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Amatu JB, Baudouin C, Trinh L, Labbé A, Buffault J. [Corneal epithelial biomechanics: Resistance to stress and role in healing and remodeling]. J Fr Ophtalmol 2023; 46:287-299. [PMID: 36759249 DOI: 10.1016/j.jfo.2022.09.026] [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: 09/04/2022] [Revised: 09/29/2022] [Accepted: 09/29/2022] [Indexed: 02/10/2023]
Abstract
The corneal epithelium is one of the first tissue barriers of the eye against the environment. In recent years, many studies provided better knowledge of its healing, its behavior and its essential role in the optical system of the eye. At the crossroads of basic science and clinical medicine, the study of the mechanical stresses applied to the cornea makes it possible to learn the behavior of epithelial cells and better understand ocular surface disease. We describe herein the current knowledge about the adhesion systems of the corneal epithelium and their resistance to mechanical stress. We will also describe the involvement of these mechanisms in corneal healing and their role in epithelial dynamics. Adhesion molecules of the epithelial cells, especially hemidesmosomes, allow the tissue cohesion required to maintain the integrity of the corneal epithelium against the shearing forces of the eyelids as well as external forces. Their regeneration after a corneal injury is mandatory for the restoration of a healthy epithelium. Mechanotransduction plays a significant role in regulating epithelial cell behavior, and the study of the epithelium's response to mechanical forces helps to better understand the evolution of epithelial profiles after refractive surgery. A better understanding of corneal epithelial biomechanics could also help improve future therapies, particularly in the field of tissue engineering.
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Affiliation(s)
- J-B Amatu
- Department of Ophthalmology III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France.
| | - C Baudouin
- Department of Ophthalmology III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France; Institut de La Vision, Sorbonne Université, Inserm, CNRS, IHU FOReSIGHT, 17, rue Moreau, 75012 Paris, France; Department of Ophthalmology, Ambroise Paré Hospital, AP-HP, University of Versailles Saint-Quentin-en-Yvelines, Boulogne-Billancourt, France
| | - L Trinh
- Department of Ophthalmology III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France
| | - A Labbé
- Department of Ophthalmology III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France; Institut de La Vision, Sorbonne Université, Inserm, CNRS, IHU FOReSIGHT, 17, rue Moreau, 75012 Paris, France; Department of Ophthalmology, Ambroise Paré Hospital, AP-HP, University of Versailles Saint-Quentin-en-Yvelines, Boulogne-Billancourt, France
| | - J Buffault
- Department of Ophthalmology III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France; Institut de La Vision, Sorbonne Université, Inserm, CNRS, IHU FOReSIGHT, 17, rue Moreau, 75012 Paris, France; Department of Ophthalmology, Ambroise Paré Hospital, AP-HP, University of Versailles Saint-Quentin-en-Yvelines, Boulogne-Billancourt, France
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Trinh L, Pearston A, Fernandes S, Kiley P, Floroff C, Ingemi A. Effect of Hydroxocobalamin Compared to Methylene Blue for Management of Vasoplegia. J Heart Lung Transplant 2022. [DOI: 10.1016/j.healun.2022.01.305] [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: 10/18/2022] Open
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Chen X, Chiu C, Cheung HT, White ME, Chen X, Trinh L, Arthur AE. Breast Cancer Survivors’ Preferences and Barriers Related to ICT-Based Diet and Physical Activity Interventions. Curr Dev Nutr 2021. [DOI: 10.1093/cdn/nzab051_011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Objectives
To establish the preferences and perceived barriers related to physical activity and diet programming of breast cancer survivors (BCS) to inform the development of Information and Communication Technology (ICT)-based lifestyle interventions.
Methods
This was a cross-sectional study of 197 BSC aged 18 years or older and diagnosed with ductal carcinoma in situ (DCIS) or Stage I-IV breast cancer. The BCS were recruited during routine oncology appointments at a Midwestern cancer center. A survey was conducted to query survivors’ level of interest in, preferences for, and perceived barriers to participating in an exercise and dietary intervention program, with a specific emphasis on ICT-based programming.
Results
Overall, 85% of BCS reported they would consider participating in exercise and diet intervention research. Approximately 45% of participants reported that they had received diet and/or exercise information as part of their cancer care. However, only 15% of the participants received such information from healthcare professionals with the appropriate expertise (e.g., Dietitian, Exercise Specialist). Over two-thirds of the participants reported frequent use of mobile devices and the internet, and 80% indicated comfort using these devices (e.g., tablet, smart phone). The top three preferred formats for an ICT-based diet and exercise intervention program were “website”, “mobile apps” and “e-mails”. Older participants (>60 years) were more likely to report a preference for e-mails while younger participants (<60 years) were more likely to report a preference for websites or mobile apps. The most common perceived barriers to participation in a lifestyle intervention included fatigue, family responsibility and work.
Conclusions
Most BCS in this study were interested in exercise and diet interventions and would be comfortable with an ICT-based format with a preference for delivery via websites, mobile apps or e-mails. Future ICT-based lifestyle interventions should be designed with consideration of BCS’ age, barriers, facilitators and other characteristics.
Funding Sources
USDA-NIFA Hatch Project 1,011,487
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Affiliation(s)
- X Chen
- University of Illinois at Urbana-Champaign
| | - C Chiu
- University of Illinois at Urbana-Champaign
| | - HT Cheung
- Brigham and Women's Hospital, Harvard Medical School
| | | | - X Chen
- University of Illinois at Urbana-Champaign
| | | | - AE Arthur
- University of Illinois at Urbana-Champaign
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David C, Kallel S, Trinh L, Goemaere I, Borderie V, Bouheraoua N. [Intracorneal ring segments in keratoconus management]. J Fr Ophtalmol 2021; 44:882-898. [PMID: 33895029 DOI: 10.1016/j.jfo.2020.10.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Revised: 09/30/2020] [Accepted: 10/02/2020] [Indexed: 11/25/2022]
Abstract
Intracorneal ring segments (ICRS), used in the management of keratoconus since the 2000s, have enjoyed significant technological development. Various types of ICRS exist, whose arc length, thickness, and diameter can be chosen according to the desired effect on the spherical equivalent, keratometry and asphericity. Individualized implantation strategies, based on each patient's topographic and tomographic pattern, are constantly evolving. The surgical procedure is standardized, and complications remain very rare. Combined procedures (corneal collagen cross-linking and refractive photokeratectomy±topo-guided, phakic and pseudophakic intraocular lenses) are increasingly used and require a good knowledge of the effect of ICRS alone on the keratoconic cornea. The objective of this review is to summarize clinical practices used in the visual rehabilitation of keratoconic patients using the ICRS+- combined procedures.
