1
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Ricciardi V, Lasalvia M, Perna G, Portaccio M, Delfino I, Lepore M, Capozzi V, Manti L. Vibrational spectroscopies for biochemical investigation of X-ray exposure effects on SH-SY5Y human neuroblastoma cells. Radiat Environ Biophys 2023:10.1007/s00411-023-01035-2. [PMID: 37392215 DOI: 10.1007/s00411-023-01035-2] [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: 02/23/2023] [Accepted: 06/20/2023] [Indexed: 07/03/2023]
Abstract
Neuroblastoma is the most recurring cancer in childhood and adolescence. The SH-SY5Y neuroblastoma cell line is generally adopted for elaborating new therapeutical approaches and/or elaborating strategies for the prevention of central nervous system disturbances. In fact, it represents a valid model system for investigating in vitro the effects on the brain of X-ray exposure using vibrational spectroscopies that can detect early radiation-induced molecular alterations of potential clinical usefulness. In recent years, we dedicated significant efforts in the use of Fourier-transform and Raman microspectroscopy techniques for characterizing such radiation-induced effects on SH-SY5Y cells by examining the contributions from different cell components (DNA, proteins, lipids, and carbohydrates) to the vibrational spectra. In this review, we aim at revising and comparing the main results of our studies to provide a wide outlook of the latest outcomes and a framework for future radiobiology research using vibrational spectroscopies. A short description of our experimental approaches and data analysis procedures is also reported.
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Affiliation(s)
- Valerio Ricciardi
- Istituto Nazionale di Fisica Nucleare-Sezione di Napoli, 80100, Naples, Italy
| | - Maria Lasalvia
- Dipartimento di Medicina Clinica e Sperimentale, Università di Foggia, 71122, Foggia, Italy
- Istituto Nazionale di Fisica Nucleare-Sezione di Bari, 70100, Bari, Italy
| | - Giuseppe Perna
- Dipartimento di Medicina Clinica e Sperimentale, Università di Foggia, 71122, Foggia, Italy
- Istituto Nazionale di Fisica Nucleare-Sezione di Bari, 70100, Bari, Italy
| | - Marianna Portaccio
- Dipartimento di Medicina Sperimentale, Università della Campania "Luigi Vanvitelli", 80138, Naples, Italy
| | - Ines Delfino
- Dipartimento di Scienze Ecologiche e Biologiche, Università degli Studi della Tuscia, Viterbo, Italy.
| | - Maria Lepore
- Dipartimento di Medicina Sperimentale, Università della Campania "Luigi Vanvitelli", 80138, Naples, Italy
| | - Vito Capozzi
- Dipartimento di Medicina Clinica e Sperimentale, Università di Foggia, 71122, Foggia, Italy
- Istituto Nazionale di Fisica Nucleare-Sezione di Bari, 70100, Bari, Italy
| | - Lorenzo Manti
- Istituto Nazionale di Fisica Nucleare-Sezione di Napoli, 80100, Naples, Italy
- Dipartimento di Fisica "E. Pancini", Università degli Studi di Napoli "Federico II", 80100, Naples, Italy
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2
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Lepore M, Delfino I. Optical Sensors Technology and Applications. Sensors (Basel) 2022; 22:7905. [PMID: 36298255 PMCID: PMC9611779 DOI: 10.3390/s22207905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 09/26/2022] [Indexed: 06/16/2023]
Abstract
Optical methods are non-invasive tools, and their use in various fields, including sensing applications, is continuously increasing, which is thanks to the continuous development of innovative low-cost sources and detectors [...].
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Affiliation(s)
- Maria Lepore
- Dipartimento di Medicina Sperimentale, Università della Campania “Luigi Vanvitelli”, I-80138 Napoli, Italy
| | - Ines Delfino
- Dipartimento di Scienze Ecologiche e Biologiche, Università della Tuscia, I-01100 Viterbo, Italy
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3
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Borrego-Varillas R, Nenov A, Kabaciński P, Conti I, Ganzer L, Oriana A, Jaiswal VK, Delfino I, Weingart O, Manzoni C, Rivalta I, Garavelli M, Cerullo G. Tracking excited state decay mechanisms of pyrimidine nucleosides in real time. Nat Commun 2021; 12:7285. [PMID: 34907186 PMCID: PMC8671501 DOI: 10.1038/s41467-021-27535-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 11/24/2021] [Indexed: 11/18/2022] Open
Abstract
DNA owes its remarkable photostability to its building blocks-the nucleosides-that efficiently dissipate the energy acquired upon ultraviolet light absorption. The mechanism occurring on a sub-picosecond time scale has been a matter of intense debate. Here we combine sub-30-fs transient absorption spectroscopy experiments with broad spectral coverage and state-of-the-art mixed quantum-classical dynamics with spectral signal simulations to resolve the early steps of the deactivation mechanisms of uridine (Urd) and 5-methyluridine (5mUrd) in aqueous solution. We track the wave packet motion from the Franck-Condon region to the conical intersections (CIs) with the ground state and observe spectral signatures of excited-state vibrational modes. 5mUrd exhibits an order of magnitude longer lifetime with respect to Urd due to the solvent reorganization needed to facilitate bulky methyl group motions leading to the CI. This activates potentially lesion-inducing dynamics such as ring opening. Involvement of the 1nπ* state is found to be negligible.
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Affiliation(s)
| | - Artur Nenov
- Dipartimento di Chimica Industriale, Università degli Studi di Bologna, Viale del Risorgimento 4, Bologna, Italy
| | - Piotr Kabaciński
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano, Italy
| | - Irene Conti
- Dipartimento di Chimica Industriale, Università degli Studi di Bologna, Viale del Risorgimento 4, Bologna, Italy
| | - Lucia Ganzer
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano, Italy
| | - Aurelio Oriana
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano, Italy
| | - Vishal Kumar Jaiswal
- Dipartimento di Chimica Industriale, Università degli Studi di Bologna, Viale del Risorgimento 4, Bologna, Italy
| | - Ines Delfino
- Dipartimento di Scienze Ecologiche e Biologiche, Università della Tuscia, Via San Camillo de Lellis, snc, Viterbo, Italy
| | - Oliver Weingart
- Institut für Theoretische Chemie und Computerchemie, Heinrich Heine Universität Düsseldorf, Universitätsstrasse 1, Düsseldorf, Germany
| | | | - Ivan Rivalta
- Dipartimento di Chimica Industriale, Università degli Studi di Bologna, Viale del Risorgimento 4, Bologna, Italy
- Université de Lyon, École Normale Supérieure de Lyon, CNRS UMR 5182, Laboratoire de Chimie, 46 allée d'Italie, F69364, Lyon, France
| | - Marco Garavelli
- Dipartimento di Chimica Industriale, Università degli Studi di Bologna, Viale del Risorgimento 4, Bologna, Italy.
| | - Giulio Cerullo
- IFN-CNR, Piazza Leonardo da Vinci 32, Milano, Italy.
- Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano, Italy.
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4
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Piccinino D, Capecchi E, Delfino I, Crucianelli M, Conte N, Avitabile D, Saladino R. Green and Scalable Preparation of Colloidal Suspension of Lignin Nanoparticles and Its Application in Eco-friendly Sunscreen Formulations. ACS Omega 2021; 6:21444-21456. [PMID: 34471747 PMCID: PMC8387983 DOI: 10.1021/acsomega.1c02268] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 07/16/2021] [Indexed: 05/15/2023]
Abstract
Lignin nanoparticles (LNPs) are applied in several industrial applications. The nanoprecipitation of LNPs is fast and inexpensive but currently still limited to the use of hazardous organic solvents, making it difficult to apply them on a large scale. Here, we report a scalable nanoprecipitation procedure for the preparation of colloidal lignin nanoparticles (cLNPs) by the use of the green solvents dimethylisosorbide and isopropylidene glycerol. Irrespective of the experimental conditions, cLNPs showed higher UV absorbing properties and radical scavenging activity than parent LNPs and raw lignin. cLNPs were successively used in the preparation of eco-friendly sunscreen formulations (SPF 15, 30, and 50+, as evaluated by the COLIPA assay), which showed high UV-shielding activity even in the absence of synthetic boosters (microplastics) and physical filters (TiO2 and ZnO). Biological assays on human HaCaT keratinocytes and human skin equivalents demonstrated the absence of cytotoxicity and genotoxicity, associated with an optimal protection of the skin from UV-A damage.
