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André M, Caballé A, van der Schaar M, Solsona A, Houégnigan L, Zaugg S, Sánchez AM, Castell JV, Solé M, Vila F, Djokic D, Adrián-Martínez S, Albert A, Anghinolfi M, Anton G, Ardid M, Aubert JJ, Avgitas T, Baret B, Barrios-Martí J, Basa S, Bertin V, Biagi S, Bormuth R, Bouwhuis MC, Bruijn R, Brunner J, Busto J, Capone A, Caramete L, Carr J, Celli S, Chiarusi T, Circella M, Coleiro A, Coniglione R, Costantini H, Coyle P, Creusot A, Deschamps A, De Bonis G, Distefano C, Di Palma I, Donzaud C, Dornic D, Drouhin D, Eberl T, El Bojaddaini I, Elsässer D, Enzenhöfer A, Fehn K, Felis I, Fusco LA, Galatà S, Gay P, Geißelsöder S, Geyer K, Giordano V, Gleixner A, Glotin H, Gracia-Ruiz R, Graf K, Hallmann S, van Haren H, Heijboer AJ, Hello Y, Hernandez-Rey JJ, Hößl J, Hofestädt J, Hugon C, Illuminati G, James CW, de Jong M, Jongen M, Kadler M, Kalekin O, Katz U, Kießling D, Kouchner A, Kreter M, Kreykenbohm I, Kulikovskiy V, Lachaud C, Lahmann R, Lefèvre D, Leonora E, Loucatos S, Marcelin M, Margiotta A, Marinelli A, Martínez-Mora JA, Mathieu A, Melis K, Michael T, Migliozzi P, Moussa A, Mueller C, Nezri E, Păvălaş GE, Pellegrino C, Perrina C, Piattelli P, Popa V, Pradier T, Racca C, Riccobene G, Roensch K, Saldaña M, Samtleben DFE, Sanguineti M, Sapienza P, Schnabel J, Schüssler F, Seitz T, Sieger C, Spurio M, Stolarczyk T, Sánchez-Losa A, Taiuti M, Trovato A, Tselengidou M, Turpin D, Tönnis C, Vallage B, Vallée C, Van Elewyck V, Vivolo D, Wagner S, Wilms J, Zornoza JD, Zuñiga J. Sperm whale long-range echolocation sounds revealed by ANTARES, a deep-sea neutrino telescope. Sci Rep 2017; 7:45517. [PMID: 28401960 PMCID: PMC5388847 DOI: 10.1038/srep45517] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 02/14/2017] [Indexed: 11/09/2022] Open
Abstract
Despite dedicated research has been carried out to adequately map the distribution of the sperm whale in the Mediterranean Sea, unlike other regions of the world, the species population status is still presently uncertain. The analysis of two years of continuous acoustic data provided by the ANTARES neutrino telescope revealed the year-round presence of sperm whales in the Ligurian Sea, probably associated with the availability of cephalopods in the region. The presence of the Ligurian Sea sperm whales was demonstrated through the real-time analysis of audio data streamed from a cabled-to-shore deep-sea observatory that allowed the hourly tracking of their long-range echolocation behaviour on the Internet. Interestingly, the same acoustic analysis indicated that the occurrence of surface shipping noise would apparently not condition the foraging behaviour of the sperm whale in the area, since shipping noise was almost always present when sperm whales were acoustically detected. The continuous presence of the sperm whale in the region confirms the ecological value of the Ligurian sea and the importance of ANTARES to help monitoring its ecosystems.
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Affiliation(s)
- M André
- Technical University of Catalonia, BarcelonaTech (UPC), Laboratory of Applied Bioacoustics (LAB), Rambla Exposició, 24, 08800 Vilanova i la Geltru, Barcelona, Spain
| | - A Caballé
- Technical University of Catalonia, BarcelonaTech (UPC), Laboratory of Applied Bioacoustics (LAB), Rambla Exposició, 24, 08800 Vilanova i la Geltru, Barcelona, Spain
| | - M van der Schaar
- Technical University of Catalonia, BarcelonaTech (UPC), Laboratory of Applied Bioacoustics (LAB), Rambla Exposició, 24, 08800 Vilanova i la Geltru, Barcelona, Spain
| | - A Solsona
- Technical University of Catalonia, BarcelonaTech (UPC), Laboratory of Applied Bioacoustics (LAB), Rambla Exposició, 24, 08800 Vilanova i la Geltru, Barcelona, Spain
| | - L Houégnigan
- Technical University of Catalonia, BarcelonaTech (UPC), Laboratory of Applied Bioacoustics (LAB), Rambla Exposició, 24, 08800 Vilanova i la Geltru, Barcelona, Spain
| | - S Zaugg
- Technical University of Catalonia, BarcelonaTech (UPC), Laboratory of Applied Bioacoustics (LAB), Rambla Exposició, 24, 08800 Vilanova i la Geltru, Barcelona, Spain
| | - A M Sánchez
- Technical University of Catalonia, BarcelonaTech (UPC), Laboratory of Applied Bioacoustics (LAB), Rambla Exposició, 24, 08800 Vilanova i la Geltru, Barcelona, Spain
| | - J V Castell
- Technical University of Catalonia, BarcelonaTech (UPC), Laboratory of Applied Bioacoustics (LAB), Rambla Exposició, 24, 08800 Vilanova i la Geltru, Barcelona, Spain
| | - M Solé
- Technical University of Catalonia, BarcelonaTech (UPC), Laboratory of Applied Bioacoustics (LAB), Rambla Exposició, 24, 08800 Vilanova i la Geltru, Barcelona, Spain
| | - F Vila
- Technical University of Catalonia, BarcelonaTech (UPC), Laboratory of Applied Bioacoustics (LAB), Rambla Exposició, 24, 08800 Vilanova i la Geltru, Barcelona, Spain
| | - D Djokic
- Technical University of Catalonia, BarcelonaTech (UPC), Laboratory of Applied Bioacoustics (LAB), Rambla Exposició, 24, 08800 Vilanova i la Geltru, Barcelona, Spain
| | - S Adrián-Martínez
- Institut d'Investigació per a la Gestió Integrada de les Zones Costaneres (IGIC) - Universitat Politècnica de Valencia, C/Paranimf 1, 46730 Gandia, Spain
| | - A Albert
- GRPHE - Université de Haute Alsace - Institut universitaire de technologie de Colmar, 34 rue du Grillenbreit BP 50568 - 68008, Colmar, France
| | - M Anghinolfi
- INFN - Sezione di Genova, Via Dodecaneso 33, 16146 Genova, Italy
| | - G Anton
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - M Ardid
- Institut d'Investigació per a la Gestió Integrada de les Zones Costaneres (IGIC) - Universitat Politècnica de Valencia, C/Paranimf 1, 46730 Gandia, Spain
| | - J-J Aubert
- Aix-Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France
| | - T Avgitas
- APC, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, 75205 Paris, France
| | - B Baret
- APC, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, 75205 Paris, France
| | - J Barrios-Martí
- IFIC - Institut de Física Corpuscular (CSIC - Universitat de València) c/Catedrático José Beltran, 2 E-46980 Paterna, Valencia, Spain
| | - S Basa
- LAM - Laboratoire d'Astrophysique de Marseille, Pôle de l'Etoile Site de Château-Gombert, rue Frédéric Joliot-Curie 38, 13388 Marseille Cédex 13, France
| | - V Bertin
- Aix-Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France
| | - S Biagi
- INFN - Laboratori Nazionali del Sud (LNS), Via S. So a 62, 95123 Catania, Italy
| | - R Bormuth
- Nikhef, Science Park, Amsterdam, The Netherlands.,Huygens-Kamerlingh Onnes Laboratorium, Universiteit Leiden, The Netherlands
| | - M C Bouwhuis
- Nikhef, Science Park, Amsterdam, The Netherlands
| | - R Bruijn
- Nikhef, Science Park, Amsterdam, The Netherlands.,Universiteit van Amsterdam, Instituut voor Hoge-Energie Fysica, Science Park 105, 1098 XG Amsterdam, The Netherlands
| | - J Brunner
- Aix-Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France
| | - J Busto
- Aix-Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France
| | - A Capone
- INFN -Sezione di Roma, P.le Aldo Moro 2, 00185 Roma, Italy.,Dipartimento di Fisica dell'Universita La Sapienza, P.le Aldo Moro 2, 00185 Roma, Italy
| | - L Caramete
- Institute for Space Science, RO-077125 Bucharest, Magurele, Romania
| | - J Carr
- Aix-Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France
| | - S Celli
- INFN -Sezione di Roma, P.le Aldo Moro 2, 00185 Roma, Italy.,Dipartimento di Fisica dell'Universita La Sapienza, P.le Aldo Moro 2, 00185 Roma, Italy
| | - T Chiarusi
- INFN - Sezione di Bologna, Viale Berti-Pichat 6/2, 40127 Bologna, Italy
| | - M Circella
- INFN - Sezione di Bari, Via E. Orabona 4, 70126 Bari, Italy
| | - A Coleiro
- APC, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, 75205 Paris, France
| | - R Coniglione
- INFN - Laboratori Nazionali del Sud (LNS), Via S. So a 62, 95123 Catania, Italy
| | - H Costantini
- Aix-Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France
| | - P Coyle
- Aix-Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France
| | - A Creusot
- APC, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, 75205 Paris, France
| | - A Deschamps
- Geoazur, UCA, CNRS, IRD, Observatoire de la Côte d'Azur, Sophia Antipolis, France
| | - G De Bonis
- INFN -Sezione di Roma, P.le Aldo Moro 2, 00185 Roma, Italy.,Dipartimento di Fisica dell'Universita La Sapienza, P.le Aldo Moro 2, 00185 Roma, Italy
| | - C Distefano
- INFN - Laboratori Nazionali del Sud (LNS), Via S. So a 62, 95123 Catania, Italy
| | - I Di Palma
- INFN -Sezione di Roma, P.le Aldo Moro 2, 00185 Roma, Italy.,Dipartimento di Fisica dell'Universita La Sapienza, P.le Aldo Moro 2, 00185 Roma, Italy
| | - C Donzaud
- APC, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, 75205 Paris, France.,Univ. Paris-Sud, 91405 Orsay Cedex, France
| | - D Dornic
- Aix-Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France
| | - D Drouhin
- GRPHE - Université de Haute Alsace - Institut universitaire de technologie de Colmar, 34 rue du Grillenbreit BP 50568 - 68008, Colmar, France
| | - T Eberl
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - I El Bojaddaini
- University Mohammed I, Laboratory of Physics of Matter and Radiations, B.P.717, Oujda 6000, Morocco
| | - D Elsässer
- Institut für Theoretische Physik und Astrophysik, Universität Wärzburg, Emil-Fischer Str. 31, 97074 Würzburg, Germany
| | - A Enzenhöfer
- Aix-Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France
| | - K Fehn
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - I Felis
- Institut d'Investigació per a la Gestió Integrada de les Zones Costaneres (IGIC) - Universitat Politècnica de Valencia, C/Paranimf 1, 46730 Gandia, Spain
| | - L A Fusco
- INFN - Sezione di Bologna, Viale Berti-Pichat 6/2, 40127 Bologna, Italy.,Dipartimento di Fisica e Astronomia dell'Universita, Viale Berti Pichat 6/2, 40127 Bologna, Italy
| | - S Galatà
- APC, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, 75205 Paris, France
| | - P Gay
- APC, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, 75205 Paris, France.,Laboratoire de Physique Corpusculaire, Clermont Université, Université Blaise Pascal, CNRS/IN2P3, BP 10448, F-63000 Clermont-Ferrand, France
| | - S Geißelsöder
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - K Geyer
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - V Giordano
- INFN - Sezione di Catania, Viale Andrea Doria 6, 95125 Catania, Italy
| | - A Gleixner
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - H Glotin
- LSIS, Aix Marseille Université CNRS ENSAM LSIS UMR 7296 13397 Marseille, France.,Université de Toulon CNRS LSIS UMR 7296 83957 La Garde, France.,Institut universitaire de France, 75005 Paris, France
| | - R Gracia-Ruiz
- APC, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, 75205 Paris, France
| | - K Graf
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - S Hallmann
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - H van Haren
- Royal Netherlands Institute for Sea Research (NIOZ), Landsdiep 4, 1797 SZ 't Horntje (Texel), The Netherlands
| | - A J Heijboer
- Nikhef, Science Park, Amsterdam, The Netherlands
| | - Y Hello
- Geoazur, UCA, CNRS, IRD, Observatoire de la Côte d'Azur, Sophia Antipolis, France
| | - J J Hernandez-Rey
- IFIC - Institut de Física Corpuscular (CSIC - Universitat de València) c/Catedrático José Beltran, 2 E-46980 Paterna, Valencia, Spain
| | - J Hößl
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - J Hofestädt
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - C Hugon
- INFN - Sezione di Genova, Via Dodecaneso 33, 16146 Genova, Italy.,Dipartimento di Fisica dell'Universita, Via Dodecaneso 33, 16146 Genova, Italy
| | - G Illuminati
