26
|
Fuentes F, Zayas H, Aguirre A. Trigeminal neuralgia for cerebral surgery, treatment and case report. Int J Oral Maxillofac Surg 2017. [DOI: 10.1016/j.ijom.2017.02.928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
27
|
Abstract
Modern technology has allowed us to understand better the functions of saliva and now provides a rationale for developing: (1) diagnostic reagents for monitoring oral and systemic health status and (2) replacement therapies for individuals with salivary dysfunctions. Several areas of dental research are directed at augmenting or enhancing both the quality and quantity of saliva for individuals with dry mouth. An “intrinsic” approach is being explored which utilizes medications such as pilocarpine and bromhexine to stimulate the salivary glands to produce more saliva. An “extrinsic” approach proposes to use topically applied artificial saliva. Studies in our laboratory have been directed toward developing artificial salivas which incorporate many of the protective features of “native” saliva. An ideal artificial saliva should be “long-lasting”, provide lubrication, inhibit colonization of microflora responsible for dental caries and gingivitis, and coat the oral soft tissues for protection against environmental insult and desiccation. Studies are currently under way to determine the structural requirements of salivary molecules responsible for these protective functions. Composite salivary molecules consisting of multiple biologically active or “functional domains” could then be designed and synthesized based upon primary sequence and conformational analyses, computer-assisted structural predictions, and in vitro testing. These supcrsalivary substances could then be used as saliva substitutes for targeting to selected oral surfaces to promote mineralization, hydration, and/or regulate microbial-mediated disease.
Collapse
|
28
|
Jacob J, Miró Ò, Herrero P, Martín-Sánchez F, Gil V, Tost J, Aguirre A, Escoda R, Alquézar A, Andueza J, Llorens P. Predicción de la mortalidad a muy corto plazo de los pacientes con insuficiencia cardiaca crónica agudizada: escala EAHFE-3D. Med Intensiva 2016; 40:348-55. [DOI: 10.1016/j.medin.2015.07.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Revised: 07/24/2015] [Accepted: 07/24/2015] [Indexed: 02/01/2023]
|
29
|
Miró Ò, Escoda R, Martín-Sánchez F, Herrero P, Jacob J, Rizzi M, Aguirre A, Andueza J, Bueno H, Llorens P. Assessment of the knowledge and perception of support of patients with heart failure SOPICA study IN SPAIN. Rev Clin Esp 2016. [DOI: 10.1016/j.rceng.2016.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
30
|
Miró Ò, Escoda R, Martín-Sánchez FJ, Herrero P, Jacob J, Rizzi M, Aguirre A, Andueza JA, Bueno H, Llorens P. Assessment of the knowledge and perception of support of patients with heart failure SOPICA study IN SPAIN. Rev Clin Esp 2016; 216:237-47. [PMID: 27000272 DOI: 10.1016/j.rce.2016.02.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2015] [Revised: 02/22/2016] [Accepted: 02/26/2016] [Indexed: 10/22/2022]
Abstract
OBJECTIVE To understand the perceptions of patients with heart failure (HF) concerning their disease, treatment and support, as well as the specialists who provide care after a decompensation, and to determine whether there is a relationship between the type of specialist involved in the follow-up and the medium-term prognosis. METHODS A multicentre, prospective cohort study consecutively included patients with acute HF in the emergency department. The patients were interviewed by telephone 91-180days after their emergency department visit. We investigated the relationship between the type of specialist who performed the follow-up and the emergency department visits or hospitalisations using Cox regression models, with progressive adjustment by groups of potential confounders of these relationships. RESULTS We interviewed 785 patients. Thirty-three percent (95%CI: 30%-36%) considered their disease mild, 64% (60%-67%) required help from third parties for daily activities, 65% (61%-68%) had no recent therapeutic changes, and 69% (67%-72%) received the same treatment in the exacerbations. The perceived support varied significantly depending on the factor under consideration (from greater to lesser: family, hospital, emergency department, health centre, religion and patient associations; p<.05 in all comparisons). Thirty-nine percent (36%-43%) of the patients with decompensations consulted directly with the emergency department, with no prior changes in treatment. At discharge, general practitioners (74%, 71%-77%) and cardiologists (74%, 70%-77%) were the most involved in the follow-up, although the specialty was not related to the prognosis. CONCLUSION There are various aspects of the perception of patients with HF concerning their disease that are susceptible to future interventions. Patient follow-up involves various specialties, but all achieve similar results in the medium term.
