1
|
Kisivan K, Farkas A, Kovacs P, Glavak C, Lukacs G, Mahr K, Szabo Z, Csima MP, Gulyban A, Toth Z, Kaposztas Z, Lakosi F. Pancreatic SABR using peritumoral fiducials, triggered imaging and breath-hold. Pathol Oncol Res 2023; 29:1611456. [PMID: 38188611 PMCID: PMC10767757 DOI: 10.3389/pore.2023.1611456] [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] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 11/14/2023] [Indexed: 01/09/2024]
Abstract
Background: We aim to present our linear accelerator-based workflow for pancreatic stereotactic ablative radiotherapy (SABR) in order to address the following issues: intrafractional organ motion management, Cone Beam CT (CBCT) image quality, residual errors with dosimetric consequences, treatment time, and clinical results. Methods: Between 2016 and 2021, 14 patients with locally advanced pancreatic cancer were treated with induction chemotherapy and SABR using volumetric modulated arc therapy (VMAT). Internal target volume (ITV) concept (5), phase-gated (4), or breath hold (5) techniques were used. Treatment was verified by CBCT before and after irradiation, while tumor motion was monitored and controlled by kV triggered imaging and beam hold using peritumoral surgical clips. Beam interruptions and treatment time were recorded. The CBCT image quality was scored and supplemented by an agreement analysis (Krippendorff's-α) of breath-hold CBCT images to determine the position of OARs relative to the planning risk volumes (PRV). Residual errors and their dosimetry impact were also calculated. Progression free (PFS) and overall survival (OS) were assessed by the Kaplan-Meier analysis with acute and late toxicity reporting (CTCAEv4). Results: On average, beams were interrupted once (range: 0-3) per treatment session on triggered imaging. The total median treatment time was 16.7 ± 10.8 min, significantly less for breath-hold vs. phase-gated sessions (18.8 ± 6.2 vs. 26.5 ± 13.4, p < 0.001). The best image quality was achieved by breath hold CBCT. The Krippendorff's-α test showed a strong agreement among five radiation therapists (mean K-α value: 0.8 (97.5%). The mean residual errors were <0.2 cm in each direction resulting in an average difference of <2% in dosimetry for OAR and target volume. Two patients received offline adaptation. The median OS/PFS after induction chemotherapy and SABR was 20/12 months and 15/8 months. No Gr. ≥2 acute/late RT-related toxicity was noted. Conclusion: Linear accelerator based pancreatic SABR with the combination of CBCT and triggered imaging + beam hold is feasible. Peritumoral fiducials improve utility while breath-hold CBCT provides the best image quality at a reasonable treatment time with offline adaptation possibilities. In well-selected cases, it can be an effective alternative in clinics where CBCT/MRI-guided online adaptive workflow is not available.
Collapse
Affiliation(s)
- Katalin Kisivan
- Department of Radiotherapy, Somogy County Kaposi Mór Teaching Hospital, Kaposvár, Hungary
| | - Andrea Farkas
- Department of Radiotherapy, Somogy County Kaposi Mór Teaching Hospital, Kaposvár, Hungary
| | - Peter Kovacs
- Department of Radiotherapy, Somogy County Kaposi Mór Teaching Hospital, Kaposvár, Hungary
| | - Csaba Glavak
- Department of Radiotherapy, Somogy County Kaposi Mór Teaching Hospital, Kaposvár, Hungary
| | - Gabor Lukacs
- Department of Medical Oncology, Somogy County Kaposi Mór Teaching Hospital, Kaposvár, Hungary
| | - Karoly Mahr
- Department of Medical Oncology, Zala County Szent Raphael Hospital, Zalaegerszeg, Hungary
| | - Zsolt Szabo
- Department of Medical Oncology, Zala County Szent Raphael Hospital, Zalaegerszeg, Hungary
| | - Melinda Petone Csima
- Institute of Education, Hungarian University of Agricultural and Life Sciences, Gödöllő, Hungary
- Faculty of Health Sciences, University of Pecs, Pecs, Hungary
| | - Akos Gulyban
- Department of Medical Physics, Institut Jules Bordet, Brussels, Belgium
- Radiophysics and MRI Physics Laboratory, Université Libre De Bruxelles (ULB), Brussels, Belgium
| | - Zoltan Toth
- Medicopus Nonprofit Ltd., Somogy County Kaposi Mór Teaching Hospital, Kaposvár, Hungary
- PET Center, Somogy County Kaposi Mór Teaching Hospital, Kaposvár, Hungary
| | - Zsolt Kaposztas
- Department of Surgery, Somogy County Kaposi Mór Teaching Hospital, Kaposvár, Hungary
| | - Ferenc Lakosi
- Department of Radiotherapy, Somogy County Kaposi Mór Teaching Hospital, Kaposvár, Hungary
- Faculty of Health Sciences, University of Pecs, Pecs, Hungary
| |
Collapse
|
2
|
Veit G, Bagdany M, Xu H, Matouk E, Lukacs G. 660 Triple potentiator-mediated activation of cystic fibrosis transmembrane conductance regulator mutants with gating defects is independent of channel phosphorylation and nucleotide binding domain dimerization. J Cyst Fibros 2022. [DOI: 10.1016/s1569-1993(22)01350-9] [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: 11/07/2022]
|
3
|
