1
|
Navarro JM, Cárdenas L, Ortiz A, Figueroa Á, Morley SA, Vargas-Chacoff L, Leclerc JC, Détrée C. Testing the physiological capacity of the mussel Mytilus chilensis to establish into the Southern Ocean. Sci Total Environ 2024; 921:170941. [PMID: 38360303 DOI: 10.1016/j.scitotenv.2024.170941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 02/01/2024] [Accepted: 02/10/2024] [Indexed: 02/17/2024]
Abstract
The Southern Ocean and the Antarctic Circumpolar Current create environmental conditions that serve as an efficient barrier to prevent the colonization of non-native species (NNS) in the marine ecosystems of Antarctica. However, warming of the Southern Ocean and the increasing number of transport opportunities are reducing the physiological and physical barriers, increasing the chances of NNS arriving. The aim of this study was to determine the limits of survival of the juvenile mussels, M. chilensis, under current Antarctic conditions and those projected under climate change. These assessments were used to define the mussels potential for establishment in the Antarctic region. Experimental mussels were exposed to four treatments: -1.5 °C (Antarctic winter), 2 °C (Antarctic summer), 4 °C (Antarctic projected) and 8 °C (control) for 80 days and a combination of physiological and transcriptomics approaches were used to investigate mussel response. The molecular responses of mussels were congruent with the physiological results, revealing tolerance to Antarctic winter temperatures. However, a higher number of regulated differentially expressed gene (DEGs) were reported in mussels exposed to Antarctic winter temperatures (-1.5 °C). This tolerance was associated with the activation of the biological processes associated with apoptosis (up regulated) and both cell division and cilium assembly (down regulated). The reduced feeding rate and the negative scope for growth, for a large part of the exposure period at -1.5 °C, suggests that Antarctic winter temperatures represents an environmental barrier to M. chilensis from the Magellanic region settling in the Antarctic. Although M. chilensis are not robust to current Antarctica thermal conditions, future warming scenarios are likely to weaken these physiological barriers. These results strongly suggest that the West Antarctic Peninsula could become part of Mytilus distributional range, especially with dispersal aided by increasing maritime transport activity across the Southern Ocean.
Collapse
Affiliation(s)
- Jorge M Navarro
- Instituto de Ciencias Marinas y Limnológicas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile; Centro FONDAP de Investigación en Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL), Punta Arenas, Chile.
| | - Leyla Cárdenas
- Instituto de Ciencias Ambientales y Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
| | - Alejandro Ortiz
- Centro FONDAP de Investigación en Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL), Punta Arenas, Chile
| | - Álvaro Figueroa
- Instituto de Ciencias Ambientales y Evolutivas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
| | - Simon A Morley
- British Antarctic Survey, Natural Environment Research Council, Cambridge, United Kingdom
| | - Luis Vargas-Chacoff
- Instituto de Ciencias Marinas y Limnológicas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile; Centro FONDAP de Investigación en Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL), Punta Arenas, Chile; Millenium Institute Biodiversity of Antarctic and Subantarctic Ecosystems, BASE, Universidad Austral d Chile, Valdivia, Chile
| | - Jean-Charles Leclerc
- Sorbonne Université, CNRS, UMR 7144 AD2M, Station Biologique de Roscoff, Place Georges Teissier, 29680 Roscoff, France
| | - Camille Détrée
- Laboratoire de Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) Université de Caen-Normandie, CREC marine station, 54 rue du Docteur Charcot, 14530 Luc-sur-mer, France
| |
Collapse
|
2
|
Détrée C, Navarro JM, Garrido I, Bruning P, Leclerc JC. Evaluation of Sub-Antarctic and Antarctic sea urchins' thermal reaction norm through righting behavior and comparison with in situ measurements. J Therm Biol 2023; 112:103496. [PMID: 36796881 DOI: 10.1016/j.jtherbio.2023.103496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 01/25/2023] [Accepted: 01/26/2023] [Indexed: 02/05/2023]
Abstract
Sea urchin's survival may depend on their capacity to recover proper orientation rapidly and effectively after inversion, enabling escape from predator and preventing desiccation. This righting behavior has been used as a repeatable and reliable indicator to assess echinoderms performance across environmental conditions, including thermal sensitivity and thermal stress. The current study aims at evaluating and comparing the thermal reaction norm for righting behavior (time for righting (TFR) and capacity to self-right) of three common sea urchins from high latitude, the Patagonian sea urchins Loxechinus albus and Pseudechinus magellanicus, and the Antarctic sea urchin Sterechinus neumayeri. In addition, to infer the ecological implications of our experiments, we compared laboratory-based and in situ TFR of these three species. We observed that populations of the Patagonian sea urchins L. albus and P. magellanicus presented similar trend of righting behavior, overly accelerating with increasing temperature (from 0 to 22°C). Little variations and high inter-individual variability were observed below 6°C in the Antarctic sea urchin TFR, and righting success strongly decreased between 7 and 11°C. For the three species, TFR was lower in in situ experiments compared to the laboratory. Overall, our results suggest that the populations of Patagonian sea urchin exhibit a wide thermal tolerance and, based on S. neumayeri's TFR, aligning with the narrow thermal tolerance of Antarctic benthos. Finally, the differences between laboratory and in situ experiments highlights the importance of considering the complexity of marine environments for future predictions.
Collapse
Affiliation(s)
- Camille Détrée
- Centro FONDAP de Investigación en Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL), Valdivia, Chile; Instituto Ciencias Marinas y Limnológicas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile.
| | - Jorge M Navarro
- Centro FONDAP de Investigación en Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL), Valdivia, Chile; Instituto Ciencias Marinas y Limnológicas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile
| | - Ignacio Garrido
- Centro FONDAP de Investigación en Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL), Valdivia, Chile; Laboratorio Costero de Recursos Acuaticos de Calfuco (LCRAC), Instituto Ciencias Marinas y Limnológicas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile; Department of Biology and Quebec-Ocean Institute, Laval University, Québec, QC, Canada
| | - Paulina Bruning
- Centro FONDAP de Investigación en Dinámica de Ecosistemas Marinos de Altas Latitudes (IDEAL), Valdivia, Chile; Laboratorio Costero de Recursos Acuaticos de Calfuco (LCRAC), Instituto Ciencias Marinas y Limnológicas, Facultad de Ciencias, Universidad Austral de Chile, Valdivia, Chile; Department of Biology and Quebec-Ocean Institute, Laval University, Québec, QC, Canada
| | - Jean-Charles Leclerc
- Sorbonne Université, CNRS, UMR 7144 AD2M, Station Biologique de Roscoff, Place Georges Teissier, 29680, Roscoff, France
| |
Collapse
|
3
|
Ashton GV, Freestone AL, Duffy JE, Torchin ME, Sewall BJ, Tracy B, Albano M, Altieri AH, Altvater L, Bastida-Zavala R, Bortolus A, Brante A, Bravo V, Brown N, Buschmann AH, Buskey E, Barrera RC, Cheng B, Collin R, Coutinho R, De Gracia L, Dias GM, DiBacco C, Flores AAV, Haddad MA, Hoffman Z, Erquiaga BI, Janiak D, Campeán AJ, Keith I, Leclerc JC, Lecompte-Pérez OP, Longo GO, Matthews-Cascon H, McKenzie CH, Miller J, Munizaga M, Naval-Xavier LPD, Navarrete SA, Otálora C, Palomino-Alvarez LA, Palomo MG, Patrick C, Pegau C, Pereda SV, Rocha RM, Rumbold C, Sánchez C, Sanjuan-Muñoz A, Schlöder C, Schwindt E, Seemann J, Shanks A, Simoes N, Skinner L, Suárez-Mozo NY, Thiel M, Valdivia N, Velez-Zuazo X, Vieira EA, Vildoso B, Wehrtmann IS, Whalen M, Wilbur L, Ruiz GM. Predator control of marine communities increases with temperature across 115 degrees of latitude. Science 2022; 376:1215-1219. [PMID: 35679394 DOI: 10.1126/science.abc4916] [Citation(s) in RCA: 5] [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: 12/29/2022]
Abstract
Early naturalists suggested that predation intensity increases toward the tropics, affecting fundamental ecological and evolutionary processes by latitude, but empirical support is still limited. Several studies have measured consumption rates across latitude at large scales, with variable results. Moreover, how predation affects prey community composition at such geographic scales remains unknown. Using standardized experiments that spanned 115° of latitude, at 36 nearshore sites along both coasts of the Americas, we found that marine predators have both higher consumption rates and consistently stronger impacts on biomass and species composition of marine invertebrate communities in warmer tropical waters, likely owing to fish predators. Our results provide robust support for a temperature-dependent gradient in interaction strength and have potential implications for how marine ecosystems will respond to ocean warming.
