colonizing ability of BCAs and consequently a limited effect in managing center rot.
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Affiliation(s)
- Santosh Koirala
- Department of Plant Pathology, University of Georgia, Tifton, GA
| | - Brendon Myers
- Department of Plant Pathology, University of Georgia, Tifton, GA
| | - Gi Yoon Shin
- Department of Plant Pathology, University of Georgia, Athens, GA
| | - Ron Gitaitis
- Department of Plant Pathology, University of Georgia, Tifton, GA
| | - Brian H Kvitko
- Department of Plant Pathology, University of Georgia, Athens, GA
| | - Bhabesh Dutta
- Department of Plant Pathology, University of Georgia, Tifton, GA
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Fabin M, Skóra P, Polis M, Zakusylo R, Stolarczyk A, Jarosz T. Towards "Green" ANFO: Study of Perchlorates and Inorganic Peroxides as Potential Additives. Molecules 2023; 28:5636. [PMID: 37570606 PMCID: PMC10420230 DOI: 10.3390/molecules28155636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 07/19/2023] [Accepted: 07/23/2023] [Indexed: 08/13/2023] Open
Abstract
Ammonium nitrate-fuel oil (ANFO) explosives are inexpensive and readily produced, but are highly prone to misfires, with the remaining explosive being a significant risk and environmental contaminant. In this work, studies on various additives, such as selected perchlorates and inorganic peroxides, which are intended to lower the susceptibility of ANFO to misfires by increasing its sensitivity to shock, have been conducted. These studies showed the viability of using these additives in ANFO, allowing for conducting shock wave sensitivity tests for bulk charges in the future. We investigated the effects of introducing these additives into ANFO (on its sensitivity), as well as thermal and energetic properties. We observed minor increases in friction and impact sensitivity, as well as a moderate reduction in the decomposition temperature of the additive-supplemented ANFO in comparison to unmodified ANFO.
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Affiliation(s)
- Magdalena Fabin
- Department of Physical Chemistry and Technology of Polymers, Silesian University of Technology, 44-100 Gliwice, Poland (A.S.)
| | - Paweł Skóra
- Department of Inorganic Chemistry, Analytical Chemistry and Electrochemistry, Silesian University of Technology, 44-100 Gliwice, Poland
| | - Mateusz Polis
- Explosive Techniques Research Group, Łukasiewicz Research Network-Institute of Industrial Organic Chemistry, 42-693 Krupski Młyn, Poland
| | - Roman Zakusylo
- Shostka Institute, Sumy State University, 41100 Shostka, Ukraine;
| | - Agnieszka Stolarczyk
- Department of Physical Chemistry and Technology of Polymers, Silesian University of Technology, 44-100 Gliwice, Poland (A.S.)
| | - Tomasz Jarosz
- Department of Physical Chemistry and Technology of Polymers, Silesian University of Technology, 44-100 Gliwice, Poland (A.S.)
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Radulov PS, Yaremenko IA, Keiser J, Terent'ev AO. Bridged 1,2,4-Trioxolanes: SnCl 4-Catalyzed Synthesis and an In Vitro Study against S. mansoni. Molecules 2023; 28:4913. [PMID: 37446575 DOI: 10.3390/molecules28134913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 04/03/2023] [Accepted: 06/20/2023] [Indexed: 07/15/2023] Open
Abstract
A synthesis of bridged 1,2,4-trioxolanes (bridged ozonides) from 1,5-diketones and hydrogen peroxide catalyzed by SnCl4 was developed. It was shown that the ratio of target ozonides can be affected by the application of SnCl4 as a catalyst and varying the solvent. A wide range of bridged 1,2,4-trioxolanes (ozonides) was obtained in yields from 50 to 84%. The ozonide cycle was moderately resistant to the reduction of the ester group near the peroxide cycle to alcohol with LiAlH4. The bridged ozonides were evaluated for their antischistosomal activity. These ozonides exhibited a very high activity against newly transformed schistosomula and adult Schistosoma mansoni.
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Affiliation(s)
- Peter S Radulov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 119991, Russia
| | - Ivan A Yaremenko
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 119991, Russia
| | - Jennifer Keiser
- Department of Medical Parasitology and Infection Biology, Swiss Tropical and Public Health Institute, CH-4123 Allschwil, Switzerland
- University of Basel, CH-4003 Basel, Switzerland
| | - Alexander O Terent'ev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 119991, Russia
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Ting M, Dahlkemper A, Schwartz JJ, Woodfork M, Suzuki JB. Preprocedural Viral Load Effects of Oral Antiseptics on SARS-CoV-2 in Patients with COVID-19: A Systematic Review. Biomedicines 2023; 11:1694. [PMID: 37371789 DOI: 10.3390/biomedicines11061694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/09/2023] [Accepted: 06/09/2023] [Indexed: 06/29/2023] Open
Abstract
(1) There are limited clinical trials to support the effectiveness of mouth rinses when used as a preprocedural rinse against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). This systematic review aims to evaluate the efficacy of antiseptic mouth rinses as a preprocedural rinse in reducing SARS-CoV-2 oral viral load in-vivo. (2) Methods: A literature search was conducted through November 2022 for the following databases: PubMed, Web of Science, Cochrane Library, and Google Scholar. The evaluated outcomes were quantitative changes in viral load and the statistical significance of that change after using antiseptic mouth rinses. (3) Results: 14 randomized controlled trials (RCT) were selected for risk of bias assessment and data extraction. (4) Conclusion: Within the limits of this systematic review, preprocedural mouth rinses may significantly reduce SARS-CoV-2 in the mouth, thus, reducing the viral particles available for airborne dispersion. Preprocedural mouth rinses may be an effective strategy for reducing airborne SARS-CoV-2 dispersion in the environment. Their use may be a preventive strategy to reduce the spread of COVID-19 in selected medical and healthcare facilities, including dental clinics. Potential preprocedural mouth rinses are identified for use as an integral part of safe practice for healthcare protocols. This systematic review was registered with the National Institute for Health Research, international prospective register of systematic reviews (PROSPERO): CRD42022315177.
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Affiliation(s)
- Miriam Ting
- Department of Periodontics, University of Pennsylvania, Philadelphia, PA 19104, USA
- General Practice Residency, Albert Einstein Medical Center, Philadelphia, PA 19141, USA
- Think Dental Learning Institute, Paoli, PA 19301, USA
| | - Alex Dahlkemper
- General Practice Residency, Albert Einstein Medical Center, Philadelphia, PA 19141, USA
| | - Jeremy J Schwartz
- General Practice Residency, Albert Einstein Medical Center, Philadelphia, PA 19141, USA
| | - Manzel Woodfork
- General Practice Residency, Albert Einstein Medical Center, Philadelphia, PA 19141, USA
| | - Jon B Suzuki
- Department of Graduate Periodontics, University of Maryland, Baltimore, MD 21201, USA
- Department of Graduate Prosthodontics, University of Washington, Seattle, WA 98015, USA
- Department of Graduate Periodontics, Nova Southeastern University, Ft. Lauderdale, FL 33314, USA
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11
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Amer M. Intracoronal tooth bleaching - A review and treatment guidelines. Aust Dent J 2023; 68 Suppl 1:S141-S152. [PMID: 37975331 DOI: 10.1111/adj.13000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/19/2023] [Indexed: 11/19/2023]
Abstract
Intracoronal bleaching is a minimally invasive procedure that was introduced into dentistry in the 19th century. The role of that procedure in enhancing the colour of teeth subjected to internal discolouration while being conservative made it extremely popular amongst dental professionals. Different materials and techniques have been utilized over the years attempting to obtain predictable long-term results while minimizing any associated risks. Contemporarily, bleaching agents are mainly based on peroxide-releasing compounds in different formulations and delivery systems. Different theories have been formulated on the bleaching mechanism of such agents, but the exact mechanism is yet to be proven. The effect of hydrogen peroxide-based bleaching agents on the organic structure of enamel and dentine has been extensively investigated to address the effects of bonding of resin-based restorative materials to hard tooth structure. Multiple case reports raised a concern about the contribution of intracoronal bleaching in developing invasive root resorption. Modification of intracoronal bleaching techniques was thus necessary to address such concerns. This review will provide a summary of the important aspects of intracoronal bleaching, focusing on how it applies to the contemporary clinical setting. © 2023 Australian Dental Association.
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Affiliation(s)
- M Amer
- Melbourne Dental School, Faculty of Medicine, Dentistry and Health Sciences, Melbourne, Victoria, Australia
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12
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Müller-Heupt LK, Eckelt A, Eckelt J, Groß J, Opatz T, Kommerein N. An In Vitro Study of Local Oxygen Therapy as Adjunctive Antimicrobial Therapeutic Option for Patients with Periodontitis. Antibiotics (Basel) 2023; 12:990. [PMID: 37370309 DOI: 10.3390/antibiotics12060990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 05/25/2023] [Accepted: 05/29/2023] [Indexed: 06/29/2023] Open
Abstract
Periodontitis is a common global disease caused by bacterial dysbiosis leading to tissue destruction, and it is strongly associated with anaerobic bacterial colonization. Therapeutic strategies such as oxygen therapy have been developed to positively influence the dysbiotic microbiota, and the use of oxygen-releasing substances may offer an added benefit of avoiding systemic effects commonly associated with antibiotics taken orally or hyperbaric oxygen therapy. Therefore, the oxygen release of calcium peroxide (CaO2) was measured using a dissolved oxygen meter, and CaO2 solutions were prepared by dissolving autoclaved CaO2 in sterile filtered and deionized water. The effects of CaO2 on planktonic bacterial growth and metabolic activity, as well as on biofilms of Streptococcus oralis and Porphyromonas gingivalis, were investigated through experiments conducted under anaerobic conditions. The objective of this study was to investigate the potential of CaO2 as an antimicrobial agent for the treatment of periodontitis. Results showed that CaO2 selectively inhibited the growth and viability of P. gingivalis (p < 0.001) but had little effect on S. oralis (p < 0.01), indicating that CaO2 has the potential to selectively affect both planktonic bacteria and mono-species biofilms of P. gingivalis. The results of this study suggest that CaO2 could be a promising antimicrobial agent with selective activity for the treatment of periodontitis.
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Affiliation(s)
- Lena Katharina Müller-Heupt
- Department of Oral and Maxillofacial Surgery, University Medical Center Mainz, Augustusplatz 2, 55131 Mainz, Germany
| | - Anja Eckelt
- WEE-Solve GmbH, Auf der Burg 6, 55130 Mainz, Germany
| | - John Eckelt
- WEE-Solve GmbH, Auf der Burg 6, 55130 Mainz, Germany
| | - Jonathan Groß
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Till Opatz
- Department of Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Nadine Kommerein
- Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Straße 1, 30625 Hannover, Germany
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13
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Hosseini FS, Abedini AA, Chen F, Whitfield T, Ude CC, Laurencin CT. Oxygen-Generating Biomaterials for Translational Bone Regenerative Engineering. ACS Appl Mater Interfaces 2023; 15:50721-50741. [PMID: 36988393 DOI: 10.1021/acsami.2c20715] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Successful regeneration of critical-size defects remains one of the significant challenges in regenerative engineering. These large-scale bone defects are difficult to regenerate and are often reconstructed with matrices that do not provide adequate oxygen levels to stem cells involved in the regeneration process. Hypoxia-induced necrosis predominantly occurs in the center of large matrices since the host tissue's local vasculature fails to provide sufficient nutrients and oxygen. Indeed, utilizing oxygen-generating materials can overcome the central hypoxic region, induce tissue in-growth, and increase the quality of life for patients with extensive tissue damage. This article reviews recent advances in oxygen-generating biomaterials for translational bone regenerative engineering. We discussed different oxygen-releasing and delivery methods, fabrication methods for oxygen-releasing matrices, biology, oxygen's role in bone regeneration, and emerging new oxygen delivery methods that could potentially be used for bone regenerative engineering.
