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  1. Article ; Online: Cheerio Sign: Pulmonary Langerhans Cell Histiocytosis.

    García García, Alejandro / Mora Pinilla, Jorge / Raboso Moreno, Beatriz / Río Ramírez, María Teresa / Abad Fernández, Araceli

    Archivos de bronconeumologia

    2024  

    Language Spanish
    Publishing date 2024-03-07
    Publishing country Spain
    Document type Journal Article
    ZDB-ID 733126-5
    ISSN 1579-2129 ; 0300-2896
    ISSN (online) 1579-2129
    ISSN 0300-2896
    DOI 10.1016/j.arbres.2024.02.018
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  2. Article ; Online: Intrapulmonary Schwannoma: A Case Report.

    Mora Pinilla, Jorge / García García, Alejandro / Matesanz López, Cristina / Río Ramírez, María Teresa / Abad Fernández, Araceli

    Archivos de bronconeumologia

    2023  Volume 59, Issue 10, Page(s) 664–665

    MeSH term(s) Humans ; Lung Neoplasms/diagnostic imaging ; Neurilemmoma/diagnostic imaging ; Neurilemmoma/surgery
    Language Spanish
    Publishing date 2023-07-22
    Publishing country Spain
    Document type Case Reports
    ZDB-ID 733126-5
    ISSN 1579-2129 ; 0300-2896
    ISSN (online) 1579-2129
    ISSN 0300-2896
    DOI 10.1016/j.arbres.2023.07.016
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  3. Article ; Online: Monitoring mechanical stimulation for optimal tendon tissue engineering: A mechanical and biological multiscale study.

    Garcia Garcia, Alejandro / Perot, Jean-Baptiste / Beldjilali-Labro, Megane / Dermigny, Quentin / Naudot, Marie / Le Ricousse, Sophie / Legallais, Cecile / Bedoui, Fahmi

    Journal of biomedical materials research. Part A

    2021  Volume 109, Issue 10, Page(s) 1881–1892

    Abstract: To understand the effect of mechanical stimulation on cell response, bone marrow stromal cells were cultured on electrospun scaffolds under two distinct mechanical conditions (static and dynamic). Comparison between initial and final mechanical and ... ...

    Abstract To understand the effect of mechanical stimulation on cell response, bone marrow stromal cells were cultured on electrospun scaffolds under two distinct mechanical conditions (static and dynamic). Comparison between initial and final mechanical and biological properties of the cell-constructs were conducted over 14 days for both culturing conditions. As a result, mechanically stimulated constructs, in contrast to their static counterparts, showed evident mechanical-induced cell orientation, an effective aligned collagen and tenomodulin extracellular matrix. This orientation provides clues on the importance of mechanical stimulation to induce a tendon-like differentiation. In addition, cell and collagen orientation lead to enhanced storage modulus observed under dynamic stimulation. Altogether mechanical stimulation lead to (a) cell and matrix orientation through the sense of the stretch and (b) a dominant elastic response in the cell-constructs with a minor contribution of the viscosity in the global mechanical behavior. Such a correlation could help in further studies to better understand the effect of mechanical stimulation in tissue engineering.
    MeSH term(s) Animals ; Biomechanical Phenomena ; Cell Proliferation ; Extracellular Matrix/metabolism ; Hydroxyproline/metabolism ; Male ; Mesenchymal Stem Cells/cytology ; Polyesters/chemical synthesis ; Polyesters/chemistry ; Rats, Sprague-Dawley ; Stress, Mechanical ; Tendons/physiology ; Tissue Engineering ; Tissue Scaffolds/chemistry ; Rats
    Chemical Substances Polyesters ; polycaprolactone (24980-41-4) ; Hydroxyproline (RMB44WO89X)
    Language English
    Publishing date 2021-04-19
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2099989-6
    ISSN 1552-4965 ; 1549-3296 ; 0021-9304
    ISSN (online) 1552-4965
    ISSN 1549-3296 ; 0021-9304
    DOI 10.1002/jbm.a.37180
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  4. Article ; Online: Multiscale-Engineered Muscle Constructs: PEG Hydrogel Micro-Patterning on an Electrospun PCL Mat Functionalized with Gold Nanoparticles.

    Beldjilali-Labro, Megane / Jellali, Rachid / Brown, Alexander David / Garcia Garcia, Alejandro / Lerebours, Augustin / Guenin, Erwann / Bedoui, Fahmi / Dufresne, Murielle / Stewart, Claire / Grosset, Jean-François / Legallais, Cécile

    International journal of molecular sciences

    2021  Volume 23, Issue 1

    Abstract: The development of new, viable, and functional engineered tissue is a complex and challenging task. Skeletal muscle constructs have specific requirements as cells are sensitive to the stiffness, geometry of the materials, and biological micro-environment. ...

