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Huber T, Boedecker C, Borchardt T, Vradelis L, Wachter N, Grimminger PP, Musholt TJ, Mädge S, Griemert EV, Heinrich S, Huettl F, Lang H. Education Team Time Out in Oncologic Visceral Surgery Optimizes Surgical Resident Training and Team Communication-Results of a Prospective Trial. J Surg Educ 2023; 80:1215-1220. [PMID: 37455191 DOI: 10.1016/j.jsurg.2023.06.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 04/07/2023] [Revised: 06/09/2023] [Accepted: 06/18/2023] [Indexed: 07/18/2023]
Abstract
BACKGROUND Surgical education is highly dependent on intraoperative communication. Trainers must know the trainee's training level to ensure high-quality surgical training. A systematic preoperative dialogue (Educational Team Time Out, ETO) was established to discuss the steps of each surgical procedure. METHODS Over 6 months, ETO was performed within a time limit of 3 minutes. Digital surveys on the utility of ETO and its impact on performance were conducted immediately after surgery and at the end of the study period among the staff of the participating disciplines (trainer, trainee, surgical nursing staff, anaesthesiologists, and medical students). The number of surgical substeps performed was recorded and compared with the equivalent period one year earlier. RESULTS ETO was performed in 64 of the 103 eligible operations (62%). Liver resection (n = 37) was the most frequent procedure, followed by left-sided colorectal surgery (n = 12), partial pancreaticoduodenectomy (n = 6), right-sided hemicolectomies (n = 5), and thyroidectomies (n = 4). Anaesthesiologists most frequently reported that ETO had a direct impact on their work during surgery (90.9%). The influence scores were 46.8% for trainees, 8.8% for trainers, 53.3% for surgical nursing staff and 66.6% for medical students. During the implementation of ETO, a trend towards more assisted substeps in oncologic visceral surgery was seen compared to the corresponding period one year earlier (51% vs.40%; p = 0.11). CONCLUSION ETO leads to improved intraoperative communication and more performed substeps during complex procedures, which increases motivation and practical training. This concept can easily be implemented in all surgical specialties to improve surgical education.
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Affiliation(s)
- T Huber
- Department of General, Visceral and Transplant Surgery, University Medical Center Mainz, Mainz, Germany.
| | - C Boedecker
- Department of General, Visceral and Transplant Surgery, University Medical Center Mainz, Mainz, Germany
| | - T Borchardt
- Department of General, Visceral and Transplant Surgery, University Medical Center Mainz, Mainz, Germany
| | - L Vradelis
- Department of General, Visceral and Transplant Surgery, University Medical Center Mainz, Mainz, Germany
| | - N Wachter
- Department of General, Visceral and Transplant Surgery, University Medical Center Mainz, Mainz, Germany
| | - P P Grimminger
- Department of General, Visceral and Transplant Surgery, University Medical Center Mainz, Mainz, Germany
| | - T J Musholt
- Department of General, Visceral and Transplant Surgery, University Medical Center Mainz, Mainz, Germany
| | - S Mädge
- Central OR Management, University Medical Center Mainz, Mainz, Germany
| | - E V Griemert
- Department of Anaesthesiology University Medical Center Mainz, Mainz, Germany
| | - S Heinrich
- Department of General, Visceral and Transplant Surgery, University Medical Center Mainz, Mainz, Germany
| | - F Huettl
- Department of General, Visceral and Transplant Surgery, University Medical Center Mainz, Mainz, Germany
| | - H Lang
- Department of General, Visceral and Transplant Surgery, University Medical Center Mainz, Mainz, Germany
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Borchardt T, Helmke A, Ernst J, Emmert S, Schilling AF, Felmerer G, Viöl W. Topically Confined Enhancement of Cutaneous Microcirculation by Cold Plasma. Skin Pharmacol Physiol 2022; 35:343-353. [PMID: 36353780 PMCID: PMC9811424 DOI: 10.1159/000527700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 10/10/2022] [Indexed: 11/11/2022]
Abstract
