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  1. AU="Ehrbar, Martin"
  2. AU="Lepre, Davide"
  3. AU="Olszewska, Zuzanna"
  4. AU="Vojta, Leslie"
  5. AU=Wickstrom Eric AU=Wickstrom Eric
  6. AU="Gangavarapu, Sridevi"
  7. AU="Hussein, Hazem Abdelwaheb"
  8. AU=Cai Yixin AU=Cai Yixin
  9. AU="Hüls, Anke"
  10. AU="Poondru, Srinivasu"
  11. AU="Coca, Daniel"
  12. AU="Lebeau, Paul"
  13. AU="Dehghani, Sedigheh"
  14. AU="Ishibashi, Kenji"
  15. AU="Xu, Yanhua"
  16. AU="Matera, Katarzyna"
  17. AU="Ait-Ouarab, Slimane"
  18. AU="Nicola, Coppede"
  19. AU="Dewitt, John M"
  20. AU="Sorin M. Dudea"
  21. AU="Tanusha D. Ramdin"
  22. AU="Hao, Zehui"
  23. AU="Chauhan, Aman"

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  1. Buch ; Online: Nanosized Drug Delivery Systems: Colloids and Gels for Site Specific Targeting

    Cellesi, Francesco / Ehrbar, Martin / Rossi, Filippo

    2020  

    Schlagwörter Civil engineering, surveying & building ; Biotechnology ; nanomedicine ; drug delivery ; nanocarrier (nanoparticle) ; colloids ; gels ; targeting ; growth factors
    Umfang 1 electronic resource (180 pages)
    Verlag Frontiers Media SA
    Dokumenttyp Buch ; Online
    Anmerkung English ; Open Access
    HBZ-ID HT021231297
    ISBN 9782889660223 ; 2889660222
    Datenquelle ZB MED Katalog Medizin, Gesundheit, Ernährung, Umwelt, Agrar

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  2. Artikel ; Online: Enhanced bone regeneration in rat calvarial defects through BMP2 release from engineered poly(ethylene glycol) hydrogels.

    Vallmajo-Martin, Queralt / Millan, Christopher / Müller, Ralph / Weber, Franz E / Ehrbar, Martin / Ghayor, Chafik

    Scientific reports

    2024  Band 14, Heft 1, Seite(n) 4916

    Abstract: The clinical standard therapy for large bone defects, typically addressed through autograft or allograft donor tissue, faces significant limitations. Tissue engineering offers a promising alternative strategy for the regeneration of substantial bone ... ...

    Abstract The clinical standard therapy for large bone defects, typically addressed through autograft or allograft donor tissue, faces significant limitations. Tissue engineering offers a promising alternative strategy for the regeneration of substantial bone lesions. In this study, we harnessed poly(ethylene glycol) (PEG)-based hydrogels, optimizing critical parameters including stiffness, incorporation of arginine-glycine-aspartic acid (RGD) cell adhesion motifs, degradability, and the release of BMP2 to promote bone formation. In vitro we demonstrated that human bone marrow derived stromal cell (hBMSC) proliferation and spreading strongly correlates with hydrogel stiffness and adhesion to RGD peptide motifs. Moreover, the incorporation of the osteogenic growth factor BMP2 into the hydrogels enabled sustained release, effectively inducing bone regeneration in encapsulated progenitor cells. When used in vivo to treat calvarial defects in rats, we showed that hydrogels of low and intermediate stiffness optimally facilitated cell migration, proliferation, and differentiation promoting the efficient repair of bone defects. Our comprehensive in vitro and in vivo findings collectively suggest that the developed hydrogels hold significant promise for clinical translation for bone repair and regeneration by delivering sustained and controlled stimuli from active signaling molecules.
    Mesh-Begriff(e) Rats ; Humans ; Animals ; Bone Regeneration ; Biocompatible Materials/chemistry ; Osteogenesis ; Cell Differentiation ; Hydrogels/chemistry ; Polyethylene Glycols/chemistry ; Bone Morphogenetic Protein 2/pharmacology ; Bone Morphogenetic Protein 2/metabolism
    Chemische Substanzen Biocompatible Materials ; Hydrogels ; Polyethylene Glycols (3WJQ0SDW1A) ; BMP2 protein, human ; Bone Morphogenetic Protein 2
    Sprache Englisch
    Erscheinungsdatum 2024-02-28
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-024-55411-z
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel ; Online: Simple Establishment of a Vascularized Osteogenic Bone Marrow Niche Using Pre-Cast Poly(ethylene Glycol) (PEG) Hydrogels in an Imaging Microplate.

    Krattiger, Lisa A / Mitsi, Maria / Simona, Benjamin R / Ehrbar, Martin

    Journal of visualized experiments : JoVE

    2023  , Heft 195

    Abstract: The bone and bone marrow are highly vascularized and structurally complex organs, and are sites for cancer and metastasis formation. In vitro models recapitulating bone- and bone marrow-specific functions, including vascularization, that are compatible ... ...

