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Csiki I, Glenn J, Schanzer J, Tuan B, Huang N, Dong A, John E, O'Toole L, Seppa J, Hawley R, Exon C, Klumpp K. 169P Immunomodulatory effects of RBS2418, an oral ENPP1 inhibitor in combination with pembrolizumab in checkpoint-refractory metastatic adrenal cancer. Immuno-Oncology and Technology 2022. [DOI: 10.1016/j.iotech.2022.100281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Wünsch I, Henrik Finke J, John E, Juhnke M, Kwade A. Influence of the drug deformation behaviour on the predictability of compressibility and compactibility of binary mixtures. Int J Pharm 2022; 626:122117. [PMID: 35985527 DOI: 10.1016/j.ijpharm.2022.122117] [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: 04/16/2022] [Revised: 08/06/2022] [Accepted: 08/11/2022] [Indexed: 10/15/2022]
Abstract
Various studies investigate the predictability of the compressibility and compactibility of tablet formulations based on the behaviour of the pure materials. However, these studies are limited to a few materials so far probably because of the complexity of the powder compaction process. One approach preventing the excessive increase in complexity is the extension of the investigations from pure materials to binary powder mixtures. The focus of this study is on the predictability of the compressibility and compactibility of binary mixtures consisting of an active pharmaceutical ingredient (API) and the excipient microcrystalline cellulose. Three APIs with markedly different deformation behaviour were used. The API concentration and type are systematically varied. For all three material combinations it is found that the in-die compressibility of the binary mixtures can be precisely predicted based on the characteristic compression parameters of the raw materials using the extended in-die compression function in combination with a volume-based linear mixing rule. Since the tablet porosity (out-of-die) also follows a linear mixing rule, the predictability can be further extended using the method of Katz et al. In contrast, the influence of the API concentration on compactibility or rather on tablet tensile strength is non-linear and strongly dependent on the deformation behaviour of the API, making the predictability more difficult. Neither the approach of Reynolds et al. nor this of Kuentz and Leuenberger are able to predict the compactibility when clear deviations from a linear mixing rule appear.
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Affiliation(s)
- Isabell Wünsch
- Technische Universität Braunschweig, Institute for Particle Technology, Volkmaroder Straße 5, 38104, Braunschweig, Germany; Technische Universität Braunschweig, Center of Pharmaceutical Engineering (PVZ), Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany
| | - Jan Henrik Finke
- Technische Universität Braunschweig, Institute for Particle Technology, Volkmaroder Straße 5, 38104, Braunschweig, Germany; Technische Universität Braunschweig, Center of Pharmaceutical Engineering (PVZ), Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany
| | | | | | - Arno Kwade
- Technische Universität Braunschweig, Institute for Particle Technology, Volkmaroder Straße 5, 38104, Braunschweig, Germany; Technische Universität Braunschweig, Center of Pharmaceutical Engineering (PVZ), Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany
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Wewers M, Finke JH, Czyz S, Van Eerdenbrugh B, John E, Büch G, Juhnke M, Bunjes H, Kwade A. Evaluation of the Formulation Parameter-Dependent Redispersibility of API Nanoparticles from Fluid Bed Granules. Pharmaceutics 2022; 14:pharmaceutics14081688. [PMID: 36015314 PMCID: PMC9414476 DOI: 10.3390/pharmaceutics14081688] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 08/08/2022] [Accepted: 08/11/2022] [Indexed: 12/05/2022] Open
Abstract
The production of nanosuspensions of poorly soluble active pharmaceutical ingredients (API) is a popular technique to counteract challenges regarding bioavailability of such active substances. A subsequent drying of the nanosuspensions is advantageous to improve the long-term stability and the further processing into solid oral dosage forms. However, associated drying operations are critical, especially with regard to nanoparticle growth, loss in redispersibility and associated compromised bioavailability. This work extends a previous study regarding the applicability of an API (itraconazole) nanosuspension as a granulation liquid in a fluidized bed process with focus on the influence of applied formulation parameters on the structure of obtained nanoparticle-loaded granules and their nanoparticle redispersibility. Generally, a higher dissolution rate of the carrier material (glass beads, lactose, mannitol or sucrose) and a higher content of a matrix former/hydrophilic polymer (PVP/VA or HPMC) in the granulation liquid resulted in the formation of coarser and more porous granules with improved nanoparticle redispersibility. HPMC was found to have advantages as a polymer compared with PVP/VA. In general, a better redispersibility of the nanoparticles from the granules could be associated with better dispersion of the API nanoparticles at the surface of the granules as deduced from the thickness of nanoparticle-loaded layers around the granules. The layer thickness on granules was assessed by means of confocal Raman microscopy. Finally, the dispersion of the nanoparticles in the granule layers was exemplarily described by calculation of theoretical mean nanoparticle distances in the granule layers and was correlated with data obtained from redispersibility studies.
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Affiliation(s)
- Martin Wewers
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Str. 5, 38104 Braunschweig, Germany
- Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, 38106 Braunschweig, Germany
| | - Jan Henrik Finke
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Str. 5, 38104 Braunschweig, Germany
- Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, 38106 Braunschweig, Germany
- Correspondence:
| | - Stefan Czyz
- Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, 38106 Braunschweig, Germany
- Institute of Pharmaceutical Technology and Biopharmaceutics, Technische Universität Braunschweig, Mendelssohnstr. 1, 38106 Braunschweig, Germany
| | | | - Edgar John
- Novartis Pharma AG, 4002 Basel, Switzerland
| | - Guido Büch
- Novartis Pharma AG, 4002 Basel, Switzerland
| | | | - Heike Bunjes
- Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, 38106 Braunschweig, Germany
- Institute of Pharmaceutical Technology and Biopharmaceutics, Technische Universität Braunschweig, Mendelssohnstr. 1, 38106 Braunschweig, Germany
| | - Arno Kwade
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Str. 5, 38104 Braunschweig, Germany
- Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, 38106 Braunschweig, Germany
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Bonhoeffer B, Kordikowski A, John E, Juhnke M. Numerical modeling of the dissolution of drug nanocrystals and its application to industrial product development. ADMET DMPK 2022; 10:253-287. [PMID: 36578561 PMCID: PMC9793462 DOI: 10.5599/admet.1437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 08/02/2022] [Indexed: 02/01/2023]
Abstract
The apparent solubility of drug nanocrystals in equilibrium was experimentally determined for a drug-stabilizer system with different particle size distributions. True supersaturation was identified for ultrafine drug nanocrystals with an almost 2-fold increase compared to the thermodynamic solubility of related coarse drug crystals, highlighting their enabling potential to enhance bioavailability. The experimental results were applied to investigate in silico the associated dissolution behavior in a closed system by numerical modeling according to the Ostwald-Freundlich and Noyes-Whitney / Nernst-Brunner equations. Calculated results were found to be in agreement with the experimental results only when the entire particle size distribution of drug nanocrystals was considered. In silico dissolution, studies were conducted to simulate the complex interplay between drug nanocrystals, dissolution conditions and resulting temporal progression during dissolution up to the equilibrium state. Calculations were performed for selected in vivo and in vitro scenarios considering different drug nanocrystal particle size distributions, drug amount, dissolution media and volume. The achieved results demonstrated the importance of ultrafine drug nanocrystals for potential bioavailability improvement and the functional applicability of the modeling approach to investigate their dissolution behavior for configurable formulation variables in product development in terms of in vivo and in vitro relevant conditions.
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Balmana J, Fasching P, Delaloge S, Park Y, Eisen A, Bourgeois H, Kemp Z, Jankowski T, Sohn J, Aksoy S, Timcheva C, Park-Simon TW, Anton Torres A, John E, Baria K, Walker G, Gelmon K. 174P Clinical effectiveness and safety of olaparib in BRCA-mutated, HER2-negative metastatic breast cancer in a real-world setting: Phase IIIb LUCY final analysis. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.03.193] [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: 11/01/2022] Open
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Puckhaber D, Finke JH, David S, Serratoni M, Zafar U, John E, Juhnke M, Kwade A. Prediction of the impact of lubrication on tablet compactibility. Int J Pharm 2022; 617:121557. [PMID: 35134481 DOI: 10.1016/j.ijpharm.2022.121557] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 01/28/2022] [Accepted: 02/02/2022] [Indexed: 11/18/2022]
Abstract
The tableting of most pharmaceutical formulations requires the addition of lubricants to reduce ejection forces, prevent tooling damage and tablet defects. The internal addition of lubricants is known to reduce tablet tensile strength, especially of mainly plastically deforming materials. To date, available models show only limited quantitative predictive accuracy for the influence of lubricant concentration on the mechanical strength of tablets. This study aims to fill this gap and present a model based on the Ryshkewitch-Duckworth equation that can estimate the compactibility profiles of lubricated formulations. Binary mixtures of different diluents (microcrystalline cellulose and lactose) were prepared with common lubricants (magnesium stearate and sodium stearyl fumarate) and subsequently tableted. The resulting compactibility profiles were fitted using the Ryshkewitch-Duckworth equation and the derived fit parameters (kb and σ0) were correlated with the lubricant concentration. Subsequently, an empirical model was established which requires a minimum of experimental data and is able to predict the tensile strength of lubricated diluent tablets. Consequently, the developed empirical model is an interesting and valuable addition to the existing multi-component compacting models available and offers the opportunity to accelerate experimentation in the development of new tablet formulations.