INTRODUCTION We aim to explore potentials and modalities of cold atmospheric pressure plasma (CAP) for the subsequent development of therapies targeting an increased perfusion of the lower leg skin tissue. In this study, we addressed the question whether the microcirculation enhancement is restricted to the tissue in direct contact with plasma or if adjacent tissue might also benefit. METHODS A dielectric barrier discharge (DBD)-generated CAP device exhibiting an electrode area of 27.5 cm2 was used to treat the anterior lower leg of ten healthy subjects for 4.5 min. Subsequently, hyperspectral imaging was performed to measure the tempospatially resolved characteristics of microcirculation parameters in superficial (up to 1 mm) and deeper (up to 5 mm) skin layers. RESULTS In the tissue area covered by the plasma electrode, DBD-CAP treatment enhances most of the perfusion parameters. The maximum oxygen saturation increase reached 8%, the near-infrared perfusion index (NIR) increased by a maximum of 4%, and the maximum tissue hemoglobin increase equaled 14%. Tissue water index (TWI) was lower in both the control and the plasma groups, thus not affected by the DBD-CAP treatment. Yet, our study reveals that adjacent tissue is hardly affected by the enhancements in the electrode area, and the effects are locally confined. CONCLUSION Application of DBD-CAP to the lower leg resulted in enhancement of cutaneous microcirculation that extended 1 h beyond the treatment period with localization to the tissue area in direct contact with the cold plasma. This suggests the possibility of tailoring application schemes for topically confined enhancement of skin microcirculation, e.g., in the treatment of chronic wounds.
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Affiliation(s)
- Thomas Borchardt
- Faculty of Engineering and Health, HAWK University of Applied Sciences and Arts, Goettingen, Germany,*Thomas Borchardt,
| | - Andreas Helmke
- Faculty of Engineering and Health, HAWK University of Applied Sciences and Arts, Goettingen, Germany
| | - Jennifer Ernst
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen. Georg-August-University, Goettingen, Germany
| | - Steffen Emmert
- Clinic and Policlinic for Dermatology and Venereology, University Medical Center Rostock, Rostock, Germany
| | - Arndt F. Schilling
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen. Georg-August-University, Goettingen, Germany
| | - Gunther Felmerer
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen. Georg-August-University, Goettingen, Germany
| | - Wolfgang Viöl
- Faculty of Engineering and Health, HAWK University of Applied Sciences and Arts, Goettingen, Germany
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Geyer M, Schönfeld C, Schreiyäck C, Susanto S, Michel C, Looso M, Braun T, Borchardt T, Neumann E, Müller-Ladner U. Comparative transcriptional profiling of regenerating damaged knee joints in two animal models of the newt Notophthalmus viridescens strengthens the role of candidate genes involved in osteoarthritis. Osteoarthritis and Cartilage Open 2022; 4:100273. [DOI: 10.1016/j.ocarto.2022.100273] [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] [Received: 05/05/2022] [Revised: 05/10/2022] [Accepted: 05/12/2022] [Indexed: 10/18/2022] Open
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Ernst J, Tanyeli M, Borchardt T, Ojugo M, Helmke A, Viöl W, Schilling AF, Felmerer G. Effect on healing rates of wounds treated with direct cold atmospheric plasma: a case series. J Wound Care 2021; 30:904-914. [PMID: 34747217 DOI: 10.12968/jowc.2021.30.11.904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 11/11/2022]
Abstract
OBJECTIVE The response of different critical acute and hard-to-heal wounds to an innovative wound care modality-direct application of cold atmospheric plasma (CAP)-was investigated in this clinical case series. METHOD Over an observation period of two years, acute wounds with at least one risk factor for chronification, as well as hard-to-heal wounds were treated for 180 seconds three times per week with CAP. CAP treatment was additional to standard wound care. Photographs were taken for wound documentation. The wound sizes before the first CAP treatment, after four weeks, after 12 weeks and at wound closure/end of observation time were determined using image processing software, and analysed longitudinally for the development of wound size. RESULTS A total of 27 wounds (19 hard-to-heal and eight acute wounds) with