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Lorenzo N, Sabina DM, Guido C, Ilaria Grazia Z, Samira S, Valeria A, Daniele C, Diletta O, Antonella G, Marco M, Daniela B, Valerio DP, Andrea O, Agostino Maria DR, Fabio M, Maria Consiglia B, Jessica F, Sara M, Gian Luca G, Pierluigi Benedetti P, Paquale Bartomeo B, Felice G, Vincenzo C, Pietro I, Giuseppina C, Eugenio G, Domenico A. DCLK1, a Putative Stem Cell Marker in Human Cholangiocarcinoma. Hepatology 2021; 73:144-159. [PMID: 32978808 PMCID: PMC8243252 DOI: 10.1002/hep.31571] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2020] [Revised: 08/20/2020] [Accepted: 09/02/2020] [Indexed: 02/05/2023]
Abstract
BACKGROUND AND AIMS Cholangiocarcinoma (CCA) is a very aggressive cancer showing the presence of high cancer stem cells (CSCs). Doublecortin-like kinase1 (DCLK1) has been demonstrated as a CSC marker in different gastroenterological solid tumors. Our aim was to evaluate in vitro the expression and the biological function of DCLK1 in intrahepatic CCA (iCCA) and perihilar CCA (pCCA). APPROACH AND RESULTS Specimens surgically resected of human CCA were enzymatically digested, submitted to immunosorting for specific CSC markers (LGR5 [leucine-rich repeat-containing G protein-coupled receptor], CD [clusters of differentiation] 90, EpCAM [epithelial cell adhesion molecule], CD133, and CD13), and primary cell cultures were prepared. DCLK1 expression was analyzed in CCA cell cultures by real-time quantitative PCR, western blot, and immunofluorescence. Functional studies have been performed by evaluating the effects of selective DCLK1 inhibitor (LRRK2-IN-1) on cell proliferation (MTS [3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium] assay, cell population doubling time), apoptosis, and colony formation capacity. DCLK1 was investigated in situ by immunohistochemistry and real-time quantitative PCR. DCLK1 serum concentration was analyzed by enzyme-linked immunosorbent assay. We describe DCLK1 in CCA with an increased gene and protein DCLK1 expression in pCCALGR5+ and in iCCACD133+ cells compared with unsorted cells. LRRK2-IN-1 showed an anti-proliferative effect in a dose-dependent manner. LRRK2-IN-1 markedly impaired cell proliferation, induced apoptosis, and decreased colony formation capacity and colony size in both iCCA and pCCA compared with the untreated cells. In situ analysis confirmed that DCLK1 is present only in tumors, and not in healthy tissue. Interestingly, DCLK1 was detected in the human serum samples of patients with iCCA (high), pCCA (high), HCC (low), and cirrhosis (low), but it was almost undetectable in healthy controls. CONCLUSIONS DCLK1 characterizes a specific CSC subpopulation of iCCACD133+ and pCCALGR5+ , and its inhibition exerts anti-neoplastic effects in primary CCA cell cultures. Human DCLK1 serum might represent a serum biomarker for the early CCA diagnosis.
