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Price A, Kim T, Green O, Wittland E, Marko A, Spraker M, Kim H, Rodriguez V, Robinson C, Hugo G, Mutic S, Henke L. Development of and FMEA-based Risk Minimization for a Novel Tele-adaptive Radiotherapy System. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.2229] [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: 10/23/2022]
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Henke L, Green O, Price A, Marko A, Wittland E, Kim H, Pryser E, Laugeman E, Mutic S, Hugo G, Cai B. Feasibility of AI-assisted CBCT-guided Stereotactic Online Adaptive Radiotherapy (CT-STAR) for Upper Abdominal SBRT: Results of a Prospective in Silico Clinical Trial. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.856] [Citation(s) in RCA: 1] [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: 11/24/2022]
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Cheruku RR, Cacaccio J, Durrani FA, Tabaczynski WA, Watson R, Marko A, Kumar R, El-Khouly MES, Missert JR, Yao R, Sajjad M, Chandra D, Guru K, Pandey RK. Epidermal Growth Factor Receptor-Targeted Multifunctional Photosensitizers for Bladder Cancer Imaging and Photodynamic Therapy. J Med Chem 2019; 62:2598-2617. [PMID: 30776232 PMCID: PMC10029094 DOI: 10.1021/acs.jmedchem.8b01927] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The in vitro and in vivo anticancer activity of iodinated photosensitizers (PSs) with and without an erlotinib moiety was investigated in UMUC3 [epidermal growth factor (EGFR)-positive] and T24 (EGFR-low) cell lines and tumored mice. Both the erlotinib-conjugated PSs 3 and 5 showed EGFR target specificity, but the position-3 erlotinib-PS conjugate 3 demonstrated lower photodynamic therapy efficacy than the corresponding non-erlotinib analogue 1, whereas the conjugate 5 containing an erlotinib moiety at position-17 of the PS showed higher tumor uptake and long-term tumor cure (severe combined immunodeficient mice bearing UMUC3 tumors). PS-erlotinib conjugates in the absence of light were ineffective in vitro and in vivo, but robust apoptotic and necrotic cell death was observed in bladder cancer cells after exposing them to a laser light at 665 nm. In contrast to 18F-fluorodeoxyglucose, a positron emission tomography agent, the position-17 erlotinib conjugate (124I-analogue 6) showed enhanced UMUC3 tumor contrast even at a low imaging dose of 15 μCi/mouse.
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Affiliation(s)
- Ravindra R. Cheruku
- Photodynamic Therapy Center, Cell Stress Biology, Roswell
Park Comprehensive Cancer Center, Buffalo, NY, 14263
| | - Joseph Cacaccio
- Photodynamic Therapy Center, Cell Stress Biology, Roswell
Park Comprehensive Cancer Center, Buffalo, NY, 14263
| | - Farukh A. Durrani
- Photodynamic Therapy Center, Cell Stress Biology, Roswell
Park Comprehensive Cancer Center, Buffalo, NY, 14263
- Photolitec, LLC, 73 High Street, Buffalo, NY 14226
| | - Walter A. Tabaczynski
- Photodynamic Therapy Center, Cell Stress Biology, Roswell
Park Comprehensive Cancer Center, Buffalo, NY, 14263
| | - Ramona Watson
- Photodynamic Therapy Center, Cell Stress Biology, Roswell
Park Comprehensive Cancer Center, Buffalo, NY, 14263
| | - Aimee Marko
- Photolitec, LLC, 73 High Street, Buffalo, NY 14226
| | - Rahul Kumar
- Department of Pharmacology, Roswell Park Comprehensive
Cancer Center, Buffalo, NY, 14263
| | | | - Joseph R. Missert
- Photodynamic Therapy Center, Cell Stress Biology, Roswell
Park Comprehensive Cancer Center, Buffalo, NY, 14263
| | - Rutao Yao
- Department of Nuclear Medicine, SUNY, Buffalo, NY
14221
| | | | - Dhyan Chandra
- Department of Pharmacology, Roswell Park Comprehensive
Cancer Center, Buffalo, NY, 14263
| | - Khurshid Guru
- Department of Urology, Roswell Park Comprehensive Cancer
Center, Buffalo, NY, 14263
| | - Ravindra K Pandey
- Photodynamic Therapy Center, Cell Stress Biology, Roswell
Park Comprehensive Cancer Center, Buffalo, NY, 14263
- Corresponding author: Professor Ravindra K Pandey,
Ph.D., , Phone:
716-845-3203
