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Nagaoka K, Bai X, Liu D, Cao K, Mulla J, Ji C, Chen H, Nisar MA, Bay A, Mueller W, Hildebrand G, Gao JS, Lu S, Setoyama H, Tanaka Y, Wands JR, Huang CK. Elevated 2-oxoglutarate antagonizes DNA damage responses in cholangiocarcinoma chemotherapy through regulating aspartate beta-hydroxylase. Cancer Lett 2024; 580:216493. [PMID: 37977350 DOI: 10.1016/j.canlet.2023.216493] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 09/22/2023] [Accepted: 11/07/2023] [Indexed: 11/19/2023]
Abstract
Cholangiocarcinoma (CCA) is resistant to systemic chemotherapies that kill malignant cells mainly through DNA damage responses (DDRs). Recent studies suggest that the involvement of 2-oxoglutarate (2-OG) dependent dioxygenases in DDRs may be associated with chemoresistance in malignancy, but how 2-OG impacts DDRs in CCA chemotherapy remains elusive. We examined serum 2-OG levels in CCA patients before receiving chemotherapy. CCA patients are classified as progressive disease (PD), partial response (PR), and stable disease (SD) after receiving chemotherapy. CCA patients classified as PD showed significantly higher serum 2-OG levels than those defined as SD and PR. Treating CCA cells with 2-OG reduced DDRs. Overexpression of full-length aspartate beta-hydroxylase (ASPH) could mimic the effects of 2-OG on DDRs, suggesting the important role of ASPH in chemoresistance. Indeed, the knockdown of ASPH improved chemotherapy in CCA cells. Targeting ASPH with a specific small molecule inhibitor also enhanced the effects of chemotherapy. Mechanistically, ASPH modulates DDRs by affecting ATM and ATR, two of the major regulators finely controlling DDRs. More importantly, targeting ASPH improved the therapeutic potential of chemotherapy in two preclinical CCA models. Our data suggested the impacts of elevated 2-OG and ASPH on chemoresistance through antagonizing DDRs. Targeting ASPH may enhance DDRs, improving chemotherapy in CCA patients.
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Affiliation(s)
- Katsuya Nagaoka
- Liver Research Center, Rhode Island Hospital and the Alpert Medical School of Brown University, Providence, RI, USA; Department of Gastroenterology & Hepatology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Xuewei Bai
- Liver Research Center, Rhode Island Hospital and the Alpert Medical School of Brown University, Providence, RI, USA
| | - Dan Liu
- Liver Research Center, Rhode Island Hospital and the Alpert Medical School of Brown University, Providence, RI, USA
| | - Kevin Cao
- Liver Research Center, Rhode Island Hospital and the Alpert Medical School of Brown University, Providence, RI, USA
| | - Joud Mulla
- Liver Research Center, Rhode Island Hospital and the Alpert Medical School of Brown University, Providence, RI, USA
| | - Chengcheng Ji
- Liver Research Center, Rhode Island Hospital and the Alpert Medical School of Brown University, Providence, RI, USA
| | - Hongze Chen
- Department of Pathology and Laboratory Medicine, Tulane University, New Orleans, LA, USA
| | - Muhammad Azhar Nisar
- Department of Pathology and Laboratory Medicine, Tulane University, New Orleans, LA, USA
| | - Amalia Bay
- Liver Research Center, Rhode Island Hospital and the Alpert Medical School of Brown University, Providence, RI, USA
| | - William Mueller
- Liver Research Center, Rhode Island Hospital and the Alpert Medical School of Brown University, Providence, RI, USA
| | - Grace Hildebrand
- Liver Research Center, Rhode Island Hospital and the Alpert Medical School of Brown University, Providence, RI, USA
| | - Jin-Song Gao
- Liver Research Center, Rhode Island Hospital and the Alpert Medical School of Brown University, Providence, RI, USA
| | - Shaolei Lu
- Department of Pathology and Laboratory Medicine, Alpert Medical School of Brown University, Providence, RI, 02903, USA
| | - Hiroko Setoyama
- Department of Gastroenterology & Hepatology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Yasuhito Tanaka
- Department of Gastroenterology & Hepatology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Jack R Wands
- Liver Research Center, Rhode Island Hospital and the Alpert Medical School of Brown University, Providence, RI, USA
| | - Chiung-Kuei Huang
- Liver Research Center, Rhode Island Hospital and the Alpert Medical School of Brown University, Providence, RI, USA; Department of Pathology and Laboratory Medicine, Tulane University, New Orleans, LA, USA.