Yang Z, Jiang F, Wehby J, Aleksandrov A, Estabrooks S, Brodsky J, Hirschi M, Balch W, Sabusap C, Plate L, Fang X, Hwang T, Soya N, Lukacs G, Wang C, Vorobiev S, Hunt J, Brouillette C, Kappes J. 622: CFTR protein production core: Availability of purified full-length wild-type and disease-mutant CFTR proteins and new experimental data revealing insights into CFTR function and disease mechanism. J Cyst Fibros 2021. [DOI: 10.1016/s1569-1993(21)02045-2] [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: 11/27/2022]
|
4
|
Veit G, Roldan A, Vaccarin C, Vadeboncoeur N, Bilodeau L, Matouk E, Lukacs G. 625: Optimized modulator combinations for rare CFTR mutants with good responsiveness to single correctors. J Cyst Fibros 2021. [DOI: 10.1016/s1569-1993(21)02048-8] [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: 11/26/2022]
|
5
|
|
6
|
Abstract
Purpose
The purpose of this paper is to examine England’s Accident and Emergency (A&E) arm of the National Health Service (NHS). It considers the positive impact that Lean has had and Six-Sigma can have in A&E departments to improve the quality and reliability of the service offered, in an area that is facing performance challenges.
Design/methodology/approach
Independent variables average monthly temperature data (degrees Celsius) obtained from the Met Office and weekly A&E data, patient volume is analysed alongside the dependent variable, the percentage of patients seen in 4 h or less.
Findings
The model produced a robust positive impact when Lean Six-Sigma is adopted, increasing the likelihood of A&E dependents meeting their performance objective to see and treat patients in 4 h or less.
Research limitations/implications
Further variables such as staffing levels, A&E admission type should be considered in future studies. Additionally, it would add further clarity to analyse hospitals and trusts individually, to gauge which are struggling.
Practical implications
Should the NHS further its understanding and adoption of Lean Six-Sigma, it is believed this could have significant improvements in productivity, patient care and cost reduction.
Social implications
Productivity improvements will allow the NHS to do more with an equal amount of funding, therefore improving capacity and patient care.
Originality/value
Through observing A&E and its ability to treat patients in a timely fashion it is clear the NHS is struggling to meet its performance objectives, the recommendation of Six-Sigma in A&E should improve the reliability and quality of care offered to patients.
Collapse
|
7
|
Chachaty C, Wolkowski Z, Piriou F, Lukacs G. Effets de substituants sur la relaxation spin réseau du 13C dans les chaines aliphatiques. application aux prostaglandines. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1974710487] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
|
8
|
Neszmélyi A, Hull WE, Lukacs G, Voelter W. Natural Abundance 13C—13C Coupling Constants Observed via ID and 2D INADEQUATE Experiments in Stigmasterol and 1,4-Androstadiene-3,11,17-trione. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/znb-1986-0918] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
For two steroids, stigmasterol and 1,4-androstadiene-3,11,17-trione, natural abundance 13C -13C coupling constants are determ ined by 1D and 2D INADEQUATE experiments. Besides full assignment of the 13C resonances of these steroids is achieved
Collapse
Affiliation(s)
- Andras Neszmélyi
- Central Research Institute for Chemistry, Hungarian Academy of Sciences, Pusztaszeri ut 59/67, H-1025 Budapest, Hungary
| | - William E. Hull
- BRUKER Analytische Meßtechnik GmbH , Silberstreifen, D-7512 R heinstetten 4, Germany
| | - Gabor Lukacs
- Institut de Chimie des Substances Naturelles du C .N .R .S ., F-91190 Gif-sur-Yvette, France
| | - Wolfgang Voelter
- Abteilung für Physikalische Biochemie des Physiologisch-Chemischen Instituts der Universität Tübingen, Hoppe-Seyler-Straße 1, D-7400 Tübingen, Germany
| |
Collapse
|
9
|
Maloney N, Lukacs G, Ball SL, Hegner M. Device for filamentous fungi growth monitoring using the multimodal frequency response of cantilevers. Rev Sci Instrum 2014; 85:015003. [PMID: 24517802 DOI: 10.1063/1.4854655] [Citation(s) in RCA: 5] [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] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Filamentous fungi cause opportunistic infections in hospital patients. A fast assay to detect viable spores is of great interest. We present a device that is capable of monitoring fungi growth in real time via the dynamic operation of cantilevers in an array. The ability to detect minute frequency shifts for higher order flexural resonance modes is demonstrated using hydrogel functionalised cantilevers. The use of higher order resonance modes sees the sensor dependent mass responsivity enhanced by a factor of 13 in comparison to measurements utilizing the fundamental resonance mode only. As a proof of principle measurement, Aspergillus niger growth is monitored using the first two flexural resonance modes. The detection of single spore growth within 10 h is reported for the first time. The ability to detect and monitor the growth of single spores, within a small time frame, is advantageous in both clinical and industrial settings.
