1
|
Kanzouai Y, Laghmari M, Yamari I, Bouzammit R, Bahsis L, Benali T, Chtita S, Bakhouch M, Akhazzane M, El Kouali M, Hammani K, Al Houari G. Chromone-isoxazole hybrids molecules: synthesis, spectroscopic, MEDT, ELF, antibacterial, ADME-Tox, molecular docking and MD simulation investigations. J Biomol Struct Dyn 2023:1-15. [PMID: 37817499 DOI: 10.1080/07391102.2023.2266022] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 04/15/2023] [Accepted: 07/01/2023] [Indexed: 10/12/2023]
Abstract
A mechanistic study was performed within the molecular electron density theory at the B3LYP/6-311G (d,p) computational level to explain the regioselectivity observed. An electron localization function analysis was also performed, and the results confirm the zwitterionic-type (zw-type) mechanism of the cycloaddition reactions between nitrile oxide and alkylated 4H-chromene-2-carboxylate derivatives and shed more light on the obtained regioselectivity experimentally. In silico studies on the pharmacokinetics, ADME and toxicity tests of the compounds were also performed, and it was projected that compounds 5a, 5b, 5c and 5d are pharmacokinetic and have favorable ADME profiles. Moreover, docking and molecular dynamics investigations were conducted to evaluate the interactions, orientation and conformation of the target compounds on the active sites of four distinct enzymes. The results of this investigation showed that two compounds, 5a and 5c, interacted effectively with the S. aureus active site while maintaining acceptable binding energy.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Youssra Kanzouai
- Engineering Laboratory of Organometallic and Molecular Materials and Environment, Department of Chemistry, Faculty of Sciences Dhar El Mahraz, University of Sidi Mohamed Ben Abdellah, Fez, Morocco
| | - Mustapha Laghmari
- Laboratory of Natural Resources and Environment, Department of Biology Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University, Taza, Morocco
| | - Imane Yamari
- Laboratory of Analytical and Molecular Chemistry, Department of Chemistry, Faculty of Sciences Ben M'Sik, Hassan II University of Casablanca, Casablanca, Morocco
| | - Rachid Bouzammit
- Engineering Laboratory of Organometallic and Molecular Materials and Environment, Department of Chemistry, Faculty of Sciences Dhar El Mahraz, University of Sidi Mohamed Ben Abdellah, Fez, Morocco
| | - Lahoucine Bahsis
- Laboratoire de Chimie Analytique et Moléculaire, LCAM, Département de Chimie, Faculté Polydisciplinaire de Safi, Université Cadi Ayyad, Safi, Morocco
| | - Taoufiq Benali
- Laboratory of Natural Resources and Environment, Department of Biology Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University, Taza, Morocco
- Environment and Health Team, Polydisciplinary Faculty of Safi, Department of Biology, Cadi Ayyad University, Safi, Morocco
| | - Samir Chtita
- Laboratory of Analytical and Molecular Chemistry, Department of Chemistry, Faculty of Sciences Ben M'Sik, Hassan II University of Casablanca, Casablanca, Morocco
| | - Mohamed Bakhouch
- Bioorganic Chemistry Team, Department of Chemistry, Faculty of Sciences, University Chouaïb Doukkali, El Jadida, Morocco
| | - Mohamed Akhazzane
- Cité de l'innovation, Université Sidi Mohamed Ben Abdellah, Fez, Morocco
| | - M'hammed El Kouali
- Laboratory of Analytical and Molecular Chemistry, Department of Chemistry, Faculty of Sciences Ben M'Sik, Hassan II University of Casablanca, Casablanca, Morocco
| | - Khalil Hammani
- Laboratory of Natural Resources and Environment, Department of Biology Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University, Taza, Morocco