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Affiliation(s)
- Daniel Puckhaber
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Straße 5, 38104 Braunschweig, Germany; Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany.
| | - Jan Henrik Finke
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Straße 5, 38104 Braunschweig, Germany; Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany.
| | - Sarah David
- Novartis Pharma AG, Basel 4002, Switzerland.
| | | | - Umair Zafar
- Novartis Pharma AG, Basel 4002, Switzerland.
| | - Edgar John
- Novartis Pharma AG, Basel 4002, Switzerland.
| | | | - Arno Kwade
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Straße 5, 38104 Braunschweig, Germany; Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany.
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Wünsch I, Finke JH, John E, Juhnke M, Kwade A. The influence of particle size on the application of compression and compaction models for tableting. Int J Pharm 2021; 599:120424. [PMID: 33647406 DOI: 10.1016/j.ijpharm.2021.120424] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [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: 11/20/2020] [Revised: 02/03/2021] [Accepted: 02/20/2021] [Indexed: 10/22/2022]
Abstract
The physical characteristics of raw materials determine powder compression and compaction performance as relevant in pharmaceutical processes. For instance, the influence of initial particle size on powder compression and the resulting strength of specimen are highly complex and are still not sufficiently understood. Existing studies are often limited to materials with well-defined deformation behaviour, such as purely brittle or ductile. However, the deformation behaviour of active pharmaceutical ingredients (APIs) is often more complex. In this study, the influence of initial particle size on powder compressibility and compactibility is systematically characterized by consideration of in-die compressibility, specific energies, quick elastic recovery, tablet porosity and, tensile strength for the binder microcrystalline cellulose and three APIs. The decrease of particle size leads to an increase of the resistance against compression by trend and probably to a different contribution of the acting deformation mechanisms. The compactibility is increased with decreasing particle size because of the increasing number of bonds in a cross-sectional area of the tablet, as found by the application of the model of Rumpf. Furthermore, it is found that the model of Rumpf combined with the JKR model provides a meaningful property function to estimate tablet tensile strength.
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Affiliation(s)
- Isabell Wünsch
- Technische Universität Braunschweig, Institute for Particle Technology, Volkmaroder Straße 5, 38104 Braunschweig, Germany; Technische Universität Braunschweig, Center of Pharmaceutical Engineering (PVZ), Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany
| | - Jan Henrik Finke
- Technische Universität Braunschweig, Institute for Particle Technology, Volkmaroder Straße 5, 38104 Braunschweig, Germany; Technische Universität Braunschweig, Center of Pharmaceutical Engineering (PVZ), Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany.
| | | | | | - Arno Kwade
- Technische Universität Braunschweig, Institute for Particle Technology, Volkmaroder Straße 5, 38104 Braunschweig, Germany; Technische Universität Braunschweig, Center of Pharmaceutical Engineering (PVZ), Franz-Liszt-Straße 35A, 38106 Braunschweig, Germany
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Wewers M, Czyz S, Finke JH, John E, Van Eerdenbrugh B, Juhnke M, Bunjes H, Kwade A. Influence of Formulation Parameters on Redispersibility of Naproxen Nanoparticles from Granules Produced in a Fluidized Bed Process. Pharmaceutics 2020; 12:pharmaceutics12040363. [PMID: 32316108 PMCID: PMC7238015 DOI: 10.3390/pharmaceutics12040363] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [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: 02/28/2020] [Revised: 04/09/2020] [Accepted: 04/14/2020] [Indexed: 12/30/2022] Open
Abstract
The particle size reduction of active pharmaceutical ingredients is an efficient method to overcome challenges associated with a poor aqueous solubility. With respect to stability and patient's convenience, the corresponding nanosuspensions are often further processed to solid dosage forms. In this regard, the influence of several formulation parameters (i.e., type of carrier material, type and amount of additional polymeric drying excipient in the nanosuspension) on the redispersibility of naproxen nanoparticle-loaded granules produced in a fluidized bed process was investigated. The dissolution rate of the carrier material (i.e., sucrose, mannitol, or lactose) was identified as a relevant material property, with higher dissolution rates (sucrose > mannitol > lactose) resulting in better redispersibility of the products. Additionally, the redispersibility of the product granules was observed to improve with increasing amounts of polymeric drying excipient in the nanosuspension. The redispersibility was observed to qualitatively correlate with the degree of nanoparticle embedding on the surface of the corresponding granules. This embedding was assumed to be either caused by a partial dissolution and subsequent resolidification of the carrier surface dependent on the dissolution rate of the carrier material or by resolidification of the dissolved polymeric drying excipient upon drying. As the correlation between the redispersibility and the morphology of the corresponding granules was observed for all investigated formulation parameters, it may be assumed that the redispersibility of the nanoparticles is determined by their distance in the dried state.
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Affiliation(s)
- Martin Wewers
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Str. 5, 38104 Braunschweig, Germany
- Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, 38106 Braunschweig, Germany
| | - Stefan Czyz
- Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, 38106 Braunschweig, Germany
- Institute of Pharmaceutical Technology, Technische Universität Braunschweig, Mendelssohnstr. 1, 38106 Braunschweig, Germany
| | - Jan Henrik Finke
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Str. 5, 38104 Braunschweig, Germany
- Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, 38106 Braunschweig, Germany
| | - Edgar John
- Novartis Pharma AG, 4002 Basel, Switzerland
| | | | | | - Heike Bunjes
- Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, 38106 Braunschweig, Germany
- Institute of Pharmaceutical Technology, Technische Universität Braunschweig, Mendelssohnstr. 1, 38106 Braunschweig, Germany
| | - Arno Kwade
- Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Str. 5, 38104 Braunschweig, Germany
- Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, 38106 Braunschweig, Germany
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Crasto W, Morrison AE, Gray LJ, John E, Jarvis J, Brela J, Khunti K, Troughton J, Lawrence IG, McNally PG, Davies MJ. The Microalbuminuria Education Medication and Optimisation (MEMO) study: 4 years follow-up of multifactorial intervention in high-risk individuals with type 2 diabetes. Diabet Med 2020; 37:286-297. [PMID: 31505051 DOI: 10.1111/dme.14134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/05/2019] [Indexed: 11/30/2022]
Abstract
AIMS The Microalbuminuria Education Medication and Optimisation (MEMO) study, revealed improved cardiovascular risk and glycaemic control with 18 months of intensive multifactorial intervention in high-risk people with type 2 diabetes, without any increase in severe hypoglycaemia. Our aim was to assess longer-term outcomes at 4-year follow-up in these participants. METHODS Some 189 individuals with type 2 diabetes and microalbuminuria were recruited from a multi-ethnic population in Leicestershire, UK. The intervention group (n = 95) received multifactorial intervention with self-management education, and the control group (n = 94) received usual care. The primary outcome was change in HbA1c , and secondary outcomes were blood pressure (BP), cholesterol, microalbuminuria, estimated GFR, cardiovascular risk scores and major adverse cardiovascular events. RESULTS Some 130 participants (68.7%), mean (sd) age 60.8 (10.4) years, duration of diabetes 11.5 (9.7) years, completed 4 years of follow-up. Mean change [95% confidence intervals (CI)] in HbA1c over 4 years was greater with intensive intervention compared with control (-3 mmol/mol, 95% CI -4.95,-1.11; -0.4%, 95% CI -0.67,-0.15; P = 0.002). Significant improvements over the 4 years were also seen in systolic BP (-7.3 mmHg, 95% CI -11.1, -3.5; P < 0.001), diastolic BP (-2.9 mmHg, 95% CI -5.4, -0.3; P = 0.026), cholesterol (-0.3 mmol/l, 95% CI -0.52,-0.12; P = 0.002), and 10-year coronary heart disease (-5.3, 95% CI -8.2,-2.3; P < 0.001) and stroke risk (-4.4, 95% CI -7.5, -1.3; P < 0.001). CONCLUSION Multifactorial intervention with structured diabetes self-management education compared with usual diabetes care has benefits for cardio-metabolic risk factor profile. There was no increase in severe hypoglycaemia and cardiovascular mortality despite intensive glycaemic control, although the study was not powered to assess these outcomes.