Collapse
Affiliation(s)
- N Maloney
- Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, Dublin 2, Ireland
| | - G Lukacs
- Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, Dublin 2, Ireland
| | - S L Ball
- Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, Dublin 2, Ireland
| | - M Hegner
- Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, Dublin 2, Ireland
| |
Collapse
|
10
|
Limousin C, Cléophax J, Petit A, Loupy A, Lukacs G. Solvent-Free Synthesis of DecylD-Glycopyranosides Under Focused Microwave Irradiation. J Carbohydr Chem 2006. [DOI: 10.1080/07328309708006533] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
11
|
Affiliation(s)
- I. Hladezuk
- a Institut de Chimie des Substances Naturelles, C.N.R.S. , Avenue de la Terrasse, 91198 , Gif-sur-Yvette , France
| | - A. Olesker
- a Institut de Chimie des Substances Naturelles, C.N.R.S. , Avenue de la Terrasse, 91198 , Gif-sur-Yvette , France
| | - J. Cléophax
- a Institut de Chimie des Substances Naturelles, C.N.R.S. , Avenue de la Terrasse, 91198 , Gif-sur-Yvette , France
| | - G. Lukacs
- a Institut de Chimie des Substances Naturelles, C.N.R.S. , Avenue de la Terrasse, 91198 , Gif-sur-Yvette , France
| |
Collapse
|
12
|
Gyory F, Mezosi E, Szakall S, Bajnok L, Varga E, Borbely A, Gazdag A, Juhasz I, Lukacs G, Nagy EV. Establishment of the hu-PBL-SCID Mouse Model for the Investigation of Thyroid Cancer. Exp Clin Endocrinol Diabetes 2005; 113:359-64. [PMID: 16025395 DOI: 10.1055/s-2005-865740] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
New experimental models of human neoplastic diseases attempt to mimic the human environment that fostered the development of disease in cancer patients. The aim of the present study was to establish a human lymphocyte-engrafted, severe combined immunodeficient (hu-PBL-SCID) mouse model to investigate thyroid cancer and to evaluate the potential use of this model for cancer immunotherapy. Thyroid neoplastic tissues were obtained from ten patients (one follicular adenoma, five papillary, one follicular, one anaplastic and two medullary cancers). One 8 x 4 x 3 millimeter sample from each tumor was cut into two pieces of identical size and transplanted into two SCID mice. In each case, one of the two mice was injected intraperitoneally with lymphocytes from the same tumor patient for the reconstitution of the human immune system (Group A), while the other animal received no lymphocytes (Group B). The engraftment of the tumors was successful in all cases. The growth rate was highly dependent on the histological type. When histologies were compared before implantation and after the removal of the implants, the characters of the tumors proved to be unchanged, except one case where an anaplastic cancer arose from a papillary tumor. Macrophages were present in all but one papillary cancer. All differentiated thyroid cancers were infiltrated by T and B lymphocytes. Lymphocytes and macrophages disappeared from 19/20 grafts by week 16. However, in one case from group A lymphocytes were detected four months after the transplantation. In another case from group A, one papillary cancer spontaneously decreased in size and disappeared. Before implantation, HLA-DR expression was detected in every papillary cancer. HLA-DR expression in the grafts was not seen in 3/5 cases by week 16. In conclusion, an animal model has been established for the investigation of human thyroid cancer, by which the analysis of anti-tumor immunity, as a postulate of immune therapy, may be possible.