- IFIC - Institut de Física Corpuscular (CSIC - Universitat de València) c/Catedrático José Beltran, 2 E-46980 Paterna, Valencia, Spain.,INFN -Sezione di Roma, P.le Aldo Moro 2, 00185 Roma, Italy.,Dipartimento di Fisica dell'Universita La Sapienza, P.le Aldo Moro 2, 00185 Roma, Italy
| | - C W James
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - M de Jong
- Nikhef, Science Park, Amsterdam, The Netherlands.,Huygens-Kamerlingh Onnes Laboratorium, Universiteit Leiden, The Netherlands
| | - M Jongen
- Nikhef, Science Park, Amsterdam, The Netherlands
| | - M Kadler
- Institut für Theoretische Physik und Astrophysik, Universität Wärzburg, Emil-Fischer Str. 31, 97074 Würzburg, Germany
| | - O Kalekin
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - U Katz
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - D Kießling
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - A Kouchner
- APC, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, 75205 Paris, France.,LSIS, Aix Marseille Université CNRS ENSAM LSIS UMR 7296 13397 Marseille, France.,Université de Toulon CNRS LSIS UMR 7296 83957 La Garde, France.,Institut universitaire de France, 75005 Paris, France
| | - M Kreter
- Institut für Theoretische Physik und Astrophysik, Universität Wärzburg, Emil-Fischer Str. 31, 97074 Würzburg, Germany
| | - I Kreykenbohm
- Dr. Remeis-Sternwarte and ECAP, Universitat Erlangen-Nurnberg, Sternwartstr. 7, 96049 Bamberg, Germany
| | - V Kulikovskiy
- INFN - Laboratori Nazionali del Sud (LNS), Via S. So a 62, 95123 Catania, Italy.,Moscow State University, Skobeltsyn Institute of Nuclear Physics, Leninskie gory, 119991 Moscow, Russia
| | - C Lachaud
- APC, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, 75205 Paris, France
| | - R Lahmann
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - D Lefèvre
- Mediterranean Institute of Oceanography (MIO), Aix-Marseille University, 13288, Marseille, Cédex 9, France.,Université du Sud Toulon-Var, 83957 CNRS-INSU/IRD UM 110, La Garde Cédex, France
| | - E Leonora
- INFN - Sezione di Catania, Viale Andrea Doria 6, 95125 Catania, Italy.,Dipartimento di Fisica ed Astronomia dell'Universita, Viale Andrea Doria 6, 95125 Catania, Italy
| | - S Loucatos
- APC, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, 75205 Paris, France.,Direction des Sciences de la Matière - Institut de recherche sur les lois fondamentales de l'Univers - Service de Physique des Particules, CEA Saclay, 91191 Gif-sur-Yvette Cédex, France
| | - M Marcelin
- LAM - Laboratoire d'Astrophysique de Marseille, Pôle de l'Etoile Site de Château-Gombert, rue Frédéric Joliot-Curie 38, 13388 Marseille Cédex 13, France
| | - A Margiotta
- INFN - Sezione di Bologna, Viale Berti-Pichat 6/2, 40127 Bologna, Italy.,Dipartimento di Fisica e Astronomia dell'Universita, Viale Berti Pichat 6/2, 40127 Bologna, Italy
| | - A Marinelli
- INFN - Sezione di Pisa, Largo B. Pontecorvo 3, 56127 Pisa, Italy.,Dipartimento di Fisica dell'Universita, Largo B. Pontecorvo 3, 56127 Pisa, Italy
| | - J A Martínez-Mora
- Institut d'Investigació per a la Gestió Integrada de les Zones Costaneres (IGIC) - Universitat Politècnica de Valencia, C/Paranimf 1, 46730 Gandia, Spain
| | - A Mathieu
- Aix-Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France
| | - K Melis
- Nikhef, Science Park, Amsterdam, The Netherlands.,Universiteit van Amsterdam, Instituut voor Hoge-Energie Fysica, Science Park 105, 1098 XG Amsterdam, The Netherlands
| | - T Michael
- Nikhef, Science Park, Amsterdam, The Netherlands
| | - P Migliozzi
- INFN -Sezione di Napoli, Via Cintia 80126 Napoli, Italy
| | - A Moussa
- University Mohammed I, Laboratory of Physics of Matter and Radiations, B.P.717, Oujda 6000, Morocco
| | - C Mueller
- Institut für Theoretische Physik und Astrophysik, Universität Wärzburg, Emil-Fischer Str. 31, 97074 Würzburg, Germany
| | - E Nezri
- LAM - Laboratoire d'Astrophysique de Marseille, Pôle de l'Etoile Site de Château-Gombert, rue Frédéric Joliot-Curie 38, 13388 Marseille Cédex 13, France
| | - G E Păvălaş
- Institute for Space Science, RO-077125 Bucharest, Magurele, Romania
| | - C Pellegrino
- INFN - Sezione di Bologna, Viale Berti-Pichat 6/2, 40127 Bologna, Italy.,Dipartimento di Fisica e Astronomia dell'Universita, Viale Berti Pichat 6/2, 40127 Bologna, Italy
| | - C Perrina
- INFN -Sezione di Roma, P.le Aldo Moro 2, 00185 Roma, Italy.,Dipartimento di Fisica dell'Universita La Sapienza, P.le Aldo Moro 2, 00185 Roma, Italy
| | - P Piattelli
- INFN - Laboratori Nazionali del Sud (LNS), Via S. So a 62, 95123 Catania, Italy
| | - V Popa
- Institute for Space Science, RO-077125 Bucharest, Magurele, Romania
| | - T Pradier
- Université de Strasbourg, IPHC, 23 rue du Loess 67037 Strasbourg, France.,CNRS, UMR7178, 67037 Strasbourg, France
| | - C Racca
- GRPHE - Université de Haute Alsace - Institut universitaire de technologie de Colmar, 34 rue du Grillenbreit BP 50568 - 68008, Colmar, France
| | - G Riccobene
- INFN - Laboratori Nazionali del Sud (LNS), Via S. So a 62, 95123 Catania, Italy
| | - K Roensch
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - M Saldaña
- Institut d'Investigació per a la Gestió Integrada de les Zones Costaneres (IGIC) - Universitat Politècnica de Valencia, C/Paranimf 1, 46730 Gandia, Spain
| | - D F E Samtleben
- Nikhef, Science Park, Amsterdam, The Netherlands.,Huygens-Kamerlingh Onnes Laboratorium, Universiteit Leiden, The Netherlands
| | - M Sanguineti
- INFN - Sezione di Genova, Via Dodecaneso 33, 16146 Genova, Italy.,Dipartimento di Fisica dell'Universita, Via Dodecaneso 33, 16146 Genova, Italy
| | - P Sapienza
- INFN - Laboratori Nazionali del Sud (LNS), Via S. So a 62, 95123 Catania, Italy
| | - J Schnabel
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - F Schüssler
- Direction des Sciences de la Matière - Institut de recherche sur les lois fondamentales de l'Univers - Service de Physique des Particules, CEA Saclay, 91191 Gif-sur-Yvette Cédex, France
| | - T Seitz
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - C Sieger
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - M Spurio
- INFN - Sezione di Bologna, Viale Berti-Pichat 6/2, 40127 Bologna, Italy.,Dipartimento di Fisica e Astronomia dell'Universita, Viale Berti Pichat 6/2, 40127 Bologna, Italy
| | - Th Stolarczyk
- Direction des Sciences de la Matière - Institut de recherche sur les lois fondamentales de l'Univers - Service de Physique des Particules, CEA Saclay, 91191 Gif-sur-Yvette Cédex, France
| | - A Sánchez-Losa
- INFN - Laboratori Nazionali del Sud (LNS), Via S. So a 62, 95123 Catania, Italy.,INFN - Sezione di Bari, Via E. Orabona 4, 70126 Bari, Italy
| | - M Taiuti
- INFN - Sezione di Genova, Via Dodecaneso 33, 16146 Genova, Italy.,Dipartimento di Fisica dell'Universita, Via Dodecaneso 33, 16146 Genova, Italy
| | - A Trovato
- INFN - Laboratori Nazionali del Sud (LNS), Via S. So a 62, 95123 Catania, Italy
| | - M Tselengidou
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - D Turpin
- Aix-Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France
| | - C Tönnis
- IFIC - Institut de Física Corpuscular (CSIC - Universitat de València) c/Catedrático José Beltran, 2 E-46980 Paterna, Valencia, Spain
| | - B Vallage
- Technical University of Catalonia, BarcelonaTech (UPC), Laboratory of Applied Bioacoustics (LAB), Rambla Exposició, 24, 08800 Vilanova i la Geltru, Barcelona, Spain.,Direction des Sciences de la Matière - Institut de recherche sur les lois fondamentales de l'Univers - Service de Physique des Particules, CEA Saclay, 91191 Gif-sur-Yvette Cédex, France
| | - C Vallée
- Aix-Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France
| | - V Van Elewyck
- APC, Université Paris Diderot, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris, Sorbonne Paris Cité, 75205 Paris, France
| | - D Vivolo
- INFN -Sezione di Napoli, Via Cintia 80126 Napoli, Italy.,Dipartimento di Fisica dell'Universita Federico II di Napoli, Via Cintia 80126, Napoli, Italy
| | - S Wagner
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
| | - J Wilms
- Dr. Remeis-Sternwarte and ECAP, Universitat Erlangen-Nurnberg, Sternwartstr. 7, 96049 Bamberg, Germany
| | - J D Zornoza
- IFIC - Institut de Física Corpuscular (CSIC - Universitat de València) c/Catedrático José Beltran, 2 E-46980 Paterna, Valencia, Spain
| | - J Zuñiga
- IFIC - Institut de Física Corpuscular (CSIC - Universitat de València) c/Catedrático José Beltran, 2 E-46980 Paterna, Valencia, Spain
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Pareja E, Gomez-Lechon MJ, Cortes M, Bonora-Centelles A, Castell JV, Mir J. Human hepatocyte transplantation in patients with hepatic failure awaiting a graft. ACTA ACUST UNITED AC 2013; 50:273-81. [PMID: 23796722 DOI: 10.1159/000351332] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2012] [Accepted: 03/11/2013] [Indexed: 12/20/2022]
Abstract
BACKGROUND Hepatocyte transplantation (HT) has the potential to become a promising treatment to temporarily support liver function in patients with liver failure. METHODS Two patients, who had already received a liver transplant (LT) in the past, with an end-stage liver disease due to recurrent hepatitis C virus cirrhosis, suffering acute-on-chronic liver failure while on the waiting list for an LT, received HT as a bridge to whole-organ retransplantation. After HT and during intensive care unit admission, blood tests and ammonia levels were determined every 12 and 24 h, respectively, before and after each hepatocyte infusion. RESULTS The present study describes monitoring of analytical and clinical parameters and improvement of liver function following HT. In both patients, we managed to lower the blood ammonia levels and clinically improve the degree of hepatic encephalopathy, thus serving as a bridge to liver retransplantation in 1 patient. CONCLUSIONS We believe that this therapy may be an alternative treatment in patients with chronic liver disease who suffer episodes of acute decompensation as a bridge to conventional LT.
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Affiliation(s)
- E Pareja
- Unidad de Cirugía y Trasplante Hepático y Pancreático, Hospital Universitari i Politècnic La Fe de Valencia, Universidad de Valencia, Valencia, Spain.
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Ponsoda X, Jover R, Núñez C, Royo M, Castell JV, Gómez-Lechón MJ. Evaluation of the cytotoxicity of 10 chemicals in human and rat hepatocytes and in cell lines: Correlation between in vitro data and human lethal concentration. Toxicol In Vitro 2012; 9:959-66. [PMID: 20650174 DOI: 10.1016/0887-2333(95)00053-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/13/1995] [Indexed: 12/21/2022]
Abstract
The cytotoxicity of 10 chemicals from the Multicentre Evaluation of In vitro Cytotoxicity (MEIC) list (nos 21-30) was evaluated in human and rat cultured hepatocytes and in two established cell lines (HepG2 and 3T3) according to the MEIC programme organized by the Scandinavian Society of Cell Toxicology. The MTT test was used as the endpoint of cytotoxicity after 24hr of exposure to the chemicals. Theophylline, phenobarbital and paraquat were the least cytotoxic compounds in the cellular systems (IC(50) = 450-17,000 mum) except for the 3T3 cells. The seven remaining chemicals (dextropropoxyphene, propranolol, arsenic trioxide, cupric sulfate, mercuric chloride, thioridazine and thallium sulfate) showed a similar relative cytotoxic ranking in the four in vitro systems in the lower range of concentrations (IC(50) = 2-350 mum). The data suggest that these 10 chemicals have a basal cytotoxic effect common to the four in vitro systems, and probably none of these compounds could be considered either hepatotoxic or species specific. The correlation between in vitro data and human lethal blood concentrations showed that the predictability of the in vitro systems was similar to that of in vivo rodent tests (LD(50)) only when low cytotoxic concentrations (IC(10)) were used for correlation.
