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Tascilar K, Fagni F, Kleyer A, Bayat S, Heidemann R, Steiger F, Krönke G, Bohr D, Ramming A, Hartmann F, Klett D, Federle A, Regensburger AP, Wagner AL, Knieling F, Neurath MF, Schett G, Waldner M, Simon D. Non-invasive metabolic profiling of inflammation in joints and entheses by multispectral optoacoustic tomography. Rheumatology (Oxford) 2023; 62:841-849. [PMID: 35699479 DOI: 10.1093/rheumatology/keac346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 06/10/2022] [Accepted: 06/10/2022] [Indexed: 02/04/2023] Open
Abstract
OBJECTIVE To explore the metabolic characteristics of arthritis and enthesitis using multispectral opto-acoustic tomography (MSOT), a technology using near-infrared multispectral laser to stimulate tissues and detect the emitted acoustic energy, enabling non-invasive quantification of tissue components in vivo based on differential absorbance at multiple wavelengths. METHODS We performed a cross-sectional study in patients with RA or PsA and healthy controls (HCs). Participants underwent clinical, ultrasonographic and MSOT examination of MCP and wrist joints as well as the entheses of the common extensor tendon at the lateral humeral epicondyles and of the patellar, quadriceps and Achilles tendon. MSOT-measured haemoglobin (Hb), oxygen saturation, collagen and lipid levels were quantified and scaled mean differences between affected and unaffected joints and entheses were calculated as defined by clinical examination or ultrasonography using linear mixed effects models. RESULTS We obtained 1535 MSOT and 982 ultrasonography scans from 87 participants (34 PsA, 17 RA, 36 HCs). Entheseal tenderness was not associated with significant metabolic changes, whereas enthesitis-related sonographic changes were associated with increased total Hb, oxygen saturation and collagen content. In contrast, the presence of arthritis-related clinical and sonographic findings showed increased Hb levels, reduced oxygen saturation and reduced collagen content. Synovial hypertrophy was associated with increased lipid content in the joints. CONCLUSION MSOT allows determination of distinct metabolic differences between arthritis and enthesitis in a non-invasive setting in humans in vivo.
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Affiliation(s)
- Koray Tascilar
- Department of Internal Medicine 3.,Deutsches Zentrum fuer Immuntherapie
| | - Filippo Fagni
- Department of Internal Medicine 3.,Deutsches Zentrum fuer Immuntherapie
| | - Arnd Kleyer
- Department of Internal Medicine 3.,Deutsches Zentrum fuer Immuntherapie
| | - Sara Bayat
- Department of Internal Medicine 3.,Deutsches Zentrum fuer Immuntherapie
| | - Robert Heidemann
- Department of Internal Medicine 3.,Deutsches Zentrum fuer Immuntherapie
| | - Florian Steiger
- Department of Internal Medicine 3.,Deutsches Zentrum fuer Immuntherapie
| | - Gerhard Krönke
- Department of Internal Medicine 3.,Deutsches Zentrum fuer Immuntherapie
| | - Daniela Bohr
- Department of Internal Medicine 3.,Deutsches Zentrum fuer Immuntherapie
| | - Andreas Ramming
- Department of Internal Medicine 3.,Deutsches Zentrum fuer Immuntherapie
| | - Fabian Hartmann
- Department of Internal Medicine 3.,Deutsches Zentrum fuer Immuntherapie
| | - Daniel Klett
- Deutsches Zentrum fuer Immuntherapie.,Department of Internal Medicine 1, Friedrich-Alexander University Erlangen-Nuremberg and Universitätsklinikum Erlangen, Erlangen, Germany
| | - Anna Federle
- Deutsches Zentrum fuer Immuntherapie.,Department of Internal Medicine 1, Friedrich-Alexander University Erlangen-Nuremberg and Universitätsklinikum Erlangen, Erlangen, Germany
| | - Adrian P Regensburger
- Deutsches Zentrum fuer Immuntherapie.,Department of Pediatrics and Adolescent Medicine
| | - Alexandra L Wagner
- Deutsches Zentrum fuer Immuntherapie.,Department of Pediatrics and Adolescent Medicine
| | - Ferdinand Knieling
- Deutsches Zentrum fuer Immuntherapie.,Department of Pediatrics and Adolescent Medicine
| | - Markus F Neurath
- Deutsches Zentrum fuer Immuntherapie.,Department of Internal Medicine 1, Friedrich-Alexander University Erlangen-Nuremberg and Universitätsklinikum Erlangen, Erlangen, Germany
| | - Georg Schett
- Department of Internal Medicine 3.,Deutsches Zentrum fuer Immuntherapie
| | - Maximilian Waldner