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Affiliation(s)
- Davide Piccinino
- Department
of Biological and Ecological Sciences, University
of Tuscia, Via S. Camillo de Lellis, 01100 Viterbo, Italy
| | - Eliana Capecchi
- Department
of Biological and Ecological Sciences, University
of Tuscia, Via S. Camillo de Lellis, 01100 Viterbo, Italy
| | - Ines Delfino
- Department
of Biological and Ecological Sciences, University
of Tuscia, Via S. Camillo de Lellis, 01100 Viterbo, Italy
| | - Marcello Crucianelli
- Department
of Physical and Chemical Sciences, University
of Aquila, Via Vetoio
I, Coppito, 67100 L’Aquila, Italy
| | - Nicola Conte
- IDI
Farmaceutici, Via dei castelli Romani 73/75, Pomezia 00071, Rome, Italy
| | - Daniele Avitabile
- IDI
Farmaceutici, Via dei castelli Romani 73/75, Pomezia 00071, Rome, Italy
| | - Raffaele Saladino
- Department
of Biological and Ecological Sciences, University
of Tuscia, Via S. Camillo de Lellis, 01100 Viterbo, Italy
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d’Apuzzo F, Nucci L, Delfino I, Portaccio M, Minervini G, Isola G, Serino I, Camerlingo C, Lepore M. Application of Vibrational Spectroscopies in the Qualitative Analysis of Gingival Crevicular Fluid and Periodontal Ligament during Orthodontic Tooth Movement. J Clin Med 2021; 10:jcm10071405. [PMID: 33915746 PMCID: PMC8036342 DOI: 10.3390/jcm10071405] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [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: 02/14/2021] [Revised: 03/19/2021] [Accepted: 03/24/2021] [Indexed: 02/07/2023] Open
Abstract
Optical vibrational techniques show a high potentiality in many biomedical fields for their characteristics of high sensitivity in revealing detailed information on composition, structure, and molecular interaction with reduced analysis time. In the last years, we have used these techniques for investigating gingival crevicular fluid (GCF) and periodontal ligament (PDL) during orthodontic tooth treatment. The analysis with Raman and infrared signals of GCF and PDL samples highlighted that different days of orthodontic force application causes modifications in the molecular secondary structure at specific wavenumbers related to the Amide I, Amide III, CH deformation, and CH3/CH2. In the present review, we report the most relevant results and a brief description of the experimental techniques and data analysis procedure in order to evidence that the vibrational spectroscopies could be a potential useful tool for an immediate monitoring of the individual patient's response to the orthodontic tooth movement, aiming to more personalized treatment reducing any side effects.
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Affiliation(s)
- Fabrizia d’Apuzzo
- Multidisciplinary Department of Medical-Surgical and Dental Specialties, University of Campania Luigi Vanvitelli, 80138 Napoli, Italy; (L.N.); (G.M.)
- Correspondence: ; Tel.: +39-3384820462
| | - Ludovica Nucci
- Multidisciplinary Department of Medical-Surgical and Dental Specialties, University of Campania Luigi Vanvitelli, 80138 Napoli, Italy; (L.N.); (G.M.)
| | - Ines Delfino
- Department of Ecological and Biological Sciences, University of Tuscia, 01100 Viterbo, Italy;
| | - Marianna Portaccio
- Department of Experimental Medicine, University of Campania Luigi Vanvitelli, 80138 Napoli, Italy; (M.P.); (I.S.); (M.L.)
| | - Giuseppe Minervini
- Multidisciplinary Department of Medical-Surgical and Dental Specialties, University of Campania Luigi Vanvitelli, 80138 Napoli, Italy; (L.N.); (G.M.)
| | - Gaetano Isola
- Department of General Surgery and Medical-Surgical Specialties, University of Catania, 95124 Catania, Italy;
| | - Ismene Serino
- Department of Experimental Medicine, University of Campania Luigi Vanvitelli, 80138 Napoli, Italy; (M.P.); (I.S.); (M.L.)
| | - Carlo Camerlingo
- CNR-SPIN, SuPerconductivity and Other INnovative Materials and Devices Institute, 80078 Pozzuoli, Italy;
| | - Maria Lepore
- Department of Experimental Medicine, University of Campania Luigi Vanvitelli, 80138 Napoli, Italy; (M.P.); (I.S.); (M.L.)
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6
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Bizzarri BM, Saladino R, Delfino I, García-Ruiz JM, Di Mauro E. Prebiotic Organic Chemistry of Formamide and the Origin of Life in Planetary Conditions: What We Know and What Is the Future. Int J Mol Sci 2021; 22:ijms22020917. [PMID: 33477625 PMCID: PMC7831497 DOI: 10.3390/ijms22020917] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 01/14/2021] [Accepted: 01/17/2021] [Indexed: 11/18/2022] Open
Abstract
The goal of prebiotic chemistry is the depiction of molecular evolution events preceding the emergence of life on Earth or elsewhere in the cosmos. Plausible experimental models require geochemical scenarios and robust chemistry. Today we know that the chemical and physical conditions for life to flourish on Earth were at work much earlier than thought, i.e., earlier than 4.4 billion years ago. In recent years, a geochemical model for the first five hundred million years of the history of our planet has been devised that would work as a cradle for life. Serpentinization processes in the Hadean eon affording self-assembled structures and vesicles provides the link between the catalytic properties of the inorganic environment and the impressive chemical potential of formamide to produce complete panels of organic molecules relevant in pre-genetic and pre-metabolic processes. Based on an interdisciplinary approach, we propose basic transformations connecting geochemistry to the chemistry of formamide, and we hint at the possible extension of this perspective to other worlds.
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Affiliation(s)
- Bruno Mattia Bizzarri
- Ecological and Biological Sciences Department (DEB), University of Tuscia, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy; (B.M.B.); (I.D.); (E.D.M.)
| | - Raffaele Saladino
- Ecological and Biological Sciences Department (DEB), University of Tuscia, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy; (B.M.B.); (I.D.); (E.D.M.)
- Correspondence: (R.S.); (J.M.G.-R.)
| | - Ines Delfino
- Ecological and Biological Sciences Department (DEB), University of Tuscia, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy; (B.M.B.); (I.D.); (E.D.M.)
| | - Juan Manuel García-Ruiz
- Laboratorio de Estudios Cristalográficos, Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Científicas–Universidad de Granada, Avenida de las Palmeras 4, Armilla, 18100 Granada, Spain
- Correspondence: (R.S.); (J.M.G.-R.)
| | - Ernesto Di Mauro
- Ecological and Biological Sciences Department (DEB), University of Tuscia, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy; (B.M.B.); (I.D.); (E.D.M.)
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7
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Cennamo G, Montorio D, Morra VB, Criscuolo C, Lanzillo R, Salvatore E, Camerlingo C, Lisitskiy M, Delfino I, Portaccio M, Lepore M. Surface-enhanced Raman spectroscopy of tears: toward a diagnostic tool for neurodegenerative disease identification. J Biomed Opt 2020; 25:1-12. [PMID: 32767890 PMCID: PMC7406892 DOI: 10.1117/1.jbo.25.8.087002] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 07/23/2020] [Indexed: 05/31/2023]
Abstract
SIGNIFICANCE A noninvasive method based on surface-enhanced Raman spectroscopy (SERS) of tears was proposed as a support for diagnosing neurodegenerative pathologies, including different forms of dementia and Alzheimer's disease (AD). In this field, timely and reliable discrimination and diagnosis are critical aspects for choosing a valid medical therapy, and new methods are highly required. AIM The aim is to evince spectral differences in SERS response of human tears from AD affected, mild cognitive impaired (MCI), and healthy control (Ctr) subjects. APPROACH Human tears were characterized by SERS coupled with multivariate data analysis. Thirty-one informed subjects (Ctr, MCI, and AD) were considered. RESULTS Average SERS spectra from Ctr, MCI, and AD subjects evidenced differences related to lactoferrin and lysozyme protein components. Quantitative changes were also observed by determining the intensity ratio between selected bands. We also constructed a classification model that discriminated among AD, MCI, and Ctr subjects. The model was built using the scores obtained by performing principal component analysis on specific spectral regions (i-PCA). CONCLUSIONS The results are very encouraging with interesting perspectives for medical applications as support of clinical diagnosis and discrimination of AD from other forms of dementia.