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2
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Bai X, Zhang H, Zhou Y, Nagaoka K, Meng J, Ji C, Liu D, Dong X, Cao K, Mulla J, Cheng Z, Mueller W, Bay A, Hildebrand G, Lu S, Wallace J, Wands JR, Sun B, Huang CK. Ten-Eleven Translocation 1 Promotes Malignant Progression of Cholangiocarcinoma With Wild-Type Isocitrate Dehydrogenase 1. Hepatology 2021; 73:1747-1763. [PMID: 32740973 PMCID: PMC7855500 DOI: 10.1002/hep.31486] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 06/20/2020] [Accepted: 06/22/2020] [Indexed: 12/11/2022]
Abstract
BACKGROUND AND AIMS Cholangiocarcinoma (CCA) is a highly lethal disease without effective therapeutic approaches. The whole-genome sequencing data indicate that about 20% of patients with CCA have isocitrate dehydrogenase 1 (IDH1) mutations, which have been suggested to target 2-oxoglutarate (OG)-dependent dioxygenases in promoting CCA carcinogenesis. However, the clinical study indicates that patients with CCA and mutant IDH1 have better prognosis than those with wild-type IDH1, further complicating the roles of 2-OG-dependent enzymes. APPROACH AND RESULTS This study aimed to clarify if ten-eleven translocation 1 (TET1), which is one of the 2-OG-dependent enzymes functioning in regulating 5-hydroxymethylcytosine (5hmC) formation, is involved in CCA progression. By analyzing The Cancer Genome Atlas (TCGA) data set, TET1 mRNA was found to be substantially up-regulated in patients with CCA when compared with noncancerous bile ducts. Additionally, TET1 protein expression was significantly elevated in human CCA tumors. CCA cells were challenged with α-ketoglutarate (α-KG) and dimethyl-α-KG (DM-α-KG), which are cosubstrates for TET1 dioxygenase. The treatments with α-KG and DM-α-KG promoted 5hmC formation and malignancy of CCA cells. Molecular and pharmacological approaches were used to inhibit TET1 activity, and these treatments substantially suppressed 5hmC and CCA carcinogenesis. Mechanistically, it was found that knockdown of TET1 may suppress CCA progression by targeting cell growth and apoptosis through epigenetic regulation. Consistently, targeting TET1 significantly inhibited CCA malignant progression in a liver orthotopic xenograft model by targeting cell growth and apoptosis. CONCLUSIONS Our data suggest that expression of TET1 is highly associated with CCA carcinogenesis. It will be important to evaluate TET1 expression in CCA tumors before application of the IDH1 mutation inhibitor because the inhibitor suppresses 2-hydroxyglutarate expression, which may result in activation of TET, potentially leading to CCA malignancy.