Collapse
Affiliation(s)
- F Gyory
- Department of Surgery, Medical and Health Science Center, University of Debrecen, 4012 Debrecen, Hungary
| | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Gyory F, Balazs G, Nagy EV, Juhasz F, Mezosi E, Szakall S, Math J, Lukacs G. Differentiated thyroid cancer and outcome in iodine deficiency. Eur J Surg Oncol 2004; 30:325-31. [PMID: 15028317 DOI: 10.1016/j.ejso.2003.11.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/19/2003] [Indexed: 10/26/2022] Open
Abstract
AIMS Factors influencing prognosis and long-term outcome of thyroid cancer have been described by several groups. We wished to asses the previously described prognostic factors in a moderately iodine deficient region in Hungary. METHODS Four hundred and fifty-four out of 492 patients who had surgery for papillary thyroid cancer (PTC, 386 cases) and follicular thyroid cancer (FTC, 106 cases) between 1971 and 1998 were analyzed. Survival curves were compared using the Kaplan-Meier method and Cox regression analysis. RESULTS The 10 and 20-year survival rates were 87.9 and 84% for PTC, and 78.2 and 78.2% for FTC. In PTC, extrathyroidal invasion (p<0.0001), lymph node metastasis (p<0.0001), distant metastasis (p<0.0001), and age over 40 years (p=0.002) were significant adverse predictors. In FTC, extrathyroidal invasion (p=0.003) distant metastases (p<0.0001), and age over 40 years (p=0.011) were significant adverse predictors. CONCLUSION Iodine intake did not appear to influence survival. The incidence of follicular cancer, which has less favourable prognosis, was higher in iodine deficient regions. This supports the importance of iodine supplementation in these areas.
Collapse
Affiliation(s)
- F Gyory
- 1st Department of Surgery, Medical and Health Science Center, University of Debrecen, P.O. Box 27, H-4012 Debrecen, Hungary.
| | | | | | | | | | | | | | | |
Collapse
|
14
|
Das BC, Cosson JP, Lukacs G. Structure analysis by carbon-13 nuclear magnetic resonance spectroscopy of pleiocraline, a new bisindole alkaloid from Alstonia deplanchei van Heurck et Muell. Arg. J Org Chem 2002. [DOI: 10.1021/jo00436a031] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
15
|
Frappier F, Audinot M, Beaucourt JP, Sergent L, Lukacs G. Mechanism of the backbone rearrangement of amino steroids. A carbon-13 and tritium nuclear magnetic resonance spectroscopic study of isoconessine, neoconessine and the corresponding polydeuterated and polytritiated species. J Org Chem 2002. [DOI: 10.1021/jo00140a045] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
16
|
Neszmelyi A, Lukacs G. Natural-abundance one-bond carbon-13-carbon-13 coupling constants in monosaccharide derivatives and in sucrose. J Am Chem Soc 2002. [DOI: 10.1021/ja00384a016] [Citation(s) in RCA: 13] [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] [Indexed: 11/29/2022]
|
17
|
Dessinges A, Castillon S, Olesker A, Ton That Thang, Lukacs G. Oxygen-17 NMR and oxygen-18-induced isotopic shifts in carbon-13 NMR for the elucidation of a controversial reaction mechanism in carbohydrate chemistry. J Am Chem Soc 2002. [DOI: 10.1021/ja00314a048] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
18
|
Ton That Thang, Lukacs G, Omura S, Bartner P, Boxler DL, Brambilla R, Mallams AK, Morton JB, Reichert P. Megalomicins. 6. Tertiary glycosidic macrolide antibiotics. A structural revision by carbon-13 nuclear magnetic resonance and x-ray crystallography. J Am Chem Soc 2002. [DOI: 10.1021/ja00470a069] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
19
|
Garcia-Alvarez MC, Lukacs G, Neszmelyi A, Piozzi F, Rodriguez B, Savona G. Structure of teucroxide. Application of natural-abundance carbon-13 - carbon-13 coupling constants observed via double-quantum coherence. J Org Chem 2002. [DOI: 10.1021/jo00173a068] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
20
|
Rasoanaivo P, Lukacs G. Carbon-13 nuclear magnetic resonance of natural and related products. XXI. Revision of the structure of the bisindole alkaloid 14',15'-dihydropycnanthine. Carbon-13 nuclear magnetic resonance study. J Org Chem 2002. [DOI: 10.1021/jo00864a045] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