| | - Ghali Al Houari
- Engineering Laboratory of Organometallic and Molecular Materials and Environment, Department of Chemistry, Faculty of Sciences Dhar El Mahraz, University of Sidi Mohamed Ben Abdellah, Fez, Morocco
| |
Collapse
|
2
|
Harboul K, El Aabedy A, Hammani K, El-Karkouri A. Reduction of hexavalent chromium using Bacillus safensis isolated from an abandoned mine. Environ Technol 2023:1-17. [PMID: 37671659 DOI: 10.1080/09593330.2023.2256457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/07/2023]
Abstract
The present work focused on the isolation of a bacterial strain multi-resistant to heavy metals with a high potential for reducing hexavalent chromium (Cr(VI)) and studied its Cr(VI) removal performance in immobilized state and the mechanisms involved. Bacterial isolate was identified as Bacillus safensis CCMM B629 (B. safensis), is able to completely reduce 50, 100 and 200 mg/L of Cr(VI) after 24, 48 and 120 h, respectively under optimized conditions of pH 7 and 30°C. The coexistence of nitrates, cadmium and mercury inhibits reduction, while copper and iron significantly improve removal efficiencies. Additionally, the presence of electron donors such as glycerol, glucose and citrate significantly increases bioreduction rate. Cells immobilized in alginate beads successfully reduced Cr(VI) compared to free cells, showing the performance of biobeads in Cr(VI) reduction. Membrane fraction exhibited highest rate of Cr(VI) reduction (65%) compared to other cellular components, indicating that Cr(VI) reduction occurred primarily in cell membrane. Further characterization of Cr(VI) removal by B. safensis cells using scanning electron microscopy and energy-dispersive X-ray (SEM-EDX) analysis showed its ability to reduce and adsorb Cr(VI), confirming that hexavalent chromium was taken up successfully on bacterial cell surfaces. Based on Fourier transform infrared spectroscopy analysis (FTIR), hydroxyl, carboxyl, amide, and phosphoryl functional groups participated in combination with Cr(III). In conclusion, B. safensis is a bacterium with great potential for Cr(VI) removal, and it is a promising and competitive strain for use in bioremediation of Cr(VI) contaminated industrial effluents.
Collapse
Affiliation(s)
- Kaoutar Harboul
- Natural Resources and Environment Laboratory, Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University, Fez, Morocco
| | - Amal El Aabedy
- Laboratory of Microbial Biotechnology and Bioactive Molecules, Sciences and Technologies Faculty, Sidi Mohamed Ben Abdellah University, Fez, Morocco
| | - Khalil Hammani
- Natural Resources and Environment Laboratory, Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University, Fez, Morocco
| | - Abdenbi El-Karkouri
- Biotechnology, Environment, Agri-Food and Health Laboratory, Faculty of Sciences Dhar el Mahraz, Sidi Mohamed Ben Abdellah University, Fez, Morocco
| |
Collapse
|
3
|
Benali T, Lemhadri A, Harboul K, Chtibi H, Khabbach A, Jadouali SM, Quesada-Romero L, Louahlia S, Hammani K, Ghaleb A, Lee LH, Bouyahya A, Rusu ME, Akhazzane M. Chemical Profiling and Biological Properties of Essential Oils of Lavandula stoechas L. Collected from Three Moroccan Sites: In Vitro and In Silico Investigations. Plants (Basel) 2023; 12:1413. [PMID: 36987101 PMCID: PMC10057000 DOI: 10.3390/plants12061413] [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: 02/16/2023] [Revised: 03/14/2023] [Accepted: 03/20/2023] [Indexed: 06/19/2023]
Abstract
