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Burgstahler C, Plank C, Niess AM, Schobersberger W, Niebauer J, Scharhag J. Effects of the corona pandemic on competitive sports – an online survey amongst 2981 German and Austrian elite athletes. Dtsch Z Sportmed 2023. [DOI: 10.5960/dzsm.2022.552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/09/2023]
Abstract
Background: The impact of the corona pandemic on competitive sports has not yet been studied in a larger group of athletes. Methods: Using an online questionnaire, junior and adult elite athletes from Germany and Austria were asked about their infection status, potential symptoms of COVID-19, and the impact of the pandemic on their athletic activity. Results: Between April 21, 2020 and February 16, 2021, a total of 2981 questionnaires were recorded (50.3% female, 25.7% professional athletes, 37.9% national team members). 78 athletes (2.6%) reported a positive PCR test result for SARS-CoV-2. In addition, 67 (2.3%) athletes reported that they had experienced the disease but were self-diagnosed. In 19 athletes (0.6%), infection was suspected by a physician but without testing. 841 (28.2%) athletes stated that they were in quarantine at least once. At least one symptom that might be associated with COVID-19 was observed in 38.7% of all athletes. Cardiac symptoms were reported significantly more often in PCR-positive athletes than in the group of athletes without confirmed infection or no infection. 15 athletes (0.5%) were admitted to hospital due to COVID-19, 8 of them were hospitalized for more than 1 week. Conclusion: The corona pandemic has a massive impact on competitive sports. In addition to indirect consequences due to quarantine measures or cancellation of competitions, infections with SARS-CoV-2 occurred in a significant proportion of athletes. Severe courses with hospitalization were also recorded among competitive athletes.
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Bundscherer A, Malsy M, Gebhardt K, Metterlein T, Plank C, Wiese CH, Gruber M, Graf BM. Effects of ropivacaine, bupivacaine and sufentanil in colon and pancreatic cancer cells in vitro. Pharmacol Res 2015; 95-96:126-31. [PMID: 25839130 DOI: 10.1016/j.phrs.2015.03.017] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 03/24/2015] [Accepted: 03/24/2015] [Indexed: 01/06/2023]
Abstract
The perioperative period is supposed to be a vulnerable period for cancer progression. Results of clinical studies indicate that the use of regional anesthesia can influence and improve oncological outcome of cancer patients. Uncontrolled cell proliferation and resistance to apoptotic cell death are important characteristics of solid tumors. The aim of this study was to investigate the effects of the clinically used local anesthetics ropivacaine or bupivacaine and the opioid analgesic sufentanil on cell proliferation, cell cycle distribution and apoptosis of colon (HT 29 and SW 480) and pancreatic (PaTu 8988t and PANC 1) cancer cell lines in vitro. Cell proliferation was measured by Cell Proliferation ELISA BrdU Assay. Apoptosis was analyzed by annexin V staining and cell cycle distribution was detected by flow cytometry. Ropivacaine, bupivacaine and sufentanil did not change apoptosis rate and cell cycle distribution in clinically concentration. Only high concentrations of ropivacaine or bupivacaine revealed antiproliferative potency. Protective effects of epidural anesthesia observed in clinical studies seem not to be based on direct effects of these drugs on cancer cells.
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Affiliation(s)
- A Bundscherer
- Department of Anesthesiology, University of Regensburg, Germany.
| | - M Malsy
- Department of Anesthesiology, University of Regensburg, Germany
| | - K Gebhardt
- Department of Anesthesiology, University of Regensburg, Germany
| | - T Metterlein
- Department of Anesthesiology, University of Regensburg, Germany
| | - C Plank
- Department of Anesthesiology, University of Regensburg, Germany
| | - C H Wiese
- Department of Anesthesiology, University of Regensburg, Germany
| | - M Gruber
- Department of Anesthesiology, University of Regensburg, Germany
| | - B M Graf
- Department of Anesthesiology, University of Regensburg, Germany
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Ottersbach A, Eberbeck D, Brügmann T, Gleich B, Plank C, Sasse P, Pfeifer A, Welz A, Fleischmann B, Röll W. Site-specific Positioning of Magnetic Nanoparticle (MNP) Loaded Progenitors Improves Cell Engraftment, Long Term Myocardial Function and Protects from Ventricular Tachycardia upon Myocardial Infarction. Thorac Cardiovasc Surg 2015. [DOI: 10.1055/s-0035-1544333] [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: 10/24/2022]
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Ottersbach A, Zimmermann K, Mykhaylyk O, Gleich B, Plank C, Bloch W, Pfeifer A, Welz A, Fleischmann B, Röll W. Site-specific positioning of magnetic nanoparticle (MNP) loaded progenitors improves survival of the grafted cells and long-term myocardial function upon myocardial infarction. Thorac Cardiovasc Surg 2014. [DOI: 10.1055/s-0034-1367202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Ottersbach A, Kilgus C, Heidsieck A, Zimmermann K, Mykhaylyk O, Gleich B, Plank C, Pfeifer A, Sasse P, Fleischmann BK, Welz A, Roell W. Site specific positioning of magnetic nanoparticle (MNP) loaded cells improves cell homing and cardiac function. Thorac Cardiovasc Surg 2013. [DOI: 10.1055/s-0032-1332326] [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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Schwabe P, Greiner S, Ganzert R, Eberhart J, Dähn K, Stemberger A, Plank C, Schmidmaier G, Wildemann B. Effect of a novel nonviral gene delivery of BMP-2 on bone healing. ScientificWorldJournal 2012; 2012:560142. [PMID: 23213289 PMCID: PMC3504401 DOI: 10.1100/2012/560142] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [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: 08/02/2012] [Accepted: 09/30/2012] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Gene therapeutic drug delivery approaches have been introduced to improve the efficiency of growth factors at the site of interest. This study investigated the efficacy and safety of a new nonviral copolymer-protected gene vector (COPROG) for the stimulation of bone healing. METHODS In vitro, rat osteoblasts were transfected with COPROG + luciferase plasmid or COPROG + hBMP-2 plasmid. In vivo, rat tibial fractures were intramedullary stabilized with uncoated versus COPROG+hBMP-2-plasmid-coated titanium K-wires. The tibiae were prepared for biomechanical and histological analyses at days 28 and 42 and for transfection/safety study at days 2, 4, 7, 28, and 42. RESULTS In vitro results showed luciferase expression until day 21, and hBMP-2-protein was measured from day 2 - day 10. In vivo, the local application of hBMP-2-plasmid showed a significantly higher maximum load after 42 days compared to that in the control. The histomorphometric analysis revealed a significantly less mineralized periosteal callus area in the BMP-2 group compared to the control at day 28. The rt-PCR showed no systemic biodistribution of luciferase RNA. CONCLUSION A positive effect on fracture healing by nonviral BMP-2 plasmid application from COPROG-coated implants could be shown in this study; however, the effect of the vector may be improved with higher plasmid concentrations. Transfection showed no biodistribution to distant organs and was considered to be safe.