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Affiliation(s)
- X Ponsoda
- Unidad de Hepatología Experimental, Centro de Investigatión, Hospital Universitario "La Fe", SVS. Avda. Campanar 21, E-46009 Valencia, Spain
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André M, van der Schaar M, Zaugg S, Houégnigan L, Sánchez AM, Castell JV. Listening to the Deep: live monitoring of ocean noise and cetacean acoustic signals. Mar Pollut Bull 2011; 63:18-26. [PMID: 21665016 DOI: 10.1016/j.marpolbul.2011.04.038] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2009] [Revised: 04/02/2011] [Accepted: 04/09/2011] [Indexed: 05/30/2023]
Abstract
The development and broad use of passive acoustic monitoring techniques have the potential to help assessing the large-scale influence of artificial noise on marine organisms and ecosystems. Deep-sea observatories have the potential to play a key role in understanding these recent acoustic changes. LIDO (Listening to the Deep Ocean Environment) is an international project that is allowing the real-time long-term monitoring of marine ambient noise as well as marine mammal sounds at cabled and standalone observatories. Here, we present the overall development of the project and the use of passive acoustic monitoring (PAM) techniques to provide the scientific community with real-time data at large spatial and temporal scales. Special attention is given to the extraction and identification of high frequency cetacean echolocation signals given the relevance of detecting target species, e.g. beaked whales, in mitigation processes, e.g. during military exercises.
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Affiliation(s)
- M André
- Laboratori d'Aplicacions Bioacústiques, Universitat Politècnica de Catalunya (UPC), Centre Tecnològic de Vilanova i la Geltrú, Avda. Rambla Exposició, Barcelona, Spain.
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Gómez-Lechón MJ, Lahoz A, Gombau L, Castell JV, Donato MT. In vitro evaluation of potential hepatotoxicity induced by drugs. Curr Pharm Des 2010; 16:1963-77. [PMID: 20236064 DOI: 10.2174/138161210791208910] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Accepted: 03/11/2010] [Indexed: 11/22/2022]
Abstract
The liver is the most important target for toxicity caused by drugs. This vulnerability is a consequence of the functional features of the liver and their role in the metabolic elimination of most drugs. Therefore, evaluation of potential hepatotoxicity represents a critical step in the development of new drugs. The liver is very active in metabolising foreign compounds and, although biotransformation reactions generally parallel detoxification processes, the formation of reactive metabolites is relatively frequent. Thus, drug-induced hepatotoxicity can be due to the administered compound itself or to metabolites formed by hepatic metabolism. The most important systems to study hepatotoxicity and metabolic activity in vitro are liver slices, isolated liver cells in suspensions or in primary cultures including co-culture methods and special 3D techniques, various subcellular fractions and hepatic cell lines. These models can be used for cytotoxicity and genotoxicity screening, and also to identify the mechanisms involved in drug-induced hepatotoxicity. Assessment of current cytotoxicity and hepatic-specific biochemical effects are limited by the inability to measure a wide spectrum of potential mechanistic changes involved in the drug-induced toxic injury. A convenient selection of end-points allows a multiparametric evaluation of drug toxicity. In this regard, omic (cytomic, metabonomic, proteomic and toxicogemic) approaches help defining patterns of hepatotoxicity for early identification of potential adverse effects of the drug to the liver. The development of robust in vitro-based multiparametric screening assays covering a wider spectrum of key effects will heighten the predictive capacity for human hepatotoxicity, and accelerate the drug development process.
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Affiliation(s)
- M J Gómez-Lechón
- Unidad de Hepatología Experimental. Centro de Investigación, Hospital La Fe, Avda Campanar 21, 46009-Valencia, Spain.
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Bonora-Centelles A, Donato MT, Lahoz A, Pareja E, Mir J, Castell JV, Gómez-Lechón MJ. Functional characterization of hepatocytes for cell transplantation: customized cell preparation for each receptor. Cell Transplant 2010; 19:21-8. [PMID: 19796502 DOI: 10.3727/096368909x474267] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The first indication of hepatocyte transplantation is inborn liver-based metabolic disorders. Among these, urea cycle disorders leading to the impairment to detoxify ammonia and Crigler-Najjar Syndrome type I, a deficiency in the hepatic UDP-glucuronosyltransferase 1A1 present the highest incidence. Metabolically qualified human hepatocytes are required for clinical infusion. We proposed fast and sensitive procedures to determine their suitability for transplantation. For this purpose, viability, attachment efficiency, and metabolic functionality (ureogenic capability, cytochrome P450, and phase II activities) are assayed prior to clinical cell infusion to determine the quality of hepatocytes. Moreover, the evaluation of urea synthesis from ammonia and UDP-glucuronosyltransferase 1A1 activity, a newly developed assay using beta-estradiol as substrate, allows the possibility of customizing cell preparation for receptors with urea cycle disorders or Crigler-Najjar Syndrome type I. Sources of human liver and factors derived from the procurement of the liver sample (warm and cold ischemia) have also been investigated. The results show that grafts with a cold ischemia time exceeding 15 h and steatosis should not be accepted for hepatocyte transplantation. Finally, livers from non-heart-beating donors are apparently a potential suitable source of hepatocytes, which could enlarge the liver donor pool.
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Affiliation(s)
- A Bonora-Centelles
- Unidad de Hepatología Experimental, Centro de Investigación, Hospital La Fe, Valencia, Spain
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8
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Bonora-Centelles A, Jover R, Mirabet V, Lahoz A, Carbonell F, Castell JV, Gómez-Lechón MJ. Sequential hepatogenic transdifferentiation of adipose tissue-derived stem cells: relevance of different extracellular signaling molecules, transcription factors involved, and expression of new key marker genes. Cell Transplant 2009; 18:1319-40. [PMID: 19660180 DOI: 10.3727/096368909x12483162197321] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Adipose tissue contains a mesenchymal stem cell (MSC) population known as adipose-derived stem cells (ASCs) capable of differentiating into different cell types. Our aim was to induce hepatic transdifferentiation of ASCs by sequential exposure to several combinations of cytokines, growth factors, and hormones. The most efficient hepatogenic protocol includes fibroblastic growth factors (FGF) 2 and 4 and epidermal growth factor (EGF) (step 1), hepatocyte growth factor (HGF), FGF2, FGF4, and nicotinamide (Nic) (step 2), and oncostatin M (OSM), dexamethasone (Dex), and insulin-tranferrin-selenium (step 3). This protocol activated transcription factors [GATA6, Hex, CCAAT/enhancer binding protein alpha and beta (CEBPalpha and beta), peroxisome proliferator-activated receptor-gamma, coactivator 1 alpha (PGC1alpha), and hepatocyte nuclear factor 4 alpha (HNF4alpha)], which promoted a characteristic hepatic phenotype, as assessed by new informative markers for the step-by-step hepatic transdifferentiation of hMSC [early markers: albumin (ALB), alpha-2-macroglobuline (alpha2M), complement protein C3 (C3), and selenoprotein P1 (SEPP1); late markers: cytochrome P450 3A4 (CYP3A4), apolipoprotein E (APOE), acyl-CoA synthetase long-chain family member 1 (ACSL1), and angiotensin II receptor, type 1 (AGTR1)]. The loss of adipose adult stem cell phenotype was detected by losing expression of Thy1 and inhibitor of DNA binding 3 (Id3). The reexpression of phosphoenolpyruvate corboxykinase (PEPCK), apolipoprotein C3 (APOCIII), aldolase B (ALDOB), and cytochrome P450 1A2 (CYP1A2) was achieved by transduction with a recombinant adenovirus for HNF4alpha and finally hepatic functionality was also assessed by analyzing specific biochemical markers. We conclude that ASCs could represent an alternative tool in clinical therapy for liver dysfunction and regenerative medicine.
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Affiliation(s)
- A Bonora-Centelles
- Unidad de Hepatología Experimental, Centro de Investigación, Hospital La Fe, Valencia, Spain
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Lahoz A, Donato MT, Castell JV, Gómez-Lechón MJ. Strategies to in vitro assessment of major human CYP enzyme activities by using liquid chromatography tandem mass spectrometry. Curr Drug Metab 2008; 9:12-9. [PMID: 18220567 DOI: 10.2174/138920008783331112] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
At the early stage of drug discovery, thousands of new chemical entities (NCEs) may be screened before a single candidate can be identified for development. Determining the role of CYP enzymes in the metabolism of a compound and evaluating the effect of NCEs on human CYP activities are key issues in pharmaceutical development as they may explain inter-subject variability, drug-drug interactions, non-linear pharmacokinetics and toxic effects. Reliable methods for determining enzyme activities are needed to characterize an individual CYP enzyme and to obtain a tool for the evaluation of its role in drug metabolism in humans. Different liquid chromatography tandem mass spectrometry methodologies have been developed for the fast and routine analysis of major in vivo and in vitro CYPs enzyme activities. The high sensitivity and selectivity of mass spectrometry allow traditional assays to be minimized, thus saving time, efforts and money. Therefore this technology has become the method of choice for the fast assessment of CYP enzyme activities in early drug discovery development. Our intention herein is to review the most recent approaches that have been developed to quickly assess CYPs activities using in vitro models and liquid chromatography coupled with mass spectrometry, as well as their application in early drug discovery.
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Affiliation(s)
- A Lahoz
- Advancell, In Vitro Cell Technologies, Centro de investigación Hospital La Fe, Avda. Campanar 21, 46009-Valencia, and Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Universidad de Valencia, Spain.
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Olinga P, Elferink MGL, Draaisma AL, Merema MT, Castell JV, Pérez G, Groothuis GMM. Coordinated induction of drug transporters and phase I and II metabolism in human liver slices. Eur J Pharm Sci 2008; 33:380-9. [PMID: 18328680 DOI: 10.1016/j.ejps.2008.01.008] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2007] [Revised: 01/18/2008] [Accepted: 01/19/2008] [Indexed: 11/26/2022]
Abstract
Although regulation of phase I drug metabolism in human liver is relatively well studied, the regulation of phase II enzymes and of drug transporters is incompletely characterized. Therefore, we used human liver slices to investigate the PXR, CAR and AhR-mediated induction of drug transporters and phase I and II metabolic enzymes. Precision-cut human liver slices were incubated for 5 or 24h with prototypical inducers: phenobarbital (PB) (50 microM) for CAR, beta-naphthoflavone (BNF) (25 microM) for AhR, and rifampicin (RIF) (10 microM) for PXR, and gene expression of the phase I enzymes CYP1A1, 1A2, 3A4, 3A5, 2B6, 2A6, the phase II enzymes UGT1A1 and 1A6, and the transporters MRP2, MDR1, BSEP, NTCP and OATP8 was measured. BNF induced CYP1A1, UGT1A1 and UGT1A6 and MRP2, NTCP and MDR1. RIF induced CYP3A4, 3A5, 2B6, 2A6, UGT1A1, UGT1A6 and BSEP, MRP2 and MDR1 and slightly downregulated OATP8. PB induced CYP3A4, 3A5, 2B6 and 2A6, UGT1A1 and all transporters. Large interindividual differences were found with respect to the level of induction. Enzyme activity of CYP3A4, measured by testosterone metabolism, was increased after 24h by RIF. 7-Ethoxycoumarin O-deethylation activity, mediated predominantly by CYP 1A1/1A2 but also by other CYPs, was increased after 24h with PB. We have shown that regulation of all phases of the (in)activation of a drug via the CAR, AhR and the PXR pathways can be studied in human liver slices. The concomitant induction of metabolic enzymes and transporters shows that also in the human liver transporters and metabolic enzymes are regulated coordinately.
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Affiliation(s)
- P Olinga
- Department of Pharmacokinetics and Drug Delivery, Groningen Research Institute for Pharmacy, University of Groningen, Ant. Deusinglaan 1, 9713 AV Groningen, The Netherlands.
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Lahoz A, Donato MT, Picazo L, Gómez-Lechón MJ, Castell JV. Determination of major human cytochrome P450s activities in 96-well plates using liquid chromatography tandem mass spectrometry. Toxicol In Vitro 2007; 21:1247-52. [PMID: 17521862 DOI: 10.1016/j.tiv.2007.03.022] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2006] [Revised: 02/20/2007] [Accepted: 03/25/2007] [Indexed: 11/18/2022]
Abstract
At the early stage of drug discovery, thousands of new chemical entities (NCEs) may be screened before a single candidate can be identified for development. Evaluation of the effect of NCEs on human CYP450 enzyme activities is a key issue in pharmaceutical development as it may explain inter-subject variability, drug-drug interactions, non-linear pharmacokinetics and toxic effects. A liquid chromatography tandem mass spectrometry (HPLC-MS/MS) method has been developed for the fast and routine analysis of major human CYP450s enzyme activities (CYP1A2, CYP2A6, CYP2B6, CYP2C9, CYP2C19, CYP2D6, CYP2E1 and CYP3A4) in primary hepatocyte cell cultures. The high sensitivity and selectivity of mass spectrometry has allowed traditional assays to be minimized, thus enabling the use of 96-well plate format which markedly reduced the number of hepatocytes needed for each cytochrome CYP450 activity measurement, a fact that is particularly critical concerning human hepatocytes.