The aim of this study was the determination of the chemical compounds of Lavandula stoechas essential oil from Aknol (LSEOA), Khenifra (LSEOK), and Beni Mellal (LSEOB), and the in vitro investigation of their antibacterial, anticandidal, and antioxidant effects, and in silico anti-SARS-CoV-2 activity. The chemical profile of LSEO was determined using GC-MS-MS analysis, the results of which showed a qualitative and quantitative variation in the chemical composition of volatile compounds including L-fenchone, cubebol, camphor, bornyl acetate, and τ-muurolol; indicating that the biosynthesis of essential oils of Lavandula stoechas (LSEO) varied depending on the site of growth. The antioxidant activity was evaluated using the ABTS and FRAP methods, our results showed that this tested oil is endowed with an ABTS inhibitory effect and an important reducing power which varies between 4.82 ± 1.52 and 15.73 ± 3.26 mg EAA/g extract. The results of antibacterial activity of LSEOA, LSEOK and LSEOB, tested against Gram-positive and Gram-negative bacteria, revealed that B. subtilis (20.66 ± 1.15-25 ± 4.35 mm), P. mirabilis (18.66 ± 1.15-18.66 ± 1.15 mm), and P. aeruginosa (13.33 ± 1.15-19 ± 1.00 mm) are the most susceptible strains to LSEOA, LSEOK and LSEOB of which LSEOB exhibits bactericidal effect against P. mirabilis. furthermore The LSEO exhibited varying degrees of anticandidal activity with an inhibition zones of 25.33 ± 0.5, 22.66 ± 2.51, and 19 ± 1 mm for LSEOK, LSEOB, and LSEOA, respectively. Additionally, the in silico molecular docking process, performed using Chimera Vina and Surflex-Dock programs, indicated that LSEO could inhibit SARS-CoV-2. These important biological properties of LSEO qualify this plant as an interesting source of natural bioactive compounds with medicinal actions.
Collapse
Affiliation(s)
- Taoufiq Benali
- Environment and Health Team, Polydisciplinary Faculty of Safi, Cadi Ayyad University, Marrakech 46030, Morocco
- Laboratory of Natural Resources and Environment, Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University of Fez, B.P. 1223 Taza-Gare, Taza 30050, Morocco
| | - Ahmed Lemhadri
- Environment and Health Team, Polydisciplinary Faculty of Safi, Cadi Ayyad University, Marrakech 46030, Morocco
| | - Kaoutar Harboul
- Laboratory of Natural Resources and Environment, Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University of Fez, B.P. 1223 Taza-Gare, Taza 30050, Morocco
| | - Houda Chtibi
- Laboratory of Natural Resources and Environment, Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University of Fez, B.P. 1223 Taza-Gare, Taza 30050, Morocco
| | - Abdelmajid Khabbach
- Laboratory of Biotechnology, Conservation and Valorisation of Natural Resources (BCVRN), Faculty of Sciences Dhar El Mahraz, Sidi Mohamed Ben Abdellah University, B.P. 1796, Fez 30003, Morocco
| | - Si Mohamed Jadouali
- Department of Biotechnology and Analysis EST Khenifra, Sultan Moulay Sliman University, Khenifra 23000, Morocco
| | - Luisa Quesada-Romero
- Escuela de Nutrición y Dietética, Facultad de Ciencias Para el Cuidado de la Salud, Universidad San Sebastián, General Lagos 1163, Valdivia 5090000, Chile
| | - Said Louahlia
- Laboratory of Natural Resources and Environment, Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University of Fez, B.P. 1223 Taza-Gare, Taza 30050, Morocco
| | - Khalil Hammani
- Laboratory of Natural Resources and Environment, Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University of Fez, B.P. 1223 Taza-Gare, Taza 30050, Morocco
| | - Adib Ghaleb
- Laboratory of Analytical and Molecular Chemistry, Multidisciplinary Faculty of Safi, Cadi Ayyad University, Safi 46030, Morocco