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Affiliation(s)
- P Schwabe
- Center for Musculoskeletal Surgery and Julius Wolff Institute, Charité-University Medicine Berlin, Campus Virchow, Augustenburger Platz 1, 13353 Berlin, Germany.
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Reckhenrich AK, Koch C, Egaña JT, Plank C, Plank C. The use of non-viral gene vectors for bioactive poly-(D,L-lactide) implant surfaces in bone tissue engineering. Eur Cell Mater 2012; 23:441-8. [PMID: 22736203 DOI: 10.22203/ecm.v023a34] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
The application of scaffolds in bone tissue engineering often comes along with side effects such as poor integrity, low regeneration rates of bone tissue with inadequate functionality, and, in case of non-degradable implants, the necessity of a second removal surgery after therapy. In this study, we coated a bioresorbable FDA-approved poly-(ε-caprolactone)-scaffold for bone regeneration with a poly-(D,L-lactide) layer containing copolymer-protected gene vectors to locally provide bone morphogenetic protein-2 (BMP-2). Results show that the presence of such gene vectors did not affect the distribution and attachment of seeded cells on gene-activated surfaces. BMP-2 was released into cell culture supernatants and furthermore detected in homogenised scaffolds. Increased amounts of osteoblastic markers, such as osteocalcin, osteopontin and the activity of alkaline phosphatase, in gene-activated scaffolds in vitro suggest a transdifferentiation of myoblastic C2C12 cells into the osteoblastic phenotype. With this study we present a new technology to bioactivate implant surfaces with non-viral gene vectors. This tool allows the stimulation of tissue regeneration by a local release of therapeutic proteins in vivo.
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Affiliation(s)
- Ann K Reckhenrich
- Institute of Experimental Oncology, Technische Universität München, Munich, Germany.
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Braren R, Mykhaylyk O, Almstätter I, Settles M, Kosanke Y, Plank C, Ebert O, Rummeny E, Altomonte J. Magnetisches Targeting von onkolytischem Vesikulärem Stomatitis Virus (VSV) in einem hepatozellulärem Karzinom (HCC) Modell der Ratte. ROFO-FORTSCHR RONTG 2012. [DOI: 10.1055/s-0032-1311063] [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: 10/28/2022]
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Lammer J, Schoder M, Funovics M, Wolf F, Plank C, Matzek W, Loewe C. Ruptiertes BAA - Notfall EVAR. ROFO-FORTSCHR RONTG 2012. [DOI: 10.1055/s-0032-1310618] [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: 10/28/2022]
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Mykhaylyk O, Plank C. Magnetische Nanopartikel für Gentransfer. BIOMED ENG-BIOMED TE 2012. [DOI: 10.1515/bmt-2012-4521] [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: 11/15/2022]
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Lammer J, Funovics M, Schoder M, Plank C, Wolf F, Kölblinger C, Matzek W. DEB-TACE (Drug-eluting Bead TACE). ROFO-FORTSCHR RONTG 2011. [DOI: 10.1055/s-0031-1278983] [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]
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Alejandre Alcazar MA, Boehler E, Amann K, Klaffenbach D, Hartner A, Allabauer I, Wagner L, von Horsten S, Plank C, Dotsch J. Persistent changes within the intrinsic kidney-associated NPY system and tubular function by litter size reduction. Nephrol Dial Transplant 2011; 26:2453-65. [DOI: 10.1093/ndt/gfq825] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Rückert F, Benz K, Plank C, Dittrich K. Einfluss der Glucocorticoidbehandlung auf den Verlauf der Membranoproliferativen Glomerulonephritis (MPGN) bei Kindern. Klin Padiatr 2011. [DOI: 10.1055/s-0031-1273838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Lanczak J, Plank C, Rascher W, Schmidt W, Kläver K, Amann K, Dittrich K. Fanconi-Syndrom bei interstitieller Nephritis durch HHV6-Infektion? Klin Padiatr 2011. [DOI: 10.1055/s-0031-1273882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Galiano M, Plank C, Amann K, Dötsch J, Rascher W, Dittrich K. Starker Gewichtsverlust und Hypokaliämie als Zeichen der humoralen Transplantatabstoßung. Klin Padiatr 2011. [DOI: 10.1055/s-0031-1273862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Abstract
BACKGROUND Intrauterine growth restriction seems to be a risk factor for an aggravated course of secondary renal diseases in children. Catch-up growth after birth may play a critical role. We tested if there is an association between an aggravated course of nephritis in Henoch-Schönlein Purpura (PSHN) and low birth weight or early weight gain during infancy. PATIENTS We retrospectively analysed the clinical course of 34 children with PSHN. METHODS Patients were sorted according their birth weight standard deviation score (SDS) in tertiles. Early weight gain was defined as gain of weight standard deviation score >0.67 between birth and 2 years of age. RESULTS Patients with higher birth weight needed Cyclophosphamide in a higher rate than low birth weight children. In the high weight gain group (SDS gain >0.67) 9 of the 11 patients compared to 7 of 22 patients in the low weight gain group (SDS gain <0.67) presented with arterial hypertension during the initial manifestation of PSH nephritis (p=0.01). Median systolic blood pressure SDS in the high weight gain group was 1.54 (-1.39-4.71) versus 0.29 (0.52-4.05) in the low weight gain group (p=0.008). Nevertheless, other clinical parameters during first manifestation and follow-up were not relevantly different. CONCLUSION In contrast to the data of children with idiopathic nephrotic syndrome or IgA nephropathy, this study does neither provide evidence for an association between low birth weight nor early weight gain and the later course of PSHN. Interestingly, early weight gain was associated with a higher systolic blood pressure during the initial manifestation of PSHN.