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Affiliation(s)
- Nevi Lorenzo
- Department of BiosciencesUniversity of MilanMilanItaly,Department of Translational and Precision MedicineSapienza University of RomeRomeItaly
| | - Di Matteo Sabina
- Department of Translational and Precision MedicineSapienza University of RomeRomeItaly,Department of ImmunologyBambino Gesù Children’s Hospital, IRCCSRomeItaly
| | - Carpino Guido
- Department of MovementHuman and Health SciencesUniversity of Rome “Foro Italico”RomeItaly
| | | | - Safarikia Samira
- Department of Translational and Precision MedicineSapienza University of RomeRomeItaly
| | - Ambrosino Valeria
- Department of Translational and Precision MedicineSapienza University of RomeRomeItaly
| | - Costantini Daniele
- Department of Translational and Precision MedicineSapienza University of RomeRomeItaly
| | - Overi Diletta
- Department of AnatomicalHistological, Forensic Medicine and Orthopedics SciencesSapienza University of RomeRomeItaly
| | - Giancotti Antonella
- Department of Maternal and Child Health and Urologic SciencesUmberto I HospitalSapienza University of RomeRomeItaly
| | - Monti Marco
- Department of Maternal and Child Health and Urologic SciencesUmberto I HospitalSapienza University of RomeRomeItaly
| | - Bosco Daniela
- Department of Pathological Anatomy and CytodiagnosticSapienza University of RomeRomeItaly
| | - De Peppo Valerio
- Hepatobiliary and Pancreatic Surgery IRCCSRegina Elena National Cancer InstituteRomeItaly
| | - Oddi Andrea
- Hepatobiliary and Pancreatic Surgery IRCCSRegina Elena National Cancer InstituteRomeItaly
| | - De Rose Agostino Maria
- Surgery, Hepatobiliary UnitCatholic University of the Sacred Heart School of Medicine and SurgeryRomeItaly
| | - Melandro Fabio
- Department of General Surgery and Organ TransplantationSapienza University of RomeRomeItaly
| | | | - Faccioli Jessica
- Department of Medico‐Surgical Sciences and BiotechnologiesSapienza University of RomeRomeItaly
| | - Massironi Sara
- Division of Gastroenterology and Center for Autoimmune Liver DiseasesDepartment of Medicine and SurgeryUniversity of Milan‐BicoccaMonzaItaly,European Reference Network on Hepatological Diseases (ERN RARE‐LIVER)San Gerardo HospitalMonzaItaly
| | - Grazi Gian Luca
- Hepatobiliary and Pancreatic Surgery IRCCSRegina Elena National Cancer InstituteRomeItaly
| | - Panici Pierluigi Benedetti
- Department of Maternal and Child Health and Urologic SciencesUmberto I HospitalSapienza University of RomeRomeItaly
| | | | - Giuliante Felice
- Surgery, Hepatobiliary UnitCatholic University of the Sacred Heart School of Medicine and SurgeryRomeItaly
| | - Cardinale Vincenzo
- Department of Medico‐Surgical Sciences and BiotechnologiesSapienza University of RomeRomeItaly
| | - Invernizzi Pietro
- Division of Gastroenterology and Center for Autoimmune Liver DiseasesDepartment of Medicine and SurgeryUniversity of Milan‐BicoccaMonzaItaly,European Reference Network on Hepatological Diseases (ERN RARE‐LIVER)San Gerardo HospitalMonzaItaly
| | | | - Gaudio Eugenio
- Department of AnatomicalHistological, Forensic Medicine and Orthopedics SciencesSapienza University of RomeRomeItaly
