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López-Antoñanzas L, Jaimes León E, Ruano-Campos A, Garcí-Galocha JL, Del Campo M, Flores Flores C, Peña Soria MJ, García AJ. P-107 DOES BARBED SUTURE REDUCE THE RATE OF EVISCERATIONS IN EMERGENCY MIDLINE LAPAROTOMIES? Br J Surg 2022. [DOI: 10.1093/bjs/znac308.205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
Introduction
Evisceration is a frequent consequence after performing midline laparotomies (ML) in urgent abdominal surgeries. The aim of this study was to compare and evaluate the results obtained after the introduction of barbed sutures in abdominal wall closure.
Materials and methods
We performed a retrospective analysis of patients undergoing emergency surgery in our hospital following a midline laparotomy approach in the last 5 years. Preoperative variables were compared between both groups and related to early surgical wound complications, depending on the type of abdominal wall closure performed.
Results
222 patients underwent surgery (Polydioxanone (P); 128; Barbed (B); 94) after ruling out exclusion factors such as neuromuscular disease, recent abdominal surgeries and whose follow-up had been lost. There were no significant differences between the two groups in terms of preoperative baseline characteristics or associated comorbidities. Furthermore, there were no statistically significant differences in type of surgery performed; the most frequent was small bowel obstruction. After data analysis, no differences were found in terms of hospital stay (P; 7.43 days vs B; 6.05 days, p=0.421) or mortality (P; 3.125% vs B; 4.25, p=0.655). Concerning immediate complications, there were no differences regarding surgical wound infection (P; 18.75% vs B; 10.63%, p=0.061) and seroma (P; 3.125% vs B; 2.12, p=0.651). Evisceration rates turned out to be more frequent in the polydioxanone group (P; 20.31% vs B; 8.51%, p=0.016).
Conclusions
The use of barbed sutures reduced the incidence of evisceration, therefore it can be considered as recommended sutures for aponeurotic closure in emergent ML.
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Affiliation(s)
| | - E Jaimes León
- General Surgery, Hospital Clinico San Carlos , Madrid , Spain
| | - A Ruano-Campos
- General Surgery, Hospital Clinico San Carlos , Madrid , Spain
| | | | - M Del Campo
- General Surgery, Hospital Clinico San Carlos , Madrid , Spain
| | - C Flores Flores
- General Surgery, Hospital Clinico San Carlos , Madrid , Spain
| | - M J Peña Soria
- General Surgery, Hospital Clinico San Carlos , Madrid , Spain
| | - A J García
- General Surgery, Hospital Clinico San Carlos , Madrid , Spain
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2
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Pérez-Barbería FJ, García AJ, Brewer MJ, Cappelli J, Serrano MP, Gallego L, Landete-Castillejos T. Effects of maternal age and offspring sex on milk yield, composition and calf growth of red deer (Cervus elaphus). Sci Rep 2022; 12:14506. [PMID: 36008507 PMCID: PMC9411626 DOI: 10.1038/s41598-022-17978-3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 08/03/2022] [Indexed: 11/14/2022] Open
Abstract
Differential maternal allocation theory states that mothers will invest more heavily in the offspring sex that will secure higher reproductive output. Senescence theory is concerned with the gradual deterioration of physiological function with age. We analysed the offspring sex-dependent response of calf growth and milk traits to mother age in an Iberian population of captive red deer (Cervus elaphus) using a 22 year time series longitudinal data set. Previous studies revealed that there was little evidence for the differential allocation theory on milk traits and that most studies lacked proper control for confounding factors. Our results indicated that (i) calf growth was offspring male-biased, negatively affected by mother age and positively influenced by mother weight and parity, and (ii) there was no support for differential allocation offspring sex-dependence in milk traits (yield, energy density, fat, protein and lactose content). Our findings suggest that maternal allocation responds to offspring energy requirements, which are mainly driven by offspring body weight, and contingent on mother age and weight and previous maternal reproductive effort.
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Affiliation(s)
- F J Pérez-Barbería
- Department of Agroforestry Science and Technology and Genetics, Institute of Regional Development, Game and Livestock Resources Unit, University of Castilla-La Mancha, IREC, 02071, Albacete, Spain. .,Biodiversity Research Institute (Oviedo University, CSIC, Principality of Asturias), Mieres Campus, 33600, Mieres, Spain.
| | - A J García
- Department of Agroforestry Science and Technology and Genetics, Institute of Regional Development, Game and Livestock Resources Unit, University of Castilla-La Mancha, IREC, 02071, Albacete, Spain
| | - M J Brewer
- Biomathematics and Statistics Scotland (BioSS), Craigiebuckler, Aberdeen, AB15 8QH, Scotland, UK
| | - J Cappelli
- Department of Agroforestry Science and Technology and Genetics, Institute of Regional Development, Game and Livestock Resources Unit, University of Castilla-La Mancha, IREC, 02071, Albacete, Spain
| | - M P Serrano
- Departamento de Producción Agraria, Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, Polytechnic University of Madrid, 28054, Madrid, Spain
| | - L Gallego
- Department of Agroforestry Science and Technology and Genetics, Institute of Regional Development, Game and Livestock Resources Unit, University of Castilla-La Mancha, IREC, 02071, Albacete, Spain
| | - T Landete-Castillejos
- Department of Agroforestry Science and Technology and Genetics, Institute of Regional Development, Game and Livestock Resources Unit, University of Castilla-La Mancha, IREC, 02071, Albacete, Spain
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3
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Lozoya Araque T, Monfort Ortiz IR, Martín González JE, Jiménez García A, Navarro Hidalgo I, Andrade Gamarra V, Parrell Soler C, Gil Raga F. Ovarian Stromal Hyperplasia: A Rare Cause of Postmenopausal Hyperandrogenism. J Menopausal Med 2020; 26:39-43. [PMID: 32307950 PMCID: PMC7160587 DOI: 10.6118/jmm.19012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 02/17/2020] [Accepted: 03/22/2020] [Indexed: 12/26/2022] Open
Abstract
Ovarian hyperthecosis and ovarian stromal hyperplasia (OSH) are two uncommon non-neoplastic causes of ovarian hyperandrogenism, whose etiology is still unknown. These conditions are characterized by obesity, hyperinsulinemia, acanthosis nigricans, and even virilization, mainly in postmenopausal women. Here we have reported the case of a 67-year-old patient with a diagnosis of OSH, which was resolved after bilateral laparoscopic oophorectomy. In this case report, we have discussed two different conditions posing a diagnostic challenge and requiring a high index of suspicion.
