1
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Toro-Cardona FA, Parra JL, Rojas-Soto OR. Predicting daily activity time through ecological niche modelling and microclimatic data. J Anim Ecol 2023; 92:925-935. [PMID: 36744653 DOI: 10.1111/1365-2656.13895] [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: 02/23/2022] [Accepted: 01/24/2023] [Indexed: 02/07/2023]
Abstract
Climate temporality is a phenomenon that affects species activity and distribution patterns across spatial and temporal scales. Despite the global availability of microclimatic data, their use to predict activity patterns and distributions remains scarce, particularly at fine temporal scales (e.g. < month). Predicting activity patterns based on climatic data may allow us to foresee some of the consequences of climate change, particularly for ectothermic vertebrates. The Gila monster exhibits marked daily and seasonal activity patterns linked to physiology and reproduction. Here we evaluate whether ecological niche models fitted using microclimate data can predict temporal activity patterns using the Gila monster Heloderma suspectum as a study system. Furthermore, we identified whether the activity patterns are related to physiological constraints. We used dated occurrences from museum specimens and human observations to generate and test ecological niche models using minimum volume ellipsoids. We generated hourly microclimatic data for each occurrence site for 10 years using the NicheMapR package. For ecological niche modelling, we compared the traditional seasonal approach versus a daily activity pattern strategy for model construction. We tested both using the omission rate of independent observations (citizen science data). Finally, we tested whether unimodal and bimodal activity patterns for each season could be recreated through ecological niche modelling and whether these patterns followed known physiological constraints. The unimodal and bimodal activity patterns previously reported directly from tracking individuals across the year were recovered using niche modelling and microclimate across the species' geographical range. We found that upper thermal tolerances can explain the daily activity patterns of this species. We conclude that ecological niche models trained with microclimatic data can be used to predict activity patterns at high temporal resolutions, particularly on ectotherm species of arid zones coping with rapid climate modifications. Furthermore, the use of high temporal resolution variables can lead to a better niche delimitation, enhancing the results of any research objective that uses correlative models.
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Affiliation(s)
- Felipe A Toro-Cardona
- Laboratorio de Bioclimatología, Red de Biología Evolutiva, Instituto de Ecología, A. C. Xalapa, Veracruz, Mexico.,Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Medellín, Colombia
| | - Juan L Parra
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Medellín, Colombia
| | - Octavio R Rojas-Soto
- Laboratorio de Bioclimatología, Red de Biología Evolutiva, Instituto de Ecología, A. C. Xalapa, Veracruz, Mexico
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2
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Beltrán DF, Araya-Salas M, Parra JL, Stiles FG, Rico-Guevara A. The evolution of sexually dimorphic traits in ecological gradients: an interplay between natural and sexual selection in hummingbirds. Proc Biol Sci 2022; 289:20221783. [PMID: 36515116 PMCID: PMC9748779 DOI: 10.1098/rspb.2022.1783] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 11/22/2022] [Indexed: 12/15/2022] Open
Abstract
Traits that exhibit differences between the sexes have been of special interest in the study of phenotypic evolution. Classic hypotheses explain sexually dimorphic traits via intra-sexual competition and mate selection, yet natural selection may also act differentially on the sexes to produce dimorphism. Natural selection can act either through physiological and ecological constraints on one of the sexes, or by modulating the strength of sexual/social selection. This predicts an association between the degree of dimorphism and variation in ecological environments. Here, we characterize the variation in hummingbird dimorphism across ecological gradients using rich databases of morphology, colouration and song. We show that morphological dimorphism decreases with elevation in the understorey and increases with elevation in mixed habitats, that dichromatism increases at high altitudes in open and mixed habitats, and that song is less complex in mixed habitats. Our results are consistent with flight constraints, lower predation pressure at high elevations and with habitat effects on song transmission. We also show that dichromatism and song complexity are positively associated, while tail dimorphism and song complexity are negatively associated. Our results suggest that key ecological factors shape sexually dimorphic traits, and that different communication modalities do not always evolve in tandem.
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Affiliation(s)
- Diego F. Beltrán
- Department of Biology, University of Washington, Seattle, WA 98195, USA
| | - Marcelo Araya-Salas
- Centro de Investigación en Neurociencias, Universidad de Costa Rica, San José, Costa Rica
- Escuela de Biología, Universidad de Costa Rica, San José, Costa Rica
| | - Juan L. Parra
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Universidad de Antioquia, Medellín, Colombia
| | - F. Gary Stiles
- Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá D.C., Colombia
| | - Alejandro Rico-Guevara
- Department of Biology, University of Washington, Seattle, WA 98195, USA
- Burke Museum of Natural History and Culture, University of Washington, Seattle, WA 98105, USA
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3
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Tenelanda-Osorio LI, Parra JL, Cuartas-Restrepo P, Zuluaga JI. Enceladus as a Potential Niche for Methanogens and Estimation of Its Biomass. Life (Basel) 2021; 11:1182. [PMID: 34833058 PMCID: PMC8624164 DOI: 10.3390/life11111182] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 09/24/2021] [Accepted: 10/14/2021] [Indexed: 11/17/2022] Open
Abstract
Enceladus is a potential target for future astrobiological missions. NASA's Cassini spacecraft demonstrated that the Saturnian moon harbors a salty ocean beneath its icy crust and the existence and analysis of the plume suggest water-rock reactions, consistent with the possible presence of hydrothermal vents. Particularly, the plume analysis revealed the presence of molecular hydrogen, which may be used as an energy source by microorganisms ( e.g., methanogens). This could support the possibility that populations of methanogens could establish in such environments if they exist on Enceladus. We took a macroscale approximation using ecological niche modeling to evaluate whether conditions suitable for methanogenic archaea on Earth are expected in Enceladus. In addition, we employed a new approach for computing the biomass using the Monod growth model. The response curves for the environmental variables performed well statistically, indicating that simple correlative models may be used to approximate large-scale distributions of these genera on Earth. We found that the potential hydrothermal conditions on Enceladus fit within the macroscale conditions identified as suitable for methanogens on Earth, and estimated a concentration of 1010-1011 cells/cm3.
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Affiliation(s)
- Laura I. Tenelanda-Osorio
- Grupo de Estudios en Astrobiología AMEBA, Planetario de Medellín, Medellín 050010, Colombia;
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología-FCEN, Universidad de Antioquia, Medellín 050010, Colombia;
- Solar, Earth and Planetary Physics—SEAP, Instituto de Física-FCEN, Universidad de Antioquia, Medellín 050010, Colombia;
| | - Juan L. Parra
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología-FCEN, Universidad de Antioquia, Medellín 050010, Colombia;
| | - Pablo Cuartas-Restrepo
- Solar, Earth and Planetary Physics—SEAP, Instituto de Física-FCEN, Universidad de Antioquia, Medellín 050010, Colombia;
| | - Jorge I. Zuluaga
- Grupo de Estudios en Astrobiología AMEBA, Planetario de Medellín, Medellín 050010, Colombia;
- Solar, Earth and Planetary Physics—SEAP, Instituto de Física-FCEN, Universidad de Antioquia, Medellín 050010, Colombia;
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4
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Morales CC, Gómez JP, Parra JL. Patterns of morphological differentiation within Manacus manacus (Aves: Pipridae) in Colombia: revisiting hypotheses of isolation and secondary contact. Biol J Linn Soc Lond 2021. [DOI: 10.1093/biolinnean/blab106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Determining the factors responsible for phenotypic variation within species is a fundamental task in evolutionary ecology. Isolation by distance, isolation by environment and clines along secondary contact zones between formerly isolated populations are common patterns of morphological variation. In this study, we evaluated whether patterns of morphological variation exhibit association with isolation by distance, isolation by environment or secondary contact in populations of Manacus manacus with contrasting plumage colour. We used field and museum measurements of five morphological characters from 311 individuals from 88 localities distributed across a highly heterogeneous environmental range within Colombia. Climatic variables explained a higher proportion of the variation than geographic distance among localities. We found differences in wing and culmen length between white and yellow phenotypes of M. manacus in Colombia. Overall morphology did not change in a clinal fashion in relation to the contact zone and the few traits that exhibit clinal variation suggest a distant locality for the contact zone, not in line with our expectations by secondary contact between differentiated populations, suggesting alternative mechanisms for differentiation between subspecies. Our results suggest that this species exhibits marked morphological variation associated with changes in temperature and precipitation. These associations are consistent throughout the geographic range analysed, leading us to postulate that dispersal and local adaptation jointly shape the distribution of phenotypic variation.
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Affiliation(s)
- Christian C Morales
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Universidad de Antioquia, Medellín 050010, Colombia
| | - Juan P Gómez
- Departamento de Química y Biología, Universidad del Norte, Barranquilla 08001, Colombia
| | - Juan L Parra
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Universidad de Antioquia, Medellín 050010, Colombia
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5
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Beltrán DF, Shultz AJ, Parra JL. Speciation rates are positively correlated with the rate of plumage color evolution in hummingbirds. Evolution 2021; 75:1665-1680. [PMID: 34037257 DOI: 10.1111/evo.14277] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 04/28/2021] [Accepted: 04/29/2021] [Indexed: 12/13/2022]
Abstract
A fascinating pattern in nature is the uneven distribution of biodiversity among clades, some with low species richness and phenotypic variation in contrast to others with remarkable species richness and phenotypic diversity. In animals, communication signals are crucial for intra- and interspecific interactions and are likely an important factor in speciation. However, evidence for the association between the evolution of such signals and speciation is mixed. In hummingbirds, plumage coloration is an important communication signal, particularly for mate selection. Here, using reflectance data for 237 hummingbird species (∼66% of total diversity), we demonstrate that color evolution rates are associated with speciation rates, and that differences among feather patches are consistent with an interplay between natural and sexual selection. We found that female color evolution rates of multiple plumage elements, including the gorget, were similar to those of males. Although male color evolution in this patch was associated with speciation, female gorget color evolution was not. In other patches, the relationship between speciation and color evolution rates was pervasive between sexes. We anticipate that future studies on animal communication will likely find that evolution of signaling traits of both sexes has played a vital role in generating signal and species diversity.