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Affiliation(s)
- W Crasto
- Diabetes Research Centre, University of Leicester, Leicester, UK
| | - A E Morrison
- Leicester Diabetes Centre, University Hospitals of Leicester NHS Trust, Leicester, UK
| | - L J Gray
- Department of Health Sciences, University of Leicester, Leicester, UK
| | - E John
- Department of Health Sciences, University of Leicester, Leicester, UK
| | - J Jarvis
- Leicester Diabetes Centre, University Hospitals of Leicester NHS Trust, Leicester, UK
| | - J Brela
- Leicester Diabetes Centre, University Hospitals of Leicester NHS Trust, Leicester, UK
| | - K Khunti
- Diabetes Research Centre, University of Leicester, Leicester, UK
- Leicester Diabetes Centre, University Hospitals of Leicester NHS Trust, Leicester, UK
| | - J Troughton
- Leicester Diabetes Centre, University Hospitals of Leicester NHS Trust, Leicester, UK
| | - I G Lawrence
- Department of Diabetes and Endocrinology, University Hospitals of Leicester NHS Trust, Leicester, UK
| | - P G McNally
- Department of Diabetes and Endocrinology, University Hospitals of Leicester NHS Trust, Leicester, UK
| | - M J Davies
- Diabetes Research Centre, University of Leicester, Leicester, UK
- Leicester Diabetes Centre, University Hospitals of Leicester NHS Trust, Leicester, UK
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John E, Meghan R, Andrew A, Stephanie W. Differential gene expression and phenotype during motor neuron differentiation of human induced pluripotent stem cells in 3D fibrin scaffolds. Front Bioeng Biotechnol 2016. [DOI: 10.3389/conf.fbioe.2016.01.01033] [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: 11/13/2022] Open
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Meghan R, Andrew A, Stephanie W, John E. Genipin crosslinked fibrin as a potential bioscaffold for delivering spinal motor neurons derived from human induced pluripotent stem cells. Front Bioeng Biotechnol 2016. [DOI: 10.3389/conf.fbioe.2016.01.01685] [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: 11/13/2022] Open
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Simpson S, Cassidy D, Copeland L, John E, Stanton H, Jewell K. Weight management in pregnancy. Participants' experiences of ‘Healthy Eating and Lifestyle in Pregnancy (HELP)’ trial. Appetite 2015. [DOI: 10.1016/j.appet.2014.12.178] [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: 10/24/2022]
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Weis S, John E, Lippmann N, Mössner J, Lübbert C. Erratum: Clostridium-difficile-Infektionen (CDI) im Wandel der Zeit – ein Thema nur für den Internisten? Zentralbl Chir 2014. [DOI: 10.1055/s-0034-1368432] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- S. Weis
- Department für Innere Medizin, Neurologie und Dermatologie, Klinik für Gastroenterologie und Rheumatologie, Universität Leipzig, Leipzig, Deutschland
| | - E. John
- Chirurgie, Martin-Luther-Universität Halle-Wittenberg, Halle/Saale, Deutschland
| | - N. Lippmann
- Institut für Medizinische Mikrobiologie, Universität Leipzig, Leipzig, Deutschland
| | - J. Mössner
- Department für Innere Medizin, Neurologie und Dermatologie, Klinik für Gastroenterologie und Rheumatologie, Universität Leipzig, Leipzig, Deutschland
| | - C. Lübbert
- Department für Innere Medizin, Neurologie und Dermatologie, Klinik für Gastroenterologie und Rheumatologie, Universität Leipzig, Leipzig, Deutschland
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Weis S, John E, Lippmann N, Mössner J, Lübbert C. [Clostridium difficile infection (CDI) in the course of time - an issue only for the internist?]. Zentralbl Chir 2013; 139:460-8. [PMID: 24132675 DOI: 10.1055/s-0032-1328623] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND Toxigenic strains of Clostridium (C.) difficile are the most prevalent pathogens of antibiotic associated intestinal disease and nosocomial diarrhoea. During the last 10 years, incidences of C. difficile infection (CDI) have increased worldwide. MATERIALS AND METHODS With clinical and microbiological original data for 2002-2012 from the University Hospitals Leipzig and Halle (Saale), Germany, the authors illustrate the current situation regarding CDI in the states of Saxony and Saxony-Anhalt and exemplify the latest developments in terms of incidence, prevalence of resistance, diagnosis and treatment strategies regarding CDI with an emphasis on surgical options. RESULTS Following the general trend, at the University Hospitals of Leipzig and Halle (Saale) there was also an increase in incidence of CDI, especially of severe clinical courses. In primary and secondary care facilities, prevention of CDI is based on hygiene management and restricted usage of antibiotics, preferably as "Antibiotic Stewardship" programmes. In 2012, the new macrocyclic antibiotic Fidaxomicin was approved in the European Union for the treatment of CDI. The therapeutic armamentarium, previously based on metronidazole or vancomycin, has now been enriched by a substance that presumably will reduce the rate of recurrence of CDI. Moreover, early data from case series and controlled trials suggest that the re-establishment of eubiosis in the colon of patients with recurrent CDI by stool transplantation from healthy donors is an alternative to antibiotics. Standard surgical intervention for refractory CDI is subtotal colectomy with terminal ileostomy. In patients with adequate life expectancy and without organ dysfunction, a colon-saving surgical technique should be considered. CONCLUSION Taking antibiotics for most remains the main risk factor for suffering from symptomatic CDI. With the introduction of Fidaxomicin there is hope for an improvement in the conservative treatment of CDI. Stool transplants from healthy donors are now considered to be better than giving antibiotics for severe CDI, but this treatment has not found broad acceptance yet. In cases with a lack of early treatment success, the surgeon must be consulted. Here, the evidence for preferably colon-saving surgical procedures is so far unfortunately low.
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Affiliation(s)
- S Weis
- Department für Innere Medizin, Neurologie und Dermatologie, Klinik für Gastroenterologie und Rheumatologie, Universität Leipzig, Leipzig, Deutschland
| | - E John
- Chirurgie, Martin-Luther-Universität Halle-Wittenberg, Halle/Saale, Deutschland
| | - N Lippmann
- Institut für Medizinische Mikrobiologie, Universität Leipzig, Leipzig, Deutschland
| | - J Mössner
- Department für Innere Medizin, Neurologie und Dermatologie, Klinik für Gastroenterologie und Rheumatologie, Universität Leipzig, Leipzig, Deutschland
| | - C Lübbert
- Department für Innere Medizin, Neurologie und Dermatologie, Klinik für Gastroenterologie und Rheumatologie, Universität Leipzig, Leipzig, Deutschland
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Abstract
Necrotizing soft tissue infections are a complex pathological spectrum of symptoms and result in a significantly increased risk of mortality depending on the degree of dissemination as well as the underlying bacterial infection. Hyperbaric oxygen therapy (HBOT) can significantly improve the effectiveness of a multidisciplinary treatment concept consisting of surgical debridement, critical care and antibiotic treatment. HBOT itself assists solid wound healing by bactericidal and bacteriostatic effects and by increasing the oxygen supply up to the cellular level resulting in an optimization of oxygen-dependent metabolic processes. The efficacy of treatment in a centre of cooperating specialized departments can therefore be increased by utilizing HBOT as adjunct treatment. Nevertheless, if a HBOT facility is available, excluding HBOT is equivalent to omission of an effective therapy option to the disadvantage of patients.
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Affiliation(s)
- M Schmale
- Klinik für Anästhesiologie und operative Intensivmedizin, Universitätsklinikum Halle (Saale), Halle (Saale), Deutschland.
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Dralle H, John E. [Necrotizing soft tissue infections: the timing of therapy is decisive!]. Chirurg 2012; 83:941-2. [PMID: 23089946 DOI: 10.1007/s00104-012-2280-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- H Dralle
- Universitätsklinik und -poliklinik für Allgemein-, Viszeral- und Gefäßchirurgie, Universitätsklinikum Halle (Saale), Martin-Luther-Universität Halle, Halle (Saale), Deutschland.
