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Hertling S, Lehle K, Süsskind-Schwendi MV, Ried M, Hofmann HS. Vasomodulierende Rezeptoren an humanen Pulmonalgefäßen – eine immunhistochemische Untersuchung. Zentralbl Chir 2016. [DOI: 10.1055/s-0036-1587529] [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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Hertling S, Lehle K, Ried M, Hofmann HS, Süsskind-Schwendi MV. Sind Pulmonalvenen den Pulmonalarterien gleichzustellen? Eine histologische Untersuchung. Zentralbl Chir 2016. [DOI: 10.1055/s-0036-1587520] [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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Süsskind MV, Keil L, Schaub AL, Schmid C, Hirt SW, Lehle K. Eine Kombination aus Rezeptor-Tyrosin-Kinase-Inhibitoren und Everolimus reduziert das chronische Transplantatversagen nach experimenteller Lungentransplantation. Zentralbl Chir 2016. [DOI: 10.1055/s-0036-1587530] [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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von Suesskind-Schwendi M, Heigel E, Pfaehler S, Haneya A, Schmid C, Hirt SW, Lehle K. Protective function of pirfenidone and everolimus on the development of chronic allograft rejection after experimental lung transplantation. Histol Histopathol 2015; 31:793-805. [PMID: 26707547 DOI: 10.14670/hh-11-712] [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: 11/30/2022]
Abstract
Long-term survival of lung allografts is limited by chronic rejection (CR). Oxidative stress (OxS) plays a central role in the development of CR. We investigated the influence of pirfenidone (alone or in combination with everolimus) on OxS and CR. A rat model of left lung allo-transplantation (F344-to-WKY) was used to evaluate the effects of pirfenidone alone [0,85% in chow from postoperative day (POD) -3 to 20/60] and in combination with everolimus [2,5 mg/kg bw daily from POD 7 to 20/60]. Allografts of non-treated animals, everolimus treated animals and right, non-transplanted lungs were used as references. Immunohistology of myeloperoxidase (MPO), haemoxygenase-1 (HO-1), iron and platelet-derived-growth-factor-receptor-alpha (PDGFR-a) were performed. On POD 20, all groups showed severe acute rejection (ISHLT A3-4/B1R-B2R). Groups treated with pirfenidone showed a lower interstitial inflammatory infiltration and a lower participation of highly fibrotic degenerated vessels (ISHLT-D2R). In the long term follow up (POD 60), pirfenidone alone significantly reduced chronic airway rejection (ISHLT-C; p≤0.05), interstitial fibrosis (IF; p≤0.05), content of collagen (p≤0.05), expression of PDGFR-a (p≤0.05) and the deposition of iron (p≤0.05). All groups treated with pirfenidone showed a high expression of the cytoprotective enzyme HO-1 (p≤0.05). The additional application of everolimus resulted in a significant decrease of chronic airway rejection (ISHLT-C; p≤0.05), vasculopathy (ISHLT; p≤0.05) and IF (p≤0.05). In conclusion, early application of pirfenidone inhibited the progression of CR by its anti-fibrotic and anti-oxidative properties. The additional application of an m-TOR-inhibitor increased the anti-fibrotic effects of pirfenidone which resulted in a reduction of CR after experimental LTx.