a mean wound area of 15cm2 and a mean wound age of 49 months were treated with CAP and analysed. All (100%) of the acute wounds and 68% of the hard-to-heal wounds healed after an average treatment duration of 14.2 weeks. At the end of the observation period, 21% of hard-to-heal wounds were not yet closed but were reduced in size by >80%. In 11% of the hard-to-heal wounds (n=2) therapy failed. CONCLUSION The results suggested a beneficial effect of additional CAP therapy on wound healing. DECLARATION OF INTEREST This work was carried out within the research projects 'Plasma for Life' (funding reference no. 13FH6I04IA) with financial support from the German Federal Ministry of Education and Research (BMBF). In the past seven years AFS has provided consulting services to Evonik and has received institutional support by Heraeus, Johnson & Johnson and Evonik. There are no royalties to disclose. The Department for Trauma Surgery, Orthopaedics and Plastic Surgery received charitable donations by CINOGY GmbH. CINOGY GmbH released the di_CAP devices and electrodes for the study. WV and AH were involved in the development of the used di_CAP device (Plasmaderm, CINOGY GmbH). WV is shareholder of the outsourced start-up company CINOGY GmbH.
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Affiliation(s)
- Jennifer Ernst
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Georg-August-University, Goettingen, Germany
| | - Murat Tanyeli
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Georg-August-University, Goettingen, Germany
| | - Thomas Borchardt
- Department of Sciences and Technology, University of Applied Sciences and Arts, Goettingen, Germany
| | - Moses Ojugo
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Georg-August-University, Goettingen, Germany
| | - Andreas Helmke
- Department of Sciences and Technology, University of Applied Sciences and Arts, Goettingen, Germany.,Application Center for Plasma and Photonic, Fraunhofer Institute for Surface Engineering and Thin Films IST, Goettingen, Germany
| | - Wolfgang Viöl
- Department of Sciences and Technology, University of Applied Sciences and Arts, Goettingen, Germany.,Application Center for Plasma and Photonic, Fraunhofer Institute for Surface Engineering and Thin Films IST, Goettingen, Germany
| | - Arndt F Schilling
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Georg-August-University, Goettingen, Germany
| | - Gunther Felmerer
- Department of Trauma Surgery, Orthopaedics and Plastic Surgery, University Medical Center Goettingen, Georg-August-University, Goettingen, Germany
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Nikorowitsch J, Borchardt T, Appelbaum S, Ojeda F, Lackner KJ, Schnabel RB, Blankenberg S, Zeller T, Karakas M. P3642Predictive value of soluble urokinase-type plasminogen activator receptor for cardiovascular death and non-fatal myocardial infarction in patients with coronary artery disease. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz745.0499] [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
Introduction
Stratification for subsequent coronary events among patients with coronary artery disease (CAD) is of considerable interest due to the potential to guide secondary preventive therapies. Soluble urokinase-type plasminogen activator receptor (suPAR) is expressed on various cells involved in atherogenesis and plaque instability, and has been associated with poor clinical outcomes in patients with various conditions.
Purpose
In this study we investigated the potential role of suPAR as a prognostic biomarker for adverse outcome in patients with CAD, and acute coronary syndrome (ACS) in particular.
Methods
Plasma levels of suPAR were measured in a cohort of 1,703 patients (AtheroGene Study) with documented coronary artery disease –including 626 patients with ACS and 1077 patients with stable angina pectoris (SAP). The main outcome measures were defined as cardiovascular death and non-fatal myocardial infarction (MI). Survival curves for the endpoints considered were computed according to thirds of the suPAR distribution. The equality of survival curves was tested using the log-rank test. Multivariable models adjusted for common cardiovascular risk factors and the biomarkers CRP, NT-proBNP and high-sensitivity troponin I (hs-TnI) in particular were also computed.