Collapse
Affiliation(s)
- Gail V Ashton
- Smithsonian Environmental Research Center, Tiburon, CA and Edgewater, MD, USA
| | - Amy L Freestone
- Smithsonian Environmental Research Center, Tiburon, CA and Edgewater, MD, USA.,Department of Biology, Temple University, Philadelphia, PA, USA.,Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama
| | - J Emmett Duffy
- Tennenbaum Marine Observatories Network and MarineGEO program, Smithsonian Institution, Edgewater, MD, USA
| | - Mark E Torchin
- Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama.,Marine Science Institute, University of California, Santa Barbara, CA, USA
| | - Brent J Sewall
- Department of Biology, Temple University, Philadelphia, PA, USA
| | - Brianna Tracy
- Smithsonian Environmental Research Center, Tiburon, CA and Edgewater, MD, USA.,United States Naval Academy Oceanography Department, Annapolis, MD, USA
| | - Mariano Albano
- Centro Austral de Investigaciones Científicas (CADIC-CONICET), Ushuaia, Tierra del Fuego, Argentina
| | - Andrew H Altieri
- Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama.,Department of Environmental Engineering Sciences, Engineering School of Sustainable Infrastructure and Environment, University of Florida, Gainesville, FL, USA
| | - Luciana Altvater
- Department of Marine Biotechnology, Instituto de Estudos do Mar Almirante Paulo Moreira, Arraial do Cabo, RJ, Brazil
| | - Rolando Bastida-Zavala
- Laboratorio de Sistemática de Invertebrados Marinos (LABSIM), Universidad del Mar, campus Puerto Angel, Oaxaca, Mexico
| | - Alejandro Bortolus
- Instituto Patagónico para el Estudio de los Ecosistemas Continentales (IPEEC-CONICET), Puerto Madryn, Chubut, Argentina
| | - Antonio Brante
- Departamento de Ecología, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Concepción, Chile.,Centro de Investigación en Biodiversidad y Ambientes Sustenables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Viviana Bravo
- Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama
| | - Norah Brown
- Hakai Institute, Heriot Bay, BC, Canada.,School of Environmental Studies, University of Victoria, Victoria, BC, Canada
| | | | - Edward Buskey
- Mission-Aransas NERR, University of Texas Marine Science Institute, Port Aransas, TX, USA
| | | | - Brian Cheng
- Gloucester Marine Station, Department of Environmental Conservation, University of Massachusetts, Amherst, MA, USA
| | - Rachel Collin
- Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama
| | - Ricardo Coutinho
- Department of Marine Biotechnology, Instituto de Estudos do Mar Almirante Paulo Moreira, Arraial do Cabo, RJ, Brazil
| | - Luis De Gracia
- Departamento de Ecología, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Concepción, Chile.,Centro de Investigación en Biodiversidad y Ambientes Sustenables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Gustavo M Dias
- Universidade Federal do ABC, São Bernardo do Campo, SP, Brazil
| | - Claudio DiBacco
- Bedford Institute of Oceanography, Fisheries and Oceans Canada, Dartmouth, NS, Canada
| | - Augusto A V Flores
- Centre for Marine Biology, University of São Paulo, São Sebastião, SP, Brazil
| | | | - Zvi Hoffman
- Departamento de Ciencias Marinas y Costeras, Universidad Autónoma de Baja California Sur, La Paz, BCS, Mexico
| | | | - Dean Janiak
- Smithsonian Marine Station, Fort Pierce, FL, USA
| | - Analí Jiménez Campeán
- Laboratorio MARINAR, Facultad de Ciencias Biológicas, Universidad Nacional Mayor de San Marcos, Lima, Peru.,Asociacion Conservaccion, Lima, Peru
| | - Inti Keith
- Charles Darwin Research Station, Charles Darwin Foundation, Santa Cruz, Galapagos, Ecuador
| | - Jean-Charles Leclerc
- Departamento de Ecología, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Concepción, Chile.,Centro FONDAP de Investigación de Dinámicas de Ecosistemas Marinos de Altas Latitudes (IDEAL), Chile
| | | | | | | | - Cynthia H McKenzie
- Northwest Atlantic Fisheries Centre, Fisheries and Oceans Canada, St. John's, NL Canada
| | - Jessica Miller
- Oregon State University, Coastal Oregon Marine Experiment Station, Newport, OR, USA
| | - Martín Munizaga
- Facultad de Ciencias del Mar, Universidad Católica del Norte, Coquimbo, Chile.,Millennium Nucleus Ecology and Sustainable Management of Oceanic Island (ESMOI), Coquimbo, Chile.,Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Coquimbo, Chile
| | - Lais P D Naval-Xavier
- Department of Marine Biotechnology, Instituto de Estudos do Mar Almirante Paulo Moreira, Arraial do Cabo, RJ, Brazil
| | - Sergio A Navarrete
- Estación Costera de Investigaciones Marinas, Pontificia Universidad Católica de Chile, Las Cruces, Chile
| | - Carlos Otálora
- Facultad de Ciencias Naturales e Ingeniería, Universidad Jorge Tadeo Lozano, Santa Marta, Colombia
| | - Lilian A Palomino-Alvarez
- Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México (UNAM), Ciudad de México, México.,Unidad Multidisciplinaria de Docencia e Investigación Sisal (UMDI-SISAL), Facultad de Ciencias, Universidad Nacional Autónoma de México (UNAM), Yucatán, México
| | | | - Chris Patrick
- Virginia Institute of Marine Science, College of William and Mary, VA, USA
| | - Cormack Pegau
- Oil Spill Recovery Institute/PWSSC, Cordova, AK, USA
| | - Sandra V Pereda
- Centro i-mar and CeBiB, Universidad de Los Lagos, Puerto Montt, Chile
| | - Rosana M Rocha
- Zoology Department, University Federal do Paraná, Curitiba, PR, Brazil
| | - Carlos Rumbold
- CIT Santa Cruz (CONICET-UNPA), IlMyC (CONICET-FCEyN, UNMdP), Argentina
| | - Carlos Sánchez
- Departamento de Ciencias Marinas y Costeras, Universidad Autónoma de Baja California Sur, La Paz, BCS, Mexico
| | - Adolfo Sanjuan-Muñoz
- Facultad de Ciencias Naturales e Ingeniería, Universidad Jorge Tadeo Lozano, Santa Marta, Colombia
| | - Carmen Schlöder
- Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama
| | - Evangelina Schwindt
- Instituto de Biología de Organismos Marinos (IBIOMAR-CONICET), Puerto Madryn, Chubut, Argentina
| | - Janina Seemann
- Smithsonian Tropical Research Institute, Balboa, Ancon, Republic of Panama.,Zukunft Umwelt Gesellschaft (ZUG) gGmbH, International Climate Initiative, Berlin, Germany
| | - Alan Shanks
- University of Oregon, Oregon Institute of Marine Biology, Charleston, OR, USA
| | - Nuno Simoes
- Unidad Multidisciplinaria de Docencia e Investigación Sisal (UMDI-SISAL), Facultad de Ciencias, Universidad Nacional Autónoma de México (UNAM), Yucatán, México.,Laboratorio Nacional de Resiliencia Costera (LANRESC), CONACYT, Sisal, Yucatan, Mexico.,International Chair for Ocean and Coastal Studies, Harte Research Institute, Texas A&M University at Corpus Christi (TAMUCC), Corpus Christi, Texas, USA
| | - Luis Skinner
- Universidade do Estado do Rio de Janeiro, Brazil
| | - Nancy Yolimar Suárez-Mozo
- Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México (UNAM), Ciudad de México, México.,Unidad Multidisciplinaria de Docencia e Investigación Sisal (UMDI-SISAL), Facultad de Ciencias, Universidad Nacional Autónoma de México (UNAM), Yucatán, México
| | - Martin Thiel
- Facultad de Ciencias del Mar, Universidad Católica del Norte, Coquimbo, Chile.,Millennium Nucleus Ecology and Sustainable Management of Oceanic Island (ESMOI), Coquimbo, Chile.,Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Coquimbo, Chile
| | - Nelson Valdivia
- Centro FONDAP de Investigación de Dinámicas de Ecosistemas Marinos de Altas Latitudes (IDEAL), Chile.,Instituto de Ciencias Marinas y Limnológicas, Facultad de Ciencias, Universidad Austral de Chile, Campus Isla Teja, Valdivia, Chile
| | - Ximena Velez-Zuazo
- Center for Conservation and Sustainability, Smithsonian Conservation Biology Institute, National Zoological Park, Washington, DC, USA
| | - Edson A Vieira
- Departamento de Oceanografia e Limnologia, Federal University of Rio Grande do Norte, Brazil
| | | | - Ingo S Wehrtmann
- Centro de Investigación en Ciencias del Mar y Limnología (CIMAR), San José, Costa Rica
| | - Matt Whalen
- Tennenbaum Marine Observatories Network and MarineGEO program, Smithsonian Institution, Edgewater, MD, USA.,Hakai Institute, Heriot Bay, BC, Canada.,Biodiversity Research Centre, University of British Columbia, BC, Canada
| | - Lynn Wilbur
- University of Aberdeen, Oceanlab, Aberdeen, Scotland
| | - Gregory M Ruiz
- Smithsonian Environmental Research Center, Tiburon, CA and Edgewater, MD, USA
| |
Collapse
|
4
|
Figueroa NN, Brante A, Viard F, Leclerc JC. Greater functional similarity in mobile compared to sessile assemblages colonizing artificial coastal habitats. Mar Pollut Bull 2021; 172:112844. [PMID: 34399279 DOI: 10.1016/j.marpolbul.2021.112844] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 08/04/2021] [Accepted: 08/08/2021] [Indexed: 06/13/2023]
Abstract
Among anthropogenic habitats built in the marine environment, floating and non-floating structures can be colonized by distinct assemblages. However, there is little knowledge whether these differences are also reflected in the functional structure. This study compared the functional diversity of sessile and mobile invertebrate assemblages that settle over three months on floating vs. non-floating artificial habitats, in two Chilean ports. Using morphological, trophic, behavioral, and life history traits, we found differences between mobile and sessile assemblages regarding the effect of the type of habitat on the functional diversity. Compared to sessile assemblages, a greater functional similarity was observed for mobile assemblages, which suggests that their dispersal capacity enables them to balance the reduced connectivity between settlement structures. No traits, prevailing or selected in one or the other habitat type, was however clearly identified; a result warranting for further studies focusing on more advanced stages of community development.