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Affiliation(s)
- C Plank
- Department of Pediatrics, University Hospital Erlangen, Germany
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Ostreicher I, Almeida JR, Campean V, Rauh M, Plank C, Amann K, Dotsch J. Changes in 11 -hydroxysteroid dehydrogenase type 2 expression in a low-protein rat model of intrauterine growth restriction. Nephrol Dial Transplant 2010; 25:3195-203. [DOI: 10.1093/ndt/gfq354] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Richter M, Plank C, Lang T, Behrens R, Carbon RT, Dötsch J, Köhler H. [Benefits and risks of tube feeding via gastrostoma in infants and children with peritoneal dialysis]. Z Gastroenterol 2010; 48:673-7. [PMID: 20517804 DOI: 10.1055/s-0028-1109931] [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] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND Nutrition of children with end-stage renal disease and peritoneal dialysis (PD) is often difficult. Tube feeding via a gastrostoma is discussed controversially, and some authors consider this as a contraindication because of the risk of peritonitis. METHODS In our centre 16 infants and children with end-stage renal disease were treated with PD and tube feeding over a gastrostoma in the last 12 years. The patients showed dystrophy (mean BMI -1.73 SDS) and were too small (mean body length -4.56 SDS). Seven of them (median age 11 months) received a gastrostoma before insertion of a Tenkhoff-catheter and start of PD. Nine children (median age 5 months) had PD primarily before insertion of the gastrostoma and start of tube feeding. RESULTS Patients with start of PD while a gastrostoma was already inserted had 15 events with peritonitis in the observation time of 91 months (1.98 per patient year). Patients with primary start of PD had 12 events with peritonitis in a total time of 43 month (3.34 per patient year), after insertion while PD was already running the number of events fell significantly to 25 peritonitis events in a total of 271 months (1.11 per patient year, p < 0.01). The children had a benefit from tube feeding via a gastrostoma in regard of body weight (BMI + 1.61 SDS, p < 0.01) as well as growth (body height + 2.29 SDS, p < 0.05). CONCLUSION Tube feeding via a gastrostoma is a good and safe option for alimentation, even under peritoneal dialysis. A decrease of PD-associated peritonitis under tube feeding was observed while physical development was positively influenced.
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Affiliation(s)
- M Richter
- Kinder- und Jugendklinik, Universitätsklinikum, Erlangen
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Alejandre Alcázar MA, Lendzian L, Hartner A, Plank C, Dötsch J. Prädisposition für Atemwegserkrankung nach intrauteriner Wachstumsrestriktion. Klin Padiatr 2010. [DOI: 10.1055/s-0030-1251044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Galiano M, Plank C, Dittrich K, Beck B, Hoppe B, Dötsch J. Terminales Nierenversagen in den ersten Lebensmonaten als Erstmanifestation einer Hyperoxalurie Typ I. Klin Padiatr 2010. [DOI: 10.1055/s-0030-1251049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Plank C, Gores H, Hartner A, Amann K, Dötsch J. Wurfgröße bestimmt Nephronanzahl und spätere Nierenschädigung nach intrauteriner Wachstumsrestriktion in der Ratte. Klin Padiatr 2010. [DOI: 10.1055/s-0030-1251051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Nüsken EC, Dittrich K, Plank C, Amann K, Dötsch J. Parvovirus B19-assoziierte FSGS-Rekurrenz nach Nierentransplantation? Klin Padiatr 2010. [DOI: 10.1055/s-0030-1251063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Dittrich K, Plank C, Amann K, Dötsch J, Fehrenbach H, Kemper M, Konrad M, Pohl M, Weber L. Beeinflusst die Art der Behandlung das Outcome der IgA-Nephropathie bei Kindern? Klin Padiatr 2010. [DOI: 10.1055/s-0030-1251047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Kolk A, Weitz J, Koch C, Bauer F, Pautke C, Hölzle F, Deppe H, Wolff KD, Plank C. Dreidimensionale Nukleinsäurebeschichtungen als Lösungsweg für kompromittierte Knochenverhältnisse. Zentralbl Chir 2009. [DOI: 10.1055/s-0029-1238144] [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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Abstract
The pancreas develops from ventral and dorsal buds, which undergo fusion. Failure to fuse results in pancreas divisum, which is defined by separate pancreatic ductal systems draining into the duodenum. Risk of developing pancreatitis is increased in pancreas divisum. MR cholangiopancreatography (MRCP) is the technique of choice for detecting it non-invasively. Annular pancreas is the result of incomplete rotation of the pancreatic bud around the duodenum with the persistence of parenchyma or a fibrous band encircling (stenosing) the duodenum. Acute pancreatitis is usually caused by bile duct stones or alcohol abuse. Contrast-enhanced multi-detector row CT is the method of choice to assess the extent of this disease. In acute pancreatitis, the role of MRCP is mainly limited to finding bile duct stones in patients with suspected biliary pancreatitis. Chronic pancreatitis results in relentless and irreversible loss of exocrine (and sometimes endocrine) function of the pancreas. MDCT even shows subtle calcifications. MRCP is the method of choice for non-invasive assessment of the duct. Inflammatory pseudotumor in chronic pancreatitis and groove pancreatitis are difficult to differentiate from pancreatic cancer. In these cases, multiple imaging methods such as MDCT, MRI and endosonography including biopsy may be used to make a diagnosis.