| | - Learn-Han Lee
- Novel Bacteria and Drug Discovery Research Group (NBDD), Microbiome and Bioresource Research Strength (MBRS), Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia, Bandar Sunway, Subang Jaya 47500, Malaysia
| | - Abdelhakim Bouyahya
- Laboratory of Human Pathologies Biology, Department of Biology, Faculty of Sciences, Mohammed V University, Rabat 10100, Morocco
| | - Marius Emil Rusu
- Department of Pharmaceutical Technology and Biopharmaceutics, Faculty of Pharmacy, Iuliu Hatieganu University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
| | - Mohamed Akhazzane
- Engineering Laboratory of Organometallic and Molecular Materials and Environment, Faculty of Sciences Dhar El Mahraz, Sidi Mohamed Ben Abdellah University, Fez 30000, Morocco
| |
Collapse
|
4
|
Benali T, Bouyahya A, Habbadi K, Zengin G, Khabbach A, Achbani EH, Hammani K. Chemical composition and antibacterial activity of the essential oil and extracts of Cistus ladaniferus subsp. ladanifer and Mentha suaveolens against phytopathogenic bacteria and their ecofriendly management of phytopathogenic bacteria. Biocatalysis and Agricultural Biotechnology 2020. [DOI: 10.1016/j.bcab.2020.101696] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
|
5
|
Benali T, Habbadi K, Khabbach A, Marmouzi I, Zengin G, Bouyahya A, Chamkhi I, Chtibi H, Aanniz T, Achbani EH, Hammani K. GC-MS Analysis, Antioxidant and Antimicrobial Activities of Achillea Odorata Subsp. Pectinata and Ruta Montana Essential Oils and Their Potential Use as Food Preservatives. Foods 2020; 9:foods9050668. [PMID: 32455872 PMCID: PMC7278837 DOI: 10.3390/foods9050668] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 05/13/2020] [Accepted: 05/20/2020] [Indexed: 12/16/2022] Open
Abstract
In order to discover new natural resources with biological properties, the chemical composition, the antioxidant and antimicrobial activities, and the potential use as food preservative of essential oils of Moroccan Achillea odorata subsp. pectinata (AOpEO) and Ruta montana (RMEO) were studied. Gas chromatography-mass spectrometry (GC-MS) analysis revealed the presence of 21 and 25 compounds in AOpEO and RMEO, respectively. The results showed that the major compounds of AOpEO are camphor (45.01%), bornyl acetate (15.07%), borneol (11.33%), β-eudesmol (4.74%), camphene (3.58%), and 1.8-cineole (eucalyptol) (2.96%), whereas 2-undecanone (63.97%), camphor (3.82%) and cyclopropanecarboxylic acid (3.66%) were the main components of RMEO. The antioxidant activities were evaluated by diphenylpicrylhydraziyl radical (DPPH) and reducing power assays. The antimicrobial activities of essential oils were tested against bacterial strains and food contaminant yeast using agar disc diffusion and microdilution methods. A significant antimicrobial activity of AOpEO was observed against Bacillus subtilis, Proteus mirabilis and Candida albicans, compared to RMEO. The efficacy of AOpEO was also evaluated in model food systems (cabbage and barley) artificially inoculated during storage. The results found that the adding of a minimal inhibitory concentration (MIC) and 4× MIC were potent in decreasing the Proteus mirabilis growth in food model systems. Our findings suggested that AOpEO may be potentially used as an alternative food preservative.
Collapse
Affiliation(s)
- Taoufiq Benali
- Laboratory of Natural Resources and Environment, Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University of Fez, B.P. 1223 Taza-Gare, Taza, Morocco; (H.C.); (K.H.)