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Heathfield S, Parker B, Zeef L, Bruce I, Alexander Y, Collins F, Stone M, Wang E, Williams AS, Wright HL, Thomas HB, Moots RJ, Edwards SW, Bullock C, Chapman V, Walsh DA, Mobasheri A, Kendall D, Kelly S, Bayley R, Buckley CD, Young SP, Rump-Goodrich L, Middleton J, Chen L, Fisher R, Kollnberger S, Shastri N, Kessler BM, Bowness P, Nazeer Moideen A, Evans L, Osgood L, Williams AS, Jones SA, Nowell MA, Mahadik Y, Young S, Morgan M, Gordon C, Harper L, Giles JL, Paul Morgan B, Harris CL, Rysnik OJ, McHugh K, Kollnberger S, Payeli S, Marroquin O, Shaw J, Renner C, Bowness P, Nayar S, Cloake T, Bombardieri M, Pitzalis C, Buckley C, Barone F, Barone F, Nayar S, Cloake T, Lane P, Coles M, Buckley C, Williams EL, Edwards CJ, Cooper C, Oreffo RO, Dunn S, Crawford A, Wilkinson M, Le Maitre C, Bunning R, Daniels J, Phillips KLE, Chiverton N, Le Maitre CL, Kollnberger S, Shaw J, Ridley A, Wong-Baeza I, McHugh K, Keidel S, Chan A, Bowness P, Gullick NJ, Abozaid HS, Jayaraj DM, Evans HG, Scott DL, Choy EH, Taams LS, Hickling M, Golor G, Jullion A, Shaw S, Kretsos K, Bari SF, Rhys-Dillon B, Amos N, Siebert S, Phillips KLE, Chiverton N, Bunning RD, Haddock G, Cross AK, Le Maitre CL, Kate I, Phillips E, Cross A, Chiverton N, Haddock G, Bunning RAD, Le Maitre CL, Ceeraz S, Spencer J, Choy E, Corrigall V, Crilly A, Palmer H, Lockhart J, Plevin R, Ferrell WR, McInnes I, Hutchinson D, Perry L, DiCicco M, Humby F, Kelly S, Hands R, Buckley C, McInnes I, Taylor P, Bombardieri M, Pitzalis C, Mehta P, Mitchell A, Tysoe C, Caswell R, Owens M, Vincent T, Hashmi TM, Price-Forbes A, Sharp CA, Murphy H, Wood EF, Doherty T, Sheldon J, Sofat N, Goff I, Platt PN, Abdulkader R, Clunie G, Ismajli M, Nikiphorou E, Young A, Tugnet N, Dixey J, Banik S, Alcorn D, Hunter J, Win Maw W, Patil P, Hayes F, Main Wong W, Borg FA, Dasgupta B, Malaviya AP, Ostor AJ, Chana JK, Ahmed AA, Edmonds S, Hayes F, Coward L, Borg F, Heaney J, Amft N, Simpson J, Dhillon V, Ayalew Y, Khattak F, Gayed M, Amarasena RI, McKenna F, Amarasena RI, McKenna F, Mc Laughlin M, Baburaj K, Fattah Z, Ng N, Wilson J, Colaco B, Williams MR, Adizie T, Dasgupta B, Casey M, Lip S, Tan S, Anderson D, Robertson C, Devanny I, Field M, Walker D, Robinson S, Ryan S, Hassell A, Bateman J, Allen M, Davies D, Crouch C, Walker-Bone K, Gainsborough N, Gullick NJ, Lutalo PM, Davies UM, Walker-Bone K, Mckew JR, Millar AM, Wright SA, Bell AL, Thapper M, Roussou T, Cumming J, Hull RG, Thapper M, Roussou T, McKeogh J, O'Connor MB, Hassan AI, Bond U, Swan J, Phelan MJ, Coady D, Kumar N, Farrow L, Bukhari M, Oldroyd AG, Greenbank C, McBeth J, Duncan R, Brown D, Horan M, Pendleton N, Littlewood A, Cordingley L, Mulvey M, Curtis EM, Cole ZA, Crozier SR, Georgia N, Robinson SM, Godfrey KM, Sayer AA, Inskip HM, Cooper C, Harvey NC, Davies R, Mercer L, Galloway J, Low A, Watson K, Lunt M, Symmons D, Hyrich K, Chitale S, Estrach C, Moots RJ, Goodson NJ, Rankin E, Jiang CQ, Cheng KK, Lam TH, Adab P, Ling S, Chitale S, Moots RJ, Estrach C, Goodson NJ, Humphreys J, Ellis C, Bunn D, Verstappen SM, Symmons D, Fluess E, Macfarlane GJ, Bond C, Jones GT, Scott IC, Steer S, Lewis CM, Cope A, Mulvey MR, Macfarlane GJ, Symmons D, Lovell K, Keeley P, Woby S, Beasley M, McBeth J, Viatte S, Plant D, Lunt M, Fu B, Parker B, Galloway J, Solymossy C, Worthington J, Symmons D, Dixey J, Young A, Barton A, Williams FM, Osei-Bordom DC, Popham M, MacGregor A, Spector T, Little J, Herrick A, Pushpakom S, Ennis H, McBurney H, Worthington J, Newman W, Ibrahim I, Plant D, Hyrich K, Morgan A, Wilson A, Isaacs J, Barton A, Sanderson T, Hewlett S, Calnan M, Morris M, Raza K, Kumar K, Cardy CM, Pauling JD, Jenkins J, Brown SJ, McHugh N, Nikiphorou E, Mugford M, Davies C, Cooper N, Brooksby A, Bunn D, Symmons D, MacGregor A, Dures E, Ambler N, Fletcher D, Pope D, Robinson F, Rooke R, Hewlett S, Gorman CL, Reynolds P, Hakim AJ, Bosworth A, Weaver D, Kiely PD, Skeoch S, Jani M, Amarasena R, Rao C, Macphie E, McLoughlin Y, Shah P, Else S, Semenova O, Thompson H, Ogunbambi O, Kallankara S, Patel Y, Baguley E, Jani M, Halsey J, Severn A, Bukhari M, Selvan S, Price E, Husain MJ, Brophy S, Phillips CJ, Cooksey R, Irvine E, Siebert S, Lendrem D, Mitchell S, Bowman S, Price E, Pease CT, Emery P, Andrews J, Bombardieri M, Sutcliffe N, Pitzalis C, Lanyon P, Hunter J, Gupta M, McLaren J, Regan M, Cooper A, Giles I, Isenberg D, Griffiths B, Foggo H, Edgar S, Vadivelu S, Coady D, McHugh N, Ng WF, Dasgupta B, Taylor P, Iqbal I, Heron L, Pilling C, Marks J, Hull R, Ledingham J, Han C, Gathany T, Tandon N, Hsia E, Taylor P, Strand V, Sensky T, Harta N, Fleming S, Kay L, Rutherford M, Nicholl K, Kay L, Rutherford M, Nicholl K, Eyre T, Wilson G, Johnson P, Russell M, Timoshanko J, Duncan G, Spandley A, Roskell S, Coady D, West L, Adshead R, Donnelly SP, Ashton S, Tahir H, Patel D, Darroch J, Goodson NJ, Boulton J, Ellis B, Finlay R, Lendrem D, Mitchell S, Bowman S, Price E, Pease CT, Emery P, Andrews J, Bombardieri M, Sutcliffe N, Pitzalis C, Lanyon P, Hunter J, Gupta M, McLaren J, Regan M, Cooper A, Giles I, Isenberg D, Vadivelu S, Coady D, McHugh N, Griffiths B, Foggo H, Edgar S, Ng WF, Murray-Brown W, Priori R, Tappuni T, Vartoukian S, Seoudi N, Picarelli G, Fortune F, Valesini G, Pitzalis C, Bombardieri M, Ball E, Rooney M, Bell A, Merida AA, Isenberg D, Tarelli E, Axford J, Giles I, Pericleous C, Pierangeli SS, Ioannou J, Rahman A, Alavi A, Hughes M, Evans B, Bukhari M, Parker B, Zaki A, Alexander Y, Bruce I, Hui M, Garner R, Rees F, Bavakunji R, Daniel P, Varughese S, Srikanth A, Andres M, Pearce F, Leung J, Lim K, Regan M, Lanyon P, Oomatia A, Petri M, Fang H, Birnbaum J, Amissah-Arthur M, Gayed M, Stewart K, Jennens H, Braude S, Gordon C, Sutton EJ, Watson KD, Gordon C, Yee CS, Lanyon P, Jayne D, Isenberg D, Rahman A, Akil M, McHugh N, Ahmad Y, Amft N, D'Cruz D, Edwards CJ, Griffiths B, Khamashta M, Teh LS, Zoma A, Bruce I, Dey ID, Kenu E, Isenberg D, Pericleous C, Garza-Garcia A, Murfitt L, Driscoll PC, Isenberg D, Pierangeli S, Giles I, Ioannou Y, Rahman A, Reynolds JA, Ray DW, O'Neill T, Alexander Y, Bruce I, Segeda I, Shevchuk S, Kuvikova I, Brown N, Bruce I, Venning M, Mehta P, Dhanjal M, Mason J, Nelson-Piercy C, Basu N, Paudyal P, Stockton M, Lawton S, Dent C, Kindness K, Meldrum G, John E, Arthur C, West L, Macfarlane MV, Reid DM, Jones GT, Macfarlane GJ, Yates M, Loke Y, Watts R, MacGregor A, Adizie T, Christidis D, Dasgupta B, Williams M, Sivakumar R, Misra R, Danda D, Mahendranath KM, Bacon PA, Mackie SL, Pease CT. Basic science * 232. Certolizumab pegol prevents pro-inflammatory alterations in endothelial cell function. Rheumatology (Oxford) 2012. [DOI: 10.1093/rheumatology/kes108] [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: 11/13/2022] Open
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Juhnke M, Märtin D, John E. Generation of wear during the production of drug nanosuspensions by wet media milling. Eur J Pharm Biopharm 2012; 81:214-22. [DOI: 10.1016/j.ejpb.2012.01.005] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Revised: 01/05/2012] [Accepted: 01/09/2012] [Indexed: 11/29/2022]
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John E, Christiansen FT, Mueller I, Schofield L, Senitzer D, Siba P, Witt CS. Distinct distribution of killer-cell immunoglobulin-like receptor genes in the Mugil and Ilaita areas of Papua New Guinea. Tissue Antigens 2012; 79:263-71. [PMID: 22320834 DOI: 10.1111/j.1399-0039.2012.01848.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The frequency of the killer-cell immunoglobulin-like receptor (KIR) genes and transmembrane alleles of KIR2DL4 were studied in coastal (Mugil community) and inland (Ilaita community) communities in Papua New Guinea. Linkage disequilibria between KIR genes and between alleles of KIR2DL4 and the KIR genes were similar to those found in other populations suggesting conservation of the usual gene order in Papua New Guinean haplotypes. Significant differences in the frequency of KIR genes were found between the two populations despite being separated by only 300 km. Examples of individuals who lacked the KIR2DL4 gene and others whose KIR2DL4 allele appeared to have 11 adenines in the polyadenine tract in exon 6 were identified. A relatively low frequency of the KIR A haplotype was found in both populations and particularly in the inland community. The KIR gene frequencies were consistent with the inland Ilaita community being closely related to Australian Aborigines and southern Indians, whereas the KIR gene frequencies of the coastal Mugil community appeared to have been influenced either by recent or ancient admixture from populations with a higher frequency of the KIR A haplotype.