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Affiliation(s)
- C David
- INSERM-DGOS CIC 1423, CHNO des Quinze-Vingts, IHU ForeSight, 28, rue de Charenton, 75012 Paris, France
| | - S Kallel
- INSERM-DGOS CIC 1423, CHNO des Quinze-Vingts, IHU ForeSight, 28, rue de Charenton, 75012 Paris, France
| | - L Trinh
- INSERM-DGOS CIC 1423, CHNO des Quinze-Vingts, IHU ForeSight, 28, rue de Charenton, 75012 Paris, France
| | - I Goemaere
- INSERM-DGOS CIC 1423, CHNO des Quinze-Vingts, IHU ForeSight, 28, rue de Charenton, 75012 Paris, France
| | - V Borderie
- INSERM-DGOS CIC 1423, CHNO des Quinze-Vingts, IHU ForeSight, 28, rue de Charenton, 75012 Paris, France; Inserm, CNRS, Sorbonne université, institut de la Vision, 17, rue Moreau, 75012 Paris, France
| | - N Bouheraoua
- INSERM-DGOS CIC 1423, CHNO des Quinze-Vingts, IHU ForeSight, 28, rue de Charenton, 75012 Paris, France; Inserm, CNRS, Sorbonne université, institut de la Vision, 17, rue Moreau, 75012 Paris, France.
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Bourdon H, Herbaut A, Trinh L, Tuil E, Girmens JF, Baudouin C. An algorithm in ophthalmic emergencies to evaluate the necessity of physical consultation during COVID-19 lockdown in Paris: Experience of the first 100 patients. J Fr Ophtalmol 2021; 44:307-312. [PMID: 33612327 PMCID: PMC7874947 DOI: 10.1016/j.jfo.2020.12.002] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Accepted: 12/10/2020] [Indexed: 11/25/2022]
Abstract
Purpose This study aimed to evaluate the ability of a freely accessible internet algorithm to correctly identify the need for emergency ophthalmologic consultation for correct diagnosis and management. Method This retrospective observational cohort study was based on the first 100 patients who requested recommendations on the necessity of breaking the lockdown for emergency ophthalmology consultation during the period from March to May 2020. Results Ninety-one patients completed questionnaires. Forty-nine were directed to emergency consultation and 42 to differed scheduled visits or telemedicine visits. One patient sent for emergency consultation had an overestimated severity and could have been seen later, while two patients initially recommended for a scheduled visit were considered appropriate for emergency consultation. However, these patients’ management did not suffer as a consequence of the delay. The sensitivity of the algorithm, defined as the number of emergency consultations suggested by the algorithm divided by the total number of emergency consultations deemed appropriate by the practitioner's final evaluation, was 96.0%. The specificity of the algorithm, defined as the number of patients recommended for delayed consultation by the algorithm divided by the number of patients deemed clinically appropriate for this approach, was 97.5%. The positive predictive value, defined as the number of appropriate emergency consultations divided by the total number of emergency consultations suggested by the algorithm, was 97.9%. Finally, the negative predictive value, defined as the number of appropriately deferred patients divided by the number of deferred patients recommended by the algorithm, was 95.2%. Conclusion This study demonstrates the reliability of an algorithm based on patients’ past medical history and symptoms to classify patients and direct them to either emergency consultation or to a more appropriate deferred, scheduled appointment. This algorithm might allow reduction of walk-in visits by half and thus help control patient flow into ophthalmologic emergency departments.
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Affiliation(s)
- H Bourdon
- Department of Ophthalmology III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France.
| | - A Herbaut
- Department of Ophthalmology III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France
| | - L Trinh
- Department of Ophthalmology III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France
| | - E Tuil
- Department of Ophthalmology IV, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France
| | - J F Girmens
- Department of Ophthalmology IV, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France
| | - C Baudouin
- Department of Ophthalmology III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France
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Trinh L, Bouheraoua N, Roman S, Auclin F, Labbé A, Baudouin C. Excimer laser programming of refractive astigmatism vs. anterior corneal astigmatism in the case of ocular residual astigmatism (ORA). J Fr Ophtalmol 2020; 44:189-195. [PMID: 33358474 DOI: 10.1016/j.jfo.2020.04.059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 04/21/2020] [Accepted: 04/22/2020] [Indexed: 11/18/2022]
Abstract
PURPOSE To determine whether manifest refractive astigmatism (RA) or anterior corneal astigmatism (CA) is the best value for excimer laser programming in cases of ocular residual astigmatism (ORA). PATIENTS AND METHODS Patients who had undergone LASIK surgery with a disagreement between manifest refractive and corneal cylinder (ocular residual astigmatism ORA)>0.75 D were included retrospectively in this study. We calculated target induced astigmatism vector (TIA), surgically induced astigmatism vector (SIA), difference vector between the astigmatism correction programmed in the excimer laser and refractive astigmatism (DVRA), difference vector between the astigmatism correction programmed in the excimer laser and corneal astigmatism (DVCA) and difference vector between TIA and SIA (DV), by the Alpins method. Vectorial differences between DV and DVRA, and between DV and DVCA, were then calculated to determine whether RA or CA was closest to the ideal cylinder for laser programming. RESULTS Of a total of 104 eyes undergoing LASIK, 22 eyes of 12 patients (21.1%) had an ORA>0.75 D and were included. Mean ORA was 0.9±0.2 D and mean postoperative subjective cylinder was 0.45 D. The DV-DVRA difference vector was 0.57±0.2 D, and the DV-DVCA difference vector was 0.86±0.4 D (P=0.02). RA was closer than CA to the ideal astigmatism correction. CONCLUSION In cases of discrepancy between manifest astigmatism and corneal astigmatism, correction of manifest refractive astigmatism seems to give a better refractive result.
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Affiliation(s)
- L Trinh
- CHNO des Quinze-Vingts, IHU Foresight, Inserm-DGOS CIC 1423, 28, rue de Charenton, 75012 Paris, France.
| | - N Bouheraoua
- CHNO des Quinze-Vingts, IHU Foresight, Inserm-DGOS CIC 1423, 28, rue de Charenton, 75012 Paris, France; Sorbonne Université, Inserm, CNRS, Institut de la Vision, 17, rue Moreau, 75012 Paris, France
| | - S Roman
- CHNO des Quinze-Vingts, IHU Foresight, Inserm-DGOS CIC 1423, 28, rue de Charenton, 75012 Paris, France
| | - F Auclin
- CHNO des Quinze-Vingts, IHU Foresight, Inserm-DGOS CIC 1423, 28, rue de Charenton, 75012 Paris, France
| | - A Labbé
- CHNO des Quinze-Vingts, IHU Foresight, Inserm-DGOS CIC 1423, 28, rue de Charenton, 75012 Paris, France; Sorbonne Université, Inserm, CNRS, Institut de la Vision, 17, rue Moreau, 75012 Paris, France; Department of Ophthalmology, Ambroise Paré Hospital, AP-HP, University of Versailles Saint-Quentin-en-Yvelines, Boulogne-Billancourt, France
| | - C Baudouin
- CHNO des Quinze-Vingts, IHU Foresight, Inserm-DGOS CIC 1423, 28, rue de Charenton, 75012 Paris, France; Sorbonne Université, Inserm, CNRS, Institut de la Vision, 17, rue Moreau, 75012 Paris, France; Department of Ophthalmology, Ambroise Paré Hospital, AP-HP, University of Versailles Saint-Quentin-en-Yvelines, Boulogne-Billancourt, France
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7
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Bourdon H, Jaillant R, Baudouin C, Trinh L. Delayed interface fluid syndrome following vitrectomy. J Fr Ophtalmol 2020; 44:e163-e164. [PMID: 33334626 DOI: 10.1016/j.jfo.2020.05.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 05/28/2020] [Indexed: 11/29/2022]
Affiliation(s)
- H Bourdon
- Service d'ophtalmologie III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France.
