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Schueler J, Kuenzel J, Thuesing A, Pion E, Behncke RY, Haegerling R, Fuchs D, Kraus A, Buchholz B, Huang B, Merhof D, Werner JM, Schmidt KM, Hackl C, Aung T, Haerteis S. Ultra high frequency ultrasound enables real-time visualization of blood supply from chorioallantoic membrane to human autosomal dominant polycystic kidney tissue. Sci Rep 2024; 14:10063. [PMID: 38698187 PMCID: PMC11066115 DOI: 10.1038/s41598-024-60783-3] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Accepted: 04/26/2024] [Indexed: 05/05/2024] Open
Abstract
Ultra high frequency (UHF) ultrasound enables the visualization of very small structures that cannot be detected by conventional ultrasound. The utilization of UHF imaging as a new imaging technique for the 3D-in-vivo chorioallantoic membrane (CAM) model can facilitate new insights into tissue perfusion and survival. Therefore, human renal cystic tissue was grafted onto the CAM and examined using UHF ultrasound imaging. Due to the unprecedented resolution of UHF ultrasound, it was possible to visualize microvessels, their development, and the formation of anastomoses. This enabled the observation of anastomoses between human and chicken vessels only 12 h after transplantation. These observations were validated by 3D reconstructions from a light sheet microscopy image stack, indocyanine green angiography, and histological analysis. Contrary to the assumption that the nutrient supply of the human cystic tissue and the gas exchange happens through diffusion from CAM vessels, this study shows that the vasculature of the human cystic tissue is directly connected to the blood vessels of the CAM and perfusion is established within a short period. Therefore, this in-vivo model combined with UHF imaging appears to be the ideal platform for studying the effects of intravenously applied therapeutics to inhibit renal cyst growth.
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Affiliation(s)
- Jan Schueler
- Institute for Molecular and Cellular Anatomy, University of Regensburg, 93053, Regensburg, Germany
| | - Jonas Kuenzel
- Institute for Molecular and Cellular Anatomy, University of Regensburg, 93053, Regensburg, Germany
| | - Anna Thuesing
- Institute for Molecular and Cellular Anatomy, University of Regensburg, 93053, Regensburg, Germany
| | - Eric Pion
- Institute for Molecular and Cellular Anatomy, University of Regensburg, 93053, Regensburg, Germany
| | - Rose Yinghan Behncke
- Research Group 'Lymphovascular Medicine and Translational 3D-Histopathology', Institute of Medical and Human Genetics, Charité-Universitätsmedizin Berlin, 13353, Berlin, Germany
- Berlin Institute of Health at Charité-Universitätsmedizin Berlin, BIH Center for Regenerative Therapies, 13353, Berlin, Germany
| | - Rene Haegerling
- Research Group 'Lymphovascular Medicine and Translational 3D-Histopathology', Institute of Medical and Human Genetics, Charité-Universitätsmedizin Berlin, 13353, Berlin, Germany
- Berlin Institute of Health at Charité-Universitätsmedizin Berlin, BIH Center for Regenerative Therapies, 13353, Berlin, Germany
- Research Group 'Development and Disease', Max Planck Institute for Molecular Genetics, 14195, Berlin, Germany
- Berlin Institute of Health at Charité-Universitätsmedizin Berlin, BIH Academy, Clinician Scientist Program, 10117, Berlin, Germany
| | - Dieter Fuchs
- FUJIFILM VisualSonics, Inc., 1114 AB, Amsterdam, The Netherlands
| | - Andre Kraus
- Department of Nephrology and Hypertension, Friedrich-Alexander University Erlangen-Nürnberg, 91054, Erlangen, Germany
| | - Bjoern Buchholz
- Department of Nephrology and Hypertension, Friedrich-Alexander University Erlangen-Nürnberg, 91054, Erlangen, Germany
| | - Boqiang Huang
- Institute of Image Analysis and Computer Vision, Faculty of Informatics and Data Science, University of Regensburg, 93053, Regensburg, Germany
| | - Dorit Merhof
- Institute of Image Analysis and Computer Vision, Faculty of Informatics and Data Science, University of Regensburg, 93053, Regensburg, Germany
| | - Jens M Werner
- Department of Surgery, University Hospital Regensburg, 93053, Regensburg, Germany
| | - Katharina M Schmidt
- Department of Surgery, University Hospital Regensburg, 93053, Regensburg, Germany
| | - Christina Hackl
- Department of Surgery, University Hospital Regensburg, 93053, Regensburg, Germany
| | - Thiha Aung
- Institute for Molecular and Cellular Anatomy, University of Regensburg, 93053, Regensburg, Germany
- Faculty of Applied Healthcare Science, Deggendorf Institute of Technology, 94469, Deggendorf, Germany
| | - Silke Haerteis
- Institute for Molecular and Cellular Anatomy, University of Regensburg, 93053, Regensburg, Germany.
