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Yuan Y, Yang M, Kloß SD, Attfield JP. A New Family of High Oxidation State Antiperovskite Nitrides: La3MN5 (M = Cr, Mn and Mo). Angew Chem Int Ed Engl 2024:e202405498. [PMID: 38651652 DOI: 10.1002/anie.202405498] [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: 03/20/2024] [Revised: 04/22/2024] [Accepted: 04/23/2024] [Indexed: 04/25/2024]
Abstract
Three new nitrides La3MN5 (M = Cr, Mn, and Mo) have been synthesized using a high pressure azide route. These are the first examples of ternary Cs3CoCl5-type nitrides, and show that this (MN4)NLa3 antiperovskite structure type may be used to stabilise high oxidation-state transition metals in tetrahedral molecular [MN4]n- nitridometallate anions. Magnetic measurements confirm that Cr and Mo are in the M6+ state, but the M = Mn phase has an anomalously small paramagnetic moment and large cell volume. Neutron powder diffraction data are fitted using an anion-excess La3MnN5.30 model (space group I4/mcm, a = 6.81587(9) Å and c = 11.22664(18) Å at 200 K) in which Mn is close to the +7 state. Excess-anion incorporation into Cs3CoCl5-type materials has not been previously reported, and this or other substitution mechanisms may enable many other high oxidation state transition metal nitrides to be prepared.
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Affiliation(s)
- Yao Yuan
- University of Edinburgh, chemistry, UNITED KINGDOM
| | - Minghui Yang
- Dalian University of Technology, chemistry, CHINA
| | - Simon D Kloß
- Ludwig Maximillians University Munich, chemistry, GERMANY
| | - John Paul Attfield
- University of Edinburgh, Centre for Science at Extreme Conditions, Mayfield Road, EH9 3JZ, Edinburgh, UNITED KINGDOM
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van der Heijden LT, van den Hondel KE, Olyslager EJH, de Jong LAA, Reijnders UJL, Franssen EJF. Internet-Purchased Sodium Azide Used in a Fatal Suicide Attempt: A Case Report and Review of the Literature. Toxics 2023; 11:608. [PMID: 37505573 PMCID: PMC10385699 DOI: 10.3390/toxics11070608] [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] [Received: 06/13/2023] [Revised: 07/06/2023] [Accepted: 07/11/2023] [Indexed: 07/29/2023]
Abstract
There has been a significant increase in sodium azide intoxications since the 1980s. Intoxications caused by sodium azide are becoming increasingly prevalent in the Netherlands as a result of its promotion for the purpose of self-euthanasia. The mechanism of toxicity is not completely understood but is dose-dependent. The presented case describes a suicide by sodium azide of a young woman (26 years old) with a history of depression and suicide attempts. The decedent was found in the presence of prescription medicine, including temazepam, domperidone in combination with omeprazole, and the chemical preservative sodium azide. Quantitative toxicology screening of whole blood revealed the presence of 70 µg/L temazepam (toxic range > 1000 µg/L) and 28 mg/L sodium azide (fatal range: 2.6-262 mg/L). Whole blood qualitative analysis revealed the presence of temazepam, temazepam-glucuronide, olanzapine, n-desmethylolanzapine, and acetaminophen. In circles promoting sodium azide, it is recommended to use sodium azide in combination with medications targeting sodium azide's negative effects, such as analgesics, antiemetics, and anti-anxiety drugs. The medicines recovered at the body's location, as well as the results of the toxicology screens, were consistent with the recommendations of self-euthanasia using sodium azide.
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Affiliation(s)
- Lisa T van der Heijden
- Department of Pharmacy & Pharmacology, Antoni van Leeuwenhoek/The Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands
- Division of Pharmacology, Antoni van Leeuwenhoek/The Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands
| | | | - Erik J H Olyslager
- Department of Clinical Pharmacy, Expert Center Gelre-iLab, Gelre Hospitals, 1066 CX Apeldoorn/Zutphen, The Netherlands
| | - Lutea A A de Jong
- Department of Clinical Pharmacy, Expert Center Gelre-iLab, Gelre Hospitals, 1066 CX Apeldoorn/Zutphen, The Netherlands
| | - Udo J L Reijnders
- Department of Forensic Medicine, GGD Amsterdam, 1066 CX Amsterdam, The Netherlands
| | - Eric J F Franssen
- Department of Clinical Pharmacy, OLVG Hospital, 1066 CX Amsterdam, The Netherlands
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3
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Chiew K, Wright NE, Cairns R. Clinical features of COVID-19 rapid antigen test exposures reported by an Australian poisons information centre: a prospective study. Clin Toxicol (Phila) 2023:1-3. [PMID: 37293746 DOI: 10.1080/15563650.2023.2217337] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
INTRODUCTION Coronavirus disease COVID-19 rapid antigen tests are a useful tool in detecting infection, and their use has increased in many countries since they became commercially available in late 2021. Some rapid antigen tests contain sodium azide, which can be toxic in small doses. This study aimed to describe the clinical characteristics of exposures to COVID-19 rapid antigen tests. METHODS This is a prospective study conducted by the New South Wales Poisons Information Centre. From 22 January 2022 to 31 August 2022, rapid antigen test exposures were followed up to obtain outcome information. Data collected included: brand/ingredients, exposure route, demographics, symptoms, and disposition. RESULTS We recorded 218 exposures in the seven-month study period. Complete follow-up information was available in 75% (n = 164). There were 53 exposures to sodium azide-containing products (35 with follow-up data) and 165 to non-sodium azide-containing products and unknown ingredient exposures (129 with follow-up data). Overall, unintentional exposures predominated (n = 182), and 151 were ingestions. The vast majority (>90%) did not develop symptoms, and all symptoms that developed were mild. Most cases (95%, n = 208) did not require referral to a healthcare facility. CONCLUSIONS In this prospective series, few patients developed symptoms, regardless of the sodium azide content, likely due to low concentration and low volume within the test kits. However, ongoing toxicovigilance is warranted.
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Affiliation(s)
- Katherine Chiew
- New South Wales Poisons Information Centre, The Children's Hospital at Westmead, Westmead, Australia
| | - Nicole E Wright
- New South Wales Poisons Information Centre, The Children's Hospital at Westmead, Westmead, Australia
| | - Rose Cairns
- School of Pharmacy, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
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Muzalevskiy VM, Sizova ZA, Nechaev MS, Nenajdenko VG. Acid-Switchable Synthesis of Trifluoromethylated Triazoles and Isoxazoles via Reaction of CF 3-Ynones with NaN 3: DFT Study of the Reaction Mechanism. Int J Mol Sci 2022; 23:ijms232314522. [PMID: 36498860 PMCID: PMC9735682 DOI: 10.3390/ijms232314522] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 11/10/2022] [Accepted: 11/20/2022] [Indexed: 11/23/2022] Open
Abstract
A detailed study of the reaction of CF3-ynones with NaN3 was performed. It was found that the reaction permits the selective synthesis of either 4-trifluoroacetyltriazoles or 5-CF3-isoxazoles. The chemoselectivity of the reaction was switchable via acid catalysis. The reaction of CF3-ynones with NaN3 in EtOH produced high yields of 4-trifluoroacetyltriazoles. In contrast, the formation of 5-CF3-isoxazoles was observed under catalysis by acids. This acid-switchable procedure can be performed at sub-gram scale. The possible reaction mechanism was supported by DFT calculations. The synthetic utility of the prepared 4-trifluoroacetyltriazoles was demonstrated.
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Affiliation(s)
| | - Zoia A. Sizova
- Department of Chemistry, Lomonosov Moscow State University, 119899 Moscow, Russia
| | - Mikhail S. Nechaev
- Department of Chemistry, Lomonosov Moscow State University, 119899 Moscow, Russia
- A. V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 119991 Moscow, Russia
| | - Valentine G. Nenajdenko
- Department of Chemistry, Lomonosov Moscow State University, 119899 Moscow, Russia
- Correspondence:
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Ghareeb YE, Soliman SS, Ismail TA, Hassan MA, Abdelkader MA, Abdel Latef AAH, Al-Khayri JM, ALshamrani SM, Safhi FA, Awad MF, El-Moneim DA, Hassanin AA. Improvement of German Chamomile ( Matricaria recutita L.) for Mechanical Harvesting, High Flower Yield and Essential Oil Content Using Physical and Chemical Mutagenesis. Plants (Basel) 2022; 11:2940. [PMID: 36365394 PMCID: PMC9653700 DOI: 10.3390/plants11212940] [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] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 10/24/2022] [Accepted: 10/27/2022] [Indexed: 06/16/2023]
Abstract
Chamomile (Matricariarecutita L.) is one of the most important medicinal plants with various applications. The flowers and flower heads are the main organs inthe production of essential oil. The essential improvement goals of chamomile are considered to be high flower yield and oil content, as well asthe suitability for mechanical harvesting. The present study aimed to improve the flower yield, oil content and mechanical harvestability of German chamomile via chemical and physical mutagens. Three German chamomile populations (Fayum, Benysuif and Menia) were irradiated with 100, 200, 300 and 400 Gray doses of gamma rays, as well as chemically mutagenized using 0.001, 0.002 and 0.003 mol/mL of sodium azide for 4 h. The two mutagens produced a wide range of changes in the flowers' shape and size. At M3 generation, 18 mutants (11 from gamma irradiation and 7 from sodium azide mutagenization) were selected and morphologically characterized. Five out of eighteen mutants were selected for morphological and chemical characterization for oil content, oil composition and oil quality in M4 generation. Two promising mutants, F/LF5-2-1 and B/HNOF 8-4-2, were selected based on their performance in most studied traits during three generations, as well as the high percentage of cut efficiency and a homogenous flower horizon, which qualify them as suitable candidates for mechanical harvesting. The two mutants are late flowering elite mutants; the F/LF5-2-1 mutant possessed the highest oil content (1.77%) and number of flowers/plant (1595), while the second promising B/HNOF 8-4-2 mutant hada high oil content (1.29%) and chamazulene percentage (13.98%) compared to control plants. These results suggest that the B/HNOF 8-4-2 and F/LF5-2-1 mutants could be integrated as potential parents into breeding programs for a high number of flowers, high oil content, oil composition and oil color traits for German chamomile improvement.