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Affiliation(s)
| | - E Heigel
- Institute of Pathology, University Medical Center, Regensburg, Germany
| | - S Pfaehler
- Institute of Pathology, University Medical Center, Regensburg, Germany
| | - A Haneya
- Department of Immunology, University Hospital of Schleswig-Holstein, Campus Kiel, Kiel, Germany
| | - C Schmid
- Department of Cardiothoracic Surgery, University Medical Center, Regensburg, Germany
| | - S W Hirt
- Department of Cardiothoracic Surgery, University Medical Center, Regensburg, Germany
| | - K Lehle
- Department of Cardiothoracic Surgery, University Medical Center, Regensburg, Germany
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von Suesskind M, Keil L, Schmid C, Hirt S, Lehle K. Combination Therapy Using Imatinib and Vatalanib Improves the Long-Term Outcome After Rat Lung Transplantation. J Heart Lung Transplant 2015. [DOI: 10.1016/j.healun.2015.01.738] [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: 11/30/2022] Open
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von Suesskind-Schwendi M, Valenti V, Haneya A, Pühler T, Bewig B, Schmid C, Hirt SW, Lehle K. Synergism of imatinib mesylate and everolimus in attenuation of bronchiolitis obliterans after rat LTX. Histol Histopathol 2013; 28:1273-84. [PMID: 23471704 DOI: 10.14670/hh-28.1273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Bronchiolitis obliterans (BO) is a progressive and fatal disease after lung transplantation (LTX). Dysregulated growth factor-induced proliferation of myofibroblasts seems to be responsible for the development of BO. The aim was to confirm the efficacy of both inhibitors of receptor tyrosine kinases (RTKI) and of mammalian target of rapamycin (mTORI) after rat LTX. We used a rat model of left lung allo-transplantation (F344-to-WKY) to evaluate the effect of imatinib (RTKI; 20 mg/kg/day; postoperative day (POD) 0-100) alone or in combination with everolimus (mTORI; 2.5 mg/kg/day; POD 14-100). Non-treated animals were the reference. In non-treated rats, acute rejection (AR) peaked between POD 20 and 30 (19/19) and ended in chronic rejection (CR) on POD 60/100 (12/12). Imatinib alone did not prevent AR (6/6), but attenuated the degree of degenerated bronchioles on POD 30 (non-treated, 57%; imatinib, 4%), and increased the allografts free of CR on POD 60/100 (3/12). A combination of imatinib and everolimus significantly reduced AR, attenuated fibrotic degenerated bronchioles (5%) and vessels (non-treated, 24%; combination therapy, 11%) on POD 30, and reduced fibrotic degenerated vessels (non-treated, 97%; combination therapy, 43%) and bronchioles (non-treated, 88%; combination therapy, 34%) on POD 60/100. Fifty percent of the animals were completely free of BO and vasculopathy. In conclusion, co-application of RTKI and mTORI attenuated the development of BO and vasculopathy. Thus, imatinib might be an interesting therapeutic approach after LTX.
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Camboni D, Philipp A, Dornia C, Lehle K, Flörchinger B, Schreyer A, Hilker M, Schmid C. Evaluation of clots in oxygenators on running ECMO-systems and after exchange. Thorac Cardiovasc Surg 2013. [DOI: 10.1055/s-0032-1332264] [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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Lehle K, von Suesskind-Schwendi M, Diez C, Michl M, Geissler EK, Wottge HU, Schmid C, Hirt SW. Relevance of maintenance triple-drug immunosuppression to bridle the amplification of rat cytomegalovirus infection after experimental lung transplantation. Transpl Infect Dis 2012; 14:649-56. [PMID: 22676701 DOI: 10.1111/j.1399-3062.2012.00751.x] [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] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Revised: 12/28/2011] [Accepted: 01/21/2012] [Indexed: 11/30/2022]
Abstract
Immunosuppressive therapy required to treat rejection after lung transplantation (LTx) contributes significantly to the pathogenesis of cytomegalovirus (CMV) infection and disease. In a weak allogeneic left LTx model in the rat (Fisher 344 [F344] to Wistar Kyoto [WKY] rats) we analyzed the influence of acute CMV infection on postoperative day (POD) 3, with application of standard triple-drug immunosuppression (TD-IS) (cyclosporin A, azathioprine, prednisolone) on late outcome after LTx. Native right lungs and syngeneic grafts (WKY to WKY) served as controls. Rats were sacrificed on POD 15, 30, 60, and 100. TD-IS completely prevented acute and chronic rejection in non-infected rats. Allografts of CMV-infected rats treated with TD-IS showed only mild perivascular infiltrations in 6/10 rats (POD 15 and 30), which persisted up to POD 100 in 4/10 rats. In the long-term course, mild isolated interstitial and alveolar changes were found in 40% of these animals. In conclusion, rat CMV infection partially neutralized the immunosuppressive effect of TD-IS. However, an amplification of CMV infection under TD-IS can be controlled and does not result in fatal outcome.