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Pion E, Karnosky J, Boscheck S, Wagner BJ, Schmidt KM, Brunner SM, Schlitt HJ, Aung T, Hackl C, Haerteis S. 3D In Vivo Models for Translational Research on Pancreatic Cancer: The Chorioallantoic Membrane (CAM) Model. Cancers (Basel) 2022; 14:cancers14153733. [PMID: 35954398 PMCID: PMC9367548 DOI: 10.3390/cancers14153733] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 07/21/2022] [Accepted: 07/28/2022] [Indexed: 11/25/2022] Open
Abstract
Simple Summary The 5-year overall survival rate for all stages of pancreatic cancer is relatively low at about only 6%. As a result of this exceedingly poor prognosis, new research models are necessary to investigate this highly malignant cancer. One model that has been used extensively for a vast variety of different cancers is the chorioallantoic membrane (CAM) model. It is based on an exceptionally vascularized membrane that develops within fertilized chicken eggs and can be used for the grafting and analysis of tumor tissue. The aim of the study was to summarize already existing works on pancreatic ductal adenocarcinoma (PDAC) and the CAM model. The results were subdivided into different categories that include drug testing, angiogenesis, personalized medicine, modifications of the model, and further developments to help improve the unfavorable prognosis of this disease. Abstract Pancreatic ductal adenocarcinoma (PDAC) is a highly aggressive cancer with adverse outcomes that have barely improved over the last decade. About half of all patients present with metastasis at the time of diagnosis, and the 5-year overall survival rate across all stages is only 6%. Innovative in vivo research models are necessary to combat this cancer and to discover novel treatment strategies. The chorioallantoic membrane (CAM) model represents one 3D in vivo methodology that has been used in a large number of studies on different cancer types for over a century. This model is based on a membrane formed within fertilized chicken eggs that contain a dense network of blood vessels. Because of its high cost-efficiency, simplicity, and versatility, the CAM model appears to be a highly valuable research tool in the pursuit of gaining more in-depth insights into PDAC. A summary of the current literature on the usage of the CAM model for the investigation of PDAC was conducted and subdivided into angiogenesis, drug testing, modifications, personalized medicine, and further developments. On this comprehensive basis, further research should be conducted on PDAC in order to improve the abysmal prognosis of this malignant disease.
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Affiliation(s)
- Eric Pion
- Institute for Molecular and Cellular Anatomy, University of Regensburg, 93053 Regensburg, Germany; (E.P.); (S.B.); (T.A.)
| | - Julia Karnosky
- Department of Surgery, University Hospital Regensburg, 93053 Regensburg, Germany; (J.K.); (B.J.W.); (K.M.S.); (S.M.B.); (H.J.S.); (C.H.)
| | - Sofie Boscheck
- Institute for Molecular and Cellular Anatomy, University of Regensburg, 93053 Regensburg, Germany; (E.P.); (S.B.); (T.A.)
| | - Benedikt J. Wagner
- Department of Surgery, University Hospital Regensburg, 93053 Regensburg, Germany; (J.K.); (B.J.W.); (K.M.S.); (S.M.B.); (H.J.S.); (C.H.)
| | - Katharina M. Schmidt
- Department of Surgery, University Hospital Regensburg, 93053 Regensburg, Germany; (J.K.); (B.J.W.); (K.M.S.); (S.M.B.); (H.J.S.); (C.H.)
| | - Stefan M. Brunner
- Department of Surgery, University Hospital Regensburg, 93053 Regensburg, Germany; (J.K.); (B.J.W.); (K.M.S.); (S.M.B.); (H.J.S.); (C.H.)
| | - Hans J. Schlitt
- Department of Surgery, University Hospital Regensburg, 93053 Regensburg, Germany; (J.K.); (B.J.W.); (K.M.S.); (S.M.B.); (H.J.S.); (C.H.)
| | - Thiha Aung
- Institute for Molecular and Cellular Anatomy, University of Regensburg, 93053 Regensburg, Germany; (E.P.); (S.B.); (T.A.)