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Affiliation(s)
- Diego F Beltrán
- Instituto de Biología, Universidad de Antioquia, Medellín, 050010, Colombia.,Department of Biology, University of Washington, Seattle, Washington, 98195, USA
| | - Allison J Shultz
- Ornithology Department, Natural History Museum of Los Angeles County, Los Angeles, California, 90007, USA
| | - Juan L Parra
- Instituto de Biología, Universidad de Antioquia, Medellín, 050010, Colombia
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6
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Valencia-Rodríguez D, Jiménez-Segura L, Rogéliz CA, Parra JL. Ecological niche modeling as an effective tool to predict the distribution of freshwater organisms: The case of the Sabaleta Brycon henni (Eigenmann, 1913). PLoS One 2021; 16:e0247876. [PMID: 33657168 PMCID: PMC7928524 DOI: 10.1371/journal.pone.0247876] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 02/16/2021] [Indexed: 11/18/2022] Open
Abstract
Ecological niche models (ENMs) aim to recreate the relationships between species and the environments where they occur and allow us to identify unexplored areas in geography where these species might be present. These models have been successfully used in terrestrial organisms but their application in aquatic organisms is still scarce. Recent advances in the availability of species occurrences and environmental information particular to aquatic systems allow the evaluation of these models. This study aims to characterize the niche of the Sabaleta Brycon henni Eigenmann 1913, an endemic fish of the Colombian Andes, using ENMs to predict its geographical distribution across the Magdalena Basin. For this purpose, we used a set of environmental variables specific to freshwater systems in addition to the customary bioclimatic variables, and species' occurrence data to model its potential distribution using the Maximum Entropy algorithm (MaxEnt). We evaluate the relative importance between these two sets of variables, the model's performance, and its geographic overlap with the IUCN map. Both on-site (annual precipitation, minimum temperature of coldest month) and upstream variables (open waters, average minimum temperature of the coldest month and average precipitation seasonality) were included in the models with the highest predictive accuracy. With an area under the curve of 90%, 99% of the species occurrences and 68% of absences correctly predicted, our results support the good performance of ENMs to predict the potential distribution of the Sabaleta and the utility of this tool in conservation and decision-making at the national level.
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Affiliation(s)
- Daniel Valencia-Rodríguez
- Departamento de Biología, Grupo de ictiología de la Universidad de Antioquia, Universidad de Antioquia, Medellín, Antioquia, Colombia
| | - Luz Jiménez-Segura
- Departamento de Biología, Grupo de ictiología de la Universidad de Antioquia, Universidad de Antioquia, Medellín, Antioquia, Colombia
| | | | - Juan L. Parra
- Departamento de Biología, Grupo de ecología y evolución de vertebrados, Universidad de Antioquia, Medellín, Antioquia, Colombia
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7
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Eliason CM, Maia R, Parra JL, Shawkey MD. Signal evolution and morphological complexity in hummingbirds (Aves:
Trochilidae
). Evolution 2020; 74:447-458. [DOI: 10.1111/evo.13893] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 11/11/2019] [Accepted: 11/12/2019] [Indexed: 02/04/2023]
Affiliation(s)
- Chad M. Eliason
- Grainger Bioinformatics Center Field Museum of Natural History Chicago
| | - Rafael Maia
- Grainger Bioinformatics Center Field Museum of Natural History Chicago
| | - Juan L. Parra
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología Universidad de Antioquia Medellín Colombia
| | - Matthew D. Shawkey
- Evolution and Optics of Nanostructures Group, Department of Biology University of Ghent 9000 Ghent Belgium
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8
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Espindola S, Parra JL, Vázquez-Domínguez E. Fundamental niche unfilling and potential invasion risk of the slider turtle Trachemys scripta. PeerJ 2019; 7:e7923. [PMID: 31637143 PMCID: PMC6800977 DOI: 10.7717/peerj.7923] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 05/23/2019] [Accepted: 09/19/2019] [Indexed: 11/20/2022] Open
Abstract
Background How species colonize new environments is still a fundamental question in ecology and evolution, assessable by evaluating range characteristics of invasive species. Here we propose a model approach to evaluate environmental conditions and species features to predict niche changes in non-equilibrium contexts. It incorporates potentially range-limiting processes (fundamental niche), hence allowing for better predictions of range shifts, differentiation of analog and non-analog conditions between the native and non-native (invaded) ranges, and identification of environmental conditions not currently available but likely in the future. We apply our approach with the worldwide invasive slider-turtle Trachemys scripta. Methods We estimated the native and non-native realized niches of T. scripta and built its fundamental niche based on key features of the turtle’s temperature physiological tolerance limits and survival-associated factors. We next estimated response functions adjusted to the physiological predictor variables and estimated habitat suitability values, followed by a comprehensive set of analyses and simulations to compare the environmental conditions occupied by T. scripta (at its native and non-native ranges). Results Climatic space analysis showed that the T. scripta’s non-native realized niche is 28.6% greater than the native one. Response curves showed that it does not use its entire range of temperature tolerances (density curves for native: 5.3–23.7 °C and non-native: 1.7–28.4 °C ranges). Whether considering the mean temperature of the warmest or the coldest quarter, it occupies a wider range of temperatures along its non-native distribution. Results of the response curves for worldwide (global) and across Mexico (regional) comparisons showed it occupies analog and non-analog conditions between its native and invaded ranges, exhibiting also unoccupied suitable climatic conditions. Discussion We demonstrate that T. scripta occupies a wider subset of its fundamental niche along its non-native range (within its physiological tolerances), revealing that the species observed niche shift corresponds to a different subset of its fundamental niche (niche unfilling). We also identified suitable environmental conditions, globally and regionally, where the slider turtle could potentially invade. Our approach allows to accurately predict niche changes in novel or non-equilibrium contexts, which can improve our understanding about ecological aspects and geographic range boundaries in current and potential invasions.
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Affiliation(s)
- Sayra Espindola
- Departamento de Ecología de la Biodiversidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México, México.,Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de México, México
| | - Juan L Parra
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Universidad de Antioquia, Medellín, Colombia
| | - Ella Vázquez-Domínguez
- Departamento de Ecología de la Biodiversidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México, México.,American Museum of Natural History, New York, NY, United States of America
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9
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Chaparro-Herrera S, Lopera-Salazar A, Gutiérrez-Zuluaga AM, Betancur J, Martínez Alvarado D, Rivera Gutiérrez HF, Parra JL. Avifauna en dos complejos de páramo de Antioquia, Colombia. Biota Colombiana 2019. [DOI: 10.21068/c2019.v20n01a06] [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: 11/17/2022] Open
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10
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Huber-Ruano I, Raventós C, Cuartas I, Sánchez-Jaro C, Arias A, Parra JL, Wosikowski K, Janicot M, Seoane J. An antisense oligonucleotide targeting TGF-β2 inhibits lung metastasis and induces CD86 expression in tumor-associated macrophages. Ann Oncol 2018; 28:2278-2285. [PMID: 28911087 DOI: 10.1093/annonc/mdx314] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Background The transforming growth factor (TGF)-β pathway is a well-described inducer of immunosuppression and can act as an oncogenic factor in advanced tumors. Several preclinical and clinical studies show that the TGF-β pathway can be considered a promising molecular target for cancer therapy. The human genome has three TGF-β isoforms and not much is known about the oncogenic response to each of the isoforms. Here, we studied the antitumor response to ISTH0047, a recently developed locked nucleic acid-modified antisense oligonucleotide targeting TGF-β2. Materials and methods We have studied the anticancer response to ISTH0047 using gymnotic delivery in tumor cell cultures and in in vivo preclinical orthotopic mouse models for primary tumors (breast and kidney tumors) and lung metastasis. Results We observed that ISTH0047 is able to significantly reduce TGF-β2 mRNA and protein levels without altering the levels of TGF-β1 and TGF-β3. ISTH0047 prevented lung metastasis in syngeneic orthotopic renal cell carcinoma (RENCA) and breast cancer (4T1) tumor models. In addition, using an orthotopic xenograft model of a lung cancer cell line (CRL5807) that mainly expresses TGF-β2, we observed that ISTH0047 had an important effect on the lung microenvironment inhibiting the growth of lung lesions. ISTH0047 treatment re-educated macrophages in the lung parenchyma to express the tumor-suppressive factor, CD86. Conclusion Overall, our data point to TGF-β2 as a therapeutic target and ISTH0047 as a novel anticancer drug to prevent lung metastasis by impacting on the tumor niche, in part, through the induction of CD86 in tumor-associated macrophages.
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Affiliation(s)
- I Huber-Ruano
- Translational Research Program, Vall d Hebron Institute of Oncology (VHIO), Barcelona
| | - C Raventós
- Translational Research Program, Vall d Hebron Institute of Oncology (VHIO), Barcelona
| | - I Cuartas
- Translational Research Program, Vall d Hebron Institute of Oncology (VHIO), Barcelona
| | - C Sánchez-Jaro
- Translational Research Program, Vall d Hebron Institute of Oncology (VHIO), Barcelona
| | - A Arias
- Translational Research Program, Vall d Hebron Institute of Oncology (VHIO), Barcelona
| | - J L Parra
- Translational Research Program, Vall d Hebron Institute of Oncology (VHIO), Barcelona
| | | | - M Janicot
- Isarna Therapeutics, Munich, Germany
| | - J Seoane
- Translational Research Program, Vall d Hebron Institute of Oncology (VHIO), Barcelona.,Universitat Autònoma de Barcelona, Cerdanyola del Vallès.,Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
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11
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Montoya P, Gonzalez MA, Tenorio EA, López-Ordóñez JP, Pinto Gómez A, Cueva D, Acevedo Rincón AA, Angarita Yanes C, Arango Martínez HM, Armesto O, Betancur JS, Caguazango Castro A, Calderon Leyton JJ, Calpa-Anaguano EV, Cárdenas-Posada G, Castaño Díaz M, Chaparro-Herrera S, Diago-Muñoz N, Franco Espinosa L, Gómez Bernal LG, Gonzalez-Zapata FL, Gutiérrez Zamora EA, Gutiérrez-Zuluaga AM, Lizcano Jiménez RS, Lopera-Salazar A, Alvarado DM, Maya Girón AM, Medina W, Montealegre-Talero C, Parra JL, Pérez-Peña S, Ramírez Ramírez F, Reyes J, Rivera-Gutiérrez HF, Rosero Mora Y, Trujillo-Torres CM, Vidal-Maldonado CC, Salgado-Negret B. A morphological database for 606 Colombian bird species. Ecology 2018; 99:1693. [PMID: 29701245 DOI: 10.1002/ecy.2368] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 03/10/2018] [Accepted: 03/20/2018] [Indexed: 11/11/2022]
Abstract
Colombia is the country with the highest bird diversity in the world. Despite active research in ornithology, compelling morphological information of most bird species is still sparse. However, morphological information is the baseline to understand how species respond to environmental variation and how ecosystems respond to species loss. As part of a national initiative, the Instituto Alexander von Humboldt in collaboration with 12 Colombian institutions and seven biological collections, measured up to 15 morphological traits of 9,892 individuals corresponding to 606 species: 3,492 from individuals captured in field and 6,400 from museum specimens. Species measured are mainly distributed in high Andean forest, páramo, and wetland ecosystems. Seven ornithological collections in Colombia and 18 páramo complexes throughout Colombia were visited from 2013 to 2015. The morphological traits involved measurements from bill (total and exposed culmen, bill width and depth), wing (length, area, wingspan, and the distance between longest primary and longest secondary), tail (length and shape), tarsus (length), hallux (length and claw hallux), and mass. The number of measured specimens per species was variable, ranging from 1 to 321 individuals with a median of four individuals per species. Overall, this database gathered morphological information for >30% of Colombian bird diversity. No copyright, proprietary, or cost restrictions apply; the data should be cited appropriately when used.