- Deutsches Zentrum fuer Immuntherapie.,Department of Internal Medicine 1, Friedrich-Alexander University Erlangen-Nuremberg and Universitätsklinikum Erlangen, Erlangen, Germany
| | - David Simon
- Department of Internal Medicine 3.,Deutsches Zentrum fuer Immuntherapie
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Tascilar K, Fagni F, Kleyer A, Bayat S, Heidemann R, Steiger F, Krönke G, Bohr D, Ramming A, Hartmann F, Klett D, Federle A, Regensburger A, Wagner AL, Knieling F, Neurath MF, Schett G, Waldner M, Simon D. POS1384 NON-INVASIVE IN VIVO METABOLIC PROFILING OF INFLAMMATION IN JOINTS AND ENTHESES BY OPTOACOUSTIC IMAGING. Ann Rheum Dis 2022. [DOI: 10.1136/annrheumdis-2022-eular.1359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BackgroundAn in-depth metabolic characterization of joints and entheses at the tissue level can help in the early diagnosis and treatment selection for patients with inflammatory arthritis [1]. However, current knowledge about the metabolic profiles of synovitis and enthesitis is limited. Multispectral optoacoustic tomography (MSOT), a novel metabolic imaging technology, could be used to undertake metabolic profiling of joints and entheses non-invasively using near-infrared multispectral laser to stimulate tissues and detect the emitted acoustic energy, enabling quantification of tissue components in vivo based on differential absorbance at multiple wavelengths [2, 3].ObjectivesTo explore the metabolic characteristics of arthritis and enthesitis using MSOT.MethodsWe performed a cross sectional study on healthy controls (HC) and patients with rheumatoid arthritis (RA), psoriatic arthritis (PsA) (Table 1). Participants underwent clinical, ultrasound (US), and MSOT examination of metacarpophalangeal joints, wrists, entheses of lateral epicondyles, patellar, quadriceps and Achilles tendons. MSOT-derived hemoglobin, oxygen saturation, collagen and lipid levels were measured. We calculated scaled mean differences (SMD) between affected and unaffected joints and entheses as defined by clinical examination or US using linear mixed effects models.Table 1.Baseline characteristics.OverallHealthyPsARAN87363417Age, mean (SD)47.0 (15.7)34.7 (12.0)52.4 (11.5)62.5 (9.1)Sex, n (%) Female48 (55.2)18 (50.0)17 (50.0)13 (76.5) Male39 (44.8)18 (50.0)17 (50.0)4 (23.5)Tender joints, median (IQR)0 (0-2)0 (0-0)1 (0-5)2 (1-6)Swollen joints, median (IQR)0 (0-1)0 (0-0)0 (0-2)2 (1-6)Tender entheses, median (IQR)0 (0-2)0 (0-0)1 (0-3)0 (0-0)csDMARD, n (%)22 (25.3)-13 (38.3)9 (53.0)b-tsDMARD, n (%)31 (35.6)-20 (58.8)11 (64.7)SD, standard deviation; IQR, interquartile range; csDMARD, conventional synthetic disease modifying anti-rheumatic drug; b-tsDMARD, biologic or targeted synthetic disease modifying anti-rheumatic drug.ResultsWe obtained 1535 MSOT and 982 US scans from 87 participants (36 HC, 34 PsA, 17 RA). Entheseal tenderness was not associated with metabolic changes, whereas US enthesitis was associated with increased total hemoglobin, oxygen saturation and collagen content. In contrast, clinical and US arthritis showed increased hemoglobin levels but reduced oxygen saturation and reduced collagen content. Synovial hypertrophy was associated with increased lipid content in the joints (Figure 1).Figure 1.Scaled differences and 95% confidence intervals of MSOT-measured metabolite values by clinical and ultrasonographic findings of enthesitis (A-C) and arthritis (D-F). Two differences are plotted for each metabolite indicating two multispectral processing algorithms used for estimation. P values were adjusted for multiple testing using a false discovery rate of 5%. NS, not significant. sO2, oxygen saturation.ConclusionMSOT allows a non-invasive characterization of metabolic changes in arthritis and enthesitis. These findings can be interpreted as a reflection of increased synovial cellularity, collagen degradation, and metabolic demand in synovitis, and of an increased tissue apposition and vascularization in enthesitis. Our results suggest that synovitis and enthesitis do not only differ at the clinical and anatomical-functional level, but also exhibit divergent metabolic changes.References[1]Falconer J, et. al. Arthritis Rheumatol. 2018;70(7):984-99.[2]Regensburger AP, et. al. Biomedicines. 2021;9(5).[3]Regensburger AP, et al. Nature Medicine. 2019;25(12):1905-15.Conflict of InterestAR., FK, MW are co-inventors, together with iThera Medical GmbH, Germany on an EU patent application (no. EP 19 163 304.9) relating to a device and a method for analysis of optoacoustic data, an optoacoustic system and a computer program. All other authors declare no conflict of interest.AcknowledgementsWe thank Ms. Nairouz Al Ahmad, assistant medical technician (Department of Internal Medicine 3), for her assistance in conducting the study and Dr. Yi Qiu, PhD (iThera Medical GmbH) for her assistance in data analysis and interpretation.Disclosure of InterestsNone declared