| | - Alvaro Domenico
- Department of Translational and Precision MedicineSapienza University of RomeRomeItaly
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Spanel P, Bahjri K, Sara M, Hanna B, Frei K. 25 Hydroxyvitamin D levels and gait, posture, and balance in Parkinson's Disease: A retrospective study. Parkinsonism Relat Disord 2020. [DOI: 10.1016/j.parkreldis.2020.06.328] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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José JFM, Jose M, Silverio R, Federico V, Isabel C, Martin OA, Inmaculada B, Cristina C, Julia HC, Dolores TM, Jose G, Paola P, Nieves DP, Vicent A, Sara B, Sara M, Julián L, Manuel S, Del Carmen MM, Ángel CM, Vicente G. Eastern Spanish experience with nivolumab in metastatic renal cell carcinoma. Clin Transl Oncol 2020; 22:1517-1523. [PMID: 32048159 DOI: 10.1007/s12094-020-02288-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 10/31/2019] [Accepted: 01/02/2020] [Indexed: 01/21/2023]
Abstract
BACKGROUND (OR PURPOSE) Nivolumab has been shown to be effective for the treatment of second-line mRCC. The present study has investigated the effectiveness and safety of nivolumab in real-world Eastern Spanish patients with advanced mRCC at TKI progression. PATIENTS AND METHODS A retrospective review of mRCC patients treated with nivolumab as a second-line treatment was performed. Analyzed variables included age, sex, ECOG (quality of life scale designed by the Eastern Cooperative Oncology Group), histology, nephrectomy, location of metastases, number of metastasis locations, previous treatments, analytical data from the standard blood count and biochemistry, and response to treatment. RESULTS 98 patients from 18 sites in Spain were retrospectively reviewed. The majority of patients were male (75%), had ECOG 0-1 (90.6%), had no brain metastasis (91.4%), had undergone one prior systemic regimen (94.3%), and were current/former smokers (97.1%). Fourteen patients (13.1%) had non-clear cell histology, seven (7.1%) had poor-IMDC prognostic group characteristics, 13 patients (13.1%) had liver metastasis and 35 (35.7%) had bone lesions. All patients received prior systemic therapy (63.3% sunitinib, 34.7% pazopanib). During the study, a median of eight doses of nivolumab was given (range 2-62) and 11 patients received more than 12 doses. Eleven patients (11.2%) received nivolumab as a third or fourth line of treatment. Median duration of therapy was 3.6 months (range 0.5-29.3). Confirmed response rate was 25%. Median progression free survival was 7.8 months (range 1.2-12.1). Median overall survival was 16.3 months (range 1.7-29.3). After discontinuation of treatment, 27.58% of the patients received subsequent systemic cancer therapy. Side effects were mostly grade 1-2 (7.2% had hypothyroidism and 6.2% liver toxicity, 4% had nephritis and 2% hypophysitis). Two cases of grade 3-4 adverse events (2%) were reported. CONCLUSION Benefit/risk profile of nivolumab in Eastern-Spanish real-world population with mRCC after tyrosine-kinase inhibitors was consistent with prior real-life studies reported as well as pivotal study.