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Affiliation(s)
- A Lahoz
- Advancell, In Vitro Cell Technologies, Centro de Investigación, Avda. Campanar 21, Hospital La Fe 46009-Valencia, Spain.
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Agapakis-Caussé C, Boscá F, Castell JV, Hernández D, Marín ML, Marrot L, Miranda MA. Tiaprofenic Acid-photosensitized Damage to Nucleic Acids: A Mechanistic Study Using Complementary in vitro Approaches. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2000)0710499tapdtn2.0.co2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Taléns-Visconti R, Bonora A, Jover R, Mirabet V, Carbonell F, Castell JV, Gómez-Lechón MJ. Human mesenchymal stem cells from adipose tissue: Differentiation into hepatic lineage. Toxicol In Vitro 2006; 21:324-9. [PMID: 17045453 DOI: 10.1016/j.tiv.2006.08.009] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2006] [Revised: 07/07/2006] [Accepted: 08/30/2006] [Indexed: 12/15/2022]
Abstract
Adipose tissue represents an accessible source of mesenchymal stem cells (ADSCs), with similar characteristics to bone marrow-derived stem cells. The aim of this work was to investigate the transdifferentiation of ADSCs into hepatic lineage cells in vitro. ADSCs were obtained from human adipose tissue from lipectomy. Cells were grown in medium containing 15% AB human serum. Cultures were serum deprived for two days and exposed to a two-step protocol with two different media using growth factors and cytokines. Hepatic differentiation was assessed by RT-PCR of liver-marker genes. ADSCs exhibited a fibroblastic morphology that changed to a cuboidal shape when cells differentiated. Expression of liver genes increased when using one of the two studied media consisting of DMEM supplemented with HGF, bFGF and nicotinamide for 14 days. The results indicate that, under certain specific inducing conditions, ADSCs can be induced to differentiate into hepatic lineage in vitro. Adipose tissue may be an ideal source of high amounts of autologous stem cells.
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Abstract
The study of the ADME features of the huge number of new chemical entities (NCEs) produced mainly by combinatorial chemistry has become a bottleneck in the drug development process. In response the pharmaceutical industry is involved in the development of new medium/high-throughput screening capabilities. The aim of this paper is to review some of the available in vitro ADME systems adapted to screening requirements together with the technological approaches which can be linked to medium/high-throughput molecular screening.
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Affiliation(s)
- A Lahoz
- Unidad de Hepatología Experimental. Centro de Investigación, Hospital La Fe, Avda. Campanar 21, 46009-Valencia, Spain
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Donato MT, Jiménez N, Serralta A, Mir J, Castell JV, Gómez-Lechón MJ. Effects of steatosis on drug-metabolizing capability of primary human hepatocytes. Toxicol In Vitro 2006; 21:271-6. [PMID: 16950596 DOI: 10.1016/j.tiv.2006.07.008] [Citation(s) in RCA: 35] [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] [Received: 03/30/2006] [Revised: 07/14/2006] [Accepted: 07/18/2006] [Indexed: 12/12/2022]
Abstract
The suitability of liver grafts discarded for transplantation because of macrosteatosis for preparing human hepatocyte cultures for in vitro drug metabolism studies has been examined. Lower cell viability and yield of isolation procedure were obtained from fatty livers (>40% steatosis) with respect to normal tissue. Significant reductions in 7-ethoxycoumarin O-deethylation (ECOD) and testosterone oxidations were found in hepatocytes prepared from steatotic livers. The potential impact of lipid accumulation on P450 enzymes was studied in vitro by incubation of cultured hepatocytes with long chain free fatty acids (FFA). Treatment of cells with 0.25-3mM FFA induced dose-dependent accumulation of lipids in the cytosol. Decreased ECOD and testosterone oxidation were found after 14h of exposure to 1mM or 2mM FFA (about 60-70% and 30-60% of control, respectively). The effects of fat-overloading on individual P450s were analyzed both at activity and mRNA level. CYP1A2, CYP2C9, CYP2E1 and CYP3A4 activities were reduced after hepatocyte incubation with 1mM (to 45-65% of control) or 2mM (to 20-50%) FFA for 14h. Reductions in P450 transcripts were also found in hepatocytes treated with 1mM FFA. Our findings showed a general down-regulation of P450s involved in drug metabolism in fat-overloaded hepatocytes. The results suggest that, despite their reduced P450 function, human hepatocytes obtained from donors with steatosis are metabolically competent and could be used for drug metabolism studies.
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Affiliation(s)
- M T Donato
- Departamento de Bioquímica y Biología Molecular, Universidad de Valencia, Spain.
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Gombau L, García F, Lahoz A, Fabre M, Roda-Navarro P, Majano P, Alonso-Lebrero JL, Pivel JP, Castell JV, Gómez-Lechon MJ, González S. Polypodium leucotomos extract: antioxidant activity and disposition. Toxicol In Vitro 2005; 20:464-71. [PMID: 16263237 DOI: 10.1016/j.tiv.2005.09.008] [Citation(s) in RCA: 45] [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] [Received: 04/12/2005] [Revised: 09/08/2005] [Accepted: 09/19/2005] [Indexed: 10/25/2022]
Abstract
The extract of the fern Polypodium leucotomos (PL, Fernblock) is an oral photoprotectant with strong antioxidative properties. Recent studies to determine its chemical composition have shown 4-hydroxycinnamic acid (p-coumaric), 3 methoxy-4-hydroxycinnamic acid (ferulic), 3,4-dihydroxycinnamic acid (caffeic), 3-methoxy-4-hydroxybenzoic acid (vanillic) and 3-caffeoilquinic acid (chlorogenic) to be among its major phenolic components. No conclusive data are available, however, on the H2O2-scavenging capacity of these compounds, or on their absorption and metabolism following their oral intake. In the present work, their antioxidative capacity was assessed by the luminol/H2O2 assay, their absorption studied using Caco-2 cells to resemble the intestinal barrier, and their metabolism investigated using cultured primary rat hepatocytes. The antioxidant capacity of PL components increased in a concentration-dependent manner, with ferulic and caffeic acids the most powerful antioxidants. The apparent permeability results correspond to a human post-oral administration absorption of 70-100% for all tested substances. Coumaric, ferulic and vanillic acids were metabolized by CYP450-dependent mono-oxygenases and partially conjugated to glucuronic acid and sulfate. These phenolic compounds may contribute to the health benefits afforded by this oral photoprotectant.
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Affiliation(s)
- L Gombau
- Advancell, 46009 Valencia, Spain
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Gómez-Lechón MJ, Serralta A, Donato MT, Jiménez N, O'connor E, Castell JV, Mir J. The immunosuppressant drug FK506 prevents Fas-induced apoptosis in human hepatocytes. Biochem Pharmacol 2005; 68:2427-33. [PMID: 15548389 DOI: 10.1016/j.bcp.2004.08.028] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2004] [Accepted: 08/30/2004] [Indexed: 11/21/2022]
Abstract
FK506 is a potent immunosuppressive drug used for the prevention of graft rejection in organ transplantation. Experimental and clinical studies have shown correlations between apoptosis and graft rejection, and apoptosis also plays a role in cell death after ischemia-reperfusion injury in the rat liver. Fas-mediated apoptosis is very likely involved in allograft rejection and experimental evidence has shown a decrease of FasR expression in mouse hepatocytes produced by the drugs. On the basis of these findings we have investigated the protective effect of FK506 in comparison with cyclosporine A (CsA) on Fas-induced apoptosis, by analysing the activation of downstream effector caspases in human hepatocytes. Apoptosis was induced by treatment with agonistic antibodies against FasR, which resulted in a significant activation of caspase-3 after 12 h. Prevention of the downstream activation of the caspase cascade and apoptosis was observed when hepatocytes were pre-treated for 3 h with immunosuppressant drugs. A significant reduction (ca. 30-40%) of caspase-3 activation by 5 microM FK506 and CsA was observed. Along with less activation of caspase-3 a decrease of apoptotic DNA fragmentation was found. In addition, FK506 significantly reduced not only caspase-8 but also caspase-9 activation, to a similar extent as CsA, thus suggesting a protective effect at the mitochondrial level of this drug, as has already been reported for CsA. These effects of FK506 help to explain its strong anti-rejection properties and suggest promising benefits of pharmacological preconditioning on ischemia-reperfusion injury following liver transplantation.
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Affiliation(s)
- M J Gómez-Lechón
- Centro de Investigación, Unidad de Hepatología Experimental, Hospital Universitario La Fe, Avda Campanar 21, E-47009 Valencia, Spain.
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Abstract
Different types of hepatic tissue, including whole or split livers from organ donors or waste liver from therapeutic liver resections, are used to prepare human hepatocyte cultures. Characteristics of liver samples from different origins (gender, age, healthy/pathological status, xenobiotic treatment) as sources of human hepatocytes are key factors which notably determine viability and functionality of hepatocytes. The characterisation of the CYP system can be assessed in terms of activity (using specific substrates/inhibitors), protein (antibody analysis) and molecular biology-based mRNA amplification techniques (PCR technology and DNA microarrays). It could reasonably be considered that human hepatocytes reflect the heterogeneity of CYP expression in human liver and is a suitable model for drug metabolism studies. Several key issues need to be addressed at the early stages of drug development to better select drug candidates (metabolic profile and rate, identification of CYPs involved, drug-drug interactions due to enzyme induction/inhibition). The metabolic stability and metabolite profile of new chemicals can be easily investigated by incubating the drugs with fully competent metabolic models like hepatocyte suspensions or 24 h-cultured hepatocytes. CYP inhibitory effects are usually screened in recombinant CYP enzymes or microsomes, however, the actual concentration of substrate and inhibitor available to the CYP enzyme depends on processes missing in subcellular models (transport mechanisms, cytosolic enzymes, binding to intracellular proteins). Since intact cells more closely reflect the environment to which drugs are exposed in the liver, cultured hepatocytes constitute a more predictive model for drug-drug interactions. Screening of CYP inducers cannot be done in microsomes as it requires a cellular system fully capable of expressing CYP genes. Primary hepatocytes are still the unique in vitro model for global examination of inductive potential of drugs (monitored as increases in mRNA content or activity).
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Affiliation(s)
- M J Gómez-Lechón
- Centro de Investigación, Hospital La Fe, Avda Campanar 21, 46009-Valencia, Spain.
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19
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Serralta A, Donato MT, Orbis F, Castell JV, Mir J, Gómez-Lechón MJ. Functionality of cultured human hepatocytes from elective samples, cadaveric grafts and hepatectomies. Toxicol In Vitro 2004; 17:769-74. [PMID: 14599475 DOI: 10.1016/s0887-2333(03)00122-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [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: 01/10/2023]
Abstract
The major possible sources of human liver for hepatocyte isolation are elective liver biopsies, cadaveric liver grafts and therapeutic liver resections. The suitability in terms of metabolic-competent hepatocyte cultures and risk/benefit of these resources has been comparatively studied. To this end, viability of isolated hepatocytes, yield of isolation procedure, hepatocyte survival during culture and CYP activities were the parameters analysed. The best results were found in hepatocytes prepared from elective biopsies, whereas a marked reduction in viability and functional competence was seen in hepatocytes from hepatectomy samples. Metabolic differences were observed in total CYP oxidative metabolism (7-ethoxycoumarin O-deethylation, total testosterone hydroxylation), as well as in CYP3A4, CYP2C9 or CYP2C19 activities (testosterone oxidations at 6beta-, 16beta- and 17-positions, respectively). Vascular control during the hepatectomy procedure influenced hepatocyte functionality: higher CYP activities were found in hepatocytes isolated from samples obtained under non-ischemic conditions or continuous vascular clamping than in those obtained under intermittent vascular clamping. In addition to cellular functionality, other criteria such as sample availability or ethical aspects should be considered. Elective biopsies have low, but not absent, surgical risk. However, the better functionality and the higher accessibility of elective liver samples in comparison to the other groups suggest this source of liver tissue as the most appropriate for cell harvesting purposes.