| | - R Jaillant
- Centre ophtalmologique Paris 17-SOS Œil, 33-35, rue de Chazelles, 75017 Paris, France
| | - C Baudouin
- Service d'ophtalmologie III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France; Sorbonne université, Inserm, CNRS, Institut de la Vision, 17, rue Moreau, 75012 Paris, France; Service d'ophtalmologie, hôpital Ambroise-Paré, AP-HP, université de Versailles Saint-Quentin-en-Yvelines, 9, avenue Charles-de-Gaulle, 92100 Boulogne-Billancourt, France
| | - L Trinh
- Service d'ophtalmologie III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France
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8
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Saad S, Saad R, Jouve L, Kallel S, Trinh L, Goemaere I, Borderie V, Bouheraoua N. Corneal crosslinking in keratoconus management. J Fr Ophtalmol 2020; 43:1078-1095. [DOI: 10.1016/j.jfo.2020.07.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 07/09/2020] [Accepted: 07/30/2020] [Indexed: 01/04/2023]
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Affiliation(s)
- L Trinh
- Centre hospitalier national d'ophtalmologie des Quinze-Vingts, IHU de Foresight, Inserm-DGOS CIC 1423, 28, rue de Charenton, 75012 Paris, France.
| | - C Baudouin
- Centre hospitalier national d'ophtalmologie des Quinze-Vingts, IHU de Foresight, Inserm-DGOS CIC 1423, 28, rue de Charenton, 75012 Paris, France; Service d'ophtalmologie, hôpital Ambroise-Paré, AP-HP, université de Versailles Saint-Quentin-en-Yvelines, 9, avenue Charles-de-Gaulle, 92100 Boulogne-Billancourt, France
| | - N Bouheraoua
- Centre hospitalier national d'ophtalmologie des Quinze-Vingts, IHU de Foresight, Inserm-DGOS CIC 1423, 28, rue de Charenton, 75012 Paris, France; Inserm, Sorbonne université, CNRS, institut de la Vision, 17, rue Moreau, 75012 Paris, France
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Chiche A, Trinh L, Baudouin C, Denoyer A. [SMILE (Small Incision Lenticule Extraction) among the corneal refractive surgeries in 2018 (French translation of the article)]. J Fr Ophtalmol 2018; 41:650-658. [PMID: 30170707 DOI: 10.1016/j.jfo.2018.03.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 03/05/2018] [Accepted: 03/13/2018] [Indexed: 11/24/2022]
Abstract
Refractive surgery is a field in constant evolution. In recent years, a new procedure has appeared under the name SMILE (Small Incision Lenticule Extraction). This technique, carried out solely with a femtosecond laser, should make it possible to better preserve corneal innervation and biomechanics. After a detailed review of the technique itself, we then focus on the scientific evidence for the safety and efficacy of SMILE and its current indications. Advantages of SMILE will be discussed in comparison to disadvantages of the conventional techniques, particularly concerning dry eye and the risk of corneal ectasia with LASIK. Lastly, the current limitations of SMILE (indications, retreatment) are discussed, and future applications are considered regarding improvements in the technique.
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Affiliation(s)
- A Chiche
- Service d'ophtalmologie 3, centre hospitalier national d'ophtalmologie des Quinze-Vingts, université de Versailles-Saint-Quentin-en-Yvelines, 28, rue de Charenton, 75012 Paris, France
| | - L Trinh
- Service d'ophtalmologie 3, centre hospitalier national d'ophtalmologie des Quinze-Vingts, université de Versailles-Saint-Quentin-en-Yvelines, 28, rue de Charenton, 75012 Paris, France; Espace Nouvelle Vision, 6, rue de la Grande Chaumière, 75006 Paris, France
| | - C Baudouin
- Service d'ophtalmologie 3, centre hospitalier national d'ophtalmologie des Quinze-Vingts, université de Versailles-Saint-Quentin-en-Yvelines, 28, rue de Charenton, 75012 Paris, France; Inserm U968, université UPMC Paris VI, UMR S 968, CNRS, UMR 7210, 75012 Paris, France
| | - A Denoyer
- Inserm U968, université UPMC Paris VI, UMR S 968, CNRS, UMR 7210, 75012 Paris, France; Hôpital Robert-Debré, CHU de Reims, rue du Général Koenig, 51100 Reims, France; URCA, université de Reims-Champagne-Ardenne, Reims, France.
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Chiche A, Trinh L, Baudouin C, Denoyer A. SMILE (Small Incision Lenticule Extraction) among the corneal refractive surgeries in 2018. J Fr Ophtalmol 2018; 41:e245-e252. [PMID: 29914764 DOI: 10.1016/j.jfo.2018.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 04/27/2018] [Accepted: 05/15/2018] [Indexed: 11/27/2022]
Abstract
Refractive surgery is a field in constant evolution. In recent years, a new procedure has appeared under the name SMILE (SMall Incision Lenticule Extraction). This technique, carried out solely with a femtosecond laser, should make it possible to better preserve corneal innervation and biomechanics. After a detailed review of the technique itself, we then focus on the scientific evidence for the safety and efficacy of SMILE and its current indications. Advantages of SMILE will be discussed in comparison to the conventional techniques, particularly concerning dry eye and the risk of corneal ectasia related to LASIK. Lastly, the current limitations of SMILE (indications, retreatment) are discussed, and future applications are considered regarding new improvements in the technique.
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Affiliation(s)
- A Chiche
- Ophthalmology Service 3, Quinze-Vingts National Ophthalmology Hospital, University of Versailles Saint-Quentin-en-Yvelines, 78000 Versailles, France
| | - L Trinh
- Ophthalmology Service 3, Quinze-Vingts National Ophthalmology Hospital, University of Versailles Saint-Quentin-en-Yvelines, 78000 Versailles, France; Espace Nouvelle Vision, 75012 Paris, France
| | - C Baudouin
- Ophthalmology Service 3, Quinze-Vingts National Ophthalmology Hospital, University of Versailles Saint-Quentin-en-Yvelines, 78000 Versailles, France; INSERM, U968, 75012 Paris, France; UMR S 968, Institut de la Vision, University UPMC Paris VI, 75012 Paris, France; CNRS, UMR 7210, 75012 Paris, France
| | - A Denoyer
- INSERM, U968, 75012 Paris, France; UMR S 968, Institut de la Vision, University UPMC Paris VI, 75012 Paris, France; CNRS, UMR 7210, 75012 Paris, France; University Hospital Robert-Debré, rue du Général-Koenig, 51100 Reims, France; URCA, University of Reims Champagne-Ardenne, 51100 Reims, France.