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Affiliation(s)
- E John
- Department of Clinical Immunology, PathWest, Royal Perth Hospital, Perth, WA, Australia
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McCree-Hale R, Kajula-Maonga L, Sheya wa Mnyakaya TR, Joachim J, Mrumbi K, John E, Kaaya S. P2-S1.12 Project prepare Tanzania: engaging multiple stakeholders to develop a school-based sexual health curriculum for adolescents. Br J Vener Dis 2011. [DOI: 10.1136/sextrans-2011-050108.290] [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: 11/04/2022]
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Setty S, Wu SJ, Bogard A, Chejfec G, Carroll R, Benedetti E, John E, Setty A. Application of the paraboloidal model to assess mucosal changes following segmental intestinal transplantation in children. Transplant Proc 2011; 43:1823-30. [PMID: 21693285 DOI: 10.1016/j.transproceed.2011.03.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2010] [Accepted: 03/01/2011] [Indexed: 10/18/2022]
Abstract
Segmental living related small intestinal transplantation (LRSITx) is a therapeutic option for conditions that present with short gut syndromes. Recovery of small intestinal mucosa after transplantation is critical to function. We examined the posttransplant mucosal changes to understand the absorptive capabilities of transplanted small intestine. The study of human subjects is constrained by limited biopsy material; therefore, we developed a technique of villus area measurement by extrapolation from two-dimensional surgical biopsy images. Using a detailed model of the villus as the gold standard, two simpler models (cylindrical and paraboloid) were tested. Comparisons with the accurate measurement revealed that the cylinder model does not compare well in early posttransplant biopsies. The paraboloid function developed in this article worked very well under all conditions. The simplicity of the paraboloid model and its robustness made high-quality estimates of the absorptive surface area from abundant data relatively easy. The remodeling expected in the initial stages of growth was also captured by this model. Time-dependent villus growth curves were obtained for transplanted bowel. Serial biopsies showed an initial "reconstruction" dip around 2 weeks after transplant, followed by continuous growth of villus surface area. An eventual plateau resulted at an average of 6 months after transplant. This growth of villi was shown to parallel the improved absorption of electrolytes, amino acids, and water.
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Affiliation(s)
- S Setty
- Department of Pathology, University of Illinois Medical Center at Chicago, Illinois, USA
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Akulian J, Pipeling M, John E, McDyer J. 404 Differential Phenotype and Distribution of CMV-Specific T Cell Effector Memory between the Lung Allograft and Blood in High-Risk Lung Transplant Recipients. J Heart Lung Transplant 2011. [DOI: 10.1016/j.healun.2011.01.413] [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: 11/17/2022] Open
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Abstract
We have performed time-resolved fluorescence energy transfer measurements using melittin as donor and a modified melittin as acceptor. The melittin molecules were bound to fluid vesicle membranes of dimyristoylphosphatidylcholine. Analysis of the temporal decay of the energy transfer and of its variation with the donor and acceptor concentrations led to the conclusion that melittin in fluid membranes is usually monomeric. Only at the high melittin/lipid molar ratio of 1/200 and high ionic strength evidence for aggregation was obtained, the percentage of aggregated melittin molecules being of the order of 10%. The shortcomings of previous steady-state measurements of fluorescence energy transfer between melittin molecules are discussed.
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Affiliation(s)
- E John
- Max-Planck-Institut für Biologie, Abteilung Membranbiochemie, Corrensstrasse 38, D 7400 Tübingen, Germany
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Lotze M, Tang D, Buchser W, Liang X, DeVera M, Plevy S, John E, Pitt B, Basse P, Butterfield L, Kalinski P, Zeh H, Lotfi R, Rubartelli A. E14 Damage associated molecular pattern molecules (DAMPs) redox and autophagy. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/s1873-9954(10)70018-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Meier M, John E, Wieckhusen D, Wirth W, Peukert W. Generally applicable breakage functions derived from single particle comminution data. POWDER TECHNOL 2009. [DOI: 10.1016/j.powtec.2009.03.018] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [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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Goodridge J, Lathbury L, John E, Charles A, Christiansen F, Witt C. The genotype of the NK cell receptor, KIR2DL4, influences INF secretion by decidual natural killer cells. Mol Hum Reprod 2009; 15:489-97. [DOI: 10.1093/molehr/gap039] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Sajewicz M, John E, Kronenbach D, Gontarska M, Wróbel M, Kowalska T. How to suppress the spontaneous oscillatory in-vitro chiral conversion of α-substituted propionic acids? A thin-layer chromatographic, polarimetric, and circular dichroism study of complexation of the Cu(II) cation withl-lactic acid. ACTA CHROMATOGR 2009. [DOI: 10.1556/achrom.21.2009.1.4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Schrader K, Masciari S, Boyd N, Senz J, Kaurah P, Terry MB, John E, Andrulis IL, Knight J, O'Malley FP, Daly M, Bender P, Southey MC, Hopper JL, Garber J, Huntsman DG. THE ASSOCIATION OF LOBULAR BREAST CANCER WITH GERMLINE MUTATIONS OF CDH1. CLIN INVEST MED 2008. [DOI: 10.25011/cim.v31i4.4826] [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
Background: CDH1 encodes the cell-cell adhesion molecule, E-cadherin, for which loss of expression facilitates the infiltrative and metastatic potential of cancers. Germline mutations in CDH1 are associated with hereditary diffuse gastric cancer (HDGC), and in this setting female carriers have been estimated to have a 39-50% risk of lobular breast cancer (LBC) by age 80 years.
Aim: To determine the frequency of CDH1 germline mutations inindividuals with early-onset LBC or those with LBC and a family history of multiple breast cancers but no gastric cancers.
Methods: Germline DNA analysis of CDH1 in women with LBC, for whom germline BRCA1 and BRCA2 mutations have been excluded, who have been (1) diagnosed before the age of 45 years or (2) diagnosed at any age and have a family history of breast cancer.
Results: Analysis of 194 LBC cases has thus far revealed two novel missense mutations predicted to affect protein function. Functional assays to assess their pathogenicity along with germline analyses of the remaining 200 cases are currently underway. Several unreported silent changes have also been identified and will be measured in a case- control sample to assess whether they are associated with LBC risk.
Conclusion: Germline CDH1 mutations may cause a small proportion of familial and early onset LBC.
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Meier M, John E, Wieckhusen D, Wirth W, Peukert W. Characterization of the grinding behaviour in a single particle impact device: Studies on pharmaceutical powders. Eur J Pharm Sci 2008; 34:45-55. [DOI: 10.1016/j.ejps.2008.02.120] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2007] [Revised: 01/08/2008] [Accepted: 02/14/2008] [Indexed: 10/22/2022]
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Abstract
Moyamoya disease is a cerebral vasculopathy of unknown etiology frequently seen in the Asian population. We report a case of moyamoya vasculopathy in an African-American child who had renal failure followed by cerebral ischemia. Our patient presented with hemolytic uremic syndrome (HUS) and renal failure, and later developed seizures. We believe that in this patient HUS led to the pathogenesis of moyamoya disease. We suggest that patients with HUS who develop any neurological symptoms should be investigated for moyamoya vasculopathy for early diagnosis and treatment.
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Affiliation(s)
- M Singla
- Department of Pediatrics, University of Illinois at Chicago, College of Medicine, Chicago, IL 60612, USA.