    Abstract The development of new, viable, and functional engineered tissue is a complex and challenging task. Skeletal muscle constructs have specific requirements as cells are sensitive to the stiffness, geometry of the materials, and biological micro-environment. The aim of this study was thus to design and characterize a multi-scale scaffold and to evaluate it regarding the differentiation process of C2C12 skeletal myoblasts. The significance of the work lies in the microfabrication of lines of polyethylene glycol, on poly(ε-caprolactone) nanofiber sheets obtained using the electrospinning process, coated or not with gold nanoparticles to act as a potential substrate for electrical stimulation. The differentiation of C2C12 cells was studied over a period of seven days and quantified through both expression of specific genes, and analysis of the myotubes' alignment and length using confocal microscopy. We demonstrated that our multiscale bio-construct presented tunable mechanical properties and supported the different stages skeletal muscle, as well as improving the parallel orientation of the myotubes with a variation of less than 15°. These scaffolds showed the ability of sustained myogenic differentiation by enhancing the organization of reconstructed skeletal muscle. Moreover, they may be suitable for applications in mechanical and electrical stimulation to mimic the muscle's physiological functions.
    MeSH term(s) Animals ; Cell Adhesion ; Cell Differentiation ; Cell Proliferation ; Cell Survival ; Gold/chemistry ; Hydrogels/chemistry ; Metal Nanoparticles/chemistry ; Metal Nanoparticles/ultrastructure ; Mice ; Microtechnology ; Muscle, Skeletal/physiology ; Myoblasts, Skeletal/cytology ; Polyesters/chemistry ; Polyethylene Glycols/chemistry ; Tissue Engineering ; Tissue Scaffolds/chemistry
    Chemical Substances Hydrogels ; Polyesters ; polycaprolactone (24980-41-4) ; Polyethylene Glycols (3WJQ0SDW1A) ; Gold (7440-57-5)
    Language English
    Publishing date 2021-12-27
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms23010260
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  5. Article: Biomaterials in Tendon and Skeletal Muscle Tissue Engineering: Current Trends and Challenges.

    Beldjilali-Labro, Megane / Garcia Garcia, Alejandro / Farhat, Firas / Bedoui, Fahmi / Grosset, Jean-François / Dufresne, Murielle / Legallais, Cécile

    Materials (Basel, Switzerland)

    2018  Volume 11, Issue 7

    Abstract: Tissue engineering is a promising approach to repair tendon and muscle when natural healing fails. Biohybrid constructs obtained after cells’ seeding and culture in dedicated scaffolds have indeed been considered as relevant tools for mimicking native ... ...

    Abstract Tissue engineering is a promising approach to repair tendon and muscle when natural healing fails. Biohybrid constructs obtained after cells’ seeding and culture in dedicated scaffolds have indeed been considered as relevant tools for mimicking native tissue, leading to a better integration in vivo. They can also be employed to perform advanced in vitro studies to model the cell differentiation or regeneration processes. In this review, we report and analyze the different solutions proposed in literature, for the reconstruction of tendon, muscle, and the myotendinous junction. They classically rely on the three pillars of tissue engineering, i.e., cells, biomaterials and environment (both chemical and physical stimuli). We have chosen to present biomimetic or bioinspired strategies based on understanding of the native tissue structure/functions/properties of the tissue of interest. For each tissue, we sorted the relevant publications according to an increasing degree of complexity in the materials’ shape or manufacture. We present their biological and mechanical performances, observed in vitro and in vivo when available. Although there is no consensus for a gold standard technique to reconstruct these musculo-skeletal tissues, the reader can find different ways to progress in the field and to understand the recent history in the choice of materials, from collagen to polymer-based matrices.
    Language English
    Publishing date 2018-06-29
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma11071116
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  6. Article ; Online: The combination of a poly-caprolactone/nano-hydroxyapatite honeycomb scaffold and mesenchymal stem cells promotes bone regeneration in rat calvarial defects.