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Affiliation(s)
- K Lehle
- Department of Cardiothoracic Surgery, University Hospital Regensburg, University of Regensburg, Regensburg, Germany.
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von Suesskind-Schwendi M, Hirt SW, Diez C, Ruemmele P, Puehler T, Schmid C, Lehle K. Impact of the severity of acute rejection in the early phase after rat lung transplantation on the effectiveness of mycophenolate mofetil to treat chronic allograft rejection. Eur J Cardiothorac Surg 2012; 42:142-8. [DOI: 10.1093/ejcts/ezr277] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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von Süßkind-Schwendi M, Ruemmele P, Schmid C, Hirt SW, Lehle K. Lung transplantation in the fischer 344–wistar kyoto strain combination is a relevant experimental model to study the development of bronchiolitis obliterans in the rat. Exp Lung Res 2012; 38:111-23. [DOI: 10.3109/01902148.2012.656820] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Süsskind-Schwendi MV, Valenti V, Pühler T, Schmid C, Hirt SW, Lehle K. Co-application of imatinib and everolimus attenuates the appearance of bronchiolitis obliterans after LTX in a rat model. Thorac Cardiovasc Surg 2012. [DOI: 10.1055/s-0031-1297783] [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: 10/14/2022]
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Wehner D, Stadtherr K, Beckenlehner-Lukas K, Gessner A, Schmid C, Schmid T, Lehle K. Biocompatible polyurethane coating for use in pulsatile ventricular asist dvices. Thorac Cardiovasc Surg 2012. [DOI: 10.1055/s-0031-1297833] [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: 10/14/2022]
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Wilm J, Philipp A, Mueller T, Lehle K, Schmid C. Typing of cellular deposits on oxygenator membranes after extracorporeal membrane oxygenation for acute lung failure. Thorac Cardiovasc Surg 2012. [DOI: 10.1055/s-0031-1297730] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Suesskind-Schwendi M, Ruemmele P, Wottge HU, Puehler T, Schmid C, Hirt S, Lehle K. 260 Imatinib Mesylate Prevents Bronchiolitis Obliterans after LTX in a Rat Model. J Heart Lung Transplant 2011. [DOI: 10.1016/j.healun.2011.01.267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Wimmer A, Schmid T, Vodermayer B, Gmeiner H, Kunz A, Lehle K, Schmid C, Welz A, Hirzinger G, Schiller W, Wintermantel E. Implantable biventricular assist device for destination therapy. Thorac Cardiovasc Surg 2011. [DOI: 10.1055/s-0030-1269172] [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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Haneya A, Philipp A, Puehler T, Diez C, Ried M, Hirt S, Rupprecht L, Zausig Y, Schmid C, Lehle K. Minimized versus conventional cardiopulmonary bypass: outcome of diabetic patients after coronary artery bypass grafting. Thorac Cardiovasc Surg 2011. [DOI: 10.1055/s-0030-1269094] [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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Puehler T, Haneya A, Philipp A, Camboni D, Hirt S, Zink W, Lehle K, Rupprecht L, Kobuch R, Diez C, Schmid C. Minimized extracorporeal circulation in coronary artery bypass surgery is equivalent to standard extracorporeal circulation in patients with reduced left ventricular function. Thorac Cardiovasc Surg 2010; 58:204-9. [PMID: 20514574 DOI: 10.1055/s-0029-1241028] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND Minimized extracorporeal circulation (MECC) is a promising alternative to standard extracorporeal circulation (ECC) and its use is increasing in routine coronary bypass surgery. We analyzed the clinical outcome of patients with reduced left ventricular function who underwent coronary artery bypass surgery with MECC or with standard ECC. METHODS From January 2003 to September 2008, 238 patients with a left ventricular function < 30 % underwent bypass surgery with ECC or MECC. The primary end point of our retrospective observational study was 30-day mortality. Secondary endpoints were the transfusion requirements, as well as intensive care and the in-hospital course. RESULTS Demographic data, comorbidities and left ventricular function were similar in the study groups. MECC patients had a tendency towards a lower 30-day mortality rate, a better postoperative renal function and reduced ventilation times. Extracorporeal circulation time and postoperative high-dose inotropic support were significantly lower in the MECC group, while the stays in the intensive care unit and in hospital were comparable between the two groups. In our study, age in the ECC group, and previous infarction and New York Heart Association grade IV in the MECC group were preoperative risk factors associated with a higher mortality. CONCLUSION Coronary bypass surgery using MECC is feasible and safe for patients with severely impaired left ventricular function. It is a promising alternative to ECC with a low mortality rate and a more favorable postoperative course.
