1
|
Funari R, Della Ventura B, Altucci C, Offenhäusser A, Mayer D, Velotta R. Single Molecule Characterization of UV-Activated Antibodies on Gold by Atomic Force Microscopy. Langmuir 2016; 32:8084-91. [PMID: 27444884 DOI: 10.1021/acs.langmuir.6b02218] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The interaction between proteins and solid surfaces can influence their conformation and therefore also their activity and affinity. These interactions are highly specific for the respective combination of proteins and solids. Consequently, it is desirable to investigate the conformation of proteins on technical surfaces, ideally at single molecule level, and to correlate the results with their activity. This is in particular true for biosensors where the conformation-dependent target affinity of an immobilized receptor determines the sensitivity of the sensor. Here, we investigate for the first time the immobilization and orientation of antibodies (Abs) photoactivated by a photonic immobilization technique (PIT), which has previously demonstrated to enhance binding capabilities of antibody receptors. The photoactivated immunoglobulins are immobilized on ultrasmooth template stripped gold films and investigated by atomic force microscopy (AFM) at the level of individual molecules. The observed protein orientations are compared with results of nonactivated antibodies adsorbed on similar gold films and mica reference samples. We find that the behavior of Abs is similar for mica and gold when the protein are not treated (physisorption), whereas smaller contact area and larger heights are measured when Abs are treated (PIT). This is explained by assuming that the activated antibodies tend to be more upright compared with nonirradiated ones, thereby providing a better exposure of the binding sites. This finding matches the observed enhancement of Abs binding efficiency when PIT is used to functionalize gold surface of QCM-based biosensors.
Collapse
Affiliation(s)
- R Funari
- Department of Physics Ettore Pancini, Università di Napoli Federico II , via Cintia, I-80126 Napoli, Italy
| | - B Della Ventura
- Department of Physics Ettore Pancini, Università di Napoli Federico II , via Cintia, I-80126 Napoli, Italy
| | - C Altucci
- Department of Physics Ettore Pancini, Università di Napoli Federico II , via Cintia, I-80126 Napoli, Italy
| | - A Offenhäusser
- Peter Grünberg Institute (PGI-8) and Institute of Complex Systems (ICS-8), Forschungszentrum Jülich GmbH , 52428 Jülich, Germany
| | - D Mayer
- Peter Grünberg Institute (PGI-8) and Institute of Complex Systems (ICS-8), Forschungszentrum Jülich GmbH , 52428 Jülich, Germany
| | - R Velotta
- Department of Physics Ettore Pancini, Università di Napoli Federico II , via Cintia, I-80126 Napoli, Italy
| |
Collapse
|
2
|
Ohshima-Hosoyama S, Simmons HA, Goecks N, Joers V, Swanson CR, Bondarenko V, Velotta R, Brunner K, Wood LD, Hruban RH, Emborg ME. A monoclonal antibody-GDNF fusion protein is not neuroprotective and is associated with proliferative pancreatic lesions in parkinsonian monkeys. PLoS One 2012; 7:e39036. [PMID: 22745701 PMCID: PMC3380056 DOI: 10.1371/journal.pone.0039036] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2012] [Accepted: 05/15/2012] [Indexed: 01/12/2023] Open
Abstract
Glial cell line derived neurotrophic factor (GDNF) is a neurotrophic factor that has neuroprotective effects in animal models of Parkinson’s disease (PD) and has been proposed as a PD therapy. GDNF does not cross the blood brain barrier (BBB), and requires direct intracerebral delivery to be effective. Trojan horse technology, in which GDNF is coupled to a monoclonal antibody (mAb) against the human insulin receptor (HIR), has been proposed to allow GDNF BBB transport (ArmaGen Technologies Inc.). In this study we tested the feasibility of HIRMAb-GDNF to induce neuroprotection in parkinsonian monkeys, as well as its tolerability and safety. Adult rhesus macaques were assessed throughout the study with a clinical rating scale, a computerized fine motor skills task and general health evaluations. Following baseline measurements, the animals received a unilateral intracarotid artery MPTP injection. Seven days later the animals were evaluated, matched according to disability and blindly assigned to receive twice a week iv. treatments (vehicle, 1 or 5 mg/kg HIRmAb-GDNF) for a period of three months. HIRmAb-GDNF did not improve parkinsonian motor symptoms and induced a dose-dependent hypersensitivity reaction. Quantification of dopaminergic striatal optical density and stereological nigral cell counts did not demonstrate differences between treatment groups. Focal pancreatic acinar to ductular metaplasia (ADM) was noted in four of seven animals treated with 1 mg/kg HIRmAb-GDNF; two of four with ADM also had focal pancreatic intraepithelial neoplasia 1B (PanIN-1B) lesions. Minimal to mild, focal to multifocal, nonsuppurative myocarditis was noted in all animals in the 5 mg/kg treatment group. Our results demonstrate that HIRmAb-GDNF dosing in a monkey model of PD is not an effective neuroprotective strategy and may present serious health risks that should be considered when planning future use of the IR antibody as a carrier, or of any systemic treatment of a GDNF-containing molecule.
