Krenn V.,Zentrum fur Histologie |
Kno P.,Zentrum fur Histologie |
Ruther W.,Klinik fur Orthopadie |
Jakobs M.,Zentrum fur Histologie |
And 5 more authors.
Orthopade | Year: 2010
Background: Meniscal degeneration (MD) is a structural change of fibrous cartilage that is common in orthopaedic diagnostics and relevant for health insurance matters. So far, there has been neither a standardised scoring system nor an immunohistochemical marker for MD. Material and method: In this retrospective trial, the meniscal tissue of 60 patients was assessed immunohistochemically for NITEGE (G1 fragment of the proteoglycan aggrecan) expression. NITEGE expression was correlated with defined grades of MD: little (grade 0/1), medium (grade 2), or severe (grade 3). Results: Detection of extracellular NITEGE deposits in grade 2 or 3 MD had a positive predictive value and specificity of 100%, whereas no deposits were found in grade 0/1 MD. Sensitivity in advanced MD was 55%. Detection of extracellular NITEGE correlated positively with the grade of degeneration, as did patient age and the grade of degeneration. The patient age of those with grade 0/1 MD was significantly lower than for grade 3 (p<0.0001). Conclusion: The thoroughly defined degeneration score (grade 1 - grade 3 MD) is suitable to assess the severity of degeneration. Extracellular NITEGE deposits can be regarded as an immunohistochemical marker for advanced (grades 2 and 3) MD. © 2010 Springer Medizin Verlag.
Lemke A.K.,University of Kiel |
Sandy J.D.,Rush University Medical Center |
Voigt H.,University of Kiel |
Dreier R.,University of Munster |
And 7 more authors.
Cell and Tissue Research | Year: 2010
Pro-inflammatory cytokines induce meniscal matrix degradation and inhibition of endogenous repair mechanisms, but the pathogenic mechanisms behind this are mostly unknown. Therefore, we investigated details of interleukin-1 (IL-1α)-induced aggrecan turnover in mature meniscal tissue explants. Fibro-cartilagenous disks (3 mm diameter×1 mm thickness) were isolated from the central, weight-bearing region of menisci from 2-year-old cattle. After 3 or 6 days of IL-1α-treatment, GAG loss (DMMB assay), biosynthetic activity ([35SO4]-sulfate and [3H]-proline incorporation), gene expression (quantitative RT-PCR) and the abundance (zymography, Western blot) of matrix-degrading enzymes and specific aggrecan products were determined. Meniscal fibrocartilage had a 4-fold lower GAG content (per wet weight) than adjacent articular cartilage, and expressed MMPs-1, -2, -3 and ADAMTS4 constitutively, whereas ADAMTS5 m-RNA was essentially undetectable. Significant IL-1 effects were a decrease in biosynthetic activity, an increase in GAG release and in the expression/abundance of MMP-2, MMP-3 and ADAMTS4. Fresh tissue contained aggrecan core protein products similar to those previously described for bovine articular cartilage of this age. IL-1 induced the release of aggrecanase-generated CS-substituted products including both high (>250 kDa) and low molecular weight (about 75 kDa) species. TIMP-3 (but not TIMP-1 and -2 or a broad spectrum MMP inhibitor) inhibited IL-1-dependent GAG loss. In addition, IL-1 induced the release of preformed pools of three known G1-bearing products. We conclude that aggrecanases are responsible for IL-1-stimulated GAG release from meniscal explants, and that IL-1 also stimulates release of G1-bearing products, by a process possibly involving hyaluronan fragmentation. © Springer-Verlag 2010.
Langer H.F.,University of Tübingen |
Von Der Ruhr J.W.,University of Tübingen |
Daub K.,University of Tübingen |
Schoenberger T.,University of Tübingen |
And 17 more authors.
Journal of Molecular Medicine | Year: 2010
Tissue injury is inevitably accompanied by disruption of the endothelium and exposure of the subendothelial matrix. To generate a guidance molecule directing progenitor cells to sites of vascular lesions, we designed a bifunctional protein. The protein consists of the soluble platelet collagen receptor glycoprotein VI and an antibody to CD133 (hereafter called GPVI-CD133). In vitro and in vivo, this construct substantially mediates endothelial progenitor cell (EPC) homing to vascular lesions. Exposure of EPCs to GPVI-CD133 did not impair their capability to differentiate toward mature endothelial cells as verified by the formation of colony-forming units, the upregulation of endothelial markers CD31 and CD146 analyzed by flow cytometry or von Willebrand factor and endoglin assessed by immunofluorescence microscopy, as well as the presence of Weibel-Palade bodies using transmission electron microscopy. In vivo, GPVI-CD133 augments reendothelialization of vascular lesions. Thus, this bifunctional protein could be a potential new therapeutic option for cardiovascular diseases. © 2010 Springer-Verlag.
Zhang J.,University of Bonn |
Dublin P.,University of Bonn |
Griemsmann S.,University of Bonn |
Klein A.,A-Life Medical |
And 5 more authors.
PLoS ONE | Year: 2013
Herein we demonstrate with PCR, immunodetection and reporter gene approaches that the widely used human Glial Fibrillary Acidic Protein (hGFAP)-Cre transgene exhibits spontaneous germ-line recombination activity in leading to deletion in brain, heart and tail tissue with high frequency. The ectopic activity of hGFAP-Cre requires a rigorous control. We likewise observed that a second widely used nestin-Cre transgene shows germ-line deletion. Here we describe procedures to identify mice with germ-line recombination mediated by the hGFAP-Cre and nestin-Cre transgenes. Such control is essential to avoid pleiotropic effects due to germ-line deletion of loxP-flanked target genes and to maintain the CNS-restricted deletion status in transgenic mouse colonies. Copyright: © 2013 Zhang et al.