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Affiliation(s)
- A Serralta
- Unidad de Cirugía y Trasplante Hepático, Hospital Universitario La Fe, Avda Campanar 21, 46009, Valencia, Spain
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20
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Abstract
The possible stereoselectivity in DNA-photosensitization by carprofen (a NSAID drug) and ofloxacin (a fluoroquinolone agent) was investigated. The different drug stereoisomers or racemic mixtures were UVA-irradiated and the relaxation of the supercoiled circular pBR322 quantified by electrophoresis. Formation of single strand breaks was compared for each group of compounds. Moreover a mechanistic study by means of repair enzymes: T4 endonuclease V (specific of cyclobutane pyrimidine dimers), E. coli endonuclease III (revealing oxidized pyrimidines) and E. coli Formamidopyrimidine-DNA glycosylase (revealing oxidized purines) provided further insights into a possible stereoselectivity of the different reaction pathways in drug photosensitized-DNA damage. Ofloxacin and levofloxacin (its S stereoisomer) were responsible of single strand breaks formation as well as oxidation of pyrimidine and purine bases. No pyrimidine dimers were observed. Racemic, R and S stereoisomers of carprofen were less efficient than ofloxacin in DNA single strand breaks formation and did not induce enzyme-sensitive sites. The photoproducts distribution of drug-photosensitized reactions of 2'-deoxyguanosine and thymidine were established by HPLC as fingerprints for assignment of the DNA-photosensitization mechanism. Both Type I and Type II mechanisms were assigned to nucleoside-photosensitization by ofloxacin and levofloxacin. In the case of carprofen, a weak nucleoside degradation was obtained. The data suggest that levofloxacin, the (S) stereoisomer, might be slightly more efficient than racemic ofloxacin. In the case of carprofen the (S) isomer appears to be somewhat less active than its (R) enantiomer. However, due to the small differences found, the possible stereoselectivity has to be confirmed by future studies.
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Affiliation(s)
- V Lhiaubet-Vallet
- Departamento de Química, Instituto de Tecnología Química UPV-CSIC. Universidad Politécnica de Valencia, Camino de Vera s/n, E-46071 Valencia, Spain
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21
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Abstract
Drugs are usually biotransformed into new chemical species that may have either toxic or therapeutic effects. Drug metabolism studies are routinely performed in laboratory animals but, due to metabolic interspecies differences when compared to man, they are not accurate enough to anticipate the metabolic profile of a drug in humans. Human hepatocytes in primary culture provide the closest in vitro model to human liver and the only model that can produce a metabolic profile of a given drug that is very similar to that found in vivo. However their availability is limited due to the restricted access to suitable tissue samples. The scarcity of human liver has led to optimising the cryopreservation of adult hepatocytes for long-term storage and regular supply. Human hepatocytes in primary culture express typical hepatic functions and express drug metabolising enzymes. Moreover, qualitative and quantitative similarities between in vitro and in vivo metabolism of drugs were observed. Different strategies have been envisaged to prolong cell survival and delay the spontaneous decay of the differentiated phenotype during culture. Thus, hepatocytes represent the most appropriate model for the evaluation of integrated drug metabolism, toxicity/metabolism correlations, mechanisms of hepatotoxicity, and the interactions (inhibition and induction) of xenobiotics and drug-metabolising enzymes. However, in view of limitations of primary hepatocytes, efforts are made to develop alternative cellular models (i.e. metabolic competent CYP-engineered cells stably expressing individual CYPs and transient expression of CYPs by transduction of hepatoma cells with recombinant adenoviruses). In summary, several cellular tools are available to address key issues at the earliest stages of drug development for a better candidate selection and hepatotoxicity risk assessment.
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Affiliation(s)
- M J Gómez-Lechón
- Centro de Investigación, Hospital La Fe, Avda Campanar 21, 46009-Valencia, Spain.
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22
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Rodríguez-Antona C, Bort R, Jover R, Tindberg N, Ingelman-Sundberg M, Gómez-Lechón MJ, Castell JV. Transcriptional regulation of human CYP3A4 basal expression by CCAAT enhancer-binding protein alpha and hepatocyte nuclear factor-3 gamma. Mol Pharmacol 2003; 63:1180-9. [PMID: 12695546 DOI: 10.1124/mol.63.5.1180] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Cytochrome P450 3A4 (CYP3A4) is involved in the metabolism of more than 50% of currently used therapeutic drugs, yet the mechanisms that control CYP3A4 basal expression in liver are poorly understood. Several putative binding sites for CCAAT/enhancer-binding protein (C/EBP) and hepatic nuclear factor 3 (HNF-3) were found by computer analysis in CYP3A4 promoter. The use of reporter gene assays, electrophoretic mobility shift assays, and site-directed mutagenesis revealed that one proximal and two distal C/EBP alpha binding sites are essential sites for the trans-activation of CYP3A4 promoter. No trans-activation was found in similar reporter gene experiments with a HNF-3 gamma expression vector. The relevance of these findings was further explored in the more complex DNA/chromatin structure within endogenous CYP3A4 gene. Using appropriate adenoviral expression vectors, we found that both hepatic and nonhepatic cells overexpressing C/EBP alpha had increased CYP3A4 mRNA levels, but no effect was observed when HNF-3 gamma was overexpressed. In contrast, overexpression of HNF-3 gamma simultaneously with C/EBP alpha resulted in a greater activation of the CYP3A4 gene. This cooperative effect was hepatic-specific and also occurred in CYP3A5 and CYP3A7 genes. To investigate the mechanism for HNF-3 gamma action, we studied its binding to CYP3A4 promoter and the effect of the deacetylase inhibitor trichostatin A. HNF-3 gamma was able to bind CYP3A4 promoter at a distal position, near the most distal C/EBP alpha binding site. Trichostatin A increased C/EBP alpha effect but abolished HNF-3 gamma cooperative action. These findings revealed that C/EBP alpha and HNF-3 gamma cooperatively regulate CYP3A4 expression in hepatic cells by a mechanism that probably involves chromatin remodeling.
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Affiliation(s)
- C Rodríguez-Antona
- Departamento de Bioquímica, Facultad de Medicina, Universidad de Valencia, Valencia, Spain
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23
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Donato MT, Klocke R, Castell JV, Stenzel K, Paul D, Gómez-Lechón MJ. Constitutive and inducible expression of CYP enzymes in immortal hepatocytes derived from SV40 transgenic mice. Xenobiotica 2003; 33:459-73. [PMID: 12746103 DOI: 10.1080/0049825031000076168] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
1. The expression of liver-specific transcription factors and cytochrome P450 (CYP) enzymes have been studied in three new hepatocyte-like cell lines derived from SV Delta 202 transgenic mice: AMH-Delta 202 (adult mouse hepatocytes), TAMH-Delta 202 (tumour-derived adult mouse hepatocytes) and NMH-Delta 202 (newborn mouse hepatocytes). 2. mRNA levels of liver-enriched transcription factors such as D-element binding protein (DBP), liver-enriched transcription activating protein (LAP) and the hepatic nuclear factors (HNF) 1, 2 and 3 in all Delta 202 transgenic hepatocyte lines were similar to those in the wild-type liver and in primary mouse hepatocytes. 3. Analysis of basal CYP activities and testosterone metabolism revealed that Delta 202 cells showed higher similarities to mouse hepatocytes than Hepa 1c1c7 hepatoma cells. All three Delta 202 cell lines exhibited substantial active CYP1A1/2, CYP2A4/5 and CYP3A11 activities and lower levels of CYP2B, CYP2C and CYP2E1 activities. 4. The Delta 202 cells also responded to model inducers. 3-Methylcholanthrene induced CYP1A1/2 (7-ethoxyresorufin O-deethylation); phenobarbital induced CYP2B (7-benzoxyresorufin O-debenzylation), CYP2A4/5 (testosterone 7alpha -hydroxylation) and CYP3A11 (testosterone 6beta -hydroxylation); and rifampicin and dexamethasone induced CYP3A11 activities in the three Delta 202 cell lines, whereas only AMH-Delta 202 cells reproduced to a limited extent the response of CYP2E1 to ethanol observed in hepatocytes. 5. The results suggest that generation of hepatocyte lines from transgenic animals constitutes a successful approach to obtain in vitro models alternative to primary hepatocytes for drug metabolism and CYP inducibility studies.
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Affiliation(s)
- M T Donato
- Unidad de Hepatología Experimental, Centro de Investigación, Hospital Univesitario La Fe, Avda. Campanar 21, E-46009 Valencia, Spain
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Lahoz A, Hernández D, Miranda MA, Pérez-Prieto J, Morera IM, Castell JV. Antibodies directed to drug epitopes to investigate the structure of drug-protein photoadducts. Recognition of a common photobound substructure in tiaprofenic acid/ketoprofen cross-photoreactivity. Chem Res Toxicol 2001; 14:1486-91. [PMID: 11712905 DOI: 10.1021/tx0002482] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Drug-induced photoallergy is an immune adverse reaction to the combined effect of drugs and light. From the mechanistic point of view, it first involves covalent binding of drug to protein resulting in the formation of a photoantigen. Hence, determination of the structures of drug-protein photoadducts is of great relevance to understand the molecular basis of photoallergy and cross-immunoreactivity among drugs. Looking for new strategies to investigate the covalent photobinding of drugs to proteins, we generated highly specific antibodies to drug chemical substructures. The availability of such antibodies has allowed us to discriminate between the different modes by which tiaprofenic acid (TPA), suprofen (SUP), and ketoprofen (KTP) photobind to proteins. The finding that the vast majority of the TPA photoadduct can be accounted for by means of antibody anti-benzoyl strongly supports the view that the drug binds preferentially via the thiophene ring, leaving the benzene ring more accessible. By contrast, selective recognition of SUP-protein photoadducts by antibody anti-thenoyl evidences a preferential coupling via the benzene ring leaving the thiophene moiety more distant from the protein matrix. In the case of KTP, photoadducts are exclusively recognized by antibody anti-benzoyl, indicating that the benzene ring is again more accessible. As a result of this research, we have been able to identify a common substructure that is present in TPA-albumin and KTP-albumin photoadducts. This is remarkable since, at a first sight, the greatest structural similarities can be found between TPA and SUP as they share the same benzoylthiophene chromophore. These findings can explain the previously reported observations of cross-reactivity to KTP (or TPA) in patients photosensitized to TPA (or KTP).
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Affiliation(s)
- A Lahoz
- Research Center, University Hospital La Fe, Valencia, Spain
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25
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Rodríguez-Antona C, Donato MT, Pareja E, Gómez-Lechón MJ, Castell JV. Cytochrome P-450 mRNA expression in human liver and its relationship with enzyme activity. Arch Biochem Biophys 2001; 393:308-15. [PMID: 11556818 DOI: 10.1006/abbi.2001.2499] [Citation(s) in RCA: 108] [Impact Index Per Article: 4.7] [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: 12/12/2022]
Abstract
CYP activity and protein contents have been measured in human liver using different techniques. In contrast, CYP mRNA data are scarce and the relationships between CYP mRNA contents and activities have not been established. These studies deserve further attention because mRNA determinations by RT-PCR require a very small amount of material (e.g., liver needle biopsy) and could provide important data regarding CYP expression regulation. In this study we measured in 12 human liver samples the mRNA contents of 10 CYPs by quantitative RT-PCR and the metabolic activities using specific substrates. mRNA contents and activities showed high correlation coefficients for CYP1A1, CYP1A2, CYP3A4, CYP2D6, and CYP2B6 (0.96, 0.94, 0.69, 0.61, and 0.52, respectively), but no significant correlations were found for CYP2C9, CYP2A6, and CYP2E1. The results suggest that the regulation of CYP1A1, CYP1A2, CYP3A4, CYP2D6, and CYP2B6 expression is essentially pretranslational and that their mRNA levels could allow a good estimate of their activity.
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Affiliation(s)
- C Rodríguez-Antona
- Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Universidad de Valencia, Avenida Blasco Ibáñez 20, Valencia, E-46010, Spain
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26
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Moser J, Hye A, Lovell WW, Earl LK, Castell JV, Miranda MA. Mechanisms of drug photobinding to proteins: photobinding of suprofen to human serum albumin. Toxicol In Vitro 2001; 15:333-7. [PMID: 11566558 DOI: 10.1016/s0887-2333(01)00033-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Photobinding of drugs to biomolecules constitutes an important early event in the onset of photoallergy. In the present work, UV irradiation of human serum albumin in the presence of either suprofen (SUP) or its major photoproduct, decarboxylated suprofen (DSUP), has been studied as a model system for drug-photosensitised protein binding. Both dark binding and binding in the presence of light were investigated since this will affect the mode, site and mechanism of drug interaction with the protein. In order to determine the binding features of SUP to albumin, competitive binding experiments were carried out using fluorescent probes specific for site I and II. Suprofen was found to selectively dark bind to site II on HSA. Photobinding of DSUP to HSA was more efficient than SUP. Parallel to this, the intrinsic tryptophan fluorescence of HSA decreased when the protein was previously irradiated in the presence of the photoactive compounds, again being DSUP more efficient compared with SUP. As fluorescence quenching involves electron transfer from the excited Trp to the ground state DSUP, it follows that the photoactive compound binding to HSA must be on (or in close proximity to) site I Trp(214) residue. It appears that photobinding of SUP is largely preceded by its photodecomposition to DSUP which, in turn, associates and photobinds to HSA.