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Affiliation(s)
- Gilda Cennamo
- Universitá “Federico II” di Napoli, Dipartimento di Sanitá Pubblica, Napoli, Italy
| | - Daniela Montorio
- Universitá “Federico II” di Napoli, Dipartimento di Neuroscienze e Sci. Riproduttive e Odontostomatologiche, Napoli, Italy
| | - Vincenzo Brescia Morra
- Universitá “Federico II” di Napoli, Dipartimento di Neuroscienze e Sci. Riproduttive e Odontostomatologiche, Napoli, Italy
| | - Chiara Criscuolo
- Universitá “Federico II” di Napoli, Dipartimento di Neuroscienze e Sci. Riproduttive e Odontostomatologiche, Napoli, Italy
| | - Roberta Lanzillo
- Universitá “Federico II” di Napoli, Dipartimento di Neuroscienze e Sci. Riproduttive e Odontostomatologiche, Napoli, Italy
| | - Elena Salvatore
- Universitá “Federico II” di Napoli, Dipartimento di Neuroscienze e Sci. Riproduttive e Odontostomatologiche, Napoli, Italy
| | - Carlo Camerlingo
- CNR-SPIN, Ist. Superconduttori, Materiali Innovativi e Dispositivi, Consiglio Nazionale delle Ricerche, Pozzuoli, Italy
| | - Mikhail Lisitskiy
- CNR-SPIN, Ist. Superconduttori, Materiali Innovativi e Dispositivi, Consiglio Nazionale delle Ricerche, Pozzuoli, Italy
| | - Ines Delfino
- Universitá della Tuscia, Dipartimento di Scienze Ecologiche e Biologiche, Viterbo, Italy
| | - Marianna Portaccio
- Universitá della Campania “L. Vanvitelli,” Dipartimento di Medicina Sperimentale, Napoli, Italy
| | - Maria Lepore
- Universitá della Campania “L. Vanvitelli,” Dipartimento di Medicina Sperimentale, Napoli, Italy
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Delfino I, Ricciardi V, Manti L, Lasalvia M, Lepore M. Multivariate Analysis of Difference Raman Spectra of the Irradiated Nucleus and Cytoplasm Region of SH-SY5Y Human Neuroblastoma Cells. Sensors (Basel) 2019; 19:E3971. [PMID: 31540064 PMCID: PMC6766837 DOI: 10.3390/s19183971] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 09/10/2019] [Accepted: 09/13/2019] [Indexed: 12/15/2022]
Abstract
Previous works showed that spatially resolved Raman spectra of cytoplasm and nucleus region of single cells exposed to X-rays evidence different features. The present work aims to introduce a new approach to profit from these differences to deeper investigate X-ray irradiation effects on single SH-SY5Y human neuroblastoma cells. For this aim, Raman micro-spectroscopy was performed in vitro on single cells after irradiation by graded X-ray doses (2, 4, 6, 8 Gy). Spectra from nucleus and cytoplasm regions were selectively acquired. The examination by interval Principal Component Analysis (i-PCA) of the difference spectra obtained by subtracting each cytoplasm-related spectrum from the corresponding one detected at the nucleus enabled us to reveal the subtle modifications of Raman features specific of different spatial cell regions. They were discussed in terms of effects induced by X-ray irradiation on DNA/RNA, lipids, and proteins. The proposed approach enabled us to evidence some features not outlined in previous investigations.
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Affiliation(s)
- Ines Delfino
- Dipartimento di Scienze Ecologiche e Biologiche, Università della Tuscia, 01100 Viterbo, Italy.
| | - Valerio Ricciardi
- Dipartimento di Medicina Sperimentale, Università della Campania "L. Vanvitelli", 80100 Napoli, Italy.
- Istituto Nazionale di Fisica Nucleare, sezione di Napoli, 80126 Napoli, Italy.
| | - Lorenzo Manti
- Istituto Nazionale di Fisica Nucleare, sezione di Napoli, 80126 Napoli, Italy.
- Dipartimento di Fisica, Università "Federico II," 80126 Napoli, Italy.
| | - Maria Lasalvia
- Dipartimento di Medicina Clinica e Sperimentale, Università di Foggia, 71100 Foggia, Italy.
- Istituto Nazionale di Fisica Nucleare, sezione di Bari, 70125 Bari, Italy.
| | - Maria Lepore
- Dipartimento di Medicina Sperimentale, Università della Campania "L. Vanvitelli", 80100 Napoli, Italy.
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Baumberg J, Bell S, Bonifacio A, Chikkaraddy R, Chisanga M, Corsetti S, Delfino I, Eremina O, Fasolato C, Faulds K, Fleming H, Goodacre R, Graham D, Hardy M, Jamieson L, Keyes T, Królikowska A, Kuttner C, Langer J, Lightner C, Mahajan S, Masson JF, Muhamadali H, Natan M, Nicolson F, Nikelshparg E, Plakas K, Popp J, Porter M, Prezgot D, Pytlik N, Schlücker S, Silvestri A, Stone N, Tian ZQ, Tripathi A, Willner M, Wuytens P. SERS in biology/biomedical SERS: general discussion. Faraday Discuss 2019; 205:429-456. [PMID: 29160893 DOI: 10.1039/c7fd90089a] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Esposito R, Delfino I, Portaccio M, Iannuzzi C, Lepore M. An insight into pH-induced changes in FAD conformational structure by means of time-resolved fluorescence and circular dichroism. Eur Biophys J 2019; 48:395-403. [PMID: 31053922 DOI: 10.1007/s00249-019-01369-0] [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] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 04/02/2019] [Accepted: 04/25/2019] [Indexed: 11/26/2022]
Abstract
Optical properties of flavin adenine dinucleotide (FAD) moiety are widely used nowadays for biotechnological applications. Given the fundamental role played by FAD, additional structural information about this enzymatic cofactor can be extremely useful in order to obtain a greater insight into its functional role in proteins. For this purpose, we have investigated FAD behaviour in aqueous solutions at different pH values by a novel approach based on the combined use of time-resolved fluorescence and circular dichroism spectroscopies. The results showed that pH strongly affects time-resolved fluorescence emission and the analysis allowed us to detect a three-component decay for FAD in aqueous solution with pH-depending lifetimes and relative amplitudes. Circular dichroism data were analyzed by a multi-Gaussian fitting procedure and the trends of properly chosen parameters confirmed pH-depending changes. The comparison between the results obtained by these two optical techniques allowed us to improve the significance of the outcome of circular dichroism. This combined approach may provide a useful tool for biotechnological investigation.