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Affiliation(s)
- Fatemeh S Hosseini
- Connecticut Convergence Institute for Translation in Regenerative Engineering, UConn Health, Farmington, Connecticut 06030, United States
- Raymond and Beverly Sackler Center for Biomedical, Biological, Physical and Engineering Sciences, UConn Health, Farmington, Connecticut 06030, United States
- Department of Skeletal Biology and Regeneration, UConn Health, Farmington, Connecticut 06030, United States
- Department of Orthopedic Surgery, UConn Health, Farmington, Connecticut 06030, United States
| | - Amir Abbas Abedini
- Connecticut Convergence Institute for Translation in Regenerative Engineering, UConn Health, Farmington, Connecticut 06030, United States
- Raymond and Beverly Sackler Center for Biomedical, Biological, Physical and Engineering Sciences, UConn Health, Farmington, Connecticut 06030, United States
- Department of Materials Science and Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Feiyang Chen
- Connecticut Convergence Institute for Translation in Regenerative Engineering, UConn Health, Farmington, Connecticut 06030, United States
| | - Taraje Whitfield
- Connecticut Convergence Institute for Translation in Regenerative Engineering, UConn Health, Farmington, Connecticut 06030, United States
- Raymond and Beverly Sackler Center for Biomedical, Biological, Physical and Engineering Sciences, UConn Health, Farmington, Connecticut 06030, United States
- Department of Skeletal Biology and Regeneration, UConn Health, Farmington, Connecticut 06030, United States
| | - Chinedu C Ude
- Connecticut Convergence Institute for Translation in Regenerative Engineering, UConn Health, Farmington, Connecticut 06030, United States
- Raymond and Beverly Sackler Center for Biomedical, Biological, Physical and Engineering Sciences, UConn Health, Farmington, Connecticut 06030, United States
- Department of Orthopedic Surgery, UConn Health, Farmington, Connecticut 06030, United States
| | - Cato T Laurencin
- Connecticut Convergence Institute for Translation in Regenerative Engineering, UConn Health, Farmington, Connecticut 06030, United States
- Raymond and Beverly Sackler Center for Biomedical, Biological, Physical and Engineering Sciences, UConn Health, Farmington, Connecticut 06030, United States
- Department of Skeletal Biology and Regeneration, UConn Health, Farmington, Connecticut 06030, United States
- Department of Orthopedic Surgery, UConn Health, Farmington, Connecticut 06030, United States
- Department of Biomedical Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Chemical and Bimolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Materials Science and Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
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14
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Zhu Y, Wang J, Patel SB, Li C, Head AR, Boscoboinik JA, Zhou G. Tuning the surface reactivity of oxides by peroxide species. Proc Natl Acad Sci U S A 2023; 120:e2215189120. [PMID: 36943886 PMCID: PMC10068848 DOI: 10.1073/pnas.2215189120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 01/21/2023] [Indexed: 03/23/2023] Open
Abstract
The Mars-van Krevelen mechanism is the foundation for oxide-catalyzed oxidation reactions and relies on spatiotemporally separated redox steps. Herein, we demonstrate the tunability of this separation with peroxide species formed by excessively adsorbed oxygen, thereby modifying the catalytic activity and selectivity of the oxide. Using CuO as an example, we show that a surface layer of peroxide species acts as a promotor to significantly enhance CuO reducibility in favor of H2 oxidation but conversely as an inhibitor to suppress CuO reduction against CO oxidation. Together with atomistic modeling, we identify that this opposite effect of the peroxide on the two oxidation reactions stems from its modification on coordinately unsaturated sites of the oxide surface. By differentiating the chemical functionality between lattice oxygen and peroxide, these results are closely relevant to a wide range of catalytic oxidation reactions using excessively adsorbed oxygen to activate lattice oxygen and tune the activity and selectivity of redox sites.
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Affiliation(s)
- Yaguang Zhu
- Department of Mechanical Engineering & Materials Science and Engineering Program, State University of New York, Binghamton, NY13902
| | - Jianyu Wang
- Department of Mechanical Engineering & Materials Science and Engineering Program, State University of New York, Binghamton, NY13902
| | - Shyam Bharatkumar Patel
- Department of Mechanical Engineering & Materials Science and Engineering Program, State University of New York, Binghamton, NY13902
| | - Chaoran Li
- Department of Mechanical Engineering & Materials Science and Engineering Program, State University of New York, Binghamton, NY13902
| | - Ashley R. Head
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY11973
| | | | - Guangwen Zhou
- Department of Mechanical Engineering & Materials Science and Engineering Program, State University of New York, Binghamton, NY13902
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15
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Norman MP, Edwards MJ, White GF, Burton JAJ, Butt JN, Richardson DJ, Louro RO, Paquete CM, Clarke TA. A Cysteine Pair Controls Flavin Reduction by Extracellular Cytochromes during Anoxic/Oxic Environmental Transitions. mBio 2023; 14:e0258922. [PMID: 36645302 DOI: 10.1128/mbio.02589-22] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Many bacteria of the genus Shewanella are facultative anaerobes able to reduce a broad range of soluble and insoluble substrates, including Fe(III) mineral oxides. Under anoxic conditions, the bacterium Shewanella oneidensis MR-1 uses a porin-cytochrome complex (Mtr) to mediate extracellular electron transfer (EET) across the outer membrane to extracellular substrates. However, it is unclear how EET prevents generating harmful reactive oxygen species (ROS) when exposed to oxic environments. The Mtr complex is expressed under anoxic and oxygen-limited conditions and contains an extracellular MtrC subunit. This has a conserved CX8C motif that inhibits aerobic growth when removed. This inhibition is caused by an increase in ROS that kills the majority of S. oneidensis cells in culture. To better understand this effect, soluble MtrC isoforms with modified CX8C were isolated. These isoforms produced increased concentrations of H2O2 in the presence of flavin mononucleotide (FMN) and greatly increased the affinity between MtrC and FMN. X-ray crystallography revealed that the molecular structure of MtrC isoforms was largely unchanged, while small-angle X-ray scattering suggested that a change in flexibility was responsible for controlling FMN binding. Together, these results reveal that FMN reduction in S. oneidensis MR-1 is controlled by the redox-active disulfide on the cytochrome surface. In the presence of oxygen, the disulfide forms, lowering the affinity for FMN and decreasing the rate of peroxide formation. This cysteine pair consequently allows the cell to respond to changes in oxygen level and survive in a rapidly transitioning environment. IMPORTANCE Bacteria that live at the oxic/anoxic interface have to rapidly adapt to changes in oxygen levels within their environment. The facultative anaerobe Shewanella oneidensis MR-1 can use EET to respire in the absence of oxygen, but on exposure to oxygen, EET could directly reduce extracellular oxygen and generate harmful reactive oxygen species that damage the bacterium. By modifying an extracellular cytochrome called MtrC, we show how preventing a redox-active disulfide from forming causes the production of cytotoxic concentrations of peroxide. The disulfide affects the affinity of MtrC for the redox-active flavin mononucleotide, which is part of the EET pathway. Our results demonstrate how a cysteine pair exposed on the surface controls the path of electron transfer, allowing facultative anaerobic bacteria to rapidly adapt to changes in oxygen concentration at the oxic/anoxic interface.
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16
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McCutcheon JN, Clabo DA. An atoms-in-molecules characterization of the nature of the OO bond in peroxides and nitroxide dimers. J Comput Chem 2023; 44:1278-1290. [PMID: 36732939 DOI: 10.1002/jcc.27082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 11/23/2022] [Accepted: 12/18/2022] [Indexed: 02/04/2023]
Abstract
The quantum theory of atoms-in-molecules (QTAIM) method is used to examine the OO bond in peroxides (RO-OR) and nitroxide dimers (R2 NO-ONR2 ), including Fremy's salt. The electron density (ρ), electron kinetic energy density [K(ρ)], and Laplacian of the electron density (∇2 ρ) at bond critical points characterize the nature of the OO bond. The data distinguish OO bonding of two kinds. Large values of ρ and positive ∇2 ρ and K(ρ) suggest that simple peroxides have charge-shift bonds. Nitroxide dimers, with smaller ρ, positive ∇2 ρ, and near-zero K(ρ), show a lack of shared electron density, suggesting there is no conventional OO bonding in these molecules. QTAIM analysis at the B3LYP/6-311+G(d,p) level of theory gives results in agreement with valence-bond theory and X-ray diffraction characterizations of peroxide OO bonds as charge-shift bonds. In contrast, CCSD/cc-pVDZ calculations fail to agree with previous results because of an insufficient, single-determinant treatment of the charge-shift bond.
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Affiliation(s)
- Jessica N McCutcheon
- Department of Chemistry, Francis Marion University, Florence, South Carolina, USA
| | - D Allen Clabo
- Department of Chemistry, Francis Marion University, Florence, South Carolina, USA
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17
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Hu S, Huo L, He J, Jin Y, Deng Y, Liu D. Ginseng glycoprotein and ginsenoside facilitate anti UV damage effects in diabetic rats. Front Pharmacol 2022; 13:1075594. [PMID: 36588701 PMCID: PMC9800513 DOI: 10.3389/fphar.2022.1075594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Accepted: 12/07/2022] [Indexed: 12/23/2022] Open
Abstract
Diabetes mellitus combined with ultraviolet (UV) radiation damage not only brings great mental stress to patients, but also seriously impairs their quality of life. A UV-irradiated diabetic rat trauma skin model was established by us to investigate the effects and possible mechanisms of ginsenoside and glycoprotein on skin trauma repair in UV-irradiated diabetic rats. In the study, ginsenosides and ginseng glycoproteins were extracted from different parts of ginseng roots. It found that it's easier to prepare saponins in ginseng bark and proteins in ginseng core in large quantities. Since glycoprotein-like metabolites are relatively novel ginseng extracts, specifically characterized its structures. It was verified that the ginseng glycoproteins are not toxic to HaCaT cells and can significantly increase the survival of HaCaT cells after UV damage at the in vitro cellular level. Experiments in vivo were conducted to evaluate the therapeutic effects of ginsenoside and ginseng glycoprotein in a rat model of diabetes mellitus combined with UV irradiation injury. Histopathological changes on rat skin after treatment with ginsenoside and ginseng glycoprotein were evaluated by hematoxylin and eosin (H&E) staining and aldehyde fuchsine staining. The expression levels of malondialdehyde (MDA), superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), matrix metalloproteinases (MMPs), hydroxyproline (HYP), interleukin-6 (IL-6), interleukin-1β (IL-1β), and tumor necrosis factor-α (TNF-α) were measured. The results indicate that both ginsenoside and ginseng glycoprotein could improve skin damage and ulcers caused by diabetes combined with UV irradiation and could alleviate a range of skin damage caused by the combination of diabetes and UV irradiation, including peroxidation and collagen fiber loss. Ginsenoside and ginseng glycoproteins can be considered as natural product candidates for the development of new drugs to treat diabetes combined with UV irradiation-induced skin damage.