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Affiliation(s)
- Xuewei Bai
- Department of Pancreatic and Biliary Surgery, First
Affiliated Hospital of Harbin Medical University, Harbin 150001, China; Liver
Research Center, Division of Gastroenterology & Liver Research Center, Warren
Alpert Medical School of Brown University and Rhode Island Providence, RI, USA,Liver Research Center, Division of Gastroenterology &
Liver Research Center, Warren Alpert Medical School of Brown University and Rhode
Island Hospital, Providence, RI, USA
| | - Hongyu Zhang
- Liver Research Center, Division of Gastroenterology &
Liver Research Center, Warren Alpert Medical School of Brown University and Rhode
Island Hospital, Providence, RI, USA
| | - Yamei Zhou
- Department of Pancreatic and Biliary Surgery, First
Affiliated Hospital of Harbin Medical University, Harbin 150001, China; Liver
Research Center, Division of Gastroenterology & Liver Research Center, Warren
Alpert Medical School of Brown University and Rhode Island Providence, RI, USA,Liver Research Center, Division of Gastroenterology &
Liver Research Center, Warren Alpert Medical School of Brown University and Rhode
Island Hospital, Providence, RI, USA
| | - Katsuya Nagaoka
- Liver Research Center, Division of Gastroenterology &
Liver Research Center, Warren Alpert Medical School of Brown University and Rhode
Island Hospital, Providence, RI, USA
| | - Jialin Meng
- Department of Urology, The First Affiliated Hospital of
Anhui Medical University; Institute of Urology & Anhui Province Key Laboratory
of Genitourinary Diseases, Anhui Medical University, Hefei, Anhui, China
| | - Chengcheng Ji
- Liver Research Center, Division of Gastroenterology &
Liver Research Center, Warren Alpert Medical School of Brown University and Rhode
Island Hospital, Providence, RI, USA
| | - Dan Liu
- Liver Research Center, Division of Gastroenterology &
Liver Research Center, Warren Alpert Medical School of Brown University and Rhode
Island Hospital, Providence, RI, USA
| | - Xianghui Dong
- Department of Pathology, The First Affiliated Hospital of
Harbin Medical University, Harbin 150001, Heilongjiang Province, P.R. China
| | - Kevin Cao
- Liver Research Center, Division of Gastroenterology &
Liver Research Center, Warren Alpert Medical School of Brown University and Rhode
Island Hospital, Providence, RI, USA
| | - Joud Mulla
- Liver Research Center, Division of Gastroenterology &
Liver Research Center, Warren Alpert Medical School of Brown University and Rhode
Island Hospital, Providence, RI, USA
| | - Zhixiang Cheng
- Liver Research Center, Division of Gastroenterology &
Liver Research Center, Warren Alpert Medical School of Brown University and Rhode
Island Hospital, Providence, RI, USA
| | - William Mueller
- Liver Research Center, Division of Gastroenterology &
Liver Research Center, Warren Alpert Medical School of Brown University and Rhode
Island Hospital, Providence, RI, USA
| | - Amalia Bay
- Liver Research Center, Division of Gastroenterology &
Liver Research Center, Warren Alpert Medical School of Brown University and Rhode
Island Hospital, Providence, RI, USA
| | - Grace Hildebrand
- Liver Research Center, Division of Gastroenterology &
Liver Research Center, Warren Alpert Medical School of Brown University and Rhode
Island Hospital, Providence, RI, USA
| | - Shaolei Lu
- Department of Pathology and Laboratory Medicine, Warren
Alpert Medical School of Brown University, Rhode Island Hospital, Providence, RI,
USA
| | - Joselynn Wallace
- Center for Computational Biology of Human Disease and
Center for Computation and Visualization, Brown University, Providence, RI,
USA
| | - Jack R. Wands
- Liver Research Center, Division of Gastroenterology &
Liver Research Center, Warren Alpert Medical School of Brown University and Rhode
Island Hospital, Providence, RI, USA
| | - Bei Sun
- Department of Pancreatic and Biliary Surgery, First
Affiliated Hospital of Harbin Medical University, Harbin 150001, China; Liver
Research Center, Division of Gastroenterology & Liver Research Center, Warren
Alpert Medical School of Brown University and Rhode Island Providence, RI, USA,Correspondence to: Chiung-Kuei Huang,
Ph.D., Liver Research Center, Rhode Island Hospital, Brown Alpert Medical
School, Brown University, 55 Claverick Street, Providence, RI 02903,
; Bei Sun, M.D., Ph.D. Department
of Pancreatic and Biliary Surgery, The First Affiliated Hospital of Harbin
Medical University. Key Laboratory of Hepatosplenic Surgery, Ministry of
Education, The First Affiliated Hospital of Harbin Medical University, No. 23
Youzheng Road, Nangang District, Harbin 150081, Heilongjiang Province, P.R.
China. Tel: 86-451-85555721; Fax: 86-451-53643849;
| | - Chiung-Kuei Huang
- Liver Research Center, Division of Gastroenterology &
Liver Research Center, Warren Alpert Medical School of Brown University and Rhode
Island Hospital, Providence, RI, USA,Correspondence to: Chiung-Kuei Huang,
Ph.D., Liver Research Center, Rhode Island Hospital, Brown Alpert Medical
School, Brown University, 55 Claverick Street, Providence, RI 02903,
; Bei Sun, M.D., Ph.D. Department
of Pancreatic and Biliary Surgery, The First Affiliated Hospital of Harbin
Medical University. Key Laboratory of Hepatosplenic Surgery, Ministry of
Education, The First Affiliated Hospital of Harbin Medical University, No. 23
Youzheng Road, Nangang District, Harbin 150081, Heilongjiang Province, P.R.