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Schmidt M, Heidemann R, Michelson G, Knott M, Kloska S, Kimmlingen R, Engelhorn T, Dörfler A. DTI der Sehbahn bei 7 T: Machbarkeitsstudie und erste Ergebnisse bei Glaukompatienten. ROFO-FORTSCHR RONTG 2016. [DOI: 10.1055/s-0036-1581728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Heidemann R, Lütkemeyer D, Büntemeyer H, Lehmann J. Effects of dissolved oxygen levels and the role of extra- and intracellular amino acid concentrations upon the metabolism of mammalian cell lines during batch and continuous cultures. Cytotechnology 2012; 26:185-97. [PMID: 22358616 DOI: 10.1023/a:1007917409455] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The effects of dissolved oxygen and the concentration of essential amino acids upon the metabolism of two mammalian cell lines (rCHO producing human active (t-PA) and a mouse-mouse hybridoma) were investigated in batch, chemostat, and perfusion cultures. Intracellular amino acid concentrations were measured for both cell lines during repeated batch cultures and the K(S)-values for the essential amino acids were calculated using Monod equations via computer simulation. The K(S)-values were in the range of 10 mmol L(-1) and the pool of most intracellular amino acids remained constant at about 10-100 fold higher in concentration than in the medium. No significant differences were observed between the hybridoma and CHO cell. The specific nutrient uptake rates corresponded with the cell specific growth rate and the effects of reduced dissolved oxygen concentrations only became evident when the DO dropped below 5% of air saturation (critical concentration below 1%). Nevertheless, a correlation between nutrient concentration and specific oxygen uptake was detected.
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Heidemann R, Zhang C, Qi H, Larrick Rule J, Rozales C, Park S, Chuppa S, Ray M, Michaels J, Konstantinov K, Naveh D. The use of peptones as medium additives for the production of a recombinant therapeutic protein in high density perfusion cultures of mammalian cells. Cytotechnology 2011; 32:157-67. [PMID: 19002977 DOI: 10.1023/a:1008196521213] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Protein hydrolysates as substitutes for serum havebeen employed by many in cell culture mediumformulation, especially with the shift to low proteinor protein-free media. More recently, vegetablehydrolysates have also been added as nutritionalsupplements to fortify the amino acid content in smallpeptide form for batch and fed-batch fermentations. Several of these new hydrolysates (peptones of soy,rice, wheat gluten etc.) were tested as protein-freemedium supplements for the production of a recombinanttherapeutic protein. Multiple peptone-supplemented,continuous perfusion bioreactor experiments wereconducted, varying dilution rates and basal mediumcomposition over the various runs. Cell specificrates and product quality studies were obtained forthe various peptones and compared with peptone-freemedium. The potential for peptones to decreaseintrinsic and proteolytic degradation of the productwas also investigated.It was found that peptones confer a nutritionalbenefit, especially at low dilution rates, for therecombinant BHK cell line used in this investigation.The specific productivity increased 20-30% comparedto the peptone-free controls. However, this benefitwas also fully delivered by using fortified medium inplace of the peptone-enriched media. Therefore, whilepeptones may be considered as useful medium additiveswhen development time is limited, their addition maybe avoided by systematic medium development ifpermitted by the time line of the project.
