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Erdmann EA, Nitsche S, Gorbushina AA, Schumacher J. Genetic Engineering of the Rock Inhabitant Knufia petricola Provides Insight Into the Biology of Extremotolerant Black Fungi. Front Fungal Biol 2022; 3:862429. [PMID: 37746170 PMCID: PMC10512386 DOI: 10.3389/ffunb.2022.862429] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 03/02/2022] [Indexed: 09/26/2023]
Abstract
Black microcolonial fungi (Ascomycetes from Arthonio-, Dothideo-, and Eurotiomycetes) are stress-tolerant and persistent dwellers of natural and anthropogenic extreme habitats. They exhibit slow yeast-like or meristematic growth, do not form specialized reproduction structures and accumulate the black pigment 1,8-dihydroxynaphthalene (DHN) melanin in the multilayered cell walls. To understand how black fungi live, survive, colonize mineral substrates, and interact with phototrophs genetic methods are needed to test these functions and interactions. We chose the rock inhabitant Knufia petricola of the Chaetothyriales as a model for developing methods for genetic manipulation. Here, we report on the expansion of the genetic toolkit by more efficient multiplex CRISPR/Cas9 using a plasmid-based system for expression of Cas9 and multiple sgRNAs and the implementation of the three resistance selection markers genR (geneticin/nptII), baR (glufosinate/bar), and suR (chlorimuron ethyl/sur). The targeted integration of expression constructs by replacement of essential genes for pigment synthesis allows for an additional color screening of the transformants. The black-pink screening due to the elimination of pks1 (melanin) was applied for promoter studies using GFP fluorescence as reporter. The black-white screening due to the concurrent elimination of pks1 and phs1 (carotenoids) allows to identify transformants that contain the two expression constructs for co-localization or bimolecular fluorescence complementation (BiFC) studies. The co-localization and interaction of the two K. petricola White Collar orthologs were demonstrated. Two intergenic regions (igr1, igr2) were identified in which expression constructs can be inserted without causing obvious phenotypes. Plasmids of the pNXR-XXX series and new compatible entry plasmids were used for fast and easy generation of expression constructs and are suitable for a broad implementation in other fungi. This variety of genetic tools is opening a completely new perspective for mechanistic and very detailed study of expression, functioning and regulation of the genes/proteins encoded by the genomes of black fungi.
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Affiliation(s)
- Eileen A. Erdmann
- Department of Materials and the Environment, Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
- Department of Biology Chemistry Pharmacy, Freie Universität Berlin, Berlin, Germany
| | - Sarah Nitsche
- Department of Materials and the Environment, Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
- Department of Biology Chemistry Pharmacy, Freie Universität Berlin, Berlin, Germany
| | - Anna A. Gorbushina
- Department of Materials and the Environment, Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
- Department of Biology Chemistry Pharmacy, Freie Universität Berlin, Berlin, Germany
- Department of Earth Sciences, Freie Universität Berlin, Berlin, Germany
| | - Julia Schumacher
- Department of Materials and the Environment, Bundesanstalt für Materialforschung und -prüfung (BAM), Berlin, Germany
- Department of Biology Chemistry Pharmacy, Freie Universität Berlin, Berlin, Germany
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Spielmann J, Ahmadi H, Scheepers M, Weber M, Nitsche S, Carnol M, Bosman B, Kroymann J, Motte P, Clemens S, Hanikenne M. The two copies of the zinc and cadmium ZIP6 transporter of Arabidopsis halleri have distinct effects on cadmium tolerance. Plant Cell Environ 2020; 43:2143-2157. [PMID: 32445418 DOI: 10.1111/pce.13806] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [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: 03/12/2020] [Revised: 05/16/2020] [Accepted: 05/16/2020] [Indexed: 06/11/2023]
Abstract
Plants have the ability to colonize highly diverse environments. The zinc and cadmium hyperaccumulator Arabidopsis halleri has adapted to establish populations on soils covering an extreme range of metal availabilities. The A. halleri ZIP6 gene presents several hallmarks of hyperaccumulation candidate genes: it is constitutively highly expressed in roots and shoots and is associated with a zinc accumulation quantitative trait locus. Here, we show that AhZIP6 is duplicated in the A. halleri genome. The two copies are expressed mainly in the vasculature in both A. halleri and Arabidopsis thaliana, indicative of conserved cis regulation, and acquired partial organ specialization. Yeast complementation assays determined that AhZIP6 is a zinc and cadmium transporter. AhZIP6 silencing in A. halleri or expression in A. thaliana alters cadmium tolerance, but has no impact on zinc and cadmium accumulation. AhZIP6-silenced plants display reduced cadmium uptake upon short-term exposure, adding AhZIP6 to the limited number of Cd transporters supported by in planta evidence. Altogether, our data suggest that AhZIP6 is key to fine-tune metal homeostasis in specific cell types. This study additionally highlights the distinct fates of duplicated genes in A. halleri.
