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  • 1.
    Mulliri, Simone
    et al.
    Department of Chemical and Geological Sciences, University of Cagliari, Monserrato, I-09042, Italy.
    Laaksonen, Aatto
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap. State Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University, Nanjing, 210009, China; Division of Physical Chemistry, Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, Stockholm, 10691, Sweden; Centre of Advanced Research in Bionanoconjugates and Biopolymers, Petru Poni Institute of Macromolecular Chemistry, Iasi, 700487, Romania.
    Spanu, Pietro
    Istituto di Chimica Biomolecolare, ICB-CNR-Trav, La Crucca 3, Sassari, 07100, Italy.
    Farris, Riccardo
    Department of Chemical and Geological Sciences, University of Cagliari, Monserrato, I-09042, Italy.
    Farci, Matteo
    Department of Chemical and Geological Sciences, University of Cagliari, Monserrato, I-09042, Italy.
    Mingoia, Francesco
    Istituto per lo Studio dei Materiali Nanostrutturati ISMN-CNR, Via U. La Malfa 153, Palermo, I-90146, Italy.
    Roviello, Giovanni
    Istituto di Biostrutture e Bioimmagini, IBB-CNR, Via Mezzocannone 16, Naples, I-80134, Italy.
    Mocci, Francesca
    Department of Chemical and Geological Sciences, University of Cagliari, Monserrato, I-09042, Italy; Centre of Advanced Research in Bionanoconjugates and Biopolymers, Petru Poni Institute of Macromolecular Chemistry, Iasi, 700487, Romania.
    Spectroscopic and In Silico Studies on the Interaction of Substituted Pyrazolo[1,2-a]benzo[1,2,3,4]tetrazine-3-one Derivatives with c-Myc G4-DNA2021Ingår i: International Journal of Molecular Sciences, ISSN 1661-6596, E-ISSN 1422-0067, Vol. 22, nr 11, artikel-id 6028Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Herein we describe a combined experimental and in silico study of the interaction of a series of pyrazolo[1,2-a]benzo[1,2,3,4]tetrazin-3-one derivatives (PBTs) with parallel G-quadruplex (GQ) DNA aimed at correlating their previously reported anticancer activities and the stabilizing effects observed by us on c-myc oncogene promoter GQ structure. Circular dichroism (CD) melting experiments were performed to characterize the effect of the studied PBTs on the GQ thermal stability. CD measurements indicate that two out of the eight compounds under investigation induced a slight stabilizing effect (2–4 °C) on GQ depending on the nature and position of the substituents. Molecular docking results allowed us to verify the modes of interaction of the ligands with the GQ and estimate the binding affinities. The highest binding affinity was observed for ligands with the experimental melting temperatures (Tms). However, both stabilizing and destabilizing ligands showed similar scores, whilst Molecular Dynamics (MD) simulations, performed across a wide range of temperatures on the GQ in water solution, either unliganded or complexed with two model PBT ligands with the opposite effect on the Tms, consistently confirmed their stabilizing or destabilizing ability ascertained by CD. Clues about a relation between the reported anticancer activity of some PBTs and their ability to stabilize the GQ structure of c-myc emerged from our study. Furthermore, Molecular Dynamics simulations at high temperatures are herein proposed for the first time as a means to verify the stabilizing or destabilizing effect of ligands on the GQ, also disclosing predictive potential in GQ-targeting drug discovery. 