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Affiliation(s)
- R Heidemann
- Bayer Corporation, 800 Dwight Way, P.O. Box 1686, Berkeley, CA, 94701, USA,
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Munzert E, Heidemann R, Büntemeyer H, Lehmann J, Müthing J. Production of recombinant human antithrombin III on 20-L bioreactor scale: correlation of supernatant neuraminidase activity, desialylation, and decrease of biological activity of recombinant glycoprotein. Biotechnol Bioeng 2010; 56:441-8. [PMID: 18642246 DOI: 10.1002/(sici)1097-0290(19971120)56:4<441::aid-bit9>3.0.co;2-o] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Chinese hamster ovary (CHO) cells producing the recombinant glycoprotein human antithrombin III (rhAT III) were batch cultivated in a 20-L bioreactor for 13 days. Neuraminidase activity in cell-free supernatant was monitored during cultivation and free sialic acid was determined by HPLC. Neu5Acalpha(2-->3)Gal-specific Maackia amurensis and Galbeta(1-->4)GlcNAc-specific Datura stramonium agglutinin were used for determination of sialylated and desialylated rhAT III, respectively. A commercial test kit was used for evaluation of functional rhAT III activity. Supernatant neuraminidase as well as lactate dehydrogenase activity increased significantly during batch growth. The enhanced number of dead cells correlated with increased neuraminidase activity, which seemed to be principally due to cell lysis, resulting in release of cytosolic neuraminidase. Loss of terminally alpha(2-->3) linked sialic acids of the oligosaccharide portions of rhAT III, analyzed in lectin-based Western blot and lectin-adsorbent assays, correlated with a decrease of activity of rhAT III produced throughout long-term batch cultivation. Thus, structural oligosaccharide integrity as well as the functional activity of recombinant glycoprotein depend on the viability and mortality of the bioreactor culture, and batches with a high number of viable cells are required to guarantee production of glycoproteins with maximum biological activity. (c) 1997 John Wiley & Sons, Inc. Biotechnol Bioeng 56: 441-448, 1997.
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Affiliation(s)
- E Munzert
- Institute of Cell Culture Technology, University of Bielefeld, D-33501 Bielefeld, Germany
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Trampel R, Heidemann R, Ivanov D, Turner R. Anatomical Identification of V5 in Humans at 7 T. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70449-5] [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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Heidemann R, Zhdanov S, Sütterlin R, Thomas HM, Morfill GE. Dissipative dark soliton in a complex plasma. Phys Rev Lett 2009; 102:135002. [PMID: 19392363 DOI: 10.1103/physrevlett.102.135002] [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] [Subscribe] [Scholar Register] [Received: 08/29/2008] [Indexed: 05/27/2023]
Abstract
The observation of a dark soliton in a three-dimensional complex plasma containing monodisperse microparticles is presented. We perform our experiments using neon gas in the bulk plasma of an rf discharge. A gas temperature gradient of 500K/m is applied to balance gravity and to levitate the particles in the bulk plasma. The wave is excited by a short voltage pulse on the electrodes of the radio frequency discharge chamber. It is found that the wave propagates with constant speed. The propagation time of the dark soliton is approximately 20 times longer than the damping time.
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Affiliation(s)
- R Heidemann
- Max-Planck-Institut für extraterrestrische Physik, 85740 Garching, Germany
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Geier O, Heidemann R, Hahn D, Köstler H. Schnelle GRAPPA-Rekonstruktion für PLANED (Parallele Aufnahme zur effektiven dichte-gewichteten) Bildgebung. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976819] [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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Jakob PM, Griswold M, Hillenbrand C, Heidemann R, Hahn D, Haase A. High speed and high resolution cardiac MRI (parallel acquisition techniques & modular imaging). MAGMA 2000; 11:52-4. [PMID: 11186987 DOI: 10.1007/bf02678494] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- P M Jakob
- Lehrstuhl für Experimentelle Physik, University of Würzburg, Germany.