- Faculty of Applied Healthcare Science, Deggendorf Institute of Technology, 94469 Deggendorf, Germany
| | - Christina Hackl
- Department of Surgery, University Hospital Regensburg, 93053 Regensburg, Germany; (J.K.); (B.J.W.); (K.M.S.); (S.M.B.); (H.J.S.); (C.H.)
| | - Silke Haerteis
- Institute for Molecular and Cellular Anatomy, University of Regensburg, 93053 Regensburg, Germany; (E.P.); (S.B.); (T.A.)
- Correspondence:
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Drexler K, Schmidt KM, Jordan K, Federlin M, Milenkovic VM, Liebisch G, Artati A, Schmidl C, Madej G, Tokarz J, Cecil A, Jagla W, Haerteis S, Aung T, Wagner C, Kolodziejczyk M, Heinke S, Stanton EH, Schwertner B, Riegel D, Wetzel CH, Buchalla W, Proescholdt M, Klein CA, Berneburg M, Schlitt HJ, Brabletz T, Ziegler C, Parkinson EK, Gaumann A, Geissler EK, Adamski J, Haferkamp S, Mycielska ME. Cancer-associated cells release citrate to support tumour metastatic progression. Life Sci Alliance 2021; 4:e202000903. [PMID: 33758075 PMCID: PMC7994318 DOI: 10.26508/lsa.202000903] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 03/09/2021] [Accepted: 03/10/2021] [Indexed: 12/14/2022] Open
Abstract
Citrate is important for lipid synthesis and epigenetic regulation in addition to ATP production. We have previously reported that cancer cells import extracellular citrate via the pmCiC transporter to support their metabolism. Here, we show for the first time that citrate is supplied to cancer by cancer-associated stroma (CAS) and also that citrate synthesis and release is one of the latter's major metabolic tasks. Citrate release from CAS is controlled by cancer cells through cross-cellular communication. The availability of citrate from CAS regulated the cytokine profile, metabolism and features of cellular invasion. Moreover, citrate released by CAS is involved in inducing cancer progression especially enhancing invasiveness and organ colonisation. In line with the in vitro observations, we show that depriving cancer cells of citrate using gluconate, a specific inhibitor of pmCiC, significantly reduced the growth and metastatic spread of human pancreatic cancer cells in vivo and muted stromal activation and angiogenesis. We conclude that citrate is supplied to tumour cells by CAS and citrate uptake plays a significant role in cancer metastatic progression.
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Affiliation(s)
- Konstantin Drexler
- Department of Dermatology, University Medical Centre, Regensburg, Germany
| | | | - Katrin Jordan
- Department of Surgery, University Medical Center, Regensburg, Germany
| | - Marianne Federlin
- Department of Conservative Dentistry and Periodontology, University Medical Center, Regensburg, Germany
| | - Vladimir M Milenkovic
- Department of Psychiatry and Psychotherapy, University of Regensburg, Regensburg, Germany
| | - Gerhard Liebisch
- Institute of Clinical Chemistry and Laboratory Medicine, Regensburg University Hospital, Regensburg, Germany
| | - Anna Artati
- Research Unit Molecular Endocrinology and Metabolism, Helmholtz Zentrum München, German Research Centre for Environmental Health, Neuherberg, Germany
| | - Christian Schmidl
- Regensburg Center for Interventional Immunology, Regensburg, Germany
| | - Gregor Madej
- Department of Structural Biology, Institute of Biophysics and Physical Biochemistry, University of Regensburg, Regensburg, Germany
| | - Janina Tokarz
- Research Unit Molecular Endocrinology and Metabolism, Helmholtz Zentrum München, German Research Centre for Environmental Health, Neuherberg, Germany
| | - Alexander Cecil
- Research Unit Molecular Endocrinology and Metabolism, Helmholtz Zentrum München, German Research Centre for Environmental Health, Neuherberg, Germany
| | - Wolfgang Jagla
- Institute of Pathology, Kaufbeuren-Ravensburg, Kaufbeuren, Germany
| | - Silke Haerteis
- Institute for Molecular and Cellular Anatomy, University of Regensburg, Regensburg, Germany
| | - Thiha Aung
- Institute for Molecular and Cellular Anatomy, University of Regensburg, Regensburg, Germany
- Center of Plastic, Aesthetic, Hand and Reconstructive Surgery, University of Regensburg, Regensburg, Germany
| | - Christine Wagner
- Department of Surgery, University Medical Center, Regensburg, Germany
| | | | - Stefanie Heinke
- Department of Surgery, University Medical Center, Regensburg, Germany