Collapse
Affiliation(s)
- Sachiko Ohshima-Hosoyama
- Preclinical Parkinson’s Research Program, Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Heather A. Simmons
- Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Nichole Goecks
- Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Valerie Joers
- Preclinical Parkinson’s Research Program, Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
- Neuroscience Training Program, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Christine R. Swanson
- Preclinical Parkinson’s Research Program, Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
- Neuroscience Training Program, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Viktoriya Bondarenko
- Preclinical Parkinson’s Research Program, Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Rebecca Velotta
- Preclinical Parkinson’s Research Program, Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Kevin Brunner
- Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Laura D. Wood
- Department of Pathology, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Ralph H. Hruban
- Department of Pathology, The Sol Goldman Pancreatic Cancer Research Center, The Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
| | - Marina E. Emborg
- Preclinical Parkinson’s Research Program, Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
- Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
- Neuroscience Training Program, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
- Department of Medical Physics, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
- * E-mail:
| |
Collapse
|
3
|
Torres R, Siegel T, Brugnera L, Procino I, Underwood JG, Altucci C, Velotta R, Springate E, Froud C, Turcu ICE, Ivanov MY, Smirnova O, Marangos JP. Extension of high harmonic spectroscopy in molecules by a 1300 nm laser field. Opt Express 2010; 18:3174-3180. [PMID: 20174156 DOI: 10.1364/oe.18.003174] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The emerging techniques of molecular spectroscopy by high order harmonic generation have hitherto been conducted only with Ti:Sapphire lasers which are restricted to molecules with high ionization potentials. In order to gain information on the molecular structure, a broad enough range of harmonics is required. This implies using high laser intensities which would saturate the ionization of most molecular systems of interest, e.g. organic molecules. Using a laser at 1300 nm, we are able to extend the technique to molecules with relatively low ionization potentials (approximately 11 eV), observing wide harmonic spectra reaching up to 60 eV. This energy range improves spatial resolution of the high harmonic spectroscopy to the point where interference minima in harmonic spectra of N(2)O and C(2)H(2) can be observed.
Collapse
Affiliation(s)
- R Torres
- Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2BW, UK
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Xia J, Altucci C, Amoruso S, Bruzzese R, Velotta R, Wang X. Generation of high energy, 30 fs pulses at 527 nm by hollow-fiber compression technique. Opt Express 2008; 16:3527-3536. [PMID: 18542445 DOI: 10.1364/oe.16.003527] [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] [Indexed: 05/26/2023]
Abstract
The compression of 300-fs-long, chirp-free laser pulses at 527 nm down to 30 fs is reported. The laser pulses, originated from a frequency-doubled, mode-locked Nd:glass laser, were compressed by a 0.7-m-long, 150-microm-bore-diameter, argon-filled hollow fiber, and a pair of SF10 prisms with a final energy of 160 microJ. These are the shortest, high energy pulses ever produced by direct pulse compression at the central wavelength of 527 nm. The spectral broadening of the pulses propagating inside the hollow fiber was experimentally examined for various filling-gas pressures and input pulse energies. The spectral width of the pulses was broadened up to 25 nm, and 27 nm for argon- and krypton-filled hollow fiber, respectively, at a gas pressure lower than 2 bar. The physical limitations of the hollow-fiber pulse compression technique applied in the visible range are also studied.