Collapse
|
31
|
Hamzehlou S, Ballard N, Reyes Y, Aguirre A, Asua JM, Leiza JR. Analyzing the discrepancies in the activation energies of the backbiting and β-scission reactions in the radical polymerization of n-butyl acrylate. Polym Chem 2016. [DOI: 10.1039/c5py01990g] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Activaton energies for backbiting and β-scission reactions for the polymerization of n-BA were determined by fitting experimental data to a mathematical model. The activation energy for backbiting was higher and that for β-scission lower than those accepted in the literature.
Collapse
|
32
|
Kurian L, Aguirre A, Sancho-Martinez I. Identification of Novel Long Noncoding RNAs Underlying Vertebrate Cardiovascular Development. J Vasc Surg 2016. [DOI: 10.1016/j.jvs.2015.11.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
33
|
Hernández-Ortiz V, Aguirre A. A new species of the Neotropical genus Beebeomyia(Diptera: Richardiidae) with observations of its biology on Dieffenbachia oerstedii(Araceae). J NAT HIST 2015. [DOI: 10.1080/00222933.2015.1005712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
34
|
Fernández Nebro A, Carreira P, Blanco R, Pérez Venegas J, Olive A, Andreu J, Aguirre A, Vela P, Marenco J, Nolla J, Zea A, Pego J, Julia A, Pluma A, Alonso A, Lopez Lasanta M, Marsal S. AB1107 Epidemiological Comparative Analysis in a Large Cohort of Systemic Lupus Erithematosus Patients: Results of the Spanish IMID Consortium. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.4118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
35
|
Carlos F, Aguirre A, Naranjo M, Gutiérrez C, Querol J. FRI0175 Indirect Treatment Comparisons and Network Meta-Analysis among Biological Agents for Rheumatoid Arthritis: A Systematic Review of Published Literature. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.2512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
36
|
Leon T, Aguirre A, Pesce C, Sanhueza P, Toro P. Electroconvulsive therapy for catatonia in juvenile neuropsychiatric lupus. Lupus 2014; 23:1066-8. [PMID: 24786782 DOI: 10.1177/0961203314533603] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Neuropsychiatric manifestations are serious and frequent complications of systemic lupus erythematous (SLE). Catatonia is a neuropsychiatric disorder characterized by motor disturbance (including waxy flexibility and catalepsy), stupor, excitement, negativism, mutism, echopraxia and echolalia. Catatonia associated with SLE has been only rarely reported, especially in children. Here we present a case of a 14-year-old patient encountered in consultation-liaison psychiatry who presented catatonia associated with SLE. Her catatonia was refractory to treatment with pulse methylprednisolone, intravenous cyclophosphamide and rituximab. The patient responded to a combined therapy of electroconvulsive therapy and benzodiazepines. The present case suggests that although rarely reported, catatonia seen in the background of SLE should be promptly identified and treated to reduce the morbidity.