Collapse
Affiliation(s)
- Naily Nashira Figueroa
- Universidad Católica de la Santísima Concepción, Departamento de Ecología, Facultad de Ciencias, Concepción, Chile
| | - Antonio Brante
- Universidad Católica de la Santísima Concepción, Departamento de Ecología, Facultad de Ciencias, Concepción, Chile; Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Frédérique Viard
- ISEM, Université de Montpellier, CNRS, EPHE, IRD, Montpellier, France
| | - Jean-Charles Leclerc
- Universidad Católica de la Santísima Concepción, Departamento de Ecología, Facultad de Ciencias, Concepción, Chile; Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile; Sorbonne Université, CNRS, UMR 7144 AD2M, Station Biologique de Roscoff, Place Georges Teissier, 29680 Roscoff, France.
| |
Collapse
|
5
|
Leclerc JC, de Bettignies T, de Bettignies F, Christie H, Franco JN, Leroux C, Davoult D, Pedersen MF, Filbee-Dexter K, Wernberg T. Local flexibility in feeding behaviour and contrasting microhabitat use of an omnivore across latitudes. Oecologia 2021; 196:441-453. [PMID: 34009471 DOI: 10.1007/s00442-021-04936-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Accepted: 05/03/2021] [Indexed: 10/21/2022]
Abstract
As the environment is getting warmer and species are redistributed, consumers can be forced to adjust their interactions with available prey, and this could have cascading effects within food webs. To better understand the capacity for foraging flexibility, our study aimed to determine the diet variability of an ectotherm omnivore inhabiting kelp forests, the sea urchin Echinus esculentus, along its entire latitudinal distribution in the northeast Atlantic. Using a combination of gut content and stable isotope analyses, we determined the diet and trophic position of sea urchins at sites in Portugal (42° N), France (49° N), southern Norway (63° N), and northern Norway (70° N), and related these results to the local abundance and distribution of putative food items. With mean estimated trophic levels ranging from 2.4 to 4.6, omnivory and diet varied substantially within and between sites but not across latitudes. Diet composition generally reflected prey availability within epiphyte or understorey assemblages, with local affinities demonstrating that the sea urchin adjusts its foraging to match the small-scale distribution of food items. A net "preference" for epiphytic food sources was found in northern Norway, where understorey food was limited compared to other regions. We conclude that diet change may occur in response to food source redistribution at multiple spatial scales (microhabitats, sites, regions). Across these scales, the way that key consumers alter their foraging in response to food availability can have important implication for food web dynamics and ecosystem functions along current and future environmental gradients.
Collapse
Affiliation(s)
- Jean-Charles Leclerc
- Sorbonne Université, CNRS, UMR 7144 AD2M, Station Biologique de Roscoff, Place Georges Teissier, 29680, Roscoff, France. .,Departamento de Ecología, Facultad de Ciencias, Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Casilla 297, Concepción, Chile.
| | - Thibaut de Bettignies
- UMS Patrimoine Naturel (PATRINAT), AFB-CNRS-MNHN, CP41, 36 rue Geoffroy Saint-Hilaire, 75005, Paris, France.,School of Biological Sciences and UWA Oceans Institute, University of Western Australia, 39 Fairway, Crawley, WA, 6009, Australia
| | - Florian de Bettignies
- Sorbonne Université, CNRS, UMR 7144 AD2M, Station Biologique de Roscoff, Place Georges Teissier, 29680, Roscoff, France
| | - Hartvig Christie
- Marine Biology Section, Norwegian Institute for Water Research, Oslo, Norway
| | - João N Franco
- CIIMAR, Terminal de Cruzeiros de Leixões. Av. General Norton de Matos, 4450-208, Matosinhos, Portugal.,MARE-Marine and Environmental Sciences Centre, ESTM, Instituto Politécnico de Leiria, Peniche, Portugal
| | - Cédric Leroux
- Sorbonne Université, CNRS, FR 2424, Station Biologique, Place Georges Teissier, 29680, Roscoff, France
| | - Dominique Davoult
- Sorbonne Université, CNRS, UMR 7144 AD2M, Station Biologique de Roscoff, Place Georges Teissier, 29680, Roscoff, France
| | - Morten F Pedersen
- Department for Science and Environment (DSE), Roskilde University, PO Box 260, 4000, Roskilde, Denmark
| | - Karen Filbee-Dexter
- School of Biological Sciences and UWA Oceans Institute, University of Western Australia, 39 Fairway, Crawley, WA, 6009, Australia.,Benthic Communities Research Group, Institute of Marine Research, His, Norway
| | - Thomas Wernberg
- School of Biological Sciences and UWA Oceans Institute, University of Western Australia, 39 Fairway, Crawley, WA, 6009, Australia.,Department for Science and Environment (DSE), Roskilde University, PO Box 260, 4000, Roskilde, Denmark.,Benthic Communities Research Group, Institute of Marine Research, His, Norway
| |
Collapse
|
6
|
Leclerc JC, Brante A, Viard F. Rapid recovery of native habitat-builders following physical disturbance on pier pilings offsets colonization of cryptogenic and non-indigenous species in a Chilean port. Mar Environ Res 2021; 163:105231. [PMID: 33302154 DOI: 10.1016/j.marenvres.2020.105231] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 11/09/2020] [Accepted: 11/30/2020] [Indexed: 06/12/2023]
Abstract
Examining the effects of disturbances within marine urban communities can shed light on their assembly rules and invasion processes. The effects of physical disturbance, through the removal of dominant native habitat-builders, were investigated in the recolonization of disturbed patches and colonization of plates on pier pilings, in a Chilean port. On pilings, disturbance substantially affected community structure after 3 months, although it slowly converged across treatments after 10 months. On plates, cryptogenic and non-indigenous species richness increased with removal severity, which was not observed in natives. Opportunistic taxa took advantage of colonizing at an early successional stage, illustrating a competition-colonization trade-off, although indirect effects might be at play (e.g. trophic competition or selective predation). Recovery of the habitat-builders then occurred at the expense of cryptogenic and non-indigenous taxa. Whether natives could continue winning against increasing propagule and colonization pressures in marine urban habitats deserves further attention. The interactions between disturbance and biological invasions herein experimentally shown in situ contribute to our understanding of multiple changes imposed by marine urbanization in a growing propagule transport network.
