1
|
Chanphai P, Froehlich E, Mandeville JS, Tajmir-Riahi HA. Protein conjugation with PAMAM nanoparticles: Microscopic and thermodynamic analysis. Colloids Surf B Biointerfaces 2016; 150:168-174. [PMID: 27914253 DOI: 10.1016/j.colsurfb.2016.11.037] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [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: 08/10/2016] [Revised: 10/03/2016] [Accepted: 11/26/2016] [Indexed: 01/05/2023]
Abstract
PAMAM dendrimers form strong protein conjugates that are used in drug delivery systems. We report the thermodynamic and binding analysis of polyamidoamine (PAMAM-G4) conjugation with human serum albumin (HSA), bovine serum albumin (BSA) and milk beta-lactoglobulin (b-LG) in aqueous solution at physiological pH. Hydrophobicity played a major role in PAMAM-protein interactions with more hydrophobic b-LG forming stronger polymer-protein conjugates. Thermodynamic parameters showed PAMAM-protein bindings occur via hydrophobic and H-bonding contacts for b-LG, while van der waals and H-bonding interactions prevail in HSA and BSA-polymer conjugates. The protein loading efficacy was 45-55%. PAMAM complexation induced major alterations of protein conformation. TEM images show major polymer morphological changes upon protein conjugation.
Collapse
Affiliation(s)
- P Chanphai
- Department of Chemistry-Biochemistry and Physics, University of Québec at Trois-Rivières, C. P. 500, TR (Quebec) Canada G9A 5H7, Canada
| | - E Froehlich
- Department of Chemistry-Biochemistry and Physics, University of Québec at Trois-Rivières, C. P. 500, TR (Quebec) Canada G9A 5H7, Canada
| | - J S Mandeville
- Department of Chemistry-Biochemistry and Physics, University of Québec at Trois-Rivières, C. P. 500, TR (Quebec) Canada G9A 5H7, Canada
| | - H A Tajmir-Riahi
- Department of Chemistry-Biochemistry and Physics, University of Québec at Trois-Rivières, C. P. 500, TR (Quebec) Canada G9A 5H7, Canada.
| |
Collapse
|
2
|
Strobel D, Bernatik T, Blank W, Will U, Reichel A, Wüstner M, Keim V, Schacherer D, Barreiros AP, Kunze G, Nürnberg D, Ignee A, Burmester E, Bunk AA, Friedrich-Rust M, Froehlich E, Schuler A, Jenssen C, Bohle W, Mauch M, Dirks K, Kaemmer J, Pachmann C, Stock J, Hocke M, Kendel A, Schmidt C, Jakobeit C, Kinkel H, Heinz W, Hübner G, Pichler M, Müller T. Incidence of bleeding in 8172 percutaneous ultrasound-guided intraabdominal diagnostic and therapeutic interventions - results of the prospective multicenter DEGUM interventional ultrasound study (PIUS study). Ultraschall Med 2015; 36:122-131. [PMID: 25876060 DOI: 10.1055/s-0034-1399282] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
PURPOSE To analyse the incidence of bleeding after percutaneous ultrasound guided diagnostic and therapeutic intraabdominal interventions in a prospective multicentre study (DEGUM percutaneous interventional ultrasound study). MATERIALS AND METHODS Within a time period of 2 years diagnostic and therapeutic intraabdominal interventions (with the exclusion of ascites paracentesis) performed percutaneously under continuous ultrasound (US) guidance were prospectively assessed using a pseudonymized standardized web site entry form. Number and type of intervention, operator experience, patient characteristics, medication, lab data as well as technical aspects of the procedure and bleeding complications were analysed according to the interventional radiology standards. RESULTS 8172 US-guided intraabdominal interventions (liver n = 5903; pancreas n = 501, kidney n = 434, lymph node = 272, biliary system n = 153, spleen n = 63, other abdominal organs and extra-organic targets n = 999) were analysed in 30 hospitals. The majority were diagnostic biopsies including 1780 liver parenchyma, 3400 focal liver lesions and 404 pancreatic lesions. 7525 interventions (92.1 %) were performed in hospitalized patients (mean age 62.6 years). Most operators were highly experienced in US-guided interventions (> 500 interventions prior to the study n = 5729; 70.1 %). Sedation was administered in 1131 patients (13.8 %). Needle diameter was ≥ 1 mm in 7162 punctures (87.9 %) with main focus on core needle biopsies (18 G, n = 4185). Clinically relevant bleeding complications with need of transfusion (0.4 %), surgical bleeding control (0.1 %) and radiological coiling (0.05 %) were very rare. Bleeding complications with fatal outcome occurred in four patients (0.05 %). The frequency of major bleeding complications was significantly higher in patients with an INR > 1.5 (p < 0.001) and patients taking a medication potentially interfering with platelet function or plasmatic coagulation (p < 0.0333). CONCLUSION This prospective multicentre study confirms the broad spectrum of percutaneous US-guided intraabdominal interventions. However diagnostic liver biopsies dominate with the use of core needle biopsies (18 G). Percutaneous US-guided interventions performed by experienced sonographers are associated with a low bleeding risk. Major bleeding complications are very rare. A pre-interventional INR < 1.5 and individual medication risk assessment are recommended.
