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Amiel T, Straub M, Neisius A, Netsch C, Secker A, Fisang C, Grunwald I. On the way to residue-free stone fragment removal after ureteroscopic laser lithotripsy - Significance of the hydrogel method. Eur Urol 2023. [DOI: 10.1016/s0302-2838(23)01109-0] [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: 02/12/2023]
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Amiel T, Straub M, Grunwald I. First in-human application of a novel hydrogel for the removal of residual kidney stone fragments. EUR UROL SUPPL 2022. [DOI: 10.1016/s2666-1683(22)00202-6] [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: 10/18/2022] Open
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Piayda K, Hornung M, Grunwald I, Sievert K, Bertog S, Sievert H. The learning curve for interventional cardiologists performing acute stroke interventions. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.2066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 11/13/2022] Open
Abstract
Abstract
Background
Endovascular treatment for acute stroke because of large vessel occlusion became the standard of care in certain clinical settings. Due to lack of trainees and specialized centers, interventional cardiologists joined multidisciplinary stroke teams, and contribute their extensive knowledge on acute cardiovascular interventions and catheter skills to optimize patient management and outcomes.
Purpose
To investigate if a learning curve exists for interventional cardiologists performing acute stroke interventions.
Methods
Consecutive patients undergoing acute endovascular stroke treatment from 07/2012 – 10/2020 at our center were reviewed. The interventional approach, lesion preparation and material selection were at the discretion of the performing cardiologist. Baseline characteristics, procedural information and in-hospital outcomes were retrospectively collected. Cases were chronologically sorted, divided into quartiles and outcomes were compared.
Results
One-hundred-thirteen patients underwent endovascular procedures for acute stroke treatment. Patients were 72.9 SD 13.3 years old, and 51.5% were female. NIHSS at baseline was 15 [12–18]. In 92% the blood flow of the anterior circulation was affected. The door to needle (DTN) time decreased over time (Q1 1:19h [range0:54–1:58] vs. Q2 0:49h [range 0:34–1:32] vs. Q3 1:13h [range 0:56–1:31] vs. Q4 0:54 [range 0:37–1:08], p=0.003), as well as the procedure duration (time of vascular access to (full) reperfusion Q1 1:24h [range 0:44–2:23] vs. Q2 0:52h [range 0:32–1:16] vs. Q3 0:49h [range 0:27–1:15] vs. 0:44h [range 0:28–1:17], p=0.014) and the use of contrast medium (Q1 103.3mL [range 75.1–147.7] vs. Q2 123.5mL [range 60.5–149.9] vs. Q3 99.8mL [range 73–132] vs. Q4 74.8 mL [range 52.4–94.6], p=0.014). A stent retriever only strategy was preferred in the early stages (Q1 42.8% vs. Q2 53.5% vs. Q3 32.1% vs. Q4 17.2%. p=0.010), whereas a stent retriever plus aspiration strategy (Q1 17.8% vs. Q2 14.2% vs. Q3 28.5% vs. Q4 50%, p=0.122) became more popular later on. The combined quality endpoint comprising of TICI IIb/III flow after the procedure, no embolization to new territories and no symptomatic intracranial bleeding was reached 84%, with no difference between groups. Vascular access site complications were low (overall 3.5%) and NIHSS prior to discharge was comparable (Q1 3 [range 1.75–7.25] vs. Q2 4.5 [range 1.75–8.25] vs. Q3 5 [range 2–8] vs. Q4 4 [range 2–7], p=0.725). In-hospital death occurred in 21 (18.5%) patients.
Conclusions
A learning curve for interventional cardiologist performing acute stroke interventions could be observed in terms of optimized management strategies such as a reduced door to needle time and procedural aspects, like decreased procedure duration and contrast medium use over time. However, the quality of care was unaffected and continuously high.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- K Piayda
- CardioVascular Center Frankfurt, Frankfurt, Germany
| | - M Hornung
- CardioVascular Center Frankfurt, Frankfurt, Germany
| | - I Grunwald
- University of Dundee, Dundee, United Kingdom
| | - K Sievert
- CardioVascular Center Frankfurt, Frankfurt, Germany
| | - S Bertog
- Minneapolis VA Health Care System, Minneapolis, United States of America
| | - H Sievert
- CardioVascular Center Frankfurt, Frankfurt, Germany
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Piayda K, Hornung M, Grunwald I, Sievert K, Bertog S, Sievert H. Regular hours vs. on-call endovascular interventions for acute stroke treatment: initial single-center experience by interventional cardiologists. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.2065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 11/14/2022] Open
Abstract
Abstract
Background
Endovascular treatment for acute stroke with large vessel occlusion became the mainstay therapy but remains limited due to lack of trainees and specialized centers. To offer this therapeutical option to a vast population, interventional cardiologists joined interdisciplinary stroke teams. Because of limited experience, it remains unclear if the timing of the procedure (i.e., regular hours vs. on-call time) may influence quality, time-effectiveness and outcomes.
Purpose
To investigate if the timing of the procedure (i.e., regular hours vs. on-call time) significantly influences procedural parameters and outcomes of patients undergoing acute endovascular stroke treatment.
Methods
Consecutive patients undergoing acute endovascular stroke treatment from 07/2012 – 10/2020, treated by cardiologists, were reviewed. Baseline characteristics, procedural aspects and clinical outcomes were retrospectively collected. Cases were divided into two groups, depending on the timing of the procedure: on-call time (OC, i.e., weekend days, public holidays and documented “call in” of the on-call service) vs. regular hours (RH, i.e., all other procedures) and outcomes subsequently compared.
Results
One-hundred-thirteen consecutive patients underwent endovascular treatment for acute stroke; of those 77 (68.1%) during regular hours and 36 (31.9%) during on-call time. Patients were in their early 70ies and risk factors such as arterial hypertension, diabetes mellitus, dyslipidemia and atrial fibrillation were evenly distributed. Modified Ranking Scale (mRS) at presentation was 5 in both groups and decreased to 3 at discharge. The anterior circulation was most often affected (RH: 90.9% vs. OC: 94.4%, p=0.518) and a stent retriever only strategy commonly chosen (RH: 42.8% vs. OC: 30.5%, p=0.211), followed by a combined approach of stent retriever use and aspiration (RH: 25.9% vs. OC: 27.7%, p=0.752). Door-to-needle time (RH: 0:55h IQR [0:45–1:22] vs. OC: 1:05h IQR [0:54–1:30], p=0.237) and procedure duration (RH: 0:48h IQR [0:30–1:25] vs. OC: 0:58h IQR [0:35–1:46], p=0.214) were comparable. Contrast agent use and radiation time (RH: 17.6 min IQR [11.7–29.3] vs. OC: 17.6 min IQR [12.1–33.6]) did not differ between groups, however patients in the OC group experienced a higher dose area product (RH: 4827mGy cm2 IQR [1567–14092] vs. 12727mGy cm2 [6732–18889], p<0.001). The combined quality endpoint, comprising of TICI IIb/III flow after the procedure, no embolization to new territory and no symptomatic intracranial bleeding during in hospital stay was met in 85.5% of patients in the RH group and 80.5% of the on-call group (p=0.485). Death during in-hospital stay was observed in 22% of patients in the RH group and 11.1% of the OC group (p=0.163).
Conclusions
Endovascular intervention for acute stroke treatment during on-call time is as effective and safe as if performed during regular hours but associated with a higher dose area product.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- K Piayda
- CardioVascular Center Frankfurt, Frankfurt, Germany
| | - M Hornung
- CardioVascular Center Frankfurt, Frankfurt, Germany
| | - I Grunwald
- University of Dundee, Dundee, United Kingdom
| | - K Sievert
- CardioVascular Center Frankfurt, Frankfurt, Germany
| | - S Bertog
- Minneapolis VA Health Care System, Minneapolis, United States of America
| | - H Sievert
- CardioVascular Center Frankfurt, Frankfurt, Germany
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Ständert V, Borcherding K, Bormann N, Schmidmaier G, Grunwald I, Wildemann B. Antibiotic-loaded amphora-shaped pores on a titanium implant surface enhance osteointegration and prevent infections. Bioact Mater 2021; 6:2331-2345. [PMID: 33553819 PMCID: PMC7840776 DOI: 10.1016/j.bioactmat.2021.01.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 01/04/2021] [Accepted: 01/10/2021] [Indexed: 12/13/2022] Open
Abstract
Artificial prostheses for joint replacement are indispensable in orthopedic surgery. Unfortunately, the implanted surface is attractive to not only host cells but also bacteria. To enable better osteointegration, a mechanically stable porous structure was created on a titanium surface using laser treatment and metallic silver particles were embedded in a hydrophilic titanium oxide layer on top. The laser structuring resulted in unique amphora-shaped pores. Due to their hydrophilic surface conditions and capillary forces, the pores can be loaded preoperative with the antibiotic of choice/need, such as gentamicin. Cytotoxicity and differentiation assays with primary human osteoblast-like cells revealed no negative effect of the surface modification with or without gentamicin loading. An in vivo biocompatibility study showed significantly enhanced osteointegration as measured by push-out testing and histomorphometry 56 days after the implantation of the K-wires into rat femora. Using a S. aureus infection model, the porous, silver-coated K-wires slightly reduced the signs of bone destruction, while the wires were still colonized after 28 days. Loading the amphora-shaped pores with gentamicin significantly reduced the histopathological signs of bone destruction and no bacteria were detected on the wires. Taken together, this novel surface modification can be applied to new or established orthopedic implants. It enables preoperative loading with the antibiotic of choice/need without further equipment or post-coating, and supports osteointegration without a negative effect of the released dug, such as gentamicin.