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Affiliation(s)
- T Puehler
- Department of Cardiothoracic Surgery, Medical Center University Regensburg, Regensburg, Germany.
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Riescher S, Schopka S, Grzeski M, Schmid T, Girndt B, Schmid C, Lehle K. Biofunctionalization of ventricular assist devices. Thorac Cardiovasc Surg 2010. [DOI: 10.1055/s-0029-1247009] [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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Lehle K, Philipp A, Wilm J, Mueller T, Lubnow M, Schmid C. Assessment of risk of circuit infection in patients with severe acute respiratory distress syndrome on extracorporeal life support. Thorac Cardiovasc Surg 2010. [DOI: 10.1055/s-0029-1246900] [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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Suesskind-Schwendi MV, Brunner E, Lehle K, Puehler T, Schmid C, Hirt S. Everolimus in the treatment of chronic lung rejection. Thorac Cardiovasc Surg 2010. [DOI: 10.1055/s-0029-1247074] [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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Puehler T, Rupprecht L, Hirt S, Schmid C, Lehle K. Improvement of human endothelial cell function during organ preservation by normothermic HTK perfusion and protein supplementation. Thorac Cardiovasc Surg 2010. [DOI: 10.1055/s-0029-1247010] [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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Haneya A, Philipp A, Diez C, Ried M, Puehler T, Camboni D, Lehle K, Schmid C. Comparison of two different minimized extracorporeal circulation systems: hematological effects after coronary surgery. Thorac Cardiovasc Surg 2010. [DOI: 10.1055/s-0029-1247095] [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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Lehle K, Kirchner GI, Rupprecht L, Gruber M, Birnbaum DE, Schmid FX, Preuner JG. A prospective cross-over study comparing the pharmacokinetics of cyclosporine A and its metabolites after oral versus short-time intravenous cyclosporine A administration in pre-heart transplant patients. Transplant Proc 2008; 39:3323-8. [PMID: 18089380 DOI: 10.1016/j.transproceed.2007.09.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2007] [Revised: 08/22/2007] [Accepted: 09/13/2007] [Indexed: 11/25/2022]
Abstract
Sometimes intravenous administration of cyclosporine (CsA) is essential before oral administration is possible. There are only a few reports available on the interindividual variability of CsA metabolism and different metabolite pattern depending on intravenous versus oral administration of CsA in heart transplant (HTx) patients. For effective inhibition of calcineurin we used a short infusion reaching peak concentrations after 2 hours. In a prospective cross-over study we compared the pharmacokinetics of CsA and its metabolites after oral (2.0 mg/kg body weight) versus intravenous (0.7 mg/kg body weight; 2-hour infusion) CsA administration (single test dose) in 7 pre-HTx patients. The pharmacokinetic parameters of CsA and its metabolites were analyzed using high-pressure liquid chromatography. The pharmacokinetic parameter area under the concentration time curve (AUC(0-infinity)) of CsA after intravenous administration was significantly lower (2903 ng*h*mL(-1)) than that after oral administration (4344 ng*h*mL(-1); P=.01). Peak concentrations, time to peak concentration, and terminal elimination half life were not significantly different. Short-time infusion of CsA resulted in a significant decrease in the AUC of the metabolites AM1 (3-fold), AM9 (10-fold), and AM1c (3-fold). A 2-hour infusion of CsA is just as effective as oral administration and the reduced amount of metabolites is advantageous for the patient.
