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Seifer P, Hay E, Fleischhauer L, Heilig J, Bloch W, Sonntag S, Shmerling D, Clausen-Schaumann H, Aszodi A, Niehoff A, Cohen-Solal M, Paulsson M, Wagener R, Zaucke F. The Matrilin-3 T298M mutation predisposes for post-traumatic osteoarthritis in a knock-in mouse model. Osteoarthritis Cartilage 2021; 29:78-88. [PMID: 33227438 DOI: 10.1016/j.joca.2020.09.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 09/04/2020] [Accepted: 09/29/2020] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The human matrilin-3 T303M (in mouse T298M) mutation has been proposed to predispose for osteoarthritis, but due to the lack of an appropriate animal model this hypothesis could not be tested. This study was carried out to identify pathogenic mechanisms in a transgenic mouse line by which the mutation might contribute to disease development. METHODS A mouse line carrying the T298M point mutation in the Matn3 locus was generated and features of skeletal development in ageing animals were characterized by immunohistology, micro computed tomography, transmission electron microscopy and atomic force microscopy. The effect of transgenic matrilin-3 was also studied after surgically induced osteoarthritis. RESULTS The matrilin-3 T298M mutation influences endochondral ossification and leads to larger cartilage collagen fibril diameters. This in turn leads to an increased compressive stiffness of the articular cartilage, which, upon challenge, aggravates osteoarthritis development. CONCLUSIONS The mouse matrilin-3 T298M mutation causes a predisposition for post-traumatic osteoarthritis and the corresponding knock-in mouse line therefore represents a valid model for investigating the pathogenic mechanisms involved in osteoarthritis development.
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Affiliation(s)
- P Seifer
- Center for Biochemistry, Medical Faculty, University of Cologne, Cologne, Germany
| | - E Hay
- Inserm UMR1132 and Paris Diderot University, Paris, France
| | - L Fleischhauer
- Center for Applied Tissue Engineering and Regenerative Medicine, Munich University of Applied Sciences, Munich, Germany; Experimental Surgery and Regenerative Medicine (ExperiMed), Department of General, Trauma and Reconstructive Surgery, Munich University Hospital, Ludwig-Maximilians-University, Munich, Germany
| | - J Heilig
- Center for Biochemistry, Medical Faculty, University of Cologne, Cologne, Germany; Cologne Center for Musculoskeletal Biomechanics (CCMB), Medical Faculty, University of Cologne, Cologne, Germany
| | - W Bloch
- Department of Molecular and Cellular Sports Medicine, Institute of Cardiology and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - S Sonntag
- ETH Phenomics Center (EPIC), Zurich, Switzerland
| | | | - H Clausen-Schaumann
- Center for Applied Tissue Engineering and Regenerative Medicine, Munich University of Applied Sciences, Munich, Germany
| | - A Aszodi
- Center for Applied Tissue Engineering and Regenerative Medicine, Munich University of Applied Sciences, Munich, Germany; Experimental Surgery and Regenerative Medicine (ExperiMed), Department of General, Trauma and Reconstructive Surgery, Munich University Hospital, Ludwig-Maximilians-University, Munich, Germany
| | - A Niehoff
- Cologne Center for Musculoskeletal Biomechanics (CCMB), Medical Faculty, University of Cologne, Cologne, Germany; Institute of Biomechanics and Orthopaedics, German Sport University Cologne, Cologne, Germany
| | - M Cohen-Solal
- Inserm UMR1132 and Paris Diderot University, Paris, France
| | - M Paulsson
- Center for Biochemistry, Medical Faculty, University of Cologne, Cologne, Germany
| | - R Wagener
- Center for Biochemistry, Medical Faculty, University of Cologne, Cologne, Germany
| | - F Zaucke
- Dr. Rolf M. Schwiete Research Unit for Osteoarthritis, Orthopedic University Hospital Friedrichsheim GGmbH, Frankfurt Am Main, Germany.