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Affiliation(s)
- Viviane Ständert
- Julius Wolff Institute, BIH Center for Regenerative Therapies, Charité, Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, 13353, Berlin, Germany
| | - Kai Borcherding
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), 28359, Bremen, Germany
| | - Nicole Bormann
- Julius Wolff Institute, BIH Center for Regenerative Therapies, Charité, Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, 13353, Berlin, Germany
| | - Gerhard Schmidmaier
- Center for Orthopedics, Trauma Surgery and Spinal Cord Injury, HTRG - Heidelberg Trauma Research Group, Heidelberg University Hospital, 69118, Heidelberg, Germany
| | - Ingo Grunwald
- Industrial and Environmental Biology, Hochschule Bremen-City University of Applied Sciences, 28199, Bremen, Germany
| | - Britt Wildemann
- Julius Wolff Institute, BIH Center for Regenerative Therapies, Charité, Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, 13353, Berlin, Germany
- Experimental Trauma Surgery, Department of Trauma, Hand and Reconstructive Surgery, Jena University Hospital, Friedrich Schiller University Jena, 07747, Jena, Germany
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Böker KO, Richter K, Jäckle K, Taheri S, Grunwald I, Borcherding K, von Byern J, Hartwig A, Wildemann B, Schilling AF, Lehmann W. Current State of Bone Adhesives-Necessities and Hurdles. Materials (Basel) 2019; 12:E3975. [PMID: 31801225 PMCID: PMC6926991 DOI: 10.3390/ma12233975] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 11/20/2019] [Accepted: 11/27/2019] [Indexed: 02/06/2023]
Abstract
The vision of gluing two bone fragments with biodegradable and biocompatible adhesives remains highly fascinating and attractive to orthopedic surgeons. Possibly shorter operation times, better stabilization, lower infection rates, and unnecessary removal make this approach very appealing. After 30 years of research in this field, the first adhesive systems are now appearing in scientific reports that may fulfill the comprehensive requirements of bioadhesives for bone. For a successful introduction into clinical application, special requirements of the musculoskeletal system, challenges in the production of a bone adhesive, as well as regulatory hurdles still need to be overcome. In this article, we will give an overview of existing synthetic polymers, biomimetic, and bio-based adhesive approaches, review the regulatory hurdles they face, and discuss perspectives of how bone adhesives could be efficiently introduced into clinical application, including legal regulations.
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Affiliation(s)
- Kai O. Böker
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Robert Koch Straße 40, 37075 Göttingen, Germany; (K.J.); (S.T.); (A.F.S.); (W.L.)
| | - Katharina Richter
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Wiener Straße 12, 28359 Bremen, Germany; (K.R.); (K.B.); (A.H.)
| | - Katharina Jäckle
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Robert Koch Straße 40, 37075 Göttingen, Germany; (K.J.); (S.T.); (A.F.S.); (W.L.)
| | - Shahed Taheri
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Robert Koch Straße 40, 37075 Göttingen, Germany; (K.J.); (S.T.); (A.F.S.); (W.L.)
| | - Ingo Grunwald
- Industrial and Environmental Biology, Hochschule Bremen—City University of Applied Sciences, Neustadtswall 30, 28199 Bremen, Germany;
| | - Kai Borcherding
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Wiener Straße 12, 28359 Bremen, Germany; (K.R.); (K.B.); (A.H.)
| | - Janek von Byern
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Donaueschingenstrasse 13, 1200 Vienna, Austria;
- Faculty of Life Science, University of Vienna, Core Facility Cell Imaging and Ultrastructure Research, Althanstrasse 14, 1090 Vienna, Austria
| | - Andreas Hartwig
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Wiener Straße 12, 28359 Bremen, Germany; (K.R.); (K.B.); (A.H.)
- Department 2 Biology/Chemistry, University of Bremen, Leobener Straße 3, 28359 Bremen, Germany
| | - Britt Wildemann
- Experimental Trauma Surgery, University Hospital Jena, 07747 Jena, Germany;
| | - Arndt F. Schilling
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Robert Koch Straße 40, 37075 Göttingen, Germany; (K.J.); (S.T.); (A.F.S.); (W.L.)
| | - Wolfgang Lehmann
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Robert Koch Straße 40, 37075 Göttingen, Germany; (K.J.); (S.T.); (A.F.S.); (W.L.)
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Borcherding K, Marx D, Gätjen L, Bormann N, Wildemann B, Specht U, Salz D, Thiel K, Grunwald I. Burst Release of Antibiotics Combined with Long-Term Release of Silver Targeting Implant-Associated Infections: Design, Characterization and in vitro Evaluation of Novel Implant Hybrid Surface. Materials (Basel) 2019; 12:E3838. [PMID: 31766488 PMCID: PMC6926566 DOI: 10.3390/ma12233838] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 10/18/2019] [Accepted: 11/19/2019] [Indexed: 02/06/2023]
Abstract
Implant-associated infections represent a serious risk in human medicine and can lead to complications, revisions and in worst cases, amputations. To target these risks, the objective was to design a hybrid implant surface that allows a local burst release of antibiotics combined with long-term antimicrobial activity based on silver. The efficacy should be generated with simultaneous in vitro cytocompatibility. The investigations were performed on titanium K-wires and plates and gentamicin was selected as an illustrative antibiotic. A gentamicin depot (max 553 µg/cm2) was created on the surface using laser structuring. The antibiotic was released within 15 min in phosphate buffered saline (PBS) or agar medium. Metallic silver particles (4 µg/cm2) in a titanium dioxide layer were deposited using plasma vapor deposition (PVD). About 16% of the silver was released within 28 days in the agar medium. The local efficacy of the incorporated silver was demonstrated in a direct contact assay with a reduction of more than 99.99% (Escherichia coli). The local efficacy of the hybrid surface was confirmed in a zone of inhibition (ZOI) assay using Staphylococcus cohnii. The biocompatibility of the hybrid surface was proven using fibroblasts and osteoblasts as cell systems. The hybrid surface design seems to be promising as treatment of implant-associated infections, considering the achieved amount and release behavior of the active ingredients (gentamicin, silver). The generated in vitro results (efficacy, biocompatibility) proofed the concept. Further in vivo studies will be necessary translate the hybrid surface towards clinical applied research.
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Affiliation(s)
- Kai Borcherding
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), 28359 Bremen, Germany; (D.M.); (L.G.); (U.S.); (D.S.); (K.T.)
| | - Dennis Marx
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), 28359 Bremen, Germany; (D.M.); (L.G.); (U.S.); (D.S.); (K.T.)
| | - Linda Gätjen
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), 28359 Bremen, Germany; (D.M.); (L.G.); (U.S.); (D.S.); (K.T.)
| | - Nicole Bormann
- Julius Wolff Institute, BIH Center for Regenerative Therapies, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 13353 Berlin, Germany; (N.B.); (B.W.)
| | - Britt Wildemann
- Julius Wolff Institute, BIH Center for Regenerative Therapies, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 13353 Berlin, Germany; (N.B.); (B.W.)
- Experimental Trauma Surgery, Department of Trauma, Hand and Reconstructive Surgery, University Hospital Jena, 07747 Jena, Germany
| | - Uwe Specht
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), 28359 Bremen, Germany; (D.M.); (L.G.); (U.S.); (D.S.); (K.T.)
| | - Dirk Salz
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), 28359 Bremen, Germany; (D.M.); (L.G.); (U.S.); (D.S.); (K.T.)
| | - Karsten Thiel
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), 28359 Bremen, Germany; (D.M.); (L.G.); (U.S.); (D.S.); (K.T.)
| | - Ingo Grunwald
- Industrial and Environmental Biology, Hochschule Bremen-City University of Applied Sciences, Neustadswall 30, 28199 Bremen, Germany;
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Stößlein S, Grunwald I, Khachikyan A, Faßbender F, Thiel K, Hartwig A. Preparation and pH‐Dependent Properties of Hydrogels Based on Acidic Copolymers with PEG Side Chains and α‐Cyclodextrin. MACROMOL CHEM PHYS 2019. [DOI: 10.1002/macp.201900081] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Sebastian Stößlein
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials Wiener Straße 12 28359 Bremen Germany
- Department 2 Biology/ChemistryUniversity of Bremen Leobener Straße 2 28359 Bremen Germany
| | - Ingo Grunwald
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials Wiener Straße 12 28359 Bremen Germany
- Department 2 Biology/ChemistryUniversity of Bremen Leobener Straße 2 28359 Bremen Germany
| | - Alexander Khachikyan
- Max Planck Institute for Marine Microbiology Celsiusstraße 1 28359 Bremen Germany
| | - Fabian Faßbender
- Department 2 Biology/ChemistryUniversity of Bremen Leobener Straße 2 28359 Bremen Germany
| | - Karsten Thiel
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials Wiener Straße 12 28359 Bremen Germany
| | - Andreas Hartwig
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials Wiener Straße 12 28359 Bremen Germany
- Department 2 Biology/ChemistryUniversity of Bremen Leobener Straße 2 28359 Bremen Germany
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Stößlein S, Grunwald I, Stelten J, Hartwig A. In-situ determination of time-dependent alginate-hydrogel formation by mechanical texture analysis. Carbohydr Polym 2019; 205:287-294. [DOI: 10.1016/j.carbpol.2018.10.056] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 10/18/2018] [Accepted: 10/19/2018] [Indexed: 12/19/2022]
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Hein S, Schoeb DS, Grunwald I, Richter K, Haberstroh J, Seidl M, Bronsert P, Wetterauer U, Schoenthaler M, Miernik A. Viability and biocompatibility of an adhesive system for intrarenal embedding and endoscopic removal of small residual fragments in minimally-invasive stone treatment in an in vivo pig model. World J Urol 2018; 36:673-680. [PMID: 29368229 DOI: 10.1007/s00345-018-2188-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2017] [Accepted: 01/19/2018] [Indexed: 11/25/2022] Open
Abstract
PURPOSE To evaluate the viability and biocompatibility of a novel, patented bioadhesive system for intrarenal embedding and retrieval of residual fragments after endoscopic lithotripsy. Complete stone clearance via active removal of residual fragments (RF) after intracorporeal laser lithotripsy may be time-consuming and fail in many cases. Therefore, the novel adhesive has been developed and evaluated for the first time in an in vivo pig model in the present work. METHODS Four female domestic pigs underwent flexible ureteroscopy (RIRS) or percutaneous nephrolithotomy (PNL) under general anesthesia (8 kidneys, 4 × RIRS, 4 × PNL) evaluating the bioadhesive system. INTERVENTIONS RIRS without adhesive system (sham procedure, kidney I); 3 × RIRS using the bioadhesive system (kidneys II-IV); and 4 × PNL using the bioadhesive system (V-VIII). We endoscopically inserted standardized human stone probes followed by comminution using Ho:YAG lithotripsy. The bioadhesive (kidney II-VIII) was then applied and the adhesive-stone fragment complex extracted. After nephrectomy, all kidneys were evaluated by two independent, blinded pathologists. Endpoints were the procedure's safety and adhesive system's biocompatibility. RESULTS We observed no substantial toxic effects. We were able to embed and remove 80-90% of fragments. However, because of the pig's hampering pyelocaliceal anatomy, a quantified, proportional assessment of the embedded fragments was compromised. CONCLUSIONS For the first time, we demonstrated the proven feasibility and safety of this novel bioadhesive system for embedding and endoscopically removing small RF in conjunction with a lack of organ toxicity in vivo.