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Affiliation(s)
- Shuang Hu
- School of Pharmacy, Changchun University of Chinese Medicine, Changchun, China
| | - Lulu Huo
- School of Pharmacy, Changchun University of Chinese Medicine, Changchun, China
| | - Jing He
- School of Pharmacy, Changchun University of Chinese Medicine, Changchun, China
| | - Ye Jin
- School of Pharmacy, Changchun University of Chinese Medicine, Changchun, China,*Correspondence: Ye Jin, ; Yongzhi Deng, ; Da Liu,
| | - Yongzhi Deng
- Department of Acupuncture and Massage, The Third Affiliated Hospital of Changchun University of Chinese Medicine, Changchun, China,*Correspondence: Ye Jin, ; Yongzhi Deng, ; Da Liu,
| | - Da Liu
- School of Pharmacy, Changchun University of Chinese Medicine, Changchun, China,*Correspondence: Ye Jin, ; Yongzhi Deng, ; Da Liu,
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18
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Luklová M, Novák J, Kopecká R, Kameniarová M, Gibasová V, Brzobohatý B, Černý M. Phytochromes and Their Role in Diurnal Variations of ROS Metabolism and Plant Proteome. Int J Mol Sci 2022; 23:ijms232214134. [PMID: 36430613 PMCID: PMC9695588 DOI: 10.3390/ijms232214134] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 11/12/2022] [Accepted: 11/13/2022] [Indexed: 11/18/2022] Open
Abstract
Plants are sessile organisms forced to adapt to environmental variations recurring in a day-night cycle. Extensive research has uncovered the transcriptional control of plants' inner clock and has revealed at least some part of the intricate and elaborate regulatory mechanisms that govern plant diel responses and provide adaptation to the ever-changing environment. Here, we analyzed the proteome of the Arabidopsis thaliana mutant genotypes collected in the middle of the day and the middle of the night, including four mutants in the phytochrome (phyA, phyB, phyC, and phyD) and the circadian clock protein LHY. Our approach provided a novel insight into the diel regulations, identifying 640 significant changes in the night-day protein abundance. The comparison with previous studies confirmed that a large portion of identified proteins was a known target of diurnal regulation. However, more than 300 were novel oscillations hidden under standard growth chamber conditions or not manifested in the wild type. Our results indicated a prominent role for ROS metabolism and phytohormone cytokinin in the observed regulations, and the consecutive analyses confirmed that. The cytokinin signaling significantly increased at night, and in the mutants, the hydrogen peroxide content was lower, and the night-day variation seemed to be lost in the phyD genotype. Furthermore, regulations in the lhy and phyB mutants were partially similar to those found in the catalase mutant cat2, indicating shared ROS-mediated signaling pathways. Our data also shed light on the role of the relatively poorly characterized Phytochrome D, pointing to its connection to glutathione metabolism and the regulation of glutathione S-transferases.
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Abstract
Significance: Limited oxygen availability (hypoxia) commonly occurs in a range of physiological and pathophysiological conditions, including embryonic development, physical exercise, inflammation, and ischemia. It is thus vital for cells and tissues to monitor their local oxygen availability to be able to adjust in case the oxygen supply is decreased. The cellular oxygen sensor factor inhibiting hypoxia-inducible factor (FIH) is the only known asparagine hydroxylase with hypoxia sensitivity. FIH uniquely combines oxygen and peroxide sensitivity, serving as an oxygen and oxidant sensor. Recent Advances: FIH was first discovered in the hypoxia-inducible factor (HIF) pathway as a modulator of HIF transactivation activity. Several other FIH substrates have now been identified outside the HIF pathway. Moreover, FIH enzymatic activity is highly promiscuous and not limited to asparagine hydroxylation. This includes the FIH-mediated catalysis of an oxygen-dependent stable (likely covalent) bond formation between FIH and selected substrate proteins (called oxomers [oxygen-dependent stable protein oligomers]). Critical Issues: The (patho-)physiological function of FIH is only beginning to be understood and appears to be complex. Selective pharmacologic inhibition of FIH over other oxygen sensors is possible, opening new avenues for therapeutic targeting of hypoxia-associated diseases, increasing the interest in its (patho-)physiological relevance. Future Directions: The contribution of FIH enzymatic activity to disease development and progression should be analyzed in more detail, including the assessment of underlying molecular mechanisms and relevant FIH substrate proteins. Also, the molecular mechanism(s) involved in the physiological functions of FIH remain(s) to be determined. Furthermore, the therapeutic potential of recently developed FIH-selective pharmacologic inhibitors will need detailed assessment. Antioxid. Redox Signal. 37, 913-935.
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Affiliation(s)
- Yulia L Volkova
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Christina Pickel
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | | | - Roland H Wenger
- Institute of Physiology, University of Zurich, Zurich, Switzerland
| | - Carsten C Scholz
- Institute of Physiology, University of Zurich, Zurich, Switzerland
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20
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Kluczkovski A, Bezerra L, Januário B, Lima E, Campelo P, Machado M, Bezerra J. Nuclear Magnetic Resonance Approach in Brazil Nut Oil and the Occurrence of Aflatoxins. J Oleo Sci 2022; 71:1439-1444. [PMID: 36089397 DOI: 10.5650/jos.ess22067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Carcinogenic metabolites of fungi such as aflatoxins play a toxic role in some tree nuts and need to be monitored in their by-products, such as oil. In this context, Brazil nut (Bertholletia excelsa) oil, which is a commodity of great economic importance to Brazil, requires attention to monitor the presence of these toxic agents. Therefore, this study aimed to evaluate the presence of aflatoxins in Brazil nut oil and relate it to the presence of fatty acids in the oil as a surveillance tool for food safety. Brazil nut oil samples (n= 25) were acquired in northern Brazil as (a) non-branded products (n= 07) produced by local farmers using artisanal methods from nuts to be discarded by the industry and (b) industrialized products (n= 18). The samples were analyzed for total aflatoxin content by high-performance liquid chromatography and fatty acid content by nuclear magnetic resonance imaging. Seven (28%) samples were positive for the aflatoxin fractions (B1 + B2 + G1 + G2), ranging from undetected (<2.32) to 50.87 μg/kg. Of the aflatoxin positive samples evaluated by NMR analysis, it was not possible to state that the presence of a particular fatty acid can interfere or influence aflatoxin contamination. This was the first study with data on aflatoxin occurrence in Brazil nut oil. Nevertheless, further research is required to relate saturated or unsaturated fatty acid content with aflatoxin levels. We also suggest the implementation of systems to prevent contamination of the raw materials (seed) and detoxification of the oil to guarantee the product's safety and quality.
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Affiliation(s)
| | - Leticia Bezerra
- Faculty of Pharmaceutical Sciences, Federal University of Amazonas
| | - Beatriz Januário
- Faculty of Pharmaceutical Sciences, Federal University of Amazonas
| | - Emerson Lima
- Faculty of Pharmaceutical Sciences, Federal University of Amazonas
| | - Pedro Campelo
- College of Agricultural Sciences, Federal University of Amazonas
| | | | - Jaqueline Bezerra
- Analitic Central, Campus Manaus Centro, Institute of Education, Science and Technology of Amazonas
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21
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Lavoie JC, Mohamed I, Teixeira V. Dose-Response Effects of Glutathione Supplement in Parenteral Nutrition on Pulmonary Oxidative Stress and Alveolarization in Newborn Guinea Pig. Antioxidants (Basel) 2022; 11:antiox11101956. [PMID: 36290679 PMCID: PMC9598316 DOI: 10.3390/antiox11101956] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 09/17/2022] [Accepted: 09/26/2022] [Indexed: 11/21/2022] Open
Abstract
In premature infants, glutathione deficiency impairs the capacity to detoxify the peroxides resulting from O2 metabolism and those contaminating the parenteral nutrition (PN) leading to increased oxidative stress, which is a major contributor to bronchopulmonary dysplasia (BPD) development. In animals, the supplementation of PN with glutathione prevented the induction of pulmonary oxidative stress and hypoalveolarization (characteristic of BPD). Hypothesis: the dose of glutathione that corrects the plasma glutathione deficiency is sufficient to prevent oxidative stress and preserve pulmonary integrity. Three-day-old guinea pigs received a PN, supplemented or not with GSSG (up to 1300 µg/kg/d), the stable form of glutathione in PN. Animals with no handling other than being orally fed constituted the control group. After 4 days, lungs were removed to determine the GSH, GSSG, redox potential and the alveolarization index. Total plasma glutathione was quantified. The effective dose to improve pulmonary GSH and prevent the loss of alveoli was 330 µg/kg/d. A 750 µg/kg/d dose corrected the low-plasma glutathione, high-pulmonary GSSG and oxidized redox potential. Therefore, the results suggest that, in a clinical setting, the dose that improves low-plasma glutathione could be effective in preventing BPD development.
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Affiliation(s)
- Jean-Claude Lavoie
- Research Center of the CHU Sainte-Justine, Department of Nutrition, Université de Montréal, Montréal, QC H3T 1C5, Canada
- Correspondence:
| | - Ibrahim Mohamed
- Research Center of the CHU Sainte-Justine, Department of Paediatrics, Université de Montréal, Montréal, QC H3T 1C5, Canada
| | - Vitor Teixeira
- Research Center of the CHU Sainte-Justine, Department of Nutrition, Université de Montréal, Montréal, QC H3T 1C5, Canada
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22
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Berzin F, Vergnes B. Time/Molecular Weight Superposition to Describe the Behavior of Controlled-Rheology Polypropylenes. Polymers (Basel) 2022; 14:polym14163398. [PMID: 36015654 PMCID: PMC9414965 DOI: 10.3390/polym14163398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 08/12/2022] [Accepted: 08/17/2022] [Indexed: 12/02/2022] Open
Abstract
Polypropylene resins issuing from polymerization reactors are degraded by peroxides in subsequent reactive extrusion processes to improve their processability. This operation reduces their molecular weight and, thus, their viscosity and elasticity. In a previous study, a series of homo- and copolymer polypropylenes of different molecular weight distributions were prepared by twin-screw extrusion and characterized by oscillatory rheometry. It was shown that their behavior could be described by Carreau–Yasuda equations, possibly with a yield stress, in which all parameters depended on the weight average molecular weight. By using these experimental data, it is show in the present study that a time/molecular weight superposition allowed for a drastic reduction in the number of parameters to be considered in order to precisely describe the viscous behavior of these materials. This concept was then validated by applying it to various experimental data from the bibliography.
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Affiliation(s)
- Françoise Berzin
- Fractionnement des Agro-Rsources et Environnement, University of Reims Champagne Ardenne, INRAE, 51100 Reims, France
| | - Bruno Vergnes
- CEMEF, UMR CNRS 7635, Mines Paris—PSL, CS 10207, 06904 Sophia-Antipolis, France
- Correspondence:
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23
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Figueira TR, Castilho RF. Insights on how mitochondrial NAD(P) + transhydrogenase plays a central metabolic role in proinflammatory macrophages. Am J Physiol Cell Physiol 2022; 323:C648-C649. [PMID: 35938879 DOI: 10.1152/ajpcell.00090.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Tiago R Figueira
- School of Physical Education and Sport of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, Brazil
| | - Roger F Castilho
- School of Medical Sciences, Department of Pathology, University of Campinas (UNICAMP), Campinas, Brazil
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24
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Stastny AL, Doepke A, Streicher RP. A field-portable colorimetric method for the measurement of peracetic acid vapors: a comparison of glass and plastic impingers. J Occup Environ Hyg 2022; 19:469-477. [PMID: 35709479 PMCID: PMC9458618 DOI: 10.1080/15459624.2022.2088772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
A method for measuring peracetic acid vapors in air using impinger sampling and field-portable colorimetric analysis is presented. The capture efficiency of aqueous media in glass and plastic impingers was evaluated when used for peracetic acid vapor sampling. Measurement of peracetic acid was done using an N,N-diethyl-p-phenylenediamine colorimetric method with a field-portable spectrometer. The linearity of the N,N-diethyl-p-phenylenediamine method was determined for peracetic acid both in solution and captured from vapor phase using glass or plastic impingers. The Limits of Detection for the glass and plastic impingers were 0.24 mg/m3 and 0.28 mg/m3, respectively, for a 15 L air sample. The Limits of Quantitation were 0.79 mg/m3 and 0.92 mg/m3 for the glass and plastic impingers, respectively. Both metrics were below the American Conference of Governmental Industrial Hygienists Threshold Limit Value Short-Term Exposure Limit of 1.24 mg/m3 (0.4 ppmv) during a 15-min period. The impinger sampling method presented herein allows for an easy-to-use and rapid in-field measurement that can be used for evaluating occupational exposure to peracetic acid.