| | - Evan H Stanton
- Department of Surgery, University Medical Center, Regensburg, Germany
| | - Barbara Schwertner
- Department of Dermatology, University Medical Centre, Regensburg, Germany
| | - Dania Riegel
- Regensburg Center for Interventional Immunology, Regensburg, Germany
| | - Christian H Wetzel
- Department of Psychiatry and Psychotherapy, University of Regensburg, Regensburg, Germany
| | - Wolfgang Buchalla
- Department of Conservative Dentistry and Periodontology, University Medical Center, Regensburg, Germany
| | - Martin Proescholdt
- Department of Neurosurgery, University Hospital Regensburg, Regensburg, Germany
| | - Christoph A Klein
- Experimental Medicine and Therapy Research, University of Regensburg, Regensburg, Germany
| | - Mark Berneburg
- Department of Dermatology, University Medical Centre, Regensburg, Germany
| | - Hans J Schlitt
- Department of Surgery, University Medical Center, Regensburg, Germany
| | - Thomas Brabletz
- Department of Experimental Medicine 1, Friedrich-Alexander-University Erlangen, Erlangen, Germany
| | - Christine Ziegler
- Department of Structural Biology, Institute of Biophysics and Physical Biochemistry, University of Regensburg, Regensburg, Germany
| | - Eric K Parkinson
- Centre for Immunobiology and Regenerative Medicine, Blizard Institute, Barts and The London School of Medicine and Dentistry, London, UK
| | - Andreas Gaumann
- Institute of Pathology, Kaufbeuren-Ravensburg, Kaufbeuren, Germany
| | - Edward K Geissler
- Department of Surgery, University Medical Center, Regensburg, Germany
| | - Jerzy Adamski
- Research Unit Molecular Endocrinology and Metabolism, Helmholtz Zentrum München, German Research Centre for Environmental Health, Neuherberg, Germany
- Lehrstuhl für Experimentelle Genetik, Technische Universität München, Munich, Germany
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | | | - Maria E Mycielska
- Department of Surgery, University Medical Center, Regensburg, Germany
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Brennfleck FW, Linsenmeier L, Junger HH, Schmidt KM, Werner JM, Woehl D, Zeman F, Mutzbauer I, Hutchinson JA, Geissler EK, Schlitt HJ, Brunner SM. Negative pressure wound therapy (NPWT) on closed incisions to prevent surgical site infection in high-risk patients in hepatopancreatobiliary surgery: study protocol for a randomized controlled trial-the NP-SSI trial. Trials 2020; 21:918. [PMID: 33168081 PMCID: PMC7654160 DOI: 10.1186/s13063-020-04831-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 10/20/2020] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Incisional surgical site infections (iSSI) in hepatopancreatobiliary (HPB) surgery usually lead to prolonged hospital stays, consume valuable resources, and impact on patients' outcome. Prophylactic closed incision negative pressure wound therapy (ciNPWT) to decrease wound complications has become available. Owing to an increasing number of studies, evidence for superiority in many indication areas has accumulated; however, in general surgery, there are a few data and those have shown contradictory results. METHODS In this monocentric, prospective, randomized, controlled, two-armed study, the influence of ciNPWT on incisional surgical site infection rates after HPB operations will be investigated. A total of 222 patients will be randomized 1:1 to an interventional group (7-day treatment with ciNPWT) or a control group (treated with gauze dressing). The primary parameter to evaluate efficacy is the rate of incisional SSIs within 30 days after surgery. Additionally, several clinically relevant secondary outcomes will be assessed. DISCUSSION A reduction in the rate of incisional SSIs would not only lead to a significant cost reduction and shorter postoperative length of stay, but may also improve postoperative quality of life for patients. While earlier publications have shown advantages for ciNPWT, recent studies did not confirm a positive effect regarding iSSI rate. Even if iSSI rate is not reduced, findings obtained from the secondary endpoints may be of clinical relevance, such as reduction of wound complication rates. TRIAL REGISTRATION This trial has been registered in the German Clinical Trials Register, DRKS 00015136 . Registered on 19 February 2019 and has been approved by the local ethics committee of the University of Regensburg: 18-1225-101.