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Affiliation(s)
- Paola Montoya
- Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, Avenida Paseo Bolívar 16-20, Bogotá, Colombia.,Instituto de Biología, Universidad de Antioquia, Medellín, Colombia
| | - Mailyn A Gonzalez
- Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, Avenida Paseo Bolívar 16-20, Bogotá, Colombia
| | - Elkin A Tenorio
- Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, Avenida Paseo Bolívar 16-20, Bogotá, Colombia
| | - Juan Pablo López-Ordóñez
- Departamento de Ciencias Biológicas, Universidad de los Andes, Bogotá, Colombia.,Conservación Internacional Colombia, Bogotá, Colombia
| | | | - Diego Cueva
- Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá, Colombia.,Seção de aves, Museu de Zoologia da Universidade de São Paulo, Pós-Graduação, CEP 04218-970, São Paulo, Brazil
| | - Aldemar A Acevedo Rincón
- GIEB-Universidad de Pamplona, Norte de Santander, Pamplona, Colombia.,Doctorado en Ciencias Biológicas-Mención Ecología, Pontificia Universidad Católica de Chile, Santiago, Chile
| | | | - Héctor Manuel Arango Martínez
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Medellín, Colombia
| | - Orlando Armesto
- GIEB-Universidad de Pamplona, Norte de Santander, Pamplona, Colombia.,Doctorado en Ciencias Biológicas-Mención Ecología, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Jefry S Betancur
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Medellín, Colombia
| | | | | | - Edna Viviana Calpa-Anaguano
- Grupo de Investigación en Ecología Evolutiva, Universidad de Nariño, Pasto, Colombia.,Asociación GAICA, Pasto, Colombia
| | | | | | - Sergio Chaparro-Herrera
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Medellín, Colombia.,Bosques y Semillas SAS, Bogotá, Colombia
| | | | | | - Luis Germán Gómez Bernal
- Departamento de Biología, Universidad del Cauca, Popayán, Colombia.,Grupo GECO, Departamento de Biología, Universidad del Cauca, Popayán, Colombia
| | | | | | - Ana M Gutiérrez-Zuluaga
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Medellín, Colombia
| | - Robinson Stivel Lizcano Jiménez
- Departamento de Biología, Universidad del Cauca, Popayán, Colombia.,Grupo GECO, Departamento de Biología, Universidad del Cauca, Popayán, Colombia
| | - Andrea Lopera-Salazar
- Instituto de Biología, Universidad de Antioquia, Medellín, Colombia.,Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Medellín, Colombia
| | - Dariel Martínez Alvarado
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Medellín, Colombia
| | | | - Wilderson Medina
- Grupo Sistemática Biológica, SisBio, Universidad Pedagógica y Tecnológica de Colombia, Tunja, Colombia
| | | | - Juan L Parra
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Medellín, Colombia
| | - Sebastián Pérez-Peña
- Grupo Sistemática Biológica, SisBio, Universidad Pedagógica y Tecnológica de Colombia, Tunja, Colombia
| | - Francis Ramírez Ramírez
- Grupo de Investigación en Ecología Evolutiva, Universidad de Nariño, Pasto, Colombia.,Asociación GAICA, Pasto, Colombia
| | - Julián Reyes
- Wildlife Conservation Society Colombia, Cali, Colombia
| | - Héctor Fabio Rivera-Gutiérrez
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Medellín, Colombia
| | - Yuri Rosero Mora
- Grupo de Investigación en Ecología Evolutiva, Universidad de Nariño, Pasto, Colombia.,Asociación GAICA, Pasto, Colombia
| | - Carlos M Trujillo-Torres
- Grupo de Investigación en Ecología Evolutiva, Universidad de Nariño, Pasto, Colombia.,Asociación GAICA, Pasto, Colombia
| | - Cristian Camilo Vidal-Maldonado
- Wildlife Conservation Society Colombia, Cali, Colombia.,Grupo de Estudios Ambientales, Universidad del Cauca, Popayán, Colombia
| | - Beatriz Salgado-Negret
- Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, Avenida Paseo Bolívar 16-20, Bogotá, Colombia.,Departamento de Química y Biología, Universidad del Norte, Barraquilla, Colombia
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Chaparro-Herrera S, Montoya P, Rivera HF, Parra JL. Nota - Primeros registros del colibrí aliazul (Pterophanes cyanopterus (Fraser, 1839)) (Apodiformes, Trochilidae) en el departamento de Antioquia, Colombia. Biota 2018. [DOI: 10.21068/c2017.v18n02a18] [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: 11/17/2022] Open
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13
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Bell RC, Parra JL, Badjedjea G, Barej MF, Blackburn DC, Burger M, Channing A, Dehling JM, Greenbaum E, Gvoždík V, Kielgast J, Kusamba C, Lötters S, McLaughlin PJ, Nagy ZT, Rödel M, Portik DM, Stuart BL, VanDerWal J, Zassi‐Boulou AG, Zamudio KR. Idiosyncratic responses to climate‐driven forest fragmentation and marine incursions in reed frogs from Central Africa and the Gulf of Guinea Islands. Mol Ecol 2017; 26:5223-5244. [DOI: 10.1111/mec.14260] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 07/03/2017] [Accepted: 07/12/2017] [Indexed: 01/14/2023]
Affiliation(s)
- Rayna C. Bell
- Department of Vertebrate Zoology National Museum of Natural History Smithsonian Institution Washington DC USA
- Museum of Vertebrate Zoology University of California, Berkeley CA USA
- Department of Ecology and Evolutionary Biology Cornell University Ithaca NY USA
| | - Juan L. Parra
- Grupo de Ecología y Evolución de Vertebrados Instituto de Biología Universidad de Antioquia Medellín Colombia
| | - Gabriel Badjedjea
- Département d'Ecologie et Biodiversité des ressources Aquatiques Centre de Surveillance de la Biodiversité Kisangani Democratic Republic of the Congo
| | - Michael F. Barej
- Museum für Naturkunde ‐ Leibniz Institute for Evolution and Biodiversity Science Berlin Germany
| | - David C. Blackburn
- Florida Museum of Natural History University of Florida Gainesville FL USA
- Department of Herpetology California Academy of Sciences San Francisco CA USA
| | - Marius Burger
- African Amphibian Conservation Research Group Unit for Environmental Sciences and Management North‐West University Potchefstroom South Africa
- Flora Fauna & Man, Ecological Services Ltd. Tortola British Virgin Islands
| | - Alan Channing
- Biodiversity and Conservation Biology Department University of the Western Cape Bellville South Africa
| | - Jonas Maximilian Dehling
- Abteilung Biologie Institut für Integrierte Naturwissenschaften Universität Koblenz‐Landau Koblenz Germany
| | - Eli Greenbaum
- Department of Biological Sciences University of Texas at El Paso El Paso TX USA
| | - Václav Gvoždík
- Institute of Vertebrate Biology Czech Academy of Sciences Brno Czech Republic
- Department of Zoology National Museum Prague Czech Republic
| | - Jos Kielgast
- Section of Freshwater Biology Department of Biology University of Copenhagen Copenhagen Denmark
- Center for Macroecology, Evolution and Climate Natural History Museum of Denmark Copenhagen Denmark
| | - Chifundera Kusamba
- Laboratoire d'Herpétologie Département de Biologie Centre de Recherche en Sciences Naturelles Lwiro Democratic Republic of the Congo
| | | | | | - Zoltán T. Nagy
- Museum für Naturkunde ‐ Leibniz Institute for Evolution and Biodiversity Science Berlin Germany
- Royal Belgian Institute of Natural Sciences Brussels Belgium
| | - Mark‐Oliver Rödel
- Museum für Naturkunde ‐ Leibniz Institute for Evolution and Biodiversity Science Berlin Germany
| | - Daniel M. Portik
- Museum of Vertebrate Zoology University of California, Berkeley CA USA
- Department of Biology University of Texas Arlington TX USA
| | | | - Jeremy VanDerWal
- Centre for Tropical Biodiveristy & Climate Change College of Science and Engineering James Cook University Townsville Qld Australia
- Division of Research and Innovation eResearch Centre James Cook University Townsville Qld Australia
| | | | - Kelly R. Zamudio
- Department of Ecology and Evolutionary Biology Cornell University Ithaca NY USA
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14
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Altamiranda-Saavedra M, Arboleda S, Parra JL, Peterson AT, Correa MM. Potential distribution of mosquito vector species in a primary malaria endemic region of Colombia. PLoS One 2017; 12:e0179093. [PMID: 28594942 PMCID: PMC5464628 DOI: 10.1371/journal.pone.0179093] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Accepted: 05/23/2017] [Indexed: 11/18/2022] Open
Abstract
Rapid transformation of natural ecosystems changes ecological conditions for important human disease vector species; therefore, an essential task is to identify and understand the variables that shape distributions of these species to optimize efforts toward control and mitigation. Ecological niche modeling was used to estimate the potential distribution and to assess hypotheses of niche similarity among the three main malaria vector species in northern Colombia: Anopheles nuneztovari, An. albimanus, and An. darlingi. Georeferenced point collection data and remotely sensed, fine-resolution satellite imagery were integrated across the Urabá -Bajo Cauca-Alto Sinú malaria endemic area using a maximum entropy algorithm. Results showed that An. nuneztovari has the widest geographic distribution, occupying almost the entire study region; this niche breadth is probably related to the ability of this species to colonize both, natural and disturbed environments. The model for An. darlingi showed that most suitable localities for this species in Bajo Cauca were along the Cauca and Nechí river. The riparian ecosystems in this region and the potential for rapid adaptation by this species to novel environments, may favor the establishment of populations of this species. Apparently, the three main Colombian Anopheles vector species in this endemic area do not occupy environments either with high seasonality, or with low seasonality and high NDVI values. Estimated overlap in geographic space between An. nuneztovari and An. albimanus indicated broad spatial and environmental similarity between these species. An. nuneztovari has a broader niche and potential distribution. Dispersal ability of these species and their ability to occupy diverse environmental situations may facilitate sympatry across many environmental and geographic contexts. These model results may be useful for the design and implementation of malaria species-specific vector control interventions optimized for this important malaria region.