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Grytz CM, Kazemi S, Marko A, Cekan P, Güntert P, Sigurdsson ST, Prisner TF. Determination of helix orientations in a flexible DNA by multi-frequency EPR spectroscopy. Phys Chem Chem Phys 2018; 19:29801-29811. [PMID: 29090294 DOI: 10.1039/c7cp04997h] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Distance measurements are performed between a pair of spin labels attached to nucleic acids using Pulsed Electron-Electron Double Resonance (PELDOR, also called DEER) spectroscopy which is a complementary tool to other structure determination methods in structural biology. The rigid spin label Ç, when incorporated pairwise into two helical parts of a nucleic acid molecule, allows the determination of both the mutual orientation and the distance between those labels, since Ç moves rigidly with the helix to which it is attached. We have developed a two-step protocol to investigate the conformational flexibility of flexible nucleic acid molecules by multi-frequency PELDOR. In the first step, a library with a broad collection of conformers, which are in agreement with topological constraints, NMR restraints and distances derived from PELDOR, was created. In the second step, a weighted structural ensemble of these conformers was chosen, such that it fits the multi-frequency PELDOR time traces of all doubly Ç-labelled samples simultaneously. This ensemble reflects the global structure and the conformational flexibility of the two-way DNA junction. We demonstrate this approach on a flexible bent DNA molecule, consisting of two short helical parts with a five adenine bulge at the center. The kink and twist motions between both helical parts were quantitatively determined and showed high flexibility, in agreement with a Förster Resonance Energy Transfer (FRET) study on a similar bent DNA motif. The approach presented here should be useful to describe the relative orientation of helical motifs and the conformational flexibility of nucleic acid structures, both alone and in complexes with proteins and other molecules.
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Affiliation(s)
- C M Grytz
- Institute of Physical and Theoretical Chemistry, Goethe University, Max-von-Laue-Str. 7, 60438 Frankfurt am Main, Germany.
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Saenz C, Cheruku RR, Ohulchanskyy TY, Joshi P, Tabaczynski WA, Missert JR, Chen Y, Pera P, Tracy E, Marko A, Rohrbach D, Sunar U, Baumann H, Pandey RK. Structural and Epimeric Isomers of HPPH [3-Devinyl 3-{1-(1-hexyloxy) ethyl}pyropheophorbide-a]: Effects on Uptake and Photodynamic Therapy of Cancer. ACS Chem Biol 2017; 12:933-946. [PMID: 28165706 DOI: 10.1021/acschembio.7b00023] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The tetrapyrrole structure of porphyrins used as photosentizing agents is thought to determine uptake and retention by malignant epithelial cancer cells. To assess the contribution of the oxidized state of individual rings to these cellular processes, bacteriochlorophyll a was converted into the ring "D" reduced 3-devinyl-3-[1-(1-hexyloxy)ethyl]pyropheophorbide-a (HPPH) and the corresponding ring "B" reduced isomer (iso-HPPH). The carboxylic acid analogs of both ring "B" and ring "D" reduced isomers showed several-fold higher accumulation into the mitochondria and endoplasmic reticulum by primary culture of human lung and head and neck cancer cells than the corresponding methyl ester analogs that localize primarily to granular vesicles and to a lesser extent to mitochondria. However, long-term cellular retention of these compounds exhibited an inverse relationship with tumor cells generally retaining better the methyl-ester derivatives. In vivo distribution and tumor uptake was evaluated in the isogenic model of BALB/c mice bearing Colon26 tumors using the respective 14C-labeled analogs. Both carboxylic acid derivatives demonstrated similar intracellular localization and long-term tumor cure with no significant skin phototoxicity. PDT-mediated tumor action involved vascular damage, which was confirmed by a reduction in blood flow and immunohistochemical assessment of damage to the vascular endothelium. The HPPH stereoisomers (epimers) showed identical uptake (in vitro & in vivo), intracellular retention and photoreaction.