- Correspondence: ; Tel.: +212-660-719-519
| | - Khaoula Habbadi
- Laboratoire de recherche et de protection des plantes URPP-INRA-Meknès, 50000 Meknès, Morocco; (K.H.); (E.H.A.)
| | - Abdelmajid Khabbach
- Laboratory of materials, natural substances, Environment and Modeling (LMSNEM), Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University of Fez, B.P. 1223 Taza-Gare, Taza, Morocco;
| | - Ilias Marmouzi
- Laboratory of de Pharmacology et Toxicology, Faculty of Medicine and Pharmacy, University Mohammed V in Rabat, BP 6203, Rabat Instituts, Rabat, 6203 Rabat, Morocco;
| | - Gokhan Zengin
- Biochemistry and Physiology Laboratory, Faculty of Science, Department of Biology, Selcuk University, 42130 Konya, Turkey;
| | - Abdelhakim Bouyahya
- Laboratory of Human Pathologies Biology, Faculty of Sciences, and Genomic Center of Human Pathologies, Faculty of Medicine and Pharmacy, Department of Biology, Mohammed V University in Rabat, 1014 Rabat, Morocco;
| | - Imane Chamkhi
- Microbiology and Molecular Biology Team, Center of Plant and Microbial Biotechnology, Biodiversity and Environment, Faculty of Sciences, Mohammed V University, Rabat, 1014 Rabat, Morocco;
| | - Houda Chtibi
- Laboratory of Natural Resources and Environment, Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University of Fez, B.P. 1223 Taza-Gare, Taza, Morocco; (H.C.); (K.H.)
| | - Tarik Aanniz
- Medical Biotechnology Laboratory (MedBiotech), Rabat Medical & Pharmacy School, Mohammed V University in Rabat, 6203 Rabat, Morocco;
| | - El Hassan Achbani
- Laboratoire de recherche et de protection des plantes URPP-INRA-Meknès, 50000 Meknès, Morocco; (K.H.); (E.H.A.)
| | - Khalil Hammani
- Laboratory of Natural Resources and Environment, Polydisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University of Fez, B.P. 1223 Taza-Gare, Taza, Morocco; (H.C.); (K.H.)
| |
Collapse
|
6
|
Ettamimi S, Carlier JD, Cox CJ, Elamine Y, Hammani K, Ghazal H, Costa MC. A meta-taxonomic investigation of the prokaryotic diversity of water bodies impacted by acid mine drainage from the São Domingos mine in southern Portugal. Extremophiles 2019; 23:821-834. [PMID: 31598797 DOI: 10.1007/s00792-019-01136-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 06/16/2019] [Accepted: 09/23/2019] [Indexed: 11/30/2022]
Abstract
The prokaryotic communities of water bodies contaminated by acid mine drainage from the São Domingos mining area in southern Portugal were analyzed using a meta-taxonomics approach with 16S rRNA gene sequences. Samples were collected in two seasonal sampling campaigns (summer and winter of 2017) from the most contaminated sites from where the water flows downstream to the freshwater reservoir of the river Chança. The physicochemical data indicate a trend of decreasing acid mine drainage contamination downstream of the mining area to the Chança's reservoir. The most contaminated sites (pH = 2.3-3.1) are distinguished by prokaryotic diversity with high abundances of operational taxonomics units related to acidophiles (genera Metallibacterium, Acidibacter, Leptospirillum, Acidobacterium, Thiomonas, Acidicapsa, Acidocella, Acidiphilium; family Acidobacteriaceae, order CPla-3 termite group). Likewise, in the transition zone in the mouth of the contaminated water flow into the Chança´s reservoir (pH = 6.4), a specific prokaryotic flora exists with some acidophiles, but notably with a cyanobacteria bloom and a high abundance of the genus Sediminibacterium (family I; order Subsection III). Moreover, the strong correlation between the abundance of acidophiles and characteristic physiochemical parameters (metals, acidity, and sulfate) confirm their potential as biomarkers of acid mine drainage pollution.