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Affiliation(s)
- K Lehle
- Clinic of Cardiothoracic Surgery, University of Regensburg, Regensburg, Germany.
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Schmid C, Philipp A, Hirt S, Flörchinger B, Klose A, Mueller T, Lehle K, Schmid FX, Birnbaum D, Hilker M. 472: Recovery of Pulmonary Function with Pumpless Extracorporeal Lung Assist (PECLA). J Heart Lung Transplant 2008. [DOI: 10.1016/j.healun.2007.11.485] [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] Open
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Hoenicka M, Lehle K, Jacobs VR, Dendorfer S, Kostorz A, Schmid FX, Birnbaum DE. Mechanical and seeding properties of human umbilical vein – a potential scaffold for a tissue-engineered vessel graft. Thorac Cardiovasc Surg 2007. [DOI: 10.1055/s-2007-967592] [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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Hoenicka M, Lehle K, Jacobs VR, Rupprecht L, Göbölös L, Schmid FX, Birnbaum DE. Effect of cryopreservation on viability and function of human umbilical vein – a potential scaffold for a tissue-engineered vessel graft. Thorac Cardiovasc Surg 2006. [DOI: 10.1055/s-2006-925786] [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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Jacobs VR, Niemeyer M, Gottschalk N, Schneider KTM, Kiechle M, Oostendorp RAJ, Peschel C, Hönicka M, Lehle K, Birnbaum D, Meyer TPH, Rapp S, Burkhart J, Aigner J, Eblenkamp M, Wintermantel E. Das STEMMAT-Projekt als Teil der Gesundheitsinitiative BayernAktiv: Adulte Stammzellen aus Nabelschnur und -blut als Alternative zur embryonalen Stammzellforschung. ACTA ACUST UNITED AC 2006; 127:368-72. [PMID: 16341979 DOI: 10.1055/s-2005-836498] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [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: 10/25/2022]
Abstract
Adult stem cells from umbilical cord and cord blood are an interesting alternative to embryonic stem cells because such research is commonly recognized as ethical undisputed and many aspects are still insufficiently investigated. In the context of the STEMMAT research project (STEM = Stem Cell and MAT = Material) different aspects of stem cells from umbilical cord and cord blood are investigated, to improve basic science understanding and potentially leading someday to a clinical application.
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Affiliation(s)
- V R Jacobs
- Frauenklinik, Klinikum Rechts der Isar, Technische Universität München.
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Haubner F, Lehle K, Münzel D, Birnbaum DE, Preuner JG. Effekt einer erhöhten Glukosekonzentration auf Proliferation und Inflammation in unterschiedlichen Endothelzellmodellen. DIABETOL STOFFWECHS 2006. [DOI: 10.1055/s-2006-944034] [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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Münzel D, Lehle K, Haubner F, Birnbaum DE, Preuner JG. Wirkung von Serum diabetischer Patienten auf humane Endothelzellen der Vena saphena (HSVEC). DIABETOL STOFFWECHS 2006. [DOI: 10.1055/s-2006-943870] [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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Lehle K, Haubner F, Münzel D, Birnbaum DE, Preuner JG. Entwicklung eines patienten-spezifischen Zellmodells der Endothelialen Dysfunktion bei Patienten mit nicht-insulinabhängigem Diabetes mellitus (NIDDM). DIABETOL STOFFWECHS 2006. [DOI: 10.1055/s-2006-943871] [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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Birnbaum D, Lehle K, Schmid F, Preuner J. Effects of immunosuppressants (calcineurin-antagonists and m-TOR-inhibitors) on endothelial cell signals and replication. J Heart Lung Transplant 2005. [DOI: 10.1016/j.healun.2004.12.015] [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: 11/25/2022] Open
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Lehle K, Birnbaum DE, Preuner JG. Predominant inhibition of interleukin-6 synthesis in patient-specific endothelial cells by mTOR inhibitors below a concentration range where cell proliferation is affected and mitotic arrest takes place. Transplant Proc 2005; 37:159-61. [PMID: 15808580 DOI: 10.1016/j.transproceed.2004.12.140] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
UNLABELLED Organ rejection and inflammation are accompanied by endothelial cell activation. An in vitro model with patient-specific endothelial cells was used to study the impact of mTOR inhibitors on cell growth and release of proinflammatory cytokines. MATERIAL AND METHODS Confluent monolayers of human saphenous vein endothelial cells were pretreated with everolimus or sirolimus followed by induction with tumour necrosis factor-alpha (TNF-alpha). RESULTS Incubation with sirolimus or everolimus resulted in a dose-dependent deceleration of cell growth. Compared to control, cell count at high concentrations ceased to increase and remained at 60%. This mitotic arrest was accompanied by a dose-dependent inhibition of the TNF-alpha-induced in situ synthesis and release of interleukin-6 per cell by 60%. CONCLUSIONS Under conditions mimicking cytokine-induced cell activation a predominant inhibitory effect of everolimus compared to sirolimus on endothelial cell proliferation was observed paralleled by an inhibition of proinflammatory cytokines. This might attenuate the acute proinflammatory status after transplantation.