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Affiliation(s)
- L. Trinh
- School
of Chemical Engineering and Analytical Sciences, University of Manchester, Manchester M13 9PL, U.K
| | - A. R. Willey
- Safety and Environmental Assurance Centre, Unilever R&D, Colworth Science Park, Sharnbrook, Bedford MK441LQ, U.K
| | - P. J. Martin
- School
of Chemical Engineering and Analytical Sciences, University of Manchester, Manchester M13 9PL, U.K
| | - J. Ashley
- Advanced
Diagnostics and Sensors Group, Cranfield University, Bedford MK43 0AL, U.K
| | - I. E. Tothill
- Advanced
Diagnostics and Sensors Group, Cranfield University, Bedford MK43 0AL, U.K
| | - T. L. Rodgers
- School
of Chemical Engineering and Analytical Sciences, University of Manchester, Manchester M13 9PL, U.K
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Cheung DSM, Trinh L, Edirimanne S, Eslick G. Abstract P3-14-08: Immediate breast reconstruction is highly accepted by breast cancer patients undergoing mastectomy when routinely offered- Recent experience of an Australian tertiary oncoplastic breast unit. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p3-14-08] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Introduction:
Despite recommendations by breast cancer guidelines, that immediate breast reconstruction (IBR) should be offered to all breast cancer patients considered for mastectomy national IBR rates have been reported as low as 12% in Australia. We report our oncoplastic breast cancer unit experience on acceptance of IBR, where it is routinely offered for all the medical fit breast cancer patients.
Methods:
We retrospectively reviewed, prospectively collected data on IBR by 3 oncoplastic breast cancer surgeons from 1st of September 2014 to 31st of March 2016.Patients were considered to be unfit for IBR if they were American Society of Anasthesiologist (ASA) Score 4 or 5, have unstable psychiatric illness, inflammatory breast cancer or high metastatic cancer burden. All the patients who were fit for IBR were offered both prosthetic and autologous IBR options.
Results:
137 patients underwent mastectomy operation, of whom 27 were considered unfit for IBR. Of the remaining 110 patients, 84 (76%) accepted IBR. Of the patients who had IBR 64 (76%) had single stage prosthetic, 15 (18%) two stage prosthetic and 5 (6%) autologous reconstructions. Those who accepted IBR were younger compared to those who didn't have IBR (median age: 47 yrs vs. 67 yrs, p<0.001), and were more likely to be in current relationship (78.57% vs. 61.54%, p=0.06). All the three surgeons had high IBR acceptance rates (70.45%, 71.43%, 84.44%) and patient insurance status did not influence IBR acceptance rate (public 57% vs. private 65%, p=0.47). The majority of patients (25 of 26) who did not accept IBR stated that breast reconstruction was not important for their body image.
Conclusion:
Our recent data shows, in Australia, when routinely offered to breast cancer patients who are fit for reconstructive surgery by oncoplastic breast cancer surgeons, IBR is highly accepted. Younger patients and those who are in current relationship, were more likely to accept IBR, whereas, individual perception of insignificance of breast reconstruction for the body image was the main determinant of not accepting IBR.
Citation Format: Cheung DSM, Trinh L, Edirimanne S, Eslick G. Immediate breast reconstruction is highly accepted by breast cancer patients undergoing mastectomy when routinely offered- Recent experience of an Australian tertiary oncoplastic breast unit [abstract]. In: Proceedings of the 2016 San Antonio Breast Cancer Symposium; 2016 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2017;77(4 Suppl):Abstract nr P3-14-08.
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Affiliation(s)
- DSM Cheung
- Nepean Hospital, Sydney, Australia; University of Sydney, Sydney, Australia
| | - L Trinh
- Nepean Hospital, Sydney, Australia; University of Sydney, Sydney, Australia
| | - S Edirimanne
- Nepean Hospital, Sydney, Australia; University of Sydney, Sydney, Australia
| | - G Eslick
- Nepean Hospital, Sydney, Australia; University of Sydney, Sydney, Australia
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Regnell SE, Peterson P, Trinh L, Broberg P, Leander P, Lernmark Å, Månsson S, Elding Larsson H. Pancreas volume and fat fraction in children with Type 1 diabetes. Diabet Med 2016; 33:1374-9. [PMID: 26996278 DOI: 10.1111/dme.13115] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/14/2016] [Indexed: 12/11/2022]
Abstract
AIMS People with Type 1 diabetes have smaller pancreases than healthy individuals. Several diseases causing pancreatic atrophy are associated with pancreatic steatosis, but pancreatic fat in Type 1 diabetes has not been measured. This cross-sectional study aimed to compare pancreas size and fat fraction in children with Type 1 diabetes and controls. METHODS The volume and fat fraction of the pancreases of 22 children with Type 1 diabetes and 29 controls were determined using magnetic resonance imaging. RESULTS Pancreas volume was 27% smaller in children with diabetes (median 34.9 cm(3) ) than in controls (47.8 cm(3) ; P < 0.001). Pancreas volume correlated positively with age in controls (P = 0.033), but not in children with diabetes (P = 0.649). Pancreas volume did not correlate with diabetes duration, but it did correlate positively with units of insulin/kg body weight/day (P = 0.048). A linear model of pancreas volume as influenced by age, body surface area and insulin units/kg body weight/day found that insulin dosage correlated with pancreas volume after controlling for both age and body surface area (P = 0.009). Pancreatic fat fraction was not significantly different between the two groups (1.34% vs. 1.57%; P = 0.891). CONCLUSIONS Our findings do not indicate that pancreatic atrophy in Type 1 diabetes is associated with an increased pancreatic fat fraction, unlike some other diseases featuring reduced pancreatic volume. We speculate that our results may support the hypotheses that much of pancreatic atrophy in Type 1 diabetes occurs before the clinical onset of the disease and that exogenous insulin administration decelerates pancreatic atrophy after diabetes onset.