Collapse
Affiliation(s)
- Jean-Charles Leclerc
- Universidad Católica de la Santísima Concepción, Departamento de Ecología, Facultad de Ciencias, Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Casilla 297, Concepción, Chile; Sorbonne Université, CNRS, UMR 7144 AD2M, Station Biologique de Roscoff, Place Georges Teissier, 29680, Roscoff, France.
| | - Antonio Brante
- Universidad Católica de la Santísima Concepción, Departamento de Ecología, Facultad de Ciencias, Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Casilla 297, Concepción, Chile
| | - Frédérique Viard
- Sorbonne Université, CNRS, UMR 7144 AD2M, Station Biologique de Roscoff, Place Georges Teissier, 29680, Roscoff, France; ISEM, Université de Montpellier, CNRS, EPHE, IRD, Montpellier, France
| |
Collapse
|
7
|
|
8
|
Leclerc JC, Viard F, González Sepúlveda E, Díaz C, Neira Hinojosa J, Pérez Araneda K, Silva F, Brante A. Non-indigenous species contribute equally to biofouling communities in international vs local ports in the Biobío region, Chile. Biofouling 2018; 34:784-799. [PMID: 30354802 DOI: 10.1080/08927014.2018.1502276] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 07/13/2018] [Indexed: 06/08/2023]
Abstract
Growing coastal urbanization together with the intensification of maritime traffic are major processes explaining the increasing rate of biological introductions in marine environments. To investigate the link between international maritime traffic and the establishment of non-indigenous species (NIS) in coastal areas, biofouling communities in three international and three nearby local ports along 100 km of coastline in south-central Chile were compared using settlement panels and rapid assessment surveys. A larger number of NIS was observed in international ports, as expected in these 'invasion hubs'. However, despite a few environmental differences between international and local ports, the two port categories did not display significant differences regarding NIS establishment and contribution to community structure over the studied period (1.5 years). In international ports, the free space could be a limiting factor for NIS establishment. The results also suggest that local ports should be considered in NIS surveillance programs in Chile.
Collapse
Affiliation(s)
- Jean-Charles Leclerc
- a Departamento de Ecología, Facultad de Ciencias, Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS) , Universidad Católica de la Santísima Concepción , Concepción , Chile
| | - Frédérique Viard
- b CNRS, UMR 7144 AD2M, Station Biologique de Roscoff, Place Georges Teissier , Sorbonne Université , Roscoff , France
| | - Elizabeth González Sepúlveda
- c Departmento de Química Ambiental, Facultad de Ciencias , Universidad Católica de la Santísima Concepción , Concepción , Chile
| | - Christian Díaz
- d Departamento de Medio Ambiente y Energía, Facultad de Ingeniería, Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS) , Universidad Católica de la Santísima Concepción , Concepción , Chile
| | - José Neira Hinojosa
- e Departamento de Análisis Instrumental, Facultad de Farmacia , Universidad de Concepción , Concepción , Chile
| | - Karla Pérez Araneda
- a Departamento de Ecología, Facultad de Ciencias, Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS) , Universidad Católica de la Santísima Concepción , Concepción , Chile
| | - Francisco Silva
- a Departamento de Ecología, Facultad de Ciencias, Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS) , Universidad Católica de la Santísima Concepción , Concepción , Chile
| | - Antonio Brante
- a Departamento de Ecología, Facultad de Ciencias, Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS) , Universidad Católica de la Santísima Concepción , Concepción , Chile
| |
Collapse
|
9
|
Leclerc JC, Viard F. Habitat formation prevails over predation in influencing fouling communities. Ecol Evol 2017; 8:477-492. [PMID: 29321887 PMCID: PMC5756867 DOI: 10.1002/ece3.3654] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Revised: 10/20/2017] [Accepted: 11/03/2017] [Indexed: 01/06/2023] Open
Abstract
Coastal human‐made structures, such as marinas and harbors, are expanding worldwide. Species assemblages described from these artificial habitats are novel relative to natural reefs, particularly in terms of the abundance of nonindigenous species (NIS). Although these fouling assemblages are clearly distinctive, the ecosystem functioning and species interactions taking place there are little understood. For instance, large predators may influence the fouling community development either directly (feeding on sessile fauna) or indirectly (feeding on small predators associated with these assemblages). In addition, by providing refuges, habitat complexity may modify the outcome of species interactions and the extent of biotic resistance (e.g., by increasing the abundance of niche‐specific competitors and predators of NIS). Using experimental settlement panels deployed in the field for 2.5 months, we tested the influence of predation (i.e., caging experiment), artificial structural complexity (i.e., mimics of turf‐forming species), and their interactions (i.e., refuge effects) on the development of sessile and mobile fauna in two marinas. In addition, we tested the role of biotic complexity—arising from the habitat‐forming species that grew on the panels during the trial—on the richness and abundance of mobile fauna. The effect of predation and artificial habitat complexity was negligible, regardless of assemblage status (i.e., native, cryptogenic, and nonindigenous). Conversely, habitat‐forming species and associated epibionts, responsible for biotic complexity, had a significant effect on mobile invertebrates (richness, abundance, and community structure). In particular, the richness and abundance of mobile NIS were positively affected by biotic complexity, with site‐dependent relationships. Altogether, our results indicate that biotic complexity prevails over artificial habitat complexity in determining the distribution of mobile species under low predation pressure. Facilitation of native and non‐native species thus seems to act upon diversity and community development: This process deserves further consideration in models of biotic resistance to invasion in urban marine habitats.
Collapse
Affiliation(s)
- Jean-Charles Leclerc
- UMR 7144 AD2M, Station Biologique de Roscoff Sorbonne Universités, UPMC Univ Paris 06, CNRS Roscoff France.,Departamento de Ecología Facultad de Ciencias CIBAS Universidad Católica de la Santísima Concepción Concepción Chile
| | - Frédérique Viard
- UMR 7144 AD2M, Station Biologique de Roscoff Sorbonne Universités, UPMC Univ Paris 06, CNRS Roscoff France
| |
Collapse
|
10
|
Pinochet J, Leclerc JC, Brante A, Daguin-Thiébaut C, Díaz C, Tellier F, Viard F. Presence of the tunicate Asterocarpa humilis on ship hulls and aquaculture facilities in the coast of the Biobío Region, south central Chile. PeerJ 2017; 5:e3672. [PMID: 28828267 PMCID: PMC5560234 DOI: 10.7717/peerj.3672] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 07/21/2017] [Indexed: 01/20/2023] Open
Abstract
Non-native ascidians are important members of the fouling community associated with artificial substrata and man-made structures. Being efficient fouling species, they are easily spread by human-mediated transports (e.g., with aquaculture trade and maritime transports). This is exemplified by the ascidian Asterocarpa humilis which displays a wide distribution in the Southern Hemisphere and has been recently reported in the Northern Hemisphere (NW Europe). In continental Chile, its first report dates back from 2000 for the locality of Antofagasta (23°S). Although there was no evidence about the vectors of introduction and spread, nor the source, some authors suggested maritime transport by ship hulls and aquaculture devices as putative introduction pathways and vectors. In the present study, we report for the first time the presence of A. humilis on the hull of an international ship in a commercial port in Concepción bay (36°S), south central Chile. We also found one individual associated to a seashell farm, 70 km far from Concepción bay. Further individuals were subsequently identified within Concepción bay: one juvenile settled upon international harbor pilings and a dozen individuals along aquaculture seashell longlines. For the first specimens sampled, species identification was ascertained using both morphological criteria and molecular barcoding, using the mitochondrial gene cytochrome c oxidase subunit I (COI) and a nuclear gene (ribosomal RNA 18S). The nuclear 18S gene and the mitochondrial gene COI clearly assigned the specimens to A. humilis, confirming our morphological identification. Two haplotypes were obtained with COI corresponding to haplotypes previously obtained with European and Northern Chilean specimens. The present study thus reports for the first time the presence of A. humilis in the Araucanian ecoregion, documenting the apparent expansion of this non-native tunicate in Chile over 2,000 km, spanning over three ecoregions. In addition we reveal the potential implication of the international maritime transport as a vector of spread of this species along the Eastern Pacific coast, and the putative role of aquaculture facilities in promoting local establishments of non-native tunicates.