  • 2.
    Nikolaivits, Efstratios
    et al.
    Industrial Biotechnology & Biocatalysis Group, Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens, 15780 Athens, Greece.
    Agrafiotis, Andreas
    Industrial Biotechnology & Biocatalysis Group, Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens, 15780 Athens, Greece.
    Baira, Eirini
    Division of Pharmacognosy and Chemistry of Natural Products, Department of Pharmacy, National and Kapodistrian University of Athens, 15771 Athens, Greece.
    Le Goff, Géraldine
    Institut de Chimie des Substances Naturelles, ICSN, CNRS, 91198 Gif sur Yvette, France.
    Tsafantakis, Nikolaos
    Division of Pharmacognosy and Chemistry of Natural Products, Department of Pharmacy, National and Kapodistrian University of Athens, 15771 Athens, Greece.
    Chavanich, Suchana A.
    Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
    Benayahu, Yehuda
    School of Zoology, Faculty of Life Sciences, Tel Aviv University, Tel Aviv 69978, Israel.
    Ouazzani, Jamal
    Institut de Chimie des Substances Naturelles, ICSN, CNRS, 91198 Gif sur Yvette, France.
    Fokialakis, Nikolas
    Division of Pharmacognosy and Chemistry of Natural Products, Department of Pharmacy, National and Kapodistrian University of Athens, 15771 Athens, Greece.
    Topakas, Evangelos
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik. Industrial Biotechnology & Biocatalysis Group, Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens, 15780 Athens, Greece.
    Degradation Mechanism of 2,4-Dichlorophenol by Fungi Isolated from Marine Invertebrates2020Ingår i: International Journal of Molecular Sciences, ISSN 1661-6596, E-ISSN 1422-0067, Vol. 21, nr 9, artikel-id 3317Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    2,4-Dichlorophenol (2,4-DCP) is a ubiquitous environmental pollutant categorized as a priority pollutant by the United States (US) Environmental Protection Agency, posing adverse health effects on humans and wildlife. Bioremediation is proposed as an eco-friendly, cost-effective alternative to traditional physicochemical remediation techniques. In the present study, fungal strains were isolated from marine invertebrates and tested for their ability to biotransform 2,4-DCP at a concentration of 1 mM. The most competent strains were studied further for the expression of catechol dioxygenase activities and the produced metabolites. One strain, identified as Tritirachium sp., expressed high levels of extracellular catechol 1,2-dioxygenase activity. The same strain also produced a dechlorinated cleavage product of the starting compound, indicating the assimilation of the xenobiotic by the fungus. This work also enriches the knowledge about the mechanisms employed by marine-derived fungi in order to defend themselves against chlorinated xenobiotics.

  • 3.
    Rastogi, Simran
    et al.
    Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110029, India.
    Sharma, Vaibhav
    Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110029, India.
    Bharti, Prahalad Singh
    Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110029, India.
    Rani, Komal
    Department of Biotechnology, Amity University, Mumbai 410206, India.
    Modi, Gyan P.
    Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, India.
    Nikolajeff, Fredrik
    Luleå tekniska universitet, Institutionen för hälsovetenskap, Omvårdnad och medicinsk teknik.
    Kumar, Saroj
    Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110029, India.
    The Evolving Landscape of Exosomes in Neurodegenerative Diseases: Exosomes Characteristics and a Promising Role in Early Diagnosis2021Ingår i: International Journal of Molecular Sciences, ISSN 1661-6596, E-ISSN 1422-0067, Vol. 22, nr 1, artikel-id 440Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Neurodegenerative diseases (ND) remains to be one of the biggest burdens on healthcare systems and serves as a leading cause of disability and death. Alzheimer’s disease (AD) is among the most common of such disorders, followed by Parkinson’s disease (PD). The basic molecular details of disease initiation and pathology are still under research. Only recently, the role of exosomes has been linked to the initiation and progression of these neurodegenerative diseases. Exosomes are small bilipid layer enclosed extracellular vesicles, which were once considered as a cellular waste and functionless. These nano-vesicles of 30–150 nm in diameter carry specific proteins, lipids, functional mRNAs, and high amounts of non-coding RNAs (miRNAs, lncRNAs, and circRNAs). As the exosomes content is known to vary as per their originating and recipient cells, these vesicles can be utilized as a diagnostic biomarker for early disease detection. Here we review exosomes, their biogenesis, composition, and role in neurodegenerative diseases. We have also provided details for their characterization through an array of available techniques. Their updated role in neurodegenerative disease pathology is also discussed. Finally, we have shed light on a novel field of salivary exosomes as a potential candidate for early diagnosis in neurodegenerative diseases and compared the biomarkers of salivary exosomes with other blood/cerebrospinal fluid (CSF) based exosomes within these neurological ailments

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