PubMed | University of Bonn, A-Life Medical and Anatomisches Institute
Type: Journal Article | Journal: PloS one | Year: 2013
Herein we demonstrate with PCR, immunodetection and reporter gene approaches that the widely used human Glial Fibrillary Acidic Protein (hGFAP)-Cre transgene exhibits spontaneous germ-line recombination activity in leading to deletion in brain, heart and tail tissue with high frequency. The ectopic activity of hGFAP-Cre requires a rigorous control. We likewise observed that a second widely used nestin-Cre transgene shows germ-line deletion. Here we describe procedures to identify mice with germ-line recombination mediated by the hGFAP-Cre and nestin-Cre transgenes. Such control is essential to avoid pleiotropic effects due to germ-line deletion of loxP-flanked target genes and to maintain the CNS-restricted deletion status in transgenic mouse colonies.
Koch R.,Anatomisches Institute |
Hennig-Pauka I.,Klinik fur Kleine Klauentiere |
Gasse H.,Anatomisches Institute
Pneumologie | Year: 2010
The histological composition of the Lamina propria in pigs especially in the cranial fold of the glottis gives reason to expect other phoniatric properties than in man. Age-related changes must be considered. © 2010 Georg Thieme Verlag KG Stuttgart New York.
Madry H.,Saarland University |
van Dijk C.N.,University of Amsterdam |
Mueller-Gerbl M.,Anatomisches Institute
Knee Surgery, Sports Traumatology, Arthroscopy | Year: 2010
In the past decades, considerable efforts have been made to propose experimental and clinical treatments for articular cartilage defects. Yet, the problem of cartilage defects extending deep in the underlying subchondral bone has not received adequate attention. A profound understanding of the basic anatomic aspects of this particular site, together with the pathophysiology of diseases affecting the subchondral bone is the key to develop targeted and effective therapeutic strategies to treat osteochondral defects. The subchondral bone consists of the subchondral bone plate and the subarticular spongiosa. It is separated by the cement line from the calcified zone of the articular cartilage. A variable anatomy is characteristic for the subchondral region, reflected in differences in thickness, density, and composition of the subchondral bone plate, contour of the tidemark and cement line, and the number and types of channels penetrating into the calcified cartilage. This review aims at providing insights into the anatomy, morphology, and pathology of the subchondral bone. Individual diseases affecting the subchondral bone, such as traumatic osteochondral defects, osteochondritis dissecans, osteonecrosis, and osteoarthritis are also discussed. A better knowledge of the basic science of the subchondral region, together with additional investigations in animal models and patients may translate into improved therapies for articular cartilage defects that arise from or extend into the subchondral bone. © Springer-Verlag 2010.
Tscheschke B.,Leibniz University of Hanover |
Dreimann J.,Leibniz University of Hanover |
von der Ruhr J.W.,Anatomisches Institute |
Schmidt T.,Anatomisches Institute |
And 3 more authors.
Biotechnology and Bioengineering | Year: 2015
In this article we describe the development, the characterization and the evaluation of a novel bioreactor type for the cultivation of different pro- and eukaryotic cell-systems: the mist-chamber bioreactor. This innovative bioreactor meets the demand of cultivation systems for shear stress sensitive cells with high requirements for gas supply. Within the mist-chamber bioreactor the cells are cultivated inside an aerosol of vaporized medium generated by ultrasonic vaporization. In contrast to many established bioreactor systems the mist-chamber bioreactor offers an environment with an excellent gas supply without any impeller or gas bubble induced shear stress. A mist-chamber bioreactor prototype has been manufactured and characterized during this work. In the technical and chemical characterization we evaluated the vaporization process, resulting in a vaporization performance of 32mL/h at working conditions. On this basis we calculated a biomass of 1.4g (S. cerevisiae, qs=3.45×10-3mol/g/h) and 3.4g (Aspergillus niger, qs=1.33×10-3mol/g/h) where the growth rate becomes limited by transport processes. Additionally, we determined a homogenous cultivation area to a height of 3cm giving a total volume of 0.45L for the cultivation. Medium components were examined according to their stability during vaporization with the result that all components are stable for at least 5 days. After the technical characterization we demonstrated the feasibility to cultivate S. cerevisiae and F. velupites in the mist-chamber bioreactor. The results demonstrated that the mist-chamber bioreactor is able to transport a sufficient amount of nutrients consistently to the cell samples and offers an excellent oxygen supply without any shear stress inducing aeration. Furthermore we successfully cultivated F. velupites in a solid state cultivation in a long term experiment. The data indicate that the new bioreactor concept can contribute to improve various fermentations and cell culture processes depending on the cultured cell types. © 2014 Wiley Periodicals, Inc.
Durrer H.,Talstr. 7 |
Lachat J.,Anatomisches Institute |
Ochsenbein A.,Anatomisches Institute
Zeitschrift fur Feldherpetologie | Year: 2013
Video recordings of the terrestrial mating procedure of six pairs of the European treefrog were analysed. The filled vocal sac hampers the mounting of the male. Otherwise the terrestrial mating (hedgerow, stone etc.) has some advantages compared with the aquatic mating: no competition with other males or absence of predators like snakes and waterfrogs. © Laurenti-Verlag, Bielefeld.
PubMed | Anatomisches Institute
Type: Comparative Study | Journal: Pneumologie (Stuttgart, Germany) | Year: 2010
The histological composition of the Lamina propria in pigs - especially in the cranial fold of the glottis - gives reason to expect other phoniatric properties than in man. Age-related changes must be considered.