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MESH Headings
- Cholangiopancreatography, Magnetic Resonance
- Diagnosis, Differential
- Endosonography
- Granuloma, Plasma Cell/diagnosis
- Granuloma, Plasma Cell/etiology
- Granuloma, Plasma Cell/pathology
- Humans
- Pancreas/abnormalities
- Pancreas/pathology
- Pancreatic Diseases/diagnosis
- Pancreatic Diseases/etiology
- Pancreatic Diseases/pathology
- Pancreatic Neoplasms/diagnosis
- Pancreatic Neoplasms/pathology
- Pancreatitis, Acute Necrotizing/diagnosis
- Pancreatitis, Acute Necrotizing/etiology
- Pancreatitis, Acute Necrotizing/pathology
- Pancreatitis, Chronic/diagnosis
- Pancreatitis, Chronic/etiology
- Pancreatitis, Chronic/pathology
- Tomography, Spiral Computed
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Affiliation(s)
- W Schima
- Universitätsklinik für Radiodiagnostik, Medizinische Universität Wien, Wien, Osterreich. wolf
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Weitz J, Kolk A, Probst F, Koch C, Bauer F, Pautke C, Hölzle F, Wolff K, Plank C. Bioactive nucleic-acid coatings for implants as an innovative approach for difficult bone conditions—an experimental study in minipigs. Int J Oral Maxillofac Surg 2009. [DOI: 10.1016/j.ijom.2009.03.464] [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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Sauer AM, de Bruin KG, Ruthardt N, Mykhaylyk O, Plank C, Bräuchle C. Dynamics of magnetic lipoplexes studied by single particle tracking in living cells. J Control Release 2009; 137:136-45. [PMID: 19358868 DOI: 10.1016/j.jconrel.2009.04.003] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2008] [Revised: 03/30/2009] [Accepted: 04/02/2009] [Indexed: 10/20/2022]
Abstract
Magnetofection, gene delivery under the influence of a magnetic field, is a technique to increase transfection efficiency by enforcing gene vector contact with a target cell. Mechanisms of magnetic lipoplex internalization and intracellular details of magnetofection are still unknown. In this study, cellular dynamics of magnetic lipoplexes were examined in real time by means of highly sensitive dual-color fluorescence microscopy. Single particle tracking of magnetic lipoplexes provided trajectories representing the movement of the lipoplexes during internalization and subsequent intracellular processes. Magnetic lipoplexes show a three-phase behavior similar to polyplexes. During phase I lipoplexes are attached to the cell surface and show slow cooperative transport behavior. Phase II takes place inside the cell and was characterized by anomalous and confined diffusion. Phase III represented active transport along microtubules inside the cell. The majority of lipoplexes were internalized via endocytosis during phase I. On later time scales the formation of a perinuclear ring was observed. Persisting colocalization of fluid phase marker and lipoplexes after 24 h indicated slow endosomal release. In short, the internalization characteristics of magnetic lipoplexes are very similar to that of polyplexes. Furthermore our results suggest that the magnetic field induces an increased concentration of magnetic complexes on the cell surface resulting in higher transfection efficiency.
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Affiliation(s)
- A M Sauer
- Department of Chemistry and Biochemistry, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, D-81377 München, Germany
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Muñoz Javier A, del Pino P, Bedard MF, Ho D, Skirtach AG, Sukhorukov GB, Plank C, Parak WJ. Photoactivated release of cargo from the cavity of polyelectrolyte capsules to the cytosol of cells. Langmuir 2008; 24:12517-20. [PMID: 18844388 DOI: 10.1021/la802448z] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Polyelectrolyte capsules with metal nanoparticles in their walls and fluorescently labeled polymers as cargo inside their cavity were prepared. Capsules were ingested by living cells with no uncontrolled release of the cargo upon the incorporation process. Photoinduced heating of the metal nanoparticles in the capsule walls lead to rupture of the capsule walls, and the polymeric cargo was released to the whole cytosol. Viability tests demonstrate that opening of capsules at moderate light intensities does not impair the cellular metabolism, whereas capsule opening at high light intensities ultimately leads to cell death.
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Affiliation(s)
- A Muñoz Javier
- Fachbereich Physik, Philipps Universität Marburg, Marburg, Germany
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Orlando C, Copreni E, Mykhaylyk O, Castellani S, Zelphati O, Plank C, Conese M. Facilitation of lentiviral-mediated transduction of airway epithelial cells by magnetofection. J Cyst Fibros 2008. [DOI: 10.1016/s1569-1993(08)60082-x] [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: 10/22/2022]
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Jahnke A, Hirschberger J, Fischer C, Brill T, Köstlin R, Plank C, Küchenhoff H, Krieger S, Kamenica K, Schillinger U. Intra-tumoral gene delivery of feIL-2, feIFN-gamma and feGM-CSF using magnetofection as a neoadjuvant treatment option for feline fibrosarcomas: a phase-I study. ACTA ACUST UNITED AC 2008; 54:599-606. [PMID: 18045346 DOI: 10.1111/j.1439-0442.2007.01002.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Despite aggressive pre- or postoperative treatment, feline fibrosarcomas have a high relapse rate. In this study, a new treatment option based on immune stimulation by intra-tumoral delivery of three feline cytokine genes was performed. The objective of this phase-I dose-escalation study was to determine a safe dose for further evaluation in a subsequent phase-II trial. Twenty-five client-owned cats with clinical diagnosis of fibrosarcoma - primary tumours as well as recurrences - entered the study. Four increasing doses of plasmids coding for feIL-2, feIFN-gamma or feGM-CSF, respectively, were previously defined. In groups I, II, III and IV these doses were 15, 50, 150 and 450 microg per plasmid and a corresponding amount of magnetic nanoparticles. Two preoperative intra-tumoral injections of the magnetic DNA solution were followed by magnetofection. A group of four control cats received only surgical treatment. Side effects were registered and graded according to the VCOG-CTCAE scale and correlated to treatment. Statistical analyses included one-way anova, post hoc and Kruskal-Wallis tests. ELISA tests detecting plasma feIFN-gamma and plasma feGM-CSF were performed. One cat out of group IV (450 microg per plasmid) showed adverse events probably related to gene delivery. As these side effects were self-limiting and occurred only in one of eight cats in group IV, this dose was determined to be well tolerable. Altogether six cats developed local recurrences during a 1-year observation period. Four of these cats had been treated with dose IV. Regarding these observations, a subsequent phase-II trial including a representative amount of cats should be tested for the efficacy of dose IV as well as dose III.
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Affiliation(s)
- A Jahnke
- Clinic of Small Animal Medicine, Ludwig Maximilian University Munich, Veterinärstr. 13, 80539 Munich, Germany.