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Affiliation(s)
| | - Sair Arboleda
- Grupo Biología y Control de Enfermedades Infecciosas, Universidad de Antioquia, Medellín, Colombia
| | - Juan L. Parra
- Grupo de Ecología y Evolución de Vertebrados, Instituto de Biología, Universidad de Antioquia, Medellín, Colombia
| | - A. Townsend Peterson
- Biodiversity Institute, University of Kansas, Lawrence, Kansas, United States of America
| | - Margarita M. Correa
- Grupo de Microbiología Molecular, Escuela de Microbiología, Universidad de Antioquia, Medellín, Colombia
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15
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Lessard JP, Weinstein BG, Borregaard MK, Marske KA, Martin DR, McGuire JA, Parra JL, Rahbek C, Graham CH. Process-Based Species Pools Reveal the Hidden Signature of Biotic Interactions Amid the Influence of Temperature Filtering. Am Nat 2016; 187:75-88. [PMID: 27277404 DOI: 10.1086/684128] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
A persistent challenge in ecology is to tease apart the influence of multiple processes acting simultaneously and interacting in complex ways to shape the structure of species assemblages. We implement a heuristic approach that relies on explicitly defining species pools and permits assessment of the relative influence of the main processes thought to shape assemblage structure: environmental filtering, dispersal limitations, and biotic interactions. We illustrate our approach using data on the assemblage composition and geographic distribution of hummingbirds, a comprehensive phylogeny and morphological traits. The implementation of several process-based species pool definitions in null models suggests that temperature-but not precipitation or dispersal limitation-acts as the main regional filter of assemblage structure. Incorporating this environmental filter directly into the definition of assemblage-specific species pools revealed an otherwise hidden pattern of phylogenetic evenness, indicating that biotic interactions might further influence hummingbird assemblage structure. Such hidden patterns of assemblage structure call for a reexamination of a multitude of phylogenetic- and trait-based studies that did not explicitly consider potentially important processes in their definition of the species pool. Our heuristic approach provides a transparent way to explore patterns and refine interpretations of the underlying causes of assemblage structure.
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16
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Affiliation(s)
- Michael K. Borregaard
- Conservation Biogeography and Macroecology Programme; Oxford University Centre for the Environment; University of Oxford; South Parks Road Oxford OX1 3QY UK
- Center for Macroecology; Evolution and Climate; Natural History Museum of Denmark; University of Copenhagen; Universitetsparken 15 2100 Copenhagen Ø Denmark
| | - Carsten Rahbek
- Center for Macroecology; Evolution and Climate; Natural History Museum of Denmark; University of Copenhagen; Universitetsparken 15 2100 Copenhagen Ø Denmark
| | - Jon Fjeldså
- Center for Macroecology; Evolution and Climate; Natural History Museum of Denmark; University of Copenhagen; Universitetsparken 15 2100 Copenhagen Ø Denmark
| | - Juan L. Parra
- Instituto de Biología; Facultad de Ciencias Exactas y Naturales; Universidad de Antioquia; Medellín Colombia
| | - Robert J. Whittaker
- Conservation Biogeography and Macroecology Programme; Oxford University Centre for the Environment; University of Oxford; South Parks Road Oxford OX1 3QY UK
- Center for Macroecology; Evolution and Climate; Natural History Museum of Denmark; University of Copenhagen; Universitetsparken 15 2100 Copenhagen Ø Denmark
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17
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Barba C, Parra JL, Coderch L, Semenzato A. In vivo and in vitro evaluation of topical formulations containing physiological lipid mixture for replacement of skin barrier function. GIORN ITAL DERMAT V 2014; 149:347-353. [PMID: 24819763] [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: 06/03/2023]
Abstract
AIM The aim of the study was to describe a new in vivo and in vitro approach of the efficacy evaluation of cosmetic emollients to better understand the link between the formulation and the activity of cosmetic products. METHODS Two long term in vivo studies were carried out on nine healthy Caucasian volunteers mean age 40±12 years to evaluate the protecting and repairing effects of the two different barrier repair cosmetic formulations. The application of the formulations was repeated once a day during 7 days and biophysical parameters (TEWL and Skin Hydration) were measured before and after Sodium laureth sulphate exposure The in vitro study was carried out by freeze substitution transmission electron microscopy (FSTEM) on stratum corneum samples obtained by sections of fresh skin from young pigs, depleted with a solvent mixture and treated with the two products RESULTS The in vivo results demonstrated that daily product application provided a reinforcement of the skin barrier with protecting and repairing effects from chemical injuries the extent of which was dependent on the formulation features (product A>product B) The role of the technical form on the lipid availability was confirmed by the in vitro evaluation tests. CONCLUSION The results point out that a daily application of physiological lipid mixture containing emulsion can protect healthy skin and promote the reparing effect on unpaired barrier skin, reducing TEWL and maintaining hydration of the stratum corneum. The efficacy degree is higher when the cosmetic form promotes the availability of active ingredients increasing the product performance.
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Affiliation(s)
- C Barba
- IQAC-CSIC, Barcelona, Spain -
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18
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Menéndez E, Álvaro AM, Hernández MT, Parra JL. New methodology for assessing the environmental burden of cement mortars with partial replacement of coal bottom ash and fly ash. J Environ Manage 2014; 133:275-283. [PMID: 24412590 DOI: 10.1016/j.jenvman.2013.12.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [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: 07/11/2013] [Revised: 10/18/2013] [Accepted: 12/01/2013] [Indexed: 06/03/2023]
Abstract
This paper assess the mechanical an environmental behaviour of cement mortars manufactured with addition of fly ash (FA) and bottom ash (BA), as partial cement replacement (10%, 25% and 35%). The environmental behaviour was studied by leaching tests, which were performed under several temperature (23 °C and 60 °C) and pH (5 and 10) conditions, and ages (1, 2, 4 and 7 days). Then, the accumulated amount of the different constituents leached was analysed. In order to obtain an environmental burden (EB) value of each cement mixture, a new methodology was developed. The EB value obtained is related to the amount leached and the hazardous level of each constituent. Finally, the integral study of compressive strength and EB values of cement mixtures allowed their classification. The results showed that mortars manufactured with ordinary Portland cement (OPC) and with coal BA had similar or even better environmental and mechanical behaviour than mortars with FA. Therefore, the partial replacement of cement by BA might be as suitable or even better as the replacement by FA.
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Affiliation(s)
- E Menéndez
- Eduardo Torroja Institute of Construction Science (IETcc-CSIC), Spain.
| | - A M Álvaro
- Eduardo Torroja Institute of Construction Science (IETcc-CSIC), Spain; ETSIT - Polytechnic University of Madrid (UPM), Spain
| | - M T Hernández
- EUITI - Polytechnic University of Madrid (UPM), Spain
| | - J L Parra
- ETSIM - Polytechnic University of Madrid (UPM), Spain
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19
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Scaltriti M, Nuciforo P, Bradbury I, Sperinde J, Serra V, Parra JL, Prudkin L, Harbeck N, Pusztai L, Ellis C, Eidtmann H, Arribas J, Piccart M, Baselga J. Abstract P1-08-42: High HER2 expression correlates with response to trastuzumab and the combination of trastuzumab and lapatinib in the NeoALTTO phase III trial. Cancer Res 2013. [DOI: 10.1158/0008-5472.sabcs13-p1-08-42] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: Expression of p95HER2, a truncated form of HER2 lacking the extracellular domain, has been associated with resistance to trastuzumab (T)-based therapy in metastatic breast cancer patients. Conversely, high levels of HER2 have been correlated with increased clinical benefit from anti-HER2 therapy in the neoadjuvant setting. In this work we correlated the expression of p95HER2 and HER2 with pathological complete response (pCR) following T, lapatinib (L) or the combination of both agents (T+L) with paclitaxel.
Methods: p95HER2 and HER2 were quantified by VeraTag® and HERmark® (Monogram Biosciences), respectively, in primary tumors of 455 patients enrolled in the phase III neoadjuvant study NeoALTTO (Baselga J. et al. Lancet, 2012). The relationship of pCR status to p95HER2 and HER2 was studied using logistic regression models, which accounted for stratification factors and treatment. Unless specified, p95HER2 and HER2 were included as log terms.
Results: p95HER2 was measurable in 283 cases (62%) and HER2 in 327 cases (72%). A positive correlation between p95HER2 and HER2 levels was found in the 274 cases (60%) where quantification of both markers was available. Increased HER2 was strongly associated with increased pCR rate in patients treated with the combination of T+L (OR 5.09, 95%CI 2.27-11.44; p<0.01), with a trend observed also in the L-only arm (OR 1.88, 95% CI 0.96-3.70; p = 0.067). Overall, patients with tumors that were HER2-positive (>17.8 RF/mm2) by HERmark had a higher pCR rate than those that were HER2-negative by HERmark (39% vs. 11%, respectively; p<0.001). Increasing p95HER2 levels did not predict for pCR in the L or T+L arms and showed weak evidence (p = 0.073) of an increase in pCR in the T arm.
In an unplanned analysis, we examined the odds of achieving response to anti-HER2 therapy in patients with HER2 levels above and below the median (100 RF/mm2, HER2 entered as a binary covariate). HER2 levels above the median predicted a higher response rate to T (OR 3.6, 95% CI 1.2-11; p<0.05) and, more significantly, to T+L (OR 6.01, 95% CI 2.51-14.4; p<0.001). In particular, patients treated with T+L had a higher probability to achieve pCR compared to T alone when HER2 was above the median (T+L = 73% pCR vs. T = 43% pCR, p<0.01; OR 3.74, 95% CI 1.57-8.90), but not when HER2 was below the median (T+L = 29% pCR vs. T = 19% pCR, p>0.2; OR 1.84, 95% CI 0.74-4.55). When tumors were divided in hormone receptor (HR)-positive and HR-negative groups, total levels of HER2 still predicted response to T or T+L.
Conclusions: Increasing HER2 protein expression correlated with increased benefit of adding L to T compared to T alone. In tumors above the median of HER2 expression, the levels of HER2 predicted for response to both T and T+L. Our interpretation is that, in the neoadjuvant setting, the association between p95HER2 expression and response to anti-HER2 therapy is likely a consequence of the correlation between p95HER2 and total HER2 levels. HER2 expression seems to be a stronger predictor of pCR than p95HER2 for response to T, L and especially, T+L. Future studies to understand the impact of p95HER2 and HER2 expression on disease-free and overall survival following anti-HER2 therapy are warranted.
Citation Information: Cancer Res 2013;73(24 Suppl): Abstract nr P1-08-42.