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Guchardi R, Frei M, John E, Kaerger JS. Influence of fine lactose and magnesium stearate on low dose dry powder inhaler formulations. Int J Pharm 2008; 348:10-7. [PMID: 17689898 DOI: 10.1016/j.ijpharm.2007.06.041] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2007] [Revised: 06/25/2007] [Accepted: 06/27/2007] [Indexed: 11/18/2022]
Abstract
The behaviour of dry powder blends for inhalation, depending on the amount of fine lactose particles smaller than 10microm and the presence of magnesium stearate (MgSt), was studied in this work. A laser light diffraction method was developed to determine accurately size and volume fraction of these fine lactose particles in coarse carrier lactose (x(50) approximately 220microm). A linear relationship between measured volume fraction undersize at 10microm Q(3)(10microm) and added fine lactose could be established. Aerodynamic particle size distribution analysis of lactose showed that the fine lactose was attached to the coarse particles. In the presence of MgSt this interaction was increased. Consequently, the number of free active sites on the carrier surface was reduced and the investigated drug (formoterol fumarate dihydrate) was more effectively delivered. Addition of fine lactose and MgSt improved the aerodynamic performance the drug, as determined by resulting fine particle fraction, by 3% (for each 1% of added fine lactose) and 10%, respectively. Stability tests indicated that added MgSt was the most relevant of the studied parameter to achieve a stable aerodynamic performance. Its ability to protect the moisture uptake into the system was considered as rational for this effect.
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Affiliation(s)
- R Guchardi
- Novartis Pharma AG, Inhalation Development and Technology, CH-4002 Basel, Switzerland
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Auer-Grumbach M, Fischer C, Papić L, John E, Plecko B, Bittner RE, Bernert G, Pieber TR, Miltenberger G, Schwarz R, Windpassinger C, Grill F, Timmerman V, Speicher MR, Janecke AR. Two novel mutations in the GDAP1 and PRX genes in early onset Charcot-Marie-Tooth syndrome. Neuropediatrics 2008; 39:33-8. [PMID: 18504680 PMCID: PMC3272394 DOI: 10.1055/s-2008-1077085] [Citation(s) in RCA: 16] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Autosomal recessive Charcot-Marie-Tooth syndrome (AR-CMT) is often characterised by an infantile disease onset and a severe phenotype. Mutations in the ganglioside-induced differentiation-associated protein 1 (GDAP1) gene are thought to be a common cause of AR-CMT. Mutations in the periaxin (PRX) gene are rare. They are associated with severe demyelination of the peripheral nerves and sometimes lead to prominent sensory disturbances. To evaluate the frequency of GDAP1 and PRX mutations in early onset CMT, we examined seven AR-CMT families and 12 sporadic CMT patients, all presenting with progressive distal muscle weakness and wasting. In one family also prominent sensory abnormalities and sensory ataxia were apparent from early childhood. In three families we detected four GDAP1 mutations (L58LfsX4, R191X, L239F and P153L), one of which is novel and is predicted to cause a loss of protein function. In one additional family with prominent sensory abnormalities a novel homozygous PRX mutation was found (A700PfsX17). No mutations were identified in 12 sporadic cases. This study suggests that mutations in the GDAP1 gene are a common cause of early-onset AR-CMT. In patients with early-onset demyelinating AR-CMT and severe sensory loss PRX is one of the genes to be tested.
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Affiliation(s)
- M. Auer-Grumbach
- Institute of Human Genetics, Medical University of Graz, Austria
,Department of Internal Medicine, Medical University of Graz, Austria
,Centre for Medical Research, Medical University of Graz, Graz, Austria
| | - C. Fischer
- Institute of Human Genetics, Medical University of Graz, Austria
,Centre for Medical Research, Medical University of Graz, Graz, Austria
| | - L. Papić
- Institute of Human Genetics, Medical University of Graz, Austria
,Centre for Medical Research, Medical University of Graz, Graz, Austria
| | - E. John
- Institute of Human Genetics, Medical University of Graz, Austria
,Centre for Medical Research, Medical University of Graz, Graz, Austria
| | - B. Plecko
- Department of Paediatrics, Medical University of Graz, Austria
| | - R. E. Bittner
- Neuromuscular Research Department, Centre of Anatomy and Cell Biology, Medical University, Vienna, Austria
| | - G. Bernert
- Department of Paediatrics, University of Vienna, Vienna, Austria
| | - T. R. Pieber
- Department of Internal Medicine, Medical University of Graz, Austria
| | - G. Miltenberger
- Division of Clinical Genetics, Medical University, Innsbruck, Austria
| | - R. Schwarz
- Landes Frauen- und Kinderklinik, Linz, Austria
| | - C. Windpassinger
- Institute of Human Genetics, Medical University of Graz, Austria
| | - F. Grill
- Orthopaedic Hospital of Vienna, Speising, Austria
| | - V. Timmerman
- VIB – Department of Molecular Genetics, Peripheral Neuropathy Group, University of Antwerp, Antwerp, Belgium
| | - M. R. Speicher
- Institute of Human Genetics, Medical University of Graz, Austria
| | - A. R. Janecke
- Division of Clinical Genetics, Medical University, Innsbruck, Austria
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Stanimirova I, Połowniak M, Skorek R, Kita A, John E, Buhl F, Walczak B. Chemometric analysis of the water purification process data. Talanta 2007; 74:153-62. [DOI: 10.1016/j.talanta.2007.05.044] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2007] [Revised: 05/20/2007] [Accepted: 05/24/2007] [Indexed: 11/26/2022]
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Auer-Grumbach M, John E, Wallefeld W, Fischer C, Speicher M, Laing N. G.P.17.01 A novel slow-skeletal myosin (MYH7) mutation in a large Austrian family presenting as late onset distal myopathy. Neuromuscul Disord 2007. [DOI: 10.1016/j.nmd.2007.06.407] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Lumpaopong A, Mathew AV, John E, Jelnin V, Benedetti E, Testa G, Oberholzer J, Sankary H, Ruiz C. Early coronary calcification in children and young adults with end-stage renal disease. Transplant Proc 2007; 39:37-9. [PMID: 17275470 DOI: 10.1016/j.transproceed.2006.10.198] [Citation(s) in RCA: 12] [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] [Received: 05/11/2006] [Indexed: 11/29/2022]
Abstract
Cardiovascular disease is a major cause of morbidity and mortality in children and young adults with end-stage renal disease. In our study, we retrospectively analyzed the records of 11 patients who had undergone electron beam computerized tomography in our dialysis unit. Our patients, aged 11 to 24 years (median, 19.3 years) were on dialysis or had functioning grafts. Coronary calcification was observed in seven patients (64%) with a mean calcium score of 273.8 +/- 708 (range 0.8 to 1864) in our study population. We compared clinical characteristics like age, gender, duration of end-stage renal disease, time on hemodialysis, body mass index, and blood pressures between the patients with calcifications (group I) and those with out calcification (group II). We also compared the laboratory data including daily calcium and calcitriol intake, lipid profile, serum calcium and phosphorus levels, calcium/phosphorus products, and serum parathyroid hormone levels in the both groups. The mean daily dose of total calcium, triglyceride level, and calcium/phosphorus products were higher in the calcification group though not statistically significant. The mean daily dose of calcitriol was significantly higher in patients with calcification. Using Spearman multivariate correlation, we found a correlation between the coronary calcium scores and mean daily doses of total calcium and calcitriol (r = .750, P =.008 and r = .869, P = .001, respectively). We conclude that coronary calcification, which is a proven predictor of cardiovascular disease, begins at a very early age and that daily doses of elemental calcium and calcitriol seem to be important factors in our study population.