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Affiliation(s)
- Angela L Stastny
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Cincinnati, Ohio
| | - Amos Doepke
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Cincinnati, Ohio
| | - Robert P Streicher
- Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Cincinnati, Ohio
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25
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Conway R, Rockhold JD, SantaCruz-Calvo S, Zukowski E, Pugh GH, Hasturk H, Kern PA, Nikolajczyk BS, Bharath LP. Obesity and Fatty Acids Promote Mitochondrial Translocation of STAT3 Through ROS-Dependent Mechanisms. Front Aging 2022; 3:924003. [PMID: 35928250 PMCID: PMC9344057 DOI: 10.3389/fragi.2022.924003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 06/08/2022] [Indexed: 11/29/2022]
Abstract
Obesity promotes the onset and progression of metabolic and inflammatory diseases such as type 2 diabetes. The chronic low-grade inflammation that occurs during obesity triggers multiple signaling mechanisms that negatively affect organismal health. One such mechanism is the persistent activation and mitochondrial translocation of STAT3, which is implicated in inflammatory pathologies and many types of cancers. STAT3 in the mitochondria (mitoSTAT3) alters electron transport chain activity, thereby influencing nutrient metabolism and immune response. PBMCs and CD4+ T cells from obese but normal glucose-tolerant (NGT) middle-aged subjects had higher phosphorylation of STAT3 on residue serine 727 and more mitochondrial accumulation of STAT3 than cells from lean subjects. To evaluate if circulating lipid overabundance in obesity is responsible for age- and sex-matched mitoSTAT3, cells from lean subjects were challenged with physiologically relevant doses of the saturated and monounsaturated fatty acids, palmitate and oleate, respectively. Fatty acid treatment caused robust accumulation of mitoSTAT3 in all cell types, which was independent of palmitate-induced impairments in autophagy. Co-treatment of cells with fatty acid and trehalose prevented STAT3 phosphorylation and mitochondrial accumulation in an autophagy-independent but cellular peroxide-dependent mechanism. Pharmacological blockade of mitoSTAT3 either by a mitochondria-targeted STAT3 inhibitor or ROS scavenging prevented obesity and fatty acid-induced production of proinflammatory cytokines IL-17A and IL-6, thus establishing a mechanistic link between mitoSTAT3 and inflammatory cytokine production.
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Affiliation(s)
- Rachel Conway
- Department of Nutrition and Public Health, Merrimack College, North Andover, MA, United States
| | - Jack Donato Rockhold
- Department of Nutrition and Public Health, Merrimack College, North Andover, MA, United States
| | - Sara SantaCruz-Calvo
- Department of Pharmacology and Nutritional Sciences, University of Kentucky, Lexington, KY, United States
- Barnstable Brown Diabetes and Obesity Center, University of Kentucky, Lexington, KY, United States
| | - Emelia Zukowski
- Department of Nutrition and Public Health, Merrimack College, North Andover, MA, United States
| | - Gabriella H. Pugh
- Department of Microbiology, Immunology and Molecular Genetics, University of Kentucky, Lexington, KY, United States
| | | | - Philip A. Kern
- Barnstable Brown Diabetes and Obesity Center, University of Kentucky, Lexington, KY, United States
- Department of Medicine, University of Kentucky, Lexington, KY, United States
| | - Barbara S. Nikolajczyk
- Department of Pharmacology and Nutritional Sciences, University of Kentucky, Lexington, KY, United States
- Barnstable Brown Diabetes and Obesity Center, University of Kentucky, Lexington, KY, United States
| | - Leena P. Bharath
- Department of Nutrition and Public Health, Merrimack College, North Andover, MA, United States
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Hayichelaeh C, Nun-Anan P, Purbaya M, Boonkerd K. Unfilled Natural Rubber Compounds Containing Bio-Oil Cured with Different Curing Systems: A Comparative Study. Polymers (Basel) 2022; 14:2479. [PMID: 35746055 DOI: 10.3390/polym14122479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 06/11/2022] [Accepted: 06/13/2022] [Indexed: 11/21/2022] Open
Abstract
This study focuses on the properties of unfilled natural rubber compounds containing bio-oils cured with a peroxide curing system and then discusses the comparisons to those cured using the sulfur system from our previous work. Two types of bio-oils, i.e., palm oil and soybean oil, were used, and distillate aromatic extract (DAE)-based petroleum oil was employed as a reference. The bio-oils caused no significant change in the vulcanization of rubber compounds cured using peroxide. However, the compounds containing bio-oils and cured with sulfur showed a faster vulcanization than the ones with DAE. The bio-oils strongly affected the crosslink density of rubber compounds in both curing systems. The use of bio-oils caused a low crosslink density due to the possible implication of curing agents to bio-oil molecules. The properties of rubber compounds dependent on the different levels of crosslink density were also investigated. The results revealed that when the crosslink density increased, the modulus, tensile strength, and hardness of the rubber compounds increased and the elongation at break and compression set decreased. The use of bio-oils in the rubber compounds cured with different curing systems gave low modulus at 300% strain, tensile strength, and hardness but high elongation at break and compression set when compared to the ones with DAE. However, no significant change was observed for the compression set of the rubber compounds cured using sulfur. With the presence of bio-oils, the properties of rubber compounds cured with sulfur system deteriorated less than those of the ones cured with peroxide.
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Katharios-Lanwermeyer S, O'Toole GA. Biofilm Maintenance as an Active Process: Evidence that Biofilms Work Hard to Stay Put. J Bacteriol 2022;:e0058721. [PMID: 35311557 DOI: 10.1128/jb.00587-21] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Biofilm formation represents a critical strategy whereby bacteria can tolerate otherwise damaging environmental stressors and antimicrobial insults. While the mechanisms bacteria use to establish a biofilm and disperse from these communities have been well-studied, we have only a limited understanding of the mechanisms required to maintain these multicellular communities. Indeed, until relatively recently, it was not clear that maintaining a mature biofilm could be considered an active, regulated process with dedicated machinery. Using Pseudomonas aeruginosa as a model system, we review evidence from recent studies that support the model that maintenance of these persistent, surface-attached communities is indeed an active process. Biofilm maintenance mechanisms include transcriptional regulation and second messenger signaling (including the production of extracellular polymeric substances). We also discuss energy-conserving pathways that play a key role in the maintenance of these communities. We hope to highlight the need for further investigation to uncover novel biofilm maintenance pathways and suggest the possibility that such pathways can serve as novel antibiofilm targets.
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Ben Atitallah I, Antonopoulou G, Ntaikou I, Soto Beobide A, Dracopoulos V, Mechichi T, Lyberatos G. A Comparative Study of Various Pretreatment Approaches for Bio-Ethanol Production from Willow Sawdust, Using Co-Cultures and Mono-Cultures of Different Yeast Strains. Molecules 2022; 27:molecules27041344. [PMID: 35209130 PMCID: PMC8875012 DOI: 10.3390/molecules27041344] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 02/10/2022] [Accepted: 02/14/2022] [Indexed: 11/16/2022] Open
Abstract
The effect of different pretreatment approaches based on alkali (NaOH)/hydrogen peroxide (H2O2) on willow sawdust (WS) biomass, in terms of delignification efficiency, structural changes of lignocellulose and subsequent fermentation toward ethanol, was investigated. Bioethanol production was carried out using the conventional yeast Saccharomyces cerevisiae, as well as three non-conventional yeasts strains, i.e., Pichia stipitis, Pachysolen tannophilus, Wickerhamomyces anomalus X19, separately and in co-cultures. The experimental results showed that a two-stage pretreatment approach (NaOH (0.5% w/v) for 24 h and H2O2 (0.5% v/v) for 24 h) led to higher delignification (38.3 ± 0.1%) and saccharification efficiency (31.7 ± 0.3%) and higher ethanol concentration and yield. Monocultures of S. cerevisiae or W. anomalus X19 and co-cultures with P. stipitis exhibited ethanol yields in the range of 11.67 ± 0.21 to 13.81 ± 0.20 g/100 g total solids (TS). When WS was subjected to H2O2 (0.5% v/v) alone for 24 h, the lowest ethanol yields were observed for all yeast strains, due to the minor impact of this treatment on the main chemical and structural WS characteristics. In order to decide which is the best pretreatment approach, a detailed techno-economical assessment is needed, which will take into account the ethanol yields and the minimum processing cost.
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Affiliation(s)
- Imen Ben Atitallah
- Laboratory of Biochemistry and Enzyme Engineering of Lipases, National School of Engineers of Sfax, University of Sfax, BP 1173, Sfax 3038, Tunisia; (I.B.A.); (T.M.)
| | - Georgia Antonopoulou
- Institute of Chemical Engineering Sciences (FORTH/ICE-HT), Stadiou, Platani, GR 26504 Patras, Greece; (I.N.); (A.S.B.); (V.D.); (G.L.)
- Correspondence: ; Tel.: +30-261-096-5318
| | - Ioanna Ntaikou
- Institute of Chemical Engineering Sciences (FORTH/ICE-HT), Stadiou, Platani, GR 26504 Patras, Greece; (I.N.); (A.S.B.); (V.D.); (G.L.)
| | - Amaia Soto Beobide
- Institute of Chemical Engineering Sciences (FORTH/ICE-HT), Stadiou, Platani, GR 26504 Patras, Greece; (I.N.); (A.S.B.); (V.D.); (G.L.)
| | - Vassilios Dracopoulos
- Institute of Chemical Engineering Sciences (FORTH/ICE-HT), Stadiou, Platani, GR 26504 Patras, Greece; (I.N.); (A.S.B.); (V.D.); (G.L.)
| | - Tahar Mechichi
- Laboratory of Biochemistry and Enzyme Engineering of Lipases, National School of Engineers of Sfax, University of Sfax, BP 1173, Sfax 3038, Tunisia; (I.B.A.); (T.M.)
| | - Gerasimos Lyberatos
- Institute of Chemical Engineering Sciences (FORTH/ICE-HT), Stadiou, Platani, GR 26504 Patras, Greece; (I.N.); (A.S.B.); (V.D.); (G.L.)
- School of Chemical Engineering, National Technical University of Athens, GR 15780 Athens, Greece
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Abstract
Small RNAs (sRNAs) are important gene regulators in bacteria, but it is unclear how new sRNAs originate and become part of regulatory networks that coordinate bacterial response to environmental stimuli. Using a covariance modeling-based approach, we analyzed the presence of hundreds of sRNAs in more than a thousand genomes across Enterobacterales, a bacterial order with a confluence of factors that allows robust genome-scale sRNA analyses: several well-studied organisms with fairly conserved genome structures, an established phylogeny, and substantial nucleotide diversity within a narrow evolutionary space. We discovered that a majority of sRNAs arose recently, and uncovered protein-coding genes as a potential source from which new sRNAs arise. A detailed investigation of the emergence of OxyS, a peroxide-responding sRNA, revealed that it evolved from a fragment of a peroxidase messenger RNA. Importantly, although it replaced the ancestral peroxidase, OxyS continues to be part of the ancestral peroxide-response regulon, indicating that an sRNA that arises from a protein-coding gene would inherently be part of the parental protein's regulatory network. This new insight provides a fresh framework for understanding sRNA origin and regulatory integration in bacteria.