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Affiliation(s)
| | | | | | | | | | | | | | - Fernando Gil Raga
- Department of Obstetrics and Gynecology, Manises Hospital, Valencia, Spain
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4
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Landete-Castillejos T, Kierdorf H, Gomez S, Luna S, García AJ, Cappelli J, Pérez-Serrano M, Pérez-Barbería J, Gallego L, Kierdorf U. Antlers - Evolution, development, structure, composition, and biomechanics of an outstanding type of bone. Bone 2019; 128:115046. [PMID: 31446115 DOI: 10.1016/j.bone.2019.115046] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 08/20/2019] [Accepted: 08/21/2019] [Indexed: 02/07/2023]
Abstract
Antlers are bony appendages of deer that undergo periodic regeneration from the top of permanent outgrowths (the pedicles) of the frontal bones. Of the "less familiar" bone types whose study was advocated by John Currey to gain a better understanding of structure-function relationships of mineralized tissues and organs, antlers were of special interest to him. The present review summarizes our current knowledge about the evolution, development, structure, mineralization, and biomechanics of antlers and how their formation is affected by environmental factors like nutrition. Furthermore, the potential role of antlers as a model in bone biology and several fields of biomedicine as well as their use as a monitoring tool in environmental studies are discussed.
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Affiliation(s)
- T Landete-Castillejos
- Instituto de Investigación en Recursos Cinegéticos, Universidad de Castilla-La Mancha, 02071 Albacete, Spain; Escuela Técnica Superior de Ingenieros Agrónomos y Montes, Universidad de Castilla-La Mancha, 02071 Albacete, Spain; Sección de Recursos Cinegéticos y Ganaderos, Instituto de Desarrollo Regional, Universidad de Castilla-La Mancha, 02071 Albacete, Spain.
| | - H Kierdorf
- Department of Biology, University of Hildesheim, 31141 Hildesheim, Germany
| | - S Gomez
- Universidad de Cádiz, 11071 Cádiz, Spain
| | - S Luna
- Universidad de Cádiz, 11071 Cádiz, Spain
| | - A J García
- Instituto de Investigación en Recursos Cinegéticos, Universidad de Castilla-La Mancha, 02071 Albacete, Spain; Escuela Técnica Superior de Ingenieros Agrónomos y Montes, Universidad de Castilla-La Mancha, 02071 Albacete, Spain; Sección de Recursos Cinegéticos y Ganaderos, Instituto de Desarrollo Regional, Universidad de Castilla-La Mancha, 02071 Albacete, Spain
| | - J Cappelli
- Instituto de Investigación en Recursos Cinegéticos, Universidad de Castilla-La Mancha, 02071 Albacete, Spain; Escuela Técnica Superior de Ingenieros Agrónomos y Montes, Universidad de Castilla-La Mancha, 02071 Albacete, Spain; Sección de Recursos Cinegéticos y Ganaderos, Instituto de Desarrollo Regional, Universidad de Castilla-La Mancha, 02071 Albacete, Spain
| | - M Pérez-Serrano
- Instituto de Investigación en Recursos Cinegéticos, Universidad de Castilla-La Mancha, 02071 Albacete, Spain; Escuela Técnica Superior de Ingenieros Agrónomos y Montes, Universidad de Castilla-La Mancha, 02071 Albacete, Spain; Sección de Recursos Cinegéticos y Ganaderos, Instituto de Desarrollo Regional, Universidad de Castilla-La Mancha, 02071 Albacete, Spain
| | - J Pérez-Barbería
- Instituto de Investigación en Recursos Cinegéticos, Universidad de Castilla-La Mancha, 02071 Albacete, Spain; Escuela Técnica Superior de Ingenieros Agrónomos y Montes, Universidad de Castilla-La Mancha, 02071 Albacete, Spain; Sección de Recursos Cinegéticos y Ganaderos, Instituto de Desarrollo Regional, Universidad de Castilla-La Mancha, 02071 Albacete, Spain
| | - L Gallego
- Instituto de Investigación en Recursos Cinegéticos, Universidad de Castilla-La Mancha, 02071 Albacete, Spain; Escuela Técnica Superior de Ingenieros Agrónomos y Montes, Universidad de Castilla-La Mancha, 02071 Albacete, Spain; Sección de Recursos Cinegéticos y Ganaderos, Instituto de Desarrollo Regional, Universidad de Castilla-La Mancha, 02071 Albacete, Spain
| | - U Kierdorf
- Department of Biology, University of Hildesheim, 31141 Hildesheim, Germany
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5
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Miroshnikova YA, Rozenberg GI, Cassereau L, Pickup M, Mouw JK, Ou G, Templeman KL, Hannachi EI, Gooch KJ, Sarang-Sieminski AL, García AJ, Weaver VM. α5β1-Integrin promotes tension-dependent mammary epithelial cell invasion by engaging the fibronectin synergy site. Mol Biol Cell 2017; 28:2958-2977. [PMID: 28877984 PMCID: PMC5662256 DOI: 10.1091/mbc.e17-02-0126] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 08/25/2017] [Accepted: 08/29/2017] [Indexed: 12/13/2022] Open
Abstract
Fibronectin-ligated α5β1 integrin promotes malignancy by inducing tissue tension. Tumors are fibrotic and characterized by abundant, remodeled, and cross-linked collagen that stiffens the extracellular matrix stroma. The stiffened collagenous stroma fosters malignant transformation of the tissue by increasing tumor cell tension to promote focal adhesion formation and potentiate growth factor receptor signaling through kinase. Importantly, collagen cross-linking requires fibronectin (FN). Fibrotic tumors contain abundant FN, and tumor cells frequently up-regulate the FN receptor α5β1 integrin. Using transgenic and xenograft models and tunable two- and three-dimensional substrates, we show that FN-bound α5β1 integrin promotes tension-dependent malignant transformation through engagement of the synergy site that enhances integrin adhesion force. We determined that ligation of the synergy site of FN permits tumor cells to engage a zyxin-stabilized, vinculin-linked scaffold that facilitates nucleation of phosphatidylinositol (3,4,5)-triphosphate at the plasma membrane to enhance phosphoinositide 3-kinase (PI3K)-dependent tumor cell invasion. The data explain why rigid collagen fibrils potentiate PI3K activation to promote malignancy and offer a perspective regarding the consistent up-regulation of α5β1 integrin and FN in many tumors and their correlation with cancer aggression.