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Affiliation(s)
| | | | - Tymish Y. Ohulchanskyy
- College of Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong, China 518060
- Institute for Lasers, Photonics and Biophotonics, SUNY at Buffalo, Buffalo, New York 14260, United States
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Grytz CM, Marko A, Cekan P, Sigurdsson ST, Prisner TF. Flexibility and conformation of the cocaine aptamer studied by PELDOR. Phys Chem Chem Phys 2016; 18:2993-3002. [PMID: 26740459 DOI: 10.1039/c5cp06158j] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The cocaine aptamer is a DNA three-way junction that binds cocaine at its helical junction. We studied the global conformation and overall flexibility of the aptamer in the absence and presence of cocaine by pulsed electron-electron double resonance (PELDOR) spectroscopy, also called double electron-electron resonance (DEER). The rigid nitroxide spin label Ç was incorporated pairwise into two helices of the aptamer. Multi-frequency 2D PELDOR experiments allow the determination of the mutual orientation and the distances between two Çs. Since Ç is rigidly attached to double-stranded DNA, it directly reports on the aptamer dynamics. The cocaine-bound and the non-bound states could be differentiated by their conformational flexibility, which decreases upon binding to cocaine. We observed a small change in the width and mean value of the distance distribution between the two spin labels upon cocaine binding. Further structural insights were obtained by investigating the relative orientation between the two spin-labeled stems of the aptamer. We determined the bend angle between this two stems. By combining the orientation information with a priori knowledge about the secondary structure of the aptamer, we obtained a molecular model describing the global folding and flexibility of the cocaine aptamer.
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Affiliation(s)
- C M Grytz
- Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University, 60438 Frankfurt am Main, Max-von-Laue-Str. 9, Hessen, Germany.
| | - A Marko
- Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University, 60438 Frankfurt am Main, Max-von-Laue-Str. 9, Hessen, Germany.
| | - P Cekan
- University of Iceland, Department of Chemistry, Science Institute, Dunhaga 3, 107 Reykjavik, Iceland.
| | - S Th Sigurdsson
- University of Iceland, Department of Chemistry, Science Institute, Dunhaga 3, 107 Reykjavik, Iceland.
| | - T F Prisner
- Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University, 60438 Frankfurt am Main, Max-von-Laue-Str. 9, Hessen, Germany.
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Garafova A, Penesova A, Cizmarova E, Marko A, Vlcek M, Jezova D. Cardiovascular and sympathetic responses to a mental stress task in young patients with hypertension and/or obesity. Physiol Res 2015; 63:S459-67. [PMID: 25669677 DOI: 10.33549/physiolres.932931] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Present study was aimed to investigate sympathetic responses to mental stress with hypothesis that the presence of obesity in patients with hypertension has a modifying effect. Young male subjects, 8 with hypertension grade I, with BMI 25 kg/m(2) (HT), 10 with hypertension grade I, and BMI 30 kg/m(2) (HT OB), 14 healthy controls with BMI 30 kg/m(2) (OB), and 13 healthy controls with BMI 25 kg/m(2) (C) underwent the Stroop test. ECG was recorded continuously to evaluate heart rate variability (HRV). Blood pressure (BP) and catecholamine concentrations were measured at baseline, at the end of mental stress test and 15 min thereafter. Patients with HT demonstrated increased adrenaline concentrations and enhanced stress-induced noradrenaline release compared to that in healthy controls. In obese subjects, stress-induced increase of systolicBP was lower compared to lean individuals. Stress exposure induced a significant rise in the low frequency power component of HRV, however the increase was lower in the HT OB group compared to C. Obesity in patients with hypertension did not lead to a different reaction in comparison with lean hypertensive subjects. The present data demonstrate higher sympathoadrenal activity in early-stage of hypertension. Obesity is connected with higher resting systolicBP and modifies the HRV response to mental stress.
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Affiliation(s)
- A Garafova
- Laboratory of Human Endocrinology, Institute of Experimental Endocrinology, Slovak Academy of Sciences, Bratislava, Slovak Republic.
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Akhmetzyanov D, Schöps P, Marko A, Kunjir NC, Sigurdsson ST, Prisner TF. Pulsed EPR dipolar spectroscopy at Q- and G-band on a trityl biradical. Phys Chem Chem Phys 2015; 17:24446-51. [PMID: 26339694 DOI: 10.1039/c5cp03671b] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Pulsed electron paramagnetic resonance (EPR) spectroscopy is a valuable technique for the precise determination of distances between paramagnetic spin labels that are covalently attached to macromolecules. Nitroxides have commonly been utilised as paramagnetic tags for biomolecules, but trityl radicals have recently been developed as alternative spin labels. Trityls exhibit longer electron spin relaxation times and higher stability than nitroxides under in vivo conditions. So far, trityl radicals have only been used in pulsed EPR dipolar spectroscopy (PDS) at X-band (9.5 GHz), Ku-band (17.2 GHz) and Q-band (34 GHz) frequencies. In this study we investigated a trityl biradical by PDS at Q-band (34 GHz) and G-band (180 GHz) frequencies. Due to the small spectral width of the trityl (30 MHz) at Q-band frequencies, single frequency PDS techniques, like double-quantum coherence (DQC) and single frequency technique for refocusing dipolar couplings (SIFTER), work very efficiently. Hence, Q-band DQC and SIFTER experiments were performed and the results were compared; yielding a signal to noise ratio for SIFTER four times higher than that for DQC. At G-band frequencies the resolved axially symmetric g-tensor anisotropy of the trityl exhibited a spectral width of 130 MHz. Thus, pulsed electron electron double resonance (PELDOR/DEER) obtained at different pump-probe positions across the spectrum was used to reveal distances. Such a multi-frequency approach should also be applicable to determine structural information on biological macromolecules tagged with trityl spin labels.