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Affiliation(s)
- Madeline C Krieger
- Department of Biology, Portland State University, Portland, OR, USA
- Department of Restorative Dentistry, School of Dentistry, Oregon Health and Science University, Portland, OR, USA
| | - H Auguste Dutcher
- Department of Biology, Portland State University, Portland, OR, USA
- Laboratory of Genetics and Center for Genomic Science Innovation, University of Wisconsin-Madison, Madison, WI, USA
| | - Andrew J Ashford
- Department of Biology, Portland State University, Portland, OR, USA
- Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, OR, USA
| | - Rahul Raghavan
- Department of Biology, Portland State University, Portland, OR, USA
- Department of Molecular Microbiology and Immunology, The University of Texas at San Antonio, San Antonio, TX, USA
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30
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Azadmanesh J, Lutz WE, Coates L, Weiss KL, Borgstahl GEO. Cryotrapping peroxide in the active site of human mitochondrial manganese superoxide dismutase crystals for neutron diffraction. Acta Crystallogr F Struct Biol Commun 2022; 78:8-16. [PMID: 34981770 PMCID: PMC8725007 DOI: 10.1107/s2053230x21012413] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 11/22/2021] [Indexed: 12/28/2022] Open
Abstract
Structurally identifying the enzymatic intermediates of redox proteins has been elusive due to difficulty in resolving the H atoms involved in catalysis and the susceptibility of ligand complexes to photoreduction from X-rays. Cryotrapping ligands for neutron protein crystallography combines two powerful tools that offer the advantage of directly identifying hydrogen positions in redox-enzyme intermediates without radiolytic perturbation of metal-containing active sites. However, translating cryogenic techniques from X-ray to neutron crystallography is not straightforward due to the large crystal volumes and long data-collection times. Here, methods have been developed to visualize the evasive peroxo complex of manganese superoxide dismutase (MnSOD) so that all atoms, including H atoms, could be visualized. The subsequent cryocooling and ligand-trapping methods resulted in neutron data collection to 2.30 Å resolution. The P6122 crystal form of MnSOD is challenging because it has some of the largest unit-cell dimensions (a = b = 77.8, c = 236.8 Å) ever studied using high-resolution cryo-neutron crystallography. The resulting neutron diffraction data permitted the visualization of a dioxygen species bound to the MnSOD active-site metal that was indicative of successful cryotrapping.
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Affiliation(s)
- Jahaun Azadmanesh
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, NE 68198-6805, USA
| | - William E. Lutz
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, NE 68198-6805, USA
| | - Leighton Coates
- Second Target Station, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831, USA
| | - Kevin L. Weiss
- Neutron Scattering Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN 37831, USA
| | - Gloria E. O. Borgstahl
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, NE 68198-6805, USA
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Pillay CS, John N. Can thiol-based redox systems be utilized as parts for synthetic biology applications? Redox Rep 2021; 26:147-159. [PMID: 34378494 PMCID: PMC8366655 DOI: 10.1080/13510002.2021.1966183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
OBJECTIVES Synthetic biology has emerged from molecular biology and engineering approaches and aims to develop novel, biologically-inspired systems for industrial and basic research applications ranging from biocomputing to drug production. Surprisingly, redoxin (thioredoxin, glutaredoxin, peroxiredoxin) and other thiol-based redox systems have not been widely utilized in many of these synthetic biology applications. METHODS We reviewed thiol-based redox systems and the development of synthetic biology applications that have used thiol-dependent parts. RESULTS The development of circuits to facilitate cytoplasmic disulfide bonding, biocomputing and the treatment of intestinal bowel disease are amongst the applications that have used thiol-based parts. We propose that genetically encoded redox sensors, thiol-based biomaterials and intracellular hydrogen peroxide generators may also be valuable components for synthetic biology applications. DISCUSSION Thiol-based systems play multiple roles in cellular redox metabolism, antioxidant defense and signaling and could therefore offer a vast and diverse portfolio of components, parts and devices for synthetic biology applications. However, factors limiting the adoption of redoxin systems for synthetic biology applications include the orthogonality of thiol-based components, limitations in the methods to characterize thiol-based systems and an incomplete understanding of the design principles of these systems.
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Affiliation(s)
- Ché S. Pillay
- School of Life Sciences, University of KwaZulu-Natal, Pietermaritzburg, South Africa
| | - Nolyn John
- School of Life Sciences, University of KwaZulu-Natal, Pietermaritzburg, South Africa
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Thumwong A, Poltabtim W, Kerdsang P, Saenboonruang K. Roles of Chitosan as Bio-Fillers in Radiation-Vulcanized Natural Rubber Latex and Hybrid Radiation and Peroxide-Vulcanized Natural Rubber Latex: Physical/Mechanical Properties under Thermal Aging and Biodegradability. Polymers (Basel) 2021; 13:polym13223940. [PMID: 34833239 PMCID: PMC8618650 DOI: 10.3390/polym13223940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 10/29/2021] [Accepted: 11/09/2021] [Indexed: 11/20/2022] Open
Abstract
Although natural rubber was regarded as biodegradable, the degradation is a time-consuming process that could take weeks or months for any degradation or substantial weight loss to be observable, resulting in the need for novel processes/methods to accelerate the rubber degradation. As a result, this work investigated the potential utilization of chitosan (CS) as a biodegradation enhancer for radiation-vulcanized natural rubber latex (R-VNRL) and hybrid radiation and peroxide-vulcanized natural rubber latex (RP-VNRL) composites, with varying CS contents (0, 2, 4, or 6 phr). The R-VNRL samples were prepared using 15 kGy gamma irradiation, while the RP-VNRL samples were prepared using a combination of 0.1 phr tert-butyl hydroperoxide (t-BHPO) and 10 kGy gamma irradiation. The properties investigated were biodegradability in the soil and the morphological, chemical, mechanical, and physical properties, both before and after undergoing thermal aging. The results indicated that the biodegradability of both the R-VNRL and RP-VNRL composites was enhanced with the addition of CS, as evidenced by increases in the percentage weight loss (% weight loss) after being buried in soil for 8 weeks from 6.5 ± 0.1% and 6.4 ± 0.1% in a pristine R-VNRL and RP-VNRL samples, respectively, to 10.5 ± 0.1% and 10.2 ± 0.1% in 6-pph CS/R-VNRL and 6-pph CS/RP-VNRL composites, respectively, indicating the biodegradation enhancement of approximately 60%. In addition, the results revealed that the addition of CS could increase the value of tensile modulus by 119%, while decrease the values of tensile strength and elongation at break by 50% and 43%, respectively, in the specimens containing 6-phr CS. In terms of the color appearances, the samples were lighter and yellower after the addition of CS, as evidenced by the noticeably increased L* and b* values, based on the CIE L*a*b* color space system. Furthermore, the investigation into the effects of thermal aging showed that the overall tensile properties for both curing systems were reduced, while varying degrees of color change were observed, with the pristine R-VNRL and RP-VNRL samples having more pronounced degradation/changes for both properties. In conclusion, the overall results suggested that CS had great potential to be applied as a bio-filler in R-VNRL and RP-VNRL composites to effectively promote the biodegradability, environmental friendliness, and resistance to thermal degradation of the composites.
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Affiliation(s)
- Arkarapol Thumwong
- Department of Applied Radiation and Isotopes, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand; (A.T.); (W.P.); (P.K.)
- Department of Materials Science, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
| | - Worawat Poltabtim
- Department of Applied Radiation and Isotopes, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand; (A.T.); (W.P.); (P.K.)
| | - Patcharaporn Kerdsang
- Department of Applied Radiation and Isotopes, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand; (A.T.); (W.P.); (P.K.)
| | - Kiadtisak Saenboonruang
- Department of Applied Radiation and Isotopes, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand; (A.T.); (W.P.); (P.K.)
- Specialized Center of Rubber and Polymer Materials in Agriculture and Industry (RPM), Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
- Special Research Unit of Radiation Technology for Advanced Materials, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
- Correspondence: ; Tel.: +662-562-5555 (ext. 646219)
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Kumar A, Vaish M, Karuppagounder SS, Gazaryan I, Cave JW, Starkov AA, Anderson ET, Zhang S, Pinto JT, Rountree AM, Wang W, Sweet IR, Ratan RR. HIF1α stabilization in hypoxia is not oxidant-initiated. eLife 2021; 10:72873. [PMID: 34596045 PMCID: PMC8530508 DOI: 10.7554/elife.72873] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 09/19/2021] [Indexed: 01/08/2023] Open
Abstract
Hypoxic adaptation mediated by HIF transcription factors requires mitochondria, which have been implicated in regulating HIF1α stability in hypoxia by distinct models that involve consuming oxygen or alternatively converting oxygen into the second messenger peroxide. Here, we use a ratiometric, peroxide reporter, HyPer to evaluate the role of peroxide in regulating HIF1α stability. We show that antioxidant enzymes are neither homeostatically induced nor are peroxide levels increased in hypoxia. Additionally, forced expression of diverse antioxidant enzymes, all of which diminish peroxide, had disparate effects on HIF1α protein stability. Moreover, decrease in lipid peroxides by glutathione peroxidase-4 or superoxide by mitochondrial SOD, failed to influence HIF1α protein stability. These data show that mitochondrial, cytosolic or lipid ROS were not necessary for HIF1α stability, and favor a model where mitochondria contribute to hypoxic adaptation as oxygen consumers.
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Affiliation(s)
- Amit Kumar
- Burke Neurological Institute, White Plains, New York, United States.,Brain and Mind Research Institute, Weill Medical College of Cornell University, New York, United States.,Department of Neurology, Weill Medical College of Cornell University, New York, United States
| | - Manisha Vaish
- Burke Neurological Institute, White Plains, New York, United States.,Pandemic Response Lab, New York, United States
| | - Saravanan S Karuppagounder
- Burke Neurological Institute, White Plains, New York, United States.,Brain and Mind Research Institute, Weill Medical College of Cornell University, New York, United States.,Department of Neurology, Weill Medical College of Cornell University, New York, United States
| | - Irina Gazaryan
- Department of Anatomy and Cell Biology, New York Medical College, New York, United States
| | - John W Cave
- Burke Neurological Institute, White Plains, New York, United States.,Brain and Mind Research Institute, Weill Medical College of Cornell University, New York, United States.,Department of Neurology, Weill Medical College of Cornell University, New York, United States
| | - Anatoly A Starkov
- Brain and Mind Research Institute, Weill Medical College of Cornell University, New York, United States.,Department of Neurology, Weill Medical College of Cornell University, New York, United States
| | | | - Sheng Zhang
- Institute for Biotechnology, Cornell University, Ithaca, United States
| | - John T Pinto
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, United States
| | - Austin M Rountree
- Department of Medicine, University of Washington, Seattle, United States
| | - Wang Wang
- Department of Pain and Anesthesiology, University of Washington, Seattle, United States
| | - Ian R Sweet
- Department of Medicine, University of Washington, Seattle, United States
| | - Rajiv R Ratan
- Burke Neurological Institute, White Plains, New York, United States.,Brain and Mind Research Institute, Weill Medical College of Cornell University, New York, United States.,Department of Neurology, Weill Medical College of Cornell University, New York, United States
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Schakowski KM, Elm C, Linders J, Kirsch M. Synthesis and characterization of enzymatically active micrometer protein-capsules. Artif Cells Nanomed Biotechnol 2021; 49:606-613. [PMID: 34559040 DOI: 10.1080/21691401.2021.1955698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
This work describes a general method for the encapsulation of enzymes with albumin as wall material and the enzyme catalase as prime example. Care was taken for the preparation of biochemically active sub-micrometer particles in order to prevent oxygen toxicity induced by artificial oxygen carriers of any type. In cell culture experiments, capsules containing catalase did not exhibit any harmful activities in the absence of peroxides. In the presence of hydrogen peroxide application of low and medium dosed capsules below 0.05 vol% (final concentration 0.001 vol%) even increased the cell damaging process. However, a higher dosage of capsules (>0.05 vol%) prevented completely cellular disruption induced by 5 mM hydrogen peroxide and decreased up to 90% of cellular damage at higher peroxide concentrations. These results demonstrated that encapsulated catalase was enzymatically active and the over-all activity of prepared catalase capsules was determined to be >1900 U mL-1 vol%-1.