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Affiliation(s)
- Frank W. Brennfleck
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauß Allee 11, 93053 Regensburg, Germany
| | - Lena Linsenmeier
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauß Allee 11, 93053 Regensburg, Germany
| | - Henrik H.G. Junger
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauß Allee 11, 93053 Regensburg, Germany
| | - Katharina M. Schmidt
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauß Allee 11, 93053 Regensburg, Germany
| | - Jens M. Werner
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauß Allee 11, 93053 Regensburg, Germany
| | - Daniel Woehl
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauß Allee 11, 93053 Regensburg, Germany
| | - Florian Zeman
- Center for Clinical Trials, University Hospital Regensburg, Franz-Josef-Strauß-Allee 11, 93053 Regensburg, Germany
| | - Ingrid Mutzbauer
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauß Allee 11, 93053 Regensburg, Germany
| | - James A. Hutchinson
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauß Allee 11, 93053 Regensburg, Germany
| | - Edward K. Geissler
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauß Allee 11, 93053 Regensburg, Germany
| | - Hans J. Schlitt
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauß Allee 11, 93053 Regensburg, Germany
| | - Stefan M. Brunner
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauß Allee 11, 93053 Regensburg, Germany
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Hackl C, Schmidt KM, Süsal C, Döhler B, Zidek M, Schlitt HJ. Split liver transplantation: Current developments. World J Gastroenterol 2018; 24:5312-5321. [PMID: 30598576 PMCID: PMC6305537 DOI: 10.3748/wjg.v24.i47.5312] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 10/09/2018] [Accepted: 10/21/2018] [Indexed: 02/06/2023] Open
Abstract
In 1988, Rudolf Pichlmayr pioneered split liver transplantation (SLT), enabling the transplantation of one donor liver into two recipients - one pediatric and one adult patient. In the same year, Henri Bismuth and colleagues performed the first full right/full left split procedure with two adult recipients. Both splitting techniques were rapidly adopted within the transplant community. However, a SLT is technically demanding, may cause increased perioperative complications, and may potentially transform an excellent deceased donor organ into two marginal quality grafts. Thus, crucial evaluation of donor organs suitable for splitting and careful screening of potential SLT recipients is warranted. Furthermore, the logistic background of the splitting procedure as well as the organ allocation policy must be adapted to further increase the number and the safety of SLT. Under defined circumstances, in selected patients and at experienced transplant centers, SLT outcomes can be similar to those obtained in full organ LT. Thus, SLT is an important tool to reduce the donor organ shortage and waitlist mortality, especially for pediatric patients and small adults. The present review gives an overview of technical aspects, current developments, and clinical outcomes of SLT.
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Affiliation(s)
- Christina Hackl
- Department of Surgery, University Hospital Regensburg, Regensburg 93053, Germany
| | - Katharina M Schmidt
- Department of Surgery, University Hospital Regensburg, Regensburg 93053, Germany
| | - Caner Süsal
- Collaborative Transplant Study (CTS), Institute of Immunology, Heidelberg University, Heidelberg 69120, Germany
| | - Bernd Döhler
- Collaborative Transplant Study (CTS), Institute of Immunology, Heidelberg University, Heidelberg 69120, Germany
| | - Martin Zidek
- Department of Surgery, University Hospital Regensburg, Regensburg 93053, Germany
| | - Hans J Schlitt
- Department of Surgery, University Hospital Regensburg, Regensburg 93053, Germany
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Schmidt KM, Dietrich P, Hackl C, Guenzle J, Bronsert P, Wagner C, Fichtner-Feigl S, Schlitt HJ, Geissler EK, Hellerbrand C, Lang SA. Inhibition of mTORC2/RICTOR Impairs Melanoma Hepatic Metastasis. Neoplasia 2018; 20:1198-1208. [PMID: 30404068 PMCID: PMC6224335 DOI: 10.1016/j.neo.2018.10.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 10/09/2018] [Accepted: 10/11/2018] [Indexed: 02/07/2023] Open
Abstract
Mammalian target of rapamycin complex 2 (mTORC2) with its pivotal component rapamycin-insensitive companion of mTOR (RICTOR) is the major regulator of AKT phosphorylation and is increasingly implicated in tumor growth and progression. In cutaneous melanoma, an extremely aggressive and highly metastatic disease, RICTOR overexpression is involved in tumor development and invasiveness. Therefore, we investigated the impact of RICTOR inhibition in melanoma cells in vitro and in vivo with special emphasis on hepatic metastasis. Moreover, our study focused on the interaction of tumor cells and hepatic stellate cells (HSC) which play a crucial role in the hepatic microenvironment. In silico analysis revealed increased RICTOR expression in melanoma cells and tissues and indicated higher expression in advanced melanoma stages and metastases. In vitro, transient RICTOR knock-down via siRNA caused a significant reduction of tumor cell motility. Using a syngeneic murine splenic injection model, a significant decrease in liver metastasis burden was detected in vivo. Moreover, stimulation of melanoma cells with conditioned medium (CM) from activated HSC or hepatocyte growth factor (HGF) led to a significant induction of AKT phosphorylation and tumor cell motility. Blocking of RICTOR expression in cancer cells diminished constitutive and HGF-induced AKT phosphorylation as well as cell motility. Interestingly, RICTOR blockade also led to an abrogation of CM-induced effects on AKT phosphorylation and motility in melanoma cells. In conclusion, these results provide first evidence for a critical role of mTORC2/RICTOR in melanoma liver metastasis via cancer cell/HSC interactions.