Collapse
|
37
|
Leigh NJ, Nelson JW, Mellas RE, Aguirre A, Baker OJ. Expression of resolvin D1 biosynthetic pathways in salivary epithelium. J Dent Res 2014; 93:300-5. [PMID: 24389810 DOI: 10.1177/0022034513519108] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Resolvins are potent anti-inflammatory mediators derived from ω-3 fatty acids. Results from our previous studies indicated that resolvin D1 (RvD1) blocks pro-inflammatory responses in salivary glands. Furthermore, RvD1 enhances salivary epithelial integrity, demonstrating its potential use for the restoration of salivary gland function in Sjögren's syndrome (SS). We investigated whether the RvD1 biosynthetic machinery (e.g., cytosolic phospholipase A2, calcium-independent phospholipase A2, 12/15 and 5-lipoxygenase) is expressed in mouse submandibular glands (mSMG), using qPCR and Western blot analyses. Additionally, we determined the localization of RvD1 biosynthetic machinery in mSMG and human minor salivary glands (hMSG), with and without SS, using confocal microscopy. Finally, we measured RvD1 levels in cell supernatants from mSMG cell cultures and freshly isolated mSMG cells, with and without SS, using ELISA. Our results indicate that: (1) RvD1 machinery is expressed in mouse and human salivary glands; (2) polar distribution of RvD1 biosynthetic machinery is lost in hMSG with SS; (3) RvD1 levels in mSMG cell culture supernatants increased with time; and (4) RvD1 levels in mSMG cell supernatants, with and without SS, were similar. These studies demonstrate that the RvD1 biosynthesis machinery is expressed and functional in salivary glands with and without SS.
Collapse
MESH Headings
- Animals
- Arachidonate 12-Lipoxygenase/analysis
- Arachidonate 12-Lipoxygenase/metabolism
- Arachidonate 15-Lipoxygenase/analysis
- Arachidonate 15-Lipoxygenase/metabolism
- Arachidonate 5-Lipoxygenase/analysis
- Arachidonate 5-Lipoxygenase/metabolism
- Cell Culture Techniques
- Cell Membrane/enzymology
- Cells, Cultured
- Cytosol/enzymology
- Docosahexaenoic Acids/analysis
- Docosahexaenoic Acids/biosynthesis
- Epithelium/metabolism
- Female
- Humans
- Mice
- Mice, Inbred C57BL
- Mice, Inbred NOD
- Mice, Inbred Strains
- Phospholipases A2, Calcium-Independent/analysis
- Phospholipases A2, Calcium-Independent/metabolism
- Phospholipases A2, Cytosolic/analysis
- Phospholipases A2, Cytosolic/metabolism
- Salivary Glands, Minor/metabolism
- Salivary Glands, Minor/pathology
- Sjogren's Syndrome/metabolism
- Sjogren's Syndrome/pathology
- Submandibular Gland/cytology
- Submandibular Gland/metabolism
Collapse
|
38
|
Zataray J, Aguirre A, de la Cal J, Leiza J. Polymerization of N-Vinyl Formamide in Homogeneous and Heterogeneous Media and Surfactant Free Emulsion Polymerization of MMA Using Polyvinylamine as Stabilizer. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/masy.201300083] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
39
|
Cuadrado MJ, Bertolaccini ML, Seed PT, Tektonidou MG, Aguirre A, Mico L, Gordon C, Ruiz-Irastorza G, Egurbide MV, Gil A, Espinosa G, Houssiau F, Rahman A, Martin H, McHugh N, Galindo M, Akil M, Amigo MC, Murru V, Khamashta MA. Low-dose aspirin vs low-dose aspirin plus low-intensity warfarin in thromboprophylaxis: a prospective, multicentre, randomized, open, controlled trial in patients positive for antiphospholipid antibodies (ALIWAPAS). Rheumatology (Oxford) 2013; 53:275-84. [DOI: 10.1093/rheumatology/ket313] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
40
|
Quest AFG, Lobos-González L, Nuñez S, Sanhueza C, Fernández JG, Aguirre A, Rodríguez D, Leyton L, Torres V. The caveolin-1 connection to cell death and survival. Curr Mol Med 2013; 13:266-81. [PMID: 23228128 DOI: 10.2174/156652413804810745] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Revised: 10/23/2012] [Accepted: 11/01/2012] [Indexed: 11/22/2022]
Abstract
Caveolins are a family of membrane proteins required for the formation of small plasma membrane invaginations called caveolae that are implicated in cellular trafficking processes. In addition to this structural role, these scaffolding proteins modulate numerous intracellular signaling pathways; often via direct interaction with specific binding partners. Caveolin-1 is particularly well-studied in this respect and has been attributed a large variety of functions. Thus, Caveolin-1 also represents the best-characterized isoform of this family with respect to its participation in cancer. Rather strikingly, available evidence indicates that Caveolin-1 belongs to a select group of proteins that function, depending on the cellular settings, both as tumor suppressor and promoter of cellular traits commonly associated with enhanced malignant behavior, such as metastasis and multi-drug resistance. The mechanisms underlying such ambiguity in Caveolin-1 function constitute an area of great interest. Here, we will focus on discussing how Caveolin-1 modulates cell death and survival pathways and how this may contribute to a better understanding of the ambiguous role this protein plays in cancer.