Results
The prognostic utility of suPAR was evidenced by survival curves stratified for tertiles of circulating suPAR levels –both, in the overall cohort (p=0.00062), and in the ACS cohort (p=0.00099) with a median follow-up of 3,5 years. In multivariable-adjusted Cox regression analyses the hazard ratio (HR) for the prediction of cardiovascular death was 3.60 for log-transformed suPAR levels (p<0.001) in the overall CAD cohort, whereas it was 3.34 (p=0.003) in the ACS cohort. The HR regarding prediction of the combined outcome cardiovascular death and/or non-fatal MI during follow-up was 2.19 (p<0.001) in the overall cohort, and 2.56 (p<0.001) in the ACS cohort. After multivariate adjustment, including conventional cardiovascular risk factors and hs-TnI, suPAR, after log transformation, still enabled a reliable and strong prediction of future cardiovascular death with a HR of 3.17 (p<0.001) in the overall CAD cohort, and a HR of 2.85 (p=0.014) in the ACS cohort.
Conclusions
Our study demonstrates that suPAR has a strong prognostic value independent of hs-TnI in secondary prevention settings, and thereby might represent a valuable biomarker for risk estimation in CAD.
Acknowledgement/Funding
Stiftung Rheinland-Pfalz für Innovation, European Union 7th Framework Programme, DZHK e.V., ERA-Net, Abbott Diagnostics
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Affiliation(s)
| | - T Borchardt
- University Heart Center Hamburg, Hamburg, Germany
| | - S Appelbaum
- University Heart Center Hamburg, Hamburg, Germany
| | - F Ojeda
- University Heart Center Hamburg, Hamburg, Germany
| | - K J Lackner
- University Medical Center of Mainz, Department of Laboratory Medicine, Mainz, Germany
| | - R B Schnabel
- University Heart Center Hamburg, Hamburg, Germany
| | | | - T Zeller
- University Heart Center Hamburg, Hamburg, Germany
| | - M Karakas
- University Heart Center Hamburg, Hamburg, Germany
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Borchardt T, Ernst J, Helmke A, Tanyeli M, Schilling AF, Felmerer G, Viöl W. Effect of direct cold atmospheric plasma (diCAP) on microcirculation of intact skin in a controlled mechanical environment. Microcirculation 2017; 24:e12399. [PMID: 28857373 PMCID: PMC6084368 DOI: 10.1111/micc.12399] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [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: 05/06/2017] [Accepted: 08/24/2017] [Indexed: 01/07/2023]
Abstract
OBJECTIVE The microcirculatory response of intact human skin to exposure with diCAP for different durations with a focus on the effect of implied mechanical pressure during plasma treatment was investigated. METHODS Local relative hemoglobin, blood flow velocity, tissue oxygen saturation, and blood flow were monitored noninvasively for up to 1 hour in 1-2 mm depth by optical techniques, as well as temperature, pH values, and moisture before and after skin stimulation. The experimental protocol (N = 10) was set up to differentiate between pressure- and plasma-induced effects. RESULTS Significant increases in microcirculation were only observed after plasma stimulation but not after pressure stimulus alone. For a period of 1 h after stimulation, local relative hemoglobin was increased by 5.1% after 270 seconds diCAP treatment. Tissue oxygen saturation increased by up to 9.4%, whereas blood flow was doubled (+106%). Skin pH decreased by 0.3 after 180 seconds and 270 seconds diCAP treatment, whereas skin temperature and moisture were not affected. CONCLUSIONS diCAP treatment of intact skin notably enhances microcirculation for a therapeutically relevant period. This effect is specific to the plasma treatment and not an effect of the applied pressure. Prolonged treatment durations lead to more pronounced effects.