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Affiliation(s)
- Kai Melvin Schakowski
- Institute of Physiological Chemistry, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Christian Elm
- Institute of Physiological Chemistry, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Jürgen Linders
- Department of Physical Chemistry, University of Duisburg-Essen, Essen, Germany.,Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Duisburg, Germany
| | - Michael Kirsch
- Institute of Physiological Chemistry, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
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35
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Cardoso PSM, Ueki MM, Barbosa JDV, Garcia Filho FC, Lazarus BS, Azevedo JB. The Effect of Dialkyl Peroxide Crosslinking on the Properties of LLDPE and UHMWPE. Polymers (Basel) 2021; 13:3062. [PMID: 34577963 PMCID: PMC8470150 DOI: 10.3390/polym13183062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 08/31/2021] [Accepted: 09/07/2021] [Indexed: 11/30/2022] Open
Abstract
Peroxide has been considered a chemical agent that can be used to tune the properties of polymeric materials. This research evaluated the influence of different concentrations of dialkyl peroxides on the mechanical, thermal, and morphological properties of linear low-density polyethylene (LLDPE) and ultra-high molecular weight polyethylene (UHMWPE). The neat polymer, as well as those with the addition of 1% and 2% by mass of dialkyl peroxides, were subjected to compression molding and immersion in water for 1 h, under controlled temperatures of 90 °C. The values of the gel content found in the samples indicated that the addition of peroxide to the LLDPE and to the UHMWPE promoted the formation of a reticulated network. The structure obtained by the crosslinking led to less reorganization of the chains during the crystallization process, resulting in the formation of imperfect crystals and, consequently, in the reduction in melting temperatures, crystallization and enthalpy. The mechanical properties were altered with the presence of the crosslinker. The polymers presented had predominant characteristics of a ductile material, with the occurrence of crazing with an increased peroxide content.
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Affiliation(s)
- Pollyana S. M. Cardoso
- Department of Materials, University Center SENAI CIMATEC, Salvador 41650-010, BA, Brazil;
- Graduate Program in Materials Science and Engineering—P2CEM, Federal University of Sergipe (UFS), Aracaju 49100-000, SE, Brazil;
| | - Marcelo M. Ueki
- Graduate Program in Materials Science and Engineering—P2CEM, Federal University of Sergipe (UFS), Aracaju 49100-000, SE, Brazil;
| | - Josiane D. V. Barbosa
- Department of Materials, University Center SENAI CIMATEC, Salvador 41650-010, BA, Brazil;
| | | | - Benjamin S. Lazarus
- Materials Science and Engineering Program, University of Califórnia San Diego, San Diego, CA 92093, USA;
| | - Joyce B. Azevedo
- Institute of Science, Technology and Innovation, Federal University of Bahia, Salvador 42809-000, BA, Brazil;
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Cesinger MR, Schwardt NH, Halsey CR, Thomason MK, Reniere ML. Investigating the Roles of Listeria monocytogenes Peroxidases in Growth and Virulence. Microbiol Spectr 2021; 9:e0044021. [PMID: 34287055 PMCID: PMC8552690 DOI: 10.1128/spectrum.00440-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 06/23/2021] [Indexed: 11/25/2022] Open
Abstract
Bacteria have necessarily evolved a protective arsenal of proteins to contend with peroxides and other reactive oxygen species generated in aerobic environments. Listeria monocytogenes encounters an onslaught of peroxide both in the environment and during infection of the mammalian host, where it is the causative agent of the foodborne illness listeriosis. Despite the importance of peroxide for the immune response to bacterial infection, the strategy by which L. monocytogenes protects against peroxide toxicity has yet to be illuminated. Here, we investigated the expression and essentiality of all the peroxidase-encoding genes during L. monocytogenes growth in vitro and during infection of murine cells in tissue culture. We found that chdC and kat were required for aerobic growth in vitro, and fri and ahpA were each required for L. monocytogenes to survive acute peroxide stress. Despite increased expression of fri, ahpA, and kat during infection of macrophages, only fri proved necessary for cytosolic growth. In contrast, the proteins encoded by lmo0367, lmo0983, tpx, lmo1609, and ohrA were dispensable for aerobic growth, acute peroxide detoxification, and infection. Together, our results provide insight into the multifaceted L. monocytogenes peroxide detoxification strategy and demonstrate that L. monocytogenes encodes a functionally diverse set of peroxidase enzymes. IMPORTANCE Listeria monocytogenes is a facultative intracellular pathogen and the causative agent of the foodborne illness listeriosis. L. monocytogenes must contend with reactive oxygen species generated extracellularly during aerobic growth and intracellularly by the host immune system. However, the mechanisms by which L. monocytogenes defends against peroxide toxicity have not yet been defined. Here, we investigated the roles of each of the peroxidase-encoding genes in L. monocytogenes growth, peroxide stress response, and virulence in mammalian cells.
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Affiliation(s)
- Monica R. Cesinger
- Department of Microbiology, University of Washington School of Medicine, Seattle, Washington, USA
| | - Nicole H. Schwardt
- Department of Microbiology, University of Washington School of Medicine, Seattle, Washington, USA
| | - Cortney R. Halsey
- Department of Microbiology, University of Washington School of Medicine, Seattle, Washington, USA
| | - Maureen K. Thomason
- Department of Microbiology, University of Washington School of Medicine, Seattle, Washington, USA
| | - Michelle L. Reniere
- Department of Microbiology, University of Washington School of Medicine, Seattle, Washington, USA
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Gagnon J, Caron V, Gyenizse L, Tremblay A. Atypic SUMOylation of Nor1/NR4A3 regulates neural cell viability and redox sensitivity. FASEB J 2021; 35:e21827. [PMID: 34383980 DOI: 10.1096/fj.202100395r] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 06/30/2021] [Accepted: 07/15/2021] [Indexed: 11/11/2022]
Abstract
Neuron-derived orphan receptor 1, NR4A3 (Nor1)/NR4A3 is an orphan nuclear receptor involved in the transcriptional control of developmental and neurological functions. Oxidative stress-induced conditions are primarily associated with neurological defects in humans, yet the impact on Nor1-mediated transcription of neuronal genes remains with unknown mechanism. Here, we demonstrate that Nor1 is a non-conventional target of SUMO2/3 conjugation at Lys-137 contained in an atypic ψKxSP motif referred to as the pSuM. Nor1 pSuM SUMOylation differs from the canonical process with the obligate phosphorylation of Ser-139 by Ras signaling to create the required negatively charged interface for SUMOylation. Additional phosphorylation at sites flanking the pSuM is also mediated by the coordinated action of protein kinase casein kinase 2 to function as a small ubiquitin-like modifier enhancer, regulating Nor1-mediated transcription and proteasomal degradation. Nor1 responsive genes involved in cell proliferation and metabolism, such as activating transcription factor 3, cyclin D1, CASP8 and FADD-like apoptosis regulator, and enolase 3 were upregulated in response to pSuM disruption in mouse HT-22 hippocampal neuronal cells and human neuroblastoma SH-SY5Y cells. We also identified critical antioxidant genes, such as catalase, superoxide dismutase 1, and microsomal glutathione S-transferase 2, as responsive targets of Nor1 under pSuM regulation. Nor1 SUMOylation impaired gene transcription through less effective Nor1 chromatin binding and reduced enrichment of histone H3K27ac marks to gene promoters. These effects resulted in decreased neuronal cell growth, increased apoptosis, and reduced survival to oxidative stress damage, underlying the role of pSuM-modified Nor1 in redox homeostasis. Our findings uncover a hierarchical post-translational mechanism that dictates Nor1 non-canonical SUMOylation, disrupting Nor1 transcriptional competence, and neuroprotective redox sensitivity.
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Affiliation(s)
- Jonathan Gagnon
- Research Center, CHU Sainte-Justine, Montréal, Québec, Canada.,Department of Biochemistry and Molecular Medicine, Faculty of Medicine, University of Montreal, Montréal, Québec, Canada
| | - Véronique Caron
- Research Center, CHU Sainte-Justine, Montréal, Québec, Canada
| | - Laurent Gyenizse
- Research Center, CHU Sainte-Justine, Montréal, Québec, Canada.,Department of Biochemistry and Molecular Medicine, Faculty of Medicine, University of Montreal, Montréal, Québec, Canada
| | - André Tremblay
- Research Center, CHU Sainte-Justine, Montréal, Québec, Canada.,Department of Biochemistry and Molecular Medicine, Faculty of Medicine, University of Montreal, Montréal, Québec, Canada.,Centre de Recherche en Reproduction et Fertilité, University of Montreal, Saint-Hyacinthe, Québec, Canada.,Department of Obstetrics & Gynecology, Faculty of Medicine, University of Montreal, Montréal, Québec, Canada
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38
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Lakk-Bogáth D, Török P, Csendes FV, Keszei S, Gantner B, Kaizer J. Disproportionation of H 2O 2 Mediated by Diiron-Peroxo Complexes as Catalase Mimics. Molecules 2021; 26:4501. [PMID: 34361652 DOI: 10.3390/molecules26154501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 07/23/2021] [Accepted: 07/24/2021] [Indexed: 11/17/2022] Open
Abstract
Heme iron and nonheme dimanganese catalases protect biological systems against oxidative damage caused by hydrogen peroxide. Rubrerythrins are ferritine-like nonheme diiron proteins, which are structurally and mechanistically distinct from the heme-type catalase but similar to a dimanganese KatB enzyme. In order to gain more insight into the mechanism of this curious enzyme reaction, non-heme structural and functional models were carried out by the use of mononuclear [FeII(L1-4)(solvent)3](ClO4)2 (1-4) (L1 = 1,3-bis(2-pyridyl-imino)isoindoline, L2 = 1,3-bis(4'-methyl-2-pyridyl-imino)isoindoline, L3 = 1,3-bis(4'-Chloro-2-pyridyl-imino)isoindoline, L4 = 1,3-bis(5'-chloro-2-pyridyl-imino)isoindoline) complexes as catalysts, where the possible reactive intermediates, diiron-perroxo [FeIII2(μ-O)(μ-1,2-O2)(L1-L4)2(Solv)2]2+ (5-8) complexes are known and well-characterized. All the complexes displayed catalase-like activity, which provided clear evidence for the formation of diiron-peroxo species during the catalytic cycle. We also found that the fine-tuning of iron redox states is a critical issue, both the formation rate and the reactivity of the diiron-peroxo species showed linear correlation with the FeIII/FeII redox potentials. Their stability and reactivity towards H2O2 was also investigated and based on kinetic and mechanistic studies a plausible mechanism, including a rate-determining hydrogen atom transfer between the H2O2 and diiron-peroxo species, was proposed. The present results provide one of the first examples of a nonheme diiron-peroxo complex, which shows a catalase-like reaction.
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Mains DR, Eallonardo SJ, Freitag NE. Identification of Listeria monocytogenes Genes Contributing to Oxidative Stress Resistance under Conditions Relevant to Host Infection. Infect Immun 2021; 89:e00700-20. [PMID: 33495274 DOI: 10.1128/IAI.00700-20] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 01/08/2021] [Indexed: 01/10/2023] Open
Abstract
The Gram-positive bacterium Listeria monocytogenes survives in environments ranging from the soil to the cytosol of infected host cells. Key to L. monocytogenes intracellular survival is the activation of PrfA, a transcriptional regulator that is required for the expression of multiple bacterial virulence factors. Mutations that constitutively activate prfA (prfA* mutations) result in high-level expression of multiple bacterial virulence factors as well as the physiological adaptation of L. monocytogenes for optimal replication within host cells. Here, we demonstrate that L. monocytogenes prfA* mutants exhibit significantly enhanced resistance to oxidative stress in comparison to that of wild-type strains. Transposon mutagenesis of L. monocytogenes prfA* strains resulted in the identification of three novel gene targets required for full oxidative stress resistance only in the context of PrfA activation. One gene, lmo0779, predicted to encode an uncharacterized protein, and two additional genes known as cbpA and ygbB, encoding a cyclic di-AMP binding protein and a 2-C-methyl-d-erythritol 2,4-cyclodiphosphate synthase, respectively, contribute to the enhanced oxidative stress resistance of prfA* strains while exhibiting no significant contribution in wild-type L. monocytogenes Transposon inactivation of cbpA and lmo0779 in a prfA* background led to reduced virulence in the liver of infected mice. These results indicate that L. monocytogenes calls upon specific bacterial factors for stress resistance in the context of PrfA activation and thus under conditions favorable for bacterial replication within infected mammalian cells.