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Affiliation(s)
- Y A Miroshnikova
- Department of Surgery, Center for Bioengineering and Tissue Regeneration, University of California, San Francisco, San Francisco, CA 94143
| | - G I Rozenberg
- Institute for Medicine and Engineering, University of Pennsylvania, Philadelphia, PA 19104
| | - L Cassereau
- Department of Surgery, Center for Bioengineering and Tissue Regeneration, University of California, San Francisco, San Francisco, CA 94143
| | - M Pickup
- Department of Surgery, Center for Bioengineering and Tissue Regeneration, University of California, San Francisco, San Francisco, CA 94143
| | - J K Mouw
- Department of Surgery, Center for Bioengineering and Tissue Regeneration, University of California, San Francisco, San Francisco, CA 94143
| | - G Ou
- Department of Surgery, Center for Bioengineering and Tissue Regeneration, University of California, San Francisco, San Francisco, CA 94143
| | - K L Templeman
- Woodruff School of Mechanical Engineering, Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA 30332
| | - E-I Hannachi
- Woodruff School of Mechanical Engineering, Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA 30332
| | - K J Gooch
- Institute for Medicine and Engineering, University of Pennsylvania, Philadelphia, PA 19104
| | - A L Sarang-Sieminski
- Institute for Medicine and Engineering, University of Pennsylvania, Philadelphia, PA 19104
| | - A J García
- Woodruff School of Mechanical Engineering, Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA 30332
| | - V M Weaver
- Department of Surgery, Center for Bioengineering and Tissue Regeneration, University of California, San Francisco, San Francisco, CA 94143 .,Department of Anatomy and Department of Bioengineering and Therapeutic Sciences, Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research and Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA 94143
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6
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Ceacero F, Landete-Castillejos T, Bartošová J, García AJ, Bartoš L, Komárková M, Gallego L. Habituating to handling: factors affecting preorbital gland opening in red deer calves. J Anim Sci 2014; 92:4130-6. [PMID: 25035243 DOI: 10.2527/jas.2014-7716] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The preorbital gland plays not only an olfactory role in cervids but also a visual one. Opening this gland is an easy way for the calf to communicate with the mother, indicating hunger/satiety, stress, pain, fear, or excitement. This information can be also useful for farm operators to assess how fast the calves habituate to handling routines and to detect those calves that do not habituate and may suffer chronic stress in the future. Thirty-one calves were subjected to 2 consecutive experiments to clarify if observing preorbital gland opening is related to habituation to handling in red deer calves (Cervus elaphus). Calves were born in 3 different paddocks, handled as newborns (Exp. 1), and then subjected to the same routine handling but with different periodicity: every 1, 2, or 3 wk (Exp. 2). In Exp. 1, preorbital gland opening was recorded in newborns during an initial handling (including weighing, ear tagging, and sex determination). Preorbital gland opening occurred in 93% of calves during this procedure and was not affected by sex, time since birth, or birth weight. Experiment 2 consisted of measuring preorbital opening during the same routine handling (weighing, blood sampling, and rump touching to assess body condition) when calves were 1, 3, and 5 mo old. Binary logistic regression showed that gland opening was associated with habituation to handling, since at 1 and 3 mo the probability of opening the gland decreased with the number of handlings that a calf experienced before (P = 0.008 and P = 0.028, respectively). However, there were no further changes in preorbital gland opening rate in the 5-mo-old calves (P = 0.182). The significant influence of the number of previous handlings on the probability of opening the preorbital gland was confirmed through generalized linear model with repeated measures (P = 0.007). Preorbital gland opening decreased along the phases of the study. Nevertheless, we found a significant trend in individuals to keep similar opening patterns (intraclass correlation coefficient = 0.807, P < 0.001), which suggests that the more stressed individuals can be detected with this method. Therefore, we conclude that preorbital gland opening during routine handlings is related to the number of previous handlings, and thus it can be used as an indicator of lack of habituation to handling in farmed cervids.
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Affiliation(s)
- F Ceacero
- Department of Ethology, Institute of Animal Science, Praha 10-Uhříněves, Czech Republic Department of Animal Science and Food Processing, Faculty of Tropical AgriSciences, Czech University of Life Sciences. Prague 6-Suchdol, Czech Republic
| | - T Landete-Castillejos
- Departamento de Ciencia y Tecnología Agroforestal y Genética, ETSIA, Universidad de Castilla-La Mancha. Albacete, Spain Sección de Recursos Cinegéticos, IDR, Universidad de Castilla-La Mancha. Albacete, Spain Animal Science Techniques Applied to Wildlife Management Research Group, IREC Sec. Albacete. Albacete, Spain
| | - J Bartošová
- Department of Ethology, Institute of Animal Science, Praha 10-Uhříněves, Czech Republic
| | - A J García
- Departamento de Ciencia y Tecnología Agroforestal y Genética, ETSIA, Universidad de Castilla-La Mancha. Albacete, Spain Sección de Recursos Cinegéticos, IDR, Universidad de Castilla-La Mancha. Albacete, Spain Animal Science Techniques Applied to Wildlife Management Research Group, IREC Sec. Albacete. Albacete, Spain
| | - L Bartoš
- Department of Ethology, Institute of Animal Science, Praha 10-Uhříněves, Czech Republic
| | - M Komárková
- Department of Ethology, Institute of Animal Science, Praha 10-Uhříněves, Czech Republic
| | - L Gallego
- Departamento de Ciencia y Tecnología Agroforestal y Genética, ETSIA, Universidad de Castilla-La Mancha. Albacete, Spain
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7
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Chan-Chan LH, Vargas-Coronado RF, Cervantes-Uc JM, Cauich-Rodríguez JV, Rath R, Phelps EA, García AJ, San Román Del Barrio J, Parra J, Merhi Y, Tabrizian M. Platelet adhesion and human umbilical vein endothelial cell cytocompatibility of biodegradable segmented polyurethanes prepared with 4,4'-methylene bis(cyclohexyl isocyanate), poly(caprolactone) diol and butanediol or dithioerythritol as chain extenders. J Biomater Appl 2012; 28:270-7. [PMID: 22684514 DOI: 10.1177/0885328212448259] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Biodegradable segmented polyurethanes were prepared with poly(caprolactone) diol as a soft segment, 4,4'-methylene bis(cyclohexyl isocyanate) (HMDI) and either butanediol or dithioerythritol as chain extenders. Platelet adhesion was similar in all segmented polyurethanes studied and not different from Tecoflex® although an early stage of activation was observed on biodegradable segmented polyurethane prepared with dithioerythritol. Relative viability was higher than 80% on human umbilical vein endothelial cells in contact with biodegradable segmented polyurethane extracts after 1, 2 and 7 days. Furthermore, both biodegradable segmented polyurethane materials supported human umbilical vein endothelial cell adhesion, spreading, and viability similar to Tecoflex® medical-grade polyurethane. These biodegradable segmented polyurethanes represent promising materials for cardiovascular applications.