21
|
|
22
|
Dessinges A, Cabrera Escribano F, Lukacs G, Olesker A, Ton That Thang. Synthesis of derivatives of 3-amino-2,2-difluoro-2,3,6-trideoxy-L-lyxopyranose (2,2-difluorodaunosamine). J Org Chem 2002. [DOI: 10.1021/jo00384a055] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
23
|
Costa SS, Olesker A, Ton That Thang, Lukacs G. Synthesis of two fragments of the 14-membered macrolide antibiotic oleandomycin from D-glucose. J Org Chem 2002. [DOI: 10.1021/jo00187a008] [Citation(s) in RCA: 6] [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: 11/30/2022]
|
24
|
Alves RJ, Castillon S, Dessinges A, Herczegh P, Lopez JC, Lukacs G, Olesker A, Ton That Thang. A route to functionalized branched-chain amino sugars via nitrous acid promoted spiroaziridine formation. J Org Chem 2002. [DOI: 10.1021/jo00254a048] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
25
|
Frappier F, Hull WE, Lukacs G. Mechanism of the backbone rearrangement of amino steroids. High-field proton, deuterium, carbon-13, and hydrogen-1 two-dimensional nuclear magnetic resonance spectroscopic study of isoholamine and polydeuterated isoholamine. J Org Chem 2002. [DOI: 10.1021/jo00334a051] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
26
|
Ahond A, Janot MM, Langlois N, Lukacs G, Potier P, Rasoanaivo P, Sangare M, Neuss N, Plat M. Carbon-13 nuclear magnetic resonance spectroscopy of naturally occurring substances. XXIII. Structure of vindolinine. J Am Chem Soc 2002. [DOI: 10.1021/ja00809a078] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
27
|
Faghih R, Fontaine C, Horibe I, Imamura PM, Lukacs G, Olesker A, Seo S. Determination of the absolute configuration of chiral secondary alcohols from tetra-O-acetylglucosidation-induced proton nuclear magnetic resonance shifts. J Org Chem 2002. [DOI: 10.1021/jo00224a053] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
28
|
Castillon S, Dessinges A, Faghih R, Lukacs G, Olesker A, Ton That Thang. Synthesis of 2'-C-.beta.-fluorodaunomycin. An example of configurational retention in fluorodehydroxylation with diethylaminosulfur trifluoride. J Org Chem 2002. [DOI: 10.1021/jo00224a052] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
29
|
Kurashima K, Szabó EZ, Lukacs G, Orlowski J, Grinstein S. Endosomal recycling of the Na+/H+ exchanger NHE3 isoform is regulated by the phosphatidylinositol 3-kinase pathway. J Biol Chem 1998; 273:20828-36. [PMID: 9694828 DOI: 10.1074/jbc.273.33.20828] [Citation(s) in RCA: 136] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The NHE3 isoform of the Na+/H+ exchanger localizes to both the plasmalemmal and endosomal compartments in polarized epithelial and transfected Chinese hamster ovary (AP-1) cells. It is unclear how the distribution of NHE3 between these compartments is regulated. In this study, we examined the potential involvement of phosphatidylinositol 3'-kinase (PI3-K) in regulating the activity and distribution of NHE3, as this lipid kinase has been implicated in modulating vesicular traffic in the endosomal recycling pathway. Wortmannin and LY294002, both potent inhibitors of PI3-K, markedly inhibited NHE3-mediated H+ extrusion across the plasma membrane in a concentration- and time-dependent manner. The subcellular distribution of the antiporters was monitored by transfecting epitope-tagged NHE3 into AP-1 cells. In parallel with the inhibition of transport, PI3-K antagonists induced a pronounced loss of NHE3 from the cell surface and its accumulation in an intracellular compartment, as assessed by immunofluorescence microscopy and enzyme-linked immunosorbent assays. Further analysis using cells transfected with antiporters bearing an external epitope tag revealed that the redistribution reflected primarily a decrease in the rate of recycling of intracellular NHE3 to the cell surface. The wortmannin-induced inhibition and redistribution of NHE3 were prevented when cells were incubated at 4 degreesC, consistent with the known temperature dependence of the endocytic process. These observations demonstrate that NHE3 activity is controlled by dynamic endocytic and recycling events that are modulated by PI3-K.