Collapse
Affiliation(s)
- Sara Ettamimi
- Natural Resources and Environment Laboratory, Sidi Mohammed Ben Abdellah University, Polydisciplinary Faculty of Taza, Taza, Morocco
| | - Jorge D Carlier
- Centre of Marine Sciences (CCMAR), Gambelas Campus, University of the Algarve, 8005-139, Faro, Portugal.
| | - Cymon J Cox
- Centre of Marine Sciences (CCMAR), Gambelas Campus, University of the Algarve, 8005-139, Faro, Portugal
| | - Youssef Elamine
- Laboratory of Physiology-Pharmacology and Environmental Health, Faculty of Sciences, Sidi Mohammed Ben Abdellah University, Dhar El Mehraz, Fez, Morocco
| | - Khalil Hammani
- Natural Resources and Environment Laboratory, Sidi Mohammed Ben Abdellah University, Polydisciplinary Faculty of Taza, Taza, Morocco
| | - Hassan Ghazal
- Laboratory of Physiology and Genetics, Faculty of Sciences, University Mohammed Premier, Oujda, Morocco
| | - Maria C Costa
- Centre of Marine Sciences (CCMAR), Gambelas Campus, University of the Algarve, 8005-139, Faro, Portugal
- Faculty of Sciences and Technologies, Gambelas Campus, University of the Algarve, 8005-139, Faro, Portugal
| |
Collapse
|
7
|
Weeber JC, Arocas J, Heintz O, Markey L, Viarbitskaya S, Colas-des-Francs G, Hammani K, Dereux A, Hoessbacher C, Koch U, Leuthold J, Rohracher K, Giesecke AL, Porschatis C, Wahlbrink T, Chmielak B, Pleros N, Tsiokos D. Characterization of CMOS metal based dielectric loaded surface plasmon waveguides at telecom wavelengths. Opt Express 2017; 25:394-408. [PMID: 28085833 DOI: 10.1364/oe.25.000394] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Dielectric loaded surface plasmon waveguides (DLSPPWs) comprised of polymer ridges deposited on top of CMOS compatible metal thin films are investigated at telecom wavelengths. We perform a direct comparison of the properties of copper (Cu), aluminum (Al), titanium nitride (TiN) and gold (Au) based waveguides by implementing the same plasmonic waveguiding configuration for each metal. The DLSPPWs are characterized by leakage radiation microscopy and a fiber-to-fiber configuration mimicking the cut-back method. We introduce the ohmic loss rate (OLR) to analyze quantitatively the properties of the CMOS metal based DLSPPWs relative to the corresponding Au based waveguides. We show that the Cu, Al and TiN based waveguides feature extra ohmic loss compared to Au of 0.027 dB/μm, 0.18 dB/μm and 0.52 dB/μm at 1550nm respectively. The dielectric function of each metal extracted from ellipsometric spectroscopic measurements is used to model the properties of the DLSP-PWs. We find a fairly good agreement between experimental and modeled DLSPPWs properties except for Al featuring a large surface roughness. Finally, we conclude that TiN based waveguides sustaining intermediate effective index (in the range 1.05-1.25) plasmon modes propagate over very short distances restricting the the use of those modes in practical situations.
Collapse
|
8
|
Hammani K, Finot C, Habert R, Mussot A, Kudlinski A. Active reduction of fluctuations in fourth-order modulation instability. Opt Lett 2012; 37:4305-4307. [PMID: 23073445 DOI: 10.1364/ol.37.004305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We experimentally study the fluctuation properties of a scalar fourth-order modulation instability (MI) process obtained by pumping a photonic crystal fiber in the normal dispersion region. We observe large wavelength-dependent pulse-to-pulse fluctuations that cannot be significantly reduced by stimulating the process with a single seed. Their reduction requires two seeds slightly detuned from the maximum gain frequency in order to also stimulate the second-order MI process cascaded from the fourth-order one. This concept is validated by experiments and numerical simulations.