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Affiliation(s)
- Yasser E. Ghareeb
- Genetics Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt
| | - Said S. Soliman
- Genetics Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt
| | - Tarek A. Ismail
- Genetics Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt
| | - Mohammed A. Hassan
- Genetics Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt
| | - Mohammed A. Abdelkader
- Horticulture Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt
| | | | - Jameel M. Al-Khayri
- Department of Agricultural Biotechnology, College of Agriculture and Food Sciences, King Faisal University, Al-Ahsa 31982, Saudi Arabia
| | - Salha M. ALshamrani
- Department of Biology, College of Science, University of Jeddah, Jeddah 21959, Saudi Arabia
| | - Fatmah A. Safhi
- Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, Riyadh 11671, Saudi Arabia
| | - Mohamed F. Awad
- Department of Biology, College of Science, Taif University, Taif 21944, Saudi Arabia
| | - Diaa Abd El-Moneim
- Department of Plant Production, (Genetic Branch), Faculty of Environmental and Agricultural Sciences, Arish University, El-Arish 45511, Egypt
| | - Abdallah A. Hassanin
- Genetics Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt
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Mistry V, Tiwari P, Patel P, Vishwakarma GS, Lee GJ, Sharma A. Ethyl Methane Sulfonate and Sodium Azide-Mediated Chemical and X-ray-Mediated Physical Mutagenesis Positively Regulate Peroxidase 1 Gene Activity and Biosynthesis of Antineoplastic Vinblastine in Catharanthus roseus. Plants (Basel) 2022; 11:2885. [PMID: 36365340 PMCID: PMC9656251 DOI: 10.3390/plants11212885] [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] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 10/18/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
Catharanthus roseus synthesizes bioactive therapeutic metabolites, known as monoterpenoid indole alkaloids (MIAs), including antineoplastic vinblastine and vincristine, which have high global demand, and antihypertensive ajmalicine, a serpentine. However, the in planta biosynthesis and accumulation of these phytopharmaceuticals are very low, attributed to their high cytotoxicity in the plant. Considering the low in planta concentration and over-harvesting of plant resources, biotechnological interventions have been undertaken to enhance the production of MIAs in plant systems. The present study was carried out to mutation through chemical and physical mutagenesis with sodium azide, ethyl methane sulfonate and X-rays, respectively, on C. roseus to determine their possible effects on the transcriptional modulation of MIA biosynthetic pathways in planta. The chemical mutagenesis resulted in delayed seed pod development in mutated C. roseus plants, with distinct leaf morphology and flower color. However, X-ray mutagenesis resulted in pollen-less sterile flowers. An HPLC analysis confirmed the higher catharanthine, vindoline and vinblastine content in sodium azide and X-ray mutants, and was further supported by higher PRX1 transcript levels estimated through real-time PCR analysis. The transcription factors WRKY1 and ORCA2 were found negatively regulated along with major MIA pathway genes in chemical mutants and their M1 generation, but showed positive regulation in X-ray M0 mutants. The induced mutagenesis of C. roseus provides a prospective strategy to modulate plant transcriptomes and enhance the biosynthesis of pharmaceutically important antineoplastic vinblastine in the plant.
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Affiliation(s)
- Vyoma Mistry
- C. G. Bhakta Institute of Biotechnology, Maliba Campus, Uka Tarsadia University, Surat 394350, India
| | - Pragya Tiwari
- Department of Biotechnology, Yeungnam University, Gyeongsan 38541, Korea
| | - Paresh Patel
- Tarsadia Institute of Chemical Science, Uka Tarsadia University, Bardoli 394350, India
| | - Gajendra Singh Vishwakarma
- Department of Biotechnology and Bioengineering, Institute of Advanced Research, Koba Institutional Area, Gandhinagar 392426, India
| | - Geung-Joo Lee
- Department of Horticulture, Chungnam National University, Daejeon 34134, Korea
- Department of Smart Agriculture Systems, Chungnam National University, Daejeon 34134, Korea
| | - Abhishek Sharma
- C. G. Bhakta Institute of Biotechnology, Maliba Campus, Uka Tarsadia University, Surat 394350, India
- Department of Biotechnology and Bioengineering, Institute of Advanced Research, Koba Institutional Area, Gandhinagar 392426, India
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Eiermann N, Stoecklin G, Jovanovic B. Mitochondrial Inhibition by Sodium Azide Induces Assembly of eIF2α Phosphorylation-Independent Stress Granules in Mammalian Cells. Int J Mol Sci 2022; 23:5600. [PMID: 35628412 DOI: 10.3390/ijms23105600] [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: 03/18/2022] [Revised: 05/12/2022] [Accepted: 05/12/2022] [Indexed: 11/28/2022] Open
Abstract
Mitochondrial stress is involved in many pathological conditions and triggers the integrated stress response (ISR). The ISR is initiated by phosphorylation of the eukaryotic translation initiation factor (eIF) 2α and results in global inhibition of protein synthesis, while the production of specific proteins important for the stress response and recovery is favored. The stalled translation preinitiation complexes phase-separate together with local RNA binding proteins into cytoplasmic stress granules (SG), which are important for regulation of cell signaling and survival under stress conditions. Here we found that mitochondrial inhibition by sodium azide (NaN3) in mammalian cells leads to translational inhibition and formation of SGs, as previously shown in yeast. Although mammalian NaN3-induced SGs are very small, they still contain the canonical SG proteins Caprin 1, eIF4A, eIF4E, eIF4G and eIF3B. Similar to FCCP and oligomycine, other mitochodrial stressors that cause SG formation, NaN3-induced SGs are formed by an eIF2α phosphorylation-independent mechanisms. Finally, we discovered that as shown for arsenite (ASN), but unlike FCCP or heatshock stress, Thioredoxin 1 (Trx1) is required for formation of NaN3-induced SGs.
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Lin CX, Hsu HH, Chang YH, Chen SH, Lin SB, Lou SN, Chen HH. Expanding the Applicability of an Innovative Laccase TTI in Intelligent Packaging by Adding an Enzyme Inhibitor to Change Its Coloration Kinetics. Polymers (Basel) 2021; 13:polym13213646. [PMID: 34771203 PMCID: PMC8587941 DOI: 10.3390/polym13213646] [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: 09/17/2021] [Revised: 10/18/2021] [Accepted: 10/18/2021] [Indexed: 12/02/2022] Open
Abstract
Enzymatic time–temperature indicators (TTIs) usually suffer from instability and inefficiency in practical use as food quality indicator during storage. The aim of this study was to address the aforementioned problem by immobilizing laccase on electrospun chitosan fibers to increase the stability and minimize the usage of laccase. The addition of NaN3, as and enzyme inhibitor, was intended to extend this laccase TTI coloration rate and activation energy (Ea) range, so as to expand the application range of TTIs for evaluating changes in the quality of foods during storage. A two-component time–temperature indicator was prepared by immobilizing laccase on electrospun chitosan fibers as a TTI film, and by using guaiacol solution as a coloration substrate. The color difference of the innovative laccase TTI was discovered to be <3, and visually indistinguishable when OD500 reached 3.2; the response reaction time was regarded as the TTI’s coloration endpoint. Enzyme immobilization and the addition of NaN3 increased coloration Km and reduced coloration Vmax. The coloration Vmax decreased to 64% when 0.1 mM NaN3 was added to the TTI, which exhibited noncompetitive inhibition and a slower coloration rate. Coloration hysteresis appeared in the TTI with NaN3, particularly at low temperatures. For TTI coloration, the Ea increased to 29.92–66.39 kJ/mol when 15–25 μg/cm2 of laccase was immobilized, and the endpoint increased to 11.0–199.5 h when 0–0.10 mM NaN3 was added. These modifications expanded the applicability of laccase TTIs in intelligent food packaging.
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Affiliation(s)
- Cheng-Xuan Lin
- Department of Food Science, National Ilan University, Shennong Road, Yilan City 26047, Taiwan; (C.-X.L.); (H.-H.H.); (Y.-H.C.); (S.-B.L.); (S.-N.L.)
| | - Hao-Hsin Hsu
- Department of Food Science, National Ilan University, Shennong Road, Yilan City 26047, Taiwan; (C.-X.L.); (H.-H.H.); (Y.-H.C.); (S.-B.L.); (S.-N.L.)
| | - Yu-Hsuan Chang
- Department of Food Science, National Ilan University, Shennong Road, Yilan City 26047, Taiwan; (C.-X.L.); (H.-H.H.); (Y.-H.C.); (S.-B.L.); (S.-N.L.)
| | - Shih-Hsin Chen
- Institute of Food Science and Technology, National Taiwan University, Roosevelt Road, Taipei City 10617, Taiwan;
| | - Shih-Bin Lin
- Department of Food Science, National Ilan University, Shennong Road, Yilan City 26047, Taiwan; (C.-X.L.); (H.-H.H.); (Y.-H.C.); (S.-B.L.); (S.-N.L.)
| | - Shyi-Neng Lou
- Department of Food Science, National Ilan University, Shennong Road, Yilan City 26047, Taiwan; (C.-X.L.); (H.-H.H.); (Y.-H.C.); (S.-B.L.); (S.-N.L.)
| | - Hui-Huang Chen
- Department of Food Science, National Ilan University, Shennong Road, Yilan City 26047, Taiwan; (C.-X.L.); (H.-H.H.); (Y.-H.C.); (S.-B.L.); (S.-N.L.)
- Correspondence: ; Tel.: +886-3-931-7764
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Desai S, Jadhav A, Ramteke A, Dhole V, Bapat V, Gaikwad N. Genetic improvement of two Indian non-basmati aromatic rice landraces through physical and chemical mutagenesis. Int J Radiat Biol 2021; 98:82-89. [PMID: 34587468 DOI: 10.1080/09553002.2021.1987567] [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: 10/20/2022]
Abstract
PURPOSE Kala Jirga and Ajara Ghansal are the non-basmati aromatic rice landraces having small grains and good cooking qualities. In spite of huge demand these landraces are cultivated in a few pockets of Kolhapur district of India due to micro-climate required for the development of aroma and grain quality. Both the varieties are late maturing (> 160 days), tall (> 140 cm) and highly susceptible to lodging which resulted into low productivity. To overcome these constraints, induced mutation was attempted to improve the traits in these important rice landraces. MATERIAL AND METHODS Seeds of two landraces were treated with three concentrations/doses of Ethyl methanesulphonate (EMS), Sodium Azide (SA) and Gamma (γ) rays. Putative mutants were identified and isolated in M2 generation for desirable traits by comparing with adjacent untreated control. Putative mutants were grown in three replications to test their breeding behavior and other economical traits in M3 generation. RESULTS In the present study, differential response of landraces toward mutagenic treatments was observed which resulted into greater number of putative mutants in Ajara Ghansal (56 putative mutants) as compared to Kala Jirga (24 putative mutants). EMS induced the highest mutation frequency followed by Gamma rays and SA. In M3 generation, fifteen and eighteen mutants of Kala Jirga and Ajara Ghansal respectively exhibited true breeding for mutant traits, while rest of the putative mutants had very poor agronomic traits or reverted back to their normal trait. Desirable mutants of both the landraces viz., dwarf, early, nonlodging and more tillers with high yield were very promising and can be released for commercial cultivation after multi-location testing or used in crossing program as a donor for desirable traits. CONCLUSIONS Induced mutations were found to be very useful to improve the specific defect present in both landraces. The desirable mutants with early maturity and high number of tillers may prove useful in the improvement of aromatic rice.