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Affiliation(s)
- Thomas Borchardt
- Department of Sciences and TechnologyUniversity of Applied Sciences and ArtsGoettingenGermany
| | - Jennifer Ernst
- Division of Plastic SurgeryDepartment of Trauma Surgery, Orthopaedics and Plastic SurgeryUniversity Medical Center GoettingenGeorg‐August‐UniversityGoettingenGermany
| | - Andreas Helmke
- Application Center for Plasma and PhotonicFraunhofer Institute for Surface Engineering and Thin Films ISTGoettingenGermany
| | - Murat Tanyeli
- Division of Plastic SurgeryDepartment of Trauma Surgery, Orthopaedics and Plastic SurgeryUniversity Medical Center GoettingenGeorg‐August‐UniversityGoettingenGermany
| | - Arndt F. Schilling
- Department of Trauma Surgery, Orthopaedics and Plastic SurgeryUniversity Medical Center GoettingenGeorg‐August‐UniversityGoettingenGermany
| | - Gunther Felmerer
- Division of Plastic SurgeryDepartment of Trauma Surgery, Orthopaedics and Plastic SurgeryUniversity Medical Center GoettingenGeorg‐August‐UniversityGoettingenGermany
| | - Wolfgang Viöl
- Department of Sciences and TechnologyUniversity of Applied Sciences and ArtsGoettingenGermany,Application Center for Plasma and PhotonicFraunhofer Institute for Surface Engineering and Thin Films ISTGoettingenGermany
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Susanto S, Schreiyäck C, Geyer M, Borchardt T, Müller-Ladner U, Dinser R. AB0140 Investigation of joint regeneration mechanisms in NEWTS (notophthalmus viridescens). Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.140] [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: 11/03/2022]
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Reijnders PJH, Brasseur SMJM, Tougaard S, Seibert U, Borchardt T, Stede M. Population development and status of harbour seals ( Phoca vitulina) in the Wadden Sea. NAMMCOSP 2010. [DOI: 10.7557/3.2677] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
An index for the condition of a population should include a measure of the recuperative power or resilience of the population in question. This measure needs to cover both the demographic and physiological condition of the population. Applied to the harbour seal population in the Wadden Sea we therefore address respectively the population development and distribution, and its health condition, and relate these to environmental conditions. The harbour seal population has been severely depleted by hunting in the first half of the 20th century. After hunting was stopped in the mid-1970s the population recovered gradually. This recovery was twice interrupted by Phocine Distemper Virus (PDV) outbreaks in 1988 and 2002. These PDV-epizootics reduced the population by 57% and 50% respectively. They also lead to changes in age and sex structure of the population, which gradually returned to a stable age-structure. Despite the reduction in population size by respectively 57% and 50%, the population showed a strong recovery with a growth rate close to the considered maximum possible for this species. The observed changes in the distribution of the population over the 4 sub-regions indicate that distribution is not a static phenomenon. Long term field and pathological investigations point out that the general health status of the population has improved, particularly that of newborn seals (0-6months old). The increasing prevalence of parasites in lungs and intestine warrants continued monitoring of the health status of seals. This is especially relevant in view of the exponential increase of the population, which may finally approach the carrying capacity of the area. Concluding, we canstate that the condition of the population in terms of demographic and health parameters is satisfactory. The best guarantee for maintaining such a favourable conservation status is to abstain from human interferences (e.g. rescue, rehabilitation and release) with natural population processes. However, in practice there is increasing exploitation of marine waters. This requires a continuous monitoring of the potential impacts on the population, particularly of the effect on foraging and migratory behaviour.