Collapse
Affiliation(s)
- J Xia
- Università di Napoli Federico II, via Cintia, 26 Ed. G - 80126 Napoli, Italy
| | | | | | | | | | | |
Collapse
|
5
|
Procino I, Velotta R, Altucci C, Amoruso S, Bruzzese R, Wang X, Tosa V, Sansone G, Vozzi C, Nisoli M. Hollow-fiber compression of visible, 200 fs laser pulses to 40 fs pulse duration. Opt Lett 2007; 32:1866-8. [PMID: 17603596 DOI: 10.1364/ol.32.001866] [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: 05/16/2023]
Abstract
We demonstrate the use of a very simple, compact, and versatile method, based on the hollow-fiber compression technique, to shorten the temporal length of visible laser pulses of 100-300 fs to pulse durations shorter than approximately 50 fs. In particular, 200 fs, frequency-doubled, Nd:glass laser pulses (527 nm) were spectrally broadened to final bandwidths as large as 25 nm by nonlinear propagation through an Ar-filled hollow fiber. A compact, dispersive, prism-pair compressor was then used to produce as short as 40 fs, 150 microJ pulses. A very satisfactory agreement between numerical simulations and measurements is found.
Collapse
Affiliation(s)
- I Procino
- Consorzio Nazionale Interuniversatario per le Scienze Fisiche della Materia, Coherentia Consiglio Nazionale delle Ricerche, Dipartimento di Scienze Fisiche, Università Federico II di Napoli, via Cintia, 80126 Napoli, Italy
| | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Torres R, Kajumba N, Underwood JG, Robinson JS, Baker S, Tisch JWG, de Nalda R, Bryan WA, Velotta R, Altucci C, Turcu ICE, Marangos JP. Probing orbital structure of polyatomic molecules by high-order harmonic generation. Phys Rev Lett 2007; 98:203007. [PMID: 17677693 DOI: 10.1103/physrevlett.98.203007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2006] [Indexed: 05/16/2023]
Abstract
The effects of electronic structure and symmetry are observed in laser driven high-order harmonic generation for laser aligned conjugated polyatomic molecular systems. The dependence of the harmonic yield on the angle between the molecular axis and the polarization of the driving laser field is seen to contain the fingerprint of the highest occupied molecular orbitals in acetylene and allene, a good quantitative agreement with calculations employing the strong field approximation was found. These measurements support the extension of the recently proposed molecular orbital imaging techniques beyond simple diatomic molecules to larger molecular systems.
Collapse
Affiliation(s)
- R Torres
- Blackett Laboratory, Imperial College London, London SW7 2BW, United Kingdom
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Sansone G, Benedetti E, Calegari F, Vozzi C, Avaldi L, Flammini R, Poletto L, Villoresi P, Altucci C, Velotta R, Stagira S, De Silvestri S, Nisoli M. Isolated Single-Cycle Attosecond Pulses. Science 2006; 314:443-6. [PMID: 17053142 DOI: 10.1126/science.1132838] [Citation(s) in RCA: 355] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
We generated single-cycle isolated attosecond pulses around approximately 36 electron volts using phase-stabilized 5-femtosecond driving pulses with a modulated polarization state. Using a complete temporal characterization technique, we demonstrated the compression of the generated pulses for as low as 130 attoseconds, corresponding to less than 1.2 optical cycles. Numerical simulations of the generation process show that the carrier-envelope phase of the attosecond pulses is stable. The availability of single-cycle isolated attosecond pulses opens the way to a new regime in ultrafast physics, in which the strong-field electron dynamics in atoms and molecules is driven by the electric field of the attosecond pulses rather than by their intensity profile.
Collapse
Affiliation(s)
- G Sansone
- National Laboratory for Ultrafast and Ultraintense Optical Science-CNR-Istituto Nazionale per la Fisica della Materia, Department of Physics, Politecnico, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Di Palma T, Apicella B, Armenante M, Velotta R, Wang X, Spinelli N. Ion kinetic energy distributions and cross sections for the electron impact ionization of ethyl tert-butyl ether. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.09.026] [Citation(s) in RCA: 2] [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: 10/25/2022]
|
9
|
Vozzi C, Calegari F, Benedetti E, Caumes JP, Sansone G, Stagira S, Nisoli M, Torres R, Heesel E, Kajumba N, Marangos JP, Altucci C, Velotta R. Controlling two-center interference in molecular high harmonic generation. Phys Rev Lett 2005; 95:153902. [PMID: 16241726 DOI: 10.1103/physrevlett.95.153902] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2005] [Indexed: 05/05/2023]
Abstract
We experimentally investigate the process of intramolecular quantum interference in high-order harmonic generation in impulsively aligned CO2 molecules. The recombination interference effect is clearly seen through the order dependence of the harmonic yield in an aligned sample. The experimental results can be well modeled assuming that the effective de Broglie wavelength of the returning electron wave is not significantly altered by the Coulomb field of the molecular ion. We demonstrate that such interference effects can be effectively controlled by changing the ellipticity of the driving laser field.