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Gronau T, Hansen U, Seidler DG, Iozzo RV, Aszódi A, Prein C, Clausen-Schaumann H, Krüger K, Mooren FC, Bertrand J, Pap T, Bruckner P, Dreier R. A4.10 Forced exercise-induced osteoarthritis is attenuated in mice lacking the small leucine-rich proteoglycan decorin. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-207259.92] [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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Affiliation(s)
- H Clausen-Schaumann
- Lehrstuhl für Angewandte Physik and Center for NanoScience, Ludwig-Maximilians-Universität, Amalienstrasse 54, 80799 München, Germany
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Docheva D, Padula D, Popov C, Weishaupt P, Prägert M, Miosge N, Hickel R, Böcker W, Clausen-Schaumann H, Schieker M. Establishment of immortalized periodontal ligament progenitor cell line and its behavioural analysis on smooth and rough titanium surface. Eur Cell Mater 2010; 19:228-41. [PMID: 20473831 DOI: 10.22203/ecm.v019a22] [Citation(s) in RCA: 37] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Periodontal ligament (PDL) can be obtained from patients undergoing orthodontic treatment. PDL contains progenitor cells that can be expanded and differentiated towards several mesenchymal lineages in vitro. Furthermore, PDL-derived cells have been shown to generate bone- and PDL-like structures in vivo. Thus, PDL cells, combined with suitable biomaterials, represent a promising tool for periodontitis-related research and PDL engineering. Here, a new PDL cell line using lentiviral gene transfer of human telomerase reverse transcriptase (hTERT) was created. HTERT-expressing PDL cells showed similar morphology and population doubling time but an extended lifespan compared to the primary cells. In addition, PDL-hTERT cells expressed several characteristic genes and upon osteogenic stimulation produced a calcified matrix in vitro. When cultivated on two topographically different titanium scaffolds (MA and SLA), PDL-hTERT cells exhibited augmented spreading, survival and differentiation on smooth (MA) compared to rough (SLA) surfaces. These findings differ from previously reported osteoblast behaviour, but they are in agreement with the behaviour of chondrocytes and gingival fibroblasts, suggesting a very cell type-specific response to different surface textures. In summary, we report the testing of titanium biomaterials using a new PDL-hTERT cell line and propose this cell line as a useful model system for periodontitis research and development of novel strategies for PDL engineering.
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Affiliation(s)
- D Docheva
- Laboratory for Experimental Surgery and Regenerative Medicine, Department of Surgery, LMU, Nussbaumstr. 20, D-80336 Munich, Germany.
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Blank K, Mai T, Gilbert I, Schiffmann S, Rankl J, Zivin R, Tackney C, Nicolaus T, Spinnler K, Oesterhelt F, Benoit M, Clausen-Schaumann H, Gaub HE. A force-based protein biochip. Proc Natl Acad Sci U S A 2003; 100:11356-60. [PMID: 12975526 PMCID: PMC208761 DOI: 10.1073/pnas.1934928100] [Citation(s) in RCA: 54] [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: 11/18/2022] Open
Abstract
A parallel assay for the quantification of single-molecule binding forces was developed based on differential unbinding force measurements where ligand-receptor interactions are compared with the unzipping forces of DNA hybrids. Using the DNA zippers as molecular force sensors, the efficient discrimination between specific and nonspecific interactions was demonstrated for small molecules binding to specific receptors, as well as for protein-protein interactions on protein arrays. Finally, an antibody sandwich assay with different capture antibodies on one chip surface and with the detection antibodies linked to a congruent surface via the DNA zippers was used to capture and quantify a recombinant hepatitis C antigen from solution. In this case, the DNA zippers enable not only discrimination between specific and nonspecific binding, but also allow for the local application of detection antibodies, thereby eliminating false-positive results caused by cross-reactive antibodies and nonspecific binding.
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Affiliation(s)
- K Blank
- nanotype, Lochhamer Schlag 12, 82166 Gräfelfing, Germany
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Abstract
For many biological molecules, force is an important functional and structural parameter. With the rapidly growing knowledge about the relation between structure, function, and force, single-molecule force spectroscopy has become a versatile analytical tool for the structural and functional investigation of single bio-molecules in their native environments. Within the past year, detailed insights into binding potentials of receptor ligand pairs, protein folding pathways, molecular motors, DNA mechanics and the functioning of DNA-binding agents (such as proteins and drugs), as well as the function of molecular motors, have been obtained.
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Affiliation(s)
- H Clausen-Schaumann
- Lehrstuhl für Angewandte Physik and Center for NanoScience, Ludwig-Maximilians-Universität, Amalienstrasse 54, D-80799 München, Germany
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Abstract
Using a modified atomic force microscope (AFM), individual double-stranded (ds) DNA molecules attached to an AFM tip and a gold surface were overstretched, and the mechanical stability of the DNA double helix was investigated. In lambda-phage DNA the previously reported B-S transition at 65 piconewtons (pN) is followed by a second conformational transition, during which the DNA double helix melts into two single strands. Unlike the B-S transition, the melting transition exhibits a pronounced force-loading-rate dependence and a marked hysteresis, characteristic of a nonequilibrium conformational transition. The kinetics of force-induced melting of the double helix, its reannealing kinetics, as well as the influence of ionic strength, temperature, and DNA sequence on the mechanical stability of the double helix were investigated. As expected, the DNA double helix is considerably destabilized under low salt buffer conditions (</=10 mM NaCl), while high ionic strength buffers (1 M NaCl) stabilize the double-helical conformation. The mechanical energy that can be deposited in the DNA double helix before force induced melting occurs was found to decrease with increasing temperature. This energy correlates with the base-pairing free enthalpy DeltaG(bp)(T) of DNA. Experiments with pure poly(dG-dC) and poly(dA-dT) DNA sequences again revealed a close correlation between the mechanical energies at which these sequences melt with base pairing free enthalpies DeltaG(bp)(sequence): while the melting transition occurs between 65 and 200 pN in lambda-phage DNA, depending on the loading rate, the melting transition is shifted to approximately 300 pN for poly(dG-dC) DNA, whereas poly(dA-dT) DNA melts at a force of 35 pN.