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Affiliation(s)
- Shitalkumar Desai
- Laboratory of Cytogenetics and Plant Breeding, Department of Botany, Shivaji University, Kolhapur, India
| | - Akesh Jadhav
- Laboratory of Cytogenetics and Plant Breeding, Department of Botany, Shivaji University, Kolhapur, India
| | - Akash Ramteke
- Laboratory of Cytogenetics and Plant Breeding, Department of Botany, Shivaji University, Kolhapur, India
| | - Vinod Dhole
- Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Mumbai, India
| | - Vishwas Bapat
- Department of Biotechnology, Shivaji University, Kolhapur, India
| | - Nikhil Gaikwad
- Laboratory of Cytogenetics and Plant Breeding, Department of Botany, Shivaji University, Kolhapur, India
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Hamblin MR, Abrahamse H. Oxygen-Independent Antimicrobial Photoinactivation: Type III Photochemical Mechanism? Antibiotics (Basel) 2020; 9:antibiotics9020053. [PMID: 32023978 PMCID: PMC7168166 DOI: 10.3390/antibiotics9020053] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [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: 12/28/2019] [Revised: 01/28/2020] [Accepted: 01/29/2020] [Indexed: 01/04/2023] Open
Abstract
Since the early work of the 1900s it has been axiomatic that photodynamic action requires the presence of sufficient ambient oxygen. The Type I photochemical pathway involves electron transfer reactions leading to the production of reactive oxygen species (superoxide, hydrogen peroxide, and hydroxyl radicals), while the Type II pathway involves energy transfer from the PS (photosensitizer) triplet state, leading to production of reactive singlet oxygen. The purpose of the present review is to highlight the possibility of oxygen-independent photoinactivation leading to the killing of pathogenic bacteria, which may be termed the "Type III photochemical pathway". Psoralens can be photoactivated by ultraviolet A (UVA) light to produce DNA monoadducts and inter-strand cross-links that kill bacteria and may actually be more effective in the absence of oxygen. Tetracyclines can function as light-activated antibiotics, working by a mixture of oxygen-dependent and oxygen independent pathways. Again, covalent adducts may be formed in bacterial ribosomes. Antimicrobial photodynamic inactivation can be potentiated by addition of several different inorganic salts, and in the case of potassium iodide and sodium azide, bacterial killing can be achieved in the absence of oxygen. The proposed mechanism involves photoinduced electron transfer that produces reactive inorganic radicals. These new approaches might be useful to treat anaerobic infections or infections in hypoxic tissue.
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Affiliation(s)
- Michael R Hamblin
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Dermatology, Harvard Medical School, Boston, MA 02115, USA
- Laser Research Centre, Faculty of Health Science, University of Johannesburg, Doornfontein 2028, South Africa;
- Correspondence:
| | - Heidi Abrahamse
- Laser Research Centre, Faculty of Health Science, University of Johannesburg, Doornfontein 2028, South Africa;
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Urrutia MN, Ortiz CS, Alovero FL. Mechanistic Insight into the Photodynamic Effect Mediated by Neutral Red and a New Azine Compound in Staphylococcus aureus Cells. Chem Biodivers 2019; 16:e1900262. [PMID: 31429182 DOI: 10.1002/cbdv.201900262] [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: 05/15/2019] [Accepted: 08/19/2019] [Indexed: 11/09/2022]
Abstract
The photodynamic activity of Neutral Red and the new monobrominated Neutral Red was studied in suspensions of Staphylococcus aureus. The effect of mannitol and sodium azide in the presence of 25 μm photosensitizer on lethal photosensitization were investigated. The results of the mechanistic evaluation of Neutral Red showed that both mannitol and sodium azide produced a completed protective effect after irradiation without significant differences between them. The evaluation of monobrominated Neutral Red also showed a protective effect of microorganisms with the addition of mannitol. Although sodium azide produced a protective effect of the photoinactivation, it was incomplete and less than that exhibited by mannitol. The results indicate that the starting reagent, Neutral Red, is a producer of radical species, acting through a type I mechanism, whereas the halogenated derivative of Neutral Red produced reactive oxygen species and a contribution of singlet molecular oxygen cannot be discarded in the photoinactivation of Staphylococcus aureus cells. These results, analyzed together with the previously evaluated properties of the dyes, allow us to explain the differences observed in the photoinactivation of Staphylococcus aureus mediated by both azine photosensitizers.
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Affiliation(s)
- María Noel Urrutia
- Departamento de Ciencias Farmacéuticas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina.,Present address: Interdisciplinary Science and Technology Building 5 (ISTB5), School of Molecular Sciences, Arizona State University (ASU), 600 E. Tyler Mall, Tempe, Arizona, 85287-1604, USA
| | - Cristina S Ortiz
- Departamento de Ciencias Farmacéuticas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina
| | - Fabiana L Alovero
- Departamento de Ciencias Farmacéuticas, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina.,Unidad de Investigación y Desarrollo en Tecnología Farmacéutica (UNITEFA-CONICET), X5000HUA, Córdoba, Argentina
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de Souza Gonçalves B, de Moura Valadares JM, Alves SLG, Silva SC, Rangel LP, Cortes VF, Villar JAFP, Barbosa LA, de Lima Santos H. Evaluation of neuroprotective activity of digoxin and semisynthetic derivatives against partial chemical ischemia. J Cell Biochem 2019; 120:17108-17122. [PMID: 31310381 DOI: 10.1002/jcb.28971] [Citation(s) in RCA: 4] [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: 06/16/2018] [Revised: 03/29/2019] [Accepted: 04/08/2019] [Indexed: 02/06/2023]
Abstract
Recently, cardiotonic steroids (CTS) have been shown to lead to the activation of Na,K-ATPase at low concentrations in brain, promoting neuroprotection against ischemia. We report here the results of the use of digoxin and its semisynthetic derivatives BD-14, BD-15, and BD-16 against partial chemical ischemic induction followed by reperfusion in murine neuroblastoma cells neuro-2a (N2a). For chemical ischemic induction, sodium azide (5 mM) was used for 5 hours, and then reperfusion was induced for 24 hours. Na,K-ATPase activity and protein levels were analyzed in membrane preparation of N2a cells pretreated with the compounds (150 nM), in the controls and in induced chemical ischemia. In the Na,K-ATPase activity and protein levels assays, the steroids digoxin and BD-15 demonstrated a capacity to modulate the activity of the enzyme directly, increasing its levels of expression and activity. Oxidative parameters, such as superoxide dismutase (SOD) activity, lipid peroxidation (thiobarbituric acid reactive substance), glutathione peroxidase (GPx), glutathione (GSH) levels, hydrogen peroxide content, and the amount of free radicals (reactive oxygen species) during induced chemical ischemia were also evaluated. Regarding the redox state, lipid peroxidation, hydrogen peroxide content, and GPx activity, we have observed an increase in the chemical ischemic group, and a reduction in the groups treated with CTS. SOD activity increased in all treated groups when compared to control and GSH levels decreased when treated with sodium azide and did not change with CTS treatments. Regarding the lipid profile, we saw a decrease in the content of phospholipids and cholesterol in the chemical ischemic group, and an increase in the groups treated with CTS. In conclusion, the compounds used in this study demonstrate promising results, since they appear to promote neuroprotection in cells exposed to chemical ischemia.
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Affiliation(s)
- Bruno de Souza Gonçalves
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | | | - Silmara L G Alves
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - Simone C Silva
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - Luciana P Rangel
- Laboratório de Bioquímica Tumoral, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Vanessa F Cortes
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - José A F P Villar
- Laboratório de Síntese Orgânica e Nanoestruturas, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - Leandro A Barbosa
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
| | - Hérica de Lima Santos
- Laboratório de Bioquímica Celular, Universidade Federal de São João del Rei, Divinópolis, Minas Gerais, Brazil
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Hamblin MR, Abrahamse H. Inorganic Salts and Antimicrobial Photodynamic Therapy: Mechanistic Conundrums? Molecules 2018; 23:E3190. [PMID: 30514001 DOI: 10.3390/molecules23123190] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [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: 10/22/2018] [Revised: 11/15/2018] [Accepted: 11/17/2018] [Indexed: 11/25/2022] Open
Abstract
We have recently discovered that the photodynamic action of many different photosensitizers (PSs) can be dramatically potentiated by addition of a solution containing a range of different inorganic salts. Most of these studies have centered around antimicrobial photodynamic inactivation that kills Gram-negative and Gram-positive bacteria in suspension. Addition of non-toxic water-soluble salts during illumination can kill up to six additional logs of bacterial cells (one million-fold improvement). The PSs investigated range from those that undergo mainly Type I photochemical mechanisms (electron transfer to produce superoxide, hydrogen peroxide, and hydroxyl radicals), such as phenothiazinium dyes, fullerenes, and titanium dioxide, to those that are mainly Type II (energy transfer to produce singlet oxygen), such as porphyrins, and Rose Bengal. At one extreme of the salts is sodium azide, that quenches singlet oxygen but can produce azide radicals (presumed to be highly reactive) via electron transfer from photoexcited phenothiazinium dyes. Potassium iodide is oxidized to molecular iodine by both Type I and Type II PSs, but may also form reactive iodine species. Potassium bromide is oxidized to hypobromite, but only by titanium dioxide photocatalysis (Type I). Potassium thiocyanate appears to require a mixture of Type I and Type II photochemistry to first produce sulfite, that can then form the sulfur trioxide radical anion. Potassium selenocyanate can react with either Type I or Type II (or indeed with other oxidizing agents) to produce the semi-stable selenocyanogen (SCN)2. Finally, sodium nitrite may react with either Type I or Type II PSs to produce peroxynitrate (again, semi-stable) that can kill bacteria and nitrate tyrosine. Many of these salts (except azide) are non-toxic, and may be clinically applicable.