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Affiliation(s)
- Simon Hein
- Department of Urology, Faculty of Medicine, Medical Center, University of Freiburg (Institution to Which this Work is Attributed), Hugstetterstr. 55, 79106, Freiburg, Germany.
| | - Dominik Stefan Schoeb
- Department of Urology, Faculty of Medicine, Medical Center, University of Freiburg (Institution to Which this Work is Attributed), Hugstetterstr. 55, 79106, Freiburg, Germany
| | - Ingo Grunwald
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Wiener Str. 12, 28359, Bremen, Germany
| | - Katharina Richter
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Wiener Str. 12, 28359, Bremen, Germany
| | - Jörg Haberstroh
- Experimental Surgery, Faculty of Medicine, CEMT-FR, Medical Center, University of Freiburg, Breisacher Str. 66, 79106, Freiburg, Germany
| | - Maximilian Seidl
- Faculty of Medicine, Institute for Surgical Pathology, Medical Center, University of Freiburg, Breisacher Str. 115a, 79106, Freiburg, Germany
| | - Peter Bronsert
- Faculty of Medicine, Institute for Surgical Pathology, Medical Center, University of Freiburg, Breisacher Str. 115a, 79106, Freiburg, Germany
| | - Ulrich Wetterauer
- Department of Urology, Faculty of Medicine, Medical Center, University of Freiburg (Institution to Which this Work is Attributed), Hugstetterstr. 55, 79106, Freiburg, Germany
| | - Martin Schoenthaler
- Department of Urology, Faculty of Medicine, Medical Center, University of Freiburg (Institution to Which this Work is Attributed), Hugstetterstr. 55, 79106, Freiburg, Germany
| | - Arkadiusz Miernik
- Department of Urology, Faculty of Medicine, Medical Center, University of Freiburg (Institution to Which this Work is Attributed), Hugstetterstr. 55, 79106, Freiburg, Germany
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von Byern J, Mebs D, Heiss E, Dicke U, Wetjen O, Bakkegard K, Grunwald I, Wolbank S, Mühleder S, Gugerell A, Fuchs H, Nürnberger S. Salamanders on the bench – A biocompatibility study of salamander skin secretions in cell cultures. Toxicon 2017; 135:24-32. [DOI: 10.1016/j.toxicon.2017.05.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 05/22/2017] [Accepted: 05/23/2017] [Indexed: 11/28/2022]
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12
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von Byern J, Grunwald I, Kosok M, Saporito RA, Dicke U, Wetjen O, Thiel K, Borcherding K, Kowalik T, Marchetti-Deschmann M. Chemical characterization of the adhesive secretions of the salamander Plethodon shermani (Caudata, Plethodontidae). Sci Rep 2017; 7:6647. [PMID: 28751633 PMCID: PMC5532285 DOI: 10.1038/s41598-017-05473-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Accepted: 05/26/2017] [Indexed: 11/09/2022] Open
Abstract
Salamanders have developed a wide variety of antipredator mechanisms, including tail autotomy, colour patterns, and noxious skin secretions. As an addition to these tactics, the red-legged salamander (Plethodon shermani) uses adhesive secretions as part of its defensive strategy. The high bonding strength, the fast-curing nature, and the composition of the biobased materials makes salamander adhesives interesting for practical applications in the medical sector. To understand the adhesive secretions of P. shermani, its components were chemically analysed by energy dispersive X-ray spectroscopy (EDX), inductively coupled plasma mass spectrometry (ICP-MS), amino acid analysis, and spectroscopy (ATR-IR, Raman). In addition, proteins were separated by gel-electrophoresis and selected spots were characterised by peptide mass fingerprinting. The salamander secretion contains a high amount of water and predominantly proteins (around 77% in the dry stage). The gel-electrophoresis and peptide mass fingerprint analyses revealed a de novo set of peptides/proteins, largely with a pI between 5.0 and 8.0 and a molecular mass distribution between 10 and 170 kDa. Only low homologies with other proteins present in known databases could be identified. The results indicate that the secretions of the salamander Plethodon clearly differ chemically from those shown for other glue-producing terrestrial or marine species and thus represent a unique glue system.
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Affiliation(s)
- Janek von Byern
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Donaueschingenstrasse 13, 1200, Vienna, Austria
- University of Vienna, Faculty of Life Science, Core Facility Cell Imaging and Ultrastructure Research, Althanstrasse 14, 1090, Vienna, Austria
| | - Ingo Grunwald
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Department of Adhesive Bonding Technology and Surfaces, Adhesives and Polymer Chemistry, Wiener Straße 12, 28359, Bremen, Germany.
| | - Max Kosok
- Vienna University of Technology, Institute of Chemical Technologies and Analytics, Karlsplatz 13, 1040, Vienna, Austria
| | - Ralph A Saporito
- John Carroll University, Department of Biology, University Heights, Ohio, 44118, USA
| | - Ursula Dicke
- University of Bremen, Brain Research Institute, Department of Behavioral Physiology, Bibliothekstraße 1, 28359, Bremen, Germany
| | - Oliver Wetjen
- University of Bremen, Brain Research Institute, Department of Behavioral Physiology, Bibliothekstraße 1, 28359, Bremen, Germany
| | - Karsten Thiel
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Department of Adhesive Bonding Technology and Surfaces, Adhesives and Polymer Chemistry, Wiener Straße 12, 28359, Bremen, Germany
| | - Kai Borcherding
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Department of Adhesive Bonding Technology and Surfaces, Adhesives and Polymer Chemistry, Wiener Straße 12, 28359, Bremen, Germany
| | - Thomas Kowalik
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Department of Adhesive Bonding Technology and Surfaces, Adhesives and Polymer Chemistry, Wiener Straße 12, 28359, Bremen, Germany
| | - Martina Marchetti-Deschmann
- Vienna University of Technology, Institute of Chemical Technologies and Analytics, Karlsplatz 13, 1040, Vienna, Austria
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Schoeb DS, Schoenthaler M, Schlager D, Petzold R, Richter K, Grunwald I, Wetterauer U, Miernik A, Hein S. New for Old-Coagulum Lithotomy vs a Novel Bioadhesive for Complete Removal of Stone Fragments in a Comparative Study in an Ex Vivo Porcine Model. J Endourol 2017; 31:611-616. [PMID: 28385037 DOI: 10.1089/end.2017.0125] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVES To evaluate a recently reported new bioadhesive system for the retrieval of small residual fragments (RFs) after intracorporeal lithotripsy, we systematically compared this system with coagulum lithotomy in retrograde intrarenal surgery. MATERIALS AND METHODS We extracted 30 human stone fragments (≤1 mm) in an ex vivo porcine kidney model using a flexible ureteroscope for three groups: (1) the novel bioadhesive, (2) autologous blood as a natural adhesive, and (3) (control group) a conventional retrieval basket. Each group consisted of 15 test runs. Outcomes were evaluated regarding the macroscopic stone-free rate (SFR), retrieval time, and number of ureteral passages. RESULTS For groups 1 and 2, a significant advantage in stone clearance, mean retrieval time, and number of retrievals was detected compared to the control group (p = 0.001). The time and number of retrievals were significantly lower in group 1 (10:36 minutes, p = 0.001) than in group 2 (26:12 minutes, p = 0.001), with shorter clotting time and better visibility. CONCLUSIONS These data show the general feasibility of intrarenal RF embedding to improve the SFR. Our data furthermore suggest the superiority of the artificial bioadhesive embedding agent over the application of native blood. Further in vivo studies and other research are necessary to confirm the adhesive's effect in patients.
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Affiliation(s)
- Dominik Stefan Schoeb
- 1 Department of Urology, Faculty of Medicine, Medical Center-University of Freiburg , Freiburg, Germany
| | - Martin Schoenthaler
- 1 Department of Urology, Faculty of Medicine, Medical Center-University of Freiburg , Freiburg, Germany
| | - Daniel Schlager
- 1 Department of Urology, Faculty of Medicine, Medical Center-University of Freiburg , Freiburg, Germany
| | - Ralf Petzold
- 1 Department of Urology, Faculty of Medicine, Medical Center-University of Freiburg , Freiburg, Germany
| | - Katharina Richter
- 2 Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM , Bremen, Germany
| | - Ingo Grunwald
- 2 Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM , Bremen, Germany
| | - Ulrich Wetterauer
- 1 Department of Urology, Faculty of Medicine, Medical Center-University of Freiburg , Freiburg, Germany
| | - Arkadiusz Miernik
- 1 Department of Urology, Faculty of Medicine, Medical Center-University of Freiburg , Freiburg, Germany
| | - Simon Hein
- 1 Department of Urology, Faculty of Medicine, Medical Center-University of Freiburg , Freiburg, Germany
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Nürnberger S, Rentenberger C, Thiel K, Schädl B, Grunwald I, Ponomarev I, Marlovits S, Meyer C, Barnewitz D. Giant crystals inside mitochondria of equine chondrocytes. Histochem Cell Biol 2016; 147:635-649. [PMID: 28013370 PMCID: PMC5400799 DOI: 10.1007/s00418-016-1516-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/09/2016] [Indexed: 01/20/2023]
Abstract
The present study reports for the first time the presence of giant crystals in mitochondria of equine chondrocytes. These structures show dark contrast in TEM images as well as a granular substructure of regularly aligned 1-2 nm small units. Different zone axes of the crystalline structure were analysed by means of Fourier transformation of lattice-resolution TEM images proving the crystalline nature of the structure. Elemental analysis reveals a high content of nitrogen referring to protein. The outer shape of the crystals is geometrical with an up to hexagonal profile in cross sections. It is elongated, spanning a length of several micrometres through the whole cell. In some chondrocytes, several crystals were found, sometimes combined in a single mitochondrion. Crystals were preferentially aligned along the long axis of the cells, thus appearing in the same orientation as the chondrocytes in the tissue. Although no similar structures have been found in the cartilage of any other species investigated, they have been found in cartilage repair tissue formed within a mechanically stimulated equine chondrocyte construct. Crystals were mainly located in superficial regions of cartilage, especially in joint regions of well-developed superficial layers, more often in yearlings than in adult horses. These results indicate that intramitochondrial crystals are related to the high mechanical stress in the horse joint and potentially also to the increased metabolic activity of immature individuals.