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Affiliation(s)
- S E Regnell
- Pediatric Endocrinology, Diabetes and Celiac Disease Unit, Lund University/Clinical Research Centre and Skåne University Hospital, Malmö.
| | - P Peterson
- Medical Radiation Physics, Department of Translational Medicine, Lund University, Skåne University Hospital, Malmö
| | - L Trinh
- Medical Radiation Physics, Department of Translational Medicine, Lund University, Skåne University Hospital, Malmö
| | - P Broberg
- Department of Cancer Epidemiology, Department of Clinical Sciences, Lund University and Skåne University Hospital, Lund
| | - P Leander
- Department of Radiology, Department of Translational Medicine, Lund University and Skåne University Hospital, Malmö, Sweden
| | - Å Lernmark
- Pediatric Endocrinology, Diabetes and Celiac Disease Unit, Lund University/Clinical Research Centre and Skåne University Hospital, Malmö
| | - S Månsson
- Medical Radiation Physics, Department of Translational Medicine, Lund University, Skåne University Hospital, Malmö
| | - H Elding Larsson
- Pediatric Endocrinology, Diabetes and Celiac Disease Unit, Lund University/Clinical Research Centre and Skåne University Hospital, Malmö
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Trinh L, Guo S, Reynolds A, Moon L, Mathur S. The Supply of Selected Cardiovascular Medicines to an Older Concessional Population with Type 2 Diabetes in 2012: A Study Using Linked Data. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.217] [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]
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Ashley J, Piekarska M, Segers C, Trinh L, Rodgers T, Willey R, Tothill IE. An SPR based sensor for allergens detection. Biosens Bioelectron 2016; 88:109-113. [PMID: 27503408 DOI: 10.1016/j.bios.2016.07.101] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [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: 06/15/2016] [Revised: 07/26/2016] [Accepted: 07/28/2016] [Indexed: 10/21/2022]
Abstract
A simple, sensitive and label-free optical sensor method was developed for allergens analysis using α-casein as the biomarker for cow's milk detection, to be used directly in final rinse samples of cleaning in place systems (CIP) of food manufacturers. A Surface Plasmon Resonance (SPR) sensor chip consisting of four sensing arrays enabling the measurement of samples and control binding events simultaneously on the sensor surface was employed in this work. SPR offers several advantages in terms of label free detection, real time measurements and superior sensitivity when compared to ELISA based techniques. The gold sensor chip was used to immobilise α-casein-polyclonal antibody using EDC/NHS coupling procedure. The performance of the assay and the sensor was first optimised and characterised in pure buffer conditions giving a detection limit of 58ngmL-1 as a direct binding assay. The assay sensitivity can be further improved by using sandwich assay format and amplified with nanoparticles. However, at this stage this is not required as the detection limit achieved exceeded the required allergens detection levels of 2µgmL-1 for α-S1-casein. The sensor demonstrated good selectivity towards the α-casein as the target analyte and adequate recoveries from CIP final rinse wash samples. The sensor would be useful tool for monitoring allergen levels after cleaning procedures, providing additional data that may better inform upon wider food allergen risk management decision(s) that are made by food manufacturer. In particular, this sensor could potentially help validate or optimise cleaning practices for a given food manufacturing process.
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Affiliation(s)
- J Ashley
- Cranfield University, Advanced Diagnostics and Sensors Group, Cranfield, Bedford, MK43 0AL UK
| | - M Piekarska
- Cranfield University, Advanced Diagnostics and Sensors Group, Cranfield, Bedford, MK43 0AL UK
| | - C Segers
- Cranfield University, Advanced Diagnostics and Sensors Group, Cranfield, Bedford, MK43 0AL UK
| | - L Trinh
- University of Manchester, School of Chemical Engineering and Analytical Science, Oxford Road, Manchester, M13 9PL UK
| | - T Rodgers
- University of Manchester, School of Chemical Engineering and Analytical Science, Oxford Road, Manchester, M13 9PL UK
| | - R Willey
- Safety and Environmental Assurance Centre, Colworth Science Park, Unilever plc, Sharnbrook, Bedford, MK44 1LQ UK
| | - I E Tothill
- Cranfield University, Advanced Diagnostics and Sensors Group, Cranfield, Bedford, MK43 0AL UK.
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18
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19
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Trinh L, Saubaméa B, Auclin F, Denoyer A, Lai-Kuen R, El Hamdaoui M, Labbé A, Despiau MC, Brignole-Baudouin F, Baudouin C. Femtosecond and excimer laser-assisted endothelial keratoplasty (FELEK): A new technique of endothelial transplantation. J Fr Ophtalmol 2014; 37:211-9. [DOI: 10.1016/j.jfo.2013.07.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Revised: 07/04/2013] [Accepted: 07/05/2013] [Indexed: 11/16/2022]
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20
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Trinh L, Francoz M, Chong-Sit D, Labbé A, Dupont-Monod S, Baudouin C. Corneal imaging of intrastromal femtosecond laser treatment for presbyopia (Intracor®). J Fr Ophtalmol 2013; 36:669-76. [DOI: 10.1016/j.jfo.2012.11.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Accepted: 11/07/2012] [Indexed: 11/28/2022]
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21
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Trinh L, Lowe T, Campbell G, Withers P, Martin P. Bread dough aeration dynamics during pressure step-change mixing: Studies by X-ray tomography, dough density and population balance modelling. Chem Eng Sci 2013. [DOI: 10.1016/j.ces.2013.06.053] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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22
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Lih C, Li Y, Trinh L, Chien S, Wu X, Liu W, Williams PM. Breast cancer patients stratification by microarray-based gene expression profiling from FFPET samples. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.e22041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e22041 Background: Microarrays have been used to monitor global genes expression and have aided the identification of novel biomarkers for patients stratification and drug response prediction . To date there has been limited application of microarray- based gene expression analysis to formalin fixed paraffin embedded tissues (FFPET). FFPE tissues are the most commonly available clinical samples with documented clinical information for retrospective clinical analysis. However, FFPET RNA has proven to be an obstacle for microarray analysis because of low yield and compromised RNA integrity. Methods: Using a novel RNA amplification method, Single Primer Isothermal Amplification (SPIA, NuGEN Inc, San Carlos, CA), we amplified FFPET RNA, hybridized amplified, and labeled cDNA onto Affymetrix HG U133plus2 GeneChips. Results: We found that SPIA amplification successfully overcomes the problems of poor quality of FFPET RNA, and produced informative biological data. Comparing the gene expression data from 5 different types of FFPET archival cancer samples (breast, lung, ovarian, colon, and melanoma), we demonstrated that gene expression signatures clearly distinguish the tissue of origin. Further, from an analysis of 91 FFPET samples comprised of ER+, HER2+, triple negative breast cancer patients, and normal breast tissue, we have identified a 103 gene signature that distinguishes the intrinsic sub-types of breast cancer. Finally, the accuracy of gene expression measured by microarray was verified by real time PCR quantitation of the ERBB2 gene, resulting in a significant correlation (R = 0.88). Conclusions: We have demonstrated the feasibility of global gene expression profiling using RNA extracted from FFPET and have shown that a gene expression signature can stratify patient samples into different subtypes of disease. This study paves the way to identify novel molecular biomarkers for disease stratification and therapy response from archival FFPET samples, leading to the goals of personalized medicine. No significant financial relationships to disclose.