    Naudot, Marie / Garcia Garcia, Alejandro / Jankovsky, Nicolas / Barre, Anaïs / Zabijak, Luciane / Azdad, Soufiane Zakaria / Collet, Louison / Bedoui, Fahmi / Hébraud, Anne / Schlatter, Guy / Devauchelle, Bernard / Marolleau, Jean-Pierre / Legallais, Cécile / Le Ricousse, Sophie

    Journal of tissue engineering and regenerative medicine

    2020  Volume 14, Issue 11, Page(s) 1570–1580

    Abstract: Bone tissue engineering goes beyond the limitations of conventional methods of treating bone loss, such as autograft-induced morbidity and a lack of integration for large grafts. Novel biomimicry approaches (using three-dimensional [3D] electrospinning ... ...

    Abstract Bone tissue engineering goes beyond the limitations of conventional methods of treating bone loss, such as autograft-induced morbidity and a lack of integration for large grafts. Novel biomimicry approaches (using three-dimensional [3D] electrospinning and printing techniques) have been designed to offer the most appropriate environment for cells and thus promote bone regeneration. In the present study, we assessed the bone regeneration properties of a composite 3D honeycomb structure from the electrostatic template-assisted deposition process by an alternate deposition of electrospun polycaprolactone (PCL) nanofibers and electrosprayed hydroxyapatite nanoparticles (nHA) on a honeycomb micropatterned substrate. We first confirmed the cytocompatibility of this honeycomb PCL-nHA scaffold in culture with bone marrow-derived mesenchymal stem cells (BM-MSCs). The scaffold was then implanted (alone or with seeded MSCs) for 2 months in a rat critical-sized calvarial defect model. The observation of new bone synthesis in situ (monitored using microcomputed tomography every 2 weeks and a histological assessment upon extraction) demonstrated that the honeycomb PCL-nHA scaffold was osteoconductive. Moreover, the combination of the scaffold with BM-MSCs was associated with significantly greater bone volume and mineralized regeneration during the 2-month experiment. The combination of the biomimetic honeycomb PCL-nHA scaffold with patient mesenchymal stem cells might therefore have great potential for clinical applications and specifically in maxillofacial surgery.
    MeSH term(s) Animals ; Bone Regeneration/drug effects ; Durapatite/pharmacology ; Male ; Mesenchymal Stem Cells/cytology ; Mesenchymal Stem Cells/drug effects ; Nanofibers/chemistry ; Polyesters/pharmacology ; Prosthesis Implantation ; Rats, Sprague-Dawley ; Skull/diagnostic imaging ; Skull/drug effects ; Skull/pathology ; Tissue Scaffolds/chemistry ; X-Ray Microtomography
    Chemical Substances Polyesters ; polycaprolactone (24980-41-4) ; Durapatite (91D9GV0Z28)
    Language English
    Publishing date 2020-09-15
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2316155-3
    ISSN 1932-7005 ; 1932-6254
    ISSN (online) 1932-7005
    ISSN 1932-6254
    DOI 10.1002/term.3114
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  7. Article ; Online: Alpha-fetoprotein (AFP) modulates the effect of serum albumin on brain development by restraining the neurotrophic effect of oleic acid.

    García-García, Alejandro G / Polo-Hernández, Erica / Tabernero, Arantxa / Medina, José M

    Brain research

    2015  Volume 1624, Page(s) 45–58

    Abstract: We have previously shown that serum albumin controls perinatal rat brain development through the regulation of oleic acid synthesis by astrocytes. In fact, oleic acid synthesized and released by astrocytes promoted neurite growth, neuron migration and ... ...

