1
|
Schulz KL, Kesting MR, Nobis CP, Matta R, Lutz R. Three-dimensional evaluation of condylar position after mandibular reconstruction with a fibula free flap—comparison of different surgical techniques. Int J Oral Maxillofac Surg 2022; 52:648-655. [PMID: 36274023 DOI: 10.1016/j.ijom.2022.10.003] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 07/18/2022] [Accepted: 10/04/2022] [Indexed: 11/06/2022]
Abstract
Three-dimensional positional changes of the temporomandibular joint after mandible reconstruction using microvascular fibula flaps were investigated in 58 patients. The results of preoperative virtually planned surgery, intraoperative resection- and cutting-guided surgery, and non-guided surgery were compared. Pre- and postoperative computed tomography data of each patient were processed and superimposed digitally. The condyle deviations and rotations along the axes and planes of the skull, as well as Euclidean distances, were determined. Reliability analyses, descriptive statistics, and non-parametric tests were performed with the alpha level set at P = 0.05. Reliability proved to be excellent for all variables. The median Euclidean distance was 2.07 mm for the left condyle and 2.11 mm for the right condyle. Deviations of ≥ 10 mm occurred in nine (16%) cases. The maximum deviation occurred in the horizontal plane and the least deviation in the sagittal plane. Median rotation was ≤ 1.4° around all axes. The condylar displacements did not differ significantly between the different surgical techniques investigated. The three-dimensional measurement method applied is highly reliable for evaluating the three-dimensional condylar position after mandibular reconstruction.
Collapse
Affiliation(s)
- K L Schulz
- Department of Oral and Maxillofacial Surgery, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - M R Kesting
- Department of Oral and Maxillofacial Surgery, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - C-P Nobis
- Department of Oral and Maxillofacial Surgery, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - R Matta
- Department of Prosthodontics, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - R Lutz
- Department of Oral and Maxillofacial Surgery, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Erlangen, Germany.
| |
Collapse
|
2
|
Skrabal J, Rizzo W, Hanson C, Anderson-Berry A, Bilek L, Lutz R. Use of the Simplified Diet Method to Improve Metabolic Control Among Teens and Adults with Phenylketonuria: A Mixed Methods Approach. J Acad Nutr Diet 2022. [DOI: 10.1016/j.jand.2022.06.117] [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: 10/15/2022]
|
3
|
Nobis CP, Lutz R, Weber M, Preidl R, Goetze E, Frohwitter G, Kesting M. Performance of different osteosynthesis materials in microvascular fibula free flap reconstruction. Br J Oral Maxillofac Surg 2021; 60:623-628. [DOI: 10.1016/j.bjoms.2021.10.013] [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] [Received: 07/21/2021] [Accepted: 10/30/2021] [Indexed: 10/19/2022]
|
4
|
Frohwitter G, Lutz R, Baran C, Weber M, Nobis CP, Rau A, Kesting M. Consistent Value of Two-Stage Pedicle Flaps in the Age of Microsurgical Maxillofacial Reconstruction. J Maxillofac Oral Surg 2021; 22:98-104. [PMID: 37041957 PMCID: PMC10082879 DOI: 10.1007/s12663-021-01635-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 08/10/2021] [Indexed: 11/29/2022] Open
Abstract
Abstract
Introduction
Up to the second half of the twentieth century, pedicled flaps marked the gold standard in reconstructive surgery. Followed by the introduction of microsurgical techniques, these flaps were increasingly abandoned. We conducted a retrospective study to determine the value of two-stage pedicle flaps in modern maxillofacial reconstruction.
Material & Methods
A chart review from October 2017 to November 2020 was performed to identify patients who were treated by a two-stage pedicle flap in our Department of Oral and Maxillofacial Surgery.
Results
A total of 31 patients, 17 female and 14 males received 36 two-stage pedicle flaps. All patients were in noticeably impaired health condition with a majority of ASA-score 3. The defect location mainly contained extraoral resections (58.3%). A variety of flaps were harvested consisting of buccal flaps, Abbe flaps, forehead flaps, deltopectoral flaps, nasolabial flaps, and a tubed flap.
Discussion
The study outlines two indications for the use of two-stage pedicle flaps. Firstly, as a back-up strategy in heavily pre-treated wound beds and secondly in an almost contrarily indication as a first-choice reconstructive option of the facial skin in esthetic demanding cases.
Conclusion
The timesaving and straight forward surgical approach as well as their low postsurgical complications and strong long-time success rates secure the two-stage pedicle flap a justified niche role in times of microsurgical maxillofacial reconstruction.
Collapse
Affiliation(s)
- G Frohwitter
- Department for Oral and Maxillofacial Surgery, University Hospital Erlangen, Glueckstrasse 11, 91054 Erlangen, Germany
| | - R Lutz
- Department for Oral and Maxillofacial Surgery, University Hospital Erlangen, Glueckstrasse 11, 91054 Erlangen, Germany
| | - C Baran
- Department for Oral and Maxillofacial Surgery, University Hospital Erlangen, Glueckstrasse 11, 91054 Erlangen, Germany
| | - M Weber
- Department for Oral and Maxillofacial Surgery, University Hospital Erlangen, Glueckstrasse 11, 91054 Erlangen, Germany
| | - C P Nobis
- Department for Oral and Maxillofacial Surgery, University Hospital Erlangen, Glueckstrasse 11, 91054 Erlangen, Germany
| | - A Rau
- Department for Oral and Maxillofacial Surgery, University Hospital Greifswald, Greifswald, Germany
| | - M Kesting
- Department for Oral and Maxillofacial Surgery, University Hospital Erlangen, Glueckstrasse 11, 91054 Erlangen, Germany
| |
Collapse
|
5
|
Baertsch MA, Lutz R, Raab MS, Weinhold N, Goldschmidt H. Meeting report of the 7th Heidelberg Myeloma Workshop: today and tomorrow. J Cancer Res Clin Oncol 2019; 145:2445-2455. [PMID: 31407112 DOI: 10.1007/s00432-019-02998-w] [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: 06/09/2019] [Accepted: 08/05/2019] [Indexed: 11/28/2022]
Abstract
PURPOSE The 7th Heidelberg Myeloma Workshop was held on April 5th and 6th, 2019 at the University Hospital Heidelberg. METHODS AND RESULTS Main topics of the meeting were (1) diagnostics and prognostic factors, (2) role of immunotherapy in multiple myeloma (MM), (3) current therapy of MM, (4) biology and genomics of MM as well as (5) novel treatment concepts. A debate on the status of minimal residual disease (MRD) driven therapy was held. CONCLUSION Diagnostics and treatment of newly diagnosed and relapsed MM are continuously evolving. While advances in the field of (single cell) genetic analysis now allow for characterization of the disease at an unprecedented resolution, immunotherapeutic approaches and MRD testing are at the forefront of the current clinical trial landscape.
Collapse
Affiliation(s)
- M A Baertsch
- Hematology, Oncology and Rheumatology, University Hospital Heidelberg, Heidelberg, Germany.