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Kolk A, Pautke C, Haczek C, Deppe H, Tischer T, Plank C. COPROGs protected BMP-2 gene vectors immobilized in poly(d,l-lactide) films on titanium implants m. Int J Oral Maxillofac Surg 2007. [DOI: 10.1016/j.ijom.2007.08.369] [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: 10/22/2022]
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Bodingbauer M, Tamandl D, Schmid K, Plank C, Schima W, Gruenberger T. Size of surgical margin does not influence recurrence rates after curative liver resection for colorectal cancer liver metastases. Br J Surg 2007; 94:1133-8. [PMID: 17514637 DOI: 10.1002/bjs.5762] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND The aim of this study was to examine the relationship between surgical margin status and site of recurrence after potentially curative liver resection for colorectal metastases using an ultrasonic dissection technique. METHODS Between January 2000 and December 2003, 176 patients underwent liver resection with curative intent for colorectal metastases at a single institution. Demographics, operative data, pathological margin status, site of recurrence and long-term survival data were collected prospectively and analysed. RESULTS On pathological analysis, resection margins were positive in 43 patients, negative by 1-9 mm in 110, and clear by more than 9 mm in 23 patients. At a median follow-up of 33 months, 133 of 176 patients had developed a recurrence, only five of whom had recurrence at the surgical margin. Recurrence at the surgical margin was not significantly related to the size of the margin. Overall, the median time to recurrence was 12.6 months, which was independent of surgical margin size, although there was a significantly higher proportion of patients with multiple metastases in the group with a positive margin (P = 0.008). Margin status did not correlate significantly with either recurrence-free or overall survival. CONCLUSION The rate of recurrence at the surgical margin was low and a positive margin was not associated with an increased risk of recurrence either at the surgical margin or elsewhere.
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Affiliation(s)
- M Bodingbauer
- Department of Surgery, Division of General Surgery, Hepatobiliary Service, Medical University of Vienna, Waehringer Guertel 18-20, A-1090 Vienna, Austria
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Abstract
The pancreas develops from ventral and the dorsal buds, which undergo fusion. Failure to fuse results in pancreas divisum, which is defined by separate pancreatic ductal systems draining into the duodenum. Risk of developing pancreatitis is increased in pancreas divisum because of insufficient drainage. MR cholangiopancreatography (MRCP) is the technique of choice for detecting pancreas divisum non-invasively. Annular pancreas is the result of incomplete rotation of the pancreatic bud around the duodenum with the persistence of parenchyma or a fibrous band encircling (and sometimes stenosing) the duodenum. Acute pancreatitis is usually caused by bile duct stones or alcohol abuse. The Atlanta classification differentiates between mild acute and severe acute pancreatitis associated with organ failure and/or local complications such as necrosis, abscess or pseudocyst. Contrast-enhanced multi-detector row CT is the method of choice to assess the extent of disease. Balthazar et al.'s CT severity index assesses the risk of mortality and morbidity. In acute pancreatitis, the role of MRCP is mainly limited to finding bile duct stones in patients with suspected biliary pancreatitis. Chronic pancreatitis results in relentless and irreversible loss of exocrine (and sometimes endocrine) function of the pancreas. MDCT even shows subtle calcifications. MRCP is the method of choice for non-invasive assessment of the duct. Inflammatory pseudotumor in chronic pancreatitis and groove pancreatitis are difficult to differentiate from pancreatic cancer. In these cases, multiple imaging methods such as MDCT, MRI and endosonography including biopsy may be used to make a diagnosis.
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Affiliation(s)
- W Schima
- Universitätsklinik für Radiodiagnostik, Medizinische Universität Wien, Osterreich.
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Abstract
Adenocarcinoma is the most common malignant pancreatic tumor, affecting the head in 60-70% of cases. By the time of diagnosis, approximately 80% of tumors are unresectable. Helical CT is very effective in detection and staging of adenocarcinoma, with a sensitivity of 76-92% for detection and an accuracy of 80-90% for staging, but it has limitations in the detection of small cancers (< or =2 cm). Multidetector CT (MDCT) has brought substantial improvements with its inherent 3D imaging capability. Mangafodipir-enhanced MRI is a problem-solving tool in the depiction of small cancers following an equivocal CT imaging result. Gadolinium-enhanced 3D gradient-echo MRI is helpful in the assessment of vascular invasion of cancer and in determining the etiology of cystic lesions. Serous cystadenoma is benign, has a lobulated contour and contains innumerable small cysts of 0.1-2 cm in diameter. Mucinous cystic neoplasms are unilocular or multilocular (fewer than six cysts), and the cyst diameter exceeds 2 cm. The presence of solid nodular components should alert the radiologist to suspect cystadenocarcinoma. Neuroendocrine tumors are mostly hypervascular. Diagnosis of insulinoma is a challenge: they are <2 cm in 90% of cases and mostly hypervascular at CT or MRI. A combination of contrast-enhanced MDCT, MRI, endosonography, and/or somatostatin receptor scintigraphy is used to detect these small tumors. This review summarizes the imaging features of the most common pancreatic tumors and discusses the limitations of CT, MRI and endosonography.
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Affiliation(s)
- W Schima
- Universitätsklinik für Radiodiagnostik, Medizinische Universität Wien, Währinger Gürtel 18-20, 1090 Wien, Osterreich.