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Szurman-Zubrzycka ME, Zbieszczyk J, Marzec M, Jelonek J, Chmielewska B, Kurowska MM, Krok M, Daszkowska-Golec A, Guzy-Wrobelska J, Gruszka D, Gajecka M, Gajewska P, Stolarek M, Tylec P, Sega P, Lip S, Kudełko M, Lorek M, Gorniak-Walas M, Malolepszy A, Podsiadlo N, Szyrajew KP, Keisa A, Mbambo Z, Todorowska E, Gaj M, Nita Z, Orlowska-Job W, Maluszynski M, Szarejko I. HorTILLUS-A Rich and Renewable Source of Induced Mutations for Forward/Reverse Genetics and Pre-breeding Programs in Barley ( Hordeum vulgare L.). Front Plant Sci 2018; 9:216. [PMID: 29515615 PMCID: PMC5826354 DOI: 10.3389/fpls.2018.00216] [Citation(s) in RCA: 20] [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] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Accepted: 02/05/2018] [Indexed: 05/23/2023]
Abstract
TILLING (Targeting Induced Local Lesions IN Genomes) is a strategy used for functional analysis of genes that combines the classical mutagenesis and a rapid, high-throughput identification of mutations within a gene of interest. TILLING has been initially developed as a discovery platform for functional genomics, but soon it has become a valuable tool in development of desired alleles for crop breeding, alternative to transgenic approach. Here we present the HorTILLUS ( Hordeum-TILLING-University of Silesia) population created for spring barley cultivar "Sebastian" after double-treatment of seeds with two chemical mutagens: sodium azide (NaN3) and N-methyl-N-nitrosourea (MNU). The population comprises more than 9,600 M2 plants from which DNA was isolated, seeds harvested, vacuum-packed, and deposited in seed bank. M3 progeny of 3,481 M2 individuals was grown in the field and phenotyped. The screening for mutations was performed for 32 genes related to different aspects of plant growth and development. For each gene fragment, 3,072-6,912 M2 plants were used for mutation identification using LI-COR sequencer. In total, 382 mutations were found in 182.2 Mb screened. The average mutation density in the HorTILLUS, estimated as 1 mutation per 477 kb, is among the highest mutation densities reported for barley. The majority of mutations were G/C to A/T transitions, however about 8% transversions were also detected. Sixty-one percent of mutations found in coding regions were missense, 37.5% silent and 1.1% nonsense. In each gene, the missense mutations with a potential effect on protein function were identified. The HorTILLUS platform is the largest of the TILLING populations reported for barley and best characterized. The population proved to be a useful tool, both in functional genomic studies and in forward selection of barley mutants with required phenotypic changes. We are constantly renewing the HorTILLUS population, which makes it a permanent source of new mutations. We offer the usage of this valuable resource to the interested barley researchers on cooperative basis.
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Affiliation(s)
- Miriam E. Szurman-Zubrzycka
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Justyna Zbieszczyk
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Marek Marzec
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Janusz Jelonek
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Beata Chmielewska
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Marzena M. Kurowska
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Milena Krok
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Agata Daszkowska-Golec
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Justyna Guzy-Wrobelska
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Damian Gruszka
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Monika Gajecka
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Patrycja Gajewska
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Magdalena Stolarek
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Piotr Tylec
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Paweł Sega
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Sabina Lip
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Monika Kudełko
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Magdalena Lorek
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Małgorzata Gorniak-Walas
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Anna Malolepszy
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Nina Podsiadlo
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Katarzyna P. Szyrajew
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Anete Keisa
- Department of Microbiology and Biotechnology, Faculty of Biology, University of Latvia, Riga, Latvia
| | - Zodwa Mbambo
- Biosciences, Council for Scientific and Industrial Research, Pretoria, South Africa
| | | | - Marek Gaj
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Zygmunt Nita
- Seed Company Plant Breeding Strzelce Ltd., Plant Breeding and Acclimatization Institute, Błonie, Poland
| | - Wanda Orlowska-Job
- Seed Company Plant Breeding Strzelce Ltd., Plant Breeding and Acclimatization Institute, Błonie, Poland
| | - Miroslaw Maluszynski
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
| | - Iwona Szarejko
- Department of Genetics, Faculty of Biology and Environmental Protection, University of Silesia, Katowice, Poland
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Kho DT, Johnson RH, O'Carroll SJ, Angel CE, Graham ES. Biosensor Technology Reveals the Disruption of the Endothelial Barrier Function and the Subsequent Death of Blood Brain Barrier Endothelial Cells to Sodium Azide and Its Gaseous Products. Biosensors (Basel) 2017; 7:bios7040041. [PMID: 28934106 PMCID: PMC5746764 DOI: 10.3390/bios7040041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Revised: 09/16/2017] [Accepted: 09/18/2017] [Indexed: 01/08/2023]
Abstract
Herein we demonstrate the sensitive nature of human blood-brain barrier (BBB) endothelial cells to sodium azide and its gaseous product. Sodium azide is known to be acutely cytotoxic at low millimolar concentrations, hence its use as a biological preservative (e.g., in antibodies). Loss of barrier integrity was noticed in experiments using Electric Cell-substrate Impedance Sensing (ECIS) biosensor technology, to measure endothelial barrier integrity continuously in real-time. Initially the effect of sodium azide was observed as an artefact where it was present in antibodies being employed in neutralisation experiments. This was confirmed where antibody clones that were azide-free did not mediate loss of barrier function. A delayed loss of barrier function in neighbouring wells implied the influence of a liberated gaseous product. ECIS technology demonstrated that the BBB endothelial cells had a lower level of direct sensitivity to sodium azide of ~3 µM. Evidence of gaseous toxicity was consistently observed at 30 µM and above, with disrupted barrier function and cell death in neighbouring wells. We highlight the ability of this cellular biosensor technology to reveal both the direct and gaseous toxicity mediated by sodium azide. The sensitivity and temporal dimension of ECIS technology was instrumental in these observations. These findings have substantial implications for the wide use of sodium azide in biological reagents, raising issues of their application in live-cell assays and with regard to the protection of the user. This research also has wider relevance highlighting the sensitivity of brain endothelial cells to a known mitochondrial disruptor. It is logical to hypothesise that BBB endothelial dysfunction due to mitochondrial dys-regulation could have an important but underappreciated role in a range of neurological diseases.
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Affiliation(s)
- Dan T Kho
- Department of Pharmacology and Clinical Pharmacology, School of Medical Sciences, Faculty of Medical and Health Sciences, University of Auckland, Auckland 1010, New Zealand.
- Centre for Brain Research, University of Auckland, Auckland 1010, New Zealand.
| | - Rebecca H Johnson
- Department of Pharmacology and Clinical Pharmacology, School of Medical Sciences, Faculty of Medical and Health Sciences, University of Auckland, Auckland 1010, New Zealand.
- Centre for Brain Research, University of Auckland, Auckland 1010, New Zealand.
| | - Simon J O'Carroll
- Centre for Brain Research, University of Auckland, Auckland 1010, New Zealand.
- Department of Anatomy and Medical Imaging, School of Medical Sciences, Faculty of Medical and Health Sciences, University of Auckland, Auckland 1010, New Zealand.
| | - Catherine E Angel
- School of Biological Sciences, Faculty of Science, University of Auckland, Auckland 1010, New Zealand.
| | - E Scott Graham
- Department of Pharmacology and Clinical Pharmacology, School of Medical Sciences, Faculty of Medical and Health Sciences, University of Auckland, Auckland 1010, New Zealand.
- Centre for Brain Research, University of Auckland, Auckland 1010, New Zealand.
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Abstract
In the present study, sodium azide (SA) toxicity and the anti-mutagenic effects of different algal extracts at 0.1% and 0.2% concentrations were studied on the mitotic index (MI), chromosomal and nuclear aberrations using Allium cepa L. root assay. Moreover, phytochemical screening of photosynthetic pigments, antioxidants compounds, total antioxidant, DPPH scavenging activity, polysaccharides, and phenolic contents were done for two red seaweeds (Laurencia obtusa (Hudson) Lamouroux and Polysiphonia morrowii Harvey) and for one brown seaweed (Dictyopteris delicatula Lamouroux). Treatment with 300 μg/ml sodium azide (SA) induced the highest number of aberrations in A. cepa root. A highly significant decrease in the MI appeared after treatment with SA, whereas its value increased following different algal extracts treatments. The highest anti-mutagenic inhibition activity of Dictyopteris delicatula added at 0.2% concentration was 72.96%, 69.84%, 56.89% and 43.59% with the algal polyphenol, polysaccharide, aqueous and methanol extract treatments, respectively. The different algal extracts minimized the genotoxicity and exhibited anti-mutagenic potential against SA in a dose-dependent manner. Phytochemical studies showed that Dictyopteris delicatula contained the highest total phenol, chlorophyll-a and carotenoid quantity. Moreover it exhibited the highest total antioxidant and DPPH scavenging activities. Total polysaccharides and the weight percentage of sulphated polysaccharides were relatively higher in Polysiphonia morrowii followed by Laurencia obtusa. Hydroquinone and bromophenol were detected only in the studied brown and red seaweeds, respectively. Polysiphonia morrowii and Laurencia obtusa contained the highest quantity of galactose, rhmnose and xylose, while Dictyopteris delicatula contained fucose and mannitol as main monosaccharide units. In conclusion, the studied seaweeds may be considered as rich sources of natural antioxidants. Meanwhile the investigated different algal extracts can minimize the genotoxicity in a dose-dependent manner and exhibit anti-mutagenic potential against the mutagenic substance sodium azide.
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Affiliation(s)
- Hoda Anwer Mansour
- Botany Department, Faculty of Science, Ain Shams University, Abassia, Cairo, Egypt
| | - Hala Mahfouz
- Botany Department, Faculty of Science, Ain Shams University, Abassia, Cairo, Egypt
| | - Nesma Maher
- Botany Department, Faculty of Science, Ain Shams University, Abassia, Cairo, Egypt
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Pandey JL, Kiemle SN, Richard TL, Zhu Y, Cosgrove DJ, Anderson CT. Investigating Biochemical and Developmental Dependencies of Lignification with a Click-Compatible Monolignol Analog in Arabidopsis thaliana Stems. Front Plant Sci 2016; 7:1309. [PMID: 27630649 PMCID: PMC5005335 DOI: 10.3389/fpls.2016.01309] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Accepted: 08/16/2016] [Indexed: 05/29/2023]
Abstract
Lignin is a key structural component of plant cell walls that provides rigidity, strength, and resistance against microbial attacks. This hydrophobic polymer also serves a crucial role in water transport. Despite its abundance and essential functions, several aspects of lignin biosynthesis and deposition remain cryptic. Lignin precursors are known to be synthesized in the cytoplasm by complex biosynthetic pathways, after which they are transported to the apoplastic space, where they are polymerized via free radical coupling reactions into polymeric lignin. However, the lignin deposition process and the factors controlling it are unclear. In this study, the biochemical and developmental dependencies of lignification were investigated using a click-compatible monolignol analog, 3-O-propargylcaffeyl alcohol (3-OPC), which can incorporate into both in vitro polymerized lignin and Arabidopsis thaliana tissues. Fluorescence labeling of 3-OPC using click chemistry followed by confocal fluorescence microscopy enabled the detection and imaging of 3-OPC incorporation patterns. These patterns were consistent with endogenous lignification observed in different developmental stages of Arabidopsis stems. However, the concentration of supplied monolignols influenced where lignification occurred at the subcellular level, with low concentrations being deposited in cell corners and middle lamellae and high concentrations also being deposited in secondary walls. Experimental inhibition of multiple lignification factors confirmed that 3-OPC incorporation proceeds via a free radical coupling mechanism involving peroxidases/laccases and reactive oxygen species (ROS). Finally, the presence of peroxide-producing enzymes determined which cell walls lignified: adding exogenous peroxide and peroxidase caused cells that do not naturally lignify in Arabidopsis stems to lignify. In summary, 3-OPC accurately mimics natural lignification patterns in different developmental stages of Arabidopsis stems and allows for the dissection of key biochemical and enzymatic factors controlling lignification.