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Affiliation(s)
- Katharina M Schmidt
- Department of Surgery, Regensburg University Hospital, Franz-Josef-Strauss Allee 9, Regensburg, Germany.
| | - Peter Dietrich
- Institute of Biochemistry, Friedrich-Alexander University Erlangen-Nürnberg, Fahrstrasse 17, Germany; Department of Medicine 1, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany.
| | - Christina Hackl
- Department of Surgery, Regensburg University Hospital, Franz-Josef-Strauss Allee 9, Regensburg, Germany.
| | - Jessica Guenzle
- Department of General and Visceral Surgery, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Hugstetter Strasse 55, Germany.
| | - Peter Bronsert
- Institute for Surgical Pathology, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Breisacher Strasse 115a, Germany; Tumorbank Comprehensive Cancer Center Freiburg, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Breisacher Strasse 115a, Germany.
| | - Christine Wagner
- Department of Surgery, Regensburg University Hospital, Franz-Josef-Strauss Allee 9, Regensburg, Germany.
| | - Stefan Fichtner-Feigl
- Department of General and Visceral Surgery, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Hugstetter Strasse 55, Germany.
| | - Hans J Schlitt
- Department of Surgery, Regensburg University Hospital, Franz-Josef-Strauss Allee 9, Regensburg, Germany.
| | - Edward K Geissler
- Department of Surgery, Regensburg University Hospital, Franz-Josef-Strauss Allee 9, Regensburg, Germany.
| | - Claus Hellerbrand
- Institute of Biochemistry, Friedrich-Alexander University Erlangen-Nürnberg, Fahrstrasse 17, Germany.
| | - Sven A Lang
- Department of Surgery, Regensburg University Hospital, Franz-Josef-Strauss Allee 9, Regensburg, Germany; Department of General and Visceral Surgery, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Hugstetter Strasse 55, Germany.
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7
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Joechle K, Moser C, Ruemmele P, Schmidt KM, Werner JM, Geissler EK, Schlitt HJ, Lang SA. ALPPS (associating liver partition and portal vein ligation for staged hepatectomy) does not affect proliferation, apoptosis, or angiogenesis as compared to standard liver resection for colorectal liver metastases. World J Surg Oncol 2017; 15:57. [PMID: 28270160 PMCID: PMC5341393 DOI: 10.1186/s12957-017-1121-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Accepted: 02/14/2017] [Indexed: 01/27/2023] Open
Abstract
Background ALPPS (associating liver partition and portal vein ligation for staged hepatectomy) is a novel two-stage strategy to induce rapid hypertrophy of the future liver remnant (FLR) when patients are in danger of postoperative liver failure due to insufficient FLR. However, the effects of ALPPS on colorectal liver metastases (CRLM) are not clear so far. The aim of our study was to determine whether ALPPS induces proliferation, apoptosis, or vascularization compared to standard (one-stage) liver resection. Methods Six patients who underwent ALPPS were matched with 12 patients undergoing standard liver resection regarding characteristics of the metastases (size, number), time of appearance (syn-/metachronous), preoperative chemotherapy, primary tumor (localization, TNM stage, grading), and patient variables (gender, age). The largest resected metastasis was used for the analyses. Tissue was stained for tumor cell proliferation (Ki67), apoptosis (TUNEL, caspase-3), vascularization (CD31), and pericytes (αSMA). Results Vascularization (CD31; p = 0.149), proliferation (Mib-1; p = 0.244), and αSMA expression (p = 0.205) did not significantly differ between the two groups, although a trend towards less proliferation and αSMA expression was observed in patients undergoing ALPPS. Concerning apoptosis, caspase-3 staining showed significantly fewer apoptotic cells upon ALPPS (p < 0.0001), but this was not confirmed by TUNEL staining (p = 0.7344). Conclusions ALPPS does not induce proliferation, apoptosis, or vascularization of CRLM when compared to standard liver resection.