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Affiliation(s)
- J Moser
- SEAC Toxicology Unit, Unilever Research, Colworth House, Sharnbrook, Bedford MK44 1LQ, UK
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27
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Pelkonen O, Myllynen P, Taavitsainen P, Boobis AR, Watts P, Lake BG, Price RJ, Renwick AB, Gómez-Lechón MJ, Castell JV, Ingelman-Sundberg M, Hidestrand M, Guillouzo A, Corcos L, Goldfarb PS, Lewis DF. Carbamazepine: a 'blind' assessment of CVP-associated metabolism and interactions in human liver-derived in vitro systems. Xenobiotica 2001; 31:321-43. [PMID: 11513246 DOI: 10.1080/00498250110055479] [Citation(s) in RCA: 44] [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: 10/16/2022]
Abstract
1. The ability of various in vitro systems for CYP enzymes (computer modelling, human liver microsomes, precision-cut liver slices, hepatocytes in culture, recombinant enzymes) to predict various aspects of in vivo metabolism and kinetics of carbamazepine (CBZ) was investigated. 2. The study was part of the EUROCYP project that aimed to evaluate relevant human in vitro systems to study drug metabolism. 3. CBZ was given to the participating laboratories without disclosing its chemical nature. 4. The most important enzyme (CYP3A4) and metabolic route (10,11-epoxidation) were predicted by all the systems studied. 5. Minor enzymes and routes were predicted to a different extent by various systems. 6. Prediction of a clearance class, i.e. slow clearance, was correctly predicted by microsomes, slices, hepatocytes and recombinant enzymes (CYP3A4). 7. The 10,11-epoxidation of CBZ by the recombinant CYP3A4 was enhanced by the addition of exogenous cytochrome-b5, leading to a considerable over-prediction. 8. Induction potency of CBZ was predicted in cultured hepatocytes in which 7-ethoxycoumarin O-deethylase was used as an index activity. 9. It seems that for a principally CYP-metabolized substance such as CBZ, all liver-derived systems provide useful information for prediction of metabolic routes, rates and interactions.
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Affiliation(s)
- O Pelkonen
- University of Oulu, Department of Pharmacology and Toxicology, Finland.
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28
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Andersson TB, Sjöberg H, Hoffmann KJ, Boobis AR, Watts P, Edwards RJ, Lake BG, Price RJ, Renwick AB, Gómez-Lechón MJ, Castell JV, Ingelman-Sundberg M, Hidestrand M, Goldfarb PS, Lewis DF, Corcos L, Guillouzo A, Taavitsainen P, Pelkonen O. An assessment of human liver-derived in vitro systems to predict the in vivo metabolism and clearance of almokalant. Drug Metab Dispos 2001; 29:712-20. [PMID: 11302938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023] Open
Abstract
The ability of various human derived in vitro systems to predict various aspects of the in vivo metabolism and kinetics of almokalant have been investigated in a multicenter collaborative study. Although almokalant has been withdrawn from further clinical development, its metabolic and pharmacokinetic properties have been well characterized. Studies with precision-cut liver slices, primary hepatocyte cultures, and hepatic microsomal fractions fortified with UDP-glucuronic acid all suggested that almokalant is mainly glucuronidated to the stereoisomers M18a and M18b, which is in good agreement with the results in vivo. Both in vivo and in vitro studies indicate that the formation of M18b dominates over that of M18a, although the difference is more pronounced with the in vitro systems. Molecular modeling, cDNA-expressed enzyme analysis, correlation analysis, and inhibition studies did not clearly indicate which P450 enzymes catalyze the oxidative pathways, which may indicate a problem in identifying responsible enzymes for minor metabolic routes by in vitro methods. All of the in vitro systems underpredicted the metabolic clearance of almokalant, which has previously been reported to be a general problem for drugs that are cleared by P450-dependent metabolism. Although few studies on in vivo prediction of primarily glucuronidated drugs have appeared, in vitro models may consistently underpredict in vivo metabolic clearance. We conclude that in vitro systems, which monitor phase II metabolism, would be beneficial for prediction of the in vivo metabolism, although all of the candidate liver-derived systems studied here, within their intrinsic limitations, provided useful information for predicting metabolic routes and rates.
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Affiliation(s)
- T B Andersson
- Drug Metabolism and Pharmacokinetics and Bioanalytical Chemistry, AstraZeneca Research and Development, Mölndal, S-431 83 Mölndal, Sweden.
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29
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Gómez-Lechón MJ, Ponsoda X, Bort R, Castell JV. The use of cultured hepatocytes to investigate the metabolism of drugs and mechanisms of drug hepatotoxicity. Altern Lab Anim 2001; 29:225-31. [PMID: 11387019 DOI: 10.1177/026119290102900307] [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: 11/17/2022]
Abstract
Hepatotoxins can be classified as intrinsic when they exert their effects on all individuals in a dose-dependent manner, and as idiosyncratic when their effects are the consequence of an abnormal metabolism of the drug by susceptible individuals (metabolic idiosyncrasy) or of an immune-mediated injury to hepatocytes (allergic hepatitis). Some xenobiotics are electrophilic, and others are biotransformed by the liver into highly reactive metabolites that are usually more toxic than the parent compound. This activation process is the key to many hepatotoxic phenomena. Mitochondria are a frequent target of hepatotoxic drugs, and the alteration of their function has immediate effects on the energy balance of cells (depletion of ATP). Lipid peroxidation, oxidative stress, alteration of Ca(2+) homeostasis, and covalent binding to cell macromolecules are the molecular mechanisms that are frequently involved in the toxicity of xenobiotics. Against these potential hazards, cells have their own defence mechanisms (for example, glutathione, DNA repair, suicide inactivation). Ultimately, toxicity is the balance between bioactivation and detoxification, which determines whether a reactive metabolite elicits a toxic effect. The ultimate goal of in vitro experiments is to generate the type of scientific information needed to identify compounds that are potentially toxic to man. For this purpose, both the design of the experiments and the interpretation of the results are critical.]
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Affiliation(s)
- M J Gómez-Lechón
- Unidad de Hepatologia Experimental, Centro de Investigación, Hospital Universitario La Fe, Avenida de Campanar 21, 46009 Valencia, Spain
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Donato MT, Ponsoda X, O'Connor E, Castell JV, Gómez-Lechón MJ. Role of endogenous nitric oxide in liver-specific functions and survival of cultured rat hepatocytes. Xenobiotica 2001; 31:249-64. [PMID: 11491387 DOI: 10.1080/00498250110052111] [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: 10/16/2022]
Abstract
1. The role of endogenous nitric oxide in rat hepatocyte functionality and survival in cell culture was examined. Towards this aim, cytochrome P450 activities (CYP1A1/2, 2B1, 2A1, 2C11, 2D1, 2E1 and 3A1), liver-specific metabolic functions and cell survival were comparatively evaluated in hepatocytes isolated from the male Sprague-Dawley rat and/or cultured in control conditions or in the presence of N-omega-nitro-L-arginine methyl ester (NAME), an inhibitor of nitric oxide synthesis. 2. Suppression of nitric oxide production by NAME paralleled a substantial preservation of hepatocyte phenotype in culture. The presence of NAME was particularly important during isolation and/or the 6-24h culture. By 24h, beneficial effects were evident in parameters particularly unstable in culture (glycogen content, P450), whereas no changes were produced in well-preserved functions (glucose, urea and albumin synthesis, glutathione, drug-conjugating enzymes). 3. Long-term treatment of hepatocytes with NAME also produced a reduction in caspase 3 activation and in the percentage of spontaneous apoptotic cells, and an increase in cell survival and transcriptional activity as shown by attached cellular protein content and the protein-DNA ratio respectively. 4. In conclusion, inhibition of early endogenous nitric oxide formation is an efficient procedure for obtaining hepatocyte cultures with stable expression of differentiated functions, high cell survival and few signs of cell senescence.
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Affiliation(s)
- M T Donato
- Unidad de Hepatología Experimental, Centro de Investigation, Hospital Universitario La Fe, Valencia, Spain
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31
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Gómez-Lechón MJ, Donato T, Jover R, Rodriguez C, Ponsoda X, Glaise D, Castell JV, Guguen-Guillouzo C. Expression and induction of a large set of drug-metabolizing enzymes by the highly differentiated human hepatoma cell line BC2. Eur J Biochem 2001; 268:1448-59. [PMID: 11231298 DOI: 10.1046/j.1432-1327.2001.02011.x] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The BC2 cell line derived from the human hepatocarcinoma, HGB, undergoes a spontaneous sharp differentiation process in culture as it becomes confluent, remains stably differentiated for several weeks, and may return to proliferation thereafter under appropriate density conditions. The relevance of the line as an hepatic model has been evaluated. Cells synthesize a large number of plasma proteins, and rates of glycogen and urea synthesis increase with time of confluency and become sensitive to insulin, reflecting the process of differentiation. Differentiated BC2 cells express the most relevant cytochrome P-450 (CYP) isozyme activities (CYP1A1/2, 2A6, 2B6, 2C9, 2E1, and 3A4) and conjugating enzymes (glutathione S-transferase and UDP-glucuronyltransferase) and also respond to model inducers. Methylcholanthrene induced an increase in CYP1A1/2 enzyme activity (eightfold), phenobarbital induced CYP2B6 activity (1.7-fold), and dexamethasone induced CYP3A4 activity (fivefold). In parallel, expression of the most relevant liver-enriched transcription factors, HNF-4, HNF-1, C/EBP-alpha and C/EBP-beta mRNAs, was significantly increased in differentiated cultures. This increase was largest in HNF-1 and HNF-4, which supports the idea that a redifferentiation process towards the hepatic phenotype takes place. BC2 is an hepatic cell line that is able to express most hepatic functions, especially the drug-biotransformation function, far more efficiently than any previously described human hepatoma cell line.
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Affiliation(s)
- M J Gómez-Lechón
- Unidad de Hepatología Experimental, Centro de Investigación, Hospital U. La Fe, Valencia, Spain.
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32
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Jover R, Bort R, Gómez-Lechón MJ, Castell JV. Cytochrome P450 regulation by hepatocyte nuclear factor 4 in human hepatocytes: a study using adenovirus-mediated antisense targeting. Hepatology 2001; 33:668-75. [PMID: 11230748 DOI: 10.1053/jhep.2001.22176] [Citation(s) in RCA: 158] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Hepatocyte nuclear factor 4 (HNF4) is a member of the nuclear receptor super-family that has shown activating effects on particular cytochrome P450 (CYP) promoters from several species. However, its role in the regulation of human CYPs in the liver is still poorly understood, as no comprehensive studies in human-relevant models have been performed. In the present study, we have investigated whether HNF4 plays a general role in the expression of 7 major CYP genes in primary cultured human hepatocytes. To this end, we developed an adenoviral vector for efficient expression of HNF4 antisense RNA. Transduction of human hepatocytes with the recombinant adenovirus resulted in a time-dependent increase in the antisense transcript, followed by a concomitant decrease in apolipoprotein C III mRNA (a target gene of HNF4). Specificity was confirmed by showing that increasing levels of HNF4 antisense RNA resulted in the reduction of HNF4 protein, whereas retinoic X receptoralpha-(RXRalpha), the closest homologous member of the nuclear receptor super-family, was unaffected. Analysis of CYP gene expression in human hepatocytes transfected with HNF4 antisense RNA revealed singular behaviors: (1) CYP3A4, CYP3A5, and CYP2A6 showed an important, dose-dependent down-regulation on blockage of HNF4 translation; (2) a moderate inhibition of CYP2B6, CYP2C9, and CYP2D6 expression was observed (40%-45% reduction); (3) the levels of CYP2E1 were not affected even in the absence of this transcription factor. In conclusion, using an original strategy (efficient antisense RNA expression vector), our study shows that HNF4 is a general regulator supporting the expression of major drug-metabolizing CYPs in human hepatocytes.
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Affiliation(s)
- R Jover
- Unidad de Hepatología Experimental, Centro de Investigación, Hospital Universitario La Fe, SVS, Valencia, Spain
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Gómez-Lechón MJ, Jover R, Donato T, Ponsoda X, Castell JV. Expression of liver specific-genes in hepatocytes cultured in collagen gel matrix. Prog Mol Subcell Biol 2001; 25:89-104. [PMID: 10986720 DOI: 10.1007/978-3-642-59766-4_6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Affiliation(s)
- M J Gómez-Lechón
- Unidad de Hepatología Experimental, Centro de Investigación, Valencia, Spain
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Cortijo J, Urbieta E, Bort R, Castell JV, Ruiz-Bravo C, Martinez J, Palacios-Pelaez R, Lledó S, Morcillo EJ. Biotransformation in vitro of the 22R and 22S epimers of budesonide by human liver, bronchus, colonic mucosa and skin. Fundam Clin Pharmacol 2001; 15:47-54. [PMID: 11468013 DOI: 10.1046/j.1472-8206.2001.00005.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The pharmacological effects of glucocorticoids are greatly influenced by their pharmacokinetic properties. In the present report, the in vitro biotransformation of the 22R and 22S epimers of the topical steroid budesonide was studied in the S-9 fraction of human liver, bronchus, skin and colonic mucosa. The disappearance of unchanged epimers of budesonide was measured during 90 min of incubation by high performance liquid chromatography. The rate of disappearance was high in human liver while little biotransformation occurred in bronchial tissue and colonic mucosa, and none was detected in the skin. A marked decay of the initial concentration of unchanged budesonide epimers was noticed after 2 h incubation in cultured human hepatocytes, while only a small decrease was observed after 24 h incubation in cultured human airway smooth muscle cells and BEAS-2B cells. The 22R epimer of budesonide suffered greater in vitro biotransformation than the 22S epimer in human hepatic, bronchial and colonic tissues. These findings extend those of other studies, and confirm that the high therapeutic ratio of budesonide is due to negligible local biotransformation combined with high level of liver metabolism for locally absorbed budesonide.