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Affiliation(s)
- Rosario Esposito
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione industriale, Università Federico II, P.le Tecchio 80, 80125, Naples, Italy
| | - Ines Delfino
- Dipartimento di Scienze Ecologiche e Biologiche, Università della Tuscia, Largo dell'Università snc, 01100, Viterbo, Italy.
| | - Marianna Portaccio
- Dipartimento di Medicina Sperimentale, Università della Campania "Luigi Vanvitelli", Via S.M. Costantinopoli 16, 80134, Naples, Italy
| | - Clara Iannuzzi
- Dipartimento di Medicina di Precisione, Università della Campania "Luigi Vanvitelli", Via L. De Crecchio 7, 80138, Naples, Italy
| | - Maria Lepore
- Dipartimento di Medicina Sperimentale, Università della Campania "Luigi Vanvitelli", Via S.M. Costantinopoli 16, 80134, Naples, Italy
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11
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Aitchison H, Aizpurua J, Arnolds H, Baumberg J, Bell S, Bonifacio A, Chikkaraddy R, Dawson P, de Nijs B, Deckert V, Delfino I, Di Martino G, Eremina O, Faulds K, Fountain A, Gawinkowski S, Gomez Castano M, Goodacre R, Gracie J, Graham D, Guicheteau J, Hardwick L, Hardy M, Heck C, Jamieson L, Kamp M, Keeler A, Kuttner C, Langer J, Mahajan S, Martín Sabanés N, Murakoshi K, Porter M, Schatz G, Schlücker S, Tian Z, Tripathi A, Van Duyne R, Vikesland P. Analytical SERS: general discussion. Faraday Discuss 2019; 205:561-600. [PMID: 29165464 DOI: 10.1039/c7fd90096a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Graham D, Goodacre R, Arnolds H, Masson JF, Schatz G, Baumberg J, Kim DH, Aizpurua J, Lum W, Silvestri A, de Nijs B, Xu Y, Di Martino G, Natan M, Schlücker S, Wuytens P, Bruzas I, Kuttner C, Hardy M, Chikkaraddy R, Martín Sabanés N, Delfino I, Dawson P, Gawinkowski S, Bontempi N, Mahajan S, Reich S, Hourahine B, Bell S, Królikowska A, Porter M, Keeler A, Kamp M, Fountain A, Fasolato C, Giorgis F, Otero JC, Matricardi C, Van Duyne R, Lombardi J, Deckert V, Velleman L. Theory of SERS enhancement: general discussion. Faraday Discuss 2019; 205:173-211. [PMID: 29164205 DOI: 10.1039/c7fd90095c] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Delfino I, Perna G, Ricciardi V, Lasalvia M, Manti L, Capozzi V, Lepore M. X-ray irradiation effects on nuclear and membrane regions of single SH-SY5Y human neuroblastoma cells investigated by Raman micro-spectroscopy. J Pharm Biomed Anal 2019; 164:557-573. [DOI: 10.1016/j.jpba.2018.11.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 11/09/2018] [Accepted: 11/11/2018] [Indexed: 11/28/2022]
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14
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Borrego-Varillas R, Nenov A, Ganzer L, Oriana A, Conti I, Delfino I, Manzoni C, Garavelli M, Cerullo G. Conical intersection dynamics of pyrimidine nucleosides tracked with sub-20-fs UV pulses. EPJ Web Conf 2019. [DOI: 10.1051/epjconf/201920510007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
By combining transient absorption spectroscopy with sub-20-fs UV pulses and ab initio numerical simulations we follow the ultrafast dynamics in pyrimidine nucleosides and visualize the passage through conical intersections presiding excited state deactivation.
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15
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Capecchi E, Piccinino D, Delfino I, Bollella P, Antiochia R, Saladino R. Functionalized Tyrosinase-Lignin Nanoparticles as Sustainable Catalysts for the Oxidation of Phenols. Nanomaterials (Basel) 2018; 8:E438. [PMID: 29914085 PMCID: PMC6027214 DOI: 10.3390/nano8060438] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [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: 05/22/2018] [Revised: 06/12/2018] [Accepted: 06/14/2018] [Indexed: 02/07/2023]
Abstract
Sustainable catalysts for the oxidation of phenol derivatives under environmentally friendly conditions were prepared by the functionalization of lignin nanoparticles with tyrosinase. Lignin, the most abundant polyphenol in nature, is the main byproduct in the pulp and paper manufacturing industry and biorefinery. Tyrosinase has been immobilized by direct adsorption, encapsulation, and layer-by-layer deposition, with or without glutaraldehyde reticulation. Lignin nanoparticles were found to be stable to the tyrosinase activity. After the enzyme immobilization, they showed a moderate to high catalytic effect in the synthesis of catechol derivatives, with the efficacy of the catalyst being dependent on the specific immobilization procedures.
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Affiliation(s)
- Eliana Capecchi
- Department of Biological and Ecological Sciences, University of Tuscia, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy.
| | - Davide Piccinino
- Department of Biological and Ecological Sciences, University of Tuscia, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy.
| | - Ines Delfino
- Department of Biological and Ecological Sciences, University of Tuscia, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy.
| | - Paolo Bollella
- Department of Chemistry and Drug Technologies, Sapienza University of Rome P.le Aldo Moro 5, 00185 Rome, Italy.
| | - Riccarda Antiochia
- Department of Chemistry and Drug Technologies, Sapienza University of Rome P.le Aldo Moro 5, 00185 Rome, Italy.
| | - Raffaele Saladino
- Department of Biological and Ecological Sciences, University of Tuscia, Via S. Camillo de Lellis snc, 01100 Viterbo, Italy.
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16
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d'Apuzzo F, Perillo L, Delfino I, Portaccio M, Lepore M, Camerlingo C. Monitoring early phases of orthodontic treatment by means of Raman spectroscopies. J Biomed Opt 2017; 22:1-10. [PMID: 29110445 DOI: 10.1117/1.jbo.22.11.115001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [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: 07/21/2017] [Accepted: 10/12/2017] [Indexed: 05/06/2023]
Abstract
Gingival crevicular fluid (GCF) is a site-specific exudate in the gingival sulcus. GCF composition changes in response to diseases or mechanical stimuli, such as those occurring during orthodontic treatments. Raman microspectroscopy (μ-RS) and surface-enhanced Raman spectroscopy (SERS) were adopted for a GCF analysis during different initial phases of orthodontic force application. GCF samples were pooled from informed patients using paper cones. SERS spectra were obtained from GCF extracted from these cones, whereas μ-RS spectra were directly acquired on paper cones without any manipulation. The spectral characteristics of the main functional groups and the changes in cytochrome, amide III, and amide I contributions were highlighted in the different phases of orthodontic treatment with both SERS and μ-RS analysis. μ-RS directly performed on the paper cones together with proper statistical methods can offer an effective approach for the development of a tool for monitoring the processes occurring during orthodontic treatments, which may help the clinician in the choice of type of treatment individually for each patient and accelerate and improve the orthodontic therapy.