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Affiliation(s)
- Julien Spielmann
- InBioS-PhytoSystems, Functional Genomics and Plant Molecular Imaging, University of Liège, Liège, Belgium
| | - Hassan Ahmadi
- Department of Plant Physiology, University of Bayreuth, Bayreuth, Germany
| | - Maxime Scheepers
- InBioS-PhytoSystems, Functional Genomics and Plant Molecular Imaging, University of Liège, Liège, Belgium
| | - Michael Weber
- Department of Plant Physiology, University of Bayreuth, Bayreuth, Germany
| | - Sarah Nitsche
- Department of Plant Physiology, University of Bayreuth, Bayreuth, Germany
| | - Monique Carnol
- InBioS-PhytoSystems, Laboratory of Plant and Microbial Ecology, University of Liège, Liège, Belgium
| | - Bernard Bosman
- InBioS-PhytoSystems, Laboratory of Plant and Microbial Ecology, University of Liège, Liège, Belgium
| | - Juergen Kroymann
- CNRS, AgroParisTech, Ecologie Systématique et Evolution, Université Paris-Saclay, Orsay, France
| | - Patrick Motte
- InBioS-PhytoSystems, Functional Genomics and Plant Molecular Imaging, University of Liège, Liège, Belgium
| | - Stephan Clemens
- Department of Plant Physiology, University of Bayreuth, Bayreuth, Germany
| | - Marc Hanikenne
- InBioS-PhytoSystems, Functional Genomics and Plant Molecular Imaging, University of Liège, Liège, Belgium
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Monsalve K, Mazurenko I, Lalaoui N, Le Goff A, Holzinger M, Infossi P, Nitsche S, Lojou J, Giudici-Orticoni M, Cosnier S, Lojou E. A H 2 /O 2 enzymatic fuel cell as a sustainable power for a wireless device. Electrochem commun 2015. [DOI: 10.1016/j.elecom.2015.09.014] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Albertazzi B, Béard J, Ciardi A, Vinci T, Albrecht J, Billette J, Burris-Mog T, Chen SN, Da Silva D, Dittrich S, Herrmannsdörfer T, Hirardin B, Kroll F, Nakatsutsumi M, Nitsche S, Riconda C, Romagnagni L, Schlenvoigt HP, Simond S, Veuillot E, Cowan TE, Portugall O, Pépin H, Fuchs J. Production of large volume, strongly magnetized laser-produced plasmas by use of pulsed external magnetic fields. Rev Sci Instrum 2013; 84:043505. [PMID: 23635194 DOI: 10.1063/1.4795551] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The production of strongly magnetized laser plasmas, of interest for laboratory astrophysics and inertial confinement fusion studies, is presented. This is achieved by coupling a 16 kV pulse-power system. This is achieved by coupling a 16 kV pulse-power system, which generates a magnetic field by means of a split coil, with the ELFIE laser facility at Ecole Polytechnique. In order to influence the plasma dynamics in a significant manner, the system can generate, repetitively and without debris, high amplitude magnetic fields (40 T) in a manner compatible with a high-energy laser environment. A description of the system and preliminary results demonstrating the possibility to magnetically collimate plasma jets are given.