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Affiliation(s)
- K Lehle
- Clinic of Cardiothoracic Surgery, University of Regensburg, Regensburg, Germany.
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Lehle K, Kunz-Schughart LA, Birnbaum DE, Preuner JG. DETECTION OF ANTI-ENDOTHELIAL CELL ANTIBODIES IN PATIENTS AFTER HEART TRANSPLANTATION AND THEIR RELATION TO ENDOTHELIAL CELL ACTIVATION. Transplantation 2004. [DOI: 10.1097/00007890-200407271-02010] [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: 11/25/2022]
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Jacobs VR, Schneider KTM, Kiechle M, Oostendorp RAJ, Peschel C, Lehle K, Hönicka M, Birnbaum D, Meyer T, Rapp S, Burkhart J, Aigner J, Wintermantel E. Das STEMMAT-Projekt: Grundlagenforschung mit adulten Stammzellen aus Nabelschnur und -blut. Geburtshilfe Frauenheilkd 2003. [DOI: 10.1055/s-2003-815147] [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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Preuner JG, Lehle K, Keyser A, Merk J, Rupprecht L, Goebels R. Development of severe adverse effects after discontinuing amiodarone therapy in human heart transplant recipients. Transplant Proc 1998; 30:3943-4. [PMID: 9865253 DOI: 10.1016/s0041-1345(98)01296-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J G Preuner
- Clinic for Cardio-Thoracic Surgery, University of Regensburg, Germany.
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Affiliation(s)
- K Lehle
- Clinic of Cardiothoracic Surgery, University of Regensburg, Germany
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Affiliation(s)
- J G Preuner
- Clinic for Cardiothoracic Surgery, University of Regensburg, Germany
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Minuth T, Krämer B, Lehle K, Jaenicke R, Kohnert U. The spectroscopic analysis, inhibition and binding studies demonstrate the equivalence of Erythrina caffra trypsin inhibitor and the recombinant substitution variant recSerETI. J Biotechnol 1998; 62:231-9. [PMID: 9729806 DOI: 10.1016/s0168-1656(98)00066-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A recombinant substitution mutant (recSerETI) of the Erythrina caffra trypsin inhibitor, with the N-terminal valine residue substituted by serine, was produced in E. coli and compared to the wildtype protein (wtETI) with respect to physicochemical and functional properties. The spectral properties, including UV absorbance, fluorescence emission and circular dichroism, were indistinguishable. Furthermore, the inhibitory activities of the two proteins regarding the inhibition of trypsin, chymotrypsin, tissue plasmininogen activator (t-PA) and reteplase (BM 06.022, t-PA deletion variant comprising the kringle 2 and the protease domains, isolated from transformed E. coli cells) and the affinity of the immobilized inhibitors for reteplase were closely similar. Five repetitive cycles of guanidinium chloride (GdmCl)-induced denaturation-renaturation yield the native mutant protein with its inhibitory activity fully restored. The only difference between the wildtype and the mutant protein refers to the intrinsic stability. Comparing the pH- and GdmCl-dependent transitions, as well as the thermal denaturation, recSerETI exhibits decreased stability compared to the wildtype protein. The pH range of stability is shifted from pH 1-9.5, for wtETI, to pH 2-9, for recSerETI; similarly the GdmCl-induced denaturation is found to occur at a GdmCl half concentration of 3.7 M instead of 4.5 M; in both cases the renaturation exhibits strong hysteresis. The mid-point of the thermal unfolding transition of the mutant protein is at approximately 65 degrees C, as compared to approximately 75 degrees C for the wildtype protein.