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Affiliation(s)
- Katharina Joechle
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauss Allee 11, 93053, Regensburg, Germany
| | - Christian Moser
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauss Allee 11, 93053, Regensburg, Germany
| | - Petra Ruemmele
- Department of Pathology, University Hospital Regensburg, Franz-Josef-Strauss Allee 11, 93053, Regensburg, Germany
| | - Katharina M Schmidt
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauss Allee 11, 93053, Regensburg, Germany
| | - Jens M Werner
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauss Allee 11, 93053, Regensburg, Germany
| | - Edward K Geissler
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauss Allee 11, 93053, Regensburg, Germany
| | - Hans J Schlitt
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauss Allee 11, 93053, Regensburg, Germany
| | - Sven A Lang
- Department of Surgery, University Hospital Regensburg, Franz-Josef-Strauss Allee 11, 93053, Regensburg, Germany.
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Schmidt KM, Geissler EK, Lang SA. Subcutaneous Murine Xenograft Models: A Critical Tool for Studying Human Tumor Growth and Angiogenesis In Vivo. Methods Mol Biol 2016; 1464:129-137. [PMID: 27858362 DOI: 10.1007/978-1-4939-3999-2_12] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Subcutaneous tumor models are widely used in angiogenesis research. Due to the relative simplicity, these mouse models are ideal for the evaluation of molecular hypotheses. In addition, these models are frequently used to assess anti-angiogenic efficacy during drug development. Finally, subcutaneous models can be performed with either xenogeneic or syngeneic tumors, both harboring advantages and drawbacks. Herein, we describe the use of subcutaneous xenograft models in anticancer research.
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Affiliation(s)
- Katharina M Schmidt
- Department of Surgery, University Hospital Regensburg, University of Regensburg, Franz-Josef-Strauss Allee 11, 93053, Regensburg, Germany
| | - Edward K Geissler
- Department of Surgery, University Hospital Regensburg, University of Regensburg, Franz-Josef-Strauss Allee 11, 93053, Regensburg, Germany
| | - Sven A Lang
- Department of Surgery, University Hospital Regensburg, University of Regensburg, Franz-Josef-Strauss Allee 11, 93053, Regensburg, Germany.
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9
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Gonder-Frederick LA, Vajda KA, Schmidt KM, Cox DJ, Devries JH, Erol O, Kanc K, Schächinger H, Snoek FJ. Examining the Behaviour subscale of the Hypoglycaemia Fear Survey: an international study. Diabet Med 2013; 30:603-9. [PMID: 23324032 DOI: 10.1111/dme.12129] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Revised: 11/07/2012] [Accepted: 01/10/2013] [Indexed: 11/29/2022]
Abstract
AIMS The Hypoglycemia Fear Survey (HFS)-II Behaviour and Worry subscales were developed to measure behaviours and anxiety related to hypoglycaemia in diabetes. However, previous studies found lower reliability in the HFS Behaviour subscale and inconsistent relationships with glucose control. The purpose of this study was to conduct extensive analyses of the internal structure of the HFS Behaviour subscale's internal structure and its relationships with diabetes outcomes, including HbA1c and episodes of severe hypoglycaemia. METHODS HFS-II survey data from 1460 adults with Type 1 diabetes were collected from five countries. This aggregated sample underwent exploratory factor analysis and item analysis to determine the internal structure of the survey and subscales. RESULTS A three-factor solution showed the best fit for the HFS, with two subscales emerging from the HFS Behaviour representing tendencies towards (1) maintenance of high blood glucose and (2) avoidance of hypoglycaemic risks by other behaviours, and a third single HFS Worry subscale. Subscale item analysis showed excellent fit, separation and good point-measure correlations. All subscales demonstrated acceptable (0.75) to excellent (0.94) internal reliability. HbA(1c) correlated with Maintain High Blood Glucose subscale scores, r = 0.14, P < 0.001, and severe hypoglycaemia frequency correlated with all subscales. CONCLUSIONS The HFS Worry subscale measures one construct of anxiety about various aspects of hypoglycaemia. In contrast, the HFS Behaviour subscale appears to measure two distinct aspects of behavioural avoidance to prevent hypoglycaemia, actions which maintain high blood glucose and other behaviours to avoid hypoglycaemic risk. These results demonstrate the clinical importance of the HFS Behaviour subscales and their differential relationships with measures of diabetes outcome such as HbA1c .