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Affiliation(s)
- B Albertazzi
- LULI, École Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau, France.
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Giorgio S, Sao Joao S, Nitsche S, Chaudanson D, Sitja G, Henry CR. Environmental electron microscopy (ETEM) for catalysts with a closed E-cell with carbon windows. Ultramicroscopy 2006; 106:503-7. [PMID: 16515837 DOI: 10.1016/j.ultramic.2006.01.006] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2006] [Revised: 01/19/2006] [Accepted: 01/19/2006] [Indexed: 10/25/2022]
Abstract
In a standard high-resolution electron microscope (Jeol 3010), an environmental sample holder designed by Jeol, has been used for in situ observations at the atomic scale of catalysts, during a chemical reaction. Experiments have been performed in H(2) and O(2) at a pressure up to 4 mbar at room temperature, and in the case of H(2), at various temperatures until 350 degrees C. For the first time, Au and Pd clusters supported on TiO(2) and amorphous carbon have been observed with a windows-cell environmental electron microscopy (ETEM) system, with the resolution of the (1 1 1) lattice fringes. Au clusters have been cleaned in H(2) and have got the equilibrium shape of the fcc crystals during annealing. The same Au particles can be observed during successive treatments under O(2) and H(2). For Pd clusters in situ exposed to O(2) , the adhesion has decreased.
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Affiliation(s)
- S Giorgio
- CRMCN1, CNRS, Campus de Luminy, Case 913, 13288 Marseille, Cedex 9, France.
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Nitsche S, Funke C, Krause H, Wagemann W, Gleißner M. Therapie eines angeborenen Chylothorax mit Somatostatin und Äthoxysklerol. Z Geburtshilfe Neonatol 2004. [DOI: 10.1055/s-2004-829229] [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: 10/20/2022]
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Hildebrandt L, Nitsche S, Gleißner M. Fulminante nekrotisierende Enterocolitis eines gesunden Frühgeborenen von 34 SSW durch ampicillinresistenten Enterococcus faecium am 5. Lebenstag. Z Geburtshilfe Neonatol 2004. [DOI: 10.1055/s-2003-818226] [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: 10/20/2022]
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Nitsche S, Hildebrandt L, Gleißner M. ACE-Hemmer als Ursache einer Minderdurchblutung der Beine nach Korrekturoperation eines unterbrochenen Aortenbogens. Z Geburtshilfe Neonatol 2004. [DOI: 10.1055/s-2003-818230] [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: 10/20/2022]
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Ferry D, Suzanne J, Nitsche S, Popovitcheva OB, Shonija NK. Water adsorption and dynamics on kerosene soot under atmospheric conditions. ACTA ACUST UNITED AC 2002. [DOI: 10.1029/2002jd002459] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- D. Ferry
- Centre de Recherche sur les Mécanismes de la Croissance Cristalline-Centre National de la Recherche Scientifique; Campus de Luminy, Marseille; France
| | - J. Suzanne
- Centre de Recherche sur les Mécanismes de la Croissance Cristalline-Centre National de la Recherche Scientifique; Campus de Luminy, Marseille; France
| | - S. Nitsche
- Centre de Recherche sur les Mécanismes de la Croissance Cristalline-Centre National de la Recherche Scientifique; Campus de Luminy, Marseille; France
| | - O. B. Popovitcheva
- Microelectronic Department, Institute of Nuclear Physics; Moscow State University; Moscow Russia
| | - N. K. Shonija
- Microelectronic Department, Institute of Nuclear Physics; Moscow State University; Moscow Russia
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Bally T, Nitsche S, Roth K, Haselbach E. The cyclohexadiene+.cntdot./hexatriene+.cntdot.case revisited: evidence for five out of six possible hexatriene+.cntdot.rotamers. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100258a021] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Glebe D, Berting A, Broehl S, Naumann H, Schuster R, Fiedler N, Tolle TK, Nitsche S, Seifer M, Gerlich WH, Schaefer S. Optimised conditions for the production of hepatitis B virus from cell culture. Intervirology 2002; 44:370-8. [PMID: 11805445 DOI: 10.1159/000050074] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [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: 11/19/2022] Open