Collapse
Affiliation(s)
- Javier Pinochet
- Departamento de Ecología, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Concepción, Chile.,Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile.,Magíster en Ecología Marina, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Jean-Charles Leclerc
- Departamento de Ecología, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Concepción, Chile.,Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Antonio Brante
- Departamento de Ecología, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Concepción, Chile.,Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Claire Daguin-Thiébaut
- UMR 7144, Laboratoire "Adaptation et Diversité en Milieu Marin", Team Div&Co, Station Biologique de Roscoff, Sorbonne Universités, Université Pierre et Marie Curie (Paris VI), CNRS, Roscoff, France
| | - Christian Díaz
- Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile.,Departamento de Medio Ambiente y Energía, Facultad de Ingeniería, Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Florence Tellier
- Departamento de Ecología, Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Concepción, Chile.,Centro de Investigación en Biodiversidad y Ambientes Sustentables (CIBAS), Universidad Católica de la Santísima Concepción, Concepción, Chile
| | - Frédérique Viard
- UMR 7144, Laboratoire "Adaptation et Diversité en Milieu Marin", Team Div&Co, Station Biologique de Roscoff, Sorbonne Universités, Université Pierre et Marie Curie (Paris VI), CNRS, Roscoff, France
| |
Collapse
|
11
|
Bennett S, Wernberg T, de Bettignies T, Kendrick GA, Anderson RJ, Bolton JJ, Rodgers KL, Shears NT, Leclerc JC, Lévêque L, Davoult D, Christie HC. Canopy interactions and physical stress gradients in subtidal communities. Ecol Lett 2015; 18:677-86. [PMID: 25975532 DOI: 10.1111/ele.12446] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 12/15/2014] [Accepted: 04/07/2015] [Indexed: 11/28/2022]
Abstract
Species interactions are integral drivers of community structure and can change from competitive to facilitative with increasing environmental stress. In subtidal marine ecosystems, however, interactions along physical stress gradients have seldom been tested. We observed seaweed canopy interactions across depth and latitudinal gradients to test whether light and temperature stress structured interaction patterns. We also quantified interspecific and intraspecific interactions among nine subtidal canopy seaweed species across three continents to examine the general nature of interactions in subtidal systems under low consumer pressure. We reveal that positive and neutral interactions are widespread throughout global seaweed communities and the nature of interactions can change from competitive to facilitative with increasing light stress in shallow marine systems. These findings provide support for the stress gradient hypothesis within subtidal seaweed communities and highlight the importance of canopy interactions for the maintenance of subtidal marine habitats experiencing environmental stress.
Collapse
Affiliation(s)
- Scott Bennett
- School of Plant Biology & UWA Oceans Institute, University of Western Australia, 39 Fairway, Crawley, 6009, WA, Australia
| | - Thomas Wernberg
- School of Plant Biology & UWA Oceans Institute, University of Western Australia, 39 Fairway, Crawley, 6009, WA, Australia
| | - Thibaut de Bettignies
- School of Plant Biology & UWA Oceans Institute, University of Western Australia, 39 Fairway, Crawley, 6009, WA, Australia
| | - Gary A Kendrick
- School of Plant Biology & UWA Oceans Institute, University of Western Australia, 39 Fairway, Crawley, 6009, WA, Australia
| | - Robert J Anderson
- Seaweed Research Unit, Department of Agriculture, forestry and Fisheries, Pvt Bag X2, Roggebaai, 8012, South Africa
- Department of Biological Sciences and Marine Research Institute, University of Cape Town, Rondebosch, 7701, South Africa
| | - John J Bolton
- Department of Biological Sciences and Marine Research Institute, University of Cape Town, Rondebosch, 7701, South Africa
| | - Kirsten L Rodgers
- Leigh Marine Laboratory, Institute of Marine Science, University of Auckland, PO Box 349, Warkworth, 0941, New Zealand
| | - Nick T Shears
- Leigh Marine Laboratory, Institute of Marine Science, University of Auckland, PO Box 349, Warkworth, 0941, New Zealand
| | - Jean-Charles Leclerc
- Sorbonne Universités, UPMC Univ Paris 6, Station Biologique, Place Georges Teissier, Roscoff, 29680, France
- CNRS, Station Biologique, Place Georges Teissier, UMR 7144, Roscoff, 29680, France
| | - Laurent Lévêque
- Sorbonne Universités, UPMC Univ Paris 6, Station Biologique, Place Georges Teissier, Roscoff, 29680, France
- CNRS, FR 2424, Station Biologique, Place Georges Teissier, Roscoff, 29680, France
| | - Dominique Davoult
- Sorbonne Universités, UPMC Univ Paris 6, Station Biologique, Place Georges Teissier, Roscoff, 29680, France
- CNRS, Station Biologique, Place Georges Teissier, UMR 7144, Roscoff, 29680, France
| | - Hartvig C Christie
- Section for Marine Biology, Norwegian Institute for Water Research, Oslo, Norway
| |
Collapse
|
12
|
Abstract
Most inflammatory, infectious or tumoral diseases of the bowel and abdominal organs may secondarily involve the peritoneum which acts as a mirror of the diseases. Multidetector CT allows breathhold acquisitions through the abdomen and pelvis providing high spatial and contrast resolution imaging at all phases of contrast distribution as well as MPR and 3D capabilities.
Collapse
Affiliation(s)
- D Régent
- Service de Radiologie Adultes, Hôpital de Brabois, 54511 Vandoeuvre-Les-Nancy
| | | | | | | | | | | | | |
Collapse
|
13
|
Leclerc JC, Marchal F, Stines J, Régent D. [Epithelioid renal angiomyolipoma: benign or malignant tumor?]. J Radiol 2003; 84:851-4. [PMID: 13130237] [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] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
Abstract
Angiomyolipoma is a well-known rare soft tissue tumor involving the kidneys, liver and other organs. Long believed to be a benign hamartoma, angiomyolipoma is now considered a neoplasm that arises from perivascular epithelioid cell. Epithelioid angiomyolipoma is a rare variant of angiomyolipoma characterized by epithelioid cells that mimic renal cell carcinoma and is potentially malignant. Immunoreactivity with HMB45 is helpful for its identification. We report the computed tomographic and histologic findings in a 36 years old woman with epithelioid angiomyolipoma and lymph node involvement.
Collapse
Affiliation(s)
- J C Leclerc
- Service de Radiologie, hôpital d'adultes, CHU Nancy Brabois, 54500 Vandoeuvre les Nancy
| | | | | | | |
Collapse
|
14
|
Leclerc JC, Debelle L, Cannard L, Laurent V, Béot S, Régent D. [Quid. Alveolar microlithiasis]. J Radiol 2002; 83:659-60. [PMID: 12063432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Affiliation(s)
- J C Leclerc
- Service de Radiologie, Hôpital d'Adultes, CHU Nancy-Brabois, rue du Morvan, 54500 Vandoeuvre, France
| | | | | | | | | | | |
Collapse
|
15
|
Leclerc JC, Cannard L, Debelle L, Laurent V, Béot S, Régent D. [MRI of portal cavernoma with biliary involvement]. J Radiol 2002; 83:341-9. [PMID: 11979228] [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] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
PURPOSE To assess the value of MRI in the diagnosis of portal cavernoma with biliary obstruction. MATERIAL and methods: six patients referred for clinical suspicion of biliary obstruction and portal cavernoma were explored with MRI. all patients were explored using a signa 1.5 t GE MR unit, with high gradient field strength and torso phased array coil. Biliary ducts were explored with ss-fse sequences of MR-cholangiopancreatography (MRCP), coronal and oblique coronal 20mm thick slices. Then, coronal T2w with shorter TE eff, MR-angiography and delayed T1w sequences were performed. CT scan and sonographic examinations of the liver were performed in all patients. Two patients were operated on and 2 underwent endoscopic retrograde cholangiography. RESULTS Three different types of biliary involvement were found: in 3 cases findings that mimic cholangiocarcinoma spreading along the common bile duct and in 3 other cases multiple smooth extrinsic impressions along the common bile duct; in one patient MRCP demonstrated an irregular narrowing of the common bile duct mimicking chronic cholangitis. In all cases, the bile duct varices appeared of low T2W signal; in three cases, fibrosis was identified on delayed sequences. CONCLUSION MRCP and MR-angiography can be proposed as a first imaging study in patients with portal cavernoma and cholestasis or bile duct dilatation.