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Kerfriden P, Schmidt KM, Rabczuk T, Bordas SPA. Extraction of process zones and low-dimensional attractive subspaces in stochastic fracture mechanics. Int J Multiscale Comput Eng 2013; 11:253-287. [PMID: 27069423 PMCID: PMC4826600 DOI: 10.1615/intjmultcompeng.2013005939] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We propose to identify process zones in heterogeneous materials by tailored statistical tools. The process zone is redefined as the part of the structure where the random process cannot be correctly approximated in a low-dimensional deterministic space. Such a low-dimensional space is obtained by a spectral analysis performed on pre-computed solution samples. A greedy algorithm is proposed to identify both process zone and low-dimensional representative subspace for the solution in the complementary region. In addition to the novelty of the tools proposed in this paper for the analysis of localised phenomena, we show that the reduced space generated by the method is a valid basis for the construction of a reduced order model.
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Affiliation(s)
- P Kerfriden
- Cardiff University, School of Engineering Queen's Buildings, The Parade, Cardiff CF24 3AA, Wales, UK
| | - K M Schmidt
- Cardiff University, School of Mathematics Senghennydd Road, Cardiff CF24 4AG, Wales, UK
| | - T Rabczuk
- Institute of Structural Mechanics, Bauhaus-University Weimar Marienstraße 15, 99423 Weimar, Germany
| | - S P A Bordas
- Cardiff University, School of Engineering Queen's Buildings, The Parade, Cardiff CF24 3AA, Wales, UK
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Abstract
Traditionally in genetic case-control studies controls have been screened to exclude subjects with a personal history of illness. This control group has the advantage of optimal power to detect loci involved in illness, but requires more work and may incur substantial cost in recruitment. An alternative approach to screening is to use unscreened controls sampled from the general population. Such controls are generally plentiful and inexpensive, but in general there is a risk that some may have the same disease as the cases, which will reduce power to detect associations. We have quantified the extent of this power loss, and produced mathematical formulae for the number of unscreened controls necessary to achieve the same power as a fixed sample of screened controls. The effect of using unscreened controls will also depend on the ratio of the number of screened controls to cases specified in the original study design, and this is also investigated. We have also investigated the cost-benefits of the screened and unscreened approaches, according to variation in the relative costs of sampling screened and unscreened controls, together with genotyping costs. We have, thus, identified the range of situations in which using unscreened controls is a cost-effective alternative to the screened control method and could be considered when designing a study. In many of the typical, real-world situations in complex genetics, the use of unscreened controls is potentially cost-effective and can, in general, be considered for disorders with population prevalence Kp < 0.2. With the steady reduction in genotyping costs and the availability of common sets of "population controls" this design is likely to become increasingly cost effective.
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Affiliation(s)
- V Moskvina
- Bioinformatics and Biostatistics Unit, Cardiff University, College of Medicine, CF14 4XN, UK
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Schmidt KM. Public speaking. A tool God can use. J Christ Nurs 2002; 18:26-8. [PMID: 11915084 DOI: 10.1097/00005217-200118010-00008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Schmidt KM. Inner City Health Center. Dispensing help & hope. J Christ Nurs 2002; 18:8-10. [PMID: 11915114 DOI: 10.1097/00005217-200118030-00003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Schmidt KM. Building bridges with girls in crisis. J Christ Nurs 2002; 19:30-2. [PMID: 11768890 DOI: 10.1097/01.cnj.0000262147.65878.4a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Abstract
Fantasies concerning an amputated limb can contribute to the occurrence of persistent phantom limb pain. We report a case in which burning pain perceived as located in the amputated lower extremities was related to the patient's feelings about incineration of the removed limbs against her wishes. Hypnotherapy involving elucidation of the fantasy and suggestion was successfully employed in this case and may be a helpful approach in other such cases. Importantly, adequate preparation of the patient for amputation, including an awareness of concerns about the disposition of the limb, may help prevent pathological limb sensations.
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Kangas JA, Schmidt KM, Solomon GF. Effect of vitamin E on the development of stress-produced gastric ulceration in the rat. Am J Clin Nutr 1972; 25:864-6. [PMID: 4626561 DOI: 10.1093/ajcn/25.9.864] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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Schmidt KM, Klopfer FD. Ethanol and stomach ulcers: absence of influence in the albino rat. Q J Stud Alcohol 1968; 29:558-65. [PMID: 5682655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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