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Affiliation(s)
- D Akhmetzyanov
- Goethe-University Frankfurt am Main, Institute of Physical and Theoretical Chemistry and Center for Biomolecular Magnetic Resonance, Max von Laue Str. 7, 60438 Frankfurt am Main, Germany.
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Abstract
Pulsed electron paramagnetic resonance (EPR) spectroscopy has become an important tool for structural characterization of biomolecules allowing measurement of the distances between two paramagnetic spin labels attached to a biomolecule in the 2-8 nm range. In this chapter, we will focus on applications of this approach to investigate tertiary structure elements as well as conformational dynamics of nucleic acid molecules. Both aspects take advantage of using specific spin labels that are rigidly attached to the nucleobases, as they allow obtaining not only the distance but also the relative orientation between both nitroxide moieties with high accuracy. Thus, not only the distance but additionally the three Euler angles between both the nitroxide axis systems and the two polar angles of the interconnecting vector with respect to the nitroxide axis systems can be extracted from a single pair of spin labels. To extract all these parameters independently and unambiguously, a set of multifrequency/multifield pulsed EPR experiments have to be performed. We will describe the experimental procedure as well as newly developed spin labels, which are helpful to disentangle all these parameters, and tools which we have developed to analyze such data sets. The procedures and analyses will be illustrated by examples from our laboratory.
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Affiliation(s)
- B Endeward
- Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University Frankfurt am Main, Frankfurt am Main, Germany
| | - A Marko
- Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University Frankfurt am Main, Frankfurt am Main, Germany
| | - V P Denysenkov
- Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University Frankfurt am Main, Frankfurt am Main, Germany
| | - S Th Sigurdsson
- Department of Chemistry, Science Institute, University of Iceland, Reykjavık, Iceland
| | - T F Prisner
- Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University Frankfurt am Main, Frankfurt am Main, Germany.
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Prisner TF, Marko A, Sigurdsson ST. Conformational dynamics of nucleic acid molecules studied by PELDOR spectroscopy with rigid spin labels. J Magn Reson 2015; 252:187-98. [PMID: 25701439 DOI: 10.1016/j.jmr.2014.12.008] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 12/16/2014] [Accepted: 12/19/2014] [Indexed: 05/22/2023]
Abstract
Nucleic acid molecules can adopt a variety of structures and exhibit a large degree of conformational flexibility to fulfill their various functions in cells. Here we describe the use of Pulsed Electron-Electron Double Resonance (PELDOR or DEER) to investigate nucleic acid molecules where two cytosine analogs have been incorporated as spin probes. Because these new types of spin labels are rigid and incorporated into double stranded DNA and RNA molecules, there is no additional flexibility of the spin label itself present. Therefore the magnetic dipole-dipole interaction between both spin labels encodes for the distance as well as for the mutual orientation between the spin labels. All of this information can be extracted by multi-frequency/multi-field PELDOR experiments, which gives very precise and valuable information about the structure and conformational flexibility of the nucleic acid molecules. We describe in detail our procedure to obtain the conformational ensembles and show the accuracy and limitations with test examples and application to double-stranded DNA.
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Affiliation(s)
- T F Prisner
- Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University Frankfurt, Germany.