    Abstract We have previously shown that serum albumin controls perinatal rat brain development through the regulation of oleic acid synthesis by astrocytes. In fact, oleic acid synthesized and released by astrocytes promoted neurite growth, neuron migration and the arrangement of prospective synapses. In this work we show that alpha-fetoprotein (AFP) is also present in the brain during embryonic development, its concentrations peaking at E15.5 and at E19.5. However, after E19.5 AFP concentrations plummeted concurrently with a sharp increase in serum albumin concentrations. At E15.5, AFP is present in caudal regions of the brain, particularly in brain areas undergoing differentiation during this period, such as the thalamic reticular nucleus of the thalamus, the hypothalamus, the amygdala and the hippocampus. Albumin was not detected in the brain at E15.5 but stained brain cells substantially on day E19.5, showing a very similar distribution to that of AFP under the same circumstances. The concentrations of free oleic acid in the brain were inversely correlated with those of AFP, suggesting that the signals elicited by AFP and oleic acid can be inversely associated. GAP-43, a marker of axonal growth that is highly expressed by the presence of oleic acid, was not co-localized with AFP except in the marginal zone and areas delimiting the subplate. AFP prevented the increase in GAP-43 expression caused by the presence of oleic acid in neurons in primary culture in vitro and in organotypic cultures of embryonic rat brain ex vivo, suggesting that AFP may modulate the effect of serum albumin on brain development.
    MeSH term(s) Age Factors ; Animals ; Animals, Newborn ; Brain/embryology ; Brain/growth & development ; Brain/metabolism ; Cells, Cultured ; Embryo, Mammalian ; GAP-43 Protein/metabolism ; Gene Expression Regulation, Developmental/drug effects ; Gene Expression Regulation, Developmental/physiology ; In Vitro Techniques ; Neurons/drug effects ; Neurons/metabolism ; Oleic Acid/metabolism ; Oleic Acid/pharmacology ; Organ Culture Techniques ; Rats ; Rats, Wistar ; Serum Albumin/metabolism ; alpha-Fetoproteins/metabolism ; alpha-Fetoproteins/pharmacology
    Chemical Substances GAP-43 Protein ; Serum Albumin ; alpha-Fetoproteins ; Oleic Acid (2UMI9U37CP)
    Language English
    Publishing date 2015-10-22
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1200-2
    ISSN 1872-6240 ; 0006-8993
    ISSN (online) 1872-6240
    ISSN 0006-8993
    DOI 10.1016/j.brainres.2015.07.021
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  8. Article ; Online: Manufacturing of Human Tissues as off-the-Shelf Grafts Programmed to Induce Regeneration.

    Pigeot, Sébastien / Klein, Thibaut / Gullotta, Fabiana / Dupard, Steven J / Garcia Garcia, Alejandro / García-García, Andres / Prithiviraj, Sujeethkumar / Lorenzo, Pilar / Filippi, Miriam / Jaquiery, Claude / Kouba, Loraine / Asnaghi, M Adelaide / Raina, Deepak Bushan / Dasen, Boris / Isaksson, Hanna / Önnerfjord, Patrik / Tägil, Magnus / Bondanza, Attilio / Martin, Ivan /
    Bourgine, Paul E

    Advanced materials (Deerfield Beach, Fla.)

    2021  Volume 33, Issue 43, Page(s) e2103737

    Abstract: Design criteria for tissue-engineered materials in regenerative medicine include robust biological effectiveness, off-the-shelf availability, and scalable manufacturing under standardized conditions. For bone repair, existing strategies rely on primary ... ...

    Abstract Design criteria for tissue-engineered materials in regenerative medicine include robust biological effectiveness, off-the-shelf availability, and scalable manufacturing under standardized conditions. For bone repair, existing strategies rely on primary autologous cells, associated with unpredictable performance, limited availability and complex logistic. Here, a conceptual shift based on the manufacturing of devitalized human hypertrophic cartilage (HyC), as cell-free material inducing bone formation by recapitulating the developmental process of endochondral ossification, is reported. The strategy relies on a customized human mesenchymal line expressing bone morphogenetic protein-2 (BMP-2), critically required for robust chondrogenesis and concomitant extracellular matrix (ECM) enrichment. Following apoptosis-driven devitalization, lyophilization, and storage, the resulting off-the-shelf cartilage tissue exhibits unprecedented osteoinductive properties, unmatched by synthetic delivery of BMP-2 or by living engineered grafts. Scalability and pre-clinical efficacy are demonstrated by bioreactor-based production and subsequent orthotopic assessment. The findings exemplify the broader paradigm of programming human cell lines as biological factory units to engineer customized ECMs, designed to activate specific regenerative processes.
    MeSH term(s) Osteogenesis
    Language English
    Publishing date 2021-09-05
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.202103737
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  9. Article ; Online: Poly(ε-caprolactone)/Hydroxyapatite 3D Honeycomb Scaffolds for a Cellular Microenvironment Adapted to Maxillofacial Bone Reconstruction.

    Garcia Garcia, Alejandro / Hébraud, Anne / Duval, Jean-Luc / Wittmer, Corinne R / Gaut, Ludovic / Duprez, Delphine / Egles, Christophe / Bedoui, Fahmi / Schlatter, Guy / Legallais, Cecile

    ACS biomaterials science & engineering

    2018  Volume 4, Issue 9, Page(s) 3317–3326

    Abstract: The elaboration of biomimetic materials inspired from the specific structure of native bone is one the main goal of tissue engineering approaches. To offer the most appropriate environment for bone reconstruction, we combined electrospinning and ... ...