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Affiliation(s)
- M Scaltriti
- Memorial Sloan Kettering Cancer Center; Vall d'Hebron Institute of Oncology; Frontier Science Scotland; Monogram Biosciences; Ludwig Maximilian University; Yale School of Medicine; GlaxoSmithKline; University Hospital Kiel; Jules Bordet Institute
| | - P Nuciforo
- Memorial Sloan Kettering Cancer Center; Vall d'Hebron Institute of Oncology; Frontier Science Scotland; Monogram Biosciences; Ludwig Maximilian University; Yale School of Medicine; GlaxoSmithKline; University Hospital Kiel; Jules Bordet Institute
| | - I Bradbury
- Memorial Sloan Kettering Cancer Center; Vall d'Hebron Institute of Oncology; Frontier Science Scotland; Monogram Biosciences; Ludwig Maximilian University; Yale School of Medicine; GlaxoSmithKline; University Hospital Kiel; Jules Bordet Institute
| | - J Sperinde
- Memorial Sloan Kettering Cancer Center; Vall d'Hebron Institute of Oncology; Frontier Science Scotland; Monogram Biosciences; Ludwig Maximilian University; Yale School of Medicine; GlaxoSmithKline; University Hospital Kiel; Jules Bordet Institute
| | - V Serra
- Memorial Sloan Kettering Cancer Center; Vall d'Hebron Institute of Oncology; Frontier Science Scotland; Monogram Biosciences; Ludwig Maximilian University; Yale School of Medicine; GlaxoSmithKline; University Hospital Kiel; Jules Bordet Institute
| | - JL Parra
- Memorial Sloan Kettering Cancer Center; Vall d'Hebron Institute of Oncology; Frontier Science Scotland; Monogram Biosciences; Ludwig Maximilian University; Yale School of Medicine; GlaxoSmithKline; University Hospital Kiel; Jules Bordet Institute
| | - L Prudkin
- Memorial Sloan Kettering Cancer Center; Vall d'Hebron Institute of Oncology; Frontier Science Scotland; Monogram Biosciences; Ludwig Maximilian University; Yale School of Medicine; GlaxoSmithKline; University Hospital Kiel; Jules Bordet Institute
| | - N Harbeck
- Memorial Sloan Kettering Cancer Center; Vall d'Hebron Institute of Oncology; Frontier Science Scotland; Monogram Biosciences; Ludwig Maximilian University; Yale School of Medicine; GlaxoSmithKline; University Hospital Kiel; Jules Bordet Institute
| | - L Pusztai
- Memorial Sloan Kettering Cancer Center; Vall d'Hebron Institute of Oncology; Frontier Science Scotland; Monogram Biosciences; Ludwig Maximilian University; Yale School of Medicine; GlaxoSmithKline; University Hospital Kiel; Jules Bordet Institute
| | - C Ellis
- Memorial Sloan Kettering Cancer Center; Vall d'Hebron Institute of Oncology; Frontier Science Scotland; Monogram Biosciences; Ludwig Maximilian University; Yale School of Medicine; GlaxoSmithKline; University Hospital Kiel; Jules Bordet Institute
| | - H Eidtmann
- Memorial Sloan Kettering Cancer Center; Vall d'Hebron Institute of Oncology; Frontier Science Scotland; Monogram Biosciences; Ludwig Maximilian University; Yale School of Medicine; GlaxoSmithKline; University Hospital Kiel; Jules Bordet Institute
| | - J Arribas
- Memorial Sloan Kettering Cancer Center; Vall d'Hebron Institute of Oncology; Frontier Science Scotland; Monogram Biosciences; Ludwig Maximilian University; Yale School of Medicine; GlaxoSmithKline; University Hospital Kiel; Jules Bordet Institute
| | - M Piccart
- Memorial Sloan Kettering Cancer Center; Vall d'Hebron Institute of Oncology; Frontier Science Scotland; Monogram Biosciences; Ludwig Maximilian University; Yale School of Medicine; GlaxoSmithKline; University Hospital Kiel; Jules Bordet Institute
| | - J Baselga
- Memorial Sloan Kettering Cancer Center; Vall d'Hebron Institute of Oncology; Frontier Science Scotland; Monogram Biosciences; Ludwig Maximilian University; Yale School of Medicine; GlaxoSmithKline; University Hospital Kiel; Jules Bordet Institute
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20
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Velo-Antón G, Parra JL, Parra-Olea G, Zamudio KR. Tracking climate change in a dispersal-limited species: reduced spatial and genetic connectivity in a montane salamander. Mol Ecol 2013; 22:3261-78. [PMID: 23710831 DOI: 10.1111/mec.12310] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [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: 10/18/2012] [Revised: 02/18/2013] [Accepted: 02/26/2013] [Indexed: 11/29/2022]
Abstract
Tropical montane taxa are often locally adapted to very specific climatic conditions, contributing to their lower dispersal potential across complex landscapes. Climate and landscape features in montane regions affect population genetic structure in predictable ways, yet few empirical studies quantify the effects of both factors in shaping genetic structure of montane-adapted taxa. Here, we considered temporal and spatial variability in climate to explain contemporary genetic differentiation between populations of the montane salamander, Pseudoeurycea leprosa. Specifically, we used ecological niche modelling (ENM) and measured spatial connectivity and gene flow (using both mtDNA and microsatellite markers) across extant populations of P. leprosa in the Trans-Mexican Volcanic Belt (TVB). Our results indicate significant spatial and genetic isolation among populations, but we cannot distinguish between isolation by distance over time or current landscape barriers as mechanisms shaping population genetic divergences. Combining ecological niche modelling, spatial connectivity analyses, and historical and contemporary genetic signatures from different classes of genetic markers allows for inference of historical evolutionary processes and predictions of the impacts future climate change will have on the genetic diversity of montane taxa with low dispersal rates. Pseudoeurycea leprosa is one montane species among many endemic to this region and thus is a case study for the continued persistence of spatially and genetically isolated populations in the highly biodiverse TVB of central Mexico.
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Affiliation(s)
- G Velo-Antón
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, 14853, USA
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21
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Fuchs J, Parra JL, Goodman SM, Raherilalao MJ, Vanderwal J, Bowie RCK. Extending ecological niche models to the past 120 000 years corroborates the lack of strong phylogeographic structure in the Crested Drongo (Dicrurus forficatus forficatus) on Madagascar. Biol J Linn Soc Lond 2013. [DOI: 10.1111/j.1095-8312.2012.02022.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Jérôme Fuchs
- Museum of Vertebrate Zoology and Department of Integrative Biology; University of California; 3101 Valley Life Science Building Berkeley CA 94720-3160 USA
- Percy FitzPatrick Institute; DST/NRF Centre of Excellence; University of Cape Town; Rondebosch 7701 South Africa
| | - Juan L. Parra
- Instituto de Biología; Facultad de Ciencias Exactas y Naturales; Universidad de Antioquia; Medellín Colombia
| | - Steven M. Goodman
- Field Museum of Natural History; 1400 South Lake Shore Drive Chicago IL 60605 USA
- Association Vahatra; BP 3972 Antananarivo 101 Madagascar
| | - Marie Jeanne Raherilalao
- Association Vahatra; BP 3972 Antananarivo 101 Madagascar
- Département de Biologie Animale; Université d'Antananarivo; BP 906 Antananarivo 101 Madagascar
| | - Jeremy Vanderwal
- Centre for Tropical Biodiversity & Climate Change; School of Marine and Tropical Biology; James Cook University; Townsville QLD 4811 Australia
| | - Rauri C. K. Bowie
- Museum of Vertebrate Zoology and Department of Integrative Biology; University of California; 3101 Valley Life Science Building Berkeley CA 94720-3160 USA
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22
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Graham CH, Parra JL, Tinoco BA, Stiles FG, McGuire JA. Untangling the influence of ecological and evolutionary factors on trait variation across hummingbird assemblages. Ecology 2012. [DOI: 10.1890/11-0493.1] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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González-Caro S, Parra JL, Graham CH, McGuire JA, Cadena CD. Sensitivity of metrics of phylogenetic structure to scale, source of data and species pool of hummingbird assemblages along elevational gradients. PLoS One 2012; 7:e35472. [PMID: 22558157 PMCID: PMC3338702 DOI: 10.1371/journal.pone.0035472] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2011] [Accepted: 03/19/2012] [Indexed: 12/02/2022] Open
Abstract
Patterns of phylogenetic structure of assemblages are increasingly used to gain insight into the ecological and evolutionary processes involved in the assembly of co-occurring species. Metrics of phylogenetic structure can be sensitive to scaling issues and data availability. Here we empirically assess the sensitivity of four metrics of phylogenetic structure of assemblages to changes in (i) the source of data, (ii) the spatial grain at which assemblages are defined, and (iii) the definition of species pools using hummingbird (Trochilidae) assemblages along an elevational gradient in Colombia. We also discuss some of the implications in terms of the potential mechanisms driving these patterns. To explore how source of data influence phylogenetic structure we defined assemblages using three sources of data: field inventories, museum specimens, and range maps. Assemblages were defined at two spatial grains: coarse-grained (elevational bands of 800-m width) and fine-grained (1-km2 plots). We used three different species pools: all species contained in assemblages, all species within half-degree quadrats, and all species either above or below 2000 m elevation. Metrics considering phylogenetic relationships among all species within assemblages showed phylogenetic clustering at high elevations and phylogenetic evenness in the lowlands, whereas those metrics considering only the closest co-occurring relatives showed the opposite trend. This result suggests that using multiple metrics of phylogenetic structure should provide greater insight into the mechanisms shaping assemblage structure. The source and spatial grain of data had important influences on estimates of both richness and phylogenetic structure. Metrics considering the co-occurrence of close relatives were particularly sensitive to changes in the spatial grain. Assemblages based on range maps included more species and showed less phylogenetic structure than assemblages based on museum or field inventories. Coarse-grained assemblages included more distantly related species and thus showed a more even phylogenetic structure than fine-grained assemblages. Our results emphasize the importance of carefully selecting the scale, source of data and metric used in analysis of the phylogenetic structure of assemblages.
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Affiliation(s)
- Sebastián González-Caro
- Laboratorio de Biología Evolutiva de Vertebrados, Departamento de Ciencias Biológicas, Universidad de los Andes, Bogotá, Colombia
| | - Juan L. Parra
- Instituto de Biología, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia, Medellín, Colombia
- Department of Ecology and Evolution, Stony Brook University, Stony Brook, New York, United States of America
- * E-mail:
| | - Catherine H. Graham
- Department of Ecology and Evolution, Stony Brook University, Stony Brook, New York, United States of America
| | - Jimmy A. McGuire
- Department of Integrative Biology, University of California, Berkeley, California, United States of America
| | - Carlos Daniel Cadena
- Laboratorio de Biología Evolutiva de Vertebrados, Departamento de Ciencias Biológicas, Universidad de los Andes, Bogotá, Colombia
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Bell RC, Parra JL, Tonione M, Hoskin CJ, Mackenzie JB, Williams SE, Moritz C. Patterns of persistence and isolation indicate resilience to climate change in montane rainforest lizards. Mol Ecol 2010; 19:2531-44. [PMID: 20497322 DOI: 10.1111/j.1365-294x.2010.04676.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Globally, montane tropical diversity is characterized by extraordinary local endemism that is not readily explained by current environmental variables indicating a strong imprint of history. Montane species often exist as isolated populations under current climatic conditions and may have remained isolated throughout recent climatic cycles, leading to substantial genetic and phenotypic divergence. Alternatively, populations may have become contiguous during colder climates resulting in less divergence. Here we compare responses to historical climate fluctuation in a montane specialist skink, Lampropholis robertsi, and its more broadly distributed congener, L. coggeri, both endemic to rainforests of northeast Australia. To do so, we combine spatial modelling of potential distributions under representative palaeoclimates, multi-locus phylogeography and analyses of phenotypic variation. Spatial modelling of L. robertsi predicts strong isolation among disjunct montane refugia during warm climates, but with potential for localized exchange during the most recent glacial period. In contrast, predicted stable areas are more widespread and connected in L. coggeri. Both species exhibit pronounced phylogeographic structuring for mitochondrial and nuclear genes, attesting to low dispersal and high persistence across multiple isolated regions. This is most prominent in L. robertsi, for which coalescent analyses indicate that most populations persisted in isolation throughout the climate cycles of the Pleistocene. Morphological divergence, principally in body size, is more evident among isolated populations of L. robertsi than L. coggeri. These results highlight the biodiversity value of isolated montane populations and support the general hypothesis that tropical montane regions harbour high levels of narrow-range taxa because of their resilience to past climate change.