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Geyer M, Borchardt T, Schreiyack C, Wietelmann A, Muller-Schrobsdorff F, Muller C, Muller-Ladner U, Dinser R. Endogenous regeneration after collagenase-induced knee joint damage in the adult newt Notophthalmus viridescens. Ann Rheum Dis 2010; 70:214-20. [DOI: 10.1136/ard.2009.126136] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [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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Geyer M, Borchardt T, Muller-Schrobsdorff F, Schreiyack C, Muller C, Wietelmann A, Fiehn C, Muller-Ladner U, Dinser R. Joint regeneration in newts? Yes, they can! Ann Rheum Dis 2010. [DOI: 10.1136/ard.2010.129593q] [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: 11/03/2022]
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Reisel D, Bannerman DM, Schmitt WB, Deacon RMJ, Flint J, Borchardt T, Seeburg PH, Rawlins JNP. Spatial memory dissociations in mice lacking GluR1. Nat Neurosci 2002; 5:868-73. [PMID: 12195431 DOI: 10.1038/nn910] [Citation(s) in RCA: 265] [Impact Index Per Article: 12.0] [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: 11/09/2022]
Abstract
Gene-targeted mice lacking the AMPA receptor subunit GluR1 (GluR-A) have deficits in hippocampal CA3-CA1 long-term potentiation. We now report that they showed normal spatial reference learning and memory, both on the hidden platform watermaze task and on an appetitively motivated Y-maze task. In contrast, they showed a specific spatial working memory impairment during tests of non-matching to place on both the Y-maze and an elevated T-maze. In addition, successful watermaze and Y-maze reference memory performance depended on hippocampal function in both wild-type and mutant mice; bilateral hippocampal lesions profoundly impaired performance on both tasks, to a similar extent in both groups. These results suggest that different forms of hippocampus-dependent spatial memory involve different aspects of neural processing within the hippocampus.
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Affiliation(s)
- D Reisel
- Department of Experimental Psychology, University of Oxford, South Parks Road, Oxford, OX1 3UD, UK
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Borchardt T, Schmidt C, Camarkis J, Cappai R, Masters CL, Beyreuther K, Multhaup G. Differential effects of zinc on amyloid precursor protein (APP) processing in copper-resistant variants of cultured Chinese hamster ovary cells. Cell Mol Biol (Noisy-le-grand) 2000; 46:785-95. [PMID: 10875440] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Previous studies have demonstrated that adding copper to Chinese-hamster ovary (CHO) cells greatly reduced the levels of beta-amyloid (Abeta) peptide in parental CHO-K1 and in copper resistant CHO-CUR3 cells which have lower intracellular copper levels. In the current study, zinc, the zinc chelator 1,10-phenanthroline or copper chelators bathocuproine and D-penicillamine were added to the culture media of stably transfected CHO cells. The data show that zinc up to concentrations of 50 microM or the presence of 1,10-phenanthroline specifically increased the level of secreted APP in CHO-K1 cells. By contrast, the level of secreted APP in CHO-CUR3 cells remained unaffected. APP holoprotein increased dramatically in CHO-CUR3 cells compared with CHO-K1 cells. The large decrease of Abeta release seen in both cell lines at elevated extracellular zinc levels was due to specific inhibition of secretion. These results indicate that a disturbed zinc-homeostasis may be an important factor influencing APP production, transport and processing.
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Affiliation(s)
- T Borchardt
- ZMBH-Center for Molecular Biology Heidelberg, University of Heidelberg, Germany
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Borchardt T, Camakaris J, Cappai R, Masters CL, Beyreuther K, Multhaup G. Copper inhibits beta-amyloid production and stimulates the non-amyloidogenic pathway of amyloid-precursor-protein secretion. Biochem J 1999; 344 Pt 2:461-7. [PMID: 10567229 PMCID: PMC1220664] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Previous studies have demonstrated that amyloid precursor protein (APP) can bind and reduce Cu(II) to Cu(I), leading to oxidative modification of APP. In the present study we show that adding copper to Chinese-hamster ovary (CHO) cells greatly reduced the levels of amyloid Abeta peptide (Abeta) both in parental CHO-K1 and in copper-resistant CHO-CUR3 cells, which have lower intracellular copper levels. Copper also caused an increase in the secretion of the APP ectodomain, indicating that the large decrease in Abeta release was not due to a general inhibition in protein secretion. There was an increase in intracellular full-length APP levels which paralleled the decrease in Abeta generation, suggesting the existence of two distinct regulating mechanisms, one acting on Abeta production and the other on APP synthesis. Maximal inhibition of Abeta production and stimulation of APP secretion was achieved in CHO-K1 cells at about 10 microM copper and in CHO-CUR3 cells at about 50 microM copper. This dose 'window of opportunity' at which copper promoted the non-amyloidogenic pathway of APP was confirmed by an increase in the non-amyloidogenic p3 fragment produced by alpha-secretase cleavage. Our findings suggest that copper or copper agonists might be useful tools to discover novel targets for anti-Alzheimer drugs and may prove beneficial for the prevention of Alzheimer's disease.