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Schneider T, Heidemann R, Epe C, Stoye M. Investigations into the efficacy of doramectin on reactivated somatic larvae of Ancylostoma caninum Ercolani 1859 (Ancylostomatidae) in pregnant bitches. Zentralbl Veterinarmed B 1994; 41:603-7. [PMID: 7740860 DOI: 10.1111/j.1439-0450.1994.tb00270.x] [Citation(s) in RCA: 6] [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] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The aim of this investigation was to examine whether reactivated somatic Ancylostoma caninum larvae can be eliminated by the administration of doramectin to pregnant bitches. Four pregnant bitches experimentally infected with 20,000 third-stage larvae of A. caninum were treated subcutaneously with 1 mg doramectin per kg body weight on day 55 of the pregnancy (5-8 days before parturition). Another four experimentally infected pregnant bitches served as controls. The single doramectin treatment completely prevented galactogenic infections in the puppies. Neither intestinal stages nor somatic larvae could be found. The administration of doramectin caused no local or generalized side-effects in the bitches. All 16 puppies of the treated bitches were born healthy and remained so during the whole trial period. Beginning during the third week after birth, all 20 puppies of the untreated bitches developed a severe microcytic, hypochromic anaemia. They had to be killed between 17 and 35 days after birth. Post mortem, they revealed a total of 8649 intestinal stages of A. caninum.
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Affiliation(s)
- T Schneider
- Institute of Parasitology, School of Veterinary Medicine, Hannover, Germany
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Riese U, Lütkemeyer D, Heidemann R, Büntemeyer H, Lehmann J. Re-use of spent cell culture medium in pilot scale and rapid preparative purification with membrane chromatography. J Biotechnol 1994; 34:247-57. [PMID: 7764958 DOI: 10.1016/0168-1656(94)90060-4] [Citation(s) in RCA: 18] [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: 01/27/2023]
Abstract
Based on experiments in bench scale, a recycling of spent cell culture medium was performed in a 100-1 pilot scale bioreactor. The cell cultivation has been done as a repeated batch procedure after the initial batch in the following four repeated batches spent medium from the previous batch was partially re-used. After microfiltration and ultrafiltration a part of the filtrate was mixed with a concentrate of amino acids and glucose, sterile filtered and subsequently filled back into the bioreactor. Up to 65% of the harvested cell- and product-free spent medium was re-used in each repeated batch. This procedure results in a saving of pure and waste water volume and saving of supplemented proteins as transferrin, insulin and lipoproteins and, therefore, also in a reduction of the production costs. A strongly acidic membrane ion exchanger was evaluated for the ability to purify the monoclonal antibodies from the pilot scale cultivation. Within minutes, gram quantities of product could be purified in a high flux system, especially developed for this purpose, achieving purities of 80%. The capacity of the acidic membrane ion exchanger was found in former investigations to be 1 mg cm-2 with recoveries up to 96%. Final purification was carried out by gel column filtration.
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Affiliation(s)
- U Riese
- Institute for Cell Culture Technology, University of Bielefeld, Germany
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Heidemann R, Riese U, Lütkemeyer D, Büntemeyer H, Lehmann J. The Super-Spinner: a low cost animal cell culture bioreactor for the CO2 incubator. Cytotechnology 1994; 14:1-9. [PMID: 7765107 DOI: 10.1007/bf00772190] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.5] [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: 01/27/2023] Open
Abstract
The production of small quantities of monoclonal antibodies and recombinant proteins was carried out using a new low cost production system, the Super Spinner. Into a 1 1 standard Duran flask a membrane stirrer equipped with a polypropylene hollow fiber membrane was installed to improve the oxygen supply by bubble-free aeration. The aeration was facilitated by using the CO2 conditioned incubator gas, which was pumped through the membrane stirrer via a small membrane pump. The maximal oxygen transfer rate (OTRmax) of the Super Spinner was detected. For this purpose one spinner flask was equipped with an oxygen electrode. The OTRmax was measured by the dynamic method. The ratio of membrane length to culture volume was adapted corresponding to the oxygen uptake rate of the cells according to the desired cell density. A balanced nutrient supply resulted in an optimal formation and yield of products.