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Affiliation(s)
- J-F M José
- Division Genitourinary Oncology, Fundación Instituto Valenciano de Oncología, Valencia, Spain.
| | - M Jose
- Hospital Universitario La Fe de Valencia, Valencia, Spain
| | - R Silverio
- Hospital Universitario Virgen de La Arrixaca, Murcia, Spain
| | - V Federico
- Hospital General Universitario de Elche, Alicante, Spain
| | - C Isabel
- Hospital Universitario Clínico de Valencia, Valencia, Spain
| | - O-A Martin
- Consorcio Hospitalario Provincial de Castellón, Castellón, Spain
| | - B Inmaculada
- Hospital General Universitario Morales Meseguer, Murcia, Spain
| | - C Cristina
- Hospital General Universitario de Valencia, Valencia, Spain
| | - H-C Julia
- Hospital Lluís Alcanyís, Xativa, Spain
| | - T M Dolores
- Hospital Universitario Doctor Peset, Valencia, Spain
| | - G Jose
- Hospital Universitario Arnau de Vilanova de Valencia, Valencia, Spain
| | - P Paola
- Hospital General Universitario Santa Lucía, Cartagena, Spain
| | - Del P Nieves
- Hospital Universitario del Vinalopó, Alicante, Spain
| | - A Vicent
- Hospital Universitario Francesc de Borja de Gandía, Valencia, Spain
| | - B Sara
- Hospital de Sagunto, Valencia, Spain
| | - M Sara
- Hospital de Manises, Valencia, Spain
| | - L Julián
- Hospital Universitario de Alzira, Valencia, Spain
| | - S Manuel
- Hospital QuironSalud Torrevieja (España), Alicante, Spain
| | - M M Del Carmen
- Division Genitourinary Oncology, Fundación Instituto Valenciano de Oncología, Valencia, Spain
| | - C M Ángel
- Division Genitourinary Oncology, Fundación Instituto Valenciano de Oncología, Valencia, Spain
| | - G Vicente
- Division Genitourinary Oncology, Fundación Instituto Valenciano de Oncología, Valencia, Spain
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Pitout M, Weber S, Sara M. Improving patient outcomes in the intensive care unit: The impact of infection control measures. Int J Infect Dis 2014. [DOI: 10.1016/j.ijid.2014.03.1286] [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: 11/26/2022] Open
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Charkravarti A, Wang M, Robins I, Guha A, Curren W, Brachman D, Schultz C, Choucair A, Dolled-Filhart M, Christiansen J, Gustavson M, Molinaro A, Mischel P, Lautenschlaeger T, Dicker A, Mehta M, Phillips CA, Dhulibala S, Hallahan D, Jaboin J, Cardinale FS, Dickey P, Goodrich I, Gorelick J, Sinha R, Dest VM, Chen C, Olsen C, Franklin W, Kleinschmidt-DeMasters B, Kavanagh BD, Lillehei K, Waziri A, Damek D, Gaspar LE, Stauder MC, Laack NN, Link MJ, Pollock BE, Schomberg PJ, Fraser JF, Pannullo SC, Moliterno J, Cobb W, Stieg PE, Vinchon-Petit S, Jarnet D, Michalak S, Lewis A, Benoit JP, Menei P, Desmarais G, Paquette B, Bujold R, Mathieu D, Fortin D, Cuneo KC, Vredenburgh JJ, Sampson JH, Reardon DA, Desjardins A, Peters KL, Kirkpatrick JP, Patel PN, Vyas R, Suryanarayan U, Bhavsar D, Mehta M, Hayhurst C, Monsalves E, Van Prooijen M, Menard C, Zadeh G, Chung C, Burrell K, Lindsey P, Menard C, Zadeh G, Burri SH, Asher AL, Kelly RB, Boltes P, Fraser RW, Dilmanian FA, Rusek A, Desnoyers NR, Park JY, Dane B, Dioszegi I, Hurley SD, O'Banion MK, Tomasi D, Wang R, Meek AG, Sleire L, Wang J, Heggdal J, Pedersen PH, Enger PO, Clump DA, Srinivas R, Wegner RE, Heron DE, Burton SA, Mintz AH, Howard SP, Robins HI, Tome WA, Paravati AJ, Heron DE, Gardner PA, Snyderman C, Ozhasoglu C, Quinn A, Burton SA, Seelman K, Seelman K, Mintz AH, Chang JH, Park YG, Mehta MJ, Patel PN, Vyas RK, Bhavsar DC, Guarnaschelli JN, Imwalle L, Ying J, McPherson C, Warnick R, Breneman J, Khwaja SS, Laack NN, Wetjen NM, Brown PD, Siedow M, Nestler U, Perry J, Huebner A, Chakravarti A, Lautenschlaeger T, Glass J, Andrews D, Werner-Wasik M, Evans J, Lawrence R, Martinez N, Anuradha G, David M, Sara M, Mark L, Ricardo B, Jeff J, Juan H, Kozono D, Zinn P, Ng K, Chen C, Melian E, Prabhu V, Sethi A, Barton K, Anderson D, Rockne RC, Mrugala M, Rockhill J, Swanson KR. Radiation Therapy. Neuro Oncol 2010. [DOI: 10.1093/neuonc/noq116.s15] [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: 11/13/2022] Open
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Pistoia F, Cipollone F, Ferri C, Sara M, Sudano I, Desideri G. Cyclooxygenase and Atherosclerosis: A Smoking Area. Curr Pharm Des 2010; 16:2567-71. [DOI: 10.2174/138161210792062902] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Accepted: 06/02/2010] [Indexed: 11/22/2022]
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Pavkov T, Egelseer EM, Sara M, Keller W. First atomic structure of bacterial S-layer protein reveals a novel protein architecture. Acta Crystallogr A 2007. [DOI: 10.1107/s0108767307095451] [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: 11/11/2022] Open
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Abstract
Two-dimensional bacterial surface layer protein crystals (S-layers) are the most commonly observed cell surface structures in prokaryotic organisms (bacteria and archaea). Isolated S-layer proteins have the intrinsic tendency to self-assemble into two-dimensional arrays in suspension and at various interfaces. Basic research on the structure, genetics, chemistry, morphogenesis and function of S-layers has led to a broad spectrum of applications in molecular nanotechnology and biomimetics. The possibility to change the natural properties of S-layer proteins by genetic manipulation opens new ways for the tuning of their structural and functional features. Functionalised S-layer proteins that maintain their propensity for self-assembly have led to new affinity matrices, diagnostic tools, vaccines or biocompatible surfaces, as well as to biological templating or specific biomineralisation strategies at surfaces.