Collapse
Affiliation(s)
- K Kurashima
- Cell Biology Programme, Research Institute, Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada
| | | | | | | | | |
Collapse
|
30
|
D'Souza S, Garcia-Cabado A, Yu F, Teter K, Lukacs G, Skorecki K, Moore HP, Orlowski J, Grinstein S. The epithelial sodium-hydrogen antiporter Na+/H+ exchanger 3 accumulates and is functional in recycling endosomes. J Biol Chem 1998; 273:2035-43. [PMID: 9442041 DOI: 10.1074/jbc.273.4.2035] [Citation(s) in RCA: 174] [Impact Index Per Article: 6.7] [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: 02/05/2023] Open
Abstract
Na+/H+ exchangers (NHEs) mediate electroneutral exchange of Na+ for H+ and thereby play a central role in pH regulation and Na+ homeostasis. NHE3, the predominant epithelial isoform, is found in apical membranes of renal and intestinal epithelial cells, where it contributes to NaCl (re)absorption. NHE activity has been detected in endomembrane vesicles of epithelial cells, but the precise compartment involved and its functional role have not been defined. Many aspects of the targeting machinery that defines the compartmentation and polarity of epithelia are also functional in nonepithelial cells. We therefore compared the targeting of NHE1, the basolateral isoform, with that of NHE3 in Chinese hamster ovary cells. To circumvent the confounding effects of endogenous exchangers, epitope-tagged constructs of NHE1 and NHE3 were stably expressed in antiport-deficient (AP-1) cells. While NHE1 was found almost exclusively in the surface membrane, NHE3 was also found intracellularly, accumulating in a juxtanuclear compartment. Confocal microscopy showed this compartment to be distinct from the Golgi, trans-Golgi network, and lysosomes. Instead, NHE3 colocalized with transferrin receptors and with cellubrevin, markers of recycling endosomes. The activity of NHE3 in endomembranes was assessed by targeting pH-sensitive probes to the recycling endosomes using a chimeric cellubrevin construct with an accessible extracellular epitope. Fluorescence ratio imaging indicated that cellubrevin resides intracellularly in an acidic compartment. In AP-1 cells, endosomal acidification was unaffected by omission of Na+ but was dissipated entirely by concanamycin, a blocker of H(+)-ATPases. In contrast, the cellubrevin compartment was more acidic in NHE3 transfectants, and the acidification was only partially reduced by concanamycin. Moreover, removal of extracellular Na+ resulted in a significant alkalization of the endocytic compartment. These results indicate that NHE3 is present and active in recycling endosomes. By recruiting NHE3 to the plasma membrane, modulation of vesicular traffic could contribute to the regulation of Na+ reabsorption across epithelia.
Collapse
Affiliation(s)
- S D'Souza
- Division of Cell Biology, Hospital for Sick Children, Toronto, Ontario, Canada
| | | | | | | | | | | | | | | | | |
Collapse
|
31
|
|
32
|
Grandjean C, Lukacs G. Preparation and in vitro antibacterial activity of 9-O-glycosyloxime derivatives of erythromycin A, a new class of macrolide antibiotics. J Antibiot (Tokyo) 1996; 49:1036-43. [PMID: 8968398 DOI: 10.7164/antibiotics.49.1036] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
9-O-Glycosyloxime derivatives of erythromycin A have been synthesized and their in vitro antibacterial activity compared with that of erythromycin A (1). This new class of macrolide antibiotics showed reduced antibacterial spectrum. However, some derivatives were as or more active than erythromycin A (1) against strains, responsible for respiratory track infections, such as Haemophilus influenzae, Moraxella catarrhalis or Streptococcus pneumoniae.
Collapse
Affiliation(s)
- C Grandjean
- Institut de Chimie des Substances Naturelles du CNRS, Gif sur Yvette, France
| | | |
Collapse
|
33
|
|
34
|
Cabado AG, Yu FH, Kapus A, Lukacs G, Grinstein S, Orlowski J. Distinct structural domains confer cAMP sensitivity and ATP dependence to the Na+/H+ exchanger NHE3 isoform. J Biol Chem 1996; 271:3590-9. [PMID: 8631966 DOI: 10.1074/jbc.271.7.3590] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.4] [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] Open
Abstract
Agents known to increase cAMP levels in renal and intestinal epithelia decrease sodium absorption by inhibiting NHE3, an isoform of the Na+/H+ exchanger expressed at high levels in apical membranes of these cells. In contrast, the ubiquitous, housekeeping isoform of the exchanger (NHE1) is stimulated by cAMP in some cell types. Optimal activity of NHE3 as well as NHE1 requires the presence of ATP. To gain insight into the molecular mechanisms of ATP dependence and cAMP regulation of NHE3, a series of mutations were constructed by progressively truncating segments of the C-terminal cytoplasmic domain of the transporter at amino acid positions 684, 638, and 579 (named NHE3delta684, NHE3delta638, and NHE3delta579). In addition, chimeric antiporters were constructed with the N-terminal transmembrane domain of NHE3 linked to the entire cytoplasmic region of NHE1 (chimera NHE3/1) or vice versa (chimera NHE1/3). These constructs were heterologously expressed in antiport-deficient Chinese hamster ovary cells, and their activities were assessed by fluorimetric measurements of intracellular pH and by radioisotope determinations of Na+ influx. Forskolin, which directly stimulates adenylate cyclase, inhibited NHE3 as well as NHE1/3, but not NHE3/1, suggesting that the cytoplasmic domain of NHE3 was sufficient to confer sensitivity to inhibition by cAMP. Forskolin also inhibited the truncated mutant NHE3delta684 to an extent similar to that for wild type NHE3. However, the inhibitory effect was greatly reduced in NHE3delta638 and more profound truncations (NHE3delta579 obliterated the effect of forskolin. These findings suggest that a region found between amino acids 579 and 684 is essential for the cAMP response of NHE3. In contrast, comparable ATP dependence was observed in all exchanger constructs examined. These observations indicate that ATP dependence is conferred by a region of the molecule in or adjacent to the transmembrane domain, which is most conserved between isoforms. It is concluded that different sites, and therefore different mechanisms, underlie inhibition of NHE3 by cAMP and by depletion of ATP.