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Wang Y, Lu R, Yao J, Li H. 1,5,7-Triazabicyclo[4.4.0]dec-5-ene Enhances Activity of Peroxide Intermediates in Phosphine-Free α-Hydroxylation of Ketones. Angew Chem Int Ed Engl 2021; 60:6631-6638. [PMID: 33289252 DOI: 10.1002/anie.202014478] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 11/28/2020] [Indexed: 12/29/2022]
Abstract
The critical role of double hydrogen bonds was addressed for the aerobic α-hydroxylation of ketones catalyzed by 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), in the absence of either a metal catalyst or phosphine reductant. Experimental and theoretical investigations were performed to study the mechanism. In addition to initiating the reaction by proton abstraction, a more important role of TBD was revealed, that is, to enhance the oxidizing ability of peroxide intermediates, allowing DMSO to be used rather than commonly used phosphine reductants. Further characterizations with nuclear Overhauser effect spectroscopy (NOESY) confirmed the presence of double hydrogen bonds between TBD and the ketone, and kinetic studies suggested the attack of dioxygen on the TBD-enol adduct to be the rate-determining step. This work should encourage the application of TBD as a catalyst for oxidations.
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Affiliation(s)
- Yongtao Wang
- Department of Chemistry and ZJU-NHU United R&D Center, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, P. R. China
| | - Rui Lu
- Department of Chemistry and ZJU-NHU United R&D Center, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, P. R. China
| | - Jia Yao
- Department of Chemistry and ZJU-NHU United R&D Center, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, P. R. China
| | - Haoran Li
- Department of Chemistry and ZJU-NHU United R&D Center, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, P. R. China.,State Key Laboratory of Chemical Engineering and College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, P. R. China
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41
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Abstract
2-Cys peroxiredoxins are abundant thiol proteins that react efficiently with a wide range of peroxides. Unlike other enzymes, their exceptionally high reactivity does not rely on cofactors. The mechanism of oxidation and reduction of peroxiredoxins places them in a good position to act as antioxidants as well as key players in redox signaling. Understanding of the intimate details of peroxiredoxin functioning is important for translational research.
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Affiliation(s)
- Alexander V Peskin
- Centre for Free Radical Research, University of Otago Christchurch, Christchurch, Otago, 8140, New Zealand.
| | - Christine C Winterbourn
- Centre for Free Radical Research, University of Otago Christchurch, Christchurch, Otago, 8140, New Zealand
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42
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Wen SJ, Zheng XM, Liu LF, Li NN, Mao HA, Huang L, Yuan QL. Effects of primary microglia and astrocytes on neural stem cells in in vitro and in vivo models of ischemic stroke. Neural Regen Res 2021; 16:1677-1685. [PMID: 33510055 PMCID: PMC8328755 DOI: 10.4103/1673-5374.306093] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Transplantation of neural stem cells (NSCs) can protect neurons in animal stroke models; however, their low rates of survival and neuronal differentiation limit their clinical application. Glial niches, an important location of neural stem cells, regulate survival, proliferation and differentiation of neural stem cells. However, the effects of activated glial cells on neural stem cells remain unclear. In the present study, we explored the effects of activated astrocytes and microglia on neural stem cells in vitro stroke models. We also investigated the effects of combined transplantation of neural stem cells and glial cells after stroke in rats. In a Transwell co-culture system, primary cultured astrocytes, microglia or mixed glial cells were exposed to glutamate or H2O2 and then seeded in the upper inserts, while primary neural stem cells were seeded in the lower uncoated wells and cultured for 7 days. Our results showed that microglia were conducive to neurosphere formation and had no effects on apoptosis within neurospheres, while astrocytes and mixed glial cells were conducive to neurosphere differentiation and reduced apoptosis within neurospheres, regardless of their pretreatment. In contrast, microglia and astrocytes induced neuronal differentiation of neural stem cells in differentiation medium, regardless of their pretreatment, with an exception of astrocytes pretreated with H2O2. Rat models of ischemic stroke were established by occlusion of the middle cerebral artery. Three days later, 5 × 105 neural stem cells with microglia or astrocytes were injected into the right lateral ventricle. Neural stem cell/astrocyte-treated rats displayed better improvement of neurological deficits than neural stem cell only-treated rats at 4 days after cell transplantation. Moreover, neural stem cell/microglia-, and neural stem cell/astrocyte-treated rats showed a significant decrease in ischemic volume compared with neural stem cell-treated rats. These findings indicate that microglia and astrocytes exert different effects on neural stem cells, and that co-transplantation of neural stem cells and astrocytes is more conducive to the recovery of neurological impairment in rats with ischemic stroke. The study was approved by the Animal Ethics Committee of Tongji University School of Medicine, China (approval No. 2010-TJAA08220401) in 2010.
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Affiliation(s)
- Sheng-Jun Wen
- Department of Neurology, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai, China
| | - Xi-Min Zheng
- Department of Neurology, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai, China
| | - Li-Fen Liu
- Department of Neurology, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai, China
| | - Na-Na Li
- Department of Neurology, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai, China
| | - Hai-An Mao
- Department of Neurology, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai, China
| | - Liang Huang
- Department of Neurology, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai, China
| | - Qiong-Lan Yuan
- Department of Neurology, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai, China
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43
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van der Westhuyzen CW, Haynes RK, Panayides JL, Wiid I, Parkinson CJ. Anti-Mycobacterial Peroxides: A New Class of Agents for Development Against Tuberculosis. Med Chem 2020; 16:392-402. [PMID: 31208310 DOI: 10.2174/1573406415666190430143535] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 04/15/2019] [Accepted: 04/15/2019] [Indexed: 01/01/2023]
Abstract
BACKGROUND With few exceptions, existing tuberculosis drugs were developed many years ago and resistance profiles have emerged. This has created a need for new drugs with discrete modes of action. There is evidence that tuberculosis (like other bacteria) is susceptible to oxidative pressure and this has yet to be properly utilised as a therapeutic approach in a manner similar to that which has proven highly successful in malaria therapy. OBJECTIVE To develop an alternative approach to the incorporation of bacterial siderophores that results in the creation of antitubercular peroxidic leads for subsequent development as novel agents against tuberculosis. METHODS Eight novel peroxides were prepared and the antitubercular activity (H37Rv) was compared to existing artemisinin derivatives in vitro. The potential for toxicity was evaluated against the L6 rat skeletal myoblast and HeLa cervical cancer lines in vitro. RESULTS The addition of a pyrimidinyl residue to an artemisinin or, preferably, a tetraoxane peroxidic structure results in antitubercular activity in vitro. The same effect is not observed in the absence of the pyrimidine or with other heteroaromatic substituents. CONCLUSION The incorporation of a pyrimidinyl residue adjacent to the peroxidic function in an organic peroxide results in anti-tubercular activity in an otherwise inactive peroxidic compound. This will be a useful approach for creating oxidative drugs to target tuberculosis.
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Affiliation(s)
| | - Richard K Haynes
- Centre for Excellence for Pharmaceutical Sciences, North-West University, Potchefstroom 2531, South Africa
| | | | - Ian Wiid
- SAMRC Centre for TB Research, DST-NRF Centre for Excellence for Biomedical Tuberculosis Research, Stellenbosch University, Tygerberg, South Africa
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44
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Lazado CC, Voldvik V, Breiland MW, Osório J, Hansen MHS, Krasnov A. Oxidative Chemical Stressors Alter the Physiological State of the Nasal Olfactory Mucosa of Atlantic Salmon. Antioxidants (Basel) 2020; 9:E1144. [PMID: 33218110 DOI: 10.3390/antiox9111144] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Revised: 11/15/2020] [Accepted: 11/17/2020] [Indexed: 12/17/2022] Open
Abstract
The olfactory organs of fish have vital functions for chemosensory and defence. Though there have been some ground-breaking discoveries of their involvement in immunity against pathogens in recent years, little is known about how they respond to non-infectious agents, such as exogenous oxidants, which fish encounter regularly. To this end, we employed Atlantic salmon (Salmo salar) as a model to study the molecular responses at the nasal olfactory mucosa of a teleost fish when challenged with oxidants. Microarray analysis was employed to unravel the transcriptional changes at the nasal olfactory mucosa following two types of in vivo exposure to peracetic acid (PAA), a highly potent oxidative agent commonly used in aquaculture: Trial 1: periodic and low dose (1 ppm, every 3 days over 45 days) to simulate a routine disinfection; and Trial 2: less frequent and high dose (10 ppm for 30 min, every 15 days, 3 times) to mimic a bath treatment. Furthermore, leukocytes from the olfactory organ were isolated and exposed to PAA, as well as to hydrogen peroxide (H2O2) and acetic acid (AA)—the two other components of PAA trade products—to perform targeted cellular and molecular response profiling. In the first trial, microarrays identified 32 differentially expressed genes (DEG) after a 45-day oxidant exposure. Erythrocyte-specific genes were overly represented and substantially upregulated following exogenous oxidant exposure. In Trial 2, in which a higher dose was administered, 62 DEGs were identified, over 80% of which were significantly upregulated after exposure. Genes involved in immune response, redox balance and stress, maintenance of cellular integrity and extracellular matrix were markedly affected by the oxidant. All chemical stimuli (i.e., PAA, H2O2, AA) significantly affected the proliferation of nasal leukocytes, with indications of recovery observed in PAA- and H2O2-exposed cells. The migration of nasal leukocytes was promoted by H2O2, but not much by PAA and AA. The three chemical oxidative stressors triggered oxidative stress in nasal leukocytes as indicated by an increase in the intracellular reactive oxygen species level. This resulted in the mobilisation of antioxidant defences in the nasal leukocytes as shown by the upregulation of crucial genes for this response network. Though qPCR revealed changes in the expression of selected cytokines and heat shock protein genes following in vitro challenge, the responses were stochastic. The results from the study advance our understanding of the role that the nasal olfactory mucosa plays in host defence, particularly towards oxidative chemical stressors.
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45
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Dicko M, Ferrari R, Tangthirasunun N, Gautier V, Lalanne C, Lamari F, Silar P. Lignin Degradation and Its Use in Signaling Development by the Coprophilous Ascomycete Podospora anserina. J Fungi (Basel) 2020; 6:E278. [PMID: 33187140 PMCID: PMC7712204 DOI: 10.3390/jof6040278] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 11/06/2020] [Accepted: 11/10/2020] [Indexed: 01/06/2023] Open
Abstract
The filamentous fungus Podospora anserina is a good model to study the breakdown of lignocellulose, owing to its ease of culture and genetical analysis. Here, we show that the fungus is able to use a wide range of lignocellulosic materials as food sources. Using color assays, spectroscopy and pyrolysis-gas chromatography mass spectrometry, we confirm that this ascomycete is able to degrade lignin, primarily by hydrolyzing β-O-4 linkages, which facilitates its nutrient uptake. We show that the limited weight loss that is promoted when attacking Miscanthus giganteus is due to a developmental blockage rather than an inefficiency of its enzymes. Finally, we show that lignin, and, more generally, phenolics, including degradation products of lignin, greatly stimulate the growth and fertility of the fungus in liquid cultures. Analyses of the CATΔΔΔΔΔ mutant lacking all its catalases, pro-oxidants and antioxidants indicate that improved growth and fertility of the fungus is likely caused by augmented reactive oxygen species levels triggered by the presence of phenolics.