Collapse
|
41
|
Aguirre A, Borneo R, León A. Antimicrobial, mechanical and barrier properties of triticale protein films incorporated with oregano essential oil. FOOD BIOSCI 2013. [DOI: 10.1016/j.fbio.2012.12.001] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
42
|
G. Quest A, Lobos-Gonzalez L, Nunez S, Sanhueza C, Fernandez JG, Aguirre A, Rodriguez D, Leyton L, Torres V. The Caveolin-1 Connection to Cell Death and Survival. Curr Mol Med 2012. [DOI: 10.2174/1566524011313020004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
43
|
Barrientos V, Aguirre A, Borneo R. Chia (Salvia hispanica) can be used to manufacture sugar-snap cookies with an improved nutritional value. INTERNATIONAL JOURNAL OF FOOD STUDIES 2012. [DOI: 10.7455/ijfs/1.2.2012.a4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Technologists and nutritionists are always looking for alternative ingredients to use in their formulations to improve functional and nutritional properties. Therefore, cookies using Chia (Salvia hispanica), a grain with high quality nutrients, were prepared. The nutritional value was determined by measuring the chemical composition, mineral content, and the fatty acid composition (saturated, monunsaturated, polyunsaturated, linoleic and linolenic acids). Data obtained from this chemical analysis was used to estimate the nutrients intake and compare them to the dietary reference intakes (DRIs). Cookies supplemented with chia flour contained signicantly more protein, fat, crude fiber, calcium, zinc, and alpha-linolenic (n-3) acid. It was estimated that the supplemented cookies would contribute to the corresponding DRIs in the range of 8.1-13.8% (children) and 6.5-11.0% (males/females) for calcium; and 14.0-18.0% (children) and 6.4-11.3 (males/females) for zinc. The addition of chia flour to the cookies resulted in a product sensorially acceptable with a better fatty acid profile (lower n-6/n-3). Supplemented cookies would contribute to alpha-linolenic DRI in the range of 65.9-134.5% (children), 49.4-100.9% (males), and 53.9-110.0% (females). Dietary intake of protein, fiber, calcium, zinc, and alpha-linolenic (n-3) acid could be increased by the consumption of sugar-snap cookies supplemented with chia flour.
Collapse
|
44
|
|
45
|
Supervía A, Del Baño F, Maldonado G, Pallàs O, Aguirre A, Vilaplana C, Horcajada JP, Martínez-Izquierdo MT. [Predictive factors of 2009 H1N1 virus infection in patients with influenza syndrome]. REVISTA ESPANOLA DE QUIMIOTERAPIA : PUBLICACION OFICIAL DE LA SOCIEDAD ESPANOLA DE QUIMIOTERAPIA 2011; 24:25-31. [PMID: 21412666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
INTRODUCTION Polymerase chain reaction (PCR) testing is one of the better techniques for viral detection in nasopharyngeal swabs. The objective of this study was to assess the percentage of positive swabs and to determine whether there were differences according to PCR positivity. MATERIAL AND METHODS A retrospective study of 362 patients with flu syndrome attended at the Emergency Department between July 15 and December 15, 2009, in whom PCR of nasopharyngeal swabs for the detection of H1N1 2009 influenza virus was performed. Those cases in which swab testing was adequately requested were identified, and patients were divided into two groups according to positive or negative results for H1N1 2009 influenza virus. RESULTS Nasopharyngeal swab was inadequately ordered in 87. In the remaining 275 patients, PCR was positive in 141. Patients with positive nasopharyngeal swabs were younger (mean [SD] age 36.1 [15] vs 42.3 [18] years, P= 0.002), had lower white blood cell, neutrophil and lymphocyte counts, lower serum concentrations of C-reactive protein (5.15 [5] vs 10.5[12] mg/dL, P= 0.036) and lower incidence of radiological infiltrates (20.5% vs 33%, P= 0.036). In the logistic regression analysis, age, serum C-reactive protein levels, and lymphocyte count were independently associated with a positive nasopharyngeal swab. CONCLUSIONS About 50% of patients with flu syndrome had positive nasopharyngeal swabs for H1N1 2009 influenza virus. Age, C-reactive protein, and lymphocyte count were independent predictors of positivity.