Collapse
Affiliation(s)
- C Vozzi
- Dipartimento di Fisica, Politecnico, National Laboratory for Ultrafast and Ultraintense Optical Science-CNR-INFM, Milano, Italy
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Di Palma T, Apicella B, Armenante M, Velotta R, Wang X, Spinelli N. Corrigendum to ‘Dissociative electron impact ionization of methyl tert-butyl ether: Total ionization cross-section and kinetic energy distributions’ [Chem. Phys. Lett. 400 (2004) 191–195]. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.07.097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
11
|
Di Palma T, Apicella B, Armenante M, Velotta R, Wang X, Spinelli N. Dissociative electron impact ionization of methyl tert-butyl ether: total ionization cross-section and kinetic energy distributions. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.10.106] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
12
|
Lein M, Hay N, Velotta R, Marangos JP, Knight PL. Role of the intramolecular phase in high-harmonic generation. Phys Rev Lett 2002; 88:183903. [PMID: 12005685 DOI: 10.1103/physrevlett.88.183903] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2001] [Indexed: 05/23/2023]
Abstract
We study numerically the generation of high-order harmonics by two-center molecules for arbitrary angles between the molecular axis and the laser polarization axis. For fixed angle, the harmonic spectrum exhibits a minimum at a frequency which is independent of the laser parameters. The amplitude of each harmonic is strongly angle dependent, and a pronounced minimum is found at the same angle where a sudden jump in the harmonic phase occurs. By calculating the spatial dependence of the harmonic amplitudes and phases, we are able to explain these effects in terms of interfering contributions from various regions within the molecule.
Collapse
Affiliation(s)
- M Lein
- Blackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2BW, United Kingdom
| | | | | | | | | |
Collapse
|
13
|
Wang X, Amoruso S, Bruzzese R, Spinelli N, Tortora A, Velotta R, Ferdeghini C, Grassano G, Ramadan W. Optical spectroscopy diagnostics and thin film deposition of laser ablated rare earth–Ni2B2C plasma plumes. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(01)01482-8] [Citation(s) in RCA: 9] [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]
|
14
|
Velotta R, Bartoli B, Capobianco R, Fiorani L, Spinelli N. Analysis of the receiver response in lidar measurements. Appl Opt 1998; 37:6999-7007. [PMID: 18301518 DOI: 10.1364/ao.37.006999] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We report on the calculation of the effective telescope area in lidar applications by a ray-tracing approach. This method allows one to consider the true experimental working conditions and hence to obtain accurate values of the effective telescope area as a function of the height. This in turn allows the retrieval of the signal from the ranges where the overlap function is not constant (e.g., lower ranges), thus increasing the useful range interval. Moreover, we show that the spherical mirrors are more appropriate than the parabolic ones for most of the lidar measurements, although a particular alignment procedure, such as the one we describe, must be used.
Collapse
|
15
|
Velotta R, Avaldi L, Camilloni R, Giammanco F, Spinelli N, Stefani G. Direct measurement of macroscopic electric fields produced by collective effects in electron-impact experiments. Phys Rev A 1996; 54:2482-2485. [PMID: 9913744 DOI: 10.1103/physreva.54.2482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
16
|
Di Girolamo P, Pappalardo G, Spinelli N, Berardi V, Velotta R. Lidar observations of the stratospheric aerosol layer over southern Italy in the period 1991-1995. ACTA ACUST UNITED AC 1996. [DOI: 10.1029/96jd01172] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
17
|
Berardi V, Amoruso S, Spinelli N, Armenante M, Velotta R, Fuso F, Allegrini M, Arimondo E. Covariance mapping of charged species evolution in YBa2Cu3O7−δ laser ablation. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0168-1176(95)04151-a] [Citation(s) in RCA: 5] [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: 10/18/2022]
|
18
|
Giammanco F, Armenante M, Berardi V, Spinelli N, Velotta R. Continuous-electron-beam focusing induced by collective plasma interactions in D2 and H2. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1993; 47:1960-1967. [PMID: 9960216 DOI: 10.1103/physreve.47.1960] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
19
|
Berardi V, Spinelli N, Velotta R, Armenante M, Zecca A. Experimental analysis of H3- and D3-molecule autoionization. Phys Rev A 1993; 47:986-993. [PMID: 9909019 DOI: 10.1103/physreva.47.986] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|