China. Tel: 86-451-85555721; Fax: 86-451-53643849;
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3
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Tur-Kaspa I, Tur-Kaspa T, Hildebrand G, Cohen D. COVID-19 may affect male fertility but is not sexually transmitted: a systematic review. ACTA ACUST UNITED AC 2021; 2:140-149. [PMID: 33558864 PMCID: PMC7857030 DOI: 10.1016/j.xfnr.2021.01.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 01/23/2021] [Accepted: 01/25/2021] [Indexed: 12/12/2022]
Abstract
Objective To determine if SARS-CoV-2, which has led to the rapidly spreading COVID-19 global pandemic, is sexually transmitted. Since the putative receptor for the virus is identified in reproductive organs, it is also important to examine if COVID-19 may affect human fertility. Evidence Review A systematic review of English publications was conducted up to December 11, 2020 in PubMed, NIH iCite COVID-19 portfolio, Cochrane Library, and Google Scholar databases, searching for SARS-CoV-2 in the testes; seminal, prostatic, and vaginal fluids; and cervical smears. A total of 1,997 records were identified, duplicates were removed, and 1,490 records were reviewed for eligibility by examining titles and abstracts. Subsequently, 202 full-text relevant articles were reviewed by 2 independent reviewers. Forty-seven studies (literature reviews, editorials, and guidelines) were assessed qualitatively, and 23 studies that tested the male and female reproductive tracts of patients with COVID-19 for SARS-CoV-2 were quantitatively analyzed. Results No epidemiological investigations to date have described evidence suggesting that COVID-19 is an STD. While angiotensin-converting enzyme 2 receptor is found in the reproductive organs, the lack of co-expression of the TMPRSS2 modulatory protein, required for SARS-CoV-2 cell entry, in testicular cells, sperm, or oocytes, argues against the hypothesis that gametes transmit SARS-CoV-2. Molecular detection studies of SARS-CoV-2 RNA in the male and female reproductive tracts were summarized: 98.0% (293/299) of the seminal fluids, 16/17 testicular biopsies, all 89 prostatic fluids, 98.3% (57/58) of the vaginal fluids, all 35 cervical smears, and all 16 oocyte samples tested negative for SARS-CoV-2. None of the studies confirmed sexual transmission of SARS-CoV-2. Nonetheless, COVID-19 may have detrimental effects on male reproduction by inducing orchitis and/or decreasing testosterone levels, sperm counts, and motility. Conclusion On the basis of the current worldwide published information, COVID-19 is not an STD. This information is important for clinicians, proposed guidelines for public health, U.S. Food and Drug Administration guidelines for gamete and tissue donor eligibility, and fertility treatments. Universal precautions, currently practiced worldwide, are adequate and sufficient at this time to prevent the transmission of known or unknown viral infections. We suggest that recovered patients of COVID-19, especially those with infertility, should be evaluated for their ovarian and testicular function.