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Langenberger H, Friedrich K, Plank C, Matzek W, Wolf F, Herold CJ. MDCTA der Pulmonalarterien an Patienten mit suspizierter Pulmonalembolie: Vergleich zwischen Iomeprol 400 mgI/ml und Iodixanol 320 mgI/ml unter Applikation einer äquivalenten Joddosis. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-977171] [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: 10/21/2022]
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Schroth M, Plank C, Meißner U, Eberle K, Cesnjevar R, Dötsch J, Rascher W. Hypertonic-Hyperoncotic Solutions Improve Cardiac Function in Children after Open Heart Surgery. Z Geburtshilfe Neonatol 2006. [DOI: 10.1055/s-2006-946243] [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: 10/19/2022]
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Plank C, Ostreicher I, Hartner A, Marek I, Struwe FG, Amann K, Hilgers KF, Rascher W, Dötsch J. Intrauterine growth retardation aggravates the course of acute mesangioproliferative glomerulonephritis in the rat. Kidney Int 2006; 70:1974-82. [PMID: 17051140 DOI: 10.1038/sj.ki.5001966] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Intrauterine growth retardation (IUGR) aggravates the course of acute mesangioproliferative glomerulonephritis (GN) in the rat. Observational studies in children suggest that IUGR may be associated with a severe course of kidney diseases such as IgA nephropathy. We tested the hypothesis that IUGR leads to aggravation of acute mesangioproliferative GN in former IUGR rats. IUGR was induced in Wistar rats by isocaloric protein restriction in pregnant dams. Litter size was reduced to six male neonates in low protein animals (LP) and normal protein animals (NP). At 8 weeks GN was induced by injection of an anti-Thy-1.1 antibody. Rats were killed on days 4 and 14 after induction of GN and kidneys were investigated for inflammation and sclerosis using real-time polymerase chain reaction and histological methods. On day 4 after induction of GN, LP animals showed more glomerulosclerosis and tubulointerstitial lesions. On day 14, inflammatory markers (expression of monocyte chemoattractant protein 1, osteopontin, tumor necrosis factor and interleukin-6), extracellular matrix accumulation and markers of sclerosis (plasminogen activator inhibitor-1 expression, transforming growth factor-beta1 expression, score for glomerulosclerosis, glomerular deposition of collagen I and collagen IV) were more severe in LP animals. Some degree of induction of inflammatory and profibrotic markers was also present in non-nephritic LP animals. However, these rats did not display marked glomerulosclerosis or interstitial fibrosis. We conclude that after IUGR inflammatory damage is aggravated and the reparation of the kidney is impaired during the course of acute mesangioproliferative GN, leading to more sclerotic lesions.
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Affiliation(s)
- C Plank
- Department of Pediatrics and Adolescent Medicine, University Erlangen-Nuremberg, Erlangen, Germany.
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Struwe E, Beckmann MW, Blessing H, Dötsch J, Drexel L, Frenzel J, Goecke T, Hauck B, Kirschbaum M, Meurer B, Möller J, Plank C, Scheler C, Schild RL, Schleussner E, Stuppy A, Weidinger M, Winzer H. Die FIPS-Studie (Fetale Programmierung–Intrauterine Wachstumsrestriktion–Plazentare Marker–Studie). Geburtshilfe Frauenheilkd 2006. [DOI: 10.1055/s-2006-952743] [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] Open
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Xenariou S, Griesenbach U, Ferrari S, Dean P, Scheule RK, Cheng SH, Geddes DM, Plank C, Alton EWFW. Using magnetic forces to enhance non-viral gene transfer to airway epithelium in vivo. Gene Ther 2006; 13:1545-52. [PMID: 16738690 DOI: 10.1038/sj.gt.3302803] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We have assessed whether magnetic forces (magnetofection) can enhance non-viral gene transfer to the airways. TransMAG(PEI), a superparamagnetic particle was coupled to Lipofectamine 2000 or cationic lipid 67 (GL67)/plasmid DNA (pDNA) liposome complexes. In vitro transfection with these formulations resulted in approximately 300- and 30-fold increase in reporter gene expression, respectively, after exposure to a magnetic field, but only at suboptimal pDNA concentrations. Because GL67 has been formulated for in vivo use, we next assessed TransMAG(PEI) in the murine nasal epithelium in vivo, and compared this to naked pDNA. At the concentrations required for in vivo experiments, precipitation of magnetic complexes was seen. After extensive optimization, addition of non-precipitated magnetic particles resulted in approximately seven- and 90-fold decrease in gene expression for naked pDNA and GL67/pDNA liposome complexes, respectively, compared to non-magnetic particles. Thus, whereas exposure to a magnetic field improved in vitro transfection efficiency, translation to the in vivo setting remains difficult.
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Affiliation(s)
- S Xenariou
- Department of Gene Therapy, National Heart and Lung Institute, Faculty of Medicine, Imperial College, 1B Manresa Road, London SW3 6LR, UK
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Schroth M, Plank C, Meißner U, Eberle K, Cesnjevar R, Dötsch J, Rascher W. Hypertonic-Hyperoncotic Solutions Improve Cardiac Function in Children after Open Heart Surgery. Z Geburtshilfe Neonatol 2006. [DOI: 10.1055/s-2006-943328] [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: 10/19/2022]
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Schernthaner GH, Plank C, Minar E, Bieglmayer C, Koppensteiner R, Schernthaner G. No effect of homocysteine-lowering therapy on vascular inflammation and haemostasis in peripheral arterial occlusive disease. Eur J Clin Invest 2006; 36:333-9. [PMID: 16634837 DOI: 10.1111/j.1365-2362.2006.01639.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Although peripheral arterial occlusive disease (PAOD) is significantly associated with elevated homocysteine levels, the clinical relevance of hyperhomocysteinaemia for the prevention and progression of PAOD is still unknown. MATERIALS AND METHODS A total of 65 patients suffering from symptomatic PAOD with elevated homocysteine levels were randomized onto placebo or B-vitamins (50 mg thiaminhydrochlorid, 50 mg pyridoxine, and 0.05 mg cyanocobalamin), plus 5 mg folic acid daily for 6 weeks. Serum levels of folic acid, vitamin B12, creatinine, ultra-sensitive C-reactive protein (usCRP), interleukin (IL)-6, IL-8, IL-18, monocyte-chemo-attractant-protein-1 (MCP-1) and plasma levels of homocysteine, tissue factor (TF) and tissue factor pathway inhibitor (TFPI) were determined on the 1st day and 42nd day. Primary outcome was reduction of homocysteine, secondary outcomes were reduction of usCRP, IL-6, IL-8, Il-18, MCP-1, TF and TFPI. RESULTS The mean reduction of homocysteine concentration was 33% (95%CI 33.36-55.76, or 18.9+/-5.4 micromol L-1-12.6+/-2.8 micromol L-1, P=0) in the B-vitamin group compared with 1% in the placebo group. Folic acid (P=0) and vitamin B12 (P=0) increased significantly in the verum group, but both remained unchanged in the control group. No treatment effect of lowering of homocysteine on any markers of haemostasis (TF, TFPI) or inflammation (usCRP, IL-6, IL-8, IL-18 and MCP-1) was observed. CONCLUSION Although homocysteine is associated with vascular disease risk in the general population and in particular with PAOD, marked lowering of homocysteine concentrations by folic acid and B-vitamin supplementation does not influence inflammatory responses involving usCRP, IL-6, IL-8, IL-18 and MCP-1, nor tissue factor. These results provide evidence against a major effect of hyperhomocysteinaemia on vascular chronic inflammation or coagulation in patients with symptomatic peripheral arterial occlusive disease.