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Affiliation(s)
- S Nürnberger
- Department of Trauma Surgery, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria. .,Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, AUVA Research Center, Donaueschingenstrasse 13, 1200, Vienna, Austria. .,University Clinic of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090, Vienna, Austria. .,Austrian Cluster for Tissue Regeneration, Vienna, Austria.
| | - C Rentenberger
- Physics of Nanostructured Materials, Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria
| | - K Thiel
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Wiener Strasse 12, 28359 Bremen, Germany
| | - B Schädl
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, AUVA Research Center, Donaueschingenstrasse 13, 1200, Vienna, Austria.,University Clinic of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - I Grunwald
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Wiener Strasse 12, 28359 Bremen, Germany
| | - I Ponomarev
- Research Centre for Medical Technics and Biotechnology, Geranienweg 7, 99947, Bad Langensalza, Germany
| | - St Marlovits
- Department of Trauma Surgery, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - Ch Meyer
- Clinic and Polyclinic for Traumatology, University of Giessen, Rudolf-Buchheim-Straße 7, 35385, Giessen, Germany.,Orthopaedic and Trauma Surgery, Klinikum Saarbrücken, Winterberg 1, 66119, Saarbrücken, Germany
| | - D Barnewitz
- Research Centre for Medical Technics and Biotechnology, Geranienweg 7, 99947, Bad Langensalza, Germany
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von Byern J, Dorrer V, Merritt DJ, Chandler P, Stringer I, Marchetti-Deschmann M, McNaughton A, Cyran N, Thiel K, Noeske M, Grunwald I. Characterization of the Fishing Lines in Titiwai (=Arachnocampa luminosa Skuse, 1890) from New Zealand and Australia. PLoS One 2016; 11:e0162687. [PMID: 27973586 PMCID: PMC5156358 DOI: 10.1371/journal.pone.0162687] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 08/27/2016] [Indexed: 11/29/2022] Open
Abstract
Animals use adhesive secretions in a plethora of ways, either for attachment, egg anchorage, mating or as either active or passive defence. The most interesting function, however, is the use of adhesive threads to capture prey, as the bonding must be performed within milliseconds and under unsuitable conditions (movement of prey, variable environmental conditions, unfavourable attack angle, etc.) to be nonetheless successful. In the following study a detailed characterization of the prey capture system of the world-renowned glowworm group Arachnocampa from the macroscopic to the ultrastructural level is performed. The data reveal that the adhesive droplets consist mostly of water and display hygroscopic properties at varying humidity levels. The droplet core of Arachnocampa luminosa includes a certain amount of the elements sodium, sulphur and potassium (beside carbon, oxygen and nitrogen), while a different element composition is found in the two related species A. richardsae and A. tasmaniensis. Evidence for lipids, carbohydrates and proteins was negative on the histochemical level, however X-ray photoelectron spectroscopy confirm the presence of peptides within the droplet content. Different to earlier assumptions, the present study indicates that rather than oxalic acid, urea or uric acid are present in the adhesive droplets, presumably originating from the gut. Comparing the capture system in Arachnocampa with those of orb-spiders, large differences appear not only regarding the silky threads, but also, in the composition, hygroscopic properties and size of the mucous droplets.
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Affiliation(s)
- Janek von Byern
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Vienna, Austria
- University of Vienna, Faculty of Life Science, Core Facility Cell Imaging & Ultrastructure Research, Vienna, Austria
- * E-mail:
| | - Victoria Dorrer
- Technical University Wien, Institute of Chemical Technologies and Analytics, Vienna, Austria
| | - David J. Merritt
- The University of Queensland, School of Biological Sciences, Brisbane, Queensland, Australia
| | | | - Ian Stringer
- Department of Conservation, Wellington, New Zealand
| | | | - Andrew McNaughton
- University of Otago, School of Medical Sciences, Department of Anatomy, Otago Centre for Confocal Microscopy, Otago, New Zealand
| | - Norbert Cyran
- University of Vienna, Faculty of Life Science, Core Facility Cell Imaging & Ultrastructure Research, Vienna, Austria
| | - Karsten Thiel
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Department of Adhesive Bonding Technology and Surfaces, Bremen, Germany
| | - Michael Noeske
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Department of Adhesive Bonding Technology and Surfaces, Bremen, Germany
| | - Ingo Grunwald
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Department of Adhesive Bonding Technology and Surfaces, Bremen, Germany
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Betz O, Maurer A, Verheyden AN, Schmitt C, Kowalik T, Braun J, Grunwald I, Hartwig A, Neuenfeldt M. First protein and peptide characterization of the tarsal adhesive secretions in the desert locust, Schistocerca gregaria, and the Madagascar hissing cockroach, Gromphadorhina portentosa. Insect Mol Biol 2016; 25:541-9. [PMID: 27126627 DOI: 10.1111/imb.12241] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Peptides and proteins have been largely neglected in the analysis of insect tarsal adhesives. After extraction of the protein fraction of the tarsal secretion of the desert locust, Schistocerca gregaria, and Madagascar hissing cockroach, Gromphadorhina portentosa, we combined Fourier transform infrared spectroscopy (FTIR), sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) and matrix-assisted laser desorption/ionization mass spectrometry (MALDI-TOF MS) analyses for protein mass detection. In both these insects, SDS-PAGE analysis revealed several protein bands ranging from 8-190 kDa in both the tarsal secretion and the tibia control sample. Two (S. gregaria) and one (G. portentosa) protein bands exclusively occurred in the tarsal secretion and can be considered to belong to peptides and proteins specific to this secretion. MALDI-TOF analyses revealed 83 different proteins/peptides of 1-7 kDa in S. gregaria, and 48 of 1-11 kDa in G. portentosa. 59 (S. gregaria) and 27 (G. portentosa) proteins exclusively occurred in the tarsal secretion. In G. portentosa, a characteristic series of signal peaks occurred in the range of c. 10-12 kDa, each peak being approximately 160 Da apart. Such a pattern is indicative of proteins modified by glycosylation. Our approach demonstrates that extensive sampling involving considerable time and manpower to sample the adhesive fluid directly from the tarsi opens up a perspective for extracting peptides and proteins in sufficient quantities. This makes them accessible to the field of proteomics and thus to elucidate their possible function in the adhesive process.
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Affiliation(s)
- O Betz
- Professur für Evolutionsbiologie der Invertebraten, Universität Tübingen, Institut für Evolution und Ökologie, Tübingen, Germany
| | - A Maurer
- Medizinisch-Naturwissenschaftliches Forschungszentrum, Tübingen, Germany
| | - A N Verheyden
- Professur für Evolutionsbiologie der Invertebraten, Universität Tübingen, Institut für Evolution und Ökologie, Tübingen, Germany
| | - C Schmitt
- Professur für Evolutionsbiologie der Invertebraten, Universität Tübingen, Institut für Evolution und Ökologie, Tübingen, Germany
| | - T Kowalik
- Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung, Bremen, Germany
| | - J Braun
- Professur für Evolutionsbiologie der Invertebraten, Universität Tübingen, Institut für Evolution und Ökologie, Tübingen, Germany
| | - I Grunwald
- Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung, Bremen, Germany
| | - A Hartwig
- Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung, Bremen, Germany
| | - M Neuenfeldt
- Professur für Evolutionsbiologie der Invertebraten, Universität Tübingen, Institut für Evolution und Ökologie, Tübingen, Germany
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Reiche W, Grunwald I, Hermann K, Deinzer M, Reith W. Oligodendrogliomas: A comparison of CT and MR imaging features with histological malignancy grading in 20 cases: A pathoradiological study. Acta Radiol 2016. [DOI: 10.1258/rsmacta.43.5.474] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Purpose: To study the pattern of contrast enhancement in MR and CT of oligodendrogliomas and to compare this with other imaging findings and with histopathological grading criteria. Material and Methods: 20 patients with oligodendrogliomas (12 low-grade WHO II and 8 anaplastic WHO III) were reviewed. 20 complete MR investigations, 20 non-enhanced CT studies and 16 CTs after contrast enhancement were estimated blindly without knowledge of the tumour histological grades. Results: All anaplastic oligodendrogliomas showed tumour contrast enhancement on MR and CT images. Also in 6/12 low-grade oligodendrogliomas the contrast was enhanced on MR imaging. In 5 of these, tumour calcifications were detected by CT. The remaining 6/12 WHO grade II cases showed no significant MR contrast enhancement. Of the oligodendrogliomas grade II, CT showed contrast uptake in 3 cases and no enhancement in 6, while in 3 cases postcontrast CT was not available. A comparison of contrast enhancement with tumour grade resulted in a p-value of 0.042 for MR and of 0.011 for CT. A combined statistical test of tumour grade and calcifications detected by CT compared with MR contrast enhancement showed a significant correlation ( p=0.014). Conclusion: These data demonstrated that a clear grading of oligodendrogliomas based on the image criterion MR contrast enhancement was not possible. We suppose that, besides tumour neovascularisation, additional factors such as calcifications may disturb the blood-brain barrier.