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Affiliation(s)
- J Cortijo
- Department of Pharmacology, University of Valencia, Valencia, Spain.
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35
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Ponsoda X, Pareja E, Gómez-Lechón MJ, Fabra R, Carrasco E, Trullenque R, Castell JV. Drug biotransformation by human hepatocytes. In vitro/in vivo metabolism by cells from the same donor. J Hepatol 2001; 34:19-25. [PMID: 11211902 DOI: 10.1016/s0168-8278(00)00085-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
BACKGROUND/AIMS Cultured human hepatocytes are considered a close model to human liver. However, the fact that hepatocytes are placed in a microenvironment that differs from that of the cell in the liver raises the question: to what extent does drug metabolism in vitro reflect that of the liver in vivo? This issue was examined by investigating the in vitro and in vivo metabolism of aceclofenac, an analgesic/anti-inflammatory drug. METHODS Hepatocytes isolated from programmed liver biopsies were incubated with aceclofenac, and the metabolites formed were investigated by HPLC. During the course of clinical recovery, patients were given the drug, and the metabolites, largely present in the urine, were analyzed. In vitro and in vivo data of the same individual were compared. RESULTS The relative abundance of oxidized metabolites in vitro (i.e. 4'OH-aceclofenac + 4'OH-diclofenac vs. total hydroxylated metabolites; Spearman's p = 0.855), as well the hydrolysis of aceclofenac (4'OH-diclofenac vs. 4'OH-aceclofenac + 4'OH-diclofenac; p = 0.691) correlated well with in vivo data. The conjugation of the drug in vitro (24.6 +/- 7.6%) was lower than that in vivo (44.9 +/- 5.3%). The rate of 4'OH-aceclofenac formation in vitro correlated with the amount of metabolites excreted in urine after 16 h (p = 0.95). CONCLUSIONS The in vitro/in vivo metabolism of the drug was surprisingly similar in each patient. The variability observed in vitro reflected an existing phenotypic variability among donors.
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Affiliation(s)
- X Ponsoda
- Unidad de Hepatología Experimental, Centro de Investigación, Hospital Universitario la Fe, Valencia, Spain
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36
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Donato MT, Viitala P, Rodriguez-Antona C, Lindfors A, Castell JV, Raunio H, Gómez-Lechón MJ, Pelkonen O. CYP2A5/CYP2A6 expression in mouse and human hepatocytes treated with various in vivo inducers. Drug Metab Dispos 2000; 28:1321-6. [PMID: 11038160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023] Open
Abstract
Induction of coumarin 7-hydroxylation, catalyzed by CYP2A5 in mice and CYP2A6 in humans by various known in vivo murine inducers and modifiers, was compared in human and mouse hepatocytes in culture. Phenobarbital and rifampicin were efficient inducers (up to 10-fold induction) after 48-h treatment in murine cultured hepatocytes, whereas the enzyme activity in human hepatocytes was much more refractory to induction. However, a prolongation of incubation time to 72 h in human hepatocytes led to a modest restoration of inducibility by phenobarbital. Of the three porphyrinogenic inducers studied, griseofulvin induced the murine enzyme efficiently, but not the human enzyme, whereas aminotriazole and thioacetamide had no effect on either species. Pyrazole produced substantial induction in both human and murine hepatocytes, whereas cobalt chloride, which is also an in vivo inducer of the mouse enzyme, had no effect. Clofibric acid, an in vivo depressor of coumarin 7-hydroxylase, also depressed hepatocyte activities. In both murine and human hepatocytes, changes in CYP2A5/6 mRNA levels correlated roughly with enzyme changes, except in the case of cobalt chloride, which increased mRNA levels despite a lack of effect on enzyme activity. In general, human and mouse hepatocytes gave a similar response to CYP2A inducers. However, some differences were found, which means that, although CYP2A isozymes are probably regulated in a similar manner in both species, it is necessary to be cautious before extrapolating to human the results found in mouse models.
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Affiliation(s)
- M T Donato
- Unidad de Hepatología Experimental, Centro de Investigation, Hospital Universitario La Fe, Valencia, Spain
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Althaus M, Retzow A, Castell JV, Gómez-Lechón MJ, Amalou Z, Rose T, Appel K. In vitro identification of the cytochrome P450 isoform responsible for the metabolism of alpha-dihydroergocryptine. Xenobiotica 2000; 30:1033-45. [PMID: 11197065 DOI: 10.1080/00498250010002261] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
1. The in vitro metabolism of alpha-dihydroergocryptine (DHEC, Almirid), an ergot-derived dopamine agonist for the treatment of Parkinson's disease, has been studied in cultured cell lines following incubation with DHEC. Human hepatocytes as well as two sets of metabolically competent cell lines expressing one single human cytochrome P450 (1A1, 1A2, 1B1, 2A6, 2C8, 2C9, 2C18, 2C19, 2D6, 2E1, 3A4) were used. 2. Mono- and dihydroxy metabolites of DHEC could only be detected in the culture media of the cell line expressing human cytochrome CYP3A4. The same metabolites were found in the media of cultured human hepatocytes derived from three different donors. After 24-h incubation with 1 microM DHEC, approximately 60% mono- and approximately 20% dihydroxy metabolites were detected, i.e. approximately 80% of DHEC was metabolized. Further, DHEC demonstrated an inhibitory effect on CYP3A4-mediated testosterone metabolism and additionally could induce CYP3A4 and CYP2E1 mRNA when added at 10 microM to cultured human hepatocytes. 3. The data suggest that DHEC metabolism in humans is primarily mediated by the CYP3A4 isoform. The results are in accordance with findings derived from other ergot alkaloids.
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Affiliation(s)
- M Althaus
- Desitin Arzneimittel GmbH, Weg beim Jäger 214, D-22335 Hamburg, Germany.
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38
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Spielmann H, Müller L, Averbeck D, Balls M, Brendler-Schwaab S, Castell JV, Curren R, Gibbs NK, Liebsch M, Lovell WW, Merk HF, Nash JF, Neumann NJ, Pape WJ, Ulrich P, Vohr HW. The second ECVAM workshop on phototoxicity testing. The report and recommendations of ECVAM workshop 42. Altern Lab Anim 2000; 28:777-814. [PMID: 11105201 DOI: 10.1177/026119290002800603] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- H Spielmann
- ZEBET, BgVV, Diedersdorfer Weg 1, 12277 Berlin, Germany.
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Sarabia Z, Hernández D, Castell JV, van Henegouwen GM. Photoreactivity of tiaprofenic acid and suprofen using pig skin as an ex vivo model. J Photochem Photobiol B 2000; 58:32-6. [PMID: 11195850 DOI: 10.1016/s1011-1344(00)00098-1] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The skin is repeatedly exposed to solar ultraviolet radiation. Photoreaction of drugs in the body may result in phototoxic or photoallergic side effects. Non-steroidal anti-inflammatory drugs, such as tiaprofenic acid (TPA) and the closely related isomer suprofen (SUP) are frequently associated with photosensitive disorders; they may mediate photosensitised damage to lipids, proteins and nucleic acids. Using ex vivo pig skin as a model, we investigated the photodegradation of TPA and SUP, and photobinding of these drugs to protein by means of HPLC analysis and drug-directed antibodies. Both with keratinocytes, which were first isolated from the pig skin and thereafter exposed to UVA and with keratinocytes which were isolated from pig skin after the skin was UVA exposed, time-dependent photodegradation of TPA and SUP was found, beside photoadduct formation to protein. The results of this work show that: (a) TPA and SUP were photodecomposed with similar efficiency; major photoproducts detected were decarboxytiaprofenic acid (DTPA) and decarboxysuprofen (DSUP), respectively. (b) Both drugs form photoadducts, as concluded from recognition by drug-specific antibodies. Pig skin appears to be a good model for studying the skin photosensitising potential of drugs.
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Affiliation(s)
- Z Sarabia
- Department of Medicinal Photochemistry, Leiden/Amsterdam Center for Drug Research, Leiden University, The Netherlands
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40
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Barratt MD, Castell JV, Miranda MA, Langowski JJ. Development of an expert system rulebase for the prospective identification of photoallergens. J Photochem Photobiol B 2000; 58:54-61. [PMID: 11195853 DOI: 10.1016/s1011-1344(00)00100-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Relationships between the structure and properties of chemicals can be programmed into knowledge-based systems such as DEREK (an acronym for 'Deductive Estimation of Risk from Existing Knowledge'). The DEREK knowledge-based computer system contains a sub-set of over 50 rules describing chemical substructures (toxophores) responsible for skin sensitization. This rulebase, based originally on Unilever historical in-house guinea pig maximisation test data, is largely complete and is undergoing refinement as the next stage of its development. As part of an ongoing program of validation and testing, the predictive ability of the sensitization rule set was assessed by processing the structures of over 100 chemical substances in the list of contact allergens identified by the BgVV (German Federal Institute for Health Protection of Consumers). The exercise highlighted areas of chemistry where further development of the rulebase was required, either by extension of the scope of existing rules or by generation of new rules where a sound mechanistic rationale for the biological activity could be established. Several chemicals likely to be acting as photoallergens were identified and rules for photoallergenicity were written covering three classes of chemicals. This paper describes work to extend the DEREK rules for photoallergenicity as part of the European Phototox Project.
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Ouédraogo G, Morlière P, Santus R, Castell JV. Damage to mitochondria of cultured human skin fibroblasts photosensitized by fluoroquinolones. J Photochem Photobiol B 2000; 58:20-5. [PMID: 11195848 DOI: 10.1016/s1011-1344(00)00101-9] [Citation(s) in RCA: 40] [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: 11/29/2022]
Abstract
The phototoxic fluoroquinolones ofloxacin, lomefloxacin, norfloxacin, ciprofloxacin and BAYy 3118 have ionizable groups with pKa values close to neutrality. Different ionic species of these fluoroquinolones, therefore, partition in various compartments and organelles of living cells according to their ionic equilibria. While all these fluoroquinolones accumulate in lysosomes, they more or less stain the rest of the cytoplasm of living HS 68 fibroblasts. As a result, photosensitized damage to other cytoplasmic sites than lysosomes can also be expected. Using microfluorometry and rhodamine 123 (Rh 123) as a specific fluorescent probe which is released from mitochondria by light absorption, we show that under ultraviolet A (UVA) irradiation norfloxacin and ciprofloxacin readily damage mitochondrial membranes. as evidenced by the UVA dose-dependent strongly accelerated release of Rh 123 from mitochondria in cells treated with norfloxacin and ciprofloxacin. Damages are already noticeable at UVA doses as low as 2 J/cm2. By contrast, no such photoinduced damage can be observed with ofloxacin, lomefloxacin and BAYy 3118, the latter being the most phototoxic derivative towards HS 68 fibroblasts. The initial photodamage induced by norfloxacin and ciprofloxacin can then propagate after the irradiation as shown by the strongly increased rate of release of Rh 123 from mitochondria of cells that have been incubated with these two fluoroquinolones and left in the dark after a pre-irradiation with 18 J/cm2 of UVA. Interestingly, the same pre-irradiation after cells have been treated with BAYy 3118 and lomefloxacin induces similar post-irradiation effects, although they have no apparent immediate photosensitizing action on mitochondria.
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Affiliation(s)
- G Ouédraogo
- Laboratoire de Photobiologie, Muséum National d'Histoire Natulrelle, Paris, France
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42
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Abstract
Carprofen is a non-steroidal antiinflammatory drug with marked photosensitising properties. In order to elucidate the mechanisms underlying the phenomenon of drug-protein photobinding, mixtures of the drug and human serum albumin were irradiated under different experimental conditions. After irradiation and subsequent gel-filtration chromatography of the photomixture, the eluting protein fraction was analysed by means of fluorescence spectroscopy. The formation of drug-protein photoadducts could be evidenced by the characteristic emission properties of the carbazole chromophore. The photobinding of the drug to human serum albumin appears to involve the formation of aryl radicals resulting from carbon-halogen photocleavage. This mechanistic interpretation is supported by the observed variations in the intensity of the fluorescence spectra, which can be correlated with the lower quantum yield emission of chlorocarbazoles as compared to non-halogenated analogues. The results from laser flash photolysis studies are also in agreement with this proposal.