Collapse
Affiliation(s)
- J C Leclerc
- Service de radiologie, Hôpital d'adultes, CHU nancy-brabois, rue du morvan, 54500 vandoeuvre
| | | | | | | | | | | |
Collapse
|
16
|
Leclerc JC, Debelle L, Cannard L, Laurent V, Béot S, Régent D. [Pneumobilia and MRCP: value of sagittal view]. J Radiol 2002; 83:7-12. [PMID: 11965145] [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] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
Pneumobilia can lead to artifacts at MRCP obtained from thick coronal and coronal oblique slabs. Axial and sagittal images can both show gas bubbles in bile ducts but sagittal images depict more easily the presence of an air-fluid level.
Collapse
Affiliation(s)
- J C Leclerc
- Service de Radiologie, Hôpital d'Adultes, CHU Nancy-Brabois, rue du Morvan, 54500 Vandoeuvre, France
| | | | | | | | | | | |
Collapse
|
17
|
Abstract
Three new flavonol malonylrhamnosides, 3-O-(4"-O-malonyl)-alpha-L-rhamnopyranosides of mearnsetin, myricetin and quercetin respectively, together with the corresponding mearnsitrin, myricitrin, quercitrin and the 4-O-methyl phloracetophenone 2-O-beta-D-glucopyranoside, were isolated from the leaves of Ribes alpinum and fully characterized by spectrocopic methods including 2D NMR.
Collapse
Affiliation(s)
- K Gluchoff-Fiasson
- Laboratoire de Biologie Macromoléculaire et Phytochimie, UFR de Biologie, Université Lyon 1, Villeurbanne, France.
| | | | | | | | | | | |
Collapse
|
18
|
Nicolas M, Debelle L, Laurent V, Cannard L, Leclerc JC, Béot S, Régent D. [Incremental lower extremity CT venography, a simplified approach for the diagnosis of phlebitis in patients with pulmonary embolism]. J Radiol 2001; 82:251-6. [PMID: 11287856] [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] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
PURPOSE To demonstrate that incremental CT venography, performed at the time of CT pulmonary angiography, can easily diagnose deep venous thrombosis. Materials and Methods. Retrospective analysis of 152 combined incremental CT venography and CT pulmonary angiography. Results were compared to Doppler US examinations in 18 cases. RESULTS 61% of venous thrombosis was found on incremental CT examination in case of pulmonary embolism. In 5 cases, isolated venous thrombosis was found without pulmonary embolism. The CT diagnosis of DVT was confirmed by US; CT appeared more accurate than US in the calf. CONCLUSION CT venography combined with CT pulmonary angiography is a useful tool in order to obtain a comprehensive evaluation for thrombo-embolic disease.
Collapse
Affiliation(s)
- M Nicolas
- CHU de Nancy - Hôpitaux de Brabois, Service de Radiologie Adultes, Allée du Morvan, 54511 Vandoeuvre les Nancy Cedex
| | | | | | | | | | | | | |
Collapse
|
19
|
Leclerc JC, Cannard L, Lefèvre F, Debelle L, Béot S, Boccaccini H, Bazin C, Régent D. [Imaging of the intrahepatic biliary tree with thick slice MR cholangiography]. J Radiol 2001; 82:151-60. [PMID: 11428210] [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] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
PURPOSE To assess the value of single shot fast spin echo MR sequence (SS-FSE) in the evaluation of the normal and pathologic intrahepatic biliary tree. MATERIAL AND METHODS 418 consecutive patients (457 examinations) referred for clinical and/or biological suspicion of biliary obstruction underwent MR cholangiopancreatography (MRCP). All patients were imaged with a Signa 1.5 T GE MR unit, with High Gradient Field Strength and Torso Phased Array Coil. Biliary ducts were imaged with SS-FSE sequence, coronal and oblique coronal 20 mm thick slices on a 256 x 256 matrix. Total acquisition time was 1 second. Source images were reviewed by two radiologists blinded to clinical information. In case of disagreement, a third radiologist's opinion was requested. In all cases, MRCP results were compared with direct biliary tract evaluation, other imaging studies and clinical and biological follow-up. RESULTS In all cases, MRCP produced high quality images. Numerous branch of division were observed although the peripheral intrahepatic ducts were well seen in more than 90% in an area 2 cm below the capsule. The number of division was statistically higher when mechanical obstruction was present. Intrahepatic calculi or peripheral cholangiocarcinoma were well detect by MRCP. For the detection of cholangitis, MRCP sensitivity was 87.5% but the positive predictive value was only 57.7% because of a high number of false positive. The diagnosis of primary sclerosing cholangitis must be made only on strict criteria and slightly dilated peripheral bile ducts unconnected to the central ducts in several hepatic segments were a characteristic MR sign of primary sclerosing cholangitis. CONCLUSION MRCP can be proposed as a first intention imaging technique for the evaluation of intrahepatic ducts.
Collapse
Affiliation(s)
- J C Leclerc
- Service de Radiologie, Hôpital d'Adulte-CHU Nancy-Brabois, Rue du Morvan, 54511 Vandoeuvre
| | | | | | | | | | | | | | | |
Collapse
|
20
|
Naessens M, Leclerc JC, Tran-Minh C. Fiber optic biosensor using Chlorella vulgaris for determination of toxic compounds. Ecotoxicol Environ Saf 2000; 46:181-5. [PMID: 10831331 DOI: 10.1006/eesa.1999.1904] [Citation(s) in RCA: 39] [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] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A new biosensor is constructed for the detection of some herbicides based on kinetic measurements of chlorophyll-a fluorescence in Chlorella vulgaris cells. The microalgae are immobilized on removable membranes placed in front of the tip of an optical fiber bundle inside a homemade microcell. C. vulgaris was easily cultivated in laboratory and very sensitive to herbicides that effect the photosynthesis process. The response of the algal biosensor is studied in terms of detection limits, reversibility, and long-term activity. The effects of temperature and pH are also reported. The biosensor can be used to measure the concentration of a toxic chemical in the form of a single drop or dissolved in a continuous flow. The detection of 0.1 microg small middle dotL(-1) of a single herbicide as is required by European Community legislation for drinking water is possible with this algal biosensor especially for atrazine, simazine, and diuron.
Collapse
Affiliation(s)
- M Naessens
- Ecole Nationale Sup¿erieure des Mines, Centre SPIN/G¿enie Enzymatique, 158 Cours Fauriel, Saint Etienne cedex 2, 42023, France
| | | | | |
Collapse
|
21
|
Alamdari A, Pierucci F, Leclerc JC, Chassagne S, Stricker C, Fyad JP, Chassagne JF. [The value of sialo-MRI in the study of salivary gland duct pathology]. Rev Stomatol Chir Maxillofac 1999; 100:184-6. [PMID: 10599126] [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] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Usual imaging diagnostic for salivary glands is sialography. Sialography is not stripped of disadvantages and failures. The MRI-sialography is an examination which is carried out without any injection of contrast's product (without catheterization or intravenous injection). It is thus noninvasive and painless. The complete study of salivary gland and its ducts is always possible and could not be blocked by local or loco-regional conditions. It allows exploration of several salivary glands in the same time. We think that the MRI-sialography must find its place in the diagnosis arsenal for salivary pathology in spite of its current handicaps represented by its cost and the difficulty of access to the apparatuses.
Collapse
Affiliation(s)
- A Alamdari
- Service de Chirurgie Plastique et Maxillo-faciale, CHU, Hôpital Central, Nancy
| | | | | | | | | | | | | |
Collapse
|
22
|
Vessière F, Georlette M, Warnier G, Leclerc JC, Van Pel A, Boon T. Immunogenic variants obtained by mutagenesis of mouse Lewis lung carcinoma. Recognition of variant-specific antigens by cytolytic T lymphocytes. Eur J Cancer Clin Oncol 1982; 18:867-74. [PMID: 6185345 DOI: 10.1016/0277-5379(82)90197-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
By mutagenesis of a cell line derived from Lewis lung carcinoma (3LL), it is possible to obtain at high frequency stable tumor cell variants (tum-) that are rejected by syngeneic mice. The possibility of obtaining a cytolytic T cell (CTL) response directed specifically against these tum- variants was examined. With the four variants that were analysed, a significant cytolytic activity was obtained with peritoneal cells from immune mice collected shortly after an intraperitoneal boost and also with spleen cells after a secondary stimulation in vitro. The CTL populations preferentially lysed the immunizing tum- variant, while also showing a cross-reactive lysis against the other variants and the original 3LL cells. Highly active CTL clones could be isolated from limiting dilution microcultures of these CTL populations. The clonal analysis clearly showed the existence of two distinct CTL populations, one directed exclusively against the immunizing variant and another that lysed all 3LL targets equally. This CTL specificity analysis therefore demonstrates directly the presence of new antigens on the 3LL tum- cell variants.