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Affiliation(s)
- T Borchardt
- ZMBH-Center for Molecular Biology Heidelberg, University of Heidelberg, Im Neuenheimer Feld 282, D-69120 Heidelberg, Germany
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Zamanillo D, Sprengel R, Hvalby O, Jensen V, Burnashev N, Rozov A, Kaiser KM, Köster HJ, Borchardt T, Worley P, Lübke J, Frotscher M, Kelly PH, Sommer B, Andersen P, Seeburg PH, Sakmann B. Importance of AMPA receptors for hippocampal synaptic plasticity but not for spatial learning. Science 1999; 284:1805-11. [PMID: 10364547 DOI: 10.1126/science.284.5421.1805] [Citation(s) in RCA: 611] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Gene-targeted mice lacking the L-alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate (AMPA) receptor subunit GluR-A exhibited normal development, life expectancy, and fine structure of neuronal dendrites and synapses. In hippocampal CA1 pyramidal neurons, GluR-A-/- mice showed a reduction in functional AMPA receptors, with the remaining receptors preferentially targeted to synapses. Thus, the CA1 soma-patch currents were strongly reduced, but glutamatergic synaptic currents were unaltered; and evoked dendritic and spinous Ca2+ transients, Ca2+-dependent gene activation, and hippocampal field potentials were as in the wild type. In adult GluR-A-/- mice, associative long-term potentiation (LTP) was absent in CA3 to CA1 synapses, but spatial learning in the water maze was not impaired. The results suggest that CA1 hippocampal LTP is controlled by the number or subunit composition of AMPA receptors and show a dichotomy between LTP in CA1 and acquisition of spatial memory.
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Affiliation(s)
- D Zamanillo
- Department of Molecular Neuroscience, Max-Planck Institute for Medical Research, Jahnstrasse 29, 69120 Heidelberg, Germany
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Multhaup G, Hesse L, Borchardt T, Ruppert T, Cappai R, Masters CL, Beyreuther K. Autoxidation of amyloid precursor protein and formation of reactive oxygen species. Adv Exp Med Biol 1999; 448:183-92. [PMID: 10079826 DOI: 10.1007/978-1-4615-4859-1_16] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Affiliation(s)
- G Multhaup
- ZMBH-Center for Molecular Biology Heidelberg, University of Heidelberg, Germany.
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Smith J, MacNamara E, Raftery D, Borchardt T, Byrn S. Application of Two-Dimensional 13C Solid-State NMR to the Study of Conformational Polymorphism. J Am Chem Soc 1998. [DOI: 10.1021/ja980952t] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jay Smith
- Contribution from the H. C. Brown Laboratory, Department of Chemistry, and Departments of Industrial and Physical Pharmacy and Medicinal Chemistry, Purdue University, West Lafayette, Indiana 47907
| | - Ernesto MacNamara
- Contribution from the H. C. Brown Laboratory, Department of Chemistry, and Departments of Industrial and Physical Pharmacy and Medicinal Chemistry, Purdue University, West Lafayette, Indiana 47907
| | - Daniel Raftery
- Contribution from the H. C. Brown Laboratory, Department of Chemistry, and Departments of Industrial and Physical Pharmacy and Medicinal Chemistry, Purdue University, West Lafayette, Indiana 47907
| | - Thomas Borchardt
- Contribution from the H. C. Brown Laboratory, Department of Chemistry, and Departments of Industrial and Physical Pharmacy and Medicinal Chemistry, Purdue University, West Lafayette, Indiana 47907
| | - Stephen Byrn
- Contribution from the H. C. Brown Laboratory, Department of Chemistry, and Departments of Industrial and Physical Pharmacy and Medicinal Chemistry, Purdue University, West Lafayette, Indiana 47907
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