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Affiliation(s)
- L H Chan-Chan
- Centro de Investigación Científica de Yucatán, A.C., Calle 43 # 130 Col. Chuburná de Hidalgo, Mérida, Yucatán, México
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8
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Landete-Castillejos T, Currey JD, Ceacero F, García AJ, Gallego L, Gomez S. Does nutrition affect bone porosity and mineral tissue distribution in deer antlers? The relationship between histology, mechanical properties and mineral composition. Bone 2012; 50:245-54. [PMID: 22071000 DOI: 10.1016/j.bone.2011.10.026] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2011] [Revised: 10/21/2011] [Accepted: 10/26/2011] [Indexed: 11/28/2022]
Abstract
It is well known that porosity has an inverse relationship with the mechanical properties of bones. We examined cortical and trabecular porosity of antlers, and mineral composition, thickness and mechanical properties in the cortical wall. Samples belonged to two deer populations: a captive population of an experimental farm having a high quality diet, and a free-ranging population feeding on plants of lower nutritive quality. As shown for minerals and mechanical properties in previous studies by our group, cortical and trabecular porosity increased from the base distally. Cortical porosity was always caused by the presence of incomplete primary osteons. Porosity increased along the length of the antler much more in deer with lower quality diet. Despite cortical porosity being inversely related to mechanical properties and positively with K, Zn and other minerals indicating physiological effort, it was these minerals and not porosity that statistically better explained variability in mechanical properties. Histochemistry showed that the reason for this is that Zn is located around incomplete osteons and also in complete osteons that were still mineralizing, whereas K is located in non-osteonal bone, which constitutes a greater proportion of bone where osteons are incompletely mineralized. This suggests that, K, Zn and other minerals indicate reduction in mechanical performance even with little porosity. If a similar process occurred in internal bones, K, Zn and other minerals in the bone may be an early indicator of decrease in mechanical properties and future osteoporosis. In conclusion, porosity is related to diet and physiological effort in deer.
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Affiliation(s)
- T Landete-Castillejos
- Animal Science Tech. Applied to Wildlife Management Res. Group, IREC Sec. Albacete, IREC (CSIC-UCLM-JCCM), Campus UCLM, 02071 Albacete, Spain.
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9
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Esteban MB, García AJ, Ramos P, Márquez MC. Sub-critical water hydrolysis of hog hair for amino acid production. Bioresour Technol 2010; 101:2472-2476. [PMID: 20015642 DOI: 10.1016/j.biortech.2009.11.054] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2009] [Revised: 11/09/2009] [Accepted: 11/11/2009] [Indexed: 05/28/2023]
Abstract
A recycling method using sub-critical water hydrolysis to convert hog hair from slaughterhouses into amino acids was developed. The influence of the reaction parameters such as temperature, time of reaction and initial substrate concentration were investigated in a batch reactor. The quality and quantity of amino acids in hydrolysates were determined and 17 kinds of amino acids were obtained. Under the tested conditions, the highest amino acid yield (325 mg/g protein) was reached at an initial substrate concentration of 10 g/l, a temperature of 250 degrees C and a reaction time of 60 min. A large amount of low-molecular weight amino acids, such alanine and glycine, was observed at these operating conditions. Sub-critical water hydrolysis was confirmed as an effective and practical process to recover amino acids from hog hair waste.
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Affiliation(s)
- M B Esteban
- Department of Chemical Engineering, University of Salamanca, Faculty of Chemistry, Salamanca, Spain
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10
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Gaspar-López E, Landete-Castillejos T, Estevez JA, Ceacero F, Gallego L, García AJ. Biometrics, Testosterone, Cortisol and Antler Growth Cycle in Iberian Red Deer Stags (Cervus elaphus hispanicus). Reprod Domest Anim 2010; 45:243-9. [DOI: 10.1111/j.1439-0531.2008.01271.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [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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11
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Petrie TA, Reyes CD, Raynor JE, Burns KL, Collard DM, García AJ. Biointerfaces promoting tissue healing. J Musculoskelet Neuronal Interact 2007; 7:332. [PMID: 18094498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Affiliation(s)
- T A Petrie
- Petit Institute for Bioengineering and Bioscience, Georgia Inst. Technology, Atlanta, GA 30332-0363, USA
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12
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Esteban MB, García AJ, Ramos P, Márquez MC. Evaluation of fruit-vegetable and fish wastes as alternative feedstuffs in pig diets. Waste Manag 2007; 27:193-200. [PMID: 16510272 DOI: 10.1016/j.wasman.2006.01.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2005] [Revised: 07/29/2005] [Accepted: 01/06/2006] [Indexed: 05/06/2023]
Abstract
Fruit-vegetable and fish wastes were evaluated as potential feedstuffs for growing-finishing pigs. Wastes were collected from shops in the city of Salamanca (Spain) and their nutritional composition, mineral content and digestibility were determined. The dry matter of the wastes under study was relatively low (12% for fruit-vegetable waste and 26% for fish waste), but they presented all of the nutrient requirements for swine diets. The fish waste contained 58% crude protein, 22% ash, 19% ether extract and 1% crude fibre, whereas the fruit-vegetable waste contained 65% nitrogen free extract, 13% crude fibre, 12% crude protein, 8% ash and 2% ether extract. Waste digestibility decreased with temperature, and hence temperatures over 65 degrees C for fruit-vegetable waste and 105 degrees C for fish waste should not be used in the treatment to reduce the moisture and to ensure the microbiology quality. Therefore, two diets were formulated using linear programming. The analysed waste was included in approximately 20% of one of the diets, while another diet was formulated without any type of waste. These data showed that this part of biodegradable municipal waste could be managed as alternative feedstuffs in swine diets, reducing the amount of biodegradable municipal waste going to landfills.
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Affiliation(s)
- M B Esteban
- Department of Chemical Engineering and Textile Engineering, University of Salamanca, Faculty of Chemistry, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
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Garde JJ, Martínez-Pastor F, Gomendio M, Malo AF, Soler AJ, Fernández-Santos MR, Esteso MC, García AJ, Anel L, Roldán ERS. The Application of Reproductive Technologies to Natural Populations of Red Deer. Reprod Domest Anim 2006; 41 Suppl 2:93-102. [PMID: 16984473 DOI: 10.1111/j.1439-0531.2006.00773.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [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: 11/28/2022]
Abstract
Over the past decade, there has been increasing interest in the application of reproductive technology to the conservation and management of natural populations of deer. The application of assisted reproduction technologies within natural population of deer is in its infancy. However, its future potential is enormous, particularly in relation to genetic management or conservation. This paper reviews the present state of such technologies for a wild subspecies of red deer, the Iberian red deer (Cervus elaphus hispanicus), by discussing the major components of oestrous synchronization, semen collection/cryopreservation and insemination techniques. In addition, findings made during the course of studies on natural populations have enormous potential for the understanding of novel reproductive mechanism that may not be uncovered by livestock or human studies. A summary of these results are also reviewed here.