Collapse
|
46
|
Pegueroles M, Aguirre A, Engel E, Pavon G, Gil FJ, Planell JA, Migonney V, Aparicio C. Effect of blasting treatment and Fn coating on MG63 adhesion and differentiation on titanium: a gene expression study using real-time RT-PCR. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2011; 22:617-627. [PMID: 21258846 DOI: 10.1007/s10856-011-4229-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2009] [Accepted: 01/04/2011] [Indexed: 05/30/2023]
Abstract
Biomaterial surface properties, via alterations in the adsorbed protein layer, and the presence of specific functional groups can influence integrin binding specificity, thereby modulating cell adhesion and differentiation processes. The adsorption of fibronectin, a protein directly involved in osteoblast adhesion to the extracellular matrix, has been related to different physical and chemical properties of biomaterial surfaces. This study used blasting particles of different sizes and chemical compositions to evaluate the response of MG63 osteoblast-like cells on smooth and blasted titanium surfaces, with and without fibronectin coatings, by means of real-time reverse transcription-polymerase chain reaction (qRT-PCR) assays. This response included (a) expression of the α(5), α(v) and α(3) integrin subunits, which can bind to fibronectin through the RGD binding site, and (b) expression of alkaline phosphatase (ALP) and osteocalcin (OC) as cell-differentiation markers. ALP activity and synthesis of OC were also tested. Cells on SiC-blasted Ti surfaces expressed higher amounts of the α(5) mRNA gene than cells on Al(2)O(3)-blasted Ti surfaces. This may be related to the fact that SiC-blasted surfaces adsorbed higher amounts of fibronectin due to their higher surface free energy and therefore provided a higher number of specific cell-binding sites. Fn-coated Ti surfaces decreased α(5) mRNA gene expression, by favoring the formation of other integrins involved in adhesion over α(5)β(1). The changes in α(5) mRNA expression induced by the presence of fibronectin coatings may moreover influence the osteoblast differentiation pathway, as fibronectin coatings on Ti surfaces also decreased both ALP mRNA expression and ALP activity after 14 and 21 days of cell culture.
Collapse
|
47
|
Valcárcel L, Kortajarena J, García M, Fernández JM, Lezcano E, Losada J, Ruiz J, Álvarez A, Pérez JM, Iriondo M, Aguirre A. C02 Analysis of the instability of the CAG trinucleotide repeat and the age of onset in a Huntington's disease population from the Basque country. Journal of Neurology, Neurosurgery and Psychiatry 2010. [DOI: 10.1136/jnnp.2010.222588.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
48
|
Aguirre A, Planell JA, Engel E. Dynamics of bone marrow-derived endothelial progenitor cell/mesenchymal stem cell interaction in co-culture and its implications in angiogenesis. Biochem Biophys Res Commun 2010; 400:284-91. [PMID: 20732306 DOI: 10.1016/j.bbrc.2010.08.073] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2010] [Accepted: 08/17/2010] [Indexed: 01/07/2023]
Abstract
Tissue engineering aims to regenerate tissues and organs by using cell and biomaterial-based approaches. One of the current challenges in the field is to promote proper vascularization in the implant to prevent cell death and promote host integration. Bone marrow endothelial progenitor cells (BM-EPCs) and mesenchymal stem cells (MSCs) are bone marrow resident stem cells widely employed for proangiogenic applications. In vivo, they are likely to interact frequently both in the bone marrow and at sites of injury. In this study, the physical and biochemical interactions between BM-EPCs and MSCs in an in vitro co-culture system were investigated to further clarify their roles in vascularization. BM-EPC/MSC co-cultures established close cell-cell contacts soon after seeding and self-assembled to form elongated structures at 3days. Besides direct contact, cells also exhibited vesicle transport phenomena. When co-cultured in Matrigel, tube formation was greatly enhanced even in serum-starved, growth factor free medium. Both MSCs and BM-EPCs contributed to these tubes. However, cell proliferation was greatly reduced in co-culture and morphological differences were observed. Gene expression and cluster analysis for wide panel of angiogenesis-related transcripts demonstrated up-regulation of angiogenic markers but down-regulation of many other cytokines. These data suggest that cross-talk occurs in between BM-EPCs and MSCs through paracrine and direct cell contact mechanisms leading to modulation of the angiogenic response.