| | - R Lutz
- Hematology, Oncology and Rheumatology, University Hospital Heidelberg, Heidelberg, Germany
| | - M S Raab
- Hematology, Oncology and Rheumatology, University Hospital Heidelberg, Heidelberg, Germany.,Clinical Cooperation Unit Molecular Hematology/Oncology, German Cancer Research Center, Heidelberg, Germany
| | - N Weinhold
- Hematology, Oncology and Rheumatology, University Hospital Heidelberg, Heidelberg, Germany
| | - H Goldschmidt
- Hematology, Oncology and Rheumatology, University Hospital Heidelberg, Heidelberg, Germany.,National Center for Tumor Diseases, Heidelberg University Hospital, Heidelberg, Germany
| |
Collapse
|
6
|
Farmer MT, Bunt R, Corradini M, Ellison P, Francis M, Gabor J, Gauntt R, Henry C, Linthicum R, Luangdilok W, Lutz R, Paik C, Plys M, Rabiti C, Rempe J, Robb K, Wachowiak R. Reactor Safety Gap Evaluation of Accident-Tolerant Components and Severe Accident Analysis. NUCL SCI ENG 2017. [DOI: 10.13182/nse16-13] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - R. Bunt
- Southern Nuclear, Birmingham, Alabama
| | | | | | - M. Francis
- Oak Ridge National Laboratory, Oak Ridge, Tennessee
| | - J. Gabor
- Jensen Hughes, Baltimore, Maryland
| | - R. Gauntt
- Sandia National Laboratories, Albuquerque, New Mexico
| | - C. Henry
- Fauske and Associates, Burr Ridge, Illinois
| | | | | | - R. Lutz
- Lutz Consulting, Hendersonville, North Carolina
| | - C. Paik
- Fauske and Associates, Burr Ridge, Illinois
| | - M. Plys
- Fauske and Associates, Burr Ridge, Illinois
| | - C. Rabiti
- Idaho National Laboratory, Idaho Falls, Idaho
| | - J. Rempe
- Rempe and Associates, LLC, Idaho Falls, Idaho
| | - K. Robb
- Oak Ridge National Laboratory, Oak Ridge, Tennessee
| | - R. Wachowiak
- Electric Power Research Institute, Palo Alto, California
| |
Collapse
|
7
|
Prueksaritanont T, Tatosian DA, Chu X, Railkar R, Evers R, Chavez-Eng C, Lutz R, Zeng W, Yabut J, Chan GH, Cai X, Latham AH, Hehman J, Stypinski D, Brejda J, Zhou C, Thornton B, Bateman KP, Fraser I, Stoch SA. Validation of a microdose probe drug cocktail for clinical drug interaction assessments for drug transporters and CYP3A. Clin Pharmacol Ther 2016; 101:519-530. [DOI: 10.1002/cpt.525] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 09/21/2016] [Accepted: 09/23/2016] [Indexed: 12/27/2022]
Affiliation(s)
- T Prueksaritanont
- Department of Pharmacokinetics; Pharmacodynamics, and Drug Metabolism, Merck & Co; Kenilworth New Jersey USA
- Faculty of Pharmaceutical Sciences; Chulalongkorn University; Bangkok Thailand
| | - DA Tatosian
- Department of Pharmacokinetics; Pharmacodynamics, and Drug Metabolism, Merck & Co; Kenilworth New Jersey USA
| | - X Chu
- Department of Pharmacokinetics; Pharmacodynamics, and Drug Metabolism, Merck & Co; Kenilworth New Jersey USA
| | - R Railkar
- Department of Biostatistics and Research Decision Sciences; Merck & Co; Kenilworth New Jersey USA
| | - R Evers
- Department of Pharmacokinetics; Pharmacodynamics, and Drug Metabolism, Merck & Co; Kenilworth New Jersey USA
| | - C Chavez-Eng
- Department of Pharmacokinetics; Pharmacodynamics, and Drug Metabolism, Merck & Co; Kenilworth New Jersey USA
| | - R Lutz
- Department of Pharmacokinetics; Pharmacodynamics, and Drug Metabolism, Merck & Co; Kenilworth New Jersey USA
| | - W Zeng
- Department of Pharmacokinetics; Pharmacodynamics, and Drug Metabolism, Merck & Co; Kenilworth New Jersey USA
| | - J Yabut
- Department of Pharmacokinetics; Pharmacodynamics, and Drug Metabolism, Merck & Co; Kenilworth New Jersey USA
| | - GH Chan
- Department of Pharmacokinetics; Pharmacodynamics, and Drug Metabolism, Merck & Co; Kenilworth New Jersey USA
| | - X Cai
- Department of Pharmacokinetics; Pharmacodynamics, and Drug Metabolism, Merck & Co; Kenilworth New Jersey USA
| | - AH Latham
- Department of Pharmaceutical Sciences and Clinical Supply; Merck & Co; Kenilworth New Jersey USA
| | - J Hehman
- Department of Pharmaceutical Sciences and Clinical Supply; Merck & Co; Kenilworth New Jersey USA
| | - D Stypinski
- Data Management and Biometrics; Celerion; Lincoln Nebraska USA
| | - J Brejda
- Data Management and Biometrics; Celerion; Lincoln Nebraska USA
| | - C Zhou
- Data Management and Biometrics; Celerion; Lincoln Nebraska USA
| | - B Thornton
- Department of Translational Pharmacology Clinical Operations; Merck & Co; Kenilworth New Jersey USA
| | - KP Bateman
- Department of Pharmacokinetics; Pharmacodynamics, and Drug Metabolism, Merck & Co; Kenilworth New Jersey USA
| | - I Fraser
- Department of Pharmacokinetics; Pharmacodynamics, and Drug Metabolism, Merck & Co; Kenilworth New Jersey USA
- Abide Therapeutics; San Diego California USA
| | - SA Stoch
- Department of Translational Pharmacology; Merck & Co; Kenilworth New Jersey USA
| |
Collapse
|
8
|
Ferraretto LF, Shaver RD, Lauer JG, Brown L, Lutz R, Kennicker J, Schmidt R, Taysom DM. 0629 Influence of plant population, maturity and ensiling time on fermentation profile, nitrogen fractions, and starch digestibility in earlage. J Anim Sci 2016. [DOI: 10.2527/jam2016-0629] [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: 11/13/2022] Open
|
9
|
Mitsimponas KT, Moest T, Iliopoulos C, Rueger T, Mueller C, Lutz R, Shakib K, Neukam FW, Schlegel KA. Search for a reliable model for bisphosphonate-related osteonecrosis of the jaw: establishment of a model in pigs and description of its histomorphometric characteristics. Br J Oral Maxillofac Surg 2016; 54:883-888. [PMID: 27282083 DOI: 10.1016/j.bjoms.2016.05.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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: 06/16/2015] [Accepted: 05/24/2016] [Indexed: 11/19/2022]
Abstract
The pathogenesis of bisphosphonate-related osteonecrosis of the jaw (BRONJ) remains unknown, and the development of a reliable experimental model would help to improve our understanding of it. We used 12 domestic pigs of which 6 made up the experimental group and were treated with zoledronate 4mg intravenously weekly for 5 weeks, while the control group (n=6) were given no drugs. On day 60 the right second maxillary and mandibular third molars were extracted. Thirty days later 3 animals in each group were killed; the rest were killed 90 days later. Histopathological specimens from the extraction sites were analysed for bone density, collagen architecture, density of osteons, and the amount of non-mineralised bone. Bone density, amount of non-mineralised bone, and density of osteons differed significantly between the 2 groups (p<0.001 in each case), but the chromatic pattern dictated by the collagen architecture did not. Our results correspond to the observations that have been made in patients with BRONJ, which means that the histomorphometric conditions seen in patients can be reproduced in this experimental setting.
Collapse
Affiliation(s)
- K T Mitsimponas
- Department of Oral and Maxillofacial Surgery, University Hospital of Erlangen, Glueckstrasse 11, 91054, Erlangen, Germany; Department of Oral and Maxillofacial Surgery, Royal Free NHS Trust, Chase Farm Hospital, 127 The Ridgeway, Enfield, Middlesex EN2 8JL, UK.
| | - T Moest
- Department of Oral and Maxillofacial Surgery, University Hospital of Erlangen, Glueckstrasse 11, 91054, Erlangen, Germany
| | - C Iliopoulos
- Department of Oral and Maxillofacial Surgery, University Hospital of Erlangen, Glueckstrasse 11, 91054, Erlangen, Germany
| | - T Rueger
- Department of Oral and Maxillofacial Surgery, University Hospital of Erlangen, Glueckstrasse 11, 91054, Erlangen, Germany
| | - C Mueller
- Department of Oral and Maxillofacial Surgery, University Hospital of Erlangen, Glueckstrasse 11, 91054, Erlangen, Germany
| | - R Lutz
- Department of Oral and Maxillofacial Surgery, University Hospital of Erlangen, Glueckstrasse 11, 91054, Erlangen, Germany
| | - K Shakib
- Department of Oral and Maxillofacial Surgery, Royal Free NHS Trust, Chase Farm Hospital, 127 The Ridgeway, Enfield, Middlesex EN2 8JL, UK
| | - F W Neukam
- Department of Oral and Maxillofacial Surgery, University Hospital of Erlangen, Glueckstrasse 11, 91054, Erlangen, Germany
| | - K A Schlegel
- Department of Oral and Maxillofacial Surgery, University Hospital of Erlangen, Glueckstrasse 11, 91054, Erlangen, Germany
| |
Collapse
|
10
|
Hartmann G, Kumar S, Johns D, Gheyas F, Gutstein D, Shen X, Burton A, Lederman H, Lutz R, Jackson T, Chavez-Eng C, Mitra K. Disposition into Adipose Tissue Determines Accumulation and Elimination Kinetics of the Cholesteryl Ester Transfer Protein Inhibitor Anacetrapib in Mice. Drug Metab Dispos 2015; 44:428-34. [DOI: 10.1124/dmd.115.067736] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 12/23/2015] [Indexed: 12/31/2022] Open
|
11
|
Hasselbach W, Hofschneider HP, Kasper E, Lutz R. Die Sol-Gel-Umwandlung von gereinigtem Aktomyosin und von Aktomyosin während der Extraktion frischer und glycerinbehandelter Muskelfasern in Abhängigkeit von Ionalität, Ionenstärke und AT. Zeitschrift für Naturforschung B 2014. [DOI: 10.1515/znb-1953-0406] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
1. Es wird die Löslichkeit von Aktomyosin in einem Intervall der lonenstärke von etwa 0,1-0,4 μ mit und ohne ATP studiert, um präzise Daten über den Übergang aus dem kontraktionsfähigen Gel - in den dissoziationsfähigen Solzustand zu bekommen. Die Löslichkeit und Fähigkeit zur Superpräcipitation in Lösungen verschiedener lonalität werden dargestellt als Abhängigkeit dieser Eigenschaften von der lonenstärke der Systeme.