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Affiliation(s)
- Fabrizia d'Apuzzo
- Università degli Studi della Campania "Luigi Vanvitelli," Dipartimento Multidisciplinare di Speciali, Italy
| | - Letizia Perillo
- Università degli Studi della Campania "Luigi Vanvitelli," Dipartimento Multidisciplinare di Speciali, Italy
| | - Ines Delfino
- Università della Tuscia, Dipartimento di Scienze Ecologiche e Biologiche, Viterbo, Italy
| | - Marianna Portaccio
- Università degli Studi della Campania "Luigi Vanvitelli," Dipartimento di Medicina Sperimentale, Nap, Italy
| | - Maria Lepore
- Università degli Studi della Campania "Luigi Vanvitelli," Dipartimento di Medicina Sperimentale, Nap, Italy
| | - Carlo Camerlingo
- CNR-SPIN, Istituto Superconduttori, Materiali Innovativi e Dispositivi, Pozzuoli, Napoli, Italy
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17
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La Gatta A, Ricci G, Stellavato A, Cammarota M, Filosa R, Papa A, D’Agostino A, Portaccio M, Delfino I, De Rosa M, Schiraldi C. Hyaluronan hydrogels with a low degree of modification as scaffolds for cartilage engineering. Int J Biol Macromol 2017; 103:978-989. [DOI: 10.1016/j.ijbiomac.2017.05.091] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 03/30/2017] [Accepted: 05/16/2017] [Indexed: 12/21/2022]
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18
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Lepore M, Portaccio M, Delfino I, Sironi L, La Gatta A, D'Agostino A, Izzo E, Schiraldi C. Physico-optical properties of a crosslinked hyaluronic acid scaffold for biomedical applications. J Appl Polym Sci 2017. [DOI: 10.1002/app.45243] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Maria Lepore
- Dipartimento di Medicina Sperimentale; Università della Campania “Luigi Vanvitelli; Naples I-80123 Italy
| | - Marianna Portaccio
- Dipartimento di Medicina Sperimentale; Università della Campania “Luigi Vanvitelli; Naples I-80123 Italy
| | - Ines Delfino
- Dipartimento di Scienze Ecologiche e Biologiche; Università della Tuscia; Viterbo I-01100 Italy
| | - Laura Sironi
- Dipartimento di Fisica “G. Occhialini”; Università degli Studi di Milano-Bicocca; Milano I-20126 Italy
| | - Annalisa La Gatta
- Dipartimento di Medicina Sperimentale; Università della Campania “Luigi Vanvitelli; Naples I-80123 Italy
| | - Antonella D'Agostino
- Dipartimento di Medicina Sperimentale; Università della Campania “Luigi Vanvitelli; Naples I-80123 Italy
| | - E. Izzo
- Dipartimento di Medicina Sperimentale; Università della Campania “Luigi Vanvitelli; Naples I-80123 Italy
| | - Chiara Schiraldi
- Dipartimento di Medicina Sperimentale; Università della Campania “Luigi Vanvitelli; Naples I-80123 Italy
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19
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Camerlingo C, Portaccio M, Tatè R, Lepore M, Delfino I. Fructose and Pectin Detection in Fruit-Based Food Products by Surface-Enhanced Raman Spectroscopy. Sensors (Basel) 2017; 17:s17040839. [PMID: 28398254 PMCID: PMC5422200 DOI: 10.3390/s17040839] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Revised: 04/07/2017] [Accepted: 04/08/2017] [Indexed: 02/04/2023]
Abstract
Surface-Enhanced Raman Spectroscopy (SERS) enables the investigation of samples with weak specific Raman signals, such as opaque samples, including fruit juices and pulp. In this paper, biological apple juices and apple/pear pulp have been studied in order to evidence the presence of fructose and pectin, which are components of great relevance for quality assessment of these kinds of products. In order to perform SERS measurements a low-cost home-made substrate consisting of a glass slide decorated with 30-nm-sized gold nanoparticles has been designed and used. By employing a conventional micro-Raman spectroscopy set-up and a suitable data treatment based on "wavelet" denoising algorithms and background subtraction, spectra of pectin and fructose with clear Raman features have been obtained. The results have confirmed the potential of SERS in the food industry for product characterization, also considering the low-cost and the relative ease of the fabrication process of the employed SERS substrate.
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Affiliation(s)
- Carlo Camerlingo
- CNR-SPIN, Istituto Superconduttori, Materiali Innovativi e Dispositivi, 80078 Pozzuoli (Na), Italy.
| | - Marianna Portaccio
- Dipartimento di Medicina Sperimentale, Università della Campania "Luigi Vanvitelli", 80138 Naples, Italy.
| | - Rosarita Tatè
- Institute of Genetics and Biophysics-ABT, CNR, 80131 Naples, Italy.
| | - Maria Lepore
- Dipartimento di Medicina Sperimentale, Università della Campania "Luigi Vanvitelli", 80138 Naples, Italy.
| | - Ines Delfino
- Dipartimento di Scienze Ecologiche e Biologiche, Università della Tuscia, 01100 Viterbo, Italy.
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20
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Cirilli M, Delfino I, Caboni E, Muleo R. EpiHRMAssay, in tube and in silico combined approach for the scanning and epityping of heterogeneous DNA methylation. Biol Methods Protoc 2017; 2:bpw008. [PMID: 32161783 PMCID: PMC6994072 DOI: 10.1093/biomethods/bpw008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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: 07/14/2016] [Revised: 11/12/2016] [Accepted: 12/16/2016] [Indexed: 11/18/2022] Open
Abstract
Reliable and cost-effective assays with adequate sensitivity are required to detect the DNA methylation profile in plants for scientific and industrial purposes. The proposed novel assay, named EpiHRMAssay, allows to quantify the overall methylation status at target loci and to enable high-throughput analyses. It combines in tube High Resolution Melting Analysis on bisulphite-treated templates with the in silico prediction of the melting profile of virtual epialleles using uMELTSM software. The predicted melting temperatures (Tm-s) of a set of epialleles characterized by different numbers of methylated cytosines (#mC) or different mC configurations were obtained and used to build calibration models, enabling the quantification of methylation in unknown samples using only the in tube observed melting temperature (Tm-o). EpiHRMAssay was validated by analysing the promoter region of CMT3, DDM1, and ROS1 genes involved in the regulation of methylation/demethylation processes and chromatin remodelling within a population of peach plants. Results demonstrate that EpiHRMAssay is a sensitive and reliable tool for locus-specific large-scale research and diagnostic contexts of the regulative regions of genes, in a broad range of organisms, including mammals. EpiHRMAssay also provides complementary information for the assessment of heterogeneous methylation and can address an array of biological questions on epigenetic regulation for diversity studies and for large-scale functional genomics.
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Affiliation(s)
- Marco Cirilli
- Department of Agricultural and Forestry Sciences, University of Tuscia, Via S. Camillo de Lellis snc, Viterbo 01100, Italy
| | - Ines Delfino
- Department of Ecological and Biological Sciences, University of Tuscia, L.go dell'Università snc, Viterbo 01100, Italy
| | - Emilia Caboni
- Council for Agricultural Research and Analysis of Agricultural Economics (CREA), Fruit Tree Research Center, Via di Fioranello, 52, 00134 Rome, Italy
| | - Rosario Muleo
- Department of Agricultural and Forestry Sciences, University of Tuscia, Via S. Camillo de Lellis snc, Viterbo 01100, Italy
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21
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Aizpurua J, Arnolds H, Baumberg J, Bruzas I, Chikkaraddy R, Chisanga M, Dawson P, Deckert V, Delfino I, de Nijs B, Di Martino G, Edel J, Fleming H, Gawinkowski S, Giorgis F, Goodacre R, Graham D, Hardy M, Heck C, Heeg S, Hewitt K, Jamieson L, Keeler A, Królikowska A, Kuttner C, Lidgi-Guigui N, Lightner C, Lombardi J, Mahajan S, Martín Sabanés N, Masson JF, Mueller NS, Muhamadali H, Murakoshi K, Popp J, Porter M, Reich S, Schatz G, Tian ZQ, Tripathi A, Van Duyne R, Wang X, Wark A, Willets K(K, Willner M. Ultrasensitive and towards single molecule SERS: general discussion. Faraday Discuss 2017; 205:291-330. [DOI: 10.1039/c7fd90088k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Andolfi L, Masiero E, Giolo E, Martinelli M, Luppi S, Dal Zilio S, Delfino I, Bortul R, Zweyer M, Ricci G, Lazzarino M. Investigating the mechanical properties of zona pellucida of whole human oocytes by atomic force spectroscopy. Integr Biol (Camb) 2016; 8:886-93. [PMID: 27476747 DOI: 10.1039/c6ib00044d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The role of mechanics in numerous biological processes is nowadays recognized, while in others, such as the fertilization process, it is still neglected. In the case of oocytes the description of their mechanical properties could improve the comprehension of the oocyte-spermatozoon interaction and be helpful for application in in vitro fertilization (IVF) clinics. Herein the mechanical properties of whole human oocytes (HOs) immediately after retrieval are investigated by indentation measurements with atomic force spectroscopy under physiological conditions. Measurements are performed on immature (metaphase I - MI) and mature (metaphase II - MII) HOs. According to their morphological characteristics MII-HOs are classified as "suitable" and "rejected"; these latter would be usually rejected for intracytoplasmic sperm injection (ICSI). For all maturation stages we observe that the elastic response of the zona pellucida (ZP) outer layer was different and distinguishable from the rest of the ZP-HO. The elasticity of this ZP outer layer varies with maturation and quality: stiffness decreases from immature MI to good quality MII, up to poor-quality rejected MII. An indirect analysis with IVF outcome indicates that the ZP outer layer of analysed HOs donated by women who achieved pregnancy is stiffer than that of HOs from women with negative outcome. Our findings suggest that mechanical properties can represent important oocyte quality indicators that may be exploited for the design of innovative ICSI dedicated cell sorters.