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Affiliation(s)
- C. Lih
- Roche Molecular Systems, Pleasanton, CA
| | - Y. Li
- Roche Molecular Systems, Pleasanton, CA
| | - L. Trinh
- Roche Molecular Systems, Pleasanton, CA
| | - S. Chien
- Roche Molecular Systems, Pleasanton, CA
| | - X. Wu
- Roche Molecular Systems, Pleasanton, CA
| | - W. Liu
- Roche Molecular Systems, Pleasanton, CA
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Trinh L, Brignole-Baudouin F, Labbe A, Raphael M, Bourges J, Baudouin C. 321 L’endothélium cornéen dans un modèle d’uvéite induite par endotoxine : corrélation entre microscopie confocale in vivo et immunohistochimie. J Fr Ophtalmol 2008. [DOI: 10.1016/s0181-5512(08)70918-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Trinh L, Han D, Huang W, Wrin T, Larson J, Kiss L, Coakley E, Petropoulos CJ, Parkin N, Whitcomb JM, Reeves JD. Validation of an enhanced sensitivity Trofile™ HIV-1 co-receptor tropism assay for selecting patients for therapy with entry inhibitors targeting CCR5. J Int AIDS Soc 2008. [DOI: 10.1186/1758-2652-11-s1-p197] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Abstract
INTRODUCTION The occurrence of a retinal fold after vitrectomy for retinal reattachment is not often described. In this case report, its treatment, prevention, and mechanism are discussed. CASE REPORT A 45-year-old pseudophakic woman experienced a superotemporal retinal detachment with macula-on and numerous retinal tears. The treatment consisted of a vitrectomy, perfluorocarbon injection, cryotherapy, and a complete fluid/gas exchange. Postoperative examination disclosed a retinal fold centered by the fovea. The treatment of this macular fold included the creation of a new detachment of the posterior pole by means of an injection of balanced saline solution into the subretinal space through a 39-gauge cannula, the injection of perfluorocarbon liquid to move the fold superiorly, endolaser at the inferior limit of the fold, and silicone oil injection. At the postoperative examination, the macula was flattened and the fold was near the superior temporal arcade. DISCUSSION The formation of a macular fold after vitrectomy was probably caused by the complete fluid/gas exchange, which displaced the subretinal fluid from the periphery to the posterior pole, detaching the macula. Tangential traction exerted by the presence of intravitreal gas and subretinal fluid might have stretched the retina and resulted in the formation of the fold. This mechanism is similar to the technique used in macular translocation surgery. To avoid this complication in macula-on retinal detachment, we suggest not using perfluorocarbon liquid systematically and replacing the complete fluid/gas exchange with a limited bubble of expansive gas combined with postoperative positioning.
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Affiliation(s)
- L Trinh
- Clinique Ophtalmologique Universitaire de Créteil, Hôpital Intercommunal et Henri Mondor (Assistance Publique des Hôpitaux de Paris), Université de Paris XII, Créteil, France
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26
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Trinh L, Fardeau C, Cassoux N, Monin C, Bodaghi B, Le Hoang P. 111 Rétinochoroïdopathie de type birdshot : analyse des formes familiales. J Fr Ophtalmol 2005. [DOI: 10.1016/s0181-5512(05)74507-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Trinh L, Hubmayr R, Boriek AM. 1 INCREASED MUSCLE SHORTENING AND MAINTENANCE OF CURVATURE OF THE MIDCOSTAL MUSCLE OF THE DIAPHRAGM DURING LARGE TIDAL BREATHING IN SUPINE DOGS. J Investig Med 2004. [DOI: 10.1136/jim-52-suppl2-167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Abstract
Endostatin, a 20 KDa fragment of collagen XVIII, was shown to have an inhibitory effect on angiogenesis and can potentially be used as a tumor growth suppressor. To obtain the amount needed for testing, the protein was successfully cloned and expressed in Pichia pastoris. At the end of the fermentation process, the concentration of the endostatin in the culture was 50 mg per liter, accompanied by 400 gr per liter (wet weight) of biomass. Before the protein can be captured and purified on a packed bed of heparin-Sepharose, the biomass must be removed. Because of the high biomass concentration, conventional biomass removal techniques like centrifugation or filtration are inefficient and cumbersome. Therefore, the expanded-bed adsorption technique was chosen as an alternative approach. An efficient procedure for the initial recovery and purification of the endostatin was developed. The process utilized a cation- exchanger resin instead of a heparin-based affinity resin, because its dynamic capacity was higher, even though it was affected by the high linear flow on the expanded bed. After adjusting the conductivity, pH and biomass concentration, the complete broth was pumped directly on the expanded-bed matrix (Streamline SP XL). Though the yields of protein are similar, the expanded-bed approach is superior to the packed-bed method for several reasons. The expanded-bed process was shorter (only 8 hours compared to 16 hours for the packed bed), it is cheaper, and the product has higher specific activity (29% compared with 18%). Endostatin produced by the expanded-bed adsorption method showed the expected bioactivity and is currently being tested for its potential as a tumor suppressor.
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Affiliation(s)
- L Trinh
- Biotechnology Unit, NIH, NIDDK, Bethesda, MD 20892-2715, USA
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29
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Trinh L, Ziegler R, Watling D, Snider RM, Croze E. Development of an Immunofluorometric, High-Capacity, Cell-Based Assay for the Measurement of Human Type I and Type II Interferons. J Biomol Screen 2000; 4:33-37. [PMID: 10838410 DOI: 10.1177/108705719900400106] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We have developed a cell-based 96-well microtiter plate, high throughput assay for measuring both type I and type II interferon (IFN) activity on human cells. This assay makes use of a previously described IFN-specific reporter stably expressed in human HT 1080 cells. The induction of the reporter by IFN is determined by measuring the IFN-dependent expression of CD2 on the cell surface. The cytokine-induced expression of CD2 occurs within 48 h and is measured using a time-resolved fluorometric immunoassay. The limit of detection for type I IFN is.0.4 IU/ml. Interassay and intraassay coefficients of variation were 1.1% and 1.3% for the medium control (31 IU IFNb1b/ml), respectively. The limit of detection for type II IFN is.8 IU/ml, and the assay coefficients of variation are similar to those determined for type I IFNs. The level of sensitivity for this assay is comparable to other assays commonly used to measure IFN activity on cells. The current assay has an advantage over antiviral and antiproliferative assays, in that there is no requirement for the use of pathogenic virus or for determining viable cell numbers. The current assay is ideally suited for increasing sample screening and high-capacity automation, making it an excellent tool for drug discovery.