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Affiliation(s)
- Ilan Tur-Kaspa
- Institute for Human Reproduction (IHR), Chicago and Oak Brook, Illinois, and Valparaiso, Indiana
| | - Tomer Tur-Kaspa
- Institute for Human Reproduction (IHR), Chicago and Oak Brook, Illinois, and Valparaiso, Indiana.,Wesleyan University, Middletown, Connecticut
| | - Grace Hildebrand
- Institute for Human Reproduction (IHR), Chicago and Oak Brook, Illinois, and Valparaiso, Indiana
| | - David Cohen
- Institute for Human Reproduction (IHR), Chicago and Oak Brook, Illinois, and Valparaiso, Indiana
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4
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Dietz A, Flentje M, Hagen R, Kortmann RD, Hildebrand G, Hoppe F, Schwienhorst I, Keilholz U. Docetaxel, cisplatin (TP), and radiation with or without cetuximab in advanced larynx carcinoma (DeLOS II trial). J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.tps265] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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5
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Schade R, Hildebrand G, Liefeith K. NEUE SYSTEME FÜR DIE PRÜFUNG ZAHNÄRZTLICHER WERKSTOFFE. BIOMED ENG-BIOMED TE 2009. [DOI: 10.1515/bmte.2000.45.s1.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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6
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Androwitsch M, Islam R, Hildebrand G. Phasenanalytische Bestimmung des Bindegewebsanteils in Fleischerzeugnissen. J Verbrauch Lebensm 2009. [DOI: 10.1007/s00003-009-0459-4] [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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7
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Schmidt E, Racenberg E, Hildebrand G, Büch U. Komplikationen und Gefahren der Plexusbrachialis-Anästhesie unter besonderer Berücksichtigung von Langzeitschäden. Anasthesiol Intensivmed Notfallmed Schmerzther 2008. [DOI: 10.1055/s-2007-1005398] [Citation(s) in RCA: 2] [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: 10/21/2022]
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8
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Senyah N, Hildebrand G, Liefeith K. Comparison between RGD-peptide-modified titanium and borosilicate surfaces. Anal Bioanal Chem 2005; 383:758-62. [PMID: 16151591 DOI: 10.1007/s00216-005-3274-5] [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] [Received: 03/01/2005] [Revised: 04/11/2005] [Accepted: 04/20/2005] [Indexed: 11/24/2022]
Abstract
The use of synthetic peptides containing adhesive sequences, such as the Arg-Gly-Asp (RGD) motif, represents a promising strategy to control biological interactions at the cell-material interface. These peptides are known to improve the tissue-material contact owing to highly specific binding to cellular membrane receptors known as integrins, thereby promoting the adhesion, migration and proliferation of cells. The peptides were coupled to borosilicate glass and titanium surfaces using silanisation chemistry. A tryptophan residue was incorporated into the amino acid sequences of selected peptides to facilitate the detection of the covalently bound peptides. Successful peptide immobilisation was proven by fluorimetric measurements. The confocal imaging analysis suggests a homogeneous distribution of the immobilised peptide across the biomaterial surface. In vitro cell proliferation assays were employed to compare the adhesion potentials of the well-known RGD-containing peptides GRGDSP, GRADSP and RGDS to the three peptides designed by our group. The results demonstrate that the RGD sequence is not necessarily required to enhance the adhesion of cells to non-biological surfaces. Moreover, it is shown that the number of adhering cells can be increased by changes in the peptide hydrophobicity. Changes in the cytoskeleton are observed depending on the type of RGD-peptide modification.
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Affiliation(s)
- N Senyah
- Department of Biomaterials, Institute for Bioprocessing and Analytical Measurement Techniques e.V. (iba), Rosenhof, 37308 Heilbad Heiligenstadt, Germany
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9
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Hildebrand G, Kunze S, Driver M. Blood cell adhesion on sensor materials studied by light, scanning electron, and atomic-force microscopy. Ann Biomed Eng 2001; 29:1100-5. [PMID: 11853262 DOI: 10.1114/1.1424919] [Citation(s) in RCA: 5] [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: 11/24/2022]
Abstract
Unwanted interactions of biomedical sensors with surrounding tissues, body fluids, and cells are one of the most crucial problems affecting their long-term stability. In vivo processes were simulated in a computer-controlled bioreactor connected to a flow chamber system. Optical sensor materials were inserted into a parallel-plate chamber and monitored by light microscopy in order to get information about the number of adhered cells. Tests with thrombocyte-enriched plasma show that novel phosphorylcholine (PC)-polymer-coated sensors appear to be more bioinert, and thus demonstrate better haemocopatibility in comparison with untreated glass sensors. The influence of different materials on the morphology of adhered cells was investigated by off-line methods such as scanning electron microscopy (SEM) and atomic-force microscopy (AFM). SEM showed a reduction in the number of adhered thrombocytes and the lack of any fibrin network on the PC-polymer-modified glass surface, in contrast to the pure glass surface. AFM gives topographical information, and the calculated contact areas and cell volumes indicate smaller interactions between cells and sensor material in the case of PC-polymer-coated sensors.
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Affiliation(s)
- G Hildebrand
- Institute for Bioprocessing and Analytical Measurement Techniques e.V., Heilbad Heiligenstadt, Germany.