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Affiliation(s)
- W. Reiche
- Department of Neuroradiology, Radiological Clinic, Saarland University Clinic, Homburg/Saar, Germany
| | - I. Grunwald
- Department of Neuroradiology, Radiological Clinic, Saarland University Clinic, Homburg/Saar, Germany
| | - K. Hermann
- Department of Neuroradiology, Radiological Clinic, Saarland University Clinic, Homburg/Saar, Germany
| | - M. Deinzer
- Department of Neuroradiology, Radiological Clinic, Saarland University Clinic, Homburg/Saar, Germany
| | - W. Reith
- Department of Neuroradiology, Radiological Clinic, Saarland University Clinic, Homburg/Saar, Germany
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18
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Hein S, Schoenthaler M, Wilhelm K, Schlager D, Thiel K, Brandmann M, Richter K, Grunwald I, Wetterauer U, Miernik A. Novel Biocompatible Adhesive for Intrarenal Embedding and Endoscopic Removal of Small Residual Fragments after Minimally Invasive Stone Treatment in an Ex Vivo Porcine Kidney Model: Initial Evaluation of a Prototype. J Urol 2016; 196:1772-1777. [PMID: 27256206 DOI: 10.1016/j.juro.2016.05.094] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/25/2016] [Indexed: 11/17/2022]
Abstract
PURPOSE Residual fragments related to endoscopic intracorporeal lithotripsy are a challenging problem. The impact of residual fragments remains a subject of discussion and growing evidence highlights that they have a central role in recurrent stone formation. Therefore, we developed a novel bioadhesive system for intrarenal embedding and retrieval of residual fragments after endoscopic lithotripsy in an ex vivo porcine kidney model. MATERIALS AND METHODS In a standardized setting 30 human stone fragments 1 mm or less were inserted in the lower pole of an ex vivo porcine kidney model. We assessed the extraction efficacy of flexible ureteroscopy using the bioadhesive system in 15 preparations and a conventional retrieval basket in 15. Outcomes were compared regarding the endoscopic and macroscopic stone-free rate, and overall time of retrieval. RESULTS Embedding and retrieving the residual fragment-bioadhesive complex were feasible in all trial runs. We observed no adverse effects such as adhesions between the adhesive and the renal collecting system or the instruments used. The stone-free rate was 100% and 60% in the bioadhesive and conventional retrieval groups, respectively (p = 0.017). Mean retrieval time was significantly shorter at 10 minutes 33 seconds vs 36 minutes 56 seconds in the bioadhesive group vs the conventional group (p = 0.001). CONCLUSIONS This novel method involving adhesive based complete removal of residual fragments from the collecting system has proved to be feasible. Our evaluation in a porcine kidney model revealed that this technology performed well. Further tests, including inpatient studies, are required to thoroughly evaluate the benefit and potential drawbacks of bioadhesive based extraction of residual fragments after intracorporeal lithotripsy.
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Affiliation(s)
- Simon Hein
- Department of Urology, Medical Center, University of Freiburg, Freiburg, Germany; Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (KT, MB, KR, IG), Bremen, Germany.
| | - Martin Schoenthaler
- Department of Urology, Medical Center, University of Freiburg, Freiburg, Germany; Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (KT, MB, KR, IG), Bremen, Germany
| | - Konrad Wilhelm
- Department of Urology, Medical Center, University of Freiburg, Freiburg, Germany; Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (KT, MB, KR, IG), Bremen, Germany
| | - Daniel Schlager
- Department of Urology, Medical Center, University of Freiburg, Freiburg, Germany; Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (KT, MB, KR, IG), Bremen, Germany
| | - Karsten Thiel
- Department of Urology, Medical Center, University of Freiburg, Freiburg, Germany; Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (KT, MB, KR, IG), Bremen, Germany
| | - Maria Brandmann
- Department of Urology, Medical Center, University of Freiburg, Freiburg, Germany; Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (KT, MB, KR, IG), Bremen, Germany
| | - Katharina Richter
- Department of Urology, Medical Center, University of Freiburg, Freiburg, Germany; Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (KT, MB, KR, IG), Bremen, Germany
| | - Ingo Grunwald
- Department of Urology, Medical Center, University of Freiburg, Freiburg, Germany; Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (KT, MB, KR, IG), Bremen, Germany
| | - Ulrich Wetterauer
- Department of Urology, Medical Center, University of Freiburg, Freiburg, Germany; Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (KT, MB, KR, IG), Bremen, Germany
| | - Arkadiusz Miernik
- Department of Urology, Medical Center, University of Freiburg, Freiburg, Germany; Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (KT, MB, KR, IG), Bremen, Germany
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von Byern J, Dicke U, Heiss E, Grunwald I, Gorb S, Staedler Y, Cyran N. Morphological characterization of the glandular system in the salamander Plethodon shermani (Caudata, Plethodontidae). ZOOLOGY 2015; 118:334-47. [PMID: 26163863 DOI: 10.1016/j.zool.2015.04.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [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: 11/14/2014] [Revised: 02/22/2015] [Accepted: 04/03/2015] [Indexed: 10/23/2022]
Abstract
Amphibians have evolved a wide variety of mechanisms that provide a certain degree of protection against predators, including camouflage, tail autonomy, encounter behavior and noxious or toxic skin secretions. In addition to these strategies, some amphibians release a glue-like secretion onto the surface of their skin when threatened. While some information regarding the origin and production of these adhesive secretions is available for frogs such as Notaden bennetti, these aspects are only partially understood in salamanders. We contribute to an earlier study and provide additional information regarding the origin, production, and characterization of the adhesive secretion in the red-legged salamander (Plethodon shermani) at a microanatomical level. When stressed, this salamander secretes a milky, viscous liquid from its dorsal and ventral skin. This secretion is extremely adhesive and hardens within seconds upon exposure to air. This study describes two cutaneous gland types (mucous and granular) in the dorsal and ventral epithelial tissue that differ considerably in their secretory content. While the smaller mucous glands contains flocculent to granular material, mostly acidic glycoproteins, the granular glands synthesize various granules of differing size and density that consist of basic proteinaceous material. The results strongly indicate that the secretions of both gland types from the dorsal as well as the ventral side form the adhesive mucus in Plethodon shermani, consisting of basic and acidic glycoproteins, glycoconjugates with mannose and α-L-fucose residues as well as lipid components.
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Affiliation(s)
- Janek von Byern
- Center for Integrative Bioinformatics Vienna, Max F. Perutz Laboratories, Dr. Bohr Gasse 9, A-1030 Vienna, Austria; Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Donaueschingenstraße 13, A-1200 Vienna, Austria.
| | - Ursula Dicke
- Brain Research Institute, Department of Behavioral Physiology, University of Bremen, D-28334 Bremen, Germany
| | - Egon Heiss
- Department of Integrative Zoology, University of Vienna, Althanstraße 14, A-1090 Vienna, Austria; Universiteit Antwerpen, Department of Biology, B-2610 Antwerp, Belgium
| | - Ingo Grunwald
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Wiener Straße 12, D-28359 Bremen, Germany
| | - Stanislav Gorb
- Zoological Institute: Functional Morphology and Biomechanics, Christian Albrechts University of Kiel, Am Botanischen Garten 9, D-24118 Kiel, Germany
| | - Yannick Staedler
- Division of Structural and Functional Botany, Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, A-1030 Vienna, Austria
| | - Norbert Cyran
- Core Facility Cell Imaging & Ultrastructure Research, Faculty of Life Science, University of Vienna, Althanstraße 14, A-1090 Vienna, Austria
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Abstract
The results of the first chemical analysis of the adhesive of Lepas anatifera, a stalked barnacle, are presented. A variety of elements were identified in scanning electron microscopy with energy dispersive spectrometry (SEM-EDS) of the adhesive, including Na, Mg, Ca, Cl, S, Al, Si, K and Fe; however, protein-metal interactions were not detected in Raman spectra of the adhesive. Elemental signatures from SEM-EDS of L. anatifera adhesive glands were less varied. Phosphorous was mostly absent in adhesive samples; supporting previous studies showing that phosphoserines do not play a significant role in adult barnacle adhesion. Disulfide bridges arising from Cys dimers were also investigated; Raman analysis showed weak evidence for S-S bonds in L. anatifera. In addition, there was no calcium carbonate signal in the attenuated total reflectance Fourier transform infrared spectra of L. anatifera adhesive, unlike several previous studies in other barnacle species. Significant differences were observed between the Raman spectra of L. anatifera and Balanus crenatus; these and a range of Raman peaks in the L. anatifera adhesive are discussed. Polysaccharide was detected in L. anatifera adhesive but the significance of this awaits further experiments. The results demonstrate some of the diversity within barnacle species in the chemistry of their adhesives.