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Affiliation(s)
- T Minuth
- Institut für Biophysik und physikalische Biochemie, Universität Regensburg, Germany
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Lehle K, Kohnert U, Stern A, Popp F, Jaenicke R. Effect of disulfide bonds on the structure, function, and stability of the trypsin/tPA inhibitor from Erythrina caffra: site-directed mutagenesis, expression, and physiochemical characterization. Nat Biotechnol 1996; 14:476-80. [PMID: 9630923 DOI: 10.1038/nbt0496-476] [Citation(s) in RCA: 23] [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: 02/07/2023]
Abstract
Erythrina trypsin/tPA inhibitor (ETI) from the seeds of Erythrina caffra retains its native structure and inhibitory function after reducing its two disulfide bonds. In order to elucidate the specific role of these crosslinks, alanine residues were substituted for cysteines after cloning the gene in Escherichia coli. Expression of the recombinant inhibitor and the substitution mutants, C83A, CC39, 83AA, and CC132, 139AA, led to inclusion bodies. After solubilization in guanidinium-chloride (GdmCl)/dithiothreitol and oxidation in glutathione buffer, activity could be recovered at yields up to 80%. The mutant proteins exhibit full inhibitory function without detectable alterations of their native structure. However, their stability is reduced: at acid pH, where the oxidized natural inhibitor retains its native structure, the reduced wildtype protein and the mutants undergo at least partial denaturation, reflected by decreased pH ranges of stability: pH 5-7 for the reduced inhibitor, pH 2.5-8.5 for CC132, 139AA, and pH 3.5-8.5 for C83A and CC39, 83AA. Urea and GdmCl denaturation at pH 7 show hysteresis for both the oxidized inhibitor and the double mutant CC132, 139AA. In contrast, the reduced protein and the other mutants exhibit true equilibrium transitions at pH 7, with urea half-concentrations of 0.9 M and 1.9 M and GdmCl half-concentrations of 0.5 M and 1.0 M, respectively. The stability of Erythrina trypsin/tPA inhibitor follows the sequence: oxidized ETI > CC132, 139AA > CC39, 83AA and C83A > reduced ETI.
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Affiliation(s)
- K Lehle
- Institut für Biophysik und Physikalische Biochemie, Universität Regensburg, Germany
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Abstract
Erythrina trypsin inhibitor (ETI) from the seeds of Erythrina caffra is a high-affinity inhibitor of trypsin, chymotrypsin and tissue plasminogen activator. Its 172 amino acid polypeptide chain is stabilized in its compact, native state by two disulfide bonds. In spite of their conservation in all trypsin inhibitors of the soybean trypsin inhibitor (STI-Kunitz) family, their state of oxidation is essential only for protein stability but not for inhibitory function. Reduction/reoxidation of ETI in the presence of glutathione reshuffling buffer (GSH/GSSG; pH 8.3) not only allows the inhibitor to be restored in its native structure, but also does not interfere with its binding affinity; carboxymethylation or carboxamidomethylation of the free thiol groups does not affect K1 significantly (for trypsin (KI)ETIox = 2.3 nM, (KI)ETICM = 1.9 nM; for chymotrypsin (KI)ETIox = 30 microM, (KI)ETICM = 25 microM). The two cystine cross-bridges in the native ETI lead to enhanced stability toward pH and chaotropic agents. As taken from intrinsic protein fluorescence at acid pH and varying ionic strength (pH < 4, I = 0.01 to 0.15 M), the oxidized inhibitor retains its spectral properties, whereas reduced and carboxymethylated or carboxamidomethylated ETI undergo at least partial denaturation. At alkaline pH, the oxidized protein is stable up to pH 9.5, whereas the reduced protein undergoes structural alterations at pH > 7, reaching a final plateau at pH 10.0 to 10.5. In the case of urea (U) or guanidinium chloride (GdmCl) denaturation at pH 7.0, structural transitions of the oxidized inhibitor show "hysteresis" with half-concentrations (cU)1/2 approximately 10 M and (cGdmCl)1/2 approximately 4.5 M for denaturation, and (cU)1/2 = 4.7 M and (cGdmCl)1/2 = 1.5 M for renaturation. In contrast, the reduced (and chemically modified) inhibitors exhibit true equilibrium transitions at (cU)1/2 = 0.9 M and (cGdmCl)1/2 = 0.5 M, respectively. Reduction/reoxidation in the absence and in the presence of denaturants (GdmCl) can also be applied to ETI covalently attached to a solid matrix.