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Affiliation(s)
- A Lumpaopong
- University of Illinois of Chicago, Chicago, IL 60612, USA
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Hartmuller V, McEligot A, Balbuena R, West D, Giles G, Boyd N, Senie R, John E, Daly M, Seminara D. 054: The Breast Cancer Family Registry: Diet Collection Methodology for Studies of the Genetic Epidemiology of Breast Cancer. Am J Epidemiol 2005. [DOI: 10.1093/aje/161.supplement_1.s14a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - A McEligot
- National Cancer Institute, Bethesda, MD 20892
| | - R Balbuena
- National Cancer Institute, Bethesda, MD 20892
| | - D West
- National Cancer Institute, Bethesda, MD 20892
| | - G Giles
- National Cancer Institute, Bethesda, MD 20892
| | - N Boyd
- National Cancer Institute, Bethesda, MD 20892
| | - R Senie
- National Cancer Institute, Bethesda, MD 20892
| | - E John
- National Cancer Institute, Bethesda, MD 20892
| | - M Daly
- National Cancer Institute, Bethesda, MD 20892
| | - D Seminara
- National Cancer Institute, Bethesda, MD 20892
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Whittemore AS, Balise RR, Pharoah PDP, Dicioccio RA, Oakley-Girvan I, Ramus SJ, Daly M, Usinowicz MB, Garlinghouse-Jones K, Ponder BAJ, Buys S, Senie R, Andrulis I, John E, Hopper JL, Piver MS. Oral contraceptive use and ovarian cancer risk among carriers of BRCA1 or BRCA2 mutations. Br J Cancer 2005; 91:1911-5. [PMID: 15545966 PMCID: PMC2410144 DOI: 10.1038/sj.bjc.6602239] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.9] [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] [Indexed: 11/14/2022] Open
Abstract
Women with mutations of the genes BRCA1 or BRCA2 are at increased risk of ovarian cancer. Oral contraceptives protect against ovarian cancer in general, but it is not known whether they protect against the disease in carriers of these mutations. We obtained self-reported lifetime histories of oral contraceptive use from 451 women who carried mutations of BRCA1 or BRCA2. We used conditional logistic regression to estimate the odds ratios associated with oral contraceptive use, comparing the histories of 147 women with ovarian cancer (cases) to those of 304 women without ovarian cancer (controls) who were matched to cases on year of birth, country of residence and gene (BRCA1 vs BRCA2). Reference ages for controls had to exceed the ages at diagnosis of their matched cases. After adjusting for parity, the odds-ratio for ovarian cancer associated with use of oral contraceptives for at least 1 year was 0.85 (95 percent confidence interval, 0.53–1.36). The risk decreased by 5% (1–9%) with each year of use (P for trend=0.01). Use for 6 or more years was associated with an odds-ratio of 0.62 (0.35–1.09). These data support the hypothesis that long-term oral contraceptive use reduces the risk of ovarian cancer among women who carry mutations of BRCA1 or BRCA2.
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Affiliation(s)
- A S Whittemore
- Department of Health Research and Policy, Stanford University School of Medicine, HRP Redwood Building, Stanford, CA 94305-5405, USA.
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Benesch T, Meier U, John E, Blatter F, Schütz W. Influences of physicochemical parameters on the separation of colloidal organics. FILTR SEPARAT 2004. [DOI: 10.1016/s0015-1882(05)00413-1] [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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Benesch T, Meier U, John E, Blatter F, Schütz W. Influence of physicochemical parameters on the separation of colloidal organics. FILTR SEPARAT 2004. [DOI: 10.1016/s0015-1882(05)00412-x] [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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Pegram M, Yeon CH, Ku N, Gottlieb C, Shepard M, Cossum P, John E, Iqbal S, Garcia A, Lenz HJ. Enzyme catalyzed therapeutic activation of NB1011 (N) selectively targets thymidylate synthase (TS)-overexpressing tumor cells: Phase I results. J Clin Oncol 2004. [DOI: 10.1200/jco.2004.22.90140.3144] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- M. Pegram
- UCLA Geffen School of Medicine, Los Angeles, CA; UCLA Oncology Research Network, Los Angeles, CA; NewBiotics, San Diego, CA; USC Keck School of Medicine, Los Angeles, CA
| | - C. H. Yeon
- UCLA Geffen School of Medicine, Los Angeles, CA; UCLA Oncology Research Network, Los Angeles, CA; NewBiotics, San Diego, CA; USC Keck School of Medicine, Los Angeles, CA
| | - N. Ku
- UCLA Geffen School of Medicine, Los Angeles, CA; UCLA Oncology Research Network, Los Angeles, CA; NewBiotics, San Diego, CA; USC Keck School of Medicine, Los Angeles, CA
| | - C. Gottlieb
- UCLA Geffen School of Medicine, Los Angeles, CA; UCLA Oncology Research Network, Los Angeles, CA; NewBiotics, San Diego, CA; USC Keck School of Medicine, Los Angeles, CA
| | - M. Shepard
- UCLA Geffen School of Medicine, Los Angeles, CA; UCLA Oncology Research Network, Los Angeles, CA; NewBiotics, San Diego, CA; USC Keck School of Medicine, Los Angeles, CA
| | - P. Cossum
- UCLA Geffen School of Medicine, Los Angeles, CA; UCLA Oncology Research Network, Los Angeles, CA; NewBiotics, San Diego, CA; USC Keck School of Medicine, Los Angeles, CA
| | - E. John
- UCLA Geffen School of Medicine, Los Angeles, CA; UCLA Oncology Research Network, Los Angeles, CA; NewBiotics, San Diego, CA; USC Keck School of Medicine, Los Angeles, CA
| | - S. Iqbal
- UCLA Geffen School of Medicine, Los Angeles, CA; UCLA Oncology Research Network, Los Angeles, CA; NewBiotics, San Diego, CA; USC Keck School of Medicine, Los Angeles, CA
| | - A. Garcia
- UCLA Geffen School of Medicine, Los Angeles, CA; UCLA Oncology Research Network, Los Angeles, CA; NewBiotics, San Diego, CA; USC Keck School of Medicine, Los Angeles, CA
| | - H.-J. Lenz
- UCLA Geffen School of Medicine, Los Angeles, CA; UCLA Oncology Research Network, Los Angeles, CA; NewBiotics, San Diego, CA; USC Keck School of Medicine, Los Angeles, CA
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Holterman MJ, Holterman AL, Carrol R, John E, Testa G, Sankary H, Cohen M, Grevious M, Abcarian HA, Benedetti E. Living-related bowel transplantation to treat short bowel syndrome in a four-year-old child: a case report. J Pediatr Surg 2003; 38:1763-5. [PMID: 14666462 DOI: 10.1016/j.jpedsurg.2003.08.049] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
PURPOSE Short bowel syndrome (SBS) is an extremely challenging clinical problem in children. Although many patients can be maintained for a period of time on total parenteral nutrition (TPN), many of these children suffer from the morbidity and mortality associated with sequential central line infections, venous thromboses, and TPN-induced liver failure. Intestinal transplantation often is the only chance for long-term survival. Unfortunately, many children die every year waiting for size-matched cadaveric intestine to become available. METHODS After our success with living-related bowel transplantation in adults, the authors successfully transplanted 150 cm of maternal ileum into a 4-year-old 10-kg child with profound malnutrition from SBS and advanced TPN-induced liver failure. Because of the size mismatch, the abdominal cavity could not be closed primarily. The defect was covered with absorbable mesh and subsequently with skin graft. RESULTS The patient is home with excellent bowel and liver function, off hyperalimentation, and on a regular diet. No rejection has been encountered. CONCLUSIONS Living-related intestinal transplantation is a life-saving alternative to cadaveric intestinal transplantation in children with short bowel syndrome.
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Affiliation(s)
- M J Holterman
- Department of Surgery, University of Illinois at Chicago, Chicago, IL, USA
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Chin A, Radhakrishnan J, Fornell L, John E. Effects of tezosentan, a dual endothelin receptor antagonist, on the cardiovascular and renal systems of neonatal piglets. J Pediatr Surg 2001; 36:1824-8. [PMID: 11733915 DOI: 10.1053/jpsu.2001.28852] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND/PURPOSE Endothelin is a potent biological vasoactive mediator in the cardiovascular and renal systems. Little is known of the effects of endothelin antagonism on the developing heart and kidney, and we hope to show that endothelin does have an important role in the cardiovascular and renal systems of the developing neonate. In this study the authors have examined the effects of tezosentan, a nonselective endothelin-A and endothelin-B receptor antagonist designed for parenteral use, on the cardiovascular and renal systems of healthy neonatal piglets. METHODS Eight, 7- to 10-day old domestic piglets weighing 2.5 to 3.0 kg were anesthetized, intubated, and ventilated with catheters placed into the jugular vein, left ventricle, and femoral artery. Urine output was monitored via a suprapubic cystostomy. After baseline data were obtained the piglets received tezosentan (1 mg/kg/h) for 1 hour. A set of data was collected just before discontinuation of the 1-hour infusion of tezosentan and another set was collected 1 hour after the discontinuation of the drug. Mean arterial pressure (MAP), heart rate (HR), and urine output (UV) were monitored continuously and cardiac index (CI), systemic vascular resistance (SVR), renal blood flow (RBF), and renal vascular resistance (RVR) were calculated from gamma counts obtained from injections of radio-labeled microspheres at end of the different time periods. Glomerular filtration rate (GFR) was obtained by the sodium iothalamate method. Data were averaged and plotted versus time and analyzed statistically by a Student's t test. RESULTS (P <.05 versus baseline*). In our experimental animals the infusion of tezosentan diminished MAP and SVR from baseline values of 94 +/- 7 mm Hg and 0.14 +/- 0.03 mm Hg/mL/min, respectively to TEZO values of 62 +/- 4* mm Hg and 0.07 +/- 0.02* mm Hg/mL/min. CI increased from 278 +/- 58 to 367 +/- 75* mL/min/kg with tezosentan. There also was a statistically significant increase in RBF from 1.16 +/- 0.38 to 1.86 +/- 0.37* mL/min/kg, an increase in UV from 0.57 +/- 0.24 to 0.64 +/- 0.12* mL/min, a decrease in RVR from 4.60 +/- 1.47 to 2.03 +/- 0.36* mm Hg/mL/min, and no change in the GFR. CONCLUSIONS The inhibition of endothelin receptors with tezosentan produced a statistically significant effect on the piglet cardiovascular system with a drop in MAP and SVR and an increase in CI and HR. It also produced a statistically significant increase in RBF and UV and a decrease in RVR without affecting GFR. J Pediatr Surg 36:1824-1828.