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Affiliation(s)
- Jaimie-Leigh Jonker
- School of Natural Sciences, National University of Ireland, Galway, Republic of Ireland
| | - Liam Morrison
- School of Natural Sciences, National University of Ireland, Galway, Republic of Ireland
| | - Edward P. Lynch
- School of Natural Sciences, National University of Ireland, Galway, Republic of Ireland
- Department of Mineral Resources, Geological Survey of Sweden, 75128 Uppsala, Sweden
| | - Ingo Grunwald
- Department Adhesive Bonding and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials (IFAM), Group BioInspired Materials, 28359 Bremen, Germany
| | - Janek von Byern
- Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Donaueschingenstrasse 13, 1200 Vienna, Austria
| | - Anne Marie Power
- School of Natural Sciences, National University of Ireland, Galway, Republic of Ireland
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Jonker JL, Abram F, Pires E, Varela Coelho A, Grunwald I, Power AM. Adhesive proteins of stalked and acorn barnacles display homology with low sequence similarities. PLoS One 2014; 9:e108902. [PMID: 25295513 PMCID: PMC4189950 DOI: 10.1371/journal.pone.0108902] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2014] [Accepted: 08/27/2014] [Indexed: 11/23/2022] Open
Abstract
Barnacle adhesion underwater is an important phenomenon to understand for the prevention of biofouling and potential biotechnological innovations, yet so far, identifying what makes barnacle glue proteins ‘sticky’ has proved elusive. Examination of a broad range of species within the barnacles may be instructive to identify conserved adhesive domains. We add to extensive information from the acorn barnacles (order Sessilia) by providing the first protein analysis of a stalked barnacle adhesive, Lepas anatifera (order Lepadiformes). It was possible to separate the L. anatifera adhesive into at least 10 protein bands using SDS-PAGE. Intense bands were present at approximately 30, 70, 90 and 110 kilodaltons (kDa). Mass spectrometry for protein identification was followed by de novo sequencing which detected 52 peptides of 7–16 amino acids in length. None of the peptides matched published or unpublished transcriptome sequences, but some amino acid sequence similarity was apparent between L. anatifera and closely-related Dosima fascicularis. Antibodies against two acorn barnacle proteins (ab-cp-52k and ab-cp-68k) showed cross-reactivity in the adhesive glands of L. anatifera. We also analysed the similarity of adhesive proteins across several barnacle taxa, including Pollicipes pollicipes (a stalked barnacle in the order Scalpelliformes). Sequence alignment of published expressed sequence tags clearly indicated that P. pollicipes possesses homologues for the 19 kDa and 100 kDa proteins in acorn barnacles. Homology aside, sequence similarity in amino acid and gene sequences tended to decline as taxonomic distance increased, with minimum similarities of 18–26%, depending on the gene. The results indicate that some adhesive proteins (e.g. 100 kDa) are more conserved within barnacles than others (20 kDa).
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Affiliation(s)
- Jaimie-Leigh Jonker
- School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Florence Abram
- School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
| | - Elisabete Pires
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal
| | - Ana Varela Coelho
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal
| | - Ingo Grunwald
- Department of Adhesive Bonding and Surfaces, Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Bremen, Germany
| | - Anne Marie Power
- School of Natural Sciences, National University of Ireland Galway, Galway, Ireland
- * E-mail:
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22
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Wei Q, Achazi K, Liebe H, Schulz A, Noeske PLM, Grunwald I, Haag R. Mussel-Inspired Dendritic Polymers as Universal Multifunctional Coatings. Angew Chem Int Ed Engl 2014; 53:11650-5. [DOI: 10.1002/anie.201407113] [Citation(s) in RCA: 174] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Indexed: 12/12/2022]
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23
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Zheden V, Klepal W, von Byern J, Bogner FR, Thiel K, Kowalik T, Grunwald I. Biochemical analyses of the cement float of the goose barnacle Dosima fascicularis--a preliminary study. Biofouling 2014; 30:949-963. [PMID: 25237772 DOI: 10.1080/08927014.2014.954557] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The goose barnacle Dosima fascicularis produces an excessive amount of adhesive (cement), which has a double function, being used for attachment to various substrata and also as a float (buoy). This paper focuses on the chemical composition of the cement, which has a water content of 92%. Scanning electron microscopy with EDX was used to measure the organic elements C, O and N in the foam-like cement. Vibrational spectroscopy (FTIR, Raman) provided further information about the overall secondary structure, which tended towards a β-sheet. Disulphide bonds could not be detected by Raman spectroscopy. The cystine, methionine, histidine and tryptophan contents were each below 1% in the cement. Analyses of the cement revealed a protein content of 84% and a total carbohydrate content of 1.5% in the dry cement. The amino acid composition, 1D/2D-PAGE and MS/MS sequence analysis revealed a de novo set of peptides/proteins with low homologies with other proteins such as the barnacle cement proteins, largely with an acidic pI between 3.5 and 6.0. The biochemical composition of the cement of D. fascicularis is similar to that of other barnacles, but it shows interesting variations.
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Affiliation(s)
- Vanessa Zheden
- a University of Vienna, Faculty of Life Sciences, Core Facility Cell Imaging and Ultrastructure Research , Vienna , Austria
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24
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Grunwald I, Struffert T, Ghazzawie H, Möller V, Reith W. Erratum zu: Intrazerebrale Tumoren im Erwachsenenalter. Radiologe 2014. [DOI: 10.1007/s001170200089] [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: 10/27/2022]
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25
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Wei Q, Becherer T, Mutihac RC, Noeske PLM, Paulus F, Haag R, Grunwald I. Multivalent Anchoring and Cross-Linking of Mussel-Inspired Antifouling Surface Coatings. Biomacromolecules 2014; 15:3061-71. [DOI: 10.1021/bm500673u] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Qiang Wei
- Multifunctional
Biomaterials for Medicine, Helmholtz Virtual Institute, Kantstr. 55, 14513 Teltow-Seehof, Germany
- Department
of Chemistry and Biochemistry, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany
| | - Tobias Becherer
- Multifunctional
Biomaterials for Medicine, Helmholtz Virtual Institute, Kantstr. 55, 14513 Teltow-Seehof, Germany
- Department
of Chemistry and Biochemistry, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany
| | - Radu-Cristian Mutihac
- Department
of Chemistry and Biochemistry, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany
| | - Paul-Ludwig Michael Noeske
- Fraunhofer Institute
for Manufacturing Technology and Advanced Materials (FhG IFAM), Wiener Str. 12, 28359 Bremen, Germany
| | - Florian Paulus
- Department
of Chemistry and Biochemistry, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany
| | - Rainer Haag
- Multifunctional
Biomaterials for Medicine, Helmholtz Virtual Institute, Kantstr. 55, 14513 Teltow-Seehof, Germany
- Department
of Chemistry and Biochemistry, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany
| | - Ingo Grunwald
- Fraunhofer Institute
for Manufacturing Technology and Advanced Materials (FhG IFAM), Wiener Str. 12, 28359 Bremen, Germany
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26
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Wei Q, Becherer T, Noeske PLM, Grunwald I, Haag R. A universal approach to crosslinked hierarchical polymer multilayers as stable and highly effective antifouling coatings. Adv Mater 2014; 26:2688-2615. [PMID: 24652687 DOI: 10.1002/adma.201304737] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [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: 09/21/2013] [Revised: 02/10/2014] [Indexed: 06/03/2023]
Abstract
Material-independent and bioinert hierarchical polymer multilayer coatings are presented. Chemically active catecholic hyperbranched polyglycerols (hPGs) form a foundation layer on a versatile surface via multivalent anchoring and crosslinking, the activity of which is shielded by the bioinert catecholic hPGs. Mono-catecholic hPGs finally terminate all of the free catechols to build a flexible bioinert top layer. These coatings perfectly prevent protein and cell adhesion.
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Affiliation(s)
- Qiang Wei
- Department of Chemistry and Biochemistry, Freie Universität Berlin, Takustr. 3, 14195, Berlin, Germany; Helmholtz Virtual Institute, Multifunctional Biomaterials for Medicine, Kantstraße 55, 14513, Teltow-Seehof, Germany
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Kreider A, Sell S, Kowalik T, Hartwig A, Grunwald I. Influence of immobilization protocol on the structure and function of surface bound proteins. Colloids Surf B Biointerfaces 2014; 116:378-82. [DOI: 10.1016/j.colsurfb.2013.07.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Revised: 07/08/2013] [Accepted: 07/08/2013] [Indexed: 12/16/2022]
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28
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Janardhan V, Carlson L, Gianatasio R, Chen S, Bhuva P, Murray M, Vijayappa M, Hansen P, Cheung R, Leung T, Grunwald I, Hernandez H, Barraza L, Buell H, Kuo S, Bose A, Sit S. O-007 Natural History of Acute Ischaemic Stroke from Large Vessel Occlusion Demonstrates Efficacy of Mechanical Thrombectomy: Preliminary Results of the Penumbra FIRST Study. J Neurointerv Surg 2013. [DOI: 10.1136/neurintsurg-2013-010870.7] [Citation(s) in RCA: 2] [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: 11/03/2022]
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Gaede-Koehler A, Kreider A, Canfield P, Kleemeier M, Grunwald I. Direct Measurement of the Thermal Hysteresis of Antifreeze Proteins (AFPs) Using Sonocrystallization. Anal Chem 2012; 84:10229-35. [DOI: 10.1021/ac301946w] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrea Gaede-Koehler
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials (FhG IFAM), Wiener
Strasse 12, 28359 Bremen, Germany
| | - Alexej Kreider
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials (FhG IFAM), Wiener
Strasse 12, 28359 Bremen, Germany
| | - Peter Canfield
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials (FhG IFAM), Wiener
Strasse 12, 28359 Bremen, Germany
| | - Malte Kleemeier
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials (FhG IFAM), Wiener
Strasse 12, 28359 Bremen, Germany
| | - Ingo Grunwald
- Fraunhofer Institute for Manufacturing Technology and Advanced Materials (FhG IFAM), Wiener
Strasse 12, 28359 Bremen, Germany
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30
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Zheden V, Von Byern J, Kerbl A, Leisch N, Staedler Y, Grunwald I, Power AM, Klepal W. Morphology of the cement apparatus and the cement of the buoy barnacle Dosima fascicularis (Crustacea, Cirripedia, Thoracica, Lepadidae). Biol Bull 2012; 223:192-204. [PMID: 23111131 DOI: 10.1086/bblv223n2p192] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Barnacles produce a proteinaceous adhesive called cement to attach permanently to rocks or to other hard substrata. The stalked barnacle Dosima fascicularis is of special interest as it produces a large amount of foam-like cement that can be used as a float. The morphology of the cement apparatus and of the polymerized cement of this species is almost unknown. The current study aims at filling these gaps in our knowledge using light and electron microscopy as well as x-ray microtomography. The shape of the cement gland cells changes from round to ovoid during barnacle development. The cytoplasm of the gland cells, unlike that of some other barnacles, does not have distinct secretory and storage regions. The cement canals, which transport the cement from the gland cells to the base of the stalk, end at different positions in juvenile and mature animals. With increasing size of the cement float, the exit of the cement canals shift from the centrally positioned attachment disk of the vestigial antennules to more lateral positions on the stalk. The bubbles enclosed in the foam-like float are most likely filled with CO(2) that diffuses from the hemolymph into the cement canal system and from there into the cement.