Abstract
In chronically infected patients, hepatitis B virus (HBV) particles reach numbers as large as >10(9) genome equivalents (GE)/ml of serum. However, expression of infectious HBV particles in cell culture only yields 10(5)-10(6) GE/ml, which is insufficient for many studies. HBV transcription and possibly replication is dependent on hepatocyte-specific differentiation. Thus, we tested several cell culture parameters that have been reported to enhance the expression of hepatocyte-specific markers, such as growth on different extracellular matrices, different cell culture media, low concentrations of fetal calf serum (FCS) and the addition of dimethyl sulfoxide (DMSO) to the medium. Lower concentrations of FCS, growth on collagen and inclusion of DMSO in the medium only moderately enhanced HBV production in vitro when applied individually. However, combinations of these parameters optimised cell culture conditions and reproducibly increased the release of HBV particles about 100-fold to titres >10(8) GE/ml of culture medium.
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Affiliation(s)
- D Glebe
- Institut für Medizinische Virologie, Justus-Liebig-Universität, Giessen, Germany
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Nitsche S. [The soul also participates in the bath]. Krankenpfl Soins Infirm 1999; 92:15-8. [PMID: 11941835] [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: 02/24/2023]
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Cerini C, Geider S, Dussol B, Hennequin C, Daudon M, Veesler S, Nitsche S, Boistelle R, Berthézène P, Dupuy P, Vazi A, Berland Y, Dagorn JC, Verdier JM. Nucleation of calcium oxalate crystals by albumin: involvement in the prevention of stone formation. Kidney Int 1999; 55:1776-86. [PMID: 10231440 DOI: 10.1046/j.1523-1755.1999.00426.x] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.3] [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: 11/20/2022]
Abstract
BACKGROUND Urine is supersaturated in calcium oxalate, which means that it will contain calcium oxalate crystals that form spontaneously. Their size must be controlled to prevent retention in ducts and the eventual development of a lithiasis. This is achieved, in part, by specific inhibitors of crystal growth. We investigated whether promoters of crystal nucleation could also participate in that control, because for the same amount of salt that will precipitate from a supersaturated solution, increasing the number of crystals will decrease their average size and facilitate their elimination. METHODS Albumin was purified from commercial sources and from the urine of healthy subjects or idiopathic calcium stone formers. Its aggregation properties were characterized by biophysical and biochemical techniques. Albumin was then either attached to several supports or left free in solution and incubated in a metastable solution of calcium oxalate. Kinetics of calcium oxalate crystallization were determined by turbidimetry. The nature and efficiency of nucleation were measured by examining the type and number of neoformed crystals. RESULTS Albumin, one of the most abundant proteins in urine, was a powerful nucleator of calcium oxalate crystals in vitro, with the polymers being more active than monomers. In addition, nucleation by albumin apparently led exclusively to the formation of calcium oxalate dihydrate crystals, whereas calcium oxalate monohydrate crystals were formed in the absence of albumin. An analysis of calcium oxalate crystals in urine showed that the dihydrate form was present in healthy subjects and stone formers, whereas the monohydrate, which is thermodynamically more stable and constitutes the core of most calcium oxalate stones, was present in stone formers only. Finally, urinary albumin purified from healthy subjects contained significantly more polymers and was a stronger promoter of calcium oxalate nucleation than albumin from idiopathic calcium stone formers. CONCLUSIONS Promotion by albumin of calcium oxalate crystallization with specific formation of the dihydrate form might be protective, because with rapid nucleation of small crystals, the saturation levels fall; thus, larger crystal formation and aggregation with subsequent stone formation may be prevented. We believe that albumin may be an important factor of urine stability.