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Affiliation(s)
- Rayna C Bell
- Museum of Vertebrate Zoology, University of California, Berkeley, CA 94720, USA.
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Ramírez R, Martí M, Barba C, Méndez S, Parra JL, Coderch L. Skin efficacy of liposomes composed of internal wool lipids rich in ceramides. J Cosmet Sci 2010; 61:235-245. [PMID: 20587352] [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] [Accepted: 11/16/2009] [Indexed: 05/29/2023]
Abstract
Ceramides from intercellular lipids of skin stratum corneum are known to play an essential role in maintaining and structuring the lipid barrier of the skin. Internal wool lipids (IWL), which are also rich in ceramides, have a composition similar to that of the stratum corneum lipids. IWL extracted with chloroform/methanol azeotrope at the laboratory scale have been shown to be capable of forming liposomes with a stable bilayer structure. Furthermore, topical application of these IWL liposomes on intact and compromised skin has been demonstrated to improve barrier skin properties.In this study we evaluated the effect on human skin repair of different IWL extract compositions obtained by two extraction methodologies. The formation and characteristics of the liposomes prepared were greatly influenced by the IWL composition, primarily the sterol sulfate content. The IWL liposomes improved skin barrier integrity and increased skin hydration when applied onto intact skin. These improvements were slightly enhanced in the case of IWL liposomes that were richer in polar lipids.
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Affiliation(s)
- R Ramírez
- Department of Chemical and Surfactant Technology, IQAC (CSIC), Barcelona, Spain
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Abstract
How biotic interactions, current and historical environment, and biogeographic barriers determine community structure is a fundamental question in ecology and evolution, especially in diverse tropical regions. To evaluate patterns of local and regional diversity, we quantified the phylogenetic composition of 189 hummingbird communities in Ecuador. We assessed how species and phylogenetic composition changed along environmental gradients and across biogeographic barriers. We show that humid, low-elevation communities are phylogenetically overdispersed (coexistence of distant relatives), a pattern that is consistent with the idea that competition influences the local composition of hummingbirds. At higher elevations communities are phylogenetically clustered (coexistence of close relatives), consistent with the expectation of environmental filtering, which may result from the challenge of sustaining an expensive means of locomotion at high elevations. We found that communities in the lowlands on opposite sides of the Andes tend to be phylogenetically similar despite their large differences in species composition, a pattern implicating the Andes as an important dispersal barrier. In contrast, along the steep environmental gradient between the lowlands and the Andes we found evidence that species turnover is comprised of relatively distantly related species. The integration of local and regional patterns of diversity across environmental gradients and biogeographic barriers provides insight into the potential underlying mechanisms that have shaped community composition and phylogenetic diversity in one of the most species-rich, complex regions of the world.
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Affiliation(s)
- Catherine H. Graham
- Department of Ecology and Evolution, Stony Brook University, 650 Life Sciences Building, Stony Brook, NY 11784-5245
| | - Juan L. Parra
- Department of Ecology and Evolution, Stony Brook University, 650 Life Sciences Building, Stony Brook, NY 11784-5245
| | - Carsten Rahbek
- Center for Macroecology, Evolution, and Climate, Department of Biology, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark; and
| | - Jimmy A. McGuire
- Museum of Vertebrate Zoology, University of California, 3101 Valley Life Sciences Building, Berkeley, CA 94720-3160
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Scaltriti M, Verma C, Guzman M, Jimenez J, Parra JL, Pedersen K, Smith DJ, Landolfi S, Ramon y Cajal S, Arribas J, Baselga J. Lapatinib, a HER2 tyrosine kinase inhibitor, induces stabilization and accumulation of HER2 and potentiates trastuzumab-dependent cell cytotoxicity. Oncogene 2008; 28:803-14. [DOI: 10.1038/onc.2008.432] [Citation(s) in RCA: 315] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Maza A, Parra JL, Coderch L, Bosch P. Phosphatidylcholine/cholesterol liposomes as vehicles for anthraquinone disperse dyes in wool dyeing. ACTA ACUST UNITED AC 2008. [DOI: 10.1111/j.1478-4408.1995.tb01673.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Maza A, Parra JL, Manich A, Coderch L. Liposomes in wool dyeing — the stability of dye‐liposome systems and their application to untreated wool fibres. ACTA ACUST UNITED AC 2008. [DOI: 10.1111/j.1478-4408.1992.tb01408.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A Maza
- Institute de Tecnologia Quimica y Textil (CSIC) C/Jorge Girona Salgado 18–26, 08034 Barcelona, Spain
| | - J L Parra
- Institute de Tecnologia Quimica y Textil (CSIC) C/Jorge Girona Salgado 18–26, 08034 Barcelona, Spain
| | - A Manich
- Institute de Tecnologia Quimica y Textil (CSIC) C/Jorge Girona Salgado 18–26, 08034 Barcelona, Spain
| | - L Coderch
- Institute de Tecnologia Quimica y Textil (CSIC) C/Jorge Girona Salgado 18–26, 08034 Barcelona, Spain
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Maza A, Coderch L, Serra S, Parra JL. Phosphatidylcholine unilamellar liposomes as vehicles for a 1:2 metal-complex dye in wool dyeing. ACTA ACUST UNITED AC 2008. [DOI: 10.1111/j.1478-4408.1997.tb01891.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Affiliation(s)
- L Coderch
- Instituto de Tecnologia Quimica y Textil (CSIC), Jorge Girona Salgado 18–26, 08034 Barcelona, Spain
| | - A M Manich
- Instituto de Tecnologia Quimica y Textil (CSIC), Jorge Girona Salgado 18–26, 08034 Barcelona, Spain
| | - J L Parra
- Instituto de Tecnologia Quimica y Textil (CSIC), Jorge Girona Salgado 18–26, 08034 Barcelona, Spain
| | - P Erra
- Instituto de Tecnologia Quimica y Textil (CSIC), Jorge Girona Salgado 18–26, 08034 Barcelona, Spain
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Abstract
The aim of our study was to determine the influence of several types of liposomes with a different lipid composition on the percutaneous absorption of one conventional sun filter with a lipophilic character (ethyl hexyl methoxycinnamate) using both in vitro and in vivo methodologies. Three different liposomes were prepared with unsaturated and saturated phosphatidylcholine (PC, HPC), and with a wool lipid mixture (IWL) with a composition similar to that of the stratum corneum lipids. Results showed that the liquid crystalline state associated with PC liposomes plays a key role in enhancing skin penetration. when liposomes with a composition and structural organization similar to that of the stratum corneum lipids (HPC and IWL) are used, the skin penetration is retarded, suggesting a certain reinforcement of the stratum corneum barrier. These two types of liposomes could be regarded as alternatives to conventional oil/water emulsions in the formulations of lipidic sun filters. Finally, an acceptable correlation was obtained using both in vitro and in vivo methodologies to evaluate the corresponding skin absorption profile.
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Affiliation(s)
- E Ramón
- IIQAB (CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain.
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Barba C, Méndez S, Roddick-Lanzilotta A, Kelly R, Parra JL, Coderch L. Cosmetic effectiveness of topically applied hydrolysed keratin peptides and lipids derived from wool. Skin Res Technol 2008; 14:243-8. [PMID: 18412569 DOI: 10.1111/j.1600-0846.2007.00280.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND/PURPOSE Skin moisturisation, elasticity, feel and appearance can all be improved through the topical application of protein hydrolysates. Recent studies suggest that supplementing intercellular lipids of the stratum corneum can enhance the functioning of the skin. METHODS In this study, a hydrolysed keratin peptide (molecular weight <1000 Da) was prepared from wool and tested on skin in two different formulations: an aqueous solution and an internal wool lipids (IWL) liposome suspension. In vivo long-term studies were performed to evaluate the water barrier function of the skin after topical application of different formulations. During the treatment period, hydration and elasticity were determined. A sorption-desorption test was also performed to assess the hygroscopic properties and water-holding capacity of the different treated skin sites. RESULTS Significant differences were found between the control and treated sites, with the treated areas showing an increase in hydration and elasticity as a result of keratin peptide application. Measurements also indicated that the keratin formulations reinforce the skin barrier integrity, improving its water-holding capacity. CONCLUSION A combination of the keratin peptide with the IWL showed beneficial effects, indicating that this combination is suitable for designing new cosmetics products.
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Affiliation(s)
- C Barba
- Department of Surfactant Technology, Chemical and Environmental Research Institute of Barcelona, Barcelona, Spain.
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Barba C, Méndez S, Roddick-Lanzilotta A, Kelly R, Parra JL, Coderch L. Wool peptide derivatives for hand care. J Cosmet Sci 2007; 58:99-107. [PMID: 17520151] [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] [Accepted: 01/23/2007] [Indexed: 05/15/2023]
Abstract
Hands experience much greater wear and tear during normal daily routines compared with most other parts of the body, and thereby demand specific needs from cosmetics targeted at hand care. Keratin proteins are the major structural component of the outer layers of the skin. In this work a novel keratin fraction from wool, which has high cystine content present in the S-sulphonated form, has been developed to target hand care applications. In vivo long-term studies were performed to evaluate the water-holding capacity and elasticity of hand skin following topical application of keratins. Moreover, protection of healthy skin against detergent-induced dermatitis was evaluated after topical application of the keratin-active formulation. Significant results in the measured biophysical parameters were found, which indicated an improvement in the skin's water-holding capacity, hydration, and elasticity for volunteers with dry skin as a result of the keratin peptide treatment. Results also indicated that the keratin peptide treatment can prevent some of the damaging effects associated with surfactant exposure.
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Affiliation(s)
- C Barba
- IIQAB (CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain
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López O, López-Iglesias C, Cócera M, Walther P, Parra JL, De La Maza A. Influence of chemical and freezing fixation methods in the freeze-fracture of stratum corneum. J Struct Biol 2005; 146:302-9. [PMID: 15099572 DOI: 10.1016/j.jsb.2004.01.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2003] [Revised: 11/27/2003] [Indexed: 11/23/2022]
Abstract
A comparison between two fixation techniques for freeze-fracture was established. Stratum corneum (SC) samples from pig epidermis were fixed using high-pressure freezing (HPF) and using plunging in propane freezing; the latter after chemical fixation. Then, frozen samples were freeze-fractured, coated with platinum-carbon, and visualized using a high-resolution low-temperature scanning electron microscope and a transmission electron microscope. Our results indicate that the plane of freeze-fracture was different depending on the fixation and freezing methodology used. In the samples frozen by HPF without chemical fixation, the fracture plane laid mainly between the lipid lamellae. However, when chemical fixation and plunging in propane freezing was used, the fracture plane did not show preference to a specific way. Plunging in propane freezing of chemically fixed samples, on the other hand, provides a more homogeneous fracture behaviour. Thus, depending on the methodology used, we can favour a visualization of either lipid or protein domains of the SC. These results could be very useful in future ultrastructural studies in order to facilitate the microscopic visualization and interpretation of the complex images such as those of SC and even of other samples in which different domains coexist.