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Affiliation(s)
- Moussa Dicko
- Université Sorbonne Paris Nord, CNRS LSPM UPR 3407, 93430 Villetaneuse, France; (M.D.); (F.L.)
| | - Roselyne Ferrari
- Université de Paris, Laboratoire Interdisciplinaire des Energies de Demain (LIED), F-75006 Paris, France; (R.F.); (N.T.); (V.G.); (C.L.)
| | - Narumon Tangthirasunun
- Université de Paris, Laboratoire Interdisciplinaire des Energies de Demain (LIED), F-75006 Paris, France; (R.F.); (N.T.); (V.G.); (C.L.)
| | - Valérie Gautier
- Université de Paris, Laboratoire Interdisciplinaire des Energies de Demain (LIED), F-75006 Paris, France; (R.F.); (N.T.); (V.G.); (C.L.)
| | - Christophe Lalanne
- Université de Paris, Laboratoire Interdisciplinaire des Energies de Demain (LIED), F-75006 Paris, France; (R.F.); (N.T.); (V.G.); (C.L.)
| | - Farida Lamari
- Université Sorbonne Paris Nord, CNRS LSPM UPR 3407, 93430 Villetaneuse, France; (M.D.); (F.L.)
| | - Philippe Silar
- Université de Paris, Laboratoire Interdisciplinaire des Energies de Demain (LIED), F-75006 Paris, France; (R.F.); (N.T.); (V.G.); (C.L.)
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Abstract
Tyrosyl radical generation is one of the major factors for hemin/peroxide-induced oxidative stress. A method for trapping tyrosyl radical directly was developed using N-methyl luminol derivative, a tyrosine labeling reagent. N-Methyl luminol derivative selectively forms a covalent bond with a tyrosine residue under the single-electron oxidation condition. This reaction labels oxidative stress hotspots not only at the protein level but also at the level of tyrosine residues undergoing oxidation. Human serum albumin complexed with hemin was labeled at Tyr138, the tyrosine residue closest to the hemin binding site and most strongly subjected to oxidative stress caused by hemin/H2O2. Oxidatively damaged proteins were visualized in protein mixtures.
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Affiliation(s)
- Shinichi Sato
- Frontier Research Institute for Interdisciplinary Sciences, Tohoku University.,Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology
| | - Hiroyuki Nakamura
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology
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47
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Cesinger MR, Thomason MK, Edrozo MB, Halsey CR, Reniere ML. Listeria monocytogenes SpxA1 is a global regulator required to activate genes encoding catalase and heme biosynthesis enzymes for aerobic growth. Mol Microbiol 2020; 114:230-243. [PMID: 32255216 PMCID: PMC7496741 DOI: 10.1111/mmi.14508] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 03/23/2020] [Accepted: 03/25/2020] [Indexed: 12/24/2022]
Abstract
An imbalance of cellular oxidants and reductants causes redox stress, which must be rapidly detected to restore homeostasis. In bacteria, the Firmicutes encode conserved Spx-family transcriptional regulators that modulate transcription in response to redox stress. SpxA1 is an Spx-family orthologue in the intracellular pathogen Listeria monocytogenes that is essential for aerobic growth and pathogenesis. Here, we investigated the role of SpxA1 in growth and virulence by identifying genes regulated by SpxA1 in broth and during macrophage infection. We found SpxA1-activated genes encoding heme biosynthesis enzymes and catalase (kat) were required for L. monocytogenes aerobic growth in rich medium. An Spx-recognition motif previously defined in Bacillus subtilis was identified in the promoters of SpxA1-activated genes and proved necessary for the proper activation of two genes, indicating this regulation by SpxA1 is likely direct. Together, these findings elucidated the mechanism of spxA1 essentiality in vitro and demonstrated that SpxA1 is required for basal expression of scavenging enzymes to combat redox stress generated in the presence of oxygen.
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Affiliation(s)
- Monica R. Cesinger
- Department of MicrobiologySchool of MedicineUniversity of WashingtonSeattleWAUSA
| | - Maureen K. Thomason
- Department of MicrobiologySchool of MedicineUniversity of WashingtonSeattleWAUSA
| | - Mauna B. Edrozo
- Department of MicrobiologySchool of MedicineUniversity of WashingtonSeattleWAUSA
| | - Cortney R. Halsey
- Department of MicrobiologySchool of MedicineUniversity of WashingtonSeattleWAUSA
| | - Michelle L. Reniere
- Department of MicrobiologySchool of MedicineUniversity of WashingtonSeattleWAUSA
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Xu G, Crotti M, Saravanan T, Kataja KM, Poelarends GJ. Enantiocomplementary Epoxidation Reactions Catalyzed by an Engineered Cofactor-Independent Non-natural Peroxygenase. Angew Chem Int Ed Engl 2020; 59:10374-10378. [PMID: 32160395 PMCID: PMC7317984 DOI: 10.1002/anie.202001373] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 03/06/2020] [Indexed: 11/29/2022]
Abstract
Peroxygenases are heme-dependent enzymes that use peroxide-borne oxygen to catalyze a wide range of oxyfunctionalization reactions. Herein, we report the engineering of an unusual cofactor-independent peroxygenase based on a promiscuous tautomerase that accepts different hydroperoxides (t-BuOOH and H2 O2 ) to accomplish enantiocomplementary epoxidations of various α,β-unsaturated aldehydes (citral and substituted cinnamaldehydes), providing access to both enantiomers of the corresponding α,β-epoxy-aldehydes. High conversions (up to 98 %), high enantioselectivity (up to 98 % ee), and good product yields (50-80 %) were achieved. The reactions likely proceed via a reactive enzyme-bound iminium ion intermediate, allowing tweaking of the enzyme's activity and selectivity by protein engineering. Our results underscore the potential of catalytic promiscuity for the engineering of new cofactor-independent oxidative enzymes.
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Affiliation(s)
- Guangcai Xu
- Department of Chemical and Pharmaceutical BiologyGroningen Research Institute of PharmacyUniversity of GroningenAntonius Deusinglaan 19713AVGroningenThe Netherlands
| | - Michele Crotti
- Department of Chemical and Pharmaceutical BiologyGroningen Research Institute of PharmacyUniversity of GroningenAntonius Deusinglaan 19713AVGroningenThe Netherlands
| | - Thangavelu Saravanan
- Department of Chemical and Pharmaceutical BiologyGroningen Research Institute of PharmacyUniversity of GroningenAntonius Deusinglaan 19713AVGroningenThe Netherlands
- Present address: School of ChemistryUniversity of HyderabadP.O. Central University, GachibowliHyderabad500046India
| | - Kim M. Kataja
- Department of Chemical and Pharmaceutical BiologyGroningen Research Institute of PharmacyUniversity of GroningenAntonius Deusinglaan 19713AVGroningenThe Netherlands
| | - Gerrit J. Poelarends
- Department of Chemical and Pharmaceutical BiologyGroningen Research Institute of PharmacyUniversity of GroningenAntonius Deusinglaan 19713AVGroningenThe Netherlands
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49
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Hsieh TE, Lin SJ, Chen LC, Chen CC, Lai PL, Huang CC. Optimizing an Injectable Composite Oxygen-Generating System for Relieving Tissue Hypoxia. Front Bioeng Biotechnol 2020; 8:511. [PMID: 32528945 PMCID: PMC7264163 DOI: 10.3389/fbioe.2020.00511] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Accepted: 04/30/2020] [Indexed: 12/11/2022] Open
Abstract
Oxygen deficiency resulting from bone fracture-induced vascular disruption leads to massive cell death and delayed osteoblast differentiation, ultimately impairing new bone formation and fracture healing. Enhancing local tissue oxygenation can help promote bone regeneration. In this work, an injectable composite oxygen-generating system consisting of calcium peroxide (CaO2)/manganese dioxide (MnO2)-encapsulated poly lactic-co-glycolic acid (PLGA) microparticles (CaO2 + MnO2@PLGA MPs) is proposed for the local delivery of oxygen. By utilizing a series of methodologies, the impacts of each component used for MP fabrication on the oxygen release behavior and cytotoxicity of the CaO2 + MnO2@ PLGA MPs are thoroughly investigated. Our analytical data obtained from in vitro studies indicate that the optimized CaO2 + MnO2@PLGA MPs developed in this study can effectively relieve the hypoxia of preosteoblast MC3T3-E1 cells that are grown under low oxygen tension and promote their osteogenic differentiation, thus holding great promise in enhancing fractural healing by increasing tissue oxygenation.
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Affiliation(s)
- Tai-En Hsieh
- Institute of Biomedical Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - Sheng-Ju Lin
- Institute of Biomedical Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - Li-Chi Chen
- Institute of Biomedical Engineering, National Tsing Hua University, Hsinchu, Taiwan.,Department of Life Science, National Tsing Hua University, Hsinchu, Taiwan
| | - Chun-Chieh Chen
- Department of Orthopaedic Surgery, Linkou Chang Gung Memorial Hospital, Taoyuan City, Taiwan.,Bone and Joint Research Center, Linkou Chang Gung Memorial Hospital, Taoyuan City, Taiwan
| | - Po-Liang Lai
- Department of Orthopaedic Surgery, Linkou Chang Gung Memorial Hospital, Taoyuan City, Taiwan.,Bone and Joint Research Center, Linkou Chang Gung Memorial Hospital, Taoyuan City, Taiwan
| | - Chieh-Cheng Huang
- Institute of Biomedical Engineering, National Tsing Hua University, Hsinchu, Taiwan
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50
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Yaremenko IA, Syromyatnikov MY, Radulov PS, Belyakova YY, Fomenkov DI, Popov VN, Terent’ev AO. Cyclic Synthetic Peroxides Inhibit Growth of Entomopathogenic Fungus Ascosphaera apis without Toxic Effect on Bumblebees. Molecules 2020; 25:molecules25081954. [PMID: 32331472 PMCID: PMC7221740 DOI: 10.3390/molecules25081954] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 04/19/2020] [Accepted: 04/20/2020] [Indexed: 12/17/2022] Open
Abstract
In recent years, the number of pollinators in the world has significantly decreased. A possible reason for this is the toxic effects of agrochemicals reducing the immunity of insects that leads to their increased susceptibility to pathogens. Ascosphaera apis is a dangerous entomopathogenic fungus, afflicting both honeybees and bumblebees. We investigated fungicide activity of cyclic synthetic peroxides against A. apis isolated from Bombus terrestris L. The peroxides exhibited high mycelium growth inhibition of A. apis up to 94–100% at concentration 30 mg/L. EC50 values were determined for the most active peroxides. Two peroxides showed higher antifungal activity against A. apis than the commercial fungicide Triadimefon. The studied peroxides did not reduce the ability of bumblebees to fly and did not lead to the death of bumblebees. A new field of application for peroxides was disclosed.
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Affiliation(s)
- Ivan A. Yaremenko
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 119991, Russia; (I.A.Y.); (P.S.R.); (Y.Y.B.); (D.I.F.)
- All-Russian Research Institute for Phytopathology, B. Vyazyomy, Moscow Region 143050, Russia
| | - Mikhail Y. Syromyatnikov
- Department of Genetics, Cytology and Bioengineering, Voronezh State University, Voronezh 394018, Russia; (M.Y.S.); (V.N.P.)
| | - Peter S. Radulov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 119991, Russia; (I.A.Y.); (P.S.R.); (Y.Y.B.); (D.I.F.)
- All-Russian Research Institute for Phytopathology, B. Vyazyomy, Moscow Region 143050, Russia
| | - Yulia Yu. Belyakova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 119991, Russia; (I.A.Y.); (P.S.R.); (Y.Y.B.); (D.I.F.)
- All-Russian Research Institute for Phytopathology, B. Vyazyomy, Moscow Region 143050, Russia
| | - Dmitriy I. Fomenkov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 119991, Russia; (I.A.Y.); (P.S.R.); (Y.Y.B.); (D.I.F.)
| | - Vasily N. Popov
- Department of Genetics, Cytology and Bioengineering, Voronezh State University, Voronezh 394018, Russia; (M.Y.S.); (V.N.P.)
- Voronezh State University of Engineering Technologies, Voronezh 394036, Russia
| | - Alexander O. Terent’ev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow 119991, Russia; (I.A.Y.); (P.S.R.); (Y.Y.B.); (D.I.F.)
- All-Russian Research Institute for Phytopathology, B. Vyazyomy, Moscow Region 143050, Russia
- Correspondence: ; Tel.: +7-916-385-4080
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