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Affiliation(s)
- L Trinh
- Department of Molecular Pharmacology, Berlex Biosciences Inc., Richmond, CA 94804
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30
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Arnaiz DO, Zhao Z, Liang A, Trinh L, Witlow M, Koovakkat SK, Shaw KJ. Design, synthesis, and in vitro biological activity of indole-based factor Xa inhibitors. Bioorg Med Chem Lett 2000; 10:957-61. [PMID: 10853668 DOI: 10.1016/s0960-894x(00)00138-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A series of indole and carbazole based inhibitors of factor Xa (FXa) has been investigated. The most potent compound inhibits FXa with a Ki of 0.2 nM and has 900- and 750-fold selectivity over thrombin and trypsin, respectively.
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Affiliation(s)
- D O Arnaiz
- Discovery Research, Berlex Biosciences, Richmond, CA 94804, USA.
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31
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Zhao Z, Arnaiz DO, Griedel B, Sakata S, Dallas JL, Whitlow M, Trinh L, Post J, Liang A, Morrissey MM, Shaw KJ. Design, synthesis, and in vitro biological activity of benzimidazole based factor Xa inhibitors. Bioorg Med Chem Lett 2000; 10:963-6. [PMID: 10853669 DOI: 10.1016/s0960-894x(00)00139-6] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Inhibitors based on the benzimidazole scaffold showed subnanomolar potency against Factor Xa with 500-1000-fold selectivity against thrombin and 50-100-fold selectivity against trypsin. The 2-substituent on the benzimidazole ring had a strong impact on the FXa inhibitory activity. Crystallography studies suggest that the 2-substituent may have a conformational effect favoring the extended binding conformation.
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Affiliation(s)
- Z Zhao
- Discovery Research, Berlex Biosciences, Richmond, CA 94804-0099, USA.
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32
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Phillips G, Davey DD, Eagen KA, Koovakkat SK, Liang A, Ng HP, Pinkerton M, Trinh L, Whitlow M, Beatty AM, Morrissey MM. Design, synthesis, and activity of 2,6-diphenoxypyridine-derived factor Xa inhibitors. J Med Chem 1999; 42:1749-56. [PMID: 10346927 DOI: 10.1021/jm980667k] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [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: 11/28/2022]
Abstract
A novel series of 2,6-diphenoxypyridines has been designed to inhibit factor Xa, a serine protease strategically located in the coagulation cascade. The evolution from the photochemically unstable bisamidine (Z,Z)-BABCH to potent bisamidine compounds with a pyridine heterocycle as the core scaffold has been achieved. The most potent compound in the series, 6h, has a Ki for human factor Xa of 12 nM. The selectivity of 6h against bovine trypsin and human thrombin was greater than 90- and 1000-fold, respectively. Two proposed modes of binding of 6h to factor Xa are made based on the crystal structures of 6h by itself and of 6h bound to bovine trypsin.
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Affiliation(s)
- G Phillips
- Discovery Research, Berlex Biosciences, 15049 San Pablo Avenue, P.O. Box 4099, Richmond, California 94804-0099, USA
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Phillips GB, Buckman BO, Davey DD, Eagen KA, Guilford WJ, Hinchman J, Ho E, Koovakkat S, Liang A, Light DR, Mohan R, Ng HP, Post JM, Shaw KJ, Smith D, Subramanyam B, Sullivan ME, Trinh L, Vergona R, Walters J, White K, Whitlow M, Wu S, Xu W, Morrissey MM. Discovery of N-[2-[5-[Amino(imino)methyl]-2-hydroxyphenoxy]-3, 5-difluoro-6-[3-(4, 5-dihydro-1-methyl-1H-imidazol-2-yl)phenoxy]pyridin-4-yl]-N-methylgl y cine (ZK-807834): a potent, selective, and orally active inhibitor of the blood coagulation enzyme factor Xa. J Med Chem 1998; 41:3557-62. [PMID: 9733480 DOI: 10.1021/jm980280h] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- G B Phillips
- Discovery Research, Berlex Biosciences, 15049 San Pablo Avenue, P.O. Box 4099, Richmond, California 94804-0099, USA
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Buckman BO, Mohan R, Koovakkat S, Liang A, Trinh L, Morrissey MM. Design, synthesis, and biological activity of novel purine and bicyclic pyrimidine factor Xa inhibitors. Bioorg Med Chem Lett 1998; 8:2235-40. [PMID: 9873520 DOI: 10.1016/s0960-894x(98)00386-2] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The synthesis of amidinoaryloxy 9-benzyl-8-methyl-9H-purine, 7,8-dihydropteridine-6(5H)-one and 5,7-dihydropyrimido[4,5-b][1,4]oxazine-6-one inhibitors of Factor Xa is described. These compounds show nanomolar potency against FXa and maintain high selectivity over thrombin and trypsin.
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35
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Mohan R, Yun W, Buckman BO, Liang A, Trinh L, Morrissey MM. Solid-phase synthesis of N-substituted amidinophenoxy pyridines as factor XA inhibitors. Bioorg Med Chem Lett 1998; 8:1877-82. [PMID: 9873451 DOI: 10.1016/s0960-894x(98)00333-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An arylamidine linker has been employed for the solid-phase synthesis of N-substituted amidinoaryloxypyridine analogs 2 via nucleophilic substitution on a fluoropyridyl template. Two novel N-substituted amidinoaryloxypyridine derivatives 2a and 2b were discovered via this approach.
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Affiliation(s)
- R Mohan
- Pharmaceuticals Discovery, Berlex Biosciences, Richmond, CA 94804, USA
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36
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Werner MH, Clore GM, Fisher CL, Fisher RJ, Trinh L, Shiloach J, Gronenborn AM. Correction of the NMR structure of the ETS1/DNA complex. J Biomol NMR 1997; 10:317-328. [PMID: 9460239 DOI: 10.1023/a:1018399711996] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The ETS family of transcription factors consists of a group of proteins that share a highly conserved 85 amino acid DNA-binding domain (DBD). This family recognizes a consensus sequence rich in purine bases with a central GGAA motif. A comparison of the published three-dimensional structures of the DBD/DNA complexes of ETS1 by NMR [Werner et al. (1995) Cell, 83, 761-771] and the related Pu.1 by X-ray crystallography [Kodandapani et al. (1996) Nature, 380, 456-460] reveals an apparent discrepancy in which the protein domains bind with opposite polarity to their target sequences. This surprising and highly unlikely result prompted us to reexamine our NMR structure. Additional NMR experiments now reveal an error in the original interpretation of the spectra defining the orientation of the ETS1-DBD on DNA. It was originally reported that the ETS1-DBD bound to DNA with a bipartite motif involving major groove recognition via a helix-turn-helix element and minor groove recognition via protein side-chain intercalation. The presence of intercalation was deduced on the basis of numerous NOEs between several amino acids in the protein and a resonance at 12.33 ppm originally assigned to a DNA imino proton. New NMR experiments now conclusively demonstrate that this resonance, which is located within the DNA imino proton region of the spectrum, arises from the hydroxyl proton of Tyr86. Realization of this error necessitated reanalysis of the intermolecular NOEs. This revealed that the orientation of the ETS1-DBD in the complex is opposite to that originally reported and that a tryptophan residue does not intercalate into the DNA. The calculation of a new ensemble of structures based on the corrected data indicates that the structure of the ETS1-DBD/DNA complex is indeed similar to the X-ray structure of the Pu.1-DBD/DNA complex.