Collapse
Affiliation(s)
- D Strobel
- Internal Medicine 1, University Hospital Erlangen, Germany
| | - T Bernatik
- Department of Internal Medicine, District Hospital Ebersberg, Germany
| | - W Blank
- Department of Internal Medicine 1, Municipal Hospital Steinenberg, Reutlingen, Germany
| | - U Will
- Department of Gastroenterology, Municipal Hospital (Waldklinikum Gera gGmbH), Gera, Germany
| | - A Reichel
- Department of Gastroenterology, Municipal Hospital (Waldklinikum Gera gGmbH), Gera, Germany
| | - M Wüstner
- Central Interdisciplinary Ultrasound, Municipal Hospital Trier (Barmherzige Brüder), Trier, Germany
| | - V Keim
- Department of Gastroenterology, Central Ultrasound Unit, University Hospital Leipzig, Germany
| | - D Schacherer
- Department of Internal Medicine 1, University Hospital Regensburg, Germany
| | - A P Barreiros
- Department of Internal Medicine 1, University Hospital Mainz, Germany
| | - G Kunze
- Department of Internal Medicine 1, Municipal Hospital (Schwarzwald-Baar), Villingen-Schwenningen, Germany
| | - D Nürnberg
- Department of Internal Medicine B, Gastroenterology, District Hospital (Ruppiner Kliniken), Neuruppin, Germany
| | - A Ignee
- Department of Internal Medicine 2, Municipal Hospital (Caritas), Bad Mergentheim, Germany
| | - E Burmester
- Department of Internal Medicine/Gastroenterology, Municipal Hospital (Sana Kliniken Lübeck GmbH), Lübeck, Germany
| | - A A Bunk
- Surgery, University Hospital Dresden, Germany
| | - M Friedrich-Rust
- Department of Internal Medicine 1, University Hospital Frankfurt, Germany
| | - E Froehlich
- Department of Internal Medicine 1, Municipal Hospital (Karl-Olga-Krankenhaus), Stuttgart, Germany
| | - A Schuler
- Department of Internal Medicine, District Hospital Helfenstein, Geislingen, Germany
| | - C Jenssen
- Department of Internal Medicine, District Hospital (Krankenhaus Märkisch Oderland GmbH), Wriezen, Germany
| | - W Bohle
- Department of Medicine and Gastroenterology, Municipal Hospital (Katharinen), Stuttgart, Germany
| | - M Mauch
- Innere Medicine, District Hospital (SRH Kliniken Sigmaringen), Sigmaringen, Germany
| | - K Dirks
- Department of Interal Medicine and Gastroenterology, District Hospital Rems-Murr, Winnenden, Germany
| | - J Kaemmer
- Depatment of Internal Medicine, Hospital St Hedwig, Berlin, Germany
| | - C Pachmann
- Department of Internal Medicine, Israeli Hospital, Hamburg, Germany
| | - J Stock
- Gastroenterology, Hospital Vivantes Humboldt, Berlin, Germany
| | - M Hocke
- Department of Medicine 2 and Gastroenterology, District Hospital Helios Meiningen, Germany
| | - A Kendel
- Department of Internal Medicine, District Hospital Gummersbach, Germany
| | - C Schmidt
- Department of Internal Medicine, Hospital Albertinen, Hamburg, Germany
| | - C Jakobeit
- Gastroenterology, St. Josefs Hospital (Helios), Bochum, Germany
| | - H Kinkel
- Department of Internal Medicine 2, Municipal Hosital Düren, Germany
| | - W Heinz
- Department of Internal Medicine, Hospital Leonberg, Germany
| | - G Hübner
- Department of Internal Medicine, District Hospital Köthen, Germany
| | - M Pichler
- Campus Innenstadt Gastroenterology, University Hospital Munich, Germany
| | - T Müller
- Department of Internal Medicine 1, Municipal Hospital Steinenberg, Reutlingen, Germany
| |
Collapse
|
3
|
Froehlich E, Mandeville JS, Arnold D, Kreplak L, Tajmir-Riahi HA. Effect of PEG and mPEG-Anthracene on tRNA Aggregation and Particle Formation. Biomacromolecules 2011; 13:282-7. [DOI: 10.1021/bm2016515] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- E. Froehlich
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières (Québec), Canada G9A 5H7
| | - J. S. Mandeville
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières (Québec), Canada G9A 5H7
| | - D. Arnold
- Department of Physics, Sir James
Dunn Building, Dalhousie University, Lord
Dalhousie Drive, Halifax, Canada NS B3H 3J5
| | - L. Kreplak
- Department of Physics, Sir James
Dunn Building, Dalhousie University, Lord
Dalhousie Drive, Halifax, Canada NS B3H 3J5
| | - H. A. Tajmir-Riahi
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières (Québec), Canada G9A 5H7
| |
Collapse
|
4
|
Froehlich E, Mandeville JS, Arnold D, Kreplak L, Tajmir-Riahi HA. PEG and mPEG–Anthracene Induce DNA Condensation and Particle Formation. J Phys Chem B 2011; 115:9873-9. [DOI: 10.1021/jp205079u] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- E. Froehlich