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Affiliation(s)
- A Chin
- Divisions of Pediatric Surgery and Pediatric Nephrology, The University of Illinois College of Medicine at Chicago, Chicago, IL, USA
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Lechin F, van der Dijs B, Pardey-Maldonado B, John E, Jimenez V, Orozco B, Baez S, Lechin ME. Enhancement of noradrenergic neural transmission: an effective therapy of myasthenia gravis: a report on 52 consecutive patients. J Med 2001; 31:333-61. [PMID: 11508327] [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] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
Neurochemical, neuroautonomic and neuropharmacological assessments carried out on all our myasthenia gravis (MG) patients showed that they presented a neural sympathetic deficit plus excessive adrenal-sympathetic activity. These abnormalities were registered during the basal (supine-resting) state, as well as after several stress tests (orthostasis, exercise, oral glucose and buspirone). In addition, MG patients showed increased levels of free-serotonin (f5HT) in the plasma, supposedly associated with the increased platelet aggregability which we found in all MG patients. As the above trio of neurochemical disorders (low noradrenergic-activity + high adrenergic-activity + increased f-5HT plasma levels) is known to favor Th-1 immunosuppression + Th-2 predominance, we outlined a neuropharmacological strategy for reverting the above neurochemical disorder. This treatment provoked sudden (acute), and late sustained improvements. Acute effects have been attributed to the increase of alpha-1 activity at the spinal motoneuron level. Late improvements always paralleled a significant normalization of immunological disorders. Complete normalization was registered only in non-thymectomized MG patients.
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Affiliation(s)
- F Lechin
- Section of Neuropharmacology, Instituto de Medicina Experimental, Universidad Central de Venezuela.
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Todd DA, Boyd J, Lloyd J, John E. Inspired gas humidity during mechanical ventilation: effects of humidification chamber, airway temperature probe position and environmental conditions. J Paediatr Child Health 2001; 37:489-94. [PMID: 11885715 DOI: 10.1046/j.1440-1754.2001.00750.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVES To determine the inspired gas humidity during mechanical ventilation with: (i) four different humidification chambers; (ii) two airway temperature probe (ATP) positions; (iii) five different humidicrib temperatures; and (iv) insulating the inspiratory limb with bubble wrap. METHODOLOGY An observational study in the Neonatal Laboratory and Neonatal Intensive Care Unit, Westmead Hospital. The humidity of the inspired gas was measured at the proximal end of the endotracheal tube (ETT) during mechanical ventilation. Inspired humidity measurements were made with four different humidification chambers (Fisher & Paykel (F&P Healthcare Pty Ltd, Auckland, New Zealand) auto refill MR290. F&P manual refill MR310, Suruga (Suruga Inc. Humidifiers, Vincent Medical, Dongguan, China) manual refill MI-20 and MI-10F) with the humidity control (relative humidity setting) set at - 2. Measurements were made with the ATP positioned either; (A) at the distal end of the inspiratory tube inside the humidicrib or (B) outside the humidicrib 50 cm proximal to the ETT. The inspired gas temperatures were set at 36.5 degrees C and at 39.0 degrees C, respectively. For each of the different humidification chambers and ATP positions, inspired humidity measurements were made with the humidicrib temperature set at 30.8, 32.9, 35.2, 36.2, or 37.2 degrees C. Two further sets of measurements were made, one with the inspiratory limb insulated with bubble wrap and the second set without bubble wrap. RESULTS There were significant differences in inspired humidity with the four humidification chambers at both ATP positions at all humidicrib temperatures. Both Suruga humidification chambers produced significantly higher inspired gas humidities under most conditions. Positioning the ATP outside the humidicrib produced significantly higher inspired gas humidities than with the ATP inside the humidicrib. Insulating the inspiratory tubing with bubble wrap also significantly improved the inspired gas humidity. CONCLUSIONS Significant differences in inspired gas humidity were found with the humidification chambers tested. The position of the ATP and the set temperature had a significant impact on the absolute humidity of the inspired gas. In general, higher inspired gas humidities were obtained with the ATP outside the humidicrib. However, condensation of water close to the ETT appeared at low humidicrib temperatures (< 36.2 degrees C) with the ATP outside the humidicrib and extreme care should be taken that particulate water does not enter the lungs under these conditions.
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Affiliation(s)
- D A Todd
- Department of Neonatology, Westmead Hospital, Sydney, NSW, Australia.
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Todd DA, Boyd J, Lloyd J, John E. Inspired gas temperature during mechanical ventilation: effects of environmental temperature and airway temperature probe position. J Paediatr Child Health 2001; 37:495-500. [PMID: 11885716 DOI: 10.1046/j.1440-1754.2001.00749.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVES To determine the inspired gas temperature during mechanical ventilation with: (i) five different humidicrib temperatures; (ii) two airway temperature probe (ATP) positions; and (iii) four ATP adaptors. METHODOLOGY An observational study in the Neonatal Intensive Care Laboratory, Westmead Hospital. The inspired gas temperature was measured at the proximal end of the endotracheal tube (ETT) during conventional mechanical ventilation using a Tele-thermometer. Inspired gas temperature measurements were made with: (i) the humidicrib temperature set at 30.8. 32.9, 35.2, 36.2. or 37.2 degrees C; (ii) the ATP either (A) positioned inside the humidicrib at the distal end of the inspiratory tubing or (B) positioned outside the humidicrib 50 cm proximal to the ETT, with the inspired gas temperatures set at 36.5 and 39.0 degrees C, respectively; and (iii) the measurements repeated with four different ATP adaptors at each humidicrib temperature and each ATP position. RESULTS With the ATP inside the humidicrib, there were no significant differences between set and actual inspired gas temperature. However, with the ATP outside the humidicrib, there were significant decreases in inspired gas temperature at each humidicrib temperature. For instance, with the ATP outside the humidicrib and set at 39.0 degrees C, the inspired gas temperature decreased to 34.7+/-0.2 degrees C at a humidicrib temperature of 30.8 degrees C and to 37.7+/-0.2 degrees C at a humidicrib temperature of 37.2 degrees C. The type of ATP adaptor also had a significant effect on inspired gas temperature. CONCLUSIONS With the ATP placed outside the humidicrib and with variations of humidicrib temperature, infants are likely to have inspired gas temperatures that are significantly different to the desired temperature. Certain ATP adaptors cause these variations in inspired gas temperature to be more pronounced. Extreme care must be used to avoid suboptimal inspired gas temperatures with these environmental variations and the ATP positioned outside the humidicrib.
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Affiliation(s)
- D A Todd
- Department of Neonatology, Westmead Hospital, Sydney, New South Wales, Australia.
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Abstract
OBJECTIVES Firstly, to determine the accuracy of the Radiometer ABL 625 lactate electrode (Radiometer Medical Pty Ltd, Nunawading, Victoria, Australia) by comparing the lactate values obtained by this method to those obtained with the Hitachi 917 lactate analyser (Boehringer Mannheim Corporation, Charlottetown, Prince Edward Island, Canada). Secondly, to determine the effect of delay in measurement on blood lactate levels. METHODOLOGY Umbilical venous (UCV) blood samples were obtained from healthy term infants delivered vaginally. Lactate levels were measured with the Radiometer ABL 625 lactate electrode in the Neonatal Intensive Care Unit, Westmead Hospital and with the Hitachi 917 lactate analyser in 49 paired samples. In addition 26 UCV blood samples were placed in ice slurry and a further 26 samples at room temperature and blood lactate was measured at 5-min intervals for 30 min to determine the change of lactate levels with time. RESULTS The lactate levels obtained from the Radiometer ABL 625 lactate electrode were consistently lower than the levels obtained from the Hitachi 917 lactate analyser (mean difference - 0.24), but the correlation was high (r = 0.97). The blood lactate levels increased at the rate of 0.012 mmol/L per min if the blood was left at room temperature. The lactate levels remained stable for 20 min if the blood was placed in ice slurry. CONCLUSION The Radiometer ABL 625 lactate electrode was easy to use and there was high correlation with the values obtained by the standard laboratory method. The blood specimen must be place in an ice slurry if a delay in analysis is anticipated.
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Affiliation(s)
- J K Sinn
- Department of Women's Health and Newborn Care, Westmead Hospital, New South Wales, Australia.
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