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Affiliation(s)
- J Moser
- SEAC Toxicology Unit, Unilever Research, Sharnbrook, Bedford, UK
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43
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Agapakis-Caussé C, Boscá F, Castell JV, Hernández D, Marín ML, Marrot L, Miranda MA. Tiaprofenic acid-photosensitized damage to nucleic acids: a mechanistic study using complementary in vitro approaches. Photochem Photobiol 2000; 71:499-505. [PMID: 10818779 DOI: 10.1562/0031-8655(2000)071<0499:tapdtn>2.0.co;2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In order to determine whether or not tiaprofenic acid (TPA) could cause cellular DNA damage, human fibroblasts were irradiated in the presence of the drug and subsequently examined by means of the comet assay. This led to the observation that TPA actually sensitizes cellular DNA to the subsequent irradiation. When TPA was irradiated in the presence of supercoiled plasmid DNA, it produced large amounts of single-strand breaks (SSB); this is consistent with the effects observed on cellular genomic DNA by the comet assay. More importantly, low concentrations of TPA, unable to produce direct SSB, caused photo-oxidative damage to DNA as revealed by the use of excision-repair enzymes. The fact that TPA-irradiated DNA was a substrate of formamidopyrimidine glycosylase as well as endonuclease III revealed that both purine and pyrimidine bases were oxidized. This was further supported by the TPA-photosensitized oxidation of 2'-deoxyguanosine which led to a product mixture characteristic of mixed type-I/II mechanisms. Thymidine was less reactive under similar conditions, but it also decomposed to give a typical type-I product pattern. Accordingly, the TPA triplet was quenched by the two nucleosides with clearly different rate constants (10(8) vs 10(7) M-1 s-1, respectively). As cellular RNA also contains oxidizable bases, it could be the target of similar processes, thus interfering with the biosynthesis of proteins by the cells. Extraction of total RNA from TPA-irradiated human fibroblasts, followed by gel electrophoresis and PCR analysis, confirmed this hypothesis. Finally, photosensitization experiments with Saccharomyces cerevisiae showed that, in spite of an efficient drug-yeast interaction leading to cytotoxicity, neither intergenic recombination nor gene conversion took place. Thus, while TPA-photosensitized damage to nucleic acids can result in genotoxicity, the risk of mutagenicity does not appear to be significant.
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Affiliation(s)
- C Agapakis-Caussé
- L'Oreal Advanced Research, Group of Genotoxicity, Aulnay sous Bois, France
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Rodríguez-Antona C, Jover R, Gómez-Lechón MJ, Castell JV. Quantitative RT-PCR measurement of human cytochrome P-450s: application to drug induction studies. Arch Biochem Biophys 2000; 376:109-16. [PMID: 10729196 DOI: 10.1006/abbi.2000.1697] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A quantitative RT-PCR assay has been developed that is able to measure the mRNA content of the major human CYPs (1A1, 1A2, 2A6, 2B6, 2C9, 2C19, 2D6, 2E1, 3A4, and 3A5). The technique is highly specific, reproducible, rapid, and sensitive enough to quantitate low and high abundant mRNAs. The PCR primers were selected to specifically match each CYP mRNA, to have a very close annealing temperature, and to render PCR products of similar sizes. The PCR conditions were designed to allow the simultaneous measurement of the various human liver CYPs in a single run. To achieve precise and reproducible quantitation of each cytochrome mRNA, a external standard (luciferase mRNA) is added to the probes to monitor the efficiency of the RT step. The degree of amplification is estimated using appropriate cDNA standards and quantitation of the amplified products by fluorescent measurement. This assay can be used to quantify the most relevant CYPs in human liver and cultured human hepatocytes. CYPs 3A4 and 2E1 were the most abundant mRNAs in human liver (2.5 and 1.7 x 10(8) molecules/microgram of total RNA respectively), whereas 1A1 and 2D6 were the least abundant isoforms (1.2 and 2.1 x 10(6) molecules/microgram of total RNA). A similar pattern was also found in short-term cultured human hepatocytes. This technique is also suitable for assessing CYP mRNA induction by xenobiotics. Cells exposed to 3-methylcholanthrene showed a characteristic increased expression of CYP1A2 and 1A1 mRNAs. Upon incubation with phenobarbital and rifampin (rifampicin), human hepatocytes increased CYP 2B6, 3A4, and 3A5 among others.
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Affiliation(s)
- C Rodríguez-Antona
- Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, Universidad de Valencia, Avda. Blasco Ibáñez, 20, Valencia, E-46010, Spain
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Gómez-Lechón MJ, Castell JV, Donato T, Pahernik S, Thasler W, Koebe HG, Doser M, Dauner M, Planck H. New non-woven polyurethane-based biomaterials for the cultivation of hepatocytes: expression of differentiated functions. J Mater Sci Mater Med 2000; 11:37-41. [PMID: 15348097 DOI: 10.1023/a:1008985618651] [Citation(s) in RCA: 2] [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: 05/24/2023]
Abstract
A new non-woven polyetherurethane support suitable to host cultured hepatocytes has been developed. Prior to its use in bioreactors and artificial liver devices, the biocompatibility of this new material was investigated. The experiments have shown that the survival and functionality of hepatocytes entrapped in the non-woven polymer were longer than that of monolayer cultured hepatocytes, under serum-free culture conditions. Hepatic specific metabolic functions, namely, synthesis of urea and synthesis and secretion of plasma proteins, were well maintained by hepatocytes entrapped in non-woven polyetherurethane sheets. Cells also retained the expression of biotransformation activities of 7-ethoxycoumarin-O-deethylase as well as CYP2A1, CYP2B1 and CYP3A1. The results presented in this paper point to non-woven polyetherurethane sheets as a suitable biocompatible support for functional, three-dimensional hepatocyte cultures.
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Affiliation(s)
- M J Gómez-Lechón
- Unidad de Hepatología Experimental, Centro de Investigación, Hospital U. La Fe. Avda. Campanar 21, E-46009 Valencia, Spain
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Walton K, Walker R, van de Sandt JJ, Castell JV, Knapp AG, Kozianowski G, Roberfroid M, Schilter B. The application of in vitro data in the derivation of the acceptable daily intake of food additives. Food Chem Toxicol 1999; 37:1175-97. [PMID: 10654594 DOI: 10.1016/s0278-6915(99)00107-6] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The acceptable daily intake (ADI) for food additives is commonly derived from the NOAEL (no-observed-adverse-effect level) in long-term animal in vivo studies. To derive an ADI a safety or uncertainty factor (commonly 100) is applied to the NOAEL in the most sensitive test species. The 100-fold safety factor is considered to be the product of both species and inter-individual differences in toxicokinetics and toxicodynamics. Although in vitro data have previously been considered during the risk assessment of food additives, they have generally had no direct influence on the calculation of ADI values. In this review 18 food additives are evaluated for the availability of in vitro toxicity data which might be used for the derivation of a specific data-derived uncertainty factor. For the majority of the food additives reviewed, additional in vitro tests have been conducted which supplement and support the short- and long-term in vivo toxicity studies. However, it was recognized that these in vitro studies could not be used in isolation to derive an ADI; only when sufficient in vivo mechanistic data are available can such information be used in a regulatory context. Additional short-term studies are proposed for the food additives which, if conducted, would provide data that could then be used for the calculation of data-derived uncertainty factors.
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Affiliation(s)
- K Walton
- Clinical Pharmacology Group, University of Southampton, UK
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Abstract
Increased toxicity of cocaine to human hepatocytes is observed when cells are simultaneously incubated with ethanol. Ethanol might exacerbate cocaine hepatocyte toxicity by three different pathways: a) by increasing the oxidative metabolism of cocaine and hence the oxidative damage; b) by the formation of a more toxic metabolite, namely cocaethylene; or c) by decreasing the defence mechanisms of the cell (i.e. GSH). In the present study, experiments were conducted to investigate the feasibility of these hypotheses. In hepatocytes preincubated for 48 hr with ethanol, neither significant changes in cocaine metabolism nor cytotoxicity were found despite differences in hepatocyte p-nitrophenol hydroxylase (largely CYP2E1 activity). Cocaethylene, the transesterification product of cocaine and ethanol, was found to be more toxic than cocaine for human hepatocytes (3x). However, the small amount formed when human hepatocytes were incubated with cocaine and ethanol would hardly explain the increased toxicity observed. On the other hand, the simultaneous presence of cocaine and ethanol caused a sustained decline in the intracellular GSH content that was larger than that observed in cocaine- or ethanol-treated cultures. Parallel to this phenomenon, a significant increase in lipid peroxidation was observed, as compared to cells treated with equimolar amounts of cocaine, ethanol, or cocaethylene. Finally, depletion of hepatocyte GSH with diethylmaleate down to levels similar to those found in ethanol-treated cells made hepatocytes more susceptible to cocaine. Taken together, the results of this research suggest that by decreasing GSH levels, ethanol makes human hepatocytes more sensitive to cocaine-induced oxidative damage.
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Affiliation(s)
- X Ponsoda
- Unidad de Hepatología Experimental, Centro de Investigación, Hospital La Fe, Valencia, Spain
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48
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Donato MT, Castell JV, Gómez-Lechón MJ. Characterization of drug metabolizing activities in pig hepatocytes for use in bioartificial liver devices: comparison with other hepatic cellular models. J Hepatol 1999; 31:542-9. [PMID: 10488716 DOI: 10.1016/s0168-8278(99)80049-x] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
BACKGROUND/AIMS The pig is considered the best donor of hepatocytes for bioartificial liver devices, but little is known about the metabolic capability of pig hepatocytes. Therefore, we have evaluated drug metabolizing activities in pig hepatocytes and liver microsomes and compared the results with those of man and other animal hepatic cellular models that are potential sources of cells for bioreactors, such as rat, rabbit and dog hepatocytes and hepatoma cell lines. METHODS Total cytochrome P450 levels, six phase 1 activities representative of the most relevant cytochrome P450 enzymes (7-ethoxycoumarin O-deethylase, 7-ethoxy-, 7-methoxy- and 7-benzoxyresorufin O-dealkylases, coumarin 7-hydroxylase and p-nitrophenol hydroxylase), two phase 2 activities (glutathione S-transferase and UDP-glucuronyltransferase) and CYP-dependent regioselective testosterone metabolism were evaluated in in vitro models of different species. RESULTS The pattern of specific cytochrome P450 activities and the metabolic profile of testosterone in intact hepatocytes were essentially the same as those measured in liver microsomes. Relatively low ethoxy-, methoxy-, and benzoxyresorufin O-dealkylation rates were found in pig liver microsomes and hepatocytes as compared to hepatic in vitro human models. However, in contrast with the other species studied, stereoselective testosterone oxidation profiles were practically identical in human and pig models. Finally, the metabolic capability of hepatoma cell lines was very limited in comparison with that of hepatocytes. CONCLUSIONS Pig hepatocytes are able to maintain in culture the phase 1 and phase 2 activities found in liver microsomes. The high metabolic similarities found between pig and human hepatocytes lend support to the use of pig hepatocytes in bioartificial liver devices.
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Affiliation(s)
- M T Donato
- Unidad de Hepatología Experimental, Centro de Investigación, Hospital Universitario La Fe, Valencia, Spain
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Ouedraogo G, Morlière P, Bazin M, Santus R, Kratzer B, Miranda MA, Castell JV. Lysosomes are sites of fluoroquinolone photosensitization in human skin fibroblasts: a microspectrofluorometric approach. Photochem Photobiol 1999; 70:123-9. [PMID: 10461453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
The fluoroquinolone antibiotics are widely used despite their strong phototoxicity under solar UV irradiation. Although they are known as good photodynamic photosensitizers, other factors than production of activated oxygen species may play a role in the effectiveness of the phototoxic effect. Subcellular localization is one of the important parameters that may determine this strength. Using microspectrofluorometry, it is shown that norfloxacin, ofloxacin, lomefloxacin, ciproflaxin and BAYy3118 are readily incorporated into lysosomes of HS68 human skin fibroblasts although weak staining of the whole cytoplasm also occurs especially with norfloxacin. Consistent with their photoinstability in solutions, the fluoroquinolones under study are readily photobleached by UVA in the HS68 fibroblasts. The BAYy3118 derivative that has the fastest bleaching rate also shows the strongest phototoxicity toward HS68 fibroblasts. Photosensitization with these fluoroquinolones induces lysosomal membrane damage as shown by the increased rate of leakage of the lysosomal probe lucifer yellow as compared to that observed with untreated cells.
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Affiliation(s)
- G Ouedraogo
- Muséum National d'Histoire Naturelle, Laboratoire de Photobiologie, Paris, France
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Ouedraogo G, Morliere P, Bazin M, Santus R, Kratzer B, Miranda MA, Castell JV. Lysosomes Are Sites of Fluoroquinolone Photosensitization in Human Skin Fibroblasts: A Microspectrofluorometric Approach*. Photochem Photobiol 1999. [DOI: 10.1111/j.1751-1097.1999.tb07979.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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