Collapse
Affiliation(s)
- K Hammani
- Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, Dijon, France
| | | | | | | | | |
Collapse
|
9
|
Hammani K, Wetzel B, Kibler B, Fatome J, Finot C, Millot G, Akhmediev N, Dudley JM. Spectral dynamics of modulation instability described using Akhmediev breather theory. Opt Lett 2011; 36:2140-2142. [PMID: 21633475 DOI: 10.1364/ol.36.002140] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The Akhmediev breather formalism of modulation instability is extended to describe the spectral dynamics of induced multiple sideband generation from a modulated continuous wave field. Exact theoretical results describing the frequency domain evolution are compared with experiments performed using single mode fiber around 1550 nm. The spectral theory is shown to reproduce the depletion dynamics of an injected modulated continuous wave pump and to describe the Fermi-Pasta-Ulam recurrence and recovery towards the initial state. Realistic simulations including higher-order dispersion, loss, and Raman scattering are used to identify that the primary physical factors that preclude perfect recurrence are related to imperfect initial conditions.
Collapse
Affiliation(s)
- K Hammani
- Laboratoire Interdisciplinaire Carnot de Bourgogne, CNRS-Université de Bourgogne UMR 5209, 21078 Dijon, France
| | | | | | | | | | | | | | | |
Collapse
|
10
|
Wetzel B, Erkintalo M, Genty G, Dias F, Hammani K, Kibler B, Fatome J, Finot C, Millot G, Akhmediev N, Dudley JM. Analytical studies of modulation instability and nonlinear compression dynamics in optical fiber propagation. ACTA ACUST UNITED AC 2011. [DOI: 10.1117/12.887455] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
|
11
|
Zhong ZD, Hammani K, Bae WS, DeClerck YA. NF-Y and Sp1 cooperate for the transcriptional activation and cAMP response of human tissue inhibitor of metalloproteinases-2. J Biol Chem 2000; 275:18602-10. [PMID: 10764764 DOI: 10.1074/jbc.m001389200] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The balance between matrix metalloproteinases (MMPs) and tissue inhibitors of MMPs (TIMPs) is a key determinant in the homeostasis of the extracellular matrix. We have identified two cis-acting elements involved in the transcriptional regulation of TIMP-2. The first is an inverted CCAAT box located at position -73 to -69 in the TIMP-2 promoter that binds the transcription factor NF-Y. The second is a GAGGAGGGGG motif located at position -107 to -98, that binds the transcription factors Sp1 and Sp3. NF-Y and Sp1 cooperate for the basal transcription activity of the promoter. We then determined that TIMP-2 is transcriptionally up-regulated by cAMP analogs. Up-regulation of TIMP-2 by dibutyryl cAMP is a delayed response that requires de novo protein synthesis and does not affect RNA stability. The NF-Y and the Sp1 binding site are both involved in cAMP-dependent up-regulation of TIMP-2. Whereas NF-Y is essential for cAMP mediated regulation, Sp1 alone is not sufficient but enhances the activity of NF-Y. Dibutyryl cAMP has no effect on the expression of MMP-2 and MMP-9 and switches the MMP-TIMP balance in favor of the inhibitor.
Collapse
Affiliation(s)
- Z D Zhong
- Division of Hematology-Oncology, Department of Pediatrics, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, California 90027, USA
| | | | | | | |
Collapse
|
12
|
Peeters-Joris C, Hammani K, Singer CF. Differential regulation of MMP-13 (collagenase-3) and MMP-3 (stromelysin-1) in mouse calvariae. Biochim Biophys Acta 1998; 1405:14-28. [PMID: 9784593 DOI: 10.1016/s0167-4889(98)00094-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Bone resorption in mice involves the degradation of extracellular matrix. Whereas several proteases seem to be implicated in this process, it becomes increasingly clear that matrix metalloproteinases (MMPs), amongst them especially MMP-13 and MMP-3, play an essential role. We have purified MMP-13 and MMP-3 from mouse calvariae-conditioned media by differential fractionation and analyzed their collagenolytic, caseinolytic, gelatinolytic and proteoglycanolytic activities. It could be shown that in mouse calvariae-conditioned media most of the measured enzyme activities were due to MMP-13, although zymographies revealed that MMP-3, MMP-2, MMP-9 as well as TIMPs were present too. MMP-13 and MMP-3 proteins were detected and their enzyme activities were neutralized by specific polyclonal antisera. Furthermore, it was demonstrated that in cultures of mouse calvariae the production of MMP-13 was induced by the potent MMP-stimulator heparin and by parathyroid hormone (PTH), whereas the levels of MMP-3 remained unchanged. Although PTH-induced bone resorption was inhibited by calcitonin treatment, MMP-13 mRNA and protein expression were not significantly altered by this hormone. Together with previous observations, these results indicate that PTH regulates bone resorption through MMP-13, but not by MMP-3, and that its reversion by calcitonin involves neither of the two enzymes.