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Affiliation(s)
- Vanessa Zheden
- Faculty of Life Sciences, Core Facility of Cell Imaging and Ultrastructure Research, University of Vienna, Austria.
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31
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Kostopoulos P, Walter S, Haass A, Papanagiotou P, Roth C, Yilmaz U, Körner H, Alexandrou M, Viera J, Dabew E, Ziegler K, Schmidt K, Kubulus D, Grunwald I, Schlechtriemen T, Liu Y, Volk T, Reith W, Fassbender K. Mobile stroke unit for diagnosis-based triage of persons with suspected stroke. Neurology 2012; 78:1849-52. [PMID: 22592363 DOI: 10.1212/wnl.0b013e318258f773] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND In this feasibility study, we tested whether prehospital diagnostic stroke workup enables rational decision-making regarding treatment and the target hospital in persons with suspected stroke. METHODS A mobile stroke unit that delivers imaging (including multimodal brain imaging with CT angiography and CT perfusion), point-of-care-laboratory analysis, and neurologic expertise directly at the emergency site was analyzed for its use in prehospital diagnosis-based triage of suspected stroke patients. RESULTS We present 4 complementary cases with suspected stroke who underwent prehospital diagnostic workup that enabled direct diagnosis-based treatment decisions and reliable triage regarding the most appropriate medical facility for that individual, e.g., a primary hospital vs specialized centers of a tertiary hospital. CONCLUSIONS This preliminary report demonstrates the feasibility of prehospital diagnostic stroke workup for immediate etiology-specific decision-making regarding the necessary time-sensitive stroke treatment and the most appropriate target hospital.
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Affiliation(s)
- P Kostopoulos
- Departments of Neurology, Saarland University Hospital, Saarland, Germany
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32
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von Byern J, Wani R, Schwaha T, Grunwald I, Cyran N. Old and sticky-adhesive mechanisms in the living fossil Nautilus pompilius (Mollusca, Cephalopoda). ZOOLOGY 2012; 115:1-11. [PMID: 22221553 PMCID: PMC3311398 DOI: 10.1016/j.zool.2011.08.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Revised: 08/10/2011] [Accepted: 08/11/2011] [Indexed: 11/26/2022]
Abstract
Nautiloidea is the oldest group within the cephalopoda, and modern Nautilus differs much in its outer morphology from all other recent species; its external shell and pinhole camera eye are the most prominent distinguishing characters. A further unique feature of Nautilus within the cephalopods is the lack of suckers or hooks on the tentacles. Instead, the animals use adhesive structures present on the digital tentacles. Earlier studies focused on the general tentacle morphology and put little attention on the adhesive gland system. Our results show that the epithelial parts on the oral adhesive ridge contain three secretory cell types (columnar, goblet, and cell type 1) that differ in shape and granule size. In the non-adhesive aboral epithelium, two glandular cell types (cell types 2 and 3) are present; these were not mentioned in any earlier study and differ from the cells in the adhesive area. The secretory material of all glandular cell types consists mainly of neutral mucopolysaccharide units, whereas one cell type in the non-adhesive epithelium also reacts positive for acidic mucopolysaccharides. The present data indicate that the glue in Nautilus consists mainly of neutral mucopolysaccharides. The glue seems to be a viscous carbohydrate gel, as known from another cephalopod species. De-attachment is apparently effectuated mechanically, i.e., by muscle contraction of the adhesive ridges and tentacle retraction.
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Affiliation(s)
- Janek von Byern
- Core Facility Cell Imaging and Ultrastructural Research, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria.
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33
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von Byern J, Scott R, Griffiths C, Micossi A, Grunwald I, Cyran N. Characterization of the adhesive areas in Sepia tuberculata (Mollusca, Cephalopoda). J Morphol 2011; 272:1245-58. [PMID: 21688295 DOI: 10.1002/jmor.10980] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2010] [Revised: 03/30/2011] [Accepted: 04/07/2011] [Indexed: 11/11/2022]
Abstract
Adhesion in cephalopods is either mechanical, involving a reduced-pressure system of the arm and tentacle suckers, or is chemically mediated by special adhesive gland structures (as proposed for Euprymna, Idiosepius, and Nautilus). Four species of Sepia (S. typica, S. papillata, S. pulchra, and S. tuberculata) possess grooved structures on the ventral mantle surface and on the fourth arm pair, which are used to attach mechanically to the substratum. Because these areas are often partly covered with sand or debris, it has been hypothesized that chemical substances were involved in this attachment process. This study provides a histochemical and ultrastructural description of the glandular epithelium in the adhesive area of Sepia tuberculata. Two specific glandular cells (Type 1 and Type 2) are present in the epithelium, which differ clearly in their granule size and cellular structure. The aggregation of both cell types and their simultaneous secretion suggest that the secretions of both cell types work synergistically providing a two-component adhesive system which supports the primarily mechanical sucker adhesion by making the arm surface sticky.
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Affiliation(s)
- Janek von Byern
- University of Vienna, Faculty of Life Sciences, Core Facility Cell Imaging and Ultrastructural Research, Vienna, Austria.
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34
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Geppert M, Hohnholt MC, Thiel K, Nürnberger S, Grunwald I, Rezwan K, Dringen R. Uptake of dimercaptosuccinate-coated magnetic iron oxide nanoparticles by cultured brain astrocytes. Nanotechnology 2011; 22:145101. [PMID: 21346306 DOI: 10.1088/0957-4484/22/14/145101] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Magnetic iron oxide nanoparticles (Fe-NP) are currently considered for various diagnostic and therapeutic applications in the brain. However, little is known on the accumulation and biocompatibility of such particles in brain cells. We have synthesized and characterized dimercaptosuccinic acid (DMSA) coated Fe-NP and have investigated their uptake by cultured brain astrocytes. DMSA-coated Fe-NP that were dispersed in physiological medium had an average hydrodynamic diameter of about 60 nm. Incubation of cultured astrocytes with these Fe-NP caused a time- and concentration-dependent accumulation of cellular iron, but did not lead within 6 h to any cell toxicity. After 4 h of incubation with 100-4000 µM iron supplied as Fe-NP, the cellular iron content reached levels between 200 and 2000 nmol mg⁻¹ protein. The cellular iron content after exposure of astrocytes to Fe-NP at 4 °C was drastically lowered compared to cells that had been incubated at 37 °C. Electron microscopy revealed the presence of Fe-NP-containing vesicles in cells that were incubated with Fe-NP at 37 °C, but not in cells exposed to the nanoparticles at 4 °C. These data demonstrate that cultured astrocytes efficiently take up DMSA-coated Fe-NP in a process that appears to be saturable and strongly depends on the incubation temperature.
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Affiliation(s)
- Mark Geppert
- Center for Biomolecular Interactions Bremen, University of Bremen, PO Box 330440, D-28334 Bremen, Germany
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35
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Weinhart M, Grunwald I, Wyszogrodzka M, Gaetjen L, Hartwig A, Haag R. Linear poly(methyl glycerol) and linear polyglycerol as potent protein and cell resistant alternatives to poly(ethylene glycol). Chem Asian J 2010; 5:1992-2000. [PMID: 20602410 DOI: 10.1002/asia.201000127] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The nonspecific interaction of proteins with surfaces in contact with biofluids leads to adverse problems and is prevented by a biocompatible surface coating. The current benchmark material among such coatings is poly(ethylene glycol) (PEG). Herein, we report on the synthesis of linear polyglycerol derivatives as promising alternatives to PEG. Therefore, gold surfaces as a model system are functionalized with a self-assembled monolayer (SAM) by a two-step anhydride coupling and a direct thiol immobilization of linear poly(methyl glycerol) and polyglycerol. Surface plasmon resonance (SPR) spectroscopy reveals both types of functionalized surfaces to be as resistant as PEG towards the adsorption of the test proteins fibrinogen, pepsin, albumin, and lysozyme. Moreover, linear polyglycerols adsorb even less proteins from human plasma than a PEG-modified surface. Additional cell adhesion experiments on linear poly(methyl glycerol) and polyglycerol-modified surfaces show comparable cell resistance as for a PEG-modified surface. Also, in the case of long-term stability, high cell resistance is observed for all samples in medium. Additional in vitro cell-toxicity tests add to the argument that linear poly(methyl glycerol) and polyglycerol are strong candidates for promising alternatives to PEG, which can easily be modified for biocompatible functionalization of other surfaces.
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Affiliation(s)
- Marie Weinhart
- Department of Chemistry and Biochemistry, Freie Universitaet Berlin, Takustr. 3, 14195 Berlin, Germany
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36
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Frei D, Bellon R, Kulcsar Z, Bonvin C, Rufenacht D, Alfke K, Stingele R, Jansen O, Madison M, Struffert T, Dorfler A, Grunwald I, Reith W, Haass A, Hsu D, Tarr R. O-021 Significant improvement in patient functional outcome after revascularization of the middle cerebral artery by mechanical thrombectomy. J Neurointerv Surg 2010. [DOI: 10.1136/jnis.2010.003244.21] [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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37
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Grunwald I, Groth E, Wirth I, Schumacher J, Maiwald M, Zoellmer V, Busse M. Surface biofunctionalization and production of miniaturized sensor structures using aerosol printing technologies. Biofabrication 2010; 2:014106. [DOI: 10.1088/1758-5082/2/1/014106] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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38
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Yeter R, Grunwald I, Hay G, Lehmkuhl H, Hetzer R, Knosalla C. 15: Predictive Value of Bedside-Tests in the Assessment of Potential Donor Hearts. J Heart Lung Transplant 2010. [DOI: 10.1016/j.healun.2009.11.022] [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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Yeter R, Hübler M, Pasic M, Grunwald I, Youssef B, Dandel M, Lehmkuhl H, Hetzer R, Knosalla C. Initial single center experience with the Organ Care System for heart preservation. Thorac Cardiovasc Surg 2010. [DOI: 10.1055/s-0029-1246926] [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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40
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Tarr R, Hsu D, Kulcsar Z, Bonvin C, Rufenacht D, Alfke K, Stingele R, Jansen O, Frei D, Bellon R, Madison M, Struffert T, Dorfler A, Grunwald I, Reith W, Haass A. 028 Revascularization of large vessel occlusion by the Penumbra System in acute ischemic stroke contributes to good functional outcome. J Neurointerv Surg 2009. [DOI: 10.1136/jnis.2009.001016b] [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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41
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Geppert M, Hohnholt M, Gaetjen L, Grunwald I, Bäumer M, Dringen R. Accumulation of Iron Oxide Nanoparticles by Cultured Brain Astrocytes. J Biomed Nanotechnol 2009; 5:285-93. [DOI: 10.1166/jbn.2009.1033] [Citation(s) in RCA: 46] [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: 11/23/2022]
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42
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Grunwald I, Rischka K, Kast SM, Scheibel T, Bargel H. Mimicking biopolymers on a molecular scale: nano(bio)technology based on engineered proteins. Philos Trans A Math Phys Eng Sci 2009; 367:1727-1747. [PMID: 19376768 DOI: 10.1098/rsta.2009.0012] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Proteins are ubiquitous biopolymers that adopt distinct three-dimensional structures and fulfil a multitude of elementary functions in organisms. Recent systematic studies in molecular biology and biotechnology have improved the understanding of basic functional and architectural principles of proteins, making them attractive candidates as concept generators for technological development in material science, particularly in biomedicine and nano(bio)technology. This paper highlights the potential of molecular biomimetics in mimicking high-performance proteins and provides concepts for applications in four case studies, i.e. spider silk, antifreeze proteins, blue mussel adhesive proteins and viral ion channels.