2. Ohne ATP hängt die Löslichkeit gereinigten Aktomyosins außer von der lonenstärke nur vom pH ab.
3. Sie hängt von der Ionenstärke völlig gleichartig ab, wenn ein Teil der K-Ionen durch Mg++ oder Ca++ ersetzt wird (bis zu einer Ionenstärke der Erdalkalien von 0,09 u). Dasselbe gilt für den Ersatz des Cl-Ions durch Pyrophosphat bis zu einer Ionenstärke von 0,26 μ. Ein weitergehender Ersatz wurde nicht geprüft.
4. Die Abhängigkeit der Gel-Sol-Umwandlung von der Ionenstärke wird ebenfalls (zwischen 0° und 20° C) nicht von der Temperatur und auch nicht vom Alter der Aktomyosinlösung beeinflußt. Die Umwandlung erfolgt immer zwischen 0,2 und 0,3 μ.
5. Dagegen verschiebt sich der Umwandlungsbereich sehr erheblich zu niedrigen Werten der lonenstärke, wenn ATP zugegen ist. In Anwesenheit von 5·10-3-m. ATP sinkt die lonenstärke der Umwandlung um etwa 0,1 u. Der Umwandlungsbereich reicht dann von etwa 0,1-0,2 μ statt von 0,2-0,3 µ (pH 7).
6. Dagegen hört die Fähigkeit der Superpräcipitation in Gegenwart von 5·10-3-m. ATP bereits bei etwa 0,15 µ auf und beträgt auch bei 0,08 u erst ein Drittel des Wertes, der bei dieser lonenstärke mit 1·10-3-m. ATP gefunden wird. Erhöhung der ATP-Konzentration setzt die Superpräcipitation bereits bei so niedrigen lonenstärken herab, daß eine Erhöhung der Löslichkeit noch nicht spürbar ist. Außerdem wird die Superpräcipitation - im Gegensatz zur Löslichkeit - bereits durch 0,003-m. Mg++ beeinflußt: Sie wird in 5·10-3-m. ATP-Lösungen durch Mg++ noch weiter herabgedrückt.
7. Also beruht die Änderung der Superpräcipitationsfähigkeit und der fermentativen Eigenschaften bei der Gel-Sol-Umwandlung nicht darauf, daß das Gel in Lösung geht. Es gibt lonalitäten, bei denen das Gel noch nicht gelöst ist, aber schon unfähig ist zur Superpräcipitation, und bei denen die ATPase-Aktivität ebenfalls stark gemindert ist.
8. Der Anteil des Aktomyosins, der in ATP-Anwesenheit gelöst wird. ist immer dissoziiert - selbst wenn die lonenstärke der Lösung unterhalb von 0,15 µ liegt.
9. Die Extrahierbarkeit des Aktomyosins aus den hochkonzentrierten Strukturen der frischen Muskelfaser mit ihrem ATP-Gehalt ~ 1·10-3-m. (Brei zu ATP-freier Extraktionslösung = 1 : 4) ist bei 0,2 µ merklich und bei 0,4 µ erschöpfend, falls der Muskel mit dem Blendor zerkleinert ist.
10. Wenn die Extraktionslösung 6·10-3-m. ATP enthält, sind bereits bei 0,12 µ 40% des Aktomyosins extrahierbar.
11. Aus dem geblendorten Brei wird das Myosin als Aktomyosin extrahiert (pH 7). Nach Latapiezerkleinerung wird die extrahierte Menge kleiner, und es handelt sich um fast reines L-Myosin.
12. In 27-proz. Glycerinlösung hergestellte Modellfasern geben bei niedriger und mittlerer lonenstärke viel weniger Aktomyosin ab. Erschöpfende Extraktion ist erst durch lonenstärken ≥1.2 µ möglich. Selbst bei dieser lonenstärke können dann nur 80% des Aktomyosins extrahiert werden. wenn die Fasern zusätzlich noch 5 Tage in 80-proz. Glycerin aufgehoben sind.
13. Die Abhängigkeit der Löslichkeit vom Alter der Präparate und der Vergleich mit der Löslichkeit des ATP-freien gereinigten Aktomyosins zeigt. daß diese Löslichkeitsminderung nicht allein auf ATP-Mangel beruht, sondern auch auf einer Erhöhung der Kohäsionskräfte während der Vorgeschichte.
14. Diese Synaerese-Wirkungen können durch 0,016-m. Pyrophosphat ganz oder weitgehend beseitigt werden: Das Aktomyosin der Glycerinfaser ist dann wieder bei 0,6 μ voll extrahierbar.
15. In Gegenwart von 8·10-3-m. ATP sinkt die lonenstärke, bei der das Aktomyosin voll extrahiert werden kann, wieder auf etwa den gleichen Wert wie bei der Extraktion frischen Muskels unter gleichen Bedingungen. Die Aktomyosinlöslichkeit scheint unter diesen Bedingungen der Löslichkeit des gereinigten Myosins ungefähr gleich zu sein.
Collapse
Affiliation(s)
- W. Hasselbach
- Aus dem Physiologischen Institut der Universität Tübingen
| | | | - E. Kasper
- Aus dem Physiologischen Institut der Universität Tübingen
| | - R. Lutz
- Aus dem Physiologischen Institut der Universität Tübingen
| |
Collapse
|
12
|
Lutz R, Prechtl C, Nonhoff J, Weisel T, Damien CJ, Schlegel KA. Biofunctionalization of the implant surface with different concentrations of a synthetic peptide (P-15). Clin Oral Implants Res 2012; 24:781-6. [PMID: 22458517 DOI: 10.1111/j.1600-0501.2012.02455.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/25/2012] [Indexed: 11/29/2022]
Abstract
OBJECTIVE This study aimed at identifying the ideal concentration of a biofunctional surface coating of dental implants with a synthetic peptide (P-15). In a previous study, P-15 was shown to enhance osseointegration parameters. MATERIAL AND METHODS Implants (modified ANKYLOS(®) A8; FRIADENT Plus(®) surface) with five different concentrations (0-400 μg/ml) of a P-15 coating as well as uncoated controls were inserted in the frontal bone of 45 adult domestic pigs. The histomorphometric and microradiographic findings for the coated implants were compared to those for the uncoated ones after 7, 14, and 30 days. RESULTS No significant differences were observed comparing the peri-implant bone density between the coated and uncoated implants The bone-to-implant contact, as the primary histological parameter for osseointegration, showed high rates for all surfaces investigated (between 73.3 ± 17.9% for the control and 81.9 ± 15.2% for P15 20 μg/ml after 30 days). CONCLUSIONS No significant benefit on osseointegration of a biofunctional P-15 coating of dental implants could be displayed in the present study.
Collapse
Affiliation(s)
- R Lutz
- Department of Oral and Maxillofacial Surgery, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany.
| | | | | | | | | | | |
Collapse
|
13
|
Schlegel KA, Prechtl C, Möst T, Seidl C, Lutz R, von Wilmowsky C. Osseointegration of SLActive implants in diabetic pigs. Clin Oral Implants Res 2011; 24:128-34. [PMID: 22111960 DOI: 10.1111/j.1600-0501.2011.02380.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/20/2011] [Indexed: 12/01/2022]
Abstract
OBJECTIVES Diabetes mellitus is currently classified as a relative contraindication for implant treatment because of microangiopathies with the consequence of impaired bone regeneration and higher rates of implant failure. The study aim was to investigate peri-implant bone formation in a diabetic animal model in comparison to healthy animals and to evaluate the differences between conventional (SLA(®) ) and modified (SLActive(®) ) titanium implant surfaces on osseointegration. MATERIAL AND METHODS Each six implants were placed in the calvaria of 11 diabetic and 4 healthy domestic pigs. At 30 and 90 days after implant placement, the bone-to-implant contact (BIC) and bone density (BD) were appraised. Additionally, the expression of the bone-matrix proteins collagen type I and osteocalcin was evaluated at both points in time by using immunohistochemical staining methods. RESULTS Overall, BIC was reduced in the diabetic group at 30 and 90 days. After 90 days, the SLActive(®) implants showed significantly higher BICs compared with the SLA(®) implants in diabetic animals. Peri-implant BD was higher in the SLActive(®) group at 30 and 90 days in healthy and diabetic animals. Collagen type I protein expression was higher using SLA(®) implants in diabetic pigs at 30 days. Values for osteocalcin expression were not consistent. CONCLUSIONS The results indicate the negative effect of untreated diabetes mellitus on early osseointegration of dental implants. The modified SLA(®) surface (SLActive(®) ) elicited an accelerated osseointegration of dental implants, suggesting that a better prognosis for implant treatment of diabetic patients is possible.