Collapse
Affiliation(s)
- A G Cabado
- Division of Cell Biology, Research Institute, Hospital for Sick Children, M5G 1X8 Toronto, Ontario, Canada
| | | | | | | | | | | |
Collapse
|
35
|
Pipelier M, Ermolenko MS, Zampella A, Olesker A, Lukacs G. Intramolecular Horner-Wadsworth-Emmons Olefination Route to Annulated Carbohydrates. Synlett 1996. [DOI: 10.1055/s-1996-5311] [Citation(s) in RCA: 4] [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: 10/17/2022]
|
36
|
Bianchini L, Kapus A, Lukacs G, Wasan S, Wakabayashi S, Pouysségur J, Yu FH, Orlowski J, Grinstein S. Responsiveness of mutants of NHE1 isoform of Na+/H+ antiport to osmotic stress. Am J Physiol 1995; 269:C998-1007. [PMID: 7485471 DOI: 10.1152/ajpcell.1995.269.4.c998] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Hypertonic activation of NHE1, the ubiquitous Na+/H+ exchanger, plays a central role in cell volume regulation, yet little is known about the underlying mechanism. We probed the osmotic responsiveness of full-length and truncated constructs of NHE1 transfected into cells lacking endogenous antiport activity. The hypertonic stimulation of NHE1 was preserved after heterologous transfection of the full-length NHE1 or of constructs truncated at positions 698 or 703. In contrast, mutants truncated at position 635 (delta 635) failed to respond to osmotic challenge. Transfectants (delta 635) behaved as if constitutively activated, having a permanently elevated cytosolic pH (pHi) under isotonic, unstimulated conditions. The delta 635 mutant displayed H+ binding with high affinity and low cooperativity. Constructs delta 582 or delta 566 had a reduced H+ sensitivity and were therefore inactive at resting pHi. Such cells were unresponsive to osmotic stress near physiological pHi but could be activated by shrinking after an acid load. Jointly, these results suggest that the H+ affinity and high cooperativity of the antiporter, earlier attributed to a single "modifier site," can be varied independently and are probably controlled by different regions of the molecule. The data indicate that volume or osmolarity-sensitive site(s) exist between the NH2-terminus and residue 566. This putative volume-sensitive site is therefore different from the site(s) postulated to mediate the stimulatory effects of calcium and growth factors.
Collapse
Affiliation(s)
- L Bianchini
- Centre de Biochimie-Centre National de la Recherche Scientifique, Université de Nice, France
| | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Abstract
20-Homo tylosin, 20-nor tylosin, 20-deoxy-19,20-didehydro tylosin (6-vinyl tylosin) and 2",3"-didehydro-3"-deoxy tylosin were prepared by multi-step procedures. 20-Homo tylosin was about twice less active than tylosin while the other compounds exhibited very weak antibacterial activity.
Collapse
Affiliation(s)
- S Bobillot
- Institut de Chimie des Substances Naturelles du C.N.R.S., Gif sur Yvette, France
| | | | | | | | | | | | | |
Collapse
|
38
|
|
39
|
Herczegh P, Kovács I, Szilágyi L, Sztaricskai F, Berecibar A, Riche C, Chiaroni A, Olesker A, Lukacs G. Cycloaddition reactions of carbohydrate derivatives. Part VI. Quinolizidine analogs of castanospermine. Tetrahedron 1995. [DOI: 10.1016/0040-4020(95)00029-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
40
|
|
41
|
Deloisy S, That Thang T, Olesker A, Lukacs G. Synthesis of α-azido aldehydes. Stereoselective formal access to the immunosuppressant myriocin. Tetrahedron Lett 1994. [DOI: 10.1016/s0040-4039(00)76967-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
42
|
|
43
|
Herczegh P, Kovács I, Szilágyi L, Sztaricskai F, Berecibar A, Riche C, Chiaroni A, Olesker A, Lukacs G. Cycloaddition reactions of carbohydrate derivatives. Part V. A hetero Diels-Alder approach to swainsonine analogs. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)85680-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
44
|
Cristóbal López J, Lameignère E, Burnouf C, de los Angeles Laborde M, Ghini AA, Olesker A, Lukacs G. Efficient routes to pyranosidic homologated conjugated enals and dienes from monosaccharides. Tetrahedron 1993. [DOI: 10.1016/s0040-4020(01)87245-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
45
|
Abstract
V-ATPases in phagocytic cells are known to mediate the acidification of most intracellular organelles. Proton-pump-mediated acidification of these organellar compartments is vital to numerous cell processes, including receptor recycling, protein processing and sorting and microbial degradation. Recent studies have suggested a role for V-ATPases in cytoplasmic pH homeostasis. The present discussion will review the current knowledge regarding the presence of V-ATPases in both the plasmalemmal and organellar membranes of phagocytic cells, the regulation of proton pump activity in these locations and the functional significance of pump-mediated proton translocation.