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10
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Navarro F, Orellana G, Moreno-Bondi MC, Vick T, Driver M, Hildebrand G, Liefeith K. Fiber-optic luminescent sensors with composite oxygen-sensitive layers and anti-biofouling coatings. Anal Chem 2001; 73:5150-6. [PMID: 11721912 DOI: 10.1021/ac015517n] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [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: 11/30/2022]
Abstract
Anti-biofouling polymers containing phosphorylcholine (PC)-substituted methacrylate units have been prepared by copolymerization with dodecyl methacrylate and used to coat luminescent oxygen sensors. Nanometer-sized coatings of such materials are shown to reduce significantly the adhesion of marine bacteria (more than 70%) and thrombocytes (more than 90%) to the surface of tris-(4,7-diphenyl-1,10-phenanthroline)ruthenium(II)-doped silicone layers. A thorough analytical characterization of both the PC-coated and the uncoated dyed films has demonstrated that the anti-biofouling layers do not alter dramatically the performance of the fiber-optic oxygen sensors in aqueous media and are mechanically stable for more than one year of continuous immersion. The slope of the linear calibration plots in the 0-8 mg L(-1) oxygen concentration range (ca. 1.0 L mg(-1)) decreases 8-11% after applying the 50-nm protective layer with no change in the sensor precision (1.1-1.9% RSD, n = 6). The response time of the 200-microm O2-sensitive layers (1.5-6 min) increases up to 2-fold, depending on the nature of the PC polymer used, but the temperature effect on the sensor response (0.020 L mg(-1) degrees C(-1)) remains essentially unchanged. Oxygen detection limits as low as 0.04 mg L(-1) have been measured with the coated optodes. The novel biofouling-resistant optosensors have been successfully validated against a commercial oxygen electrode and are shown to respond faster than the electrochemical device for large oxygen concentration changes. The biomimetic coatings will be particularly useful for drift-free long-term operation of environmental optosensors and in vivo fiber-optic oxygen analyzers.
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Affiliation(s)
- F Navarro
- Department of Organic Chemistry, Universidad Complutense de Madrid, Spain
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11
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Hildebrand G, Liefeith K, Hofinger J. IN-VITRO BIOKOMPATIBILITÄTSUNTERSUCHUNGEN AN ELEKTROCHEMISCH ABGESCHIEDENEN CA/P-SCHICHTEN. BIOMED ENG-BIOMED TE 2000. [DOI: 10.1515/bmte.2000.45.s1.115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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12
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Schoenen J, Bulcke J, Caekebeke J, Dehaene I, De Keyser J, Hildebrand G, Joffroy A, Laloux P, Louis P, Monseu G. Self-treatment of acute migraine with subcutaneous sumatriptan using an auto-injector device: comparison with customary treatment in an open, longitudinal study. Cephalalgia 1994; 14:55-63. [PMID: 8200027 DOI: 10.1046/j.1468-2982.1994.1401055.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
In a multicenter open longitudinal clinical trial where 479 patients suffering from migraine with or without aura were recruited, patients treated at home one to three migraine attacks with their customary treatment, and subsequently, over a 3-month period, one to three migraine attacks with 6 mg sumatriptan sc using an autoinjector. The headache response to customary treatment was 19% at 1 h and 30.5% at 2 h, and was not significantly different when only attacks treated "adequately" according to accepted treatment recommendations were considered: 16% at 1 h and 35% at 2 h. In contrast, 69% and 82% of patients treated with 6 mg sumatriptan sc had mild headache or no headache at 1 and 2 h respectively, regardless of migraine type or duration of symptoms prior to treatment. Other migraine symptoms (nausea, vomiting, photo- and phonophobia) were effectively treated with sumatriptan. Recurrence of migraine was observed in 31% of patients and was well controlled by a second injection of sumatriptan. It is concluded that 6 mg sumatriptan sc, self-administered using an autoinjector, is well tolerated and more effective than most currently used acute treatments for migraine in a population of severely affected patients consulting a neurologist.