Collapse
|
23
|
Levy D, Hoang-Xuan M, Colombani MJ, Zilber MT, Leclerc JC, Levy JP. Typing of murine cell-surface antigens by cellular radioimmunoassay. J Immunol Methods 1981; 41:333-41. [PMID: 6939754 DOI: 10.1016/0022-1759(81)90195-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A cellular radioimmunoassay utilizing 125I-labelled Protein A was used for detecting antigen-antibody complexes on glutaraldehyde fixed cells attached to microtiter plates. This method is rapid, sensitive and specific for revealing H-2 private and public specificities as well as Ia and Lyt antigens. As plates may be kept for months, several reactivities can be tested in one step on a large panel rendering a regular supply of animals unnecessary.
Collapse
|
24
|
Leclerc JC, Plater C, Connan F, Debré P. T cell-mediated immunity to oncornavirus-induced tumors. IV. Preliminary evidence for a specific suppression of anti-Moloney cell-mediated immune response by autoimmune T cells. Eur J Immunol 1981; 11:45-7. [PMID: 6452279 DOI: 10.1002/eji.1830110110] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Previous reports have demonstrated that adult C57BL/6 mice infected with murine sarcoma virus (MSV) develop a strong cell-mediated immune response against Friend, Moloney, Rauscher virus-induced type-specific (FMR) antigens and reject their tumors. To demonstrate a possible role for auto-anti-MSV T blasts, syngeneic C57BL/6 mice were immunized with highly enriched anti-FMR cytolytic T cells. One of 3 pools of these autoimmune T cells prepared from 12 surviving immunized mice (a) inhibited specifically the in vitro anti-MSV cytolysis generation and (b) enhanced drastically the MSV tumor growth in vivo. The possibility for such an immunization procedure to induce anti-idiotype T cells, the repeatability of this effect and the relationship of the suppressor cells with antigen-specific suppressor cells and other components of the anti-MSV immune response are discussed.
Collapse
|
25
|
Plater C, Debré P, Leclerc JC. T cell-mediated immunity to oncornavirus-induced tumors. III. Specific and nonspecific suppression in tumor-bearing mice. Eur J Immunol 1981; 11:39-44. [PMID: 6452278 DOI: 10.1002/eji.1830110109] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A strong cell-mediated immune response against Friend, Moloney, Rauscher virus-induced (FMR) cell surface antigens has been demonstrated previously in mice which reject oncornavirus-induced tumors. In order to identify an eventual suppressor mechanism in animals with progressively growing tumors, experiments were initiated in C57BL/6 mice bearing either a murine sarcoma virus (MSV) tumor or Moloney virus-induced lymphoma (MBL2). Progressive tumor growth was induced (a) in viremic animals first infected with Moloney murine leukemia virus (M.Mu LV), then inoculated as adult with MSV; (b) in nonviremic animals injected with MBL2 lymphoma cells. In the absence of tumor cells, viremia induces specific tolerance for which there is no evidence for suppressor cells. In tumor-bearing mice, specific suppressor T cells are detected which are able to inhibit the generation of anti-FMR cytolytic T lymphocytes in vitro and enhance the tumor growth in vivo. In addition to the specific suppressor T cells, a nonspecific suppressive activity mediated by metastatic T lymphoma cells is demonstrated in the spleens of lymphoma-bearing animals. The respective role of the virus and tumor cells in the induction of tolerance to M.MuLV-induced antigens, and their relationship to other components of the specific cell-mediated immune response is discussed.
Collapse
|
26
|
Leclerc JC, Cantor H. T cell-mediated immunity to oncornavirus-induced tumors. I. Ly phenotype of precursor and effector cytolytic T lymphocytes. J Immunol 1980; 124:846-50. [PMID: 6243332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Regression of tumor induced by murine sarcoma virus (MSV) is accompanied by the formation of specific cytolytic T lymphocytes (CTL). Selection of T-cells sets by Ly phenotype determination allows separation of T sets involved in the cytolytic reaction. After MSV inoculation we demonstrate that a) Ly123+ cells contain precursors of CTL, b) direct cytolysis is mainly mediated by Ly23 cells, 3) cytolytic memory is divisible into "early" memory, carried by Ly23 cells, and "late" memory, which reverts to an Ly123 precursor population, and d) Ly1 cells are required to induce anti-MSV antibody formation.
Collapse
|
27
|
Leclerc JC, Cantor H. T cell-mediated immunity to oncornavirus-induced tumors. I. Ly phenotype of precursor and effector cytolytic T lymphocytes. The Journal of Immunology 1980. [DOI: 10.4049/jimmunol.124.2.846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
Regression of tumor induced by murine sarcoma virus (MSV) is accompanied by the formation of specific cytolytic T lymphocytes (CTL). Selection of T-cells sets by Ly phenotype determination allows separation of T sets involved in the cytolytic reaction. After MSV inoculation we demonstrate that a) Ly123+ cells contain precursors of CTL, b) direct cytolysis is mainly mediated by Ly23 cells, 3) cytolytic memory is divisible into "early" memory, carried by Ly23 cells, and "late" memory, which reverts to an Ly123 precursor population, and d) Ly1 cells are required to induce anti-MSV antibody formation.
Collapse
|
28
|
Leclerc JC, Cantor H. T cell-mediated immunity to oncornavirus-induced tumors. II. Ability of different T cell sets to prevent tumor growth in vivo. The Journal of Immunology 1980. [DOI: 10.4049/jimmunol.124.2.851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
These studies demonstrate that two different types of protective immunologic reactions are generated in mice after inoculation with M.MSV. Type I protection, mediated by Ly1 cells, prevents MSV-induced sarcomas but has no effect on the growth of MLV+ lymphomas. This anti-MSV protection reflects induction of antivirion antibody and delayed type hypersensitivity reaction. Type II protection is mediated by Ly23 cells and prevents the growth of an MLV+ lymphoma, but has little or no protective effects against MSV-induced sarcomas. This "type II" reaction is directly related to CTL activity. The implications of these two protective reaction are discussed.
Collapse
|
29
|
Leclerc JC, Cantor H. T cell-mediated immunity to oncornavirus-induced tumors. II. Ability of different T cell sets to prevent tumor growth in vivo. J Immunol 1980; 124:851-4. [PMID: 6243333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
These studies demonstrate that two different types of protective immunologic reactions are generated in mice after inoculation with M.MSV. Type I protection, mediated by Ly1 cells, prevents MSV-induced sarcomas but has no effect on the growth of MLV+ lymphomas. This anti-MSV protection reflects induction of antivirion antibody and delayed type hypersensitivity reaction. Type II protection is mediated by Ly23 cells and prevents the growth of an MLV+ lymphoma, but has little or no protective effects against MSV-induced sarcomas. This "type II" reaction is directly related to CTL activity. The implications of these two protective reaction are discussed.
Collapse
|
30
|
Leclerc JC, Hoarau J, Remy R. Analysis of absorption spectra changes induced by temperature lowering on phycobilisomes, thylakoids and chlorophyll-protein complexes. Biochim Biophys Acta 1979; 547:398-409. [PMID: 111711 DOI: 10.1016/0005-2728(79)90020-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Using fourth derivative analysis, differences between room and low temperature absorption spectra were studied. The positions of most absorption bands of the water-soluble, accessory pigment complex, the phycobilisome, remained unchanged after cooling. The stability of the wavelength positions of chlorophyll a forms in vivo as a function of temperature (Gulyaev, B.A. and Litvin, F.F. (1967) Biofizika 12, 845--854) was generally confirmed. The wavelength positions of all chlorophyll a forms in the P-700 chlorophyll a protein complex were unchanged when the preparations were cooled to -196 degrees C. Likewise, with other chlorophyll-containing materials: the light-harvesting chlorophyll a/b protein complex and the thylakoids of higher plants, algae, and cyanobacteria, the wavelengths positions of most chlorophyll a forms were stable upon cooling. An exception was a 680 nm chlorophyll a band which was generally split at low temperature into two bands with the materials investigated. An interpretation of the multiplicity of chlorophyll spectral forms and the spectral changes induced by cooling for these forms is given using exciton theory and the energy-coupling variation of chlorophyll a molecules.