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Affiliation(s)
- Ingo Grunwald
- Department of Adhesive Bonding Technology and Surfaces, Fraunhofer Institute for Manufacturing Technology and Applied Materials Research (IFAM)28359 Bremen, Germany
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Krippner-Heidenreich A, Grunwald I, Zimmermann G, Kühnle M, Gerspach J, Sterns T, Shnyder SD, Gill JH, Männel DN, Pfizenmaier K, Scheurich P. Single-chain TNF, a TNF derivative with enhanced stability and antitumoral activity. J Immunol 2008; 180:8176-83. [PMID: 18523283 DOI: 10.4049/jimmunol.180.12.8176] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The inflammatory and proapoptotic cytokine TNF possesses a compelling potential as an antitumoral therapeutic agent. Possible target cells include the malignant cells themselves, the tumor vasculature, or the immune system. As the clinical use of TNF is limited by systemic toxicity, targeting strategies using TNF-based fusion proteins are currently used. A major obstacle, however, is that homotrimeric TNF ligands are prone to activity loss due to dissociation into their monomers. In this study, we report the construction of single-chain TNF molecule, a TNF mutant consisting of three TNF monomers fused by short peptide linkers. In comparison to wild-type TNF, single-chain TNF was found to possess increased stability in vitro and in vivo, displayed reduced systemic toxicity yet slightly enhanced antitumoral activity in mouse models. Creation of single-chain variants is a new approach for improvement of functional activity of therapeutics based on TNF family ligands.
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Abstract
Cavernomas of the CNS may involve brain parenchyma as well as the spinal cord and belong to those cerebrovascular malformations that have no arteriovenous shunt and thus are generally angiographically occult. Contrary to computed tomography (CT), which is generally suited to reveal calcifications or acute bleeding, magnetic resonance imaging (MRI) enables detection of even small cavernomas. A frequently associated venous anomaly is helpful for correct diagnosis.
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Affiliation(s)
- F Ahlhelm
- Klinik für Diagnostische und Interventionelle Neuroradiologie der Radiologischen Klinik, Universitätsklinikum des Saarlandes, 66421, Homburg/Saar, Germany.
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45
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Abstract
Because of the complex anatomy, examination of the sella turcica and hypophysis needs a dedicated MR sequence protocol. Not every sellar lesion is a pituitary adenoma. Thus, this review article summarizes the most frequently encountered intra-, supra-, and parasellar tumors and lesions. Differential diagnoses comprise besides adenoma among others craniopharyngioma, meningioma, glioma, germinoma, hamartoma, aneurysm, trigeminal schwannoma, pituitary carcinoma, chordoma, metastasis, infection, and empty sella. Characteristic imaging findings are presented and correlated to micro- and macro-pathology.
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Affiliation(s)
- M-A Weber
- Abteilung Radiologie, Deutsches Krebsforschungszentrum, Heidelberg.
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46
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Abstract
Magnetic resonance imaging is a routine diagnostic measure for a suspected intracerebral mass. Computed tomography is usually also indicated. Further diagnostic procedures as well as the interpretation of the findings vary depending on the tumor location. This contribution discusses the symptoms and diagnostics for supratentorial tumors separated in relation to their intra- or extracranial location. Supratentorial tumors include astrocytoma, differentiated by their circumscribed and diffuse growth, ganglioglioma, ependyoma, neurocytoma, primitive neuroectodermal tumors (PNET), oligodendroglioma, dysem-bryoplastic neuroepithelial tumors (DNET), meningoangiomatosis, pineal tumors, hamatoma, lymphoma, craniopharyngeoma and metastases. The supratentorial extracranial tumors include the choroid plexus, colloid cysts, meningeoma, infantile myofibromatosis and lipoma. The most common sub-forms, especially of astrocytoma, will also be presented.
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Affiliation(s)
- I Grunwald
- Klinik für Diagnostische und Interventionelle Neuroradiologie, Universitätsklinikum des Saarlandes, Homburg
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47
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Abstract
Regardless of the compartment involved, imaging of spinal infections and other spinal inflammatory diseases must be performed by magnetic resonance imaging (MRI). This allows early detection of changes in disk space or vertebral bodies. Associated paraspinal and epidural masses are depicted. However, in spinal cord inflammation MRI has a very limited specificity and cannot usually differentiate between the wide array of possible causes of intramedullary lesions. This article covers a spectrum of inflammatory lesions of the spinal cord.
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Affiliation(s)
- I Grunwald
- Klinik für Diagnostische und Interventionelle Neuroradiologie, Universitätsklinikum des Saarlandes, 66421, Homburg/Saar, Deutschland.
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48
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Grunwald I, Heinig I, Thole HH, Neumann D, Kahmann U, Kloppstech K, Gau AE. Purification and characterisation of a jacalin-related, coleoptile specific lectin from Hordeum vulgare. Planta 2007; 226:225-34. [PMID: 17245569 DOI: 10.1007/s00425-006-0467-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2006] [Accepted: 12/15/2006] [Indexed: 05/13/2023]
Abstract
A plant lectin was isolated from barley (Hordeum vulgare) coleoptiles using acidic extraction and different chromatographic methods. Sequencing of more than 50% of the protein sequence by Edman degradation confirmed a full-length cDNA clone. The subsequently identified open reading frame encodes for a 15 kDa protein which could be found in the soluble fraction of barley coleoptiles. This protein exhibited specificity towards mannose sugar and is therefore, accordingly named as Horcolin (Hordeum vulgare coleoptile lectin). Database searches performed with the Horcolin protein sequence revealed a sequence and structure homology to the lectin family of jacalin-related lectins. Together with its affinity towards mannose, Horcolin is now identified as a new member of the mannose specific subgroup of jacalin-related lectins in monocot species. Horcolin shares a high amino acid homology to the highly light-inducible protein HL#2 and, in addition to two methyl jasmonic acid-inducible proteins of 32.6 and 32.7 kDa where the jasmonic acid-inducible proteins are examples of bitopic chimerolectins containing a dirigent and jacalin-related domain. Immunoblot analysis with a cross-reactive anti-HL#2 antibody in combination with Northern blot analysis of the Horcolin cDNA revealed tissue specific expression of Horcolin in the coleoptiles. The function of Horcolin is discussed in the context of its particular expression in coleoptiles and is then compared to other lectins, which apparently share a related response to biotic or abiotic stress factors.
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Affiliation(s)
- Ingo Grunwald
- Fraunhofer IFAM, Adhesive Bonding Technology and Surfaces, Wiener Str. 12, 28359, Bremen, Germany
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49
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Ahlhelm FJ, Naumann N, Haass A, Grunwald I, Schulte-Altedorneburg G, Fassbender K, Reith W. [Stroke]. Radiologe 2007; 46:905-17; quiz 918. [PMID: 17009049 DOI: 10.1007/s00117-006-1408-1] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Today stroke represents a major medical and political problem in Western industrial nations. High demands need to be placed on the initial diagnostic work-up and therapeutic treatment to ensure that the patients benefit from the recent advancements achieved in diagnostic and therapeutic fields. According to the motto "time is brain" the clinical examination and imaging have to be performed within 60 min ("door to needle time") so that potential patients can be quickly treated with systemic or intra-arterial lysis. However, it should be taken into consideration that the selection of diagnostic imaging facilities depends on several factors such as infrastructure, the time remaining in the diagnostic window, and the severity of the clinical symptoms.
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Affiliation(s)
- F J Ahlhelm
- Klinik für Diagnostische and Interventionelle Neuroradiologie, Universitätsklinikum des Saarlandes, 66421 , Homburg/Saar.
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50
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Grunwald I, Roth C, Politi M, Ahlhelm F, Backens M, Reith W. [Imaging of spinal tumors]. Radiologe 2006; 46:1044-50. [PMID: 17119894 DOI: 10.1007/s00117-006-1441-0] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Spinal tumors are often categorized into extradural, intradural extramedullary, or intramedullary. Although this classification represents somewhat of an overgeneralization as a lesion may reside in two compartments, it still helps to characterize spinal tumors. In the intradural, extramedullary space, primary tumors, such as neurofibroma and meningioma, are relatively common. Secondary tumors or leptomeningeal enhancement also occur. In the intramedullary space, primary tumors are far more common than secondary tumors or metastases.
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Affiliation(s)
- I Grunwald
- Klinik für Diagnostische und Interventionelle Neuroradiologie, Universitätsklinikum des Saarlandes, 66421, Homburg-Saar, Deutschland.
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