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Affiliation(s)
- D Pum
- Center for Nanotechnology, University of Natural Resources and Applied Life Sciences--BOKU, Vienna, Austria
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Tanaka K, Sara M, Hirata Y, Nagai R. W09-P-024 Circulating progenitors contribute to neointimal formation in non-irradiated bone marrow chimeric mice. ATHEROSCLEROSIS SUPP 2005. [DOI: 10.1016/s1567-5688(05)80179-5] [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]
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Vogel P, Maddalena T, Sara M. Crocidura cossyrensis Contoli, 1989 (Mammalia, Soricidae): karyotype, biochemical genetics and hybridization experiments. REV SUISSE ZOOL 2004. [DOI: 10.5962/bhl.part.80277] [Citation(s) in RCA: 4] [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: 11/15/2022]
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Sara M, Faubert J. Aging, perception, and visual short-term memory for luminance-defined form. Ophthalmic Physiol Opt 2000; 20:314-22. [PMID: 10962697] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
The sensory, perceptual, and visual short-term memory (VSTM) capacity of young and older observers for processing luminance-defined shape information was assessed in a series of experiments. The following were assessed: each individual's threshold necessary to detect a square from its background as measured by luminance thresholds; the capacity for making simultaneous size discriminations when compensating for individual differences in sensory input; the capacity for making sequential size discriminations; and the capacity for remembering size differences over time. The results show a selective deficit for simultaneous perceptual processing for older subjects, which cannot be attributed to differences in sensory input, task difficulty, interhemispheric transfer, or VSTM.
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Affiliation(s)
- M Sara
- Ecole d'optométrie, Université de Montréal, Canada
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Cerrano C, Arillo A, Bavestrello G, Benatti U, Calcinai B, Cattaneo-Vietti R, Cortesogno L, Gaggero L, Giovine M, Puce S, Sara M. Organism-quartz interactions in structuring benthic communities: towards a marine bio-mineralogy? Ecol Lett 1999. [DOI: 10.1046/j.1461-0248.1999.00041.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Bavestrello G, Benatti U, Calcinai B, Cattaneo-Vietti R, Cerrano C, Favre A, Giovine M, Lanza S, Pronzato R, Sara M. Body Polarity and Mineral Selectivity in the Demosponge Chondrosia reniformis. Biol Bull 1998; 195:120-125. [PMID: 28570172 DOI: 10.2307/1542819] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The skeleton of the common Mediterranean demosponge Chondrosia reniformis lacks endogenous spicules; but exogenous siliceous material is selectively incorporated into its collagenous ectosome, strengthening this layer. Nevertheless, the settling of sponge buds during asexual reproduction necessitates an active incorporation of the calcareous substratum through the sponge lower ectosome. This fact suggests the presence of a polarity in the sponge, with the lower surface selecting primarily carbonates, and the upper surface selecting exclusively silicates and quartz. Our observations under experimental conditions showed that the strong selectivity of the upper ectosome is realized only when the sponge is fixed to the substratum; if detached, the sponge incorporates both quartz and carbonates. In laboratory experiments, the incapacity of both kinds of ectosome to regenerate into a new complete sponge suggests that this polarity arises early in ontogeny.
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Grabherr R, Ernst W, Doblhoff-Dier O, Sara M, Katinger H. Expression of foreign proteins on the surface of Autographa californica nuclear polyhedrosis virus. Biotechniques 1997; 22:730-5. [PMID: 9105625 DOI: 10.2144/97224rr02] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.6] [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: 02/04/2023] Open
Abstract
Based on the method of direct cloning into the baculovirus genome by linearizing and re-ligation in presence of the target insert, we designed viral constructs that express foreign genes on the surface of baculovirus particles. We chose the glycosylated envelope protein gp41 of human immunodeficiency virus type 1 (HIV-1) as a model for displaying recombinant proteins on budded virus. The ectodomain of the envelope protein gp41 of HIV-1 was being fused to the entire baculovirus major coat protein gp64 (Ac-cops41) and to the membrane anchor sequence of gp64 (Acmars41). Two different promoters, the "very late" polyhedrin promoter (Ac-mars41) and the "early and late" gp64 promoter (Ac-promars41) were compared. The expression of gp41 in infected cells and its presence on viral particles was confirmed by enzyme-linked immunosorbent assay (ELISA), Western blot and electron microscopy.