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Affiliation(s)
- J J Garde
- Reproductive Biology Group, Instituto de Investigación en Recursos Cinegéticos, IREC (UCLM-CSIC-JCCM), Campus Universitario, Albacete, Spain.
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14
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Abstract
Ex vivo gene therapy is a promising approach to orthopedic regenerative medicine. These strategies typically focus on the constitutive overexpression of osteogenic factors to induce osteoblastic differentiation and matrix mineralization. However, the unregulated production of osteoinductive molecules has also resulted in abnormal bone formation and tumorigenesis. To address these limitations, this work describes a retroviral system to deliver the Runx2 osteoblastic transcription factor under control of the tetracycline-inducible (tet-off) promoter in primary skeletal myoblasts. Runx2 expression was tightly regulated by anhydrotetracyline (aTc) concentration in cell culture media. Osteoblastic gene expression, alkaline phosphatase activity, and matrix mineralization were also controlled by aTc in a dose-dependent manner. Additionally, osteoblastic differentiation was temporally regulated by adding and removing aTc from the culture media. Engineered cells were seeded onto collagen scaffolds and implanted intramuscularly in the hind limbs of syngeneic mice. In vivo mineralization by these constructs was regulated by supplementing the drinking water with aTc, as demonstrated by micro-computed tomography and histological analyses. Collectively, these results present a novel system for regulating osteoblastic differentiation of a clinically relevant autologous cell source. This system is significant to developing controlled and effective orthopedic gene therapy strategies and studying the regulation of osteoblastic differentiation.
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Affiliation(s)
- C A Gersbach
- Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, 315 Ferst Drive, Atlanta, GA 30332, USA
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15
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Abstract
Binding of integrin adhesion receptors to extracellular matrix components, such as fibronectin and type I collagen, activates signaling pathways directing osteoblast survival, cell-cycle progression, gene expression, and matrix mineralization. Biomimetic strategies exploit these adhesive interactions to engineer bio-inspired surfaces that promote osteoblast adhesion and differentiation, bone formation, and osseointegration. These emerging initiatives focus on directing integrin binding through presentation of bio-adhesive motifs derived from extracellular matrices. These biomolecular approaches provide promising strategies for the development of biologically active implants and grafting substrates for enhanced bone repair.
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Affiliation(s)
- A J García
- Woodruff School of Mechanical Engineering, Petit Institute for Bioengineering and Bioscience, 315 Ferst Drive, 2314 Petit Biotechnology Building, Atlanta, GA 30332-0363, USA.
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16
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Abstract
Chondrocytes undergo a process of dedifferentiation in monolayer culture that is characterized by a transition to a fibroblast-like phenotype. This behavioral change poses a challenge for tissue-engineered cartilage constructs, as approaches using autologous cells require expansion in vitro. Because chondrocytes express a variety of integrin receptors specific to different adhesive proteins, we hypothesized that chondrocytes expanded on various underlying protein monolayers would have different phenotypic responses. Bovine articular chondrocytes were cultured for up to 2 weeks on tissue culture plastic, fibronectin, collagen type I or collagen type II substrate in the presence or absence of ascorbate. Contrary to our hypothesis, the extracellular matrix protein substrates used in this study did not significantly alter the changes in chondrocyte morphology, gene expression, matrix formation, or cytoskeletal organization. Cells on all substrates assembled equivalent matrices, which may have subsequently regulated cell behavior. In cultures with ascorbate, populations of round and spread cells emerged after 1 week, with round cells expressing collagen type II and the differentiated phenotype and spread cells dedifferentiating. In cultures without ascorbate, chondrocytes rapidly adhered and spread onto organized fibronectin matrices via the alpha5beta1 integrin, which has been associated with survival and proliferation of chondrocytes in vitro. These findings indicate that expanding chondrocytes on protein monolayers may not be an effective solution to preventing dedifferentiation and improving autologous chondrocyte transplantation.
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Affiliation(s)
- K R Brodkin
- George W Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, 30332-0405, USA
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17
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García AJ, Esteban MB, Márquez MC, Ramos P. Biodegradable municipal solid waste: characterization and potential use as animal feedstuffs. Waste Manag 2005; 25:780-7. [PMID: 16125059 DOI: 10.1016/j.wasman.2005.01.006] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2003] [Revised: 11/09/2004] [Accepted: 01/11/2005] [Indexed: 05/04/2023]
Abstract
Five different fractions of the biodegradable municipal solid waste (BMSW) were evaluated as potential animal feedstuffs. For each source of waste (meat waste (MW), fish waste (FW), fruit and vegetables waste (FVW), restaurant waste (RW), household waste (HW)), samples were obtained from small shops (butchers, fishmongers, fruit and vegetable shops), restaurants and a MSW treatment plant (household waste). The chemical composition, microbiological characterization, dioxins, furans, PCB's and mineral content were determined for every type of waste fraction. The analysed biodegradable waste presented high moisture content (from 60% to 90%). Some fractions were dense in one nutrient: meat waste in ether extract, fish waste in crude protein, fruit and vegetable waste in nitrogen free extract. The other studied fractions (restaurant fraction and household fraction) presented a more balanced composition, but the presence of toxic concentrations of contaminants such as metals was higher than European legislation permitted values in animal feeding. From a microbiological standpoint, a heat treatment at 65 degrees C for 20 min was sufficient to ensure microbiological quality of the samples. This treatment was also advisable to reduce the moisture content: a lower moisture content facilitates the waste handling and processing and, therefore, the inclusion of these waste fractions in commercial animal diets. This paper presents a potential alternative for the recovery of organic matter content in municipal solid waste. The results obtained in this research and the feedstuffs legislation in force related to animal feed, indicated that some of the studied biodegradable waste fractions (meat waste, fruit and vegetable waste and fish waste) could be considered as alternatives to typical raw materials used in animal feeds.