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Affiliation(s)
- Jyotsna L. Pandey
- Department of Agricultural and Biological Engineering, The Pennsylvania State University, University ParkPA, USA
- Center for Lignocellulose Structure and Formation, The Pennsylvania State University, University ParkPA, USA
| | - Sarah N. Kiemle
- Center for Lignocellulose Structure and Formation, The Pennsylvania State University, University ParkPA, USA
- Department of Biology, The Pennsylvania State University, University ParkPA, USA
| | - Tom L. Richard
- Department of Agricultural and Biological Engineering, The Pennsylvania State University, University ParkPA, USA
- Center for Lignocellulose Structure and Formation, The Pennsylvania State University, University ParkPA, USA
| | - Yimin Zhu
- Center for Lignocellulose Structure and Formation, The Pennsylvania State University, University ParkPA, USA
- Department of Chemistry, Altoona College, The Pennsylvania State University, AltoonaPA, USA
| | - Daniel J. Cosgrove
- Center for Lignocellulose Structure and Formation, The Pennsylvania State University, University ParkPA, USA
- Department of Biology, The Pennsylvania State University, University ParkPA, USA
| | - Charles T. Anderson
- Center for Lignocellulose Structure and Formation, The Pennsylvania State University, University ParkPA, USA
- Department of Biology, The Pennsylvania State University, University ParkPA, USA
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Money TGA, Sproule MKJ, Cross KP, Robertson RM. Octopamine stabilizes conduction reliability of an unmyelinated axon during hypoxic stress. J Neurophysiol 2016; 116:949-59. [PMID: 27281750 DOI: 10.1152/jn.00354.2016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [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: 05/09/2016] [Accepted: 06/03/2016] [Indexed: 11/22/2022] Open
Abstract
Mechanisms that could mitigate the effects of hypoxia on neuronal signaling are incompletely understood. We show that axonal performance of a locust visual interneuron varied depending on oxygen availability. To induce hypoxia, tracheae supplying the thoracic nervous system were surgically lesioned and action potentials in the axon of the descending contralateral movement detector (DCMD) neuron passing through this region were monitored extracellularly. The conduction velocity and fidelity of action potentials decreased throughout a 45-min experiment in hypoxic preparations, whereas conduction reliability remained constant when the tracheae were left intact. The reduction in conduction velocity was exacerbated for action potentials firing at high instantaneous frequencies. Bath application of octopamine mitigated the loss of conduction velocity and fidelity. Action potential conduction was more vulnerable in portions of the axon passing through the mesothoracic ganglion than in the connectives between ganglia, indicating that hypoxic modulation of the extracellular environment of the neuropil has an important role to play. In intact locusts, octopamine and its antagonist, epinastine, had effects on the entry to, and recovery from, anoxic coma consistent with octopamine increasing overall neural performance during hypoxia. These effects could have functional relevance for the animal during periods of environmental or activity-induced hypoxia.
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Affiliation(s)
- T G A Money
- Department of Biology, Queen's University, Kingston, Ontario, Canada; and
| | - M K J Sproule
- Department of Biology, Queen's University, Kingston, Ontario, Canada; and
| | - K P Cross
- Centre for Neuroscience Studies, Queen's University, Kingston, Ontario, Canada
| | - R M Robertson
- Department of Biology, Queen's University, Kingston, Ontario, Canada; and Centre for Neuroscience Studies, Queen's University, Kingston, Ontario, Canada
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Nadhman A, Sirajuddin M, Nazir S, Yasinzai M. Photo-induced Leishmania DNA degradation by silver-doped zinc oxide nanoparticle: an in-vitro approach. IET Nanobiotechnol 2016; 10:129-133. [PMID: 27256892 PMCID: PMC8676311 DOI: 10.1049/iet-nbt.2015.0015] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [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] [Received: 02/16/2015] [Revised: 08/17/2015] [Accepted: 09/06/2015] [Indexed: 12/25/2023] Open
Abstract
Recently, the authors reported newly synthesised polyethylene glycol (PEG)ylated silver (9%)-doped zinc oxide nanoparticle (doped semiconductor nanoparticle (DSN)) which has high potency for killing Leishmania tropica by producing reactive oxygen species on exposure to sunlight. The current report is focused on Leishmania DNA interaction and damage caused by the DSN. Here, we showed that the damage to Leishmania DNA was indirect, as the DSN was unable to interact with the DNA in intact Leishmania cell, indicating the incapability of PEGylated DSN to cross the nucleus barrier. The DNA damage was the result of high production of singlet oxygen on exposure to sunlight. The DNA damage was successfully prevented by singlet oxygen scavenger (sodium azide) confirming involvement of the highly energetic singlet oxygen in the DNA degradation process.
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Affiliation(s)
- Akhtar Nadhman
- Nanosciences and Catalysis Division, National Centre for physics, Shahdra Valley Road, Quaid-i-Azam University campus, Islamabad, Pakistan.
| | - Muhammad Sirajuddin
- Department of Chemistry, University of Science & Technology, Bannu, Pakistan
| | - Samina Nazir
- Nanosciences and Catalysis Division, National Centre for physics, Shahdra Valley Road, Quaid-i-Azam University campus, Islamabad, Pakistan
| | - Masoom Yasinzai
- Center of Interdisciplinary Research, International Islamic University, Islamabad, Pakistan
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20
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Kim SB, Kim KJ, Cho MH, Kim JH, Kim KT, Kim SH. Micro- and Nanoscale Energetic Materials as Effective Heat Energy Sources for Enhanced Gas Generators. ACS Appl Mater Interfaces 2016; 8:9405-9412. [PMID: 27007287 DOI: 10.1021/acsami.6b00070] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this study, we systematically investigated the effect of micro- and nanoscale energetic materials in formulations of aluminum microparticles (Al MPs; heat source)/aluminum nanoparticles (Al NPs; heat source)/copper oxide nanoparticles (CuO NPs; oxidizer) on the combustion and gas-generating properties of sodium azide microparticles (NaN3 MPs; gas-generating agent) for potential applications in gas generators. The burn rate of the NaN3 MP/CuO NP composite powder was only ∼0.3 m/s. However, the addition of Al MPs and Al NPs to the NaN3 MP/CuO NP matrix caused the rates to reach ∼1.5 and ∼5.3 m/s, respectively. In addition, the N2 gas volume flow rate generated by the ignition of the NaN3 MP/CuO NP composite powder was only ∼0.6 L/s, which was significantly increased to ∼1.4 and ∼3.9 L/s by adding Al MPs and Al NPs, respectively, to the NaN3 MP/CuO NP composite powder. This suggested that the highly reactive Al MPs and NPs, with the assistance of CuO NPs, were effective heat-generating sources enabling the complete thermal decomposition of NaN3 MPs upon ignition. Al NPs were more effective than Al MPs in the gas generators because of the increased reactivity induced by the reduced particle size. Finally, we successfully demonstrated that a homemade airbag with a specific volume of ∼140 mL could be rapidly and fully inflated by the thermal activation of nanoscale energetic material-added gas-generating agents (i.e., NaN3 MP/Al NP/CuO NP composites) within the standard time of ∼50 ms for airbag inflation.
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Affiliation(s)
- Sang Beom Kim
- Department of Nano Fusion Technology, College of Nanoscience and Nanotechnology, Pusan National University , 30 Jangjeon-dong, Geumjung-gu, Busan 609-735, Republic of Korea
| | - Kyung Ju Kim
- Department of Nano Fusion Technology, College of Nanoscience and Nanotechnology, Pusan National University , 30 Jangjeon-dong, Geumjung-gu, Busan 609-735, Republic of Korea
| | - Myung Hoon Cho
- Department of Nano Fusion Technology, College of Nanoscience and Nanotechnology, Pusan National University , 30 Jangjeon-dong, Geumjung-gu, Busan 609-735, Republic of Korea
| | - Ji Hoon Kim
- Department of Nano Fusion Technology, College of Nanoscience and Nanotechnology, Pusan National University , 30 Jangjeon-dong, Geumjung-gu, Busan 609-735, Republic of Korea
| | - Kyung Tae Kim
- Powder & Ceramic Division, Korean Institute of Materials and Science , 797 Changwon-daero, Seongsan-gu, Changwon-si, Gyeongnam 642-731, Republic of Korea
| | - Soo Hyung Kim
- Department of Nano Fusion Technology, College of Nanoscience and Nanotechnology, Pusan National University , 30 Jangjeon-dong, Geumjung-gu, Busan 609-735, Republic of Korea
- Department of Nano Energy Engineering, College of Nanoscience and Nanotechnology, Pusan National University 30 Jangjeon-dong, Geumjung-gu, Busan 609-735, Republic of Korea
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21
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Sirimontree P, Fukamizo T, Suginta W. Azide anions inhibit GH-18 endochitinase and GH-20 Exo β-N-acetylglucosaminidase from the marine bacterium Vibrio harveyi. J Biochem 2015; 159:191-200. [PMID: 26330565 DOI: 10.1093/jb/mvv087] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [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: 05/25/2015] [Accepted: 08/02/2015] [Indexed: 11/14/2022] Open
Abstract
Vibrio harveyi is a bioluminescent marine bacterium that utilizes chitin as its sole source of energy. In the course of chitin degradation, the bacterium primarily secretes an endochitinase A (VhChiA) to hydrolyze chitin, generating chitooligosaccharide fragments that are readily transported into the cell and broken down to GlcNAc monomers by an exo β-N-acetylglucosaminidase (VhGlcNAcase). Here we report that sodium salts, especially sodium azide, inhibit two classes of these chitin-degrading enzymes (VhChiA and VhGlcNAcase) with distinct modes of action. Kinetic analysis of the enzymatic hydrolysis of pNP-glycoside substrates reveals that sodium azide inhibition of VhChiA has a mixed-type mode, but that it inhibits VhGlcNAcase competitively. We propose that azide anions inhibit chitinase activity by acting as strong nucleophiles that attack Cγ of the catalytic Glu or Cβ of the neighbouring Asp residues. Azide anions may bind not only to the catalytic centre, but also to the other subsites in the substrate-binding cleft of VhChiA. In contrast, azide anions may merely occupy the small-binding pocket of VhGlcNAcase, thereby blocking the accessibility of its active site by short-chain substrates.