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Affiliation(s)
- M H Werner
- Laboratory of Chemical Physics, NIDDKD, National Institutes of Health, Bethesda, MD 20892-0520, USA
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37
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Abstract
The terminal deoxynucleotidyltransferase (TdT) gene represents an attractive model for the analysis of gene regulation during an early phase of lymphocyte development. In previous studies, we identified a DNA element, termed D', which is essential for TdT promoter activity in immature lymphocytes, and two classes of D'-binding factors, Ikaros proteins and Ets proteins. Here, we report a detailed mutant analysis of the D' element which suggests that an Ets protein, rather than an Ikaros protein, activates TdT transcription. Since multiple Ets proteins are expressed in developing lymphocytes and are capable of binding to the D' element, DNA affinity chromatography was used to determine if one of the Ets proteins might bind to the D' element with a uniquely high affinity, thereby implicating that protein as a potential TdT activator. Indeed, one binding activity was greatly enriched in the high-salt eluates from a D' affinity column. Peptide microsequencing revealed that the enriched protein was Elf-1. Immunoblot analyses confirmed that in nuclear extracts, Elf-1 has a significantly higher affinity for the D' sequence than does another Ets protein, Ets-1. Transactivation and expression studies support the hypothesis that Elf-1 activates TdT transcription in immature T and B cells. Finally, a D' mutation which selectively reduces Elf-1 binding, but not the binding of other Ets proteins, was found to greatly reduce TdT promoter activity. Although Elf-1 previously had been implicated in the inducible activation of genes in mature T and B cells, our results suggest that it also plays an important role in regulating genes during an early phase of lymphocyte development.
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Affiliation(s)
- P Ernst
- Department of Microbiology and Immunology, UCLA School of Medicine, Los Angeles, California 90095-1662, USA
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O'Connor KA, McBride MJ, West M, Yu H, Trinh L, Yuan K, Lee T, Zusman DR. Photolyase of Myxococcus xanthus, a Gram-negative eubacterium, is more similar to photolyases found in Archaea and "higher" eukaryotes than to photolyases of other eubacteria. J Biol Chem 1996; 271:6252-9. [PMID: 8626418 DOI: 10.1074/jbc.271.11.6252] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [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: 01/31/2023] Open
Abstract
We report the identification of the gene encoding a DNA photolyase (phrA) from the Gram-negative eubacterium Myxococcus xanthus. The deduced amino acid sequence of M. xanthus photolyase indicates that the protein contains 401 amino acids (Mr 45,071). By comparison of the amino acid and DNA sequences with those of other known photolyases, it has been found that it is more similar to the deduced amino acid sequences of the photolyases of "higher" eukaryotes than to the photolyases of other eubacteria. Recombinant plasmids carrying M. xanthus phrA rescue the photoreactivation activity of an irradiated strain of Escherichia coli with a deletion in phrA. This rescue is light-dependent.
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Affiliation(s)
- K A O'Connor
- Department of Molecular and Cell Biology, University of California, Berkeley 94720-3204, USA
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Pozsgay V, Trinh L, Shiloach J, Robbins JB, Donohue-Rolfe A, Calderwood SB. Purification of subunit B of Shiga toxin using a synthetic trisaccharide-based affinity matrix. Bioconjug Chem 1996; 7:45-55. [PMID: 8741990 DOI: 10.1021/bc9500711] [Citation(s) in RCA: 12] [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: 02/01/2023]
Abstract
The blood group P1 antigenic trisaccharide (3), which is the receptor-binding ligand of Shiga-like toxins, is synthesized in a spacer-equipped form (32) from 2-(trimethylsilyl)ethyl glucoside 5 and the 1-thiogalactoside building blocks 10 and 22 in a stereocontrolled, stepwise fashion. Covalent attachment of 32 to hydrazine group-containing agarose gel by reductive amination provided the P1 trisaccharide-containing affinity sorbent which was used for preparative scale isolation of subunit B of Shiga toxin.
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Affiliation(s)
- V Pozsgay
- Laboratory of Developmental and Molecular Immunity, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892, USA
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Werner MH, Clore M, Fisher CL, Fisher RJ, Trinh L, Shiloach J, Gronenborn AM. The solution structure of the human ETS1-DNA complex reveals a novel mode of binding and true side chain intercalation. Cell 1995; 83:761-71. [PMID: 8521493 DOI: 10.1016/0092-8674(95)90189-2] [Citation(s) in RCA: 99] [Impact Index Per Article: 3.4] [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: 01/31/2023]
Abstract
The solution structure of a 24.4 kDa specific complex of the DNA-binding domain (DBD) of the human ETS1 (hETS1) oncoprotein with a 17-mer DNA has been solved by NMR. The interaction of the hETS1 DBD with DNA reveals a surprising twist on the general features of helix-turn-helix (HTH)-DNA interactions. Major groove recognition involves the C-terminal two thirds of the HTH recognition helix, while minor groove recognition occurs via true intercalation of the side chain of Trp-28, which extends from the minor to the major groove. This results in a sharp kink of approximately 60 degrees and a widening of the minor groove over one-half turn of the DNA. The orientation of the HTH element of the hETS1 DBD with respect to the major groove is significantly rotated relative to other HTH proteins. These observations establish the ETS family of DNA-binding proteins as a distinct family of HTH proteins.
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Affiliation(s)
- M H Werner
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, USA
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41
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Abstract
There is mounting evidence on the role of oxygen-derived free radicals in causing damage to various cellular components. However, most studies reported in the literature have been conducted under conditions where cells were challenged with chemical free radical generating systems. In contrast, we measured DNA strand breaks, through a relatively simple and sensitive technique, as a function of the dissolved oxygen tension in a bioreactor. Cells were exposed to a step change in oxygen tension at mid-exponential growth phase. Several levels of oxygen were tested (200, 300, and 476% dissolved oxygen with respect to air saturation at 1 atmosphere) and compared against a control (10% dissolved oxygen). Hyperoxia was found to cause monotonically increasing DNA strand breakage at all the oxygen levels. In addition, hyperoxia was found to affect other metabolic functions such as the glucose consumption rate, lactate production rate, and cell growth. When hyperoxia-induced DNA strand breakage was compared to that induced by exposure to hydrogen peroxide, a similar response was observed. Exposure to a dissolved oxygen level of 200% induced DNA strand breakage comparable to a bolus of 4.2 microM hydrogen peroxide. Our results show that there is an association between hyperoxia and DNA damage.
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Affiliation(s)
- M A Cacciuttolo
- Chemical and Biochemical Engineering Program, University of Maryland Baltimore County, MD 21228
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