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Affiliation(s)
- A J García
- Department of Chemical Engineering, University of Salamanca, Spain
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18
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García AJ, Angulo E, Blackall PJ, Ortiz AM. The presence of nicotinamide adenine dinucleotide-independent Haemophilus paragallinarum in México. Avian Dis 2004; 48:425-9. [PMID: 15283432 DOI: 10.1637/7104] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Two isolates of Haemophilus paragallinarum were obtained from a layer chicken in Mexico. The isolates were confirmed as H. paragallinarum by polymerase chain reaction and conventional biochemical identification. The isolates were nicotinamide adenine dinucleotide (NAD) independent-growing on blood agar without the need of a nurse colony as well as on a complex medium that lacked both NAD and chicken serum. Both isolates were pathogenic, causing the typical clinical signs of infectious coryza in susceptible chickens. One isolate was Page serovar B/Kume serovar B-1 and the other isolate was Page serovar C/Kume serovar C-2. The isolates were associated with a field outbreak that involved an egg drop of 20% over a 3-wk period and a doubling of weekly mortality (from 0.1% to 0.2%). This is the first report of NAD-independent H. paragallinarum outside South Africa and is the first time that NAD-independent H. paragallinarum of serovar B has been reported.
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Affiliation(s)
- A J García
- Laboratorios Avilab, Porcicultores 80 Tepatitlan, Jalisco, CP 47600, Mexico
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19
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García AJ, Martos F, Leiva F, Sánchez de la Cuesta F. [Generic drugs: good or bad? Physician's knowledge of generic drugs and prescribing habits]. Gac Sanit 2003; 17:144-9. [PMID: 12729542 DOI: 10.1016/s0213-9111(03)71712-9] [Citation(s) in RCA: 13] [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] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
In this article we analyze the responses of 1220 Spanish physicians who participated in a survery about generic drugs. A previously validated questionnaire was sent to physicians through the Spanish Medical Councils of the different provinces. Four items were analyzed: what doctors know about generic drugs (knowledge); physicians' prescribing habits concerning these drugs (attitude and professional competence); how prescription of generic drugs effects pharmaceutical costs amd, finally, what doctors believe a generic drug should be. The influence of physician-related variables (age, type of contract, specialty, workload, etc.) on prescribing of generic drugs was also analyzed. In view of the results, we believe that to rationalize expenditure through and appropriate policy on generic drugs Spanish health authorities should offer more and better training and information (clear and independent) about what generic drugs are.
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Affiliation(s)
- A J García
- Departamento de Farmacología y Terapéutica Clínica. Universidad de Málaga. España.
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20
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Abstract
This study characterized the seasonal pattern of luteal cyclicity in Iberian red deer (n=16), by measuring plasma progesterone concentrations in hinds (female red deer) twice per week from calving (May and June) 1996 until May 1997. In eight of these hinds we also examined plasma prolactin profiles to assess seasonal responses to photoperiod. Plasma progesterone concentration in the 16 hinds studied indicated that the reproductive pattern is seasonal, and lasts for 5.73 +/- 0.27 months. After calving, progesterone levels remained basal (no luteal activity) for several months, except in a hind that lost her calf just after calving, and thus did not have to suckle it. This hind showed two consecutive estrus cycles in the month following calving, which suggests that suckling has an inhibiting effect on the resumption of ovarian activity. These results also showed that as long as the hinds do not become pregnant, they show between 5 and 10 estrus cycles per reproductive season (8.06 +/- 0.35), ranging between 105 and 249 days from onset of the first cycle to end of the last one. Uninterrupted cycling lasted for 3.5-6.4 months (mean, 4.6 +/- 0.24). Cyclic luteal activity was found from October to February in all hinds, with a smaller, but notable proportion in September (56.25%) and March (68.8%), whereas it was negligible in the remaining period. Our results show a reproductive season similar to or longer than that recorded by other authors. Prolactin plasma concentrations showed a yearly trend following that of photoperiod, with peak concentrations from April to July, a decrease in August, minimal concentrations from September to February and a sharp increase in March.
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Affiliation(s)
- A J García
- Departamento de Ciencia y Tecnología Agroforestal, ETSIA, Albacete, Spain.
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21
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Abstract
Integrin receptors mediate cell adhesion to extracellular matrices and provide signals that direct proliferation and differentiation. Integrin binding involves receptor-ligand interactions at the cell-substrate interface and assembly and reorganization of structural and signaling elements at the cytoplasmic face. Using a cross-linking/extraction/reversal method to quantify bound integrins, we demonstrate that the density of alpha5beta1 integrin-fibronectin bonds increases linearly with ligand density, as predicted by simple receptor-ligand equilibrium. This linear relationship is consistent with linear increases in cell adhesion strength with receptor and ligand surface densities. Furthermore, we show that phosphorylation of FAK, a tyrosine kinase involved in early integrin-mediated signaling, increases linearly with the number of integrin-Fn bonds. These linear relationships suggest the absence of cooperative effects in the initial stages of mechanical coupling and adhesion-mediated signaling.
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Affiliation(s)
- A J García
- Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta 30332-0405, USA.
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22
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García AJ, Vega MD, Boettiger D. Modulation of cell proliferation and differentiation through substrate-dependent changes in fibronectin conformation. Mol Biol Cell 1999; 10:785-98. [PMID: 10069818 PMCID: PMC25202 DOI: 10.1091/mbc.10.3.785] [Citation(s) in RCA: 558] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Integrin-mediated cell adhesion to extracellular matrices provides signals essential for cell cycle progression and differentiation. We demonstrate that substrate-dependent changes in the conformation of adsorbed fibronectin (Fn) modulated integrin binding and controlled switching between proliferation and differentiation. Adsorption of Fn onto bacterial polystyrene (B), tissue culture polystyrene (T), and collagen (C) resulted in differences in Fn conformation as indicated by antibody binding. Using a biochemical method to quantify bound integrins in cultured cells, we found that differences in Fn conformation altered the quantity of bound alpha5 and beta1 integrin subunits but not alphav or beta3. C2C12 myoblasts grown on these Fn-coated substrates proliferated to different levels (B > T > C). Immunostaining for muscle-specific myosin revealed minimal differentiation on B, significant levels on T, and extensive differentiation on C. Differentiation required binding to the RGD cell binding site in Fn and was blocked by antibodies specific for this site. Switching between proliferation and differentiation was controlled by the levels of alpha5beta1 integrin bound to Fn, and differentiation was inhibited by anti-alpha5, but not anti-alphav, antibodies, suggesting distinct integrin-mediated signaling pathways. Control of cell proliferation and differentiation through conformational changes in extracellular matrix proteins represents a versatile mechanism to elicit specific cellular responses for biological and biotechnological applications.