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Affiliation(s)
- H Clausen-Schaumann
- LMV-München, Lehrstuhl für Angewandte Physik and Center for Nanoscience, 80799 Munich, Germany
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Abstract
Atomic force microscope-based single-molecule force spectroscopy was employed to measure sequence-dependent mechanical properties of DNA by stretching individual DNA double strands attached between a gold surface and an AFM tip. We discovered that in lambda-phage DNA the previously reported B-S transition, where 'S' represents an overstretched conformation, at 65 pN is followed by a nonequilibrium melting transition at 150 pN. During this transition the DNA is split into single strands that fully recombine upon relaxation. The sequence dependence was investigated in comparative studies with poly(dG-dC) and poly(dA-dT) DNA. Both the B-S and the melting transition occur at significantly lower forces in poly(dA-dT) compared to poly(dG-dC). We made use of the melting transition to prepare single poly(dG-dC) and poly(dA-dT) DNA strands that upon relaxation reannealed into hairpins as a result of their self-complementary sequence. The unzipping of these hairpins directly revealed the base pair-unbinding forces for G-C to be 20 +/- 3 pN and for A-T to be 9 +/- 3 pN.
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Affiliation(s)
- M Rief
- Lehrstuhl für Angewandte Physik, München, Germany
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Abstract
The rupture force of single covalent bonds under an external load was measured with an atomic force microscope (AFM). Single polysaccharide molecules were covalently anchored between a surface and an AFM tip and then stretched until they became detached. By using different surface chemistries for the attachment, it was found that the silicon-carbon bond ruptured at 2.0 +/- 0.3 nanonewtons, whereas the sulfur-gold anchor ruptured at 1.4 +/- 0.3 nanonewtons at force-loading rates of 10 nanonewtons per second. Bond rupture probability calculations that were based on density functional theory corroborate the measured values.
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Affiliation(s)
- M Grandbois
- Lehrstuhl fur Angewandte Physik, Ludwig-Maximilians-Universitat, Amalienstrasse 54, D-80799 Munchen, Germany. Institut fur Physikalische und Theoretische Chemie, Technische Universitat Munchen, Lichtenbergstrasse 4, 85748 Garching
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Abstract
We have investigated the time course of the degradation of a supported dipalmitoylphosphatidylcholine bilayer by phospholipase A2 in aqueous buffer with an atomic force microscope. Contact mode imaging allows visualization of enzyme activity on the substrate with a lateral resolution of less than 10 nm. Detailed analysis of the micrographs reveals a dependence of enzyme activity on the phospholipid organization and orientation in the bilayer. These experiments suggest that it is possible to observe single enzymes at work in small channels, which are created by the hydrolysis of membrane phospholipids. Indeed, the measured rate of hydrolysis of phospholipids corresponds very well with the enzyme activity found in kinetic studies. It was also possible to correlate the number of enzymes at the surface, as calculated from the binding constant to the number of starting points of the hydrolysis. In addition, the width of the channels was found to be comparable to the diameter of a single phospholipase A2 and thus further supports the single-enzyme hypothesis.
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Affiliation(s)
- M Grandbois
- Lehrstuhl für Angewandte Physik, Ludwig Maximilians Universität München, Munich, Germany
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Gliss C, Clausen-Schaumann H, Günther R, Odenbach S, Randl O, Bayerl TM. Direct detection of domains in phospholipid bilayers by grazing incidence diffraction of neutrons and atomic force microscopy. Biophys J 1998; 74:2443-50. [PMID: 9591670 PMCID: PMC1299586 DOI: 10.1016/s0006-3495(98)77952-4] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.4] [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: 02/07/2023] Open
Abstract
The geometry of domains in phospholipid bilayers of binary (1:1) mixtures of synthetic lecithins with a difference in chain length of four methylene groups has been studied by two independent, direct and complementary methods. Grazing incidence diffraction of neutrons provided gel domain sizes of less than 10 nm in both the gel and the coexistence phase of the mixture, while no domains were detected for the fluid phase. For the coexistence region, the neutron data suggest that domains grow in number rather than in size with decreasing temperature. Atomic force microscopy was used to study gel phase size and shape of the domains. The domains imaged by atomic force microscopy exhibit a rather irregular shape with an average size of 10 nm, thus confirming the neutron results for this phase. The good agreement between atomic force microscopy and neutron results, despite the completely different nature of their observables, has potential for the future development of refined models for the interpretation of neutron data from heterogeneous membranes in terms of regularly spaced and spatially extended scatterers.
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Affiliation(s)
- C Gliss
- Institut für Physik EP-5, Universität Würzburg, Germany
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