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Affiliation(s)
- Paknisa Sirimontree
- Biochemistry-Electrochemistry Research Unit, School of Biochemistry, Suranaree University of Technology, Nakhon Ratchasima, Thailand and
| | - Tamo Fukamizo
- Department of Advanced Biosciences, Kinki University, Nara, Japan
| | - Wipa Suginta
- Biochemistry-Electrochemistry Research Unit, School of Biochemistry, Suranaree University of Technology, Nakhon Ratchasima, Thailand and
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22
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Chai H, Guo R, Yin W, Cheng L, Liu R, Chu C. One-pot, three-component reaction using modified Julia reagents: a facile synthesis of 4,5-disubstituted 1,2,3-(NH)-triazoles in a wet organic solvent. ACS Comb Sci 2015; 17:147-51. [PMID: 25629450 DOI: 10.1021/co5001597] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A new one-pot, three component reaction involving the use of Julia reagent, aldehyde, and sodium azide was developed for the efficient synthesis of N-unsubstituted 1,2,3-triazoles. This reaction could be carried out under mild reaction conditions without any precaution, and broad scope of substrates, both respect to Julia reagents and aldehydes, could be applied in this reaction system in generation of a small library of title compounds.
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Affiliation(s)
- Huihui Chai
- School of Pharmacy, Shanghai
Key Laboratory of New Drug Design, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Ruiqiang Guo
- School of Pharmacy, Shanghai
Key Laboratory of New Drug Design, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Wei Yin
- School of Pharmacy, Shanghai
Key Laboratory of New Drug Design, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Lingping Cheng
- School of Pharmacy, Shanghai
Key Laboratory of New Drug Design, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Renhua Liu
- School of Pharmacy, Shanghai
Key Laboratory of New Drug Design, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Changhu Chu
- School of Pharmacy, Shanghai
Key Laboratory of New Drug Design, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
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23
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Hussin WA, Ismail MA, Alzahrani AM, El-Sayed WM. Evaluation of the biological activity of novel monocationic fluoroaryl-2,2'-bichalcophenes and their analogues. Drug Des Devel Ther 2014; 8:963-72. [PMID: 25114506 PMCID: PMC4109633 DOI: 10.2147/dddt.s66469] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
A series of bichalcophene fluorobenzamidines 5a–e was synthesized from the corresponding mononitriles 4a–e via a direct reaction with lithium bis(trimethylsilyl)amide LiN(TMS)2 followed by de-protection with ethanolic HCl (gas). Bichalcophene fluorobenzonitriles 4a–e were prepared adopting a Stille coupling reaction between the bromo compounds 3a–c and 2-(tri-n-butylstannyl)furan or analogues. As an approach to drug discovery, the structure–antimutagenicity relationship of novel fluoroarylbichalcophenes was examined using the Ames Salmonella/microsomal assay. At nontoxic concentrations (10 and 20 μM), all derivatives alone or in combination with sodium azide (NaN3; 2 μg/plate) or benzo[a]pyrene (B[a]P; 20 μM) in the presence of S9 mix were not mutagenic. The fluoroaryl derivatives significantly reduced the NaN3-induced and B[a]P-induced mutagenicity under pre-exposure and co-exposure conditions. The recorded antimutagenic activity of fluoroaryl derivatives varied depending on the kind of mutagen and the exposure regimen. Monocationic fluoroarylbichalcophenes were superior to the corresponding mononitriles in reducing B[a]P-induced mutagenicity. Nevertheless, mononitriles were more active against NaN3, especially at low concentrations and under pre-exposure treatments. The antimutagenic activity was congruent with a high antioxidant activity that could promote the DNA repair system. The fluorine substitution changed the antimutagenic signature of bichalcophenes. Some of these compounds could be selected for further anticancer studies.
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Affiliation(s)
- Warda A Hussin
- King Faisal University, College of Science, Departments of Chemistry and Biological Sciences, Hofuf, Saudi Arabia ; Al-Azhr University, Faculty of Science, Department of Botany and Microbiology, Cairo, Egypt
| | - Mohamed A Ismail
- King Faisal University, College of Science, Departments of Chemistry and Biological Sciences, Hofuf, Saudi Arabia ; Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, Egypt
| | - Abdullah M Alzahrani
- King Faisal University, College of Science, Departments of Chemistry and Biological Sciences, Hofuf, Saudi Arabia
| | - Wael M El-Sayed
- King Faisal University, College of Science, Departments of Chemistry and Biological Sciences, Hofuf, Saudi Arabia ; University of Ain Shams, Faculty of Science, Department of Zoology, Abbassia, Cairo, Egypt
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24
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Dédaldéchamp F, Saeedi S, Fleurat-Lessard P, Roblin G. Uptake and metabolic effects of salicylic acid on the pulvinar motor cells of Mimosa pudica L. Plant Physiol Biochem 2014; 74:125-132. [PMID: 24292275 DOI: 10.1016/j.plaphy.2013.11.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Accepted: 11/08/2013] [Indexed: 06/02/2023]
Abstract
In this paper, the salicylic acid (o-hydroxy benzoic acid) (SA) uptake by the pulvinar tissues of Mimosa pudica L. pulvini was shown to be strongly pH-dependent, increasing with acidity of the assay medium. This uptake was performed according to a unique affinity system (K(m) = 5.9 mM, V(m) = 526 pmol mgDW(-1)) in the concentration range of 0.1-5 mM. The uptake rate increased with increasing temperature (5-35 °C) and was inhibited following treatment with sodium azide (NaN3) and carbonyl cyanide m-chlorophenylhydrazone (CCCP), suggesting the involvement of an active component. Treatment with p-chloromercuribenzenesulfonic acid (PCMBS) did not modify the uptake, indicating that external thiol groups were not necessary. KCl, which induced membrane depolarization had no significant effect, and fusicoccin (FC), which hyperpolarized cell membrane, stimulated the uptake, suggesting that the pH component of the proton motive force was likely a driving force. These data suggest that the SA uptake by the pulvinar tissues may be driven by two components: an ion-trap mechanism playing a pivotal role and a putative carrier-mediated mechanism. Unlike other benzoic acid derivatives acting as classical respiration inhibitors (NaN3 and KCN), SA modified the pulvinar cell metabolism by increasing the respiration rate similar to CCCP and 2,4-dinitrophenol (DNP). Furthermore, SA inhibited the osmoregulated seismonastic reaction in a pH dependent manner and induced characteristic damage to the ultrastructural features of the pulvinar motor cells, particularly at the mitochondrial level.
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Affiliation(s)
- Fabienne Dédaldéchamp
- Université de Poitiers, EBI UMR CNRS 7267, Equipe Physiologie Moléculaire du Transport des Sucres, 3 rue Jacques Fort, 86022 Poitiers cedex, France.
| | - Saed Saeedi
- Université de Poitiers, EBI UMR CNRS 7267, Equipe Physiologie Moléculaire du Transport des Sucres, 3 rue Jacques Fort, 86022 Poitiers cedex, France
| | - Pierrette Fleurat-Lessard
- Université de Poitiers, EBI UMR CNRS 7267, Equipe Physiologie Moléculaire du Transport des Sucres, 3 rue Jacques Fort, 86022 Poitiers cedex, France
| | - Gabriel Roblin
- Université de Poitiers, EBI UMR CNRS 7267, Equipe Physiologie Moléculaire du Transport des Sucres, 3 rue Jacques Fort, 86022 Poitiers cedex, France
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25
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Mo YJ, Jeung JU, Shin YS, Park CS, Kang KH, Kim BK. Agronomic and genetic analysis of Suweon 542, a rice floury mutant line suitable for dry milling. Rice (N Y) 2013; 6:37. [PMID: 24321450 PMCID: PMC4883716 DOI: 10.1186/1939-8433-6-37] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Accepted: 12/05/2013] [Indexed: 05/07/2023]
Abstract
BACKGROUND Producing rice flour of good quality by dry milling is necessary to reduce milling costs and promote the processed rice food industry. This study was conducted to evaluate the dry milling properties of Suweon 542, a floury endosperm mutant, and identify the chromosomal region responsible for the floury endosperm characteristics. RESULTS Compared with the wild type, after dry milling process, the grain hardness of Suweon 542 was significantly lower because of its round and loosely packed starch granules. Also, the flour of Suweon 542 had significantly smaller particles and less damaged starch than Namil and other rice cultivars and its particle size distribution was similar to a commercial wheat cultivar. Considering that the yield loss of Suweon 542 due to its floury endosperm was largely compensated for by an increased number of spikelets per panicle, Suweon 542 has potential value as a raw material for rice flour production. Association analysis using 70 genome-wide SSR markers and 94 F2 plants derived from Suweon 542/Milyang 23 showed that markers on chromosome 5 explained a large portion of the variation in floury grains percentage (FGP). Further analysis with an increased number of SSR markers revealed that the floury endosperm of Suweon 542 was directed by a major recessive locus, flo7(t), located in the 19.33-19.86 Mbp region of chromosome 5, with RM18639 explaining 92.2% of FGP variation in the F2 population. CONCLUSIONS The floury endosperm of Suweon 542 is suitable for dry milling, with a small flour particle size and low damaged starch content. Further physical mapping of flo7(t), the floury endosperm locus of Suweon 542, would facilitate efficient breeding of rice cultivars with proper dry milling adaptability that can be used in the processed rice food industry.