| | - A Marko
- Institute of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic Resonance, Goethe University Frankfurt, Germany
| | - S Th Sigurdsson
- Science Institute, University of Iceland, Reykjavik, Iceland
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Chovanova L, Mravcova M, Imrich R, Rovensky J, Paulikova L, Rakicka M, Marko A, Penesova A, Radner H, Steiner G, Smolen J, Vlcek M. THU0479 Dheas-Associated Genotypes Contribute to Adrenal Androgen Hypofunction in RA. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.5779] [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: 11/04/2022]
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Gupta A, Wang S, Marko A, Joshi P, Ethirajan M, Chen Y, Yao R, Sajjad M, Kopelman R, Pandey RK. Polyacrylamide-based biocompatible Nanoplatform enhances the tumor uptake, PET/fluorescence imaging and anticancer activity of a chlorophyll analog. Theranostics 2014; 4:614-28. [PMID: 24723983 PMCID: PMC3982132 DOI: 10.7150/thno.8478] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [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: 01/02/2014] [Accepted: 02/13/2014] [Indexed: 12/30/2022] Open
Abstract
In this report we demonstrate the outstanding advantages of multifunctional nanoplatforms for cancer-imaging and therapy. The non-toxic polyacrylamide (PAA) nanoparticles (size:18-25 nm) formulation drastically changed the pharmacokinetic profile of the ¹²⁴I- labeled chlorophyll-a derivative (formulated in 10% ethanol in PBS) with a remarkable enhancement in tumor uptake, and significantly reduced uptake in spleen and liver. Among the various nanoformulations investigated, the ¹²⁴I- labeled photosensitizer (dose: 0.6142 MBq), and the cyanine dye-nanoparticles (CD-NP) conjugate (dose 0.3 μmol/kg) in combination showed great potential for tumor imaging (PET/NIR fluorescence) in BALB/c mice bearing Colon26 tumors. Compared to free non-labeled photosensitizer, the corresponding PAA nanoformulation under similar treatment parameters showed a remarkable enhancement in long-term tumor cure by PDT (photodynamic therapy) and provides an opportunity to develop a single nanoplatform for tumor-imaging (PET/fluorescence) and phototherapy, a practical "See and Treat" approach.
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Affiliation(s)
- Anurag Gupta
- 1. PDT Center, Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Shouyan Wang
- 2. Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Aimee Marko
- 1. PDT Center, Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Penny Joshi
- 1. PDT Center, Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Manivannan Ethirajan
- 1. PDT Center, Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Yihui Chen
- 1. PDT Center, Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Rutao Yao
- 3. Department of Nuclear Medicine, State University of New York, Buffalo, NY 14032, USA
| | - Munawwar Sajjad
- 3. Department of Nuclear Medicine, State University of New York, Buffalo, NY 14032, USA
| | - Raoul Kopelman
- 2. Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Ravindra K. Pandey
- 1. PDT Center, Cell Stress Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
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Margraf D, Bode BE, Marko A, Schiemann O, Prisner TF. Conformational flexibility of nitroxide biradicals determined by X-band PELDOR experiments. Mol Phys 2010. [DOI: 10.1080/00268970701724982] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Marko A, Margraf D, Yu H, Mu Y, Stock G, Prisner T. Molecular orientation studies by pulsed electron-electron double resonance experiments. J Chem Phys 2009; 130:064102. [DOI: 10.1063/1.3073040] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Bleiss W, Oberlander U, Hartmann S, Adam R, Marko A, Schonemeyer A, Lucius R. Protective Immunity Induced by Irradiated Third-Stage Larvae of the Filaria Acanthocheilonema viteae is Directed against Challenge Third-Stage Larvae before Molting. J Parasitol 2002. [DOI: 10.2307/3285572] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Bleiss W, Oberländer U, Hartmann S, Adam R, Marko A, Schönemeyer A, Lucius R. Protective immunity induced by irradiated third-stage larvae of the filaria Acanthocheilonema viteae is directed against challenge third-stage larvae before molting. J Parasitol 2002; 88:264-70. [PMID: 12053996 DOI: 10.1645/0022-3395(2002)088[0264:piibit]2.0.co;2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Jirds (Meriones unguiculatus) were vaccinated with irradiated L3 third-stage larvae (L3) of Acanthocheilonema viteae, and the time required for killing of the challenge L3 was determined. The number of parasites recovered from vaccinated jirds was reduced to about 10% of the control values on the second day after challenge infection and later on. Histological studies revealed an eosinophil-rich infiltrate containing macrophages, neutrophils, and mast cells in the vicinity of the L3 on day 2 after challenge and destruction of the worms by day 4 after challenge. Ultrastructural studies confirmed these data and showed that eosinophils, macrophages, and mast cells were close to the L3 on day 2 after challenge. Flattening of the eosinophils onto the surface of the worms, degranulation of electron-dense material, and rupture of the L3 surface was observed on day 4 after challenge, followed by invasion of the inner of the worms by phagocytic cells. These data show that immune attack against the challenge L3 in vaccinated jirds is initiated between the first and the second day after challenge and that killing occurs around the fourth day after challenge, before the worms undergo their first molt.
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Affiliation(s)
- W Bleiss
- Department of Molecular Parasitology, Institute of Biology, Humboldt-University Berlin, Germany
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Kaufman WC, Ratino DA, Marko A. Telemetry system for physiological evaluation of space suits. Aerosp Med 1969; 40:48-50. [PMID: 5782657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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