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Affiliation(s)
- G-H Schernthaner
- Department of Internal Medicine II, Medical University of Vienna, and Department of Internal Medicine I, Rudolfstiftung Hospital, Vienna, Austria.
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Porst M, Plank C, Bieritz B, Konik E, Fees H, Dötsch J, Hilgers KF, Reinhardt DP, Hartner A. Fibrillin-1 regulates mesangial cell attachment, spreading, migration and proliferation. Kidney Int 2006; 69:450-6. [PMID: 16395273 DOI: 10.1038/sj.ki.5000030] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The microfibrillar protein fibrillin-1 is present in many organs, including the vasculature, eye, and dermis, and is thought to convey structural anchorage and elastic strength. Fibrillin-1 is also a component of the mesangial matrix. To assess the functional relevance of fibrillin-1 for cell-matrix interactions in the glomerulus, we studied the attachment, spreading, migration and proliferation of mesangial cells on fibrillin-1 and the regulation of fibrillin-1 in experimental anti-Thy1.1 nephritis displaying mesangial cell migration and proliferation in vivo. During the acute phase of experimental Thy1.1 nephritis, glomerular fibrillin-1 messenger ribonucleic acid expression and protein immunoreactivity were significantly induced as compared to controls. In a hexosaminidase-based adhesion assay, mesangial cells showed concentration-dependent attachment to fibrillin-1, similar to what was observed for fibronectin. The cell attachment was Arg-Gly-Asp dependent. Further, fibrillin-1 significantly promoted spreading and focal contact formation detected by immunostaining for vinculin. Mesangial cell migration, assessed by a transmigration assay, and proliferation, measured by a 5-bromo-2'-deoxy-uridine incorporation assay, were augmented by fibrillin-1. In diabetic mice underexpressing fibrillin-1, glomerular cell proliferation, determined by counting proliferating cell nuclear antigen-positive cells in renal sections, was significantly lower than in diabetic control mice. We conclude that fibrillin-1 promotes mesangial cell attachment, spreading, migration, and proliferation. We speculate that fibrillin-1 may thus contribute to mesangial hypercellularity during glomerular disease.
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Affiliation(s)
- M Porst
- Klinik für Kinder und Jugendliche, Universität Erlangen-Nürnberg, Erlangen, Germany
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Kolk A, Pautke C, Haczek C, Deppe H, Neff A, Vogt S, Stemberger A, Plank C. Bone healing by non-viral BMP-2 gene transfer — a novel vector release out of a mechanically stable PDLLA-coating of metallic surfaces. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)83798-x] [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: 11/29/2022]
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Trattnig S, Pinker K, Krestan C, Plank C, Millington S, Marlovits S. Matrix-based autologous chondrocyte implantation for cartilage repair with Hyalograft®C: Two-year follow-up by magnetic resonance imaging. Eur J Radiol 2006; 57:9-15. [PMID: 16183239 DOI: 10.1016/j.ejrad.2005.08.006] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2005] [Revised: 08/15/2005] [Accepted: 08/16/2005] [Indexed: 11/17/2022]
Abstract
OBJECTIVE Monitoring of articular cartilage repair after matrix-associated autologous chondrocyte implantation with HyalograftC by a new grading system based on non-invasive high-resolution magnetic resonance imaging. PATIENTS AND METHODS In 23 patients, postoperative magnetic resonance imaging (MRI) was performed between 76 and 120 weeks. In nine of these patients, five MRI examinations were performed at 4, 12, 24, 52 and 104 weeks after HyalograftC implant. The repair tissue was described with separate variables: degree of defect repair in width and length, signal intensity of the repair tissue and status of the subchondral bone. For these variables a grading system with point scale evaluation was applied. RESULTS CONCLUSION High-resolution MRI provides a non-invasive tool for monitoring the development of cartilage repair tissue following HyalograftC technology, shows a good correlation with clinical outcome and may help to differentiate abnormal repair tissue from a normal maturation process.
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Affiliation(s)
- S Trattnig
- Department of Radiology, University Hospital of Vienna, Medical University of Vienna, Austria.
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Trattnig S, Pinker K, Krestan C, Plank C, Millington S, Marlovits S. Matrix-based autologous chondrocyte implantation for cartilage repair with HyalograftC: two-year follow-up by magnetic resonance imaging. Eur J Radiol 2005. [PMID: 16183239 DOI: 10.1016/j.ejrad.2005.08.006.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/01/2022]
Abstract
OBJECTIVE Monitoring of articular cartilage repair after matrix-associated autologous chondrocyte implantation with HyalograftC by a new grading system based on non-invasive high-resolution magnetic resonance imaging. PATIENTS AND METHODS In 23 patients, postoperative magnetic resonance imaging (MRI) was performed between 76 and 120 weeks. In nine of these patients, five MRI examinations were performed at 4, 12, 24, 52 and 104 weeks after HyalograftC implant. The repair tissue was described with separate variables: degree of defect repair in width and length, signal intensity of the repair tissue and status of the subchondral bone. For these variables a grading system with point scale evaluation was applied. RESULTS CONCLUSION High-resolution MRI provides a non-invasive tool for monitoring the development of cartilage repair tissue following HyalograftC technology, shows a good correlation with clinical outcome and may help to differentiate abnormal repair tissue from a normal maturation process.
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Affiliation(s)
- S Trattnig
- Department of Radiology, University Hospital of Vienna, Medical University of Vienna, Austria.