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Affiliation(s)
- Laura Andolfi
- Istituto Officina dei Materiali-CNR, Basovizza, 34149 Trieste, Italy.
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23
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Baker MJ, Goodacre R, Sammon C, Marques MP, Gardner P, Tipping W, Sulé-Suso J, Wood B, Byrne HJ, Hermes M, Matousek P, Campbell CJ, El-Mashtoly S, Frost J, Phillips C, Diem M, Kohler A, Lau K, Kazarian S, Petrich W, Lloyd G, Delfino I, Cinque G, Isabelle M, Stone N, Kendall C, Jamieson L, Perez-Guaita D, Clark L, Gerwert K, Notingher I, Quaroni L, Bhargava R, Meade A, Lyng F. Single cell analysis/data handling: general discussion. Faraday Discuss 2016; 187:299-327. [PMID: 27282416 DOI: 10.1039/c6fd90012g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Maiuri M, Delfino I, Cerullo G, Manzoni C, Pelmenschikov V, Guo Y, Wang H, Gee LB, Dapper CH, Newton WE, Cramer SP. Low frequency dynamics of the nitrogenase MoFe protein via femtosecond pump probe spectroscopy - Observation of a candidate promoting vibration. J Inorg Biochem 2015; 153:128-135. [PMID: 26343576 DOI: 10.1016/j.jinorgbio.2015.07.005] [Citation(s) in RCA: 12] [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: 04/20/2015] [Revised: 06/18/2015] [Accepted: 07/09/2015] [Indexed: 11/28/2022]
Abstract
We have used femtosecond pump-probe spectroscopy (FPPS) to study the FeMo-cofactor within the nitrogenase (N2ase) MoFe protein from Azotobacter vinelandii. A sub-20-fs visible laser pulse was used to pump the sample to an excited electronic state, and a second sub-10-fs pulse was used to probe changes in transmission as a function of probe wavelength and delay time. The excited protein relaxes to the ground state with a ~1.2ps time constant. With the short laser pulse we coherently excited the vibrational modes associated with the FeMo-cofactor active site, which are then observed in the time domain. Superimposed on the relaxation dynamics, we distinguished a variety of oscillation frequencies with the strongest band peaks at ~84, 116, 189, and 226cm(-1). Comparison with data from nuclear resonance vibrational spectroscopy (NRVS) shows that the latter pair of signals comes predominantly from the FeMo-cofactor. The frequencies obtained from the FPPS experiment were interpreted with normal mode calculations using both an empirical force field (EFF) and density functional theory (DFT). The FPPS data were also compared with the first reported resonance Raman (RR) spectrum of the N2ase MoFe protein. This approach allows us to outline and assign vibrational modes having relevance to the catalytic activity of N2ase. In particular, the 226cm(-1) band is assigned as a potential 'promoting vibration' in the H-atom transfer (or proton-coupled electron transfer) processes that are an essential feature of N2ase catalysis. The results demonstrate that high-quality room-temperature solution data can be obtained on the MoFe protein by the FPPS technique and that these data provide added insight to the motions and possible operation of this protein and its catalytic prosthetic group.
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Affiliation(s)
- Margherita Maiuri
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Ines Delfino
- Dipartimento di Scienze Ecologiche e Biologiche, Università della Tuscia, Largo dell'Università, I-01100 Viterbo, Italy
| | - Giulio Cerullo
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Cristian Manzoni
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Vladimir Pelmenschikov
- Institut für Chemie, Technische Universität Berlin, Strasse des 17 Juni 135, 10623 Berlin, Germany
| | - Yisong Guo
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213, United States
| | - Hongxin Wang
- Department of Chemistry, University of California, Davis, CA 95616, United States
| | - Leland B Gee
- Department of Chemistry, University of California, Davis, CA 95616, United States
| | - Christie H Dapper
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, United States
| | - William E Newton
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061, United States
| | - Stephen P Cramer
- Department of Chemistry, University of California, Davis, CA 95616, United States; Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States.
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Delfino I, Viola D, Cerullo G, Lepore M. Ultrafast excited-state charge-transfer dynamics in laccase type I copper site. Biophys Chem 2015; 200-201:41-7. [PMID: 25819432 DOI: 10.1016/j.bpc.2015.03.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 03/09/2015] [Accepted: 03/09/2015] [Indexed: 11/27/2022]
Abstract
Femtosecond pump-probe spectroscopy was used to investigate the excited state dynamics of the T1 copper site of laccase from Pleurotus ostreatus, by exciting its 600 nm charge transfer band with a 15-fs pulse and probing over a broad range in the visible region. The decay of the pump-induced ground-state bleaching occurs in a single step and is modulated by clearly visible oscillations. Global analysis of the two-dimensional differential transmission map shows that the excited state exponentially decays with a time constant of 375 fs, thus featuring a decay rate slower than those occurring in quite all the investigated T1 copper site proteins. The ultrashort pump pulse induces a vibrational coherence in the protein, which is mainly assigned to ground state activity, as expected in a system with fast excited state decay. Vibrational features are discussed also in comparison with the traditional resonance Raman spectrum of the enzyme. The results indicate that both excited state dynamics and vibrational modes associated with the T1 Cu laccase charge transfer have main characteristics similar to those of all the T1 copper site-containing proteins. On the other hand, the differences observed for laccase from P. ostreatus further confirm the peculiar hypothesized trigonal T1 Cu site geometry.
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Affiliation(s)
- Ines Delfino
- Dipartimento di Scienze Ecologiche e Biologiche, Università della Tuscia, Largo dell'Università snc, I-01100 Viterbo, Italy.
| | - Daniele Viola
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Giulio Cerullo
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Maria Lepore
- Dipartimento di Medicina Sperimentale, Seconda Università di Napoli, Via Costantinopoli 16, I-80100 Napoli, Italy
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26
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Delfino I, Perna G, Lasalvia M, Capozzi V, Manti L, Camerlingo C, Lepore M. Visible micro-Raman spectroscopy of single human mammary epithelial cells exposed to x-ray radiation. J Biomed Opt 2015; 20:035003. [PMID: 25769498 DOI: 10.1117/1.jbo.20.3.035003] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2014] [Accepted: 02/24/2015] [Indexed: 05/06/2023]
Abstract
A micro-Raman spectroscopy investigation has been performed in vitro on single human mammary epithelial cells after irradiation by graded x-ray doses. The analysis by principal component analysis (PCA) and interval-PCA (i-PCA) methods has allowed us to point out the small differences in the Raman spectra induced by irradiation. This experimental approach has enabled us to delineate radiation-induced changes in protein, nucleic acid, lipid, and carbohydrate content. In particular, the dose dependence of PCA and i-PCA components has been analyzed. Our results have confirmed that micro-Raman spectroscopy coupled to properly chosen data analysis methods is a very sensitive technique to detect early molecular changes at the single-cell level following exposure to ionizing radiation. This would help in developing innovative approaches to monitor radiation cancer radiotherapy outcome so as to reduce the overall radiation dose and minimize damage to the surrounding healthy cells, both aspects being of great importance in the field of radiation therapy.