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Affiliation(s)
- C Cerini
- INSERM U315, Physiologie et Pathologie Digestives, Hôpital Sainte-Marguerite, Marseille, France
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Celar AG, Tamaki K, Nitsche S, Schneider B. Guided versus unguided mandibular movement for duplicating intraoral eccentric tooth contacts in the articulator. J Prosthet Dent 1999; 81:14-22. [PMID: 9878970 DOI: 10.1016/s0022-3913(99)70230-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [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: 11/20/2022]
Abstract
STATEMENT OF PROBLEM The extent to which intraoral excursive tooth contacts are duplicated correctly in the articulator is constantly being investigated. PURPOSE This study evaluated whether data from unguided or guided hinge axis movement are superior in duplicating excursive tooth contacts. MATERIAL AND METHODS Intraoral records of tooth contacts from intercuspal position to 4 mm protrusion and laterotrusion were obtained from 50 subjects by using occlusogram wax. These movements were simulated in a SAM2 "P" articulator using horizontal condylar inclination and Bennett angle from recorded guided and unguided mandibular movements. Occlusograms were compared with contacts generated by the articulator. RESULTS On average, the articulator duplicated approximately 73% of intraoral protrusive and 81% of intraoral laterotrusive contacts for up to 4 mm of movement, using either data from unguided or guided movements. Both movements yielded identical means and no significant difference of duplicated contacts. However, individual differences scattered within approximately +/-32%. CONCLUSION Exclusive recommendation of guided movement can be questioned for accurate imitation of dynamic tooth contacts. In addition to the type of movement, other factors must be detected to enhance articulator adjustment and workings.
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Affiliation(s)
- A G Celar
- Department of Fixed and Removable Prosthodontics, University of Vienna, Vienna, Austria
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Geider S, Baronnet A, Cerini C, Nitsche S, Astier JP, Michel R, Boistelle R, Berland Y, Dagorn JC, Verdier JM. Pancreatic lithostathine as a calcite habit modifier. J Biol Chem 1996; 271:26302-6. [PMID: 8824282 DOI: 10.1074/jbc.271.42.26302] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Most biological fluids are supersaturated with calcium salts. A mechanism controlling crystal growth is therefore necessary to prevent excessive precipitation and development of a lithiasis. In pancreatic juice, calcite precipitation is prevented by lithostathine, a glycoprotein that inhibits calcite crystal growth. We describe here the interaction of lithostathine with calcite crystals. Without lithostathine, calcite crystals grew as rhombohedra showing six (104) faces. At low concentration (1 microM), lithostathine already altered crystal growth by generating new (110) faces. At physiological concentrations (3-10 microM), adsorption resulted in a transition from rhombohedral to sub-cubic habits. Immunochemical localization demonstrated that, although all (104) faces are equivalent, lithostathine binding was restricted to the face edges distal to the c axis. Scanning electron microscopy showed that, at the site of lithostathine binding, spreading of new CaCO3 layers during crystal growth was arrested before reaching the crystal diad axis-bearing edges. The successive kinks generated during crystal growth formed the new, striated (110)faces. Similar modifications were observed with the N-terminal undecapeptide of lithostathine that bears the inhibitory activity. With 100 microM lithostathine, (110) faces could reach the c axis outcrop of the former rhombohedron, resulting in an olive-shaped crystal. Finally, the number of crystals increased and their average size decreased when lithostathine concentration increased from 0.1 to 100 microM. Decreased Ca2+ concentration during crystal growth was delayed in the presence of lithostathine. It was concluded that lithostathine controls lithogenesis 1) by triggering germination of numerous calcite crystals and 2) by inhibiting the rate of Ca2+ ion apposition on the nuclei and therefore interfering with the apposition of new layers on calcite. Formation of smaller crystals, whose elimination is easier, is thereby favored.