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Affiliation(s)
- K Lehle
- Institut für Biophysik und Physikalische Biochemie Universität Regensburg, Germany
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Gross M, Lehle K, Jaenicke R, Nierhaus KH. Pressure-induced dissociation of ribosomes and elongation cycle intermediates. Stabilizing conditions and identification of the most sensitive functional state. Eur J Biochem 1993; 218:463-8. [PMID: 8269935 DOI: 10.1111/j.1432-1033.1993.tb18397.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Pressure-induced dissociation of ribosomes has been considered a major reason for the inhibition of protein biosynthesis and, hence, bacterial growth at high hydrostatic pressure [Jaenicke, R. (1981) Annu. Rev. Biophys. Bioeng. 10, 1-67]. We reexamined the issue, using a buffer system with polyamines that has been optimized to reproduce in-vivo-like performance of protein biosynthesis in vitro. By slightly modifying this buffer, we were able to find conditions that stabilize functional ribosomal complexes against the dissociating effect of pressure up to 100 MPa and uncharged tight couples up to 60 MPa. Approaching the physiological conditions by reducing the Mg2+ concentration down to 4 mM, one finds a significant destabilization of the post-translocational complex, which represents the most pressure-sensitive intermediate of the elongation cycle and is possibly the limiting factor for the pressure-induced block of protein biosynthesis and bacterial growth.
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Affiliation(s)
- M Gross
- Institut für Biophysik und physikalische Biochemie, Universität Regensburg, Germany
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Eppendorfer S, König S, Golbik R, Neef H, Lehle K, Jaenicke R, Schellenberger A, Hübner G. Effects of metal ions, thiamine diphosphate analogues and subunit interactions on the reconstitution behaviour of pyruvate decarboxylase from brewer's yeast. Biol Chem Hoppe Seyler 1993; 374:1129-34. [PMID: 8129859 DOI: 10.1515/bchm3.1993.374.7-12.1129] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The reconstitution of pyruvate decarboxylase starts with reversible binding of thiamine diphosphate and Mg2(+)-ions to the apoenzyme, followed by a rate-limiting conformational change to the catalytically active holoenzyme. Investigations with diphospho-esters of 4-methyl-5-(2-hydroxyethyl)thiazolium derivatives have shown that the diphosphate residue of thiamine diphosphate is the most important part of the coenzyme responsible for the first reversible binding step. Methylation of the N1'-atom of the pyrimidine ring of thiamine diphosphate or 4'-oxythiamine diphosphate prevents the coenzyme from binding stably to the apoenzyme, so that the methylated coenzyme displays no coenzyme activity. In contrast, thiamine diphosphate analogues with bulky residues on the neighbouring C2'-atom of the pyrimidine ring form active holoenzyme complexes. This result shows the essential role of the N1'-atom of thiamine diphosphate in stable cofactor binding. The cofactor binding rate to the dimeric and tetrameric apoenzymes indicates that the cofactor is located in the contact regions of the subunits in the tetrameric enzyme.
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Affiliation(s)
- S Eppendorfer
- Fachbereich Biochemie/Biotechnologie, Institut für Biochemie, Martin-Luther-Universität Halle-Wittenberg
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