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Affiliation(s)
- Ines Delfino
- Università della Tuscia, Dipartimento di Scienze Ecologiche e Biologiche, Largo dell'Università snc, Viterbo 01100, Italy
| | - Giuseppe Perna
- Università di Foggia, Dipartimento di Medicina Clinica e Sperimentale, Viale Pinto 1, Foggia 71122, Italy
| | - Maria Lasalvia
- Università di Foggia, Dipartimento di Medicina Clinica e Sperimentale, Viale Pinto 1, Foggia 71122, Italy
| | - Vito Capozzi
- Università di Foggia, Dipartimento di Medicina Clinica e Sperimentale, Viale Pinto 1, Foggia 71122, Italy
| | - Lorenzo Manti
- Università "Federico II," Dipartimento di Fisica, Via Cintia, Napoli 80126, Italy
| | - Carlo Camerlingo
- Consiglio Nazionale delle Ricerche, CNR-SPIN, UdR di Napoli, Via Campi Flegrei 34, Pozzuoli 80078, Italy
| | - Maria Lepore
- Seconda Università di Napoli, Dipartimento di Medicina Sperimentale, Via S.M. Costantinopoli 16, Napoli 80134, Italy
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Delfino I. Light scattering methods for tracking gold nanoparticles aggregation induced by biotin–neutravidin interaction. Biophys Chem 2013; 177-178:7-13. [DOI: 10.1016/j.bpc.2013.03.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 03/04/2013] [Accepted: 03/04/2013] [Indexed: 11/26/2022]
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Delfino I, Portaccio M, Ventura BD, Mita D, Lepore M. Enzyme distribution and secondary structure of sol–gel immobilized glucose oxidase by micro-attenuated total reflection FT-IR spectroscopy. Materials Science and Engineering: C 2013; 33:304-10. [DOI: 10.1016/j.msec.2012.08.044] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2012] [Revised: 08/10/2012] [Accepted: 08/29/2012] [Indexed: 11/27/2022]
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Delfino I, Portaccio M, Della Ventura B, Manzo G, Mita DG, Lepore M. Optical properties of sol-gel immobilized Laccase: a first step for its use in optical biosensing. ACTA ACUST UNITED AC 2012. [DOI: 10.1117/12.921396] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Camerlingo C, Delfino I, Perna G, Capozzi V, Lepore M. Micro-Raman spectroscopy and univariate analysis for monitoring disease follow-up. Sensors (Basel) 2011; 11:8309-22. [PMID: 22164077 PMCID: PMC3231482 DOI: 10.3390/s110908309] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [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: 07/07/2011] [Revised: 08/17/2011] [Accepted: 08/18/2011] [Indexed: 11/16/2022]
Abstract
Micro-Raman spectroscopy is a very promising tool for medical applications, thanks to its sensitivity to subtle changes in the chemical and structural characteristics of biological specimens. To fully exploit these promises, building a method of data analysis properly suited for the case under study is crucial. Here, a linear or univariate approach using a R2 determination coefficient is proposed for discriminating Raman spectra even with small differences. The validity of the proposed approach has been tested using Raman spectra of high purity glucose solutions collected in the 600 to 1,600 cm(-1) region and also from solutions with two known solutes at different concentrations. After this validation step, the proposed analysis has been applied to Raman spectra from oral human tissues affected by Pemphigus Vulgaris (PV), a rare life-threatening autoimmune disease, for monitoring disease follow-up. Raman spectra have been obtained in the wavenumber regions from 1,050 to 1,700 cm(-1) and 2,700 to 3,200 cm(-1) from tissues of patients at different stages of pathology (active PV, under therapy and PV in remission stage) as confirmed by histopathological and immunofluorescence analysis. Differences in the spectra depending on tissue illness stage have been detected at 1,150-1,250 cm(-1) (amide III) and 1,420-1,450 cm(-1) (CH3 deformation) regions and around 1,650 cm(-1) (amide I) and 2,930 cm(-1) (CH3 symmetric stretch). The analysis of tissue Raman spectra by the proposed univariate method has allowed us to effectively differentiate tissues at different stages of pathology.
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Affiliation(s)
- Carlo Camerlingo
- CNR (Consiglio Nazionale delle Ricerche), Istituto di Cibernetica “E. Caianiello”, 80078, Pozzuoli, Italy; E-Mail:
| | - Ines Delfino
- Biophysics and Nanoscience Centre, CNISM, Facoltà di Scienze, Università della Tuscia, 01100, Viterbo, Italy; E-Mail:
| | - Giuseppe Perna
- Dipartimento di Scienze Biomediche, Università di Foggia, 71100, Foggia, Italy; E-Mails: (G.P.); (V.C.)
| | - Vito Capozzi
- Dipartimento di Scienze Biomediche, Università di Foggia, 71100, Foggia, Italy; E-Mails: (G.P.); (V.C.)
| | - Maria Lepore
- Dipartimento di Medicina Sperimentale, Seconda Università di Napoli, 81100, Naples, Italy
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +39-081-566-5839; Fax: +39-081-566-7500
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Delfino I, Cerullo G, Cannistraro S, Manzoni C, Polli D, Dapper C, Newton WE, Guo Y, Cramer SP. Observation of terahertz vibrations in the nitrogenase FeMo cofactor by femtosecond pump-probe spectroscopy. Angew Chem Int Ed Engl 2010; 49:3912-5. [PMID: 20411554 PMCID: PMC3129498 DOI: 10.1002/anie.200906787] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
We have used Impulsive Coherent Vibrational Spectroscopy (ICVS) to study the FeMo-cofactor of nitrogenase from Azotobacter vinelandii as the extracted small molecule ‘FeMoco’. In the ICVS experiment, a 15 fs visible laser pulse pumps the sample to an excited electronic state, and a second <10 fs pulse probes the change in transmission as a function of the time delay. FeMoco was observed to relax to the ground state by a single exponential decay with a time constant of ~200 fs. Superimposed on this relaxation are oscillations caused by the coherent excitation of vibrational modes in both excited and ground electronic states. Fourier transformation reveals the FeMoco vibrational frequencies that are coherently excited by the short laser pulse. The frequencies obtained by the ICVS technique were compared with values from normal mode calculations. The strongest ICVS bands are at 215 and 420 cm−1. The 420 cm−1 band is attributed to Fe-S stretching motion, whereas the 215 cm−1 band, which is the strongest feature in the spectrum, is attributed to a breathing mode of FeMoco. Over the years, nitrogenase and FeMoco have resisted characterization by resonance Raman spectroscopy. The current results demonstrate the promise of ICVS as an alternative probe of FeMoco dynamics.
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Affiliation(s)
- Ines Delfino
- Biophysics & Nanoscience Centre, CNISM, Facoltà di Scienze, Università della Tuscia, Largo dell’Università, I-01100 Viterbo, Italy
| | - Giulio Cerullo
- National Laboratory for Ultrafast and Ultraintense Optical Science-CNR-INFM, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Salvatore Cannistraro
- Biophysics & Nanoscience Centre, CNISM, Facoltà di Scienze, Università della Tuscia, Largo dell’Università, I-01100 Viterbo, Italy
| | - Cristian Manzoni
- National Laboratory for Ultrafast and Ultraintense Optical Science-CNR-INFM, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Dario Polli
- National Laboratory for Ultrafast and Ultraintense Optical Science-CNR-INFM, Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy
| | - Christie Dapper
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061
| | - William E. Newton
- Department of Biochemistry, Virginia Polytechnic Institute & State University, Blacksburg, VA 24061
| | - Yisong Guo
- Department of Applied Science, University of California, Davis, CA 95616
| | - Stephen P. Cramer
- Department of Applied Science, University of California, Davis, CA 95616
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
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Delfino I, Cerullo G, Cannistraro S, Manzoni C, Polli D, Dapper C, Newton W, Guo Y, Cramer S. Observation of Terahertz Vibrations in the Nitrogenase FeMo Cofactor by Femtosecond Pump-Probe Spectroscopy. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200906787] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Delfino I, Manzoni C, Sato K, Dennison C, Cerullo G, Cannistraro S. Ultrafast Pump−Probe Study of Excited-State Charge-Transfer Dynamics in Umecyanin from Horseradish Root. J Phys Chem B 2006; 110:17252-9. [PMID: 16928024 DOI: 10.1021/jp062904y] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have applied femtosecond pump-probe spectroscopy to investigate the excited-state dynamics of umecyanin from horseradish roots, by exciting its 600-nm ligand-to-metal charge-transfer band with a 15-fs pulse and probing over a broad range in the visible region. The decay of the pump-induced ground-state bleaching is modulated by clearly visible oscillations and occurs exponentially with a time constant depending on the observed spectral component of the transmission difference signal, ranging from 270 fs up to 700 fs. The slower decaying process characterizes the spectral component corresponding to the metal-to-ligand charge-transfer transition. The excited-state decay rate is significantly lower than in other blue copper proteins, probably because of the larger energy gap between ligand- and metal-based orbitals in umecyanin. Wavelength dependence of the recovery times could be due to either the excitation of several transitions or the occurrence of intramolecular vibrational relaxation within the excited state. We also find evidence of a hot ground-state absorption, at 700 nm, persisting for several picoseconds. The vibrational coherence induced by the ultrashort pump pulse allows vibrational activity to be observed, mainly in the ground state, as expected in a system with fast excited-state decay. However, we find evidence of a rapidly damped oscillation, which we assign to the excited state. Finally, the Fourier transform of the oscillatory component of the signal presents additional bands in the low-frequency region which are assigned to collective motions of the protein.