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Affiliation(s)
- A J García
- Department of Microbiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
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23
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Abstract
By analyzing the functional binding of alpha5beta1 integrin to adsorbed fibronectin in intact cells, we demonstrate that integrin activation results in linear increases in adhesion strength as a function of ligand density, suggesting that modulation of the receptor-ligand interaction is the dominant mechanism for adhesion during the initial stages of adhesion and that cooperative binding contributes little to initial adhesion strength. Using this experimental framework, we show the existence of three distinct activation states for alpha5beta1 integrin binding to adsorbed fibronectin for both passive, antibody-induced and active, cell-controlled activation. During the initial phase of adhesion, alpha5beta1 integrin is activated in an energy-dependent process from the nonbinding ground state to an intermediate state in which the receptor binds fibronectin and provides significant mechanical coupling. In later stages of adhesion maturation, alpha5beta1 integrin is activated to a higher binding state, which provides significant increases in adhesion strength compared with the intermediate state. These multiple binding states most likely result from different integrin conformations and reflect distinct interactions between alpha5beta1 and sites on adsorbed fibronectin. Multiple activation states for alpha5beta1 suggest the existence of distinct stages in adhesion signaling and strengthening and can provide a versatile mechanism for the regulation of adhesive interactions.
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Affiliation(s)
- A J García
- Department of Microbiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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24
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Garde JJ, Ortiz N, García AJ, Gallego L, Landete-Castillejos T, López A. Postmortem assessment of sperm characteristics of the red deer during the breeding season. Arch Androl 1998; 41:195-202. [PMID: 9805148 DOI: 10.3109/01485019808994891] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
This study examined the effect of male age, time lapse between death of individual and collection of its sperm, breeding season (1993, 1995, or 1996), and testicle sampled (left or right) on the cell quality of spermatozoa obtained postmortem from the epididymis of red deer stags (Cervus elaphus hispanicus). A total of 142 sperm samples obtained from 71 free-ranging individuals shot during the breeding season were used to investigate these effects. The spermatozoa were obtained from the cauda epididymis of stags. Immediately after collection, an assessment was made of the proportion of motile spermatozoa (PM), normal morphology (PN), intact acrosomes (PIA), and the osmotic resistance degree of the plasmatic spermatozoa membrane as determined by the cell endosmosis test (E+). Gamete quality was influenced by both the age of the individuals and the lapse between death and collection of sperm (p < 0.001), whereas the year of collection and testicle sampled did not affect sperm quality. Sperm samples were classified in three groups: excellent, acceptable, or unacceptable, depending on the values achieved in the PM, PN, E+, and PIA variables. Acceptable samples had to achieve the following score: PM > 40%, PN > 40%, E+ > 40%, and PIA > 60%. Within this group, samples with a PM > 60% were classified as excellent. The percentage of samples classified as viable (strictly acceptable plus excellent) achieved 59.8% (85 out of 142). These results indicate that it is possible to obtain a remarkable percentage of viable sperm after the death of the deer. This finding might also be useful to obtain embryos of threatened species of wild ungulates.
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Affiliation(s)
- J J Garde
- ETSIA, Dpto. Ciencia y Tecnología Agroforestal, Universidad de Castilla-La Mancha, Albacete, Spain.
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25
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García AJ, Huber F, Boettiger D. Force required to break alpha5beta1 integrin-fibronectin bonds in intact adherent cells is sensitive to integrin activation state. J Biol Chem 1998; 273:10988-93. [PMID: 9556578 DOI: 10.1074/jbc.273.18.10988] [Citation(s) in RCA: 115] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Binding of integrin receptors to extracellular ligands is a complex process involving receptor-ligand interactions at the cell-substrate interface, signals activating the receptors, and assembly of cytoskeletal and adhesion plaque proteins at the cytoplasmic face. To analyze the contribution of these elements to overall cell adhesion, we have developed a model system that characterizes the functional binding characteristic for adhesion receptors as the force required to separate the integrin-ligand bond. A spinning disk device was used to apply a range of controlled hydrodynamic forces to adherent cells. The adhesion of K562 erythroleukemia cells, a cell line expressing a single fibronectin receptor, integrin alpha5beta1, which was uniformly activated with the monoclonal antibody TS2/16, to defined fibronectin surface densities was examined. Cell adhesion strength increased linearly with receptor and ligand densities. Based on chemical equilibrium principles, it is shown that adhesion strength is directly proportional to the number of receptor-ligand bonds. This analysis provides for the definition of a new physical parameter, the adhesion constant psi, which is related to the bond strength and binding equilibrium constant and has units of force-length2. This parameter can be measured by the experimental system presented and is governed by the activation state of integrin receptors. This simplified model isolates the integrin receptor-ligand binding parameters and provides a basis for analysis of the functions of signaling and cytoskeletal elements in the adhesion process.
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Affiliation(s)
- A J García
- Department of Microbiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
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26
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Abstract
Bioactive glasses and ceramics enhance bone formation and bond directly to bone, and have emerged as promising substrates for bone tissue engineering applications. Bone bioactivity involves physicochemical surface reactions and cellular events, including cell attachment to adsorbed extracellular matrix proteins. The effects of fibronectin (Fn) adsorption and glass surface reaction stage on the attachment of osteoblast-like cells (ROS 17/2.8) to bioactive glass were analyzed. Bioactive glass disks were pretreated in a simulated physiologic solution to produce three reaction layers: unreacted glass (BG0), amorphous calcium phosphate (BG1d), and carbonated hydroxyapatite (BG7d). Synthetic hydroxyapatite (sHA) and nonreactive borosilicate glass (CG) were used as controls. A spinning disk device which applied a linear range of forces to attached cells while maintaining uniform chemical conditions at the interface was used to quantify cell adhesion. The number of adherent cells decreased in a sigmoidal fashion with applied force, and the resulting detachment profile provided measurements of adhesion strength. For the same amount of adsorbed Fn, cell adhesion was higher on surface-reacted bioactive glasses (BG1d and BG7d) than on BG0, CG, and sHA. For all substrates, cell attachment was primarily mediated by the RGD binding site of Fn, as demonstrated by blocking experiments with antibodies and RGD peptides. Cell adhesion strength increased linearly with adsorbed Fn surface density. Analysis of this fundamental relationship revealed that improved adhesion to reacted bioactive glasses resulted from enhanced cell receptor-Fn interactions, suggesting substrate-dependent conformational changes in the adsorbed Fn.