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Affiliation(s)
- Young-Jun Mo
- />National Institute of Crop Science, Rural Development Administration, Suwon, 441-857 Republic of Korea
| | - Ji-Ung Jeung
- />National Institute of Crop Science, Rural Development Administration, Suwon, 441-857 Republic of Korea
| | - Young-Seop Shin
- />National Institute of Crop Science, Rural Development Administration, Suwon, 441-857 Republic of Korea
| | - Chul Soo Park
- />Department of Crop Science and Biotechnology, Chonbuk National University, Jeonju, 561-756 Republic of Korea
| | - Kyung-Ho Kang
- />National Institute of Crop Science, Rural Development Administration, Suwon, 441-857 Republic of Korea
| | - Bo-Kyeong Kim
- />National Institute of Crop Science, Rural Development Administration, Suwon, 441-857 Republic of Korea
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26
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Bhavsar SK, Hosseinzadeh Z, Brenner D, Honisch S, Jilani K, Liu G, Szteyn K, Sopjani M, Mak TW, Shumilina E, Lang F. Energy-sensitive regulation of Na+/K+-ATPase by Janus kinase 2. Am J Physiol Cell Physiol 2013; 306:C374-84. [PMID: 24304834 DOI: 10.1152/ajpcell.00320.2013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Janus kinase 2 (JAK2) contributes to intracellular signaling of leptin and erythropoietin, hormones protecting cells during energy depletion. The present study explores whether JAK2 is activated by energy depletion and regulates Na(+)/K(+)-ATPase, the major energy-consuming pump. In Jurkat cells, JAK2 activity was determined by radioactive kinase assay, phosphorylated JAK2 detected by Western blotting, ATP levels measured by luciferase assay, as well as Na(+)/K(+)-ATPase α1-subunit transcript and protein abundance determined by real-time PCR and Western blotting, respectively. Ouabain-sensitive K(+)-induced currents (Ipump) were measured by whole cell patch clamp. Ipump was further determined by dual-electrode voltage clamp in Xenopus oocytes injected with cRNA-encoding JAK2, active (V617F)JAK2, or inactive (K882E)JAK2. As a result, in Jurkat T cells, JAK2 activity significantly increased following energy depletion by sodium azide (NaN3) or 2,4- dinitro phenol (DNP). DNP- and NaN3-induced decrease of cellular ATP was significantly augmented by JAK2 inhibitor AG490 and blunted by Na(+)/K(+)-ATPase inhibitor ouabain. DNP decreased and AG490 enhanced Ipump as well as Na(+)/K(+)-ATPase α1-subunit transcript and protein abundance. The α1-subunit transcript levels were also enhanced by signal transducer and activator of transcription-5 inhibitor CAS 285986-31-4. In Xenopus oocytes, Ipump was significantly decreased by expression of JAK2 and (V617F)JAK2 but not of (K882E)JAK2, effects again reversed by AG490. In (V617F)JAK2-expressing Xenopus oocytes, neither DNP nor NaN3 resulted in further decline of Ipump. In Xenopus oocytes, the effect of (V617F)JAK2 on Ipump was not prevented by inhibition of transcription with actinomycin. In conclusion, JAK2 is a novel energy-sensing kinase that curtails energy consumption by downregulating Na(+)/K(+)-ATPase expression and activity.
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27
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Johnson GM, Chozinski TJ, Salmon DJ, Moghaddam AD, Chen HC, Miranda KM. Quantitative detection of nitroxyl upon trapping with glutathione and labeling with a specific fluorogenic reagent. Free Radic Biol Med 2013; 63:476-84. [PMID: 23685286 DOI: 10.1016/j.freeradbiomed.2013.05.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 05/08/2013] [Indexed: 11/25/2022]
Abstract
Donors of nitroxyl (HNO) have shown promise for treatment of stroke, heart failure, alcoholism and cancer. However, comparing the pharmacological capacities of various donors is difficult without first quantifying the amount of HNO released from each donor. Detection and quantitation of HNO has been complicated by the rapid self-consumption of HNO through irreversible dimerization, poor selectivity of trapping agents against other nitrogen oxides, and/or low sensitivity towards HNO. Here, an assay is described for the trapping of HNO by glutathione (GSH) followed by labeling of GSH with the fluorogenic agent, naphthalene-2,3-dicarboxaldehyde (NDA), and subsequent quantitation by fluorescence difference. The newly developed assay was used to validate the pH-dependence of HNO release from isopropylamine NONOate (IPA/NO), which is a dual donor of HNO and NO at physiological pH. Furthermore, varied assay conditions were utilized to suggest the ratios of the products of the reaction of GSH with HNO. At intracellular concentrations of GSH, the disulfide (GSSG) was the major product, but significant concentrations of glutathione sulfinamide (GS(O)NH₂) were also detected. This suggests that GS(O)NH₂, which is a selective biomarker of HNO, may be produced in concentrations that are amenable to in vivo analysis.
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Affiliation(s)
- Gail M Johnson
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721
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28
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Drugan RC, Hibl PT, Kelly KJ, Dady KF, Hale MW, Lowry CA. Prior cold water swim stress alters immobility in the forced swim test and associated activation of serotonergic neurons in the rat dorsal raphe nucleus. Neuroscience 2013; 253:221-34. [PMID: 23999122 DOI: 10.1016/j.neuroscience.2013.08.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Revised: 07/30/2013] [Accepted: 08/21/2013] [Indexed: 11/24/2022]
Abstract
Prior adverse experience alters behavioral responses to subsequent stressors. For example, exposure to a brief swim increases immobility in a subsequent swim test 24h later. In order to determine if qualitative differences (e.g. 19°C versus 25°C) in an initial stressor (15-min swim) impact behavioral, physiological, and associated neural responses in a 5-min, 25°C swim test 24h later, rats were surgically implanted with biotelemetry devices 1 week prior to experimentation then randomly assigned to one of six conditions (Day 1 (15 min)/Day 2 (5 min)): (1) home cage (HC)/HC, (2) HC/25°C swim, (3) 19°C swim/HC, (4) 19°C swim/25°C swim, (5) 25°C swim/HC, (6) 25°C swim/25°C swim. Core body temperature (Tb) was measured on Days 1 and 2 using biotelemetry; behavior was measured on Day 2. Rats were transcardially perfused with fixative 2h following the onset of the swim on Day 2 for analysis of c-Fos expression in midbrain serotonergic neurons. Cold water (19°C) swim on Day 1 reduced Tb, compared to both 25°C swim and HC groups on Day 1, and, relative to rats exposed to HC conditions on Day 1, reduced the hypothermic response to the 25°C swim on Day 2. The 19°C swim on Day 1, relative to HC exposure on Day 1, increased immobility during the 5-min swim on Day 2. Also, 19°C swim, relative to HC conditions, on Day 1 reduced swim (25°C)-induced increases in c-Fos expression in serotonergic neurons within the dorsal and interfascicular parts of the dorsal raphe nucleus. These results suggest that exposure to a 5-min 19°C cold water swim, but not exposure to a 5-min 25°C swim alters physiological, behavioral and serotonergic responses to a subsequent stressor.
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29
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Nakano M, Suzuki H, Imamura T, Lau A, Lynch B. Genotoxicity of pyrroloquinoline quinone (PQQ) disodium salt (BioPQQ™). Regul Toxicol Pharmacol 2013; 67:189-97. [PMID: 23891671 DOI: 10.1016/j.yrtph.2013.07.007] [Citation(s) in RCA: 17] [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] [Received: 02/27/2013] [Revised: 07/11/2013] [Accepted: 07/15/2013] [Indexed: 11/22/2022]
Abstract
The genotoxic potential of pyrroloquinoline quinone (PQQ) disodium salt (BioPQQ™) was evaluated in a battery of genotoxicity tests. The results of the bacterial mutation assay (Ames test) were negative. Weak positive results were obtained in 2 separate in vitro chromosomal aberration test in Chinese hamster lung (CHL) fibroblasts. Upon testing in an in vitro chromosomal aberration test in human peripheral blood lymphocytes, no genotoxic activity of PQQ was noted. In the in vivo micronucleus assay in mice, PQQ at doses up to 2,000 mg/kg body weight demonstrated that no genotoxic effects are expressed in vivo in bone marrow erythrocytes. The weak responses in the in vitro test CHL cells were considered of little relevance under conditions of likely human exposure. PQQ disodium was concluded to have no genotoxic activity in vivo.
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30
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Hall A, Larsen AK, Parhamifar L, Meyle KD, Wu LP, Moghimi SM. High resolution respirometry analysis of polyethylenimine-mediated mitochondrial energy crisis and cellular stress: Mitochondrial proton leak and inhibition of the electron transport system. Biochim Biophys Acta 2013; 1827:1213-25. [PMID: 23850549 DOI: 10.1016/j.bbabio.2013.07.001] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 06/07/2013] [Accepted: 07/02/2013] [Indexed: 01/09/2023]
Abstract
Polyethylenimines (PEIs) are highly efficient non-viral transfectants, but can induce cell death through poorly understood necrotic and apoptotic processes as well as autophagy. Through high resolution respirometry studies in H1299 cells we demonstrate that the 25kDa branched polyethylenimine (25k-PEI-B), in a concentration and time-dependent manner, facilitates mitochondrial proton leak and inhibits the electron transport system. These events were associated with gradual reduction of the mitochondrial membrane potential and mitochondrial ATP synthesis. The intracellular ATP levels further declined as a consequence of PEI-mediated plasma membrane damage and subsequent ATP leakage to the extracellular medium. Studies with freshly isolated mouse liver mitochondria corroborated with bioenergetic findings and demonstrated parallel polycation concentration- and time-dependent changes in state 2 and state 4o oxygen flux as well as lowered ADP phosphorylation (state 3) and mitochondrial ATP synthesis. Polycation-mediated reduction of electron transport system activity was further demonstrated in 'broken mitochondria' (freeze-thawed mitochondrial preparations). Moreover, by using both high-resolution respirometry and spectrophotometry analysis of cytochrome c oxidase activity we were able to identify complex IV (cytochrome c oxidase) as a likely specific site of PEI mediated inhibition within the electron transport system. Unraveling the mechanisms of PEI-mediated mitochondrial energy crisis is central for combinatorial design of safer polymeric non-viral gene delivery systems.
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Affiliation(s)
- Arnaldur Hall
- Centre for Pharmaceutical Nanotechnology and Nanotoxicology, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen Ø, Denmark
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31
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El-Sayed WM, Hussin WA. Antimutagenic and antioxidant activity of novel 4-substituted phenyl-2,2'-bichalcophenes and aza-analogs. Drug Des Devel Ther 2013; 7:73-81. [PMID: 23430305 PMCID: PMC3573810 DOI: 10.2147/dddt.s40129] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Indexed: 11/23/2022]
Abstract
Evaluation of the potential antimutagenic activities of new compounds by Ames assay has been of great interest for the development of novel therapeutics for many diseases including cancer. Ten novel bichalcophenes with in vitro and in vivo broad spectrum activities against various microbial strains were investigated throughout the present study for their cytotoxic, antioxidant, and antimutagenic potential in a Salmonella reverse mutation assay system against sodium azide (NaN(3)) and benzo[a]pyrene (B[a]P). At nontoxic concentrations, all bichalcophenes alone or in combination with NaN(3) (1 μg/plate) or B[a]P (20 μM) with S9 mix were not mutagenic. The bichalcophenes significantly reduced NaN(3)- and B[a]P-induced mutagenicity under pre-exposure and co-exposure conditions in a concentration-independent manner. However, the antimutagenic activity of bichalcophenes against B[a]P varied depending on the exposure regimen, being more effective under pre-exposure conditions. The antimutagenic activity was correlated with a high antioxidant activity that could promote the DNA repair system. Bichalcophenes are least likely to interfere with the microsomal bioactivation of B[a]P. Monocationic bichalcophenes were superior to the corresponding mononitriles as antimutagenic agents against both mutagens investigated, possibly due to the higher nucleophilic centers they have which could bind and protect the bacterial DNA. Three monocationic compounds were shown to have a strong anticancer activity against the 58 cell line. Based on the results of the present investigation, monocationic compounds (1, 4, and 5B) will be selected for further time consuming and costly chemoprevention studies in animal models.