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Affiliation(s)
- Ines Delfino
- Biophysics and Nanoscience Centre, CNISM - Università della Tuscia, I-01100 Viterbo, Italy
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Delfino I, Sato K, Harrison MD, Andolfi L, Bizzarri AR, Dennison C, Cannistraro S. Optical Spectroscopic Investigation of the Alkaline Transition in Umecyanin from Horseradish Root†. Biochemistry 2005; 44:16090-7. [PMID: 16331969 DOI: 10.1021/bi051702+] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Umecyanin (UMC) from horseradish root belongs to the stellacyanin subclass of the phytocyanins, a family of plant cupredoxins. The protein possesses the typical type-1 His(2)Cys equatorial ligand set at its mononuclear copper site but has an axial Gln ligand in place of the usual weakly coordinated Met of the plantacyanins, uclacyanins, and most other cupredoxins. UMC exhibits, like other phytocyanins, altered visible, EPR, and paramagnetic (1)H NMR spectra at elevated pH values and also a modified reduction potential. This alkaline transition occurs with a pK(a) of approximately 10 [Dennison, C., Lawler, A. T. (2001) Biochemistry 40, 3158-3166]. In this study, we investigate the alkaline transition by complementary optical spectroscopic techniques. The contemporary use of absorption, fluorescence, dynamic light scattering, and resonance Raman spectroscopy allows us to demonstrate that the alkaline transition induces a reorganization of the protein and that the overall size of UMC increases, but protein aggregation does not occur. The transition does not have a dramatic influence on the active-site environment of UMC, but there are subtle alterations in the Cu site geometry. Direct evidence for the strengthening of a Cu-N(His) bond is presented, which is in agreement with the hypothesis that the deprotonation of the N(epsilon2)H moiety of one of the His ligands is the cause of the alkaline transition. A weakening of the Cu-S(Cys) bond is also observed which, along with a weakened axial interaction, must be due to the enhanced Cu-N(His) interaction.
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Affiliation(s)
- Ines Delfino
- Biophysics and Nanoscience Centre, INFM-CNISM, Dipartimento Scienze Ambientali, Università della Tuscia, Largo dell'Università, I-01100 Viterbo, Italy
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Delfino I, Piccolo C, Lepore M. Experimental study of short- and long-time diffusion regimes of spherical particles in carboxymethylcellulose solutions. Eur Polym J 2005. [DOI: 10.1016/j.eurpolymj.2005.03.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Delfino I, Bizzarri AR, Cannistraro S. Single-molecule detection of yeast cytochrome c by Surface-Enhanced Raman Spectroscopy. Biophys Chem 2005; 113:41-51. [PMID: 15617809 DOI: 10.1016/j.bpc.2004.07.006] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2004] [Revised: 07/07/2004] [Accepted: 07/10/2004] [Indexed: 11/17/2022]
Abstract
The giant enhancement of Raman signal near silver colloidal nanoparticles is exploited to study the Raman spectrum of Cytochrome c from Saccharomyces cerevisiae (Yeast Cytochrome c--YCc) in the limit of single-molecule. The investigation is performed on proteins both in solution and immobilised onto a glass slide using a quasi resonant laser line as exciting source with low excitation intensity. In both cases, spectra acquired at different times exhibit dramatic temporal fluctuations in both the total spectrum and in the specific line intensity, even though averaging of several individual spectra reproduces the main Raman features of bulk YCc. Analysis of the spectral intensity fluctuations from solutions reveals a multimodal distribution of some specific Raman lines, consistent with the approaching of single molecule regime. Among other results, the statistical analysis of the spectra from immobilised samples seems to indicate dynamical processes involving the reorientational of the heme with respect to the metal surface.
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Affiliation(s)
- Ines Delfino
- Biophysics and Nanoscience Centre, INFM, Dipartimento Scienze Ambientali-Università della Tuscia, Viterbo 01100, Italia
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Esposito R, Nicola SD, Lepore M, Delfino I, Indovina PL. A perturbation approach to characterize absorptive inclusions in diffusing media by time-resolved contrast measurements. ACTA ACUST UNITED AC 2004. [DOI: 10.1088/1464-4258/6/7/013] [Citation(s) in RCA: 3] [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: 11/12/2022]
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Chernomordik V, Gandjbakhche A, Lepore M, Esposito R, Delfino I. Depth dependence of the analytical expression for the width of the point spread function (spatial resolution) in time-resolved transillumination. J Biomed Opt 2001; 6:441-445. [PMID: 11728203 DOI: 10.1117/1.1412225] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2000] [Revised: 04/03/2001] [Accepted: 04/17/2001] [Indexed: 05/23/2023]
Abstract
Simple analytical expressions for the point spread function (PSF) at different depths can save computation time and improve the performance of inverse algorithms for optical imaging. In particular, application of such formulas simplifies quantification of the optical characteristics of tissue abnormalities inside highly scattering media. Earlier it was shown within the random walk theory framework that the PSF for time-resolved transillumination imaging through a highly scattering slab is well represented by a Gaussian. We have experimentally validated a simple formula of the random walk model for the effective width of this Gaussian, as a function of time delay, at different depths of the target. Presented analysis of published experimental data, concerning effective width of the PSF, for a slab of considerably smaller thickness also demonstrates good agreement between the data and predictions of our model. This PSF width determines spatial resolution of the time-resolved imaging and is widely discussed in the literature.
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Affiliation(s)
- V Chernomordik
- National Institute of Child Health and Development, National Institutes of Health, Bldg. 12A, Rm 2041, 9000 Rockville Pike, Bethesda, MD 20892-5626, USA.
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Delfino I, Lepore M, Indovina PL. Experimental tests of different solutions to the diffusion equation for optical characterization of scattering media by time-resolved transmittance. Appl Opt 1999; 38:4228-4236. [PMID: 18323905 DOI: 10.1364/ao.38.004228] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A detailed investigation of the use of time-resolved trasmittance for the optical characterization of scattering media by use of different analytical solutions to the diffusion equation has been performed. A femtosecond Ti:sapphire laser working at 800 nm and a streak camera with a time resolution of a few picoseconds were employed. Different latex and Intralipid solutions as well as biological samples were investigated. Reduced scattering coefficients were evaluated, and good agreement with the Mie predictions was found. An estimation of the order of magnitude of the absorption coefficient was obtained for the low-absorbance samples examined. These studies confirm experimentally that time-resolved trasmittance can be employed usefully for evaluating s values of thick scattering samples when a proper theoretical description that takes into account realistic boundary conditions is used.
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Affiliation(s)
- I Delfino
- Dipartimento di Scienze Fisiche, Istituto Nazionale per la Fisica della Materia, Università di Napoli Federico II, 80100 Napoli, Italy.
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