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières (Québec), Canada G9A 5H7
| | - J. S. Mandeville
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières (Québec), Canada G9A 5H7
| | - D. Arnold
- Department of Physics, Sir James Dunn Building, Dalhousie University, Lord Dalhousie Drive, Halifax, Canada NS B3H 3J5
| | - L. Kreplak
- Department of Physics, Sir James Dunn Building, Dalhousie University, Lord Dalhousie Drive, Halifax, Canada NS B3H 3J5
| | - H. A. Tajmir-Riahi
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières (Québec), Canada G9A 5H7
| |
Collapse
|
5
|
Froehlich E, Mandeville JS, Weinert CM, Kreplak L, Tajmir-Riahi HA. Bundling and Aggregation of DNA by Cationic Dendrimers. Biomacromolecules 2010; 12:511-7. [DOI: 10.1021/bm1013102] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- E. Froehlich
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières (Québec), Canada G9A 5H7, and Department of Physics, Sir James Dunn Building, Dalhousie University Lord Dalhousie Drive, Halifax, Canada NS B3H 3J5
| | - J. S. Mandeville
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières (Québec), Canada G9A 5H7, and Department of Physics, Sir James Dunn Building, Dalhousie University Lord Dalhousie Drive, Halifax, Canada NS B3H 3J5
| | - C. M. Weinert
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières (Québec), Canada G9A 5H7, and Department of Physics, Sir James Dunn Building, Dalhousie University Lord Dalhousie Drive, Halifax, Canada NS B3H 3J5
| | - L. Kreplak
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières (Québec), Canada G9A 5H7, and Department of Physics, Sir James Dunn Building, Dalhousie University Lord Dalhousie Drive, Halifax, Canada NS B3H 3J5
| | - H. A. Tajmir-Riahi
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, Trois-Rivières (Québec), Canada G9A 5H7, and Department of Physics, Sir James Dunn Building, Dalhousie University Lord Dalhousie Drive, Halifax, Canada NS B3H 3J5
| |
Collapse
|
6
|
Mischinger J, Froehlich E, Griesbacher A, Pummer K, Mannweiler S, Zigeuner R, Lipsky K. Prognostic relevance of B7H1 and B7H3 protein expressions in metastatic clear cell renal cell carcinoma. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e15074] [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: 11/20/2022] Open
|
7
|
|
8
|
Affiliation(s)
- E. Froehlich
- Département de Chimie-Biologie, Université du Québec à Trois-Rivières, C. P. 500, Trois-Rivières (Québec), G9A 5H7, Canada, and Department of Chemistry, Missouri State University, Springfield, Missouri 65897
| | - J. S. Mandeville
- Département de Chimie-Biologie, Université du Québec à Trois-Rivières, C. P. 500, Trois-Rivières (Québec), G9A 5H7, Canada, and Department of Chemistry, Missouri State University, Springfield, Missouri 65897
| | - C. J. Jennings
- Département de Chimie-Biologie, Université du Québec à Trois-Rivières, C. P. 500, Trois-Rivières (Québec), G9A 5H7, Canada, and Department of Chemistry, Missouri State University, Springfield, Missouri 65897
| | - R. Sedaghat-Herati
- Département de Chimie-Biologie, Université du Québec à Trois-Rivières, C. P. 500, Trois-Rivières (Québec), G9A 5H7, Canada, and Department of Chemistry, Missouri State University, Springfield, Missouri 65897
| | - H. A. Tajmir-Riahi
- Département de Chimie-Biologie, Université du Québec à Trois-Rivières, C. P. 500, Trois-Rivières (Québec), G9A 5H7, Canada, and Department of Chemistry, Missouri State University, Springfield, Missouri 65897
| |
Collapse
|
9
|
|
10
|
Abstract
Oseltamivir is a novel agent approved for the treatment and prevention of influenza infection and illnesses in adults and children. Assessment of data from the clinical trial programme, a US health insurance database study and postmarketing surveillance allowed a comprehensive review of the safety of oseltamivir in clinical use in subjects >1 year of age. Oseltamivir has been studied over the course of a 5-year development programme in >11000 subjects from North America, Europe and the Southern Hemisphere, including otherwise healthy adults, approximately 500 elderly/high-risk subjects, and children (>1000) aged 1-12 years. Safety evaluations included treatment-emergent adverse events, hospitalisations and deaths, as well as haematological and biochemical laboratory safety tests. The data reveals that oseltamivir has simple, uncomplicated pharmacology and lacks potential for drug-drug interactions. Electrocardiogram parameters, including