Collapse
|
49
|
Montufar E, Traykova T, Gil C, Harr I, Almirall A, Aguirre A, Engel E, Planell J, Ginebra M. Foamed surfactant solution as a template for self-setting injectable hydroxyapatite scaffolds for bone regeneration. Acta Biomater 2010; 6:876-85. [PMID: 19835998 DOI: 10.1016/j.actbio.2009.10.018] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2009] [Revised: 10/04/2009] [Accepted: 10/09/2009] [Indexed: 11/27/2022]
Abstract
The application of minimally invasive surgical techniques in the field of orthopaedic surgery has created a growing need for new injectable synthetic materials that can be used for bone grafting. In this work a novel fully synthetic injectable calcium phosphate foam was developed by mixing alpha-tricalcium phosphate (alpha-TCP) powder with a foamed polysorbate 80 solution. Polysorbate 80 is a non-ionic surfactant approved for parenteral applications. The foam was able to retain the porous structure after injection provided that the foamed paste was injected shortly after mixing (typically 2.5 min), and set through the hydrolysis of alpha-TCP to a calcium-deficient hydroxyapatite, thus producing a hydroxyapatite solid foam in situ. The effect of different processing parameters on the porosity, microstructure, injectability and mechanical properties of the hydroxyapatite foams was analysed, and the ability of the pre-set foam to support osteoblastic-like cell proliferation and differentiation was assessed. Interestingly, the concentration of surfactant needed to obtain the foams was lower than that considered safe in drug formulations for parenteral administration. The possibility of combining bioactivity, injectability, macroporosity and self-setting ability in a single fully synthetic material represents a step forward in the design of new materials for bone regeneration compatible with minimally invasive surgical techniques.
Collapse
|
50
|
Aguirre A, González A, Planell JA, Engel E. Extracellular calcium modulates in vitro bone marrow-derived Flk-1+ CD34+ progenitor cell chemotaxis and differentiation through a calcium-sensing receptor. Biochem Biophys Res Commun 2010; 393:156-61. [PMID: 20117086 DOI: 10.1016/j.bbrc.2010.01.109] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2010] [Accepted: 01/27/2010] [Indexed: 10/19/2022]
Abstract
Angiogenesis is a complex process regulated by many cell types and a large variety of biochemical signals such as growth factors, transcription factors, oxygen and nutrient diffusion among others. In the present study, we found out that Flk-1(+) CD34(+) progenitor cells (bone marrow resident cells with an important role in angiogenesis) were responsive to changes in extracellular calcium concentration through a membrane bound, G-protein-coupled receptor sensitive to calcium ions related to the calcium-sensing receptor (CaSR). Calcium was able to induce progenitor cell migration in Boyden chamber experiments and tubulogenesis in Matrigel assays. Addition of anti-CaSR antibodies completely blocked the effect, while CaSR agonist Mg(2+) produced a similar response to that of calcium. Real time RT-PCR for a wide array of angiogenesis-related genes showed increased expression of endothelial markers and signaling pathways involved in angiogenesis. These results suggest calcium could be a physiological modulator of the bone marrow progenitor cell-mediated angiogenic response.
Collapse
|