Collapse
|
31
|
Kasai M, Leclerc JC, McVay-Boudreau L, Shen FW, Cantor H. Direct evidence that natural killer cells in nonimmune spleen cell populations prevent tumor growth in vivo. J Exp Med 1979; 149:1260-4. [PMID: 448287 PMCID: PMC2184872 DOI: 10.1084/jem.149.5.1260] [Citation(s) in RCA: 113] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Relatively large numbers of nonimmune spleen cells do not protect against the local growth of two lymphomas. However, this heterogeneous population of splenic lymphocytes contains a subset of cells that efficiently protects against in vivo tumor growth. This cell population (cell-surface phenotype Thyl.2(-)Ig(-)Ly5.1(+)) represents less than 5 percent of the spleen cell population and is responsible for in vitro NK-mediated lysis. Although these studies clearly and directly demonstrate that Ly5(+) NK cells selected from a heterogeneous lymphoid population from nonimmune mice can protect syngeneic mice against local in vivo growth of two different types of tumor cells (in contrast to other lymphocyte sets within the spleen), they do not directly bear upon the role of NK cells in immunosurveillance. They do indicate that highly enriched Ig(-)Thyl(-)Ly5(+) cells, which account for virtually all in vitro NK activity, can retard tumor growth in vivo. It is difficult to ascribe all anti-tumor surveillance activity to NK cells, because they probably do not recirculate freely throughout the various organ systems of the body. Perhaps NK ceils may play a role in prevention of neoplastic growth within discrete anatomic compartments where there is rapid differentiation of stem cells to mature progeny (e.g., bone marrow, spleen, and portions of the gastrointestinal tract)and may normally act to regulate the growth and differentiation of non-neoplastic stem cells. Long-term observation of chimeric mice repopulated with bone marrow from congenic or mutant donors expressing very low or very high NK activity may help to answer these questions.
Collapse
|
32
|
|
33
|
Hoarau J, Remy R, Leclerc JC. [Heterogeneity of photoinduced spectral changes near 700 nm observed with chlorophyllous membranes and chlorophyll-protein complexes isolated from different photosynthesizing organisms]. Biochim Biophys Acta 1977; 462:659-70. [PMID: 202307 DOI: 10.1016/0005-2728(77)90108-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
34
|
Remy R, Hoarau J, Leclerc JC. Electrophoretic and spectrophotometric studies of chlorophyll-protein complexes from tobacco chloroplasts. Isolation of a light harvesting pigment protein complex with a molecular weight of 70,000. Photochem Photobiol 1977; 26:151-8. [PMID: 905362 DOI: 10.1111/j.1751-1097.1977.tb07466.x] [Citation(s) in RCA: 79] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Abstract— …After a short‐term solubilization with sodium dodecyl sulphate, chloroplast membranes of tobacco were separated by polyacrylamide gel electrophoresis into three chlorophyll‐protein complexes. In addition to the two major complexes termed I and IIc corresponding respectively to P700 chlorophyll a‐protein and light‐harvesting chlorophyll a/b‐protein described by Thornber (1975), a relatively stable complex termed IIa has been observed. This new complex has an apparent molecular weight of 70,000 daltons and possesses Chl a and b.Complexes I, IIa and IIC have been isolated and precise spectroscopic analyses have been performed. Fourth derivative analyses of low temperature absorption spectra suggest that complex IIa seems more representative than IIC of chlorophyll a forms present in intact thylakoid membranes.Moreover, the electrophoretic study reveals that CPI and CPII are composed of only one polypeptidic subunit with respective molecular weights of 68,000 and 24,000 daltons.
Collapse
|
35
|
Fridman WH, Fradelizi D, Guimezanes A, Plater C, Leclerc JC. The role of the Fc receptor (FcR) of thymus-derived lymphocytes. II. Presence of FcR on suppressor cells and direct involvement in suppression. Eur J Immunol 1977; 7:549-54. [PMID: 302794 DOI: 10.1002/eji.1830070811] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
36
|
Leclerc JC, Plater C, Fridman WH. The role of the Fc receptor (FcR) of thymus-derived lymphocytes. I. Presence of FcR on cytotoxic lymphocytes and absence of direct role in cytotoxicity. Eur J Immunol 1977; 7:543-8. [PMID: 302793 DOI: 10.1002/eji.1830070810] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
37
|
MESH Headings
- Animals
- Antibodies, Neoplasm
- Antibodies, Viral
- Antibody Formation
- Antigens, Neoplasm
- Antigens, Viral
- Capsid/immunology
- Cell Membrane/immunology
- Cell Transformation, Neoplastic
- Defective Viruses/immunology
- Epitopes
- Gammaretrovirus/immunology
- Helper Viruses/immunology
- Histocompatibility Antigens
- Immunity
- Immunity, Cellular
- Immunosuppression Therapy
- Leukemia, Experimental/etiology
- Leukemia, Experimental/immunology
- Lymphocytes/immunology
- Mice
- Neoplasm Transplantation
- Sarcoma Viruses, Murine/immunology
- Sarcoma, Experimental/etiology
- Sarcoma, Experimental/immunology
- Tumor Virus Infections/immunology
Collapse
|
38
|
Leclerc JC, Gomard E, Levy JP, Senik A. Antigenic specificity of cell-mediated antitumor reaction in the MSV system. Bibl Haematol 1975:173-6. [PMID: 60997 DOI: 10.1159/000399121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
39
|
Levy JP, Leclerc JC. Immune rejection of tumor cells: in vivo significance of anti-tumor in vitro immune reactions. Biomedicine 1975; 22:249-54. [PMID: 776239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The mechanism of immune tumor rejection remains poorly understood. The respective roles of antibodies, macrophages, cytolytic T cells (CTL) and that of "K" cells or any other cell which could be involved in antibody dependant cell mediated cytotoxicity are still unknown. It is probable that the CTL play some role in tumor rejection but the "in vivo" relevance of the other, "in vitro" detected phenomena, is less clear. The correlations between "in vivo" tumor rejection and "in vitro" detected reactions are very difficult to establish, specially for the following two reasons: a) the different methods used in vitro do not explore identical phenomena ; b) some of them provide both specific and non-specific reactions.
Collapse
|
40
|
|
41
|
|
42
|
Plata F, Gomard E, Leclerc JC, Levy JP. Comparative in vitro studies on effector cell diversity in the cellular immune response to murine sarcoma virus (MSV)-induced tumors in mice. J Immunol 1974; 112:1477-87. [PMID: 4360862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
43
|
Leclerc JC, Senik A, Gomard E, Plata F, Levy JP. Cell-mediated antitumor immune reactions under syngeneic conditions. Transplant Proc 1973; 5:1431-4. [PMID: 4359721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
44
|
Plata F, Gomard E, Leclerc JC, Levy JP. Further evidence for the involvement of thymus-processed lymphocytes in syngeneic tumor cell cytolysis. J Immunol 1973; 111:667-71. [PMID: 4542607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
45
|
Gomard E, Leclerc JC, Levy JP. Murine leukemia and sarcoma viruses: further studies on the antigens of the viral envelope. J Natl Cancer Inst 1973; 50:955-61. [PMID: 4122212 DOI: 10.1093/jnci/50.4.955] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
|
46
|
Leclerc JC, Gomard E, Plata F, Levy JP. Cell-mediated immune reaction against tumors induced by oncornaviruses. II. Nature of the effector cells in tumor-cell cytolysis. Int J Cancer 1973; 11:426-32. [PMID: 4545387 DOI: 10.1002/ijc.2910110220] [Citation(s) in RCA: 81] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
47
|
Leclerc JC, Gomard E, Levy JP. Cell-mediated reaction against tumors induced by oncornaviruses. I. Kinetics and specificity of the immune response in murine sarcoma virus (MSV)-induced tumors and transplanted lymphomas. Int J Cancer 1972; 10:589-601. [PMID: 4128690 DOI: 10.1002/ijc.2910100318] [Citation(s) in RCA: 77] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
48
|
Leclerc JC, Gomard E, Pavie J, Lévy JP. [Evolution of the cytotoxic activity of immune lymphocytes in response to a graft of leukemic cells in mice]. C R Acad Hebd Seances Acad Sci D 1972; 274:1233-6. [PMID: 4624951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
49
|
Varet B, Levy JP, Leclerc JC, Kourilsky FM. Effect of antithymocytic serum on viral leukemia, erythroblastosis, and sarcoma in mice. Int J Cancer 1971; 7:313-21. [PMID: 5281515 DOI: 10.1002/ijc.2910070216] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
50
|
Leclerc JC, Levy JP, Varet B, Oppenheim S, Senik A. Antigenic analysis of L strain cells: a new murine leukemia-associated antigen, "L". Cancer Res 1970; 30:2073-9. [PMID: 4318470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|