    Abstract The elaboration of biomimetic materials inspired from the specific structure of native bone is one the main goal of tissue engineering approaches. To offer the most appropriate environment for bone reconstruction, we combined electrospinning and electrospraying to elaborate an innovative scaffold composed of alternating layers of polycaprolactone (PCL) and hydroxyapatite (HA). In our approach, the electrospun PCL was shaped into a honeycomb-like structure with an inner diameter of 160 μm, capable of providing bone cells with a 3D environment while ensuring the material biomechanical strength. After 5 days of culture without any differentiation factor, the murine embryonic cell line demonstrated excellent cell viability on contact with the PCL-HA structures as well as active colonization of the scaffold. The cell differentiation, as tested by RT-qPCR, revealed a 6-fold increase in the expression of the RNA of the Bglap involved in bone mineralization as compared to a classical 2D culture. This differentiation of the cells into osteoblasts was confirmed by alkaline phosphatase staining of the scaffold cultivated with the cell lineage. Later on, organotypic cultures of embryonic bone tissues showed the high capacity of the PCL-HA honeycomb structure to guide the migration of differentiated bone cells throughout the cavities and the ridge of the biomaterial, with a colonization surface twice as big as that of the control. Taken together, our results indicate that PCL-HA honeycomb structures are biomimetic supports that promotes in vitro osteocompatibility, osteoconduction, and osteoinduction and could be suitable for being used for bone reconstruction in complex situations such as the repair of maxillofacial defects.
    Language English
    Publishing date 2018-08-28
    Publishing country United States
    Document type Journal Article
    ISSN 2373-9878
    ISSN (online) 2373-9878
    DOI 10.1021/acsbiomaterials.8b00521
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  10. Article ; Online: Oleic acid synthesized in the periventricular zone promotes axonogenesis in the striatum during brain development.

    Polo-Hernández, Erica / De Castro, Fernando / García-García, Alejandro G / Tabernero, Arantxa / Medina, José M

    Journal of neurochemistry

    2010  Volume 114, Issue 6, Page(s) 1756–1766

    Abstract: Our previous works showed that oleic acid synthesized in vitro by astrocytes in response to albumin behaves as a neurotrophic factor in neurons, up-regulating several proteins, such as the axonal growth marker growth-associated protein 43(GAP-43). ... ...

    Abstract Our previous works showed that oleic acid synthesized in vitro by astrocytes in response to albumin behaves as a neurotrophic factor in neurons, up-regulating several proteins, such as the axonal growth marker growth-associated protein 43(GAP-43). Although the molecular mechanism of this process is fairly known, there is no evidence pinpointing the region/s in which oleic acid is synthesized. In this study, we show that the rate-limiting enzyme in oleic acid synthesis, stearoyl-CoA desaturase (SCD-1), is located in the periventricular zone of the brain of newborn rats, simultaneously to an increase in the amount of free oleic acid in the forebrain. In addition, the spatio-temporal presence of albumin - the signal that promotes oleic acid synthesis - and that of GAP-43 are correlated with that of SCD-1. Using organotypic slice cultures, we found that albumin up-regulates SCD-1 and stimulates the growth of GAP-43-positive axons in the striatum. The effect of albumin on GAP-43 was reduced when SCD-1 was silenced by siRNA. In conclusion, our results suggest that albumin up-regulates axonogenesis in the striatum by increasing the amount of the neurotrophic factor oleic acid synthesized by SCD-1 in the periventricular zone of the newborn brain.
    MeSH term(s) Albumins/metabolism ; Animals ; Animals, Newborn ; Axons/physiology ; Cerebral Ventricles/growth & development ; Cerebral Ventricles/metabolism ; Cerebral Ventricles/ultrastructure ; Corpus Striatum/growth & development ; Corpus Striatum/metabolism ; Corpus Striatum/ultrastructure ; GAP-43 Protein/biosynthesis ; Gene Expression Regulation, Developmental ; Oleic Acid/biosynthesis ; RNA, Small Interfering/genetics ; Rats ; Rats, Wistar ; Stearoyl-CoA Desaturase/genetics ; Stearoyl-CoA Desaturase/metabolism ; Tissue Culture Techniques
    Chemical Substances Albumins ; GAP-43 Protein ; RNA, Small Interfering ; Oleic Acid (2UMI9U37CP) ; Stearoyl-CoA Desaturase (EC 1.14.19.1)
    Language English
    Publishing date 2010-09
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 80158-6
    ISSN 1471-4159 ; 0022-3042 ; 1474-1644
    ISSN (online) 1471-4159
    ISSN 0022-3042 ; 1474-1644
    DOI 10.1111/j.1471-4159.2010.06891.x
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