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Affiliation(s)
- O López
- Departamento de Tecnología de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona, Consejo Superior de Investigaciones Científicas, Calle Jorge Girona 18-26, 08034 Barcelona, Spain.
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Abstract
Since the early part of the 20th century, diagnostic laparoscopy has become an important tool in the armamentarium of surgeons and gastroenterologists alike. Its indications have expanded from initial attempts at tamponading internal hemorrhage to avoidance of unnecessary laparotomies with accurate staging of malignancies, treatment of a multitude of intra-abdominal pathologies, and even as a resource for evaluating blunt abdominal trauma and chronic abdominal pain. Its accuracy has been demonstrated in the evaluation of chronic liver diseases, in comparison with other diagnostic modalities. Many further technical advances have been introduced in recent years. Gastroenterology training programs should include formal diagnostic laparoscopy training as part of their curriculum.
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Affiliation(s)
- J L Parra
- Dept. of Gastroenterology, University of Miami School of Medicine, Jackson Memorial Hospital Miami, Florida, USA
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Alonso C, Ramón E, Lozano C, Parra JL, Torres JL, Coderch L. Percutaneous absorption of flavan-3-ol conjugates from plant procyanidins. Drugs Exp Clin Res 2004; 30:1-10. [PMID: 15134385] [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: 04/29/2023]
Abstract
Catechins (flavanols) are strong antioxidants, free radical scavengers and inhibitors of lipid peroxidation. New bio-based antioxidant compounds obtained by depolymerization of plant polymeric flavanols (procyanidins) in the presence of cysteine or cysteamine, as well as their underivatized counterpart, (-)-epicatechin, were evaluated in terms of their percutaneous absorption profiles taking into account their free radical scavenging efficiency. The evaluation of the percutaneous absorption of flavanols was carried out by an in vitro methodology using both pig and human skin. A good correlation was obtained using both skins in the evaluation of the skin absorption profiles. It can be deduced that 4beta-(S-cysteinyl)epicatechin (Cys-Ec) has a tendency to be located mainly in the outermost layers of the skin, whereas 4beta-(2-aminoethylthio)epicatechin (Cya-Ec) has a pronounced percutaneous absorption capacity. Their antioxidant properties and their skin penetration profiles support their potential cosmetic or pharmacological applications.
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Affiliation(s)
- C Alonso
- Chemical and Environmental Research Institute, IIQAB, Consejo Superior de Investigaciones Científicas, Barcelona, Spain
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Cócera M, López O, Estelrich J, Parra JL, de la Maza A. Influence of the temperature in the adsorption of sodium dodecyl sulfate on phosphatidylcholine liposomes. Chem Phys Lipids 2003; 124:15-22. [PMID: 12787940 DOI: 10.1016/s0009-3084(03)00022-7] [Citation(s) in RCA: 11] [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: 11/27/2022]
Abstract
The influence of the temperature on the adsorption of monomeric and micellar solutions of the anionic surfactant sodium dodecyl sulfate (SDS) on phosphatidylcholine (PC) liposomes was investigated using the fluorescent probe 2-(p-toluidinyl)-naphthalene-6-sodium sulfonate (TNS). The number of adsorbed molecules was quantified by measuring changes in the electrostatic potential (Psi(o)) of the liposomes/probe during an incubation with SDS at varying temperatures. At low surfactant concentrations (from 0.05 to 0.25 mM), the increase in temperature reduced the number of surfactant molecules incorporated per vesicle regardless of the incubation time, whereas at high surfactant concentrations (from 0.50 to 1.0 mM) the incubation time has an opposite effect on this process. Thus, after 10s, the surfactant adsorption decreased with temperature, yet it increased progressively with time. The adsorption was linear with temperature below critical micellar concentration (CMC) of SDS and this linear tendency did not change above CMC. This suggests an adsorption of SDS monomers regardless of the surfactant concentration.
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Affiliation(s)
- M Cócera
- Departamento de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona, Consejo Superior de Investigaciones Científicas, C/Jordi Girona, 18-16, 08034 Barcelona, Spain
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Abstract
The pH of the skin follows a sharp gradient across the stratum corneum (SC), which is suspected to play an important role in controlling the enzymatic activities involved in cellular metabolism and renewal. This gradient is maintained by several systems, such as sweat and sebum secretion and degradation as well as cellular metabolism. At the surface of the skin, what is measured is in fact an apparent skin pH due to extracted material from the SC diffusing into water applied at the surface. pH values recorded at the surface of a semi hydrophobic milieu such as the SC should be interpreted with great caution because it is obvious that hydrogen ions are not in a pure solution at the surface of the skin. For a correct measurement of skin surface pH, it is recommended to follow all practical operating conditions. Care must be taken in identifying the skin site, healthy controls (age, gender, skin type), the time of day of the measurement and the environmental conditions. Also, subjects should receive precise instructions before the test, mainly in terms of hygiene procedure or use of topical products. The interpretation of data should not overlook the fact that even small differences in pH may reflect significant modifications at the molecular level. Although it is usually agreed that the pH of the skin surface may influence the cutaneous microflora, much remains to be learnt about the role of the acid mantle of the skin with regard to defensins and other protective mechanisms.
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Affiliation(s)
- J L Parra
- Department of Surfactants, Instituto de Investigaciones Químicas y Ambientales de Barcelona (CSIC), Barcelona, Spain.
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Nieto JM, Madrid C, Miquelay E, Parra JL, Rodríguez S, Juárez A. Evidence for direct protein-protein interaction between members of the enterobacterial Hha/YmoA and H-NS families of proteins. J Bacteriol 2002; 184:629-35. [PMID: 11790731 PMCID: PMC139531 DOI: 10.1128/jb.184.3.629-635.2002] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.1] [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: 11/20/2022] Open
Abstract
Escherichia coli nucleoid-associated H-NS protein interacts with the Hha protein, a member of a new family of global modulators that also includes the YmoA protein from Yersinia enterocolitica. This interaction has been found to be involved in the regulation of the expression of the toxin alpha-hemolysin. In this study, we further characterize the interaction between H-NS and Hha. We show that the presence of DNA in preparations of copurified His-Hha and H-NS is not directly implicated in the interaction between the proteins. The precise molecular mass of the H-NS protein retained by Hha, obtained by mass spectrometry analysis, does not show any posttranslational modification other than removal of the N-terminal Met residue. We constructed an H-NS-His recombinant protein and found that, as expected, it interacts with Hha. We used a Ni(2+)-nitrilotriacetic acid agarose method for affinity chromatography copurification of proteins to identify the H-NS protein of Y. enterocolitica. We constructed a six-His-YmoA recombinant protein derived from YmoA, the homologue of Hha in Y. enterocolitica, and found that it interacts with Y. enterocolitica H-NS. We also cloned and sequenced the hns gene of this microorganism. In the course of these experiments we found that His-YmoA can also retain H-NS from E. coli. We also found that the hns gene of Y. enterocolitica can complement an hns mutation of E. coli. Finally, we describe for the first time systematic characterization of missense mutant alleles of hha and truncated Hha' proteins, and we report a striking and previously unnoticed similarity of the Hha family of proteins to the oligomerization domain of the H-NS proteins.
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Affiliation(s)
- J M Nieto
- Departament de Microbiologia, Facultat de Biologia, Universitat de Barcelona, Avda. Diagonal 645, 08028 Barcelona, Spain
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Cócera M, López O, Sabés M, Parra JL, Guinea J, de la Maza A. Assembly properties and applications of a new exopolymeric compound excreted by Pseudoalteromonas antarctica NF3. J Biomater Sci Polym Ed 2002; 12:409-27. [PMID: 11436977 DOI: 10.1163/156856201750195298] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The self assembly properties and applications of an exopolymeric compound (EC) of a glycoprotein character excreted by a new gram-negative species, Pseudoalteromonas antarctica NF3, have been reviewed. This compound exhibited surface-active properties in water, with a concentration of 0.20 mg ml(-1) being the key value associated with its physicochemical properties. Unsonicated EC aqueous dispersions showed the coexistence of concentric multilamellar and small unilamellar aggregates by transmission electron microscopy (TEM). Sonication of these dispersions revealed that each lamellae of the initial multilamellar structures were made up of various subunits coiled coils. As for the ability of this exopolymeric biomaterial to coat phosphatidylcholine (PC) liposomes and to protect these vesicles against different surfactants, freeze-fracture TEM micrographs of liposome/EC aggregates revealed that the addition of the EC to liposomes led to the formation of a film (polymer adsorbed onto the bilayers) that coated very well the PC bilayers. The complete coating was already achieved at a PC:EC weight ratio of about 9:1. An increasing resistance of PC liposomes to surfactants (in particular sodium dodecyl sulfate) occurred as the proportion of EC in the system rose, although this effect was more effective at low EC proportions (PC:EC weight ratios from 9:1 to 8:2). Although a direct dependence was found between the growth of the enveloping structure and the resistance of the coated liposomes to be affected by the surfactants, the best protection occurred when this structure was a thin film of about 20-25 nm formed by nine to ten layers of about 2-3 nm.
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Affiliation(s)
- M Cócera
- Departamento de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona, Consejo Superior de Investigaciones Cientificas, Spain
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Cócera M, López O, Coderch L, Mercadé ME, Parra JL, de la Maza A, Guinea J. Partitioning of SDS in liposomes coated by the exopolymer excreted by Pseudoalteromonas antarctica NF3 as a measure of vesicle protection against this surfactant. J Biomater Sci Polym Ed 2002; 12:255-66. [PMID: 11403240 DOI: 10.1163/156856201750180960] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The capacity of glycoprotein (GP) excreted by Pseudoalteromonas antarctica NF3, to protect phosphatidylcholine (PC) liposomes against the action of the anionic surfactant sodium dodecyl sulfate (SDS) was studied in detail. To this end, changes in the surfactant partitioning between the lipid bilayer and the aqueous phase (partition coefficients, K) and in the effective surfactant to PC molar ratios (Re) were determined as a function of the amount of GP assembled with liposomes. The permeability of liposomes was determined by monitoring the changes in the fluorescence intensity of liposomes due to the release of the fluorescent dye 5(6)-carboxyfluorescein (CF) from the interior of vesicles to the bulk aqueous phase. Increasing GP amounts in the system resulted in the same interaction step as a rise in Re and a fall in the surfactant partitioning between the lipid bilayer and water. Hence, the higher the proportion of GP, the lower the surfactant ability to alter the permeability of liposomes and the lower its affinity with these bilayer structures. In addition, increasing GP proportions resulted in the same interaction step as a progressive increase of the free surfactant concentration (S(W)). The fact that the S(W) was always lower than the surfactant critical micelle concentration indicates that the interaction of SDS with coated liposomes was mainly ruled by the action of surfactant monomers in all cases.