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Affiliation(s)
- R Grabherr
- University of Agriculture, Food Science and Forestry, Vienna, Austria
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Prassl R, Chapman JM, Nigon F, Sara M, Eschenburg S, Betzel C, Saxena A, Laggner P. Crystallization and preliminary X-ray analysis of a low density lipoprotein from human plasma. J Biol Chem 1996; 271:28731-3. [PMID: 8910510 DOI: 10.1074/jbc.271.46.28731] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [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: 02/03/2023] Open
Abstract
Single crystals of human plasma low density lipoprotein (LDL), the major transport vehicle for cholesterol in blood, have been produced with a view to analysis of the three-dimensional structure by x-ray crystallography. Crystals with dimensions of approximately 200 x 100 x 50 microm have been reproducibly obtained from highly homogeneous LDL particle subspecies, isolated in the density ranges d = 1.0271-1. 0297 g/ml and d = 1.0297-1.0327 g/ml. Electron microscopic imaging of ultrathin-sectioned preparations of the crystals confirmed the existence of a regular, quasihexagonal arrangement of spherical particles of approximately 18 nm in diameter, thereby resembling the dimensions characteristic of LDL after dehydration and fixation. X-ray diffraction with synchrotron radiation under cryogenic conditions revealed the presence of well resolved diffraction spots, to a resolution of about 29 A. The diffraction patterns are indexed in terms of a triclinic lattice with unit cell dimensions of a = 16. 1 nm, b = 39.0 nm, c = 43.9 nm; alpha = 96.2 degrees, beta = 92.1 degrees, gamma = 102 degrees, and with space group P1.
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Affiliation(s)
- R Prassl
- Institute of Biophysics and X-ray Structure Research, Austrian Academy of Sciences, A-8010 Graz, Austria.
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Koller G, Graumann K, Kramer W, Sara M, Jungbauer A. Laboratory-scale production and purification of recombinant HIV-1 reverse transcriptase. J Chromatogr B Biomed Appl 1995; 664:107-18. [PMID: 7538852 DOI: 10.1016/0378-4347(94)00468-k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
HIV-1 reverse transcriptase from the HIV-1 strain WMF 1.13 was expressed in Escherichia coli JM 105 using a pKK233-2 vector. The bacteria were cultivated in a 20-l fermentor with 14-l net volume using M9ZB medium containing bactotryptone and yeast extract. After induction of reverse transcriptase (RT) expression by addition of isopropyl-beta-D-thiogalactopyranoside the enzyme concentration was monitored. Both soluble and inclusion-body deposited RT were detected by Western blots. Inclusion-body formation was confirmed by transmission electron microscopy. Further purification of soluble and insoluble RT was investigated. After cell desintegration by enzymatic treatment combined with osmotic shock and centrifugation, the supernatant was desalted by size-exclusion chromatography and further purified by DEAE-Sepharose FF, AF-Heparin Toyopearl 650 M and Fractogel EMD TMAE 650 (S). The results of the purification steps were monitored by SDS-PAGE with silver staining, non-radioactive RT assay and protein determination with Coomassie Blue. The sediment was extracted with 6 M GuHCl and after clarification and conventional refolding, treated in the same manner as soluble RT. This method is well suited for studying fermentation conditions as well as purification conditions. The RT is expressed in approximately equal amounts as soluble and insoluble enzyme.
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Affiliation(s)
- G Koller
- Institute of Applied Microbiology, Universität für Bodenkultur, Vienna, Austria
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Ohnesorge F, Heckl WM, Häberle W, Pum D, Sara M, Schindler H, Schilcher K, Kiener A, Smith DP, Sleytr UB. Scanning force microscopy studies of the S-layers from Bacillus coagulans E38-66, Bacillus sphaericus CCM2177 and of an antibody binding process. Ultramicroscopy 1992; 42-44 ( Pt B):1236-42. [PMID: 1413261 DOI: 10.1016/0304-3991(92)90429-n] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [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: 12/26/2022]
Abstract
In many prokaryotic cells (eubacteria and archaebacteria) the outermost cell envelope component is composed of a regularly structured protein surface layer (S-layer). The two-dimensional S-layer from Bacillus coagulans E38-66 and Bacillus sphaericus CCM2177 has been investigated by SFM at molecular resolution under physiological conditions (i.e., in buffer solution). We find the E38-66 S-layer lattice to be oblique with lattice parameters of a = 9-10 nm, b = 7-8 nm and gamma = 80 degrees -90 degrees (E38-66). The CCM2177 lattice is square with a = 12-14 nm, in good agreement with TEM data. We have used the unique possibility of the SFM to study the kinematics of biological processes and have performed experiments on the adhesion of polyclonal antibodies to the recrystallized E38-66 protein layer on a time scale of about two to ten seconds per image frame. This represents a first step in directly visualizing molecular recognition reactions.
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Affiliation(s)
- F Ohnesorge
- Physics Group Munich, IBM Research Division, Germany
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