Collapse
Affiliation(s)
- K A Schlegel
- Department of Oral and Maxillofacial Surgery, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | | | | | | | | | | |
Collapse
|
14
|
Lutz R, Srour S, Nonhoff J, Weisel T, Damien CJ, Schlegel KA. Biofunctionalization of titanium implants with a biomimetic active peptide (P-15) promotes early osseointegration. Clin Oral Implants Res 2010; 21:726-34. [PMID: 20636727 DOI: 10.1111/j.1600-0501.2009.01904.x] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
OBJECTIVES The early stages of peri-implant bone formation play an essential role in the osseointegration and long-term success of dental implants. By incorporating bioactive coatings, this biofunctionalization of implant surfaces may enhance the attachment of the implant to the surrounding bone and stimulate bone regeneration. MATERIAL AND METHODS To demonstrate faster osseointegration, the surfaces of dental implants were grit-blasted and acid-etched. They were then coated with hydroxyapatite (HA) and experimental implants were further coated with a biomimetic active peptide (P-15) in one of two concentrations. These biofunctionalized samples and controls with no peptide were placed in the forehead region of 12 adult pigs. Six animals were evaluated for a period of 14 or 30 days. RESULTS Histomorphometric analysis demonstrated that the implants with the high concentration of P-15 had significantly higher percentage of bone-to-implant contact (BIC) at 14 (P=0.018) and 30 (P=0.015) days compared with the other groups. Both concentrations of P-15 showed increased peri-implant bone density compared to the control group at 30 days. CONCLUSION Biofunctionalization of the implant surface with a biomimetic active peptide leads to significantly increased BIC rates at 14 and 30 days and higher peri-implant bone density at 30 days.
Collapse
Affiliation(s)
- R Lutz
- Department of Oral and Maxillofacial Surgery, University of Erlangen-Nuremberg, Erlangen, Germany.
| | | | | | | | | | | |
Collapse
|
15
|
Lutz R, Aserin A, Wicker L, Garti N. Structure and physical properties of pectins with block-wise distribution of carboxylic acid groups. Food Hydrocoll 2009. [DOI: 10.1016/j.foodhyd.2008.04.009] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
16
|
Wilson JE, Kiselanova N, Stevens Q, Lutz R, Mandler T, Tran ZV, Wischmeyer PE. A survey of inhalational anaesthetic abuse in anaesthesia training programmes. Anaesthesia 2008; 63:616-20. [PMID: 18477273 DOI: 10.1111/j.1365-2044.2008.05444.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
This study aims to assess the prevalence and outcomes of inhalational anaesthetic abuse among anaesthesia training programmes. Online surveys were completed by chairpersons of academic anaesthesia training programmes in the United States. The response rate was 84% (106/126 programmes). Twenty-two percent of the departments had had at least one incident of inhalational anaesthetic abuse. Forty-eight percent (15/31) of the persons abusing inhalational anaesthetics were sent for rehabilitation. Only 22% (7/31) of those found to be abusing inhalational anaesthetics were ultimately able to return successfully to anaesthesia practice with sustained recovery. The mortality rate among individuals found abusing inhalational anaesthetics was 26% (8/31). The majority of the anaesthesia departments (97/104, 93%) did not have any pharmacy accounting of inhalational anaesthetics. This is the first published survey of inhalational anaesthesia abuse. Inhalational anaesthetic abuse should be considered in at-risk individuals or those with a history of substance abuse. The concern about substance abuse is not unique to American anaesthetists. Countries around the world deal with similar substance abuse issues.
Collapse
Affiliation(s)
- J E Wilson
- Department of Anaesthesia, University of Colorado Health Sciences Center, Denver, Colorado, USA
| | | | | | | | | | | | | |
Collapse
|
17
|
Hiemeyer K, Lutz R, Menninger H. Generalisiertes Auftreten von schmerzhaften Druckpunkten an Sehnen und Muskeln beim habituellen Rundrücken - ein Beitrag zur Diskussion um das Fibromyalgiesyndrom (FMS). AKTUEL RHEUMATOL 2008. [DOI: 10.1055/s-2008-1047495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
18
|
Park J, Lutz R, Felszeghy E, Wiltfang J, Nkenke E, Neukam FW, Schlegel KA. The effect on bone regeneration of a liposomal vector to deliver BMP-2 gene to bone grafts in peri-implant bone defects. Biomaterials 2007; 28:2772-82. [PMID: 17339051 DOI: 10.1016/j.biomaterials.2007.02.009] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [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: 12/18/2006] [Accepted: 02/08/2007] [Indexed: 11/26/2022]
Abstract
Successful bone-implant osseointegration in large peri-implant bone defects is often difficult, even through autologous bone grafting. Recently, cell-mediated regional gene therapy was introduced to deliver potent morphogens or growth factors in regenerative medicine. We applied liposomal vectors carrying bone morphogenetic protein (BMP)-2 cDNA directly into freshly created peri-implant bone defects on pig calvariae, with or without autologous bone graft. The BMP-2 gene was efficiently introduced into immigrating cells and trabecular cells lining the marginal bone surrounding the bony defect. After 1 week, abundant BMP-2 protein was detected throughout the peri-implant bone defect by immunohistochemistry. At 4 weeks, BMP-producing cells were still present in the defect and peri-implant area, which significantly enhanced new bone formation, compared with the control groups. Interestingly within a week of BMP-2 gene delivery with bone grafts, most osteoblastic cells lining the grafted bone chips also produced BMP-2. Particulated bone was immediately reorganized into newly formed trabecular bone. Grafted bone without BMP-2 gene delivery was still scattered and new bone matrix formation was not detected until 4 weeks after bone grafting. In conclusion, direct application of the BMP-2 gene using a liposomal vector enhanced bone regeneration in a bony defect and gene delivery combined with bone graft could induce a rapid osseointegration of the bone-implant interface at earlier stage.
Collapse
Affiliation(s)
- J Park
- Department of Oral and Maxillofacial Surgery, University of Erlangen-Nuremberg, Glueckstrasse 11, Erlangen, Germany.
| | | | | | | | | | | | | |
Collapse
|
19
|
Kovtun Y, Erickson H, Kellogg B, Steeves R, Widdison W, Garrett L, Chari R, Lutz R, Blättle W, Goldmacher V. 216 POSTER The cytotoixicity of antibody-drug conjugates to bystander cells. EJC Suppl 2006. [DOI: 10.1016/s1359-6349(06)70221-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: 11/25/2022] Open
|
20
|
Lutz R. [The therapeutic concept of euthymic treatment. The little school of pleasure]. MMW Fortschr Med 2005; 147:41-3. [PMID: 16193876] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
With the aid of euthymic treatment, patients can learn to open up to, and enjoy, positive occurrences, to create their own space for well-being, and to develop a higher level of self-care. Changes in both the cognitive and the sensual planes in particular, are goals to be aimed at. The concept of euthymic therapy has developed on the basis of research on enjoyment and a therapeutic program known as the "little school of pleasure." Today, this program is being applied in a variety of different categories of patients, for example, depressives, alcoholics, schizophrenics, neurological, traumatized and chronic-pain patients, as well as those hospitalized in psychosomatic and psychiatric institutions.