corrected QT interval, were unaffected by oseltamivir even at high doses. Postmarketing studies confirmed that transient gastrointestinal disturbance is the major adverse effect of oseltamivir and that this can be reduced by taking oseltamivir after a light snack. On treatment serious adverse events were reported in 1.3% of oseltamivir 75mg twice daily, 0.7% of oseltamivir 150 mg twice daily and 1.2% of placebo recipients, respectively, in the clinical trial programme. Postmarketing, it is estimated that, to date, over 4 million oseltamivir prescriptions have been dispensed worldwide. Approximately 2300 spontaneous reports were received by the manufacturer over the three winter seasons of use. As these events are reported infrequently and from an unknown number of users, it is not possible to definitively assess causality or frequency of reported events. Most reports were of gastrointestinal and skin reactions. However, a clear association between the skin reactions and oseltamivir has not been established. A large study of insurance records, which permitted the assessment of the relative risk of medical events treated in the month following prescription of oseltamivir in general use, showed no evidence of increased risk of cardiac, neuropsychiatric or respiratory events for those receiving oseltamivir compared with those who did not. To conclude, no important safety concerns have evolved which might limit the suitability of oseltamivir for the treatment and prevention of influenza in all patient populations.
Collapse
|
11
|
|
12
|
Krinke G, Froehlich E, Herrmann M, Schnider K, Da Silva F, Suter J, Traber K. Adjustment of the myelin sheath to axonal atrophy in the rat spinal root by the formation of infolded myelin loops. Acta Anat (Basel) 1988; 131:182-7. [PMID: 3376720 DOI: 10.1159/000146510] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Atrophy of the L4 dorsal and ventral spinal roots was experimentally induced by unilateral sciatic neurectomy in groups of young (2 and 4 months) and older (12 months) albino rats. During the 4 months following neurectomy, the occurrence of infolded myelin loops (IMLs) was quantitatively examined in transverse sections prepared using perfusion fixation with glutaraldehyde and embedding in epoxy resin. The number of IMLs was higher on the operated side and increased with the time of survival and the age of the animals. The formation of IMLs is a characteristic early response of a large-caliber myelin sheath to axonal atrophy, probably reflecting the presence of redundant myelin.
Collapse
Affiliation(s)
- G Krinke
- Ciba-Geigy AG, Basel, Switzerland
| | | | | | | | | | | | | |
Collapse
|
13
|
Zakova N, Zak F, Froehlich E, Hess R. Evaluation of skin carcinogenicity of technical 2,2-bis-(p-glycidyloxyphenyl)-propane in CF1 mice. Food Chem Toxicol 1985; 23:1081-9. [PMID: 4076938 DOI: 10.1016/0278-6915(85)90056-0] [Citation(s) in RCA: 10] [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
The carcinogenic potential of a technical-grade epoxy resin, Araldite GY 250, of which the diglycidyl ether of bisphenol A (DGEBPA) is the main component, was investigated in CF1 mice. Groups of 50 male and 50 female mice were treated for 2 yr by repeated epidermal application of a 1 or 10% (v/v) solution in acetone. The controls, 50 mice of each sex, were treated with acetone alone. The treatment had no effect on survival and no excess incidence of skin tumours occurred. A positive control group of 50 male and 50 female CF1 mice was treated by epidermal application of 2% (v/v) beta-propiolactone in acetone. In this group there was a high incidence of malignant skin tumours at the site of application and, consequently, increased mortality. Treatment with neither DGEBPA technical nor beta-propiolactone induced systemic neoplasia.
Collapse
|
14
|
Lorant IS, Froehlich E. Über die Wirkung von Intravenösen Zuckerinjektionen auf die Ketonurie bei Diabetes Mellitus und bei Diabetischem Koma. J Mol Med (Berl) 1930. [DOI: 10.1007/bf01724353] [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]
|
15
|
Froehlich E. Zur Begutachtung unfallverletzter Rentenempfänger auf Grund der Kriegserfahrungen. Dtsch Med Wochenschr 1916. [DOI: 10.1055/s-0028-1135360] [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]
|
16
|
Froehlich E. Ueber Gynoval, ein neues Baldrianpräparat. Dtsch Med Wochenschr 1909. [DOI: 10.1055/s-0029-1201708] [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]
|