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Affiliation(s)
- S Geider
- Unité de Recherche de Physiologie et Pathologie Digestives, INSERM U315, 46 Boulevard de la Gaye, 13258 Marseille Cedex 09 France 13009
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Geider S, Dussol B, Nitsche S, Veesler S, Berthézène P, Dupuy P, Astier JP, Boistelle R, Berland Y, Dagorn JC, Verdier JM. Calcium carbonate crystals promote calcium oxalate crystallization by heterogeneous or epitaxial nucleation: possible involvement in the control of urinary lithogenesis. Calcif Tissue Int 1996; 59:33-7. [PMID: 8661982 DOI: 10.1007/s002239900082] [Citation(s) in RCA: 14] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A large proportion of urinary stones have calcium oxalate (CaOx) as the major mineral phase. In these stones, CaOx is generally associated with minor amounts of other calcium salts. Several reports showing the presence of calcium carbonate (CaCO3) and calcium phosphate in renal stones suggested that crystals of those salts might be present in the early steps of stone formation. Such crystals might therefore promote CaOx crystallization from supersaturated urine by providing an appropriate substrate for heterogeneous nucleation. That possibility was investigated by seeding a metastable solution of 45Ca oxalate with vaterite or calcite crystallites. Accretion of CaOx was monitored by 45Ca incorporation. We showed that (1) seeds of vaterite (the hexagonal polymorph of CaCO3) and calcite (the rhomboedric form) could initiate calcium oxalate crystal growth; (2) in the presence of lithostathine, an inhibitor of CaCO3 crystal growth, such accretion was not observed. In addition, scanning electron microscopy demonstrated that growth occurred by epitaxy onto calcite seeds whereas no special orientation was observed onto vaterite. It was concluded that calcium carbonate crystals promote crystallization of calcium oxalate and that inhibitors controlling calcium carbonate crystal formation in Henle's loop might play an important role in the prevention of calcium oxalate stone formation.
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Affiliation(s)
- S Geider
- Unité de Recherches de Physiologie et Pathologie Digestives, INSERM U315, 46, Boulevard de la Gaye 13009 Marseille, France
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Mariani A, Bernard JP, Provansal-Cheylan M, Nitsche S, Sarles H. Differences of pancreatic stone morphology and content in patients with pancreatic lithiasis. Dig Dis Sci 1991; 36:1509-16. [PMID: 19160597 DOI: 10.1007/bf01296390] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
Pancreatic stones from 25 patients were compared by morphological and/or radiological examination. Twenty patients, mostly alcoholics, had calcified stones. Five (four nonalcoholic women) had radiolucent stones. Aspect and consistency of calcified stones varied from compact and resistant to coralliform and brittle but were identical in the same patient. In the coralliform type, organic fibrils with a diameter up to 10 microm and a length up to a few centimeters were observed, strongly attached to mineral crystals. The lithostathine (formerly called pancreatic stone protein, PSP) content was estimated in each stone significantly lower in the populations with larger stone mass, compared to populations with small amounts of stones. Transparent stones were built up of an amorphous material solubilized at acidic pH and corresponding to degraded forms of lithostathine-S (S for secretory). In one patient, we followed over seven years the evolution of a radiolucent calculus. We observed that the radiolucent core occurred first, and was secondarily wrapped in a calcified shell. We conclude that morphological differences observed in this study among pancreatic stones suggest that different mechanisms have been involved in their formation. Among them, lithostathine transformation into insoluble polypeptides may provide different types of protein aggregates, some of them being able to promote CaCO(3) apposition and others having no affinity for calcium.
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Affiliation(s)
- A Mariani
- Unite de recherches de Physologie et Pathologie Digestives, U 315 INSERM, 46, Boulevard de la Gaye, 13258 Marseille Cédex, France
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Bally T, Nitsche S, Roth K. Site‐selective photochemistry and vibrational analysis of matrix‐isolated 1,3,5,7‐octatetraene radical cations in different conformations. J Chem Phys 1986. [DOI: 10.1063/1.450327] [Citation(s) in RCA: 9] [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] Open
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