Collapse
Affiliation(s)
- R Lutz
- Fachbereich Psychologie der Pholipps Universität Marburg.
| |
Collapse
|
21
|
Köhnlein OC, Beckers M, Schwander S, Lutz R, Schmauss M, Messer T. Therapeutic drug monitoring of quetiapine regarding plasma level concentration and dependence from daily dosage. Pharmacopsychiatry 2005. [DOI: 10.1055/s-2005-918748] [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: 10/18/2022]
|
22
|
Beckers M, Köhnlein OC, Lutz R, Schmauss M, Messer T. Investigation of plasma level concentrations of mirtazapine regarding compliance and comedication. Pharmacopsychiatry 2005. [DOI: 10.1055/s-2005-918632] [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: 10/18/2022]
|
23
|
Lutz R, Aserin A, Garti N. Maillard Reaction between Leucine and Glucose in O/W Microemulsion Media in Comparison to Aqueous Solution. J DISPER SCI TECHNOL 2005. [DOI: 10.1081/dis-200057627] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
24
|
Lutz R, Köhnlein O, Minov C, Vogel M, Eichinger M, Messer T, Schmauß M. Management of the atypical antipsychotic olanzapine (Zyprexa) in a clinical environment with particular regard to therapeutic drug monitoring (TDM) in a German state hospital. Pharmacopsychiatry 2004. [DOI: 10.1055/s-2003-825431] [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: 10/25/2022]
|
25
|
Vogel M, Messer T, Köhnlein O, Lutz R, Minov C, Schmauß M. Investigative drug monitoring of antipsychotics and antidepressants during acute admission in a psychiatric state hospital in Germany. Pharmacopsychiatry 2004. [DOI: 10.1055/s-2003-825545] [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: 10/25/2022]
|
26
|
|
27
|
Jung EM, Clevert DA, Lutz R, Kett H, Rupp N. [Preoperative wire localisation of breast lesions by tissue harmonic imaging (THI) sonography]. ROFO-FORTSCHR RONTG 2002; 174:1121-5. [PMID: 12221570 DOI: 10.1055/s-2002-33932] [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] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
PURPOSE To obtain a fast and reliable preoperative wire localisation of occult lesions in dense breast tissue by tissue harmonic imaging (THI) sonography when localisation by mammography is not reliable enough. MATERIAL AND METHODS In addition to biplane mammography for breast screening or for follow-up examination after breast-saving therapy, ultrasound was performed by two independent radiologists in 350 patients with mastopathic or fibrotic breast tissue. Using a multifrequency probe (5 - 10 MHz), lesions were documented by conventional B-mode and by THI in similar projections. In 25 lesions not precisely identified in mammography sonographically guided puncture with wire localisation was performed. RESULTS In 22 of 350 patients 25 circumscribed suspicious lesions with an average diameter of 8 mm were identified, regarded suspicious by ultrasound but not by mammography. Nineteen of 25 lesions found by M-Mode and THI, an additional 6 only by THI. Guided puncture and wire localisation was achieved in 10 minutes on the average. In B-mode, the course of needle and wire was reliably seen in 16 of 25 cases, in THI in all cases. After surgical removal of tissue, histopathology revealed a ductal or lobular carcinoma in 19 cases, metastasis in three cases and benign complicated cysts with fibrotic tissue in the remaining three cases. CONCLUSION THI is superior to B-mode ultrasound in differentiating suspicious lesions in dense glandular breast tissue. If tumor signs in mammography are not reliable enough or if a precise localisation is not possible, sonographically guided puncture by THI can give reliable results and, furthermore, is faster and more comfortable for the patient than localisation by mammography.
Collapse
MESH Headings
- Biopsy, Needle/instrumentation
- Breast/pathology
- Breast Neoplasms/diagnostic imaging
- Breast Neoplasms/pathology
- Breast Neoplasms/secondary
- Breast Neoplasms/surgery
- Carcinoma, Ductal, Breast/diagnostic imaging
- Carcinoma, Ductal, Breast/pathology
- Carcinoma, Ductal, Breast/surgery
- Carcinoma, Lobular/diagnostic imaging
- Carcinoma, Lobular/pathology
- Carcinoma, Lobular/surgery
- Diagnosis, Differential
- Female
- Fibrocystic Breast Disease/diagnostic imaging
- Fibrocystic Breast Disease/pathology
- Fibrocystic Breast Disease/secondary
- Humans
- Punctures/instrumentation
- Sensitivity and Specificity
- Ultrasonography, Mammary/instrumentation
Collapse
Affiliation(s)
- E M Jung
- Röntgeninstitut des Klinikums Passau.
| | | | | | | | | |
Collapse
|
28
|
Jung EM, Kubale R, Clevert DA, Lutz R, Rupp N. [B-flow and contrast medium-enhanced power Doppler (Optison(R))--preoperative diagnosis of high-grade stenosis of the internal carotid artery]. ROFO-FORTSCHR RONTG 2002; 174:62-9. [PMID: 11793287 DOI: 10.1055/s-2002-19548] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
PURPOSE To improve sonographic diagnosis of high-grade stenosis of the internal carotid artery (ICA) by vascular sonography in "B-flow"-mode and in contrast medium (Optison(R))-enhanced power Doppler (PD). MATERIAL AND METHODS 88 patients suspected of a high-grade stenosis of the extracranial ICA were examined by independent examiners with color-coded Doppler (CCD), B-flow and PD to compare the methods for morphology and degree of stenosis. In 21 cases contrast medium was used in PD. Sonographic results of all 88 patients were compared with selective angiography (DSA), in 53 cases with operative findings. RESULTS A complete occlusion was found in 9 patients and a 50 - 70 % degree non-exulcerated stenosis in 26 cases. 53 of 88 patients presented findings in both sonography and DSA leading to operation of the ICA. Among these 47 had a stenosis > 70 % and 6 a stenosis of 60 - 70 % with exulcerated plaques. Even a small dose of contrast medium (0.3 ml) gave a significant signal increase in PD improving flow detection even in extensive vascular calcification. In both the early phase (up to the first minute p. i.) flow contrast was optimal and without significant artifacts. Thus, the extent and the morphology of the stenosis was better appreciated. Hypoechogenic plaques, ulcerations and thrombi are as easily recognized by B-flow as flow in preocclusive stenosis, free of vibration and blooming artifacts. This gave a better correlation with DSA and a higher diagnostic accuracy in grading a stenosis than CCD and PD. Circular calcifications or vessel kinking made diagnosis of flow more difficult. CONCLUSION B-flow allows a reliable diagnosis of the degree of stenosis of ICA and a better appreciation of plaque morphology than CCD. In some cases with extensive calcifications contrast medium-enhanced PD is able to detect better intrastenotic flow. Only small quantities of contrast medium (Optison(R)) are required.
Collapse
Affiliation(s)
- E M Jung
- Institut für Röntgendiagnostik, Klinikum Passau, Germany.
| | | | | | | | | |
Collapse
|
29
|
Fitzsimmons D, Lutz R, Wheat W, Chamberlin HM, Hagman J. Highly conserved amino acids in Pax and Ets proteins are required for DNA binding and ternary complex assembly. Nucleic Acids Res 2001; 29:4154-65. [PMID: 11600704 PMCID: PMC60220 DOI: 10.1093/nar/29.20.4154] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Combinatorial association of DNA-binding proteins on composite binding sites enhances their nucleotide sequence specificity and functional synergy. As a paradigm for these interactions, Pax-5 (BSAP) assembles ternary complexes with Ets proteins on the B cell-specific mb-1 promoter through interactions between their respective DNA-binding domains. Pax-5 recruits Ets-1 to bind the promoter, but not the closely related Ets protein SAP1a. Here we show that, while several different mutations increase binding of SAP1a to an optimized Ets binding site, only conversion of Val68 to an acidic amino acid facilitates ternary complex assembly with Pax-5 on the mb-1 promoter. This suggests that enhanced DNA binding by SAP1a is not sufficient for recruitment by Pax-5, but instead involves protein-protein interactions mediated by the acidic side chain. Recruitment of Ets proteins by Pax-5 requires Gln22 within the N-terminal beta-hairpin motif of its paired domain. The beta-hairpin also participates in recognition of a subset of Pax-5-binding sites. Thus, Pax-5 incorporates protein-protein interaction and DNA recognition functions in a single motif. The Caenorhabditis elegans Pax protein EGL-38 also binds specifically to the mb-1 promoter and recruits murine Ets-1 or the C.elegans Ets protein T08H4.3, but not the related LIN-1 protein. Together, our results define specific amino acid requirements for Pax-Ets ternary complex assembly and show that the mechanism is conserved between evolutionarily related proteins of diverse animal species. Moreover, the data suggest that interactions between Pax and Ets proteins are an important mechanism that regulates fundamental biological processes in worms and humans.
Collapse
Affiliation(s)
- D Fitzsimmons
- Integrated Department of Immunology, University of Colorado Health Sciences Center, Denver, CO 80262, USA
| | | | | | | | | |
Collapse
|
30
|
Lutz R, Lozinski T, Ellinger T, Bujard H. Dissecting the functional program of Escherichia coli promoters: the combined mode of action of Lac repressor and AraC activator. Nucleic Acids Res 2001; 29:3873-81. [PMID: 11557820 PMCID: PMC55909 DOI: 10.1093/nar/29.18.3873] [Citation(s) in RCA: 72] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The mode of action of regulated promoters is largely determined by kinetic parameters which govern the interaction between promoters and proteins involved in induction and repression of transcription. To gain insight into the interplay between positively and negatively acting transcriptional regulators, in this case AraC and LacR, we have generated a panel of promoter sequences derived from P(lac), the promoter of the Escherichia coli lac operon. The function of these promoters is limited at different steps and to various extents within the pathway of RNA polymerase (RNAP)/promoter interaction. Moreover, in all promoters the cAMP receptor protein binding site was replaced by the binding motif of AraC to prevent pleiotropic effects in vivo upon activation. Analyzing the activation of these promoters by AraC in vivo under conditions of repression by LacR and derepression yielded a three step model of transcription initiation which reveals mechanisms of AraC and LacR action. Our data show three distinct rate limiting steps at which AraC can exert its function. In general, the activator accelerates the formation of the first stable complex between RNAP and promoter. At most promoter sequences, however, its main impact is on the conversion of the closed to the open complex. However, AraC is also capable of eliminating limitations at steps following open complex formation.