Collapse
Affiliation(s)
- S Grinstein
- Division of Cell Biology Hospital for Sick Children, Toronto, Canada
| | | | | | | |
Collapse
|
46
|
El-Laghdach A, Isabel Matheu M, Castillón S, Bliard C, Olesker A, Lukacs G. A new and extremely fast synthesis of 2-deoxy-2,2-difluoro-d-arabino-hexose (2-deoxy-2,2-difluoro-d-glucose). Carbohydr Res 1992. [DOI: 10.1016/s0008-6215(00)90944-3] [Citation(s) in RCA: 9] [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: 10/18/2022]
|
47
|
Rubin BB, Rotstein OD, Lukacs G, Bailey D, Romaschin A, Walker PM. Decreased leukocyte adhesion with anti-CD18 monoclonal antibodies is mediated by receptor internalization. Surgery 1992; 112:263-8; discussion 268-9. [PMID: 1353640] [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: 03/25/2023]
Abstract
BACKGROUND Adhesion of polymorphonuclear leukocytes (PMNs) to endothelial cells is mediated partially by CD11/CD18 integrins. The purpose of this study was to define (1) the response of PMNs to anti-CD18 monoclonal antibody binding, and (2) the mechanism responsible for anti-CD18 monoclonal antibody-mediated decreases in PMN adhesion to endothelial cells. METHODS Canine PMN O2- production, myeloperoxidase, and lysozyme release in response to the anti-CD18 monoclonal antibody IB4 were measured by standard assays. To examine endocytosis of CD18 receptors, PMNs incubated with IB4 and a fluorescein isothiocyanate secondary antibody were analyzed by flow cytometry. RESULTS Treatment of PMNs with IB4 did not stimulate O2- production or degranulation but decreased adhesion of 51Cr-labeled PMNs to ex vivo canine aorta. Incubation of PMNs at 25 degrees C resulted in a decrease in fluorescence intensity that was not affected by NaN3 or vanadate but was blocked by NaF, 4 degrees C, and bafilomycin, which prevents endosomal acidification. Treatment with an antifluorescein antibody decreased the fluorescence intensity in NaF and 4 degrees C, but not in bafilomycin-treated neutrophils. CONCLUSIONS IB4 decreases PMN-endothelial cell adhesion but does not stimulate neutrophil oxidative metabolism or degranulation. These data suggest that reduced adhesion may be the result of internalization of the CD18/IB4 complex. Anti-CD18 monoclonal antibodies may be useful in preventing PMN adhesion without the potentially deleterious effects of cell activation.
Collapse
Affiliation(s)
- B B Rubin
- Department of Pathology, Toronto Hospital, Ontario, Canada
| | | | | | | | | | | |
Collapse
|
48
|
Rémy S, Jaekel F, Olesker A, Lukacs G. Synthesis of a chiral polysubstituted cis-fused decalin containing an angular C-methyl group by an intramolecular Diels-Alder reaction. Carbohydr Res 1992. [DOI: 10.1016/s0008-6215(00)90490-7] [Citation(s) in RCA: 3] [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: 10/18/2022]
|
49
|
Alves RJ, Garcia JI, Olesker A, Lukacs G. Synthesis of the N,N'-Dibenzoyl Derivative of the Ornithine Decarboxylase Inhibitor (2R,5R)-Hept-6-Yne-2,5-Diamine from D-Glucosamine. J Carbohydr Chem 1991. [DOI: 10.1080/07328309108543971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
50
|
Vollradt J, Harbecke W, Lukacs G, Stang W. Stillegung und Beseitigung von Kernkraftwerken - Betrieb auch ohne Stromerzeugung / Decommissioning of nuclear power plants - operation without generation of electricity. KERNTECHNIK 1990. [DOI: 10.1515/kern-1990-550216] [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: 11/15/2022]
|