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Friedman JE, Zabriskie JB, Plank C, Ablashi D, Whitman J, Shahan B, Edgell R, Shieh M, Rapalino O, Zimmerman R, Sheng D. A randomized clinical trial of valacyclovir in multiple sclerosis. Mult Scler 2005; 11:286-95. [PMID: 15957509 DOI: 10.1191/1352458505ms1185oa] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVE The human Herpesvirus type-6 (HHV-6) has been implicated in multiple sclerosis (MS). Valacyclovir is an antiviral agent with an excellent safety profile. A two-year placebo-controlled, double-blind study was conducted to (1) ascertain if high-dose, prolonged treatment with valacyclovir would be safe and (2) observe if valacyclovir would delay the progression of MS clinically or by magnetic resonance imaging (MRI). DESIGN/METHODS Fifty-eight patients were stratified as to severity and randomly assigned to receive valacyclovir (3000 mg/day) or placebo for a period of two years. Patients were followed clinically over the two-year period by means of the Expanded Disability Status Scale (EDSS), the Ambulation Index (AI) and brain MRI scans. Patients underwent routine lab studies every three months. Patients continued on the medication for two years unless they had a sustained progression or repeated exacerbations. RESULTS No patient discontinued the study due to side effects or toxicity. In Relative Ranking of Progression, time to first attack, attack rate, and time to withdrawal there were trends (but not statistically significant) toward drug effect over placebo in the Severe clinical category. MRI evaluation showed no significant drug effect. CONCLUSIONS Although not statistically significant, positive trends were detected for acyclovir by clinical measures, but not by MRI.
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Affiliation(s)
- J E Friedman
- Department of Neurology, New York University School of Medicine, NY, NY 10010, USA.
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Schroth M, Plank C, Meißner U, Eberle KP, Cesnjevar R, Weyand M, Rascher W, Dötsch J. Hämodynamische Effektivität hyperton-hyperonkotischer Kochsalzösungen bei Kindern nach herzchirurgischen Eingriffen. Z Geburtshilfe Neonatol 2005. [DOI: 10.1055/s-2005-871402] [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: 10/19/2022]
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Kolk A, Pautke C, Haczek C, Deppe H, Neff A, Stemberger A, Plank C. Non-viral BMP-2 gene transfer—A novel vector release out of a pdlla-coating of metallic surfaces to enhance the bone-implant interface. Int J Oral Maxillofac Surg 2005. [DOI: 10.1016/s0901-5027(05)81164-6] [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: 10/24/2022]
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Rudolph C, Ortiz A, Schillinger U, Jauernig J, Plank C, Rosenecker J. Methodological optimization of polyethylenimine (PEI)-based gene delivery to the lungs of mice via aerosol application. J Gene Med 2005; 7:59-66. [PMID: 15538727 DOI: 10.1002/jgm.646] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Polyethylenimine (PEI) has been successfully used for gene delivery to the lungs of mice via aerosol application using a whole body nebulization device. In this report we optimized the design of such an aerosol device. METHODS Aerosol devices were constructed as either serial inhalation apparatus or as a whole body nebulization chamber connected to an aerosol spacer placed in a horizontal or vertical position. PEI-based gene vectors were nebulized using a standard jet nebulizer and luciferase gene expression of various tissues was examined. RESULTS Using a whole body aerosol device resulted in luciferase gene expression in the lungs of mice at the same level as compared with a serial inhalation apparatus. Whereas gene expression was enhanced in the presence of 5% CO(2)-in-air, anesthesia of mice strongly decreased gene expression even when mice were intubated with an intravascular cannula. Reduction of the median mass aerodynamic diameter (MMAD) of the aerosol from 3.4 to 0.27 microm by interposition of an aerosol spacer increased gene expression significantly 3-fold. Drying of the aerosol by silica gel additionally increased gene delivery significantly 3-fold. Reporter gene expression mediated by branched PEI 25 kDa was 9- and 15-fold higher as compared with linear PEIs of 22 and 25 kDa, respectively, and was dependent on the DNA concentration. Gene expression was detectable as soon as 6 h after gene vector application and reached a maximum after 72 h but was still detectable after 14 days. The presence of Zn(2+) did not increase gene expression. CONCLUSION We propose aerosol drying as a novel and simple method of optimizing PEI-based gene delivery to the lungs.
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Affiliation(s)
- C Rudolph
- Department of Pediatrics, Ludwig-Maximilians University, 80337 Munich, Germany.
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Ueblacker P, Wagner B, Krüger A, Vogt S, DeSantis G, Kennerknecht E, Brill T, Hillemanns M, Salzmann GM, Imhoff AB, Plank C, Gänsbacher B, Martinek V. Inducible nonviral gene expression in the treatment of osteochondral defects. Osteoarthritis Cartilage 2004; 12:711-9. [PMID: 15325637 DOI: 10.1016/j.joca.2004.05.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2004] [Accepted: 05/25/2004] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The repair of osteochondral defects with chondrocytes genetically modified to express desired growth factors promises great potential in orthopaedic therapy. Controlled expression of the transgenes is required in many instances. The objective of the present study was to demonstrate the inducibility of tetracycline-responsive transgene expression in osteochondral defects in the knee joint filled with genetically modified chondrocyte implants. METHODS An expression plasmid containing the lacZ gene under the control of the minimal CMV promoter fused to the Tet-responsible element (TRE) as well as the reverse transactivator (rtTA2s-M2) was constructed and used to transfect isolated articular chondrocytes from New Zealand white rabbits. rtTA2s-M2 binds to the TRE in the presence of tetracycline and leads to the transcription of the transgene. Different concentrations of DNA and various DNA:lipid ratios were tested to determine best transfection conditions. Transfection efficiency and inducibility were analysed by histochemical analysis and flow-cytometry. To evaluate the system in vivo, collagen-sponges were seeded with transfected autologous chondrocytes and implanted in osteochondral defects in the knees of NZW-rabbits. Gene expression was induced by doxycycline and 3 weeks later, LacZ-expression in isolated knee joints was evaluated in histological sections by X-gal staining. RESULTS In vitro 13.5% (+/-1.32) of induced primary chondrocytes were LacZ-positive, while non-induced controls showed a background-staining in 0.6% (+/-0.2). In vivo, upon doxycycline treatment, induction of lacZ-gene-expression could be demonstrated in chondrocytes in 3-week-old, well-integrated implants. CONCLUSION For the first time, tetracycline-inducible gene expression is demonstrated to work in the treatment of osteochondral defects. This demonstrates the feasibility for a gene therapy-assisted approach using controlled expression of therapeutic growth factors from transplanted genetically modified chondrocytes.
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Affiliation(s)
- P Ueblacker
- Department of Orthopaedic Sports Medicine, Technical University Munich, Connollystrasse 32, 80809 Munich, Germany.
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