Collapse
Affiliation(s)
- R Lutz
- Zentrum für Molekulare Biologie der Universität Heidelberg, Im Neuenheimer Feld 282, D-69120 Heidelberg, Germany
| | | | | | | |
Collapse
|
31
|
Abstract
PURPOSE To evaluate the diagnostic accuracy of femoral artery pseudoaneurysm by B-flow, a new ultrasound method and the outcome of compression treatment. MATERIAL AND METHODS 700 patients with radiological interventions (300 DSA, 355 PTA, 45 thrombolysis) have been examined by vascular ultrasound for possible bleeding at the puncture site to rule out pseudoaneurysms. The new B-flow ultrasound with a multi-frequency probe was used besides color-coded Doppler (CCD) and power Doppler (PD). RESULTS No pseudoaneurysm was found in patients with diagnostic angiography and thrombolysis. In 25 of 355 patients a pseudoaneurysm was detected after PTA in 8 of them in the common and in 17 in the superficial femoral artery. The diameters were 1.5 to 4.5 cm, 3 cm on average. By ultrasound compression treatment of 20 minutes on the average 23 out of 25 pseudoaneurysms were occluded without any further complication. In B-flow the lesion of the vessel wall, the flow in the fistula and in the sack of the pseudoaneurysm were better demonstrated and without artifacts compared to both other methods. This makes treatment by compression much easier, first of all because remaining flow phenomena and the progression of intracavitary thrombosis can be controlled. CONCLUSION The newly developed B-flow detects both slow and fast flow phenomena. Visualisation of the fistula canal and the aneurysm sack is more reliable and examiner-independent than other Doppler methods such as CCD and PD. This allows better compression treatment of the fistula canal.
Collapse
Affiliation(s)
- E M Jung
- Institut für Röntgendiagnostik, Klinikum Passau
| | | | | | | |
Collapse
|
32
|
Abstract
PURPOSE To evaluate the efficacy of intra-arterial thrombolysis by rt-PA in acute and subacute extensive peripheral vascular occlusion. MATERIAL AND METHODS 100 patients with acute and subacute occlusion of peripheral arteries were treated by catheter thrombolysis using 20 mg of rt-PA over a period of 20-24 hours. In all cases the occlusion extended to more than 20 cm and two stages of the extremity were involved. In 80 patients the original vessels (69/80 by thrombosis, 11/80 by embolization) and in 20 cases the femoro-popliteal bypass vessel was occluded. A catheter was inserted into the thrombus into which rt-PA and heparin were separately infused by two injectors. Heparin was given in a dose of 800-1000 U/h depending on the continuously monitored PTT levels. A control angiography was performed after 10 mg of rt-PA. After successful thrombolysis either PTA or aspiration thrombectomy was performed, if necessary, to reestablish a nearly normal vascular lumen. Open arteries of the thigh and at least one main vessel of lower leg was considered as success. RESULTS Recanalization of the original vessels was successfully by thrombolysis, PTA or aspiration thrombectomy in 68/80 [85%] cases. Thrombolysis and PTA reestablished a normal lumen of the bypass vessel in 11/20 [65%] and in 6 more cases a recanalization with minor stenosis. In 13/15 patients with critical ischemia, thrombolysis probably helped to avoid amputation by reopening smaller collateral arteries. Bleeding at the puncture site, as a complication of thrombolysis, was the reason for stopping therapy in three cases. There was no retroperitoneal or cerebral bleeding. After successful thrombolysis, reocclusion occurred in 15 patients within one year, only in five cases amputation was necessary. CONCLUSION Extensive occlusion of peripheral arteries or of a femoro-cural bypass can be successfully treated by low dose rt-PA thrombolysis with a low complication rate. Even partial reopening may prevent amputation.
Collapse
Affiliation(s)
- E M Jung
- Institut für Röntgendiagnostik des Klinikums Passau
| | | | | |
Collapse
|
33
|
Lutz R. Screening for life: helping Delaware women receive lifesaving services. Del Med J 1999; 71:383-4. [PMID: 10584438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
|
34
|
Abstract
The highly conserved DnaK chaperones consist of an N-terminal ATPase domain, a central substrate-binding domain, and a C-terminal domain whose function is not known. Since Bacillus subtilis dnaK was not able to complement an Escherichia coli dnaK null mutant, we performed domain element swap experiments to identify the regions responsible for this finding. It turned out that the B. subtilis DnaK protein needed approximately normal amounts of the cochaperone DnaJ to be functional in E. coli. The ATPase domain and the substrate-binding domain form a species-specific functional unit, while the C-terminal domains, although less conserved, are exchangeable. Deletion of the C-terminal domain in E. coli DnaK affected neither complementation of growth at high temperatures nor propagation of phage lambda but abolished degradation of sigma32.
Collapse
Affiliation(s)
- A Mogk
- Institute of Genetics, University of Bayreuth, D-95440 Bayreuth, Germany
| | | | | | | |
Collapse
|
35
|
Abstract
Plasmids for the tetracycline regulated gene expression in Streptococcus pneumoniae have been developed. The plasmids were used for the tetracycline-dependent production of firefly luciferase in streptococci. The production of luciferase can be induced fivefold by the addition of tetracycline. By using two promoters of different strength and depending on the presence or absence of tetracycline, an 80-fold range of luciferase activities can be covered. The system was also used to construct strains that depend on the addition of tetracycline for the production of the A subunit of DNA gyrase, an essential streptococcal protein. The growth of such a strain depends on the addition of tetracycline to the medium. In the absence of tetracycline, the cells cease to grow and are not viable. The system presented in this report should be useful for the characterization of gene networks in S. pneumoniae. It especially allows one to study the function of essential genes that can not be investigated by standard knock-out techniques.
Collapse
Affiliation(s)
- M Stieger
- Pharmaceutical Research Preclinical Infectious Diseases, F. Hoffmann-La Roche Ltd., 4070, Basel, Switzerland.
| | | | | | | | | |
Collapse
|
36
|
Abstract
The aim of this study was to investigate the permeation behavior of a large molecule through a venous wall; hemoglobin was chosen as a model substance. In vitro experiments were performed using a Chien-Valia diffusion chamber. Postmortem, hemolyzed, and fresh nonhemolyzed blood samples were investigated as permeants. Vein patches from vena cava inferior and vena jugularis interna were used as diffusion barriers. Applying this technique, extravasation of hemoglobin was detectable. The portion of hemoglobin molecules passing through the vascular wall depended on time, vein type, and graduation of hemolysis. The passage of hemoglobin across the wall of a large vein suggests intravascular changes in drug concentrations from postmortem blood samples not to be restricted on the unbound portion of the particular drug.
Collapse
Affiliation(s)
- G Skopp
- Institute of Legal Medicine, Ruprecht-Karls-University, Heidelberg, Germany
| | | | | | | | | |
Collapse
|
37
|
Skopp G, Klinder K, Pötsch L, Zimmer G, Lutz R, Aderjan R, Mattern R. Postmortem distribution of dihydrocodeine and metabolites in a fatal case of dihydrocodeine intoxication. Forensic Sci Int 1998; 95:99-107. [PMID: 9722974 DOI: 10.1016/s0379-0738(98)00091-7] [Citation(s) in RCA: 22] [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] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A report of a fatal dihydrocodeine ingestion under substitution therapy is given. Quantitation of dihydrocodeine, dihydromorphine, N-nordihydrocodeine, dihydrocodeine-6-, dihydromorphine-6- and dihydromorphine-3-glucuronide was performed simultaneously after solid-phase extraction prior to HPLC analysis, and the analytes were detected using their native fluorescence. Postmortem concentrations of blood samples from different sampling sites as well as from liver, kidney and cerebrum are reported. A hair sample was investigated to prove long-term use of the substitute drug. Site-to-site differences of the analytes from blood samples were very small. The partition behavior of the opioid glucuronides depended on the hematocrit value of the particular blood sample. Most important findings seemed that dihydromorphine and dihydromorphine-6-glucuronide concentrations decisively contributed to the toxicity of dihydrocodeine. This case report outlines that in dihydrocodeine related deaths the concentrations of the pharmacologically active metabolites should additionally be determined for reliable interpretation.