Collapse
Affiliation(s)
- C Peeters-Joris
- Laboratoire de Chimie Physiologique (Connective Tissue Group), Université de Louvain and C. de Duve Institute of Cellular Pathology, Brussels, Belgium.
| | | | | |
Collapse
|
13
|
Hammani K, Blakis A, Morsette D, Bowcock AM, Schmutte C, Henriet P, DeClerck YA. Structure and characterization of the human tissue inhibitor of metalloproteinases-2 gene. J Biol Chem 1996; 271:25498-505. [PMID: 8810321 DOI: 10.1074/jbc.271.41.25498] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
We report here the characterization of the human tissue inhibitor of metalloproteinases-2 (TIMP-2) gene. The gene is 83 kilobase pairs (kb) long with exon-intron splicing sites located in preserved positions among the three members of the TIMP family. A 2.6-kb genomic DNA fragment flanking the 5'-end of the gene contains several regulatory elements including five Sp1, two AP-2, one AP-1, and three PEA-3 binding sites. Despite the presence of a complete AP-1 consensus at position -281, the promoter did not respond to 12-O-tetradecanoylphorbol-13-acetate treatment. However, 12-O-tetradecanoylphorbol-13-acetate response was generated by insertion of a similar AP-1 consensus at position -71, indicating the importance of the positioning of this motif. The promoter contains a typical CpG island; however, methylation of this island did not seem to influence gene expression. Analysis of the 3'-end of the gene revealed that the two mRNAs for TIMP-2 (1.2 and 3.8 kb) differ by the selection of their polyadenylation signal sites, but selection of these sites does not affect RNA stability. In summary, the TIMP-2 gene has several features observed in housekeeping genes, and differs significantly from TIMP-1 and TIMP-3 genes. These differences are likely to explain the specific roles that these inhibitors play in the regulation of matrix metalloproteinases.
Collapse
Affiliation(s)
- K Hammani
- Division of Hematology-Oncology, Department of Pediatrics, Children's Hospital Los Angeles, Los Angeles, California 90054-0700, USA
| | | | | | | | | | | | | |
Collapse
|
14
|
Abstract
Using a cDNA probe, two genomic clones were obtained encoding the human tissue inhibitor of metalloproteinases-3 (TIMP-3). Analysis of these clones showed that they contained four distal exons and three introns of the gene. Although the intron-exon structure is similar to that of the timp1 gene, the first intron of the timp3 gene is much longer, being at least 17.5 kb in size.
Collapse
Affiliation(s)
- K Hammani
- Department of Pediatrics, Childrens Hospital Los Angeles, CA 90054-0700, USA
| | | | | | | |
Collapse
|
15
|
Abstract
A cDNA encoding mouse stromelysin 1 was cloned and the 1740-bp sequence was determined. The deduced amino acid (aa) sequence was compared with stromelysin 1 sequences of other mammals. Comparison with a previously published incomplete aa sequence of mouse stromelysin 1 revealed three single aa differences.
Collapse
Affiliation(s)
- K Hammani
- Laboratoire de Chimie Physiologique (Connective Tissue Group), Université de Louvain, Bruxelles, Belgium
| | | | | |
Collapse
|