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Affiliation(s)
- R Heidemann
- Institute for Cell Culture Technology, University of Bielefeld, Germany
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Riese U, Lütkemeyer D, Heidemann R, Büntemeyer H, Lehmann J. Entwicklung einer Pilot-Anlage zur Medium-Recyclisierung im 100-I-Maßstab für die Kultivierung tierischer Zellen. CHEM-ING-TECH 1992. [DOI: 10.1002/cite.3306409157] [Citation(s) in RCA: 1] [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: 11/09/2022]
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Schneider W, Menke G, Heidemann R, Satter P, Kaltenbach M, Rietbrock N. Concentrations of isosorbide dinitrate, isosorbide-2-mononitrate and isosorbide-5-mononitrate in human vascular and muscle tissue under steady-state conditions. Eur J Clin Pharmacol 1990; 38:145-7. [PMID: 2338111 DOI: 10.1007/bf00265973] [Citation(s) in RCA: 6] [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: 12/31/2022]
Abstract
The concentrations of isosorbide dinitrate (ISDN), isosorbide-5-mononitrate (IS-5-MN) and isosorbide-2-mononitrate (IS-2-MN) were determined in plasma (PL), saphenous vein wall (SV) and pectoral muscle (PM) from 8 patients undergoing coronary bypass surgery. The patients were pretreated for 2 days with ISDN 240 mg per day (standard release formulation) in 4 doses of 40 mg and one dose of 80 mg. The plasma and tissue samples were obtained during the operation, 10-12 h after the last dose. Isosorbide-2-mononitrate and isosorbide-5-mononitrate were present in plasma and tissues in the same concentration ranges with molar concentration ratios of 0.88 (IS-2-MN: PM/PL), 0.85 (IS-5-MN: PM/PL), 0.99 (IS-2-MN: SV/PL) and 1.06 (IS-5-MN: SV/PL). Mean ISDN concentrations in tissue were considerably higher than in plasma; the molar concentration ratios were 4.9 (SM/PL) and 7.21 (SV/PL). The accumulation of ISDN in vessel walls may contribute to its greater vascular action compared to the mononitrates, but it may also facilitate the development of tolerance during long-term treatment.
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Affiliation(s)
- W Schneider
- Division of Cardiology, University Hospital Frankfurt a.M., Federal Republic of Germany
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Heidemann R, Gracien E, Menke G, Rietbrock N. [Bioavailability of delayed-action and non-delayed-action preparations of isosorbide-5-nitrate]. Dtsch Med Wochenschr 1987; 112:719-22. [PMID: 3569063 DOI: 10.1055/s-2008-1068127] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
In a randomized crossover study on twelve healthy test subjects, the plasma concentration of isosorbide-5-nitrate (IS-5-N) after oral administration of 40 mg IS-5-N daily from two standard preparations (two tablets Ismo 20 or Corangin 20) and two sustained release preparations with 40 mg or 60 mg IS-5-N (one tablet Corangin 40 or Corangin 60) once a day was determined. The concentrations were measured in the first and in the third dose interval (24 hours). The respective pharmacokinetic parameters (AUC, Cmax and tmax) of the first and the third day only differed slightly. The two standard formulations proved to be bioequivalent. With the two sustained release preparations, maximum plasma concentrations attained after five to six hours were measured which were lower by roughly the factor 2. The sustained release preparations showed a low loss of bioavailability of 13-19% as compared to the nonretarded standard formulations.
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Heidemann R, Beckenbauer C, Woodcock BG. Effect of posture on glyceryl trinitrate plasma concentrations following transdermal application. Br J Clin Pharmacol 1987; 23:246-7. [PMID: 3103666 PMCID: PMC1386078 DOI: 10.1111/j.1365-2125.1987.tb03039.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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Heidemann R, Weijmar schultz WC, Aarnoudse JG. [Subjective experiences following episiotomy]. Ned Tijdschr Geneeskd 1986; 130:273. [PMID: 3951630] [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: 01/08/2023]
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Heidemann R, Menke G, Letzel H, Rietbrock N. [Serum concentration of glyceryl trinitrate (GTN) in transdermal application of GTN dressings of various origins]. Dtsch Med Wochenschr 1985; 110:1568-72. [PMID: 3930197 DOI: 10.1055/s-2008-1069048] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Serum levels of glyceryl trinitrate have been determined in eight healthy subjects following transdermal application of four different glyceryl trinitrate plasters using a randomised crossover design. The plasters investigated were Deponit 10, Nitradisc 10, Nitroderm TTS 10 and Nitro-Pflaster-ratiopharm 10. The medians of serum concentrations arranged in decreasing order were 0.17-0.23 ng/ml for Nitroderm TTS 10, 0.13-0.21 ng/ml for Nitradisc 10, 0.08-0.13 ng/ml for Deponit 10, and 0.04-0.09 ng/ml for Nitro-Pflaster-ratiopharm 10. Corresponding areas under the concentration-time curves (AUC 0-24) were 23.15 nmol . h/l (Nitroderm TTS), 20.32 nmol . h/l (Nitradisc), 10.39 nmol . h/l (Deponit), and 5.7 nmol . h/l (Nitro-Pflaster-ratiopharm).
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