Collapse
Affiliation(s)
- G Skopp
- Institute of Legal Medicine and Traffic Medicine, Ruprecht-Karls-University Heidelberg, Germany
| | | | | | | | | | | | | |
Collapse
|
38
|
Uhlmann EJ, Subramanian T, Vater CA, Lutz R, Chinnadurai G. A potent cell death activity associated with transient high level expression of BCL-2. J Biol Chem 1998; 273:17926-32. [PMID: 9651399 DOI: 10.1074/jbc.273.28.17926] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The BCL-2 proto-oncogene contains unusually long untranslated 5' and 3' sequences. Deletion of the sequences flanking the BCL-2 open reading frame dramatically increases the level of protein expression. Transient high level BCL-2 protein expression mediated by plasmid transfection or by infection with recombinant adenovirus results in potent apoptosis of several cell lines. Detailed mutational (deletion and add-back) analysis reveals that both 5'- and 3'-flanking sequences contribute to the negative modulation of protein expression from the BCL-2 open reading frame. It appears that these sequences exert the negative regulatory effect in an orientation-dependent manner. Analysis of BCL-2 RNA levels indicate that elevated levels of mRNA may be the primary cause of elevated levels of protein expression. Apoptosis induced by adenovirus vectors expressing elevated levels of BCL-2 can be readily inhibited by the caspase inhibitor z-VAD-fmk, suggesting that high levels of BCL-2 expression induce apoptosis via the caspase cascade. Mutational analysis of BCL-2 indicates that its pro-apoptotic activity is separable from its anti-apoptosis activity. Our results raise the possibility that oncogenic conversion of BCL-2 may require somatic mutations in the pro-apoptotic activity, in addition to other activating mutations that result in enhanced expression. Consistent with this hypothesis, a somatic mutation of BCL-2 observed in multiple human tumors results in reduced apoptosis activity.
Collapse
Affiliation(s)
- E J Uhlmann
- Institute for Molecular Virology, Saint Louis University Health Sciences Center, St. Louis, Missouri 63110, USA
| | | | | | | | | |
Collapse
|
39
|
Abstract
In a case of insulin suicide in a nondiabetic woman, insulin was detected in routinely formalin fixed and paraffin embedded subcutaneous injection marks, in spite of a post-morterm interval of 24 days. Around birefringent crystalline material, probably zinc phosphate, immunohistochemistry revealed granular insulin depots as well as an insulin staining along the lipocyte membranes. A cellular reaction of granulocytic character was present, with an uptake of insulin by inflammatory cells.
Collapse
Affiliation(s)
- R Lutz
- Institute of Forensic Medicine, University of Heidelberg, Germany
| | | | | | | |
Collapse
|
40
|
|
41
|
Skopp G, Lutz R, Pötsch L, Ganssmann B, Klinder K, Schmidt A, Aderjan R, Mattern R. An in vitro experiment for postmortem vascular permeation. The passage of morphine and morphine glucuronides across a vascular wall. J Forensic Sci 1997; 42:486-91. [PMID: 9144936] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A venous blood sample taken at autopsy cannot be considered to represent the antemortem blood concentration of a particular substance. Autolytic processes cause disintegration and increasing permeability of the physiological and anatomical barriers such as vascular walls and lead to changes in substance concentrations. In the present study, the experimental design represents an in vitro postmortem simulation of a drug substance crossing a venous wall. The postmortem behavior of morphine, morphine-3- and morphine-6-glucuronide was investigated. A Chien-Valia-diffusion chamber with a patch of inferior vena cava as diffusion barrier was used. For optimal simulation of postmortem events, vein sampling was restricted to selected autopsy cases. Parameters for the analysis of diffusion across the vascular tissue were dependence on time, temperature, and initial substance concentrations. The penetration behavior simulating venous efflux and influx of the substances was studied by different orientation of the venous wall in the experiments. Rhodamine B was used as a model substance to visualize the binding to the tissue and the passage across the venous wall. The permeation of morphine, morphine-3- and morphine-6-glucuronide across a vein tissue was found to be mainly dependent on the disintegration of the vascular wall and on the postmortem time period as well as on concentration gradients. From the data of this preliminary in vitro study, it can be concluded that a lag time for transvascular diffusion exists postmortem. However, it could be demonstrated, that adsorption to and penetration into the vascular tissue may alter intraluminal blood concentrations even at an early stage of the postmortem time period.
Collapse
Affiliation(s)
- G Skopp
- Institute of Forensic Medicine, Ruprecht-Karls-University, Heidelberg, Germany
| | | | | | | | | | | | | | | |
Collapse
|
42
|
Lutz R, Bujard H. Independent and tight regulation of transcriptional units in Escherichia coli via the LacR/O, the TetR/O and AraC/I1-I2 regulatory elements. Nucleic Acids Res 1997; 25:1203-10. [PMID: 9092630 PMCID: PMC146584 DOI: 10.1093/nar/25.6.1203] [Citation(s) in RCA: 1228] [Impact Index Per Article: 45.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Based on parameters governing promoter activity and using regulatory elements of the lac, ara and tet operon transcription control sequences were composed which permit the regulation in Escherichia coli of several gene activities independently and quantitatively. The novel promoter PLtetO-1 allows the regulation of gene expression over an up to 5000-fold range with anhydrotetracycline (aTc) whereas with IPTG and arabinose the activity of Plac/ara-1 may be controlled 1800-fold. Escherichia coli host strains which produce defined amounts of the regulatory proteins, Lac and Tet repressor as well as AraC from chromosomally located expression units provide highly reproducible in vivo conditions. Controlling the expression of the genes encoding luciferase, the low abundance E.coli protein DnaJ and restriction endonuclease Cfr9I not only demonstrates that high levels of expression can be achieved but also suggests that under conditions of optimal repression only around one mRNA every 3rd generation is produced. This potential of quantitative control will open up new approaches in the study of gene function in vivo, in particular with low abundance regulatory gene products. The system will also provide new opportunities for the controlled expression of heterologous genes.
Collapse
Affiliation(s)
- R Lutz
- ZMBH Zentrum für Molekulare Biologie der Universität Heidelberg, Im Neuenheimer Feld 282, D-69120 Heidelberg, Germany
| | | |
Collapse
|
43
|
Abstract
Empirical correlations for the onset of turbulence in pulsatile flow through a straight tube and a 45 degrees T-bifurcation are presented. We pumped three different test fluids of kinematic viscosity 0.008-0.035 cm2 s-1 through four straight tubes 0.4-3.0 cm in diameter and three 45 degree T-bifurcations 0.45-2.2 cm in diameter. A Scotch yoke mechanism provided an oscillatory sine wave flow component of known stroke volume and frequency. To determine transition to turbulence, we adjusted the mean flow independently until we detected signal instabilities from hot film or electrochemical wall shear stress probes. The critical peak Reynolds number was found to correlate with two independent dimensionless groups: the Womersley parameter and the Strouhal number. We derived power low functions of these groups to provide an accurate and convenient method of predicting transition in both straight and bifurcating tubes. When compared to pulsatile flow through the straight tube, the presence of flow separation within the 45 degrees T-bifurcation induced flow instabilities at lower values of the peak Reynolds number. The correlation for the 45 degrees T-bifurcation is also a suitable model for predicting transition at coronary branch points, which we previously studied in an in vitro pulse duplicator. Flow instabilities at coronary branch points may play an important role in atherogenesis.
Collapse
Affiliation(s)
- J Peacock
- National Institutes of Health, Bethesda, MD 20892-5766, USA
| | | | | | | |
Collapse
|
44
|
Abstract
A two-part study was conducted to determine the sources of variation in nasalance scores derived from the Nasometer. In Study #1, a function generator was used as a signal source to calibrate and input sine and square waves directly into the Nasometer. Ten stimuli ranging from 105 to 330 Hz in 25 Hz increments were evaluated. In Study #2, the same signal source and an amplified loudspeaker were used to calibrate and present square waves to the nasometer via five different sets of microphones. The sound pressure level of all stimuli was maintained at 88 dB. Each microphone set was calibrated using the 105 Hz signals. Results from Study #1 indicated consistent nasalance scores across all frequencies (i.e., all scores were within 2% of calibration). Results from Study #2 demonstrated deviations greater than 2% from calibration as a function of frequency for all five sets of microphones. The smallest deviation was 5%, whereas the largest deviation was 14%. We suggest that the variation in nasalance as a function of stimulus frequency may be due to a mismatch in the sensitivity of microphones (i.e., different frequency response characteristics). It is further suggested (a) that individual investigators determine the response characteristics of their microphones and (b) that relatively small variations in nasalance scores (i.e., 5-14%) either within or across speakers be interpreted with caution.