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Affiliation(s)
- A J García
- Department of Bioengineering, University of Pennsylvania, Philadelphia 19104, USA
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27
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Abstract
We report a 49-year-old woman with Marfan syndrome who underwent total thyroidectomy for follicular carcinoma. The patient was given 100 mCi of radioactive iodine (131I) followed by levothyroxine (LT4) 0.2 mg/day after surgery. The subsequent five total body scans were negative and thyroglobulin (TG) measurements ranged between undetectable levels to 12 ng/mL. Nine years after thyroidectomy the patient developed bilateral exophthalmos with markedly positive thyroid-stimulating immunoglobulins (TSI), indicating the presence of Graves' disease. TG levels increased and concurrently pulmonary metastases that did not concentrate radioiodine at tracer doses, were diagnosed. Due to these metastatic lesions, the patient received a therapeutic dose of 150 mCi of 131I 1 month after LT4 withdrawal, and a total body scan was made 10 days later. Slight uptake of 131I was found in the right side of the neck, whereas predominant uptake occurred in the right lung base. We suggest that the elevated TSI played a role in the growth of metastases.
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Affiliation(s)
- S B Katz
- Division of Endocrinology, Hospital de Clínicas José de San Martín, University of Buenos Aires, Argentina
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28
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Abstract
Quantitative analysis of cell adhesion is essential in understanding physiological phenomena and developing biotechnological applications. Electrochemical measurements demonstrated that the transport patterns associated with a spinning disc device approximate the fluid flow and mass transport fields for a disc spinning in an infinite fluid. Therefore, this device applies a linear range of forces to attached cells under uniform and constant chemical conditions at the interface. The application of this apparatus for examining cell adhesion to surface-active materials was illustrated by investigating the attachment of osteoblast-like cells to fibronectin adsorbed onto bioactive and non-reactive glasses for different chemical environments. Cells were seeded on fibronectin-coated substrates for 15 min and then subjected to detachment forces for 10 min. The number of adherent cells decreased non-linearly with applied force and the detachment profile was accurately described by a sigmoidal curve fit, as expected for a cell population with normally distributed adhesion properties.
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Affiliation(s)
- A J García
- Department of Bioengineering, University of Pennsylvania, Philadelphia 19104, USA
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29
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Bruno OD, Degrossi OJ, Curutchet HP, Castellanos AA, Alak MC, Arébalo-Cross G, Montesinos M, García AJ, García del Río H, Mezzadri NA. [Tc-99-sestamibi scan in the preoperative localization of abnormal hyperfunctioning parathyroid glands]. Medicina (B Aires) 1996; 56:441-7. [PMID: 9239878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Hyperparathyroidism is a relatively frequent condition mostly due to a solitary parathyroid adenoma. Although it has been claimed that surgical exploration is the best way to visualize the abnormal parathyroid gland, several imaging techniques have been proposed to localize it in order to simplify and shorten the surgical procedure. Echography, thalium-technetium scintigraphy, computerized tomography and nuclear magnetic resonance have shown a mean sensitivity of 75% which can be increased to about 90% by combining 2 or more of these procedures. In this study, we evaluated the utility of Tc-99m-sestamibi scintigraphy in 13 patients with hyperparathyroidism (11 primary, 2 secondary). High resolution neck echography was carried out in all of the cases. Cervical scans were obtained 10-15 min and 3 hours after giving an i.v. injection of 25 mCi Tc-99m-sestamibi in all the patients; suppression studies with combined 131-I were also done. Positive scans were obtained in 11 out of the 13 patients. Abnormal parathyroid glands were found and surgically excised in all the cases (10 adenomas, 1 carcinoma, 2 hyperplasias). Echographic localization had a sensitivity of only 33.3%. On the contrary, Tc-99m-sestamibi showed a sensitivity of 56% for the whole group, increasing to 82% in the 11 patients with primary hyperparathyroidism whereas the positive predictive value was of 91% and 90%, respectively. We conclude that Tc-99m-sestamibi is a very useful tool in localizing abnormal parathyroid glands and should be the first choice before reoperation after surgical failure or before the first parathyroid surgery whenever it is desired to shorten the surgical and anesthetic duration.
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Affiliation(s)
- O D Bruno
- División Endocrinología, Hospital de Clinicas José de San Martín, Facultad de Medicina, Universidad de Buenos Aires, Argentina
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30
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García AJ, Ducheyne P. Numerical analysis of extracellular fluid flow and chemical species transport around and within porous bioactive glass. J Biomed Mater Res 1994; 28:947-60. [PMID: 7983093 DOI: 10.1002/jbm.820280814] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Modeling of the physical phenomena present at the biomaterial-tissue interface provides a valuable tool for examining the underlying mechanisms which influence the overall behavior of the implant-host system. Based on histological data from a previous implantation study (E. Schepers, M. De Clercq, P. Ducheyne, and R. Kempeneers, "Bioactive glass particulate materials as a filler for bone lesions," J. Oral Rehab.; 18, 439-452, 1991, Ref. 1) which documented the differentiation of mesenchymal cells to cells expressing the osteoblastic phenotype in porous bioactive glass, a finite element momentum and mass transport model was constructed. In this analysis, the extracellular compositional variations and fluid flow conditions around and within porous bioactive glass granules were determined. Numerical simulations demonstrated that the interstitial fluid flow around these granules (300-360 microns) is viscosity dominated (low Reynolds number flow) and that the fluid inside the granules remains stagnant. This velocity field results in shear stresses proportional to the velocity gradient at the granule-fluid interface outside the particles and no shear stresses inside the particles. A parametric study on the effect of interstitial fluid flow on chemical species (Na+, Ca+2, HPO(4)-2) transport outside the granules revealed three domains. At low velocities (0-0.1 micron/s), the transport of species is diffusion controlled. At intermediate velocities (1.0-10 microns/s), diffusion and convection contribute to the species transport. The concentration of chemical species is nearly uniform at high velocities (100-800 microns/s). For all three cases, the transport of chemical species within the granules is diffusion controlled. The differences in transport mechanisms and interstitial fluid flow conditions lead to variations in concentrations, reaction rates, and shear stresses between the inside and the outside of the glass granules. These differences may influence cellular migration, attachment, differentiation, and the overall response to these bioactive materials.
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Affiliation(s)
- A J García
- Department of Bioengineering, University of Pennsylvania, Philadelphia 19104
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31
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García AJ, Ríus F, López DR, Martos F, de la Cruz JP, Gómez JA, Sánchez de la Cuesta F. [A microcomputer program for the analysis of the drug-receptor bond using radioligands]. Arch Farmacol Toxicol 1986; 12:71-82. [PMID: 3755582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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