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Affiliation(s)
- J Schoenen
- University Department of Neurology, CHR Citadelle, Liège, Belgium
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13
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Lenzen J, Hildebrand G, Laun A, Stracke H, Müller H, Schatz H. Function tests on the neuroendocrine hypothalamo-pituitary system following acute midbrain syndrome, with special reference to computertomographical and magnetic resonance imaging results. Neurosurg Rev 1993; 16:183-7. [PMID: 8272206 DOI: 10.1007/bf00304325] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Seventeen patients underwent a neuroendocrinological function test at a mean 6.3 years following a severe craniocerebral trauma (CCT) accompanied by midbrain syndrome. An insulin hypoglycaemia test (IHT) and the combined pituitary anterior lobe test (CPALT) were applied. Whereas the IHT as maximum stimulator of the hypothalamo-pituitary system (HPS) showed an adequate reserve capacity, the CPALT yielded a partial limitation of the secretion dynamic in the somatotropic, adrenocorticotropic axis as well as a dysfunction in the FSH secretion. Neuroradiological tests could not establish substantial injury in the regio hypothalamica in any patient.
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Affiliation(s)
- J Lenzen
- Department of Neurosurgery, Justus Liebig University, Giessen, Fed. Rep. of Germany
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14
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Abstract
We have examined two T lymphocyte cell surface molecules, CD4 and CD7, as targets for specific delivery of drugs from antibody-directed liposomes. The efficiency of uptake by peripheral lymphocytes, thymocytes, and two CEM sublines (CEM.MRS and CEM-T4) of anti-CD4 and anti-CD7 liposomes containing methotrexate was evaluated by the methotrexate-mediated inhibition of the incorporation of d-[3H]Urd into DNA. This was compared with similar liposomes targeted to MHC-encoded HLA class I molecules, which are known to be efficiently taken up by T cells. Despite the lower expression of CD7 molecules relative to HLA class I on most cell lines, CD7 was shown to be a good target for drug delivery. The results of an internalization study using radiolabeled Protein A showed that a higher proportion of CD7 molecules was internalized than HLA class I molecules. CD4-targeted liposomes, in contrast, were relatively ineffective for drug delivery for lymphoid cells, and only partially inhibited CEM-T4 cells. The lack of toxicity correlated with poor internalization of the target molecule on most cell lines. The drug effect of anti-CD4 liposomes was more pronounced on HeLa-T4, which is an epithelial cell line transfected with the CD4 gene. In contrast to lymphoid cells, these cells efficiently internalized CD4 molecules. PMA is known to down-regulate surface expression of CD4 molecules on various T cells. Internalization of CD4 was induced by PMA, but PMA failed to induce cytotoxicity of CD4-targeted liposomes for CEM.MRS. The internalized drug was probably degraded rapidly because internalized anti-CD4 antibody-bound Protein A was degraded very rapidly.
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Affiliation(s)
- H Suzuki
- Centre d'Immunologie INSERM-CNRS de Marseille-Luminy, France
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Schmidt E, Racenberg E, Hildebrand G, Büch U. [Complications and risks of brachial plexus anaesthesia with special reference to long-term damage (author's transl)]. Anasth Intensivther Notfallmed 1981; 16:346-9. [PMID: 7325349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
During 1974-1978 620 regional anaesthesias involving the brachial plexus were performed. Three techniques, viz: supraclavicular, axillary, interscalene were employed. The data are analysed with a view to comparing the efficacy and safety of the techniques with a special reference to long-term damage. Transient injury to the brachial plexus was observed in 3 of 342 patients who had Kulenkampff's supraclavicular plexus anaesthesia. After 3 months all after-effects had disappeared. Plexus block via the axillary route proved to be the safest technique. Detailed inquiries and follow-up examinations established that none of the techniques had caused irreversible damage to the brachial plexus.
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Dausch-Neumann D, Hildebrand G. Buchbesprechungen. J Orofac Orthop 1961. [DOI: 10.1007/bf02165807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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17
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Leibnitz E, Hager W, Berthold P, Hildebrand G. Studien zur Chemie der Paraffine und Paraffinmassen. I. Bestimmung von Paraffinen, Olefinen und Naphthenen in Folgeprodukten der Braunkohlenteerdestillation. ACTA ACUST UNITED AC 1958. [DOI: 10.1002/prac.19580070108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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18
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Hildebrand G. Depressorische Adrenalinwirkung und Adrenalinumkehr. Naunyn Schmiedebergs Arch Pharmacol 1952. [DOI: 10.1007/bf00250127] [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: 11/28/2022]
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