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Affiliation(s)
- Wael M El-Sayed
- King Faisal University, Faculty of Science, Departments of Biological Sciences and Chemistry, Al-Hufof, Ahsa, Kingdom of Saudi Arabia
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32
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Huang L, St. Denis TG, Xuan Y, Huang YY, Tanaka M, Zadlo A, Sarna T, Hamblin MR. Paradoxical potentiation of methylene blue-mediated antimicrobial photodynamic inactivation by sodium azide: role of ambient oxygen and azide radicals. Free Radic Biol Med 2012; 53:2062-71. [PMID: 23044264 PMCID: PMC3522421 DOI: 10.1016/j.freeradbiomed.2012.09.006] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2012] [Revised: 08/01/2012] [Accepted: 09/10/2012] [Indexed: 11/28/2022]
Abstract
Sodium azide (NaN(3)) is widely employed to quench singlet oxygen during photodynamic therapy (PDT), especially when PDT is used to kill bacteria in suspension. We observed that addition of NaN(3) (100 μM or 10 mM) to gram-positive Staphylococcus aureus and gram-negative Escherichia coli incubated with methylene blue (MB) and illuminated with red light gave significantly increased bacterial killing (1-3 logs), rather than the expected protection from killing. A different antibacterial photosensitizer, the conjugate between polyethylenimine and chlorin(e6) (PEI-ce6), showed reduced PDT killing (1-2 logs) after addition of 10mM NaN(3). Azide (0.5mM) potentiated bacterial killing by Fenton reagent (hydrogen peroxide and ferrous sulfate) by up to 3 logs, but protected against killing mediated by sodium hypochlorite and hydrogen peroxide (considered to be a chemical source of singlet oxygen). The intermediacy of N(3)() was confirmed by spin-trapping and electron spin resonance studies in both MB-photosensitized reactions and Fenton reagent with addition of NaN(3). We found that N(3)() was formed and bacteria were killed even in the absence of oxygen, suggesting the direct one-electron oxidation of azide anion by photoexcited MB. This observation suggests a possible mechanism to carry out oxygen-independent PDT.
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Affiliation(s)
- Liyi Huang
- Department of Infectious Diseases, First Affiliated College & Hospital, Guangxi Medical University, Nanning, China 530021
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Dermatology, Harvard Medical School, Boston, MA 02115, USA
| | - Tyler G St. Denis
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Columbia University, New York, NY, USA
| | - Yi Xuan
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- School of Engineering, Tufts University, Medford, MA 02155, USA
| | - Ying-Ying Huang
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Dermatology, Harvard Medical School, Boston, MA 02115, USA
- Department of Pathology, Guangxi Medical University, Nanning, Guangxi, China
| | - Masamitsu Tanaka
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Dermatology, Harvard Medical School, Boston, MA 02115, USA
- Department of Pathology, Guangxi Medical University, Nanning, Guangxi, China
| | - Andrzej Zadlo
- Department of Orthopaedic Surgery, National Defense Medical College, Tokorozawa, Japan 359-8513
| | - Tadeusz Sarna
- Department of Orthopaedic Surgery, National Defense Medical College, Tokorozawa, Japan 359-8513
| | - Michael R. Hamblin
- Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA
- Department of Dermatology, Harvard Medical School, Boston, MA 02115, USA
- Department of Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Krakow, Poland
- Harvard–MIT Division of Health Sciences and Technology, Cambridge, MA 02139, USA
- Corresponding author. Address: Wellman Center for Photomedicine, Massachusetts General Hospital, 40 Blossom Street, Boston, MA 02114, USA. Fax: +1 617 726 8566. (M.R. Hamblin)
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Walash MI, Rizk M, Sheribah ZA, Salim MM. Kinetic spectrophotometric determination of biotin in pharmaceutical preparations. Int J Biomed Sci 2008; 4:238-44. [PMID: 23675096 PMCID: PMC3614710] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2008] [Accepted: 08/17/2008] [Indexed: 12/03/2022]
Abstract
A simple accurate kinetic spectrophotometric method was developed for the determination of biotin in pure form and pharmaceutical preparations. The proposed method is based on a catalytic acceleration of biotin on the reaction between sodium azide and tri-iodide in an aqueous solution. Concentration range of 4-16 μg/mL for biotin was determined by measuring the decrease in the absorbance of tri-iodide at 348 nm by a fixed time method. The decrease in absorbance after 14 min from the initiation of the reaction was markedly correlated to the concentration with correlation coefficient of 0.9999. The detection limit (LOD) of biotin was 0.18 μg/mL while quantitation limit (LOQ) was 0.54 μg/mL. The percentage recovery of the spiked samples was 100.08 ± 0.761. The proposed procedure was successfully applied for the determination of biotin in its pharmaceutical preparations with mean recoveries of 101.17 ± 2.05 and 97.87 ± 1.50 for biotin ampoules and capsules, respectively. The results obtained were in good agreement with those obtained using official method.
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Affiliation(s)
- M I Walash
- Analytical Chemistry Department, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
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Bailleul-Winslett PA, Newnam GP, Wegrzyn RD, Chernoff YO. An antiprion effect of the anticytoskeletal drug latrunculin A in yeast. Gene Expr 2000; 9:145-56. [PMID: 11243411 PMCID: PMC5964936 DOI: 10.3727/000000001783992650] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [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] [Revised: 09/07/2000] [Accepted: 09/18/2000] [Indexed: 11/24/2022]
Abstract
Prions are infectious aggregation-prone isoforms of the normal proteins, supposedly able to seed aggregation of the normal cellular counterparts. In vitro, prion proteins form amyloid fibers, resembling cytoskeletal structures. Yeast prion [PSI], which is a cytoplasmically inherited aggregated isoform of the translation termination factor Sup35p (eRF3), serves as a useful model for studying mechanisms of prion diseases and other amyloidoses. The previously described interaction between Sup35p and cytoskeletal assembly protein Sla1p points to the possible relationships between prions and cytoskeletal networks. Although the Sup35PSI+ aggregates do not colocalize with actin patches, we have shown that yeast cells are efficiently cured of the [PSI] prion by prolonged incubation with latrunculin A, a drug disrupting the actin cytoskeleton. On the other hand, treatments with sodium azide or cycloheximide, agents blocking yeast protein synthesis and cell proliferation but not disrupting the cytoskeleton, do not cause a significant loss of [PSI]. Moreover, simultaneous treatment with sodium azide or cycloheximide blocks [PSI] curing by latrunculin A, indicating that prion loss in the presence of latrunculin A requires a continuation of protein synthesis during cytoskeleton disruption. The sodium azide treatment also decreases the toxic effect of latrunculin A. Latrunculin A influences neither the levels of total cellular Sup35p nor the levels of chaperone proteins, such as Hsp104 and Hsp70, which were previously shown to affect [PSI]. This makes an indirect effect of latrunculin A on [PSI] via induction of Hsps unlikely. Fluorescence microscopy detects changes in the structure and/or localization of the Sup35PSI+ aggregates in latrunculin A-treated cells. We conclude that the stable maintenance of the [PSI] prion aggregates in the protein-synthesizing yeast cells partly depends on an intact actin cytoskeleton, suggesting that anticytoskeletal treatments could be used to counteract some aggregation-related disorders.
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Affiliation(s)
- Peggy A. Bailleul-Winslett
- School of Biology and Institute for Bioengineering and Bioscience, Georgia Institute of Technology, M/C 0363, Atlanta, GA 30332-0363
| | - Gary P. Newnam
- School of Biology and Institute for Bioengineering and Bioscience, Georgia Institute of Technology, M/C 0363, Atlanta, GA 30332-0363
| | - Renee D. Wegrzyn
- School of Biology and Institute for Bioengineering and Bioscience, Georgia Institute of Technology, M/C 0363, Atlanta, GA 30332-0363
| | - Yury O. Chernoff
- School of Biology and Institute for Bioengineering and Bioscience, Georgia Institute of Technology, M/C 0363, Atlanta, GA 30332-0363
- Address correspondence to Yury O. Chernoff, Institute for Bioengineering and Bioscience, Georgia Institute of Technology, 315 Ferst Drive, Atlanta, GA 30332-0363. Tel: (404) 894-1157; Fax: (404) 894-0519, (404) 894-2291; E-mail:
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Arnold WP, Mittal CK, Katsuki S, Murad F. Nitric oxide activates guanylate cyclase and increases guanosine 3':5'-cyclic monophosphate levels in various tissue preparations. Proc Natl Acad Sci U S A 1977; 74:3203-7. [PMID: 20623 PMCID: PMC431498 DOI: 10.1073/pnas.74.8.3203] [Citation(s) in RCA: 911] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Nitric oxide gas (NO) increased guanylate cyclase [GTP pyrophosphate-lyase (cyclizing), EC 4.6.1.2] activity in soluble and particulate preparations from various tissues. The effect was dose-dependent and was observed with all tissue preparations examined. The extent of activation was variable among different tissue preparations and was greatest (19- to 33-fold) with supernatant fractions of homogenates from liver, lung, tracheal smooth muscle, heart, kidney, cerebral cortex, and cerebellum. Smaller effects (5- to 14-fold) were observed with supernatant fractions from skeletal muscle, spleen, intestinal muscle, adrenal, and epididymal fat. Activation was also observed with partially purified preparations of guanylate cyclase. Activation of rat liver supernatant preparations was augmented slightly with reducing agents, decreased with some oxidizing agents, and greater in a nitrogen than in an oxygen atmosphere. After activation with NO, guanylate cyclase activity decreased with a half-life of 3-4 at 4 degrees but re-exposure to NO resulted in reactivation of preparations. Sodium azide, sodium nitrite, hydroxylamine, and sodium nitroprusside also increased guanylate cyclase activity as reported previously. NO alone and in combination with these agents produced approximately the same degree of maximal activation, suggesting that all of these agents act through a similar mechanism. NO also increased the accumulation of cyclic GMP but not cyclic AMP in incubations of minces from various rat tissues. We propose that various nitro compounds and those capable of forming NO in incubations activate guanylate cyclase through a similar but undefined mechanism. These effects may explain the high activities of guanylate cyclase in certain tissues (e.g., lung and intestinal mucosa) that are exposed to environmental nitro compounds.
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