Collapse
Affiliation(s)
- D J Zajac
- Department of Dental Ecology, University of North Carolina at Chapel Hill, USA.
| | | | | |
Collapse
|
45
|
Skopp G, Lutz R, Ganssmann B, Mattern R, Aderjan R. Postmortem distribution pattern of morphine and morphine glucuronides in heroin overdose. Int J Legal Med 1996; 109:118-24. [PMID: 8956984 DOI: 10.1007/bf01369670] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The postmortem distribution of morphine and its metabolites was investigated in four cases of heroin overdose to evaluate some of the factors that influence intravasal blood concentrations. Variables included were the chemical stability of morphine conjugates, hemoconcentration, incomplete distribution of the drug and diffusion processes. Blood samples from different sampling sites including the aorta, the infra- and suprarenal portion of the inferior vena cava, the superior vena cava, the femoral and subclavian veins, and the right and left ventricles were examined for morphine, morphine-3-glucuronide and morphine-6-glucuronide, hematocrit and water content. Drug concentrations were determined by HPLC based on the native fluorescence of the analytes. Morphine glucuronides proved to be stable for a time period of 72 h. The water content ranged from 65 to 83% and hematocrit values from 25 to 75%, and were seen as contributory factors to the dramatic differences observed for drug concentrations from different sampling sites. The differences could neither be attributed to incomplete distribution during life-time nor to a diffusion process following the different distribution volumes of morphine and its conjugates. A definite relationship between the ratio of the molar concentrations of morphine and its glucuronides, as assessed in pharmacokinetical studies after morphine dosing, could not be established. For a better understanding more cases and changes over time and tissue concentrations should be analysed.
Collapse
Affiliation(s)
- G Skopp
- Institut für Rechtsmedizin, Ruprecht-Karls-Universität, Heidelberg, Germany
| | | | | | | | | |
Collapse
|
46
|
Bauer WR, Hiller KH, Roder F, Neubauer S, Fuchs A, Boes CG, Lutz R, Gaudron P, Hu K, Haase A. Investigation of coronary vessels in microscopic dimensions by two- and three-dimensional NMR microscopic imaging in the isolated rat heart. Visualization of vasoactive effects of endothelin 1. Circulation 1995; 92:968-77. [PMID: 7641381 DOI: 10.1161/01.cir.92.4.968] [Citation(s) in RCA: 13] [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: 01/26/2023]
Abstract
BACKGROUND Nuclear magnetic resonance (NMR) imaging of macroscopic coronary vessels is rapidly advancing, whereas little attention has focused on development of NMR techniques for investigation of coronary microvessels. Such techniques would be of particular importance, since conventional methods to visualize coronary microvessels have specific limitations. The aim of our study was to develop two- and three-dimensional (2D and 3D) high-resolution imaging of coronary microvessels. Quantitative analysis of vessel size was performed in tomograms and applied to evaluate the vasoconstrictor effect of endothelin 1. METHODS AND RESULTS Angiographic imaging was performed on an 11.75-T magnet by 2D and 3D gradient-echo pulse sequences. In tomograms, the validity of this method in providing correct vessel size was tested by phantom experiments. Experiments were carried out in the isolated constant-pressure-perfused rat heart with continuous registration of coronary flow and left ventricular pressure. NMR pulse sequences were pressure-triggered in mid diastole. Four groups of hearts were studied. In group 1 (n = 20), 2D imaging perpendicular and parallel to the long axis of the heart was performed. Cross sections of vessels with diameter > 140 microns were clearly detectable. In group 2 (control, n = 5) and group 3 (n = 13), tomograms perpendicular to the long axis were obtained before and after administration of vehicle (group 2) and 200 pmol endothelin 1 bolus (group 3). Vehicle had no effect on vessel cross section. Endothelin 1, which decreased global coronary flow by 47%, reduced vessel cross section by 38 +/- 19%. A weak but, on average, significant inverse correlation between area of cross section and vessel size was found. In group 4 (n = 10), 3D imaging was performed in 7 normal hearts and 3 hearts with anterior myocardial infarction. A 3D image of the entire coronary artery tree was obtained, revealing excellent agreement with anatomic studies. In infarcted rat hearts, occlusion of the left coronary artery was demonstrated. CONCLUSIONS Visualization and quantification of coronary microvessels are feasible by NMR microscopy. NMR microscopy bears the potential of becoming a powerful tool for the investigation of the coronary microcirculation.
Collapse
Affiliation(s)
- W R Bauer
- Medizinische Universitätsklinik Würzburg, Germany
| | | | | | | | | | | | | | | | | | | |
Collapse
|
47
|
Tint GS, Salen G, Batta AK, Shefer S, Irons M, Elias ER, Abuelo DN, Johnson VP, Lambert M, Lutz R. Correlation of severity and outcome with plasma sterol levels in variants of the Smith-Lemli-Opitz syndrome. J Pediatr 1995; 127:82-7. [PMID: 7608816 DOI: 10.1016/s0022-3476(95)70261-x] [Citation(s) in RCA: 123] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
OBJECTIVES To determine whether type I and the more severe type II variant of Smith-Lemli-Opitz syndrome have the same metabolic defect and to learn which plasma sterol measurements best predict survival. METHODS Plasma sterols were measured in 33 individuals (24 type I, 9 type II) with a clinical diagnosis of the syndrome. RESULTS Cholesterol levels were abnormally low (61 +/- 34 mg/dl) in type I subjects, whereas concentrations of the cholesterol precursor 7-dehydrocholesterol and its isomer 8-dehydrocholesterol were elevated 40- to 10,000-fold. Plasma cholesterol levels were significantly lower and total dehydrocholesterol levels higher in type II than in type I. Six children with the type II variant died by 13 weeks with mean plasma cholesterol levels 6.2 +/- 3.1 mg/dl, versus 17 +/- 11 mg/dl in the three surviving children with type II (p < 0.05). No child with a cholesterol level 7 mg/dl or less lived longer than 13 weeks. CONCLUSIONS Patients with type I and type II variants of Smith-Lemli-Opitz syndrome have markedly reduced activity of the enzyme that converts 7-dehydrocholesterol to cholesterol, but the extent of the block is far more complete in type II. Survival correlates strongly with higher plasma cholesterol concentrations.
Collapse
Affiliation(s)
- G S Tint
- Research Service, Department of Veterans Affairs Medical Center, East Orange, NJ 07018, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
48
|
Fisk JR, Peterson HA, Laughlin R, Lutz R. Spontaneous fusion in scoliosis after instrumentation without arthrodesis. J Pediatr Orthop 1995; 15:182-6. [PMID: 7745090] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The technique of subcutaneous rod insertion without exposure of the curve has been proposed as a method of controlling the progression of scoliosis while allowing the spine to grow. We review the literature and present three patients whose spines spontaneously fused unexpectedly while undergoing this form of treatment. The fusion occurred posteriorly, and continued anterior growth led to increased deformity from the crankshaft phenomenon. Based on this experience, the authors recommend careful follow-up and early anterior fusion when the crankshaft phenomenon is observed.
Collapse
Affiliation(s)
- J R Fisk
- Division of Orthopaedic Surgery and Rehabilitation, Southern Illinois University School of Medicine, Springfield 62794-9230, USA
| | | | | | | |
Collapse
|
49
|
Bueno JD, Lutz R, Cho S. Ornithine transcarbamylase deficiency: case report and review. Kans Med 1995; 96:135-138. [PMID: 8583741] [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] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Affiliation(s)
- J D Bueno
- Dept. of Pediatrics, UKSM-Wichita, USA
| | | | | |
Collapse
|
50
|
Abstract
An in vitro pulse duplicator system was used to investigate whether coronary artery stents induce downstream flow instabilities. Hot film or electrochemical probes were used to measure wall shear stress before and after deployment of both single and multiple (overlapping) stents in normal and diseased coronary geometries. Left main coronary diameters ranged from 4 to 5 mm, whereas left anterior descending (LAD) and left circumflex (LCX) diameters ranged from 2 to 4 mm. Under resting conditions, all coronary flow waveforms remained laminar, even after stent placement. However, disturbances were found downstream from a stent placed in the proximal LAD under mild exercise conditions. These disturbances were found 5 mm distal to the stent, in both the LAD and the proximal LCX. Turbulence intensities of order 5% were induced by a single slotted stent in a normal LAD geometry. In cases of distal disease, the turbulence intensity was 9% with one stent and 11% with tandem stents. In cases of proximal disease, these values were 19 and 25%, respectively. The shear stress from these disturbances (20-200 dynes cm-2) is sufficient to delay re-endothelialization and promote restenosis. Therefore, the disturbances could contribute to the increased incidence of restenosis reported with multiple stents, and with stents used in cases of diffuse coronary disease.
Collapse
Affiliation(s)
- J Peacock
- National Institutes of Health, Bethesda, MD 20892-5766
| | | | | | | |
Collapse
|