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Affiliation(s)
- M Cócera
- Departamento de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona, Consejo Superior de Investigaciones Científicas, Spain
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Cócera M, López O, Estelrich J, Parra JL, de la Maza A. Use of a fluorescence spectroscopy technique to study the adsorption of sodium dodecylsulfonate on liposomes. Chem Phys Lipids 2001; 110:19-26. [PMID: 11245831 DOI: 10.1016/s0009-3084(00)00205-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: 11/23/2022]
Abstract
The fluorescent probe 2-(p-toluidinyl)-naphthalene-6-sodium sulfonate was used to study the surface adsorption of sublytic concentrations of the anionic surfactant sodium dodecylsulfonate (C(12)-SO(3)) on phosphatidylcholine bilayers. The number of adsorbed molecules was quantified by determination of the electrostatic potential (psi(0)) of the bilayers. The abrupt decrease in the fluorescence intensity already detected 10 s after the surfactant addition and the slight fluorescence variations with time indicated that the surfactant adsorption was very fast and almost complete. For a given number of monomers adsorbed, a linear dependence between the lipid and C(12)-SO(3) concentrations was obtained, indicating a similar adsorption mechanism regardless of the surfactant concentration. Hence, a monomeric adsorption is assumed even in systems with a C(12)-SO(3) concentration above its critical micellar concentration (CMC). In addition, this linear correlation allowed us to determine the surfactant/lipid molar ratios (Re) (inversely related to the C(12)-SO(3) ability to be adsorbed on liposomes) and the bilayer/aqueous phase coefficients (K). The fact that the lowest values for Re were always reached after 10 s of incubation corroborates the rapid kinetic of the process. The decrease in the C(12)-SO(3) partitioning (K) when the number of surfactant molecules exceeded 15000 was possibly due to the electrostatic repulsion between the free and the adsorbed monomers, which could hinder the incorporation of new monomers on the charged surface of liposomes.
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Affiliation(s)
- M Cócera
- Departamento de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona (I.I.Q.A.B.), Consejo Superior de Investigaciones Científicas (C.S.I.C.), C/ Jordi Girona 18-26, 08034, Barcelona, Spain
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López O, Cócera M, Walther P, Wehrli E, Coderch L, Parra JL, de la Maza A. Liposomes as protective agents of stratum corneum against octyl glucoside: a study based on high-resolution, low-temperature scanning electron microscopy. Micron 2001; 32:201-5. [PMID: 10936462 DOI: 10.1016/s0968-4328(99)00146-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ability of phosphatidylcholine (PC) liposomes to protect pig stratum corneum (SC) against the action of the nonionic surfactant octyl glucoside (OG) was investigated "in vitro" using double-layer coating for high-resolution, low-temperature scanning electron microscopy. This technique has been useful in preventing drying artifacts in the study of biological materials. The treatment of SC with OG led to a perturbation mainly in the corneocytes. However, the incubation of the tissue with liposomes prior to the OG treatment resulted in a progressive decrease in these perturbations and, consequently, in the progressive protection of the SC against the action of the surfactant.
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Affiliation(s)
- O López
- Departmento de Tensioactivos, Centro de Investigación y Desarrollo, Consejo Superior de Investigaciones Científicas C/ Jordi Girona, 18-26, 08034 Barcelona, Spain
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Cócera M, López O, Estelrich J, Parra JL, de la Maza A. Use of a fluorescence spectroscopy technique to study the adsorption of sodium dodecylsulfonate on liposomes. Chem Phys Lipids 2001; 109:29-36. [PMID: 11163342 DOI: 10.1016/s0009-3084(00)00212-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The fluorescent probe 2-(p-toluidinyl)-naphthalene-6-sodium sulfonate (TNS) was used to study the surface adsorption of sublytic concentrations of the anionic surfactant sodium dodecylsulfonate (C(12)-SO(3)) on phosphatidylcholine (PC) bilayers. The number of adsorbed molecules was quantified by determination of the electrostatic potential (psi(o)) of the bilayers. The abrupt decrease in the fluorescence intensity detected even 10 s after the surfactant addition and the slight fluorescence variations with time indicated that the surfactant adsorption was very fast and almost complete. For a given number of monomers adsorbed a linear dependence between the lipid and C12-SO3 concentrations was obtained, indicating similar adsorption mechanism regardless of the surfactant concentration. Hence, a monomeric adsorption is assumed even in systems with a C12-SO3 concentration above its CMC. In addition, this linear correlation allowed us to determine the surfactant/lipid molar ratios (Re) (inversely related to the C12-SO3 ability to be adsorbed on liposomes) and the bilayer/aqueous phase coefficients (K). The fact that the lowest values for Re were always reached after 10 s of incubation corroborates the rapid kinetics of the process. The decrease in the C12-SO3 partitioning (K) when the number of surfactant molecules exceeded 15000 was possibly due to the electrostatic repulsion between the free and the adsorbed monomers, which could hinder the incorporation of new monomers on the charged surface of liposomes.
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Affiliation(s)
- M Cócera
- Departamento de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona (I.I.Q.A.B.), Consejo Superior de Investigaciones Científicas (C.S.I.C.), C/Jordi Girona, 18-26, 08034 Barcelona, Spain
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López O, Cócera M, de la Maza A, Coderch L, Parra JL. Different stratum corneum lipid liposomes as models to evaluate the effect of the sodium dodecyl sulfate. Biochim Biophys Acta 2000; 1508:196-209. [PMID: 11090826 DOI: 10.1016/s0005-2736(00)00306-0] [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] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The stability of stratum corneum (SC) liposomes against the action of surfactants has been revised. To this end, two types of vesicles were used; vesicles formed with the lipid and protein material extracted from SC, and lipid mixtures approximating the SC composition. In this case, the proportion of ceramides (Cer) and cholesteryl sulfate (Chol-sulf) was varied and the relative proportion of the other lipids remained constant. The increasing presence of these two lipids increased the resistance of liposomes against the action of the anionic surfactant sodium dodecyl sulfate (SDS). The rise in the cell-to-cell cohesion that occurred in recessive X-linked ichthyosis due to the accumulation of Chol-sulf could be associated in part to the enhanced stability of (Chol-sulf)-enriched bilayers. It is noteworthy that the surfactant partitioning between bilayers and the aqueous phase increased and decreased, respectively, as the proportion of Cer and Chol-sulf increased. This effect may be attributed to the variations in both the electrostatic interactions lipid-surfactant (electrostatic repulsion between the sulfate groups of both Chol-sulf and SDS), and the hydrophilic lipophilic balance of the lipid mixtures, in which Cer is replaced by the major polar lipid of the mixture (Chol-sulf). The fact that the free surfactant concentration was always smaller than its critical micelle concentration indicates that the permeability alterations were mainly ruled by the action of surfactant monomers, in agreement with the results reported for sublytic interactions of this surfactant with PC liposomes.
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Affiliation(s)
- O López
- Departamento de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona, Consejo Superior de Investigaciones Científicas, Calle Jorge Girona 18-26, 08034, Barcelona, Spain
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Cócera M, López O, Parra JL, Mercadé ME, Guinea J, de la Maza A. Protective effect caused by the exopolymer excreted by Pseudoalteromonas antarctica NF(3) on liposomes against the action of octyl glucoside. Int J Pharm 2000; 207:39-47. [PMID: 11036228 DOI: 10.1016/s0378-5173(00)00525-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The capacity of the glycoprotein (GP) excreted by Pseudoalteromonas antarctica NF(3), to protect phosphatidylcholine (PC) liposomes against the action of octyl glucoside (OG) was studied in detail. Increasing amounts of GP assembled with liposomes resulted for the same interaction step in a linear increase in the effective surfactant to PC molar ratios (Re) and in a linear fall in the surfactant partitioning between bilayer and the aqueous phase (partition coefficients K). Thus, the higher the proportion of GP assembled with liposomes the lower the surfactant ability to alter the permeability of vesicles and the lower its affinity with these bilayer structures. In addition, increasing GP proportions resulted in a progressive increase of the free surfactant concentration (S(W)) needed to produce the same alterations in liposomes. The fact that S(W) was always lower than the surfactant critical micelle concentration indicates that the interaction was mainly ruled by the action of surfactant monomers, regardless of the amount of assembled GP.
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Affiliation(s)
- M Cócera
- Departamento de Tensioactivos, Centro de Investigación y Desarrollo (C.I.D.), Consejo Superior de Investigaciones Científicas (C.S.I.C. ),C/. Jorge Girona, 18-26, 08034, Barcelona, Spain
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Cócera M, López O, Coderch L, Parra JL, de la Maza A. Alterations in stratum corneum lipid liposomes due to the action of triton X-100. Influence of the level of ceramides on this process. J Control Release 2000; 68:387-96. [PMID: 10974392 DOI: 10.1016/s0168-3659(00)00279-0] [Citation(s) in RCA: 10] [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: 11/27/2022]
Abstract
The role played by the ceramides (Cer) in the interaction of Triton X-100 (T(X-100)) with liposomes modeling the stratum corneum (SC) lipid composition was studied. The surfactant/lipid molar ratios (Re) and the bilayer/aqueous phase partition coefficients (K) were determined at sublytic level by monitoring the changes in the fluorescence intensity of liposomes due to the 5(6)-carboxyfluorescein (CF) released from the interior of vesicles. Higher and lower Cer proportions than those existing in the SC (40%) led respectively to a fall and to a rise in the surfactant ability to alter these liposomes. However, the surfactant partitioning between bilayers and water (bilayer affinity with vesicles) exhibited a maximum for 40% Cer. Thus, at low Cer proportions the ability of T(X-100) molecules to alter these bilayers was maximum despite their reduced partitioning into bilayers, in line with the reported interaction of the anionic surfactant model sodium dodecyl sulfate with these vesicles. These findings underline the fragility of these bilayers as an effective barrier and could explain in part the reported dependencies of low level of Cer in skin lipids and function barrier abnormalities. The fact that the free surfactant concentration needed to achieve the two interaction levels investigated was lower than the surfactant CMC indicates that permeability alterations were mainly ruled by the action of surfactant monomers, regardless of Cer proportion in bilayers.
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Affiliation(s)
- M Cócera
- Departamento de Tecnologías de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona (I.I.Q.A.B.), Consejo Superior de Investigaciones Científicas (C.S.I.C.) Calle Jorge Girona 18-26, 08034, Barcelona, Spain
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