    Abstract The bone and bone marrow are highly vascularized and structurally complex organs, and are sites for cancer and metastasis formation. In vitro models recapitulating bone- and bone marrow-specific functions, including vascularization, that are compatible with drug screening are highly desirable. Such models can bridge the gap between simplistic, structurally irrelevant two-dimensional (2D) in vitro models and the more expensive, ethically challenging in vivo models. This article describes a controllable three-dimensional (3D) co-culture assay based on engineered poly(ethylene glycol) (PEG) matrices for the generation of vascularized, osteogenic bone-marrow niches. The PEG matrix design allows the development of 3D cell cultures through a simple cell seeding step requiring no encapsulation, thus enabling the development of complex co-culture systems. Furthermore, the matrices are transparent and pre-cast onto glass-bottom 96-well imaging plates, rendering the system suitable for microscopy. For the assay described here, human bone marrow-derived mesenchymal stromal cells (hBM-MSCs) are cultured first until a sufficiently developed 3D cell network is formed. Subsequently, GFP-expressing human umbilical vein endothelial cells (HUVECs) are added. The culture development is followed by bright-field and fluorescence microscopy. The presence of the hBM-MSC network supports the formation of vascular-like structures that otherwise would not form and that remain stable for at least 7 days. The extent of vascular-like network formation can easily be quantified. This model can be tuned toward an osteogenic bone-marrow niche by supplementing the culture medium with bone morphogenetic protein 2 (BMP-2), which promotes the osteogenic differentiation of the hBM-MSCs, as assessed by increased alkaline phosphatase (ALP) activity at day 4 and day 7 of co-culture. This cellular model can be used as a platform for culturing various cancer cells and studying how they interact with bone- and bone marrow-specific vascular niches. Moreover, it is suitable for automation and high-content analyses, meaning it would enable cancer drug screening under highly reproducible culture conditions.
    Mesh-Begriff(e) Humans ; Osteogenesis ; Bone Marrow ; Hydrogels/chemistry ; Polyethylene Glycols ; Cell Differentiation ; Human Umbilical Vein Endothelial Cells ; Cells, Cultured ; Bone Marrow Cells
    Chemische Substanzen Hydrogels ; Polyethylene Glycols (3WJQ0SDW1A)
    Sprache Englisch
    Erscheinungsdatum 2023-05-19
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Video-Audio Media
    ZDB-ID 2259946-0
    ISSN 1940-087X ; 1940-087X
    ISSN (online) 1940-087X
    ISSN 1940-087X
    DOI 10.3791/65413
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  4. Artikel ; Online: Biomaterial-based treatments for the prevention of preterm birth after iatrogenic rupture of the fetal membranes.

    Avilla-Royo, Eva / Ochsenbein-Kölble, Nicole / Vonzun, Ladina / Ehrbar, Martin

    Biomaterials science

    2022  Band 10, Heft 14, Seite(n) 3695–3715

    Abstract: Minimally invasive interventions to ameliorate or correct fetal abnormalities are becoming a clinical reality. However, the iatrogenic preterm prelabor rupture of the fetal membranes (FMs) (iPPROM), which may result in preterm birth, remains a main ... ...

    Abstract Minimally invasive interventions to ameliorate or correct fetal abnormalities are becoming a clinical reality. However, the iatrogenic preterm prelabor rupture of the fetal membranes (FMs) (iPPROM), which may result in preterm birth, remains a main complication. Despite the cause of iPPROM not being fully known, the puncture created by the fetoscope remains unhealed until the end of the pregnancy, which permits chorioamniotic separation and amniotic fluid leakage. Hence, there is an urgent need to develop strategies to treat the FMs after minimally invasive interventions. However, none of the previously tested strategies has been clinically translated. Here, we review the current knowledge about the FMs starting from their development and present the different models that have been developed both
    Mesh-Begriff(e) Biocompatible Materials/therapeutic use ; Extraembryonic Membranes ; Female ; Fetal Membranes, Premature Rupture/drug therapy ; Fetal Membranes, Premature Rupture/etiology ; Fetal Membranes, Premature Rupture/prevention & control ; Humans ; Iatrogenic Disease/prevention & control ; Infant, Newborn ; Pregnancy ; Premature Birth/prevention & control
    Chemische Substanzen Biocompatible Materials
    Sprache Englisch
    Erscheinungsdatum 2022-07-12
    Erscheinungsland England
    Dokumenttyp Journal Article ; Review
    ZDB-ID 2693928-9
    ISSN 2047-4849 ; 2047-4830
    ISSN (online) 2047-4849
    ISSN 2047-4830
    DOI 10.1039/d2bm00401a
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Artikel: Biomaterial-based treatments for the prevention of preterm birth after iatrogenic rupture of the fetal membranes

    Avilla-Royo, Eva / Ochsenbein-Kölble, Nicole / Vonzun, Ladina / Ehrbar, Martin

    Biomaterials science. 2022 July 12, v. 10, no. 14

    2022  

    Abstract: Minimally invasive interventions to ameliorate or correct fetal abnormalities are becoming a clinical reality. However, the iatrogenic preterm prelabor rupture of the fetal membranes (FMs) (iPPROM), which may result in preterm birth, remains a main ... ...

    Abstract Minimally invasive interventions to ameliorate or correct fetal abnormalities are becoming a clinical reality. However, the iatrogenic preterm prelabor rupture of the fetal membranes (FMs) (iPPROM), which may result in preterm birth, remains a main complication. Despite the cause of iPPROM not being fully known, the puncture created by the fetoscope remains unhealed until the end of the pregnancy, which permits chorioamniotic separation and amniotic fluid leakage. Hence, there is an urgent need to develop strategies to treat the FMs after minimally invasive interventions. However, none of the previously tested strategies has been clinically translated. Here, we review the current knowledge about the FMs starting from their development and present the different models that have been developed both in vitro and ex vivo. We also systematically review and summarize the different approaches that have been investigated to plug, seal, heal or suture the FMs both in preclinical and clinical studies and discuss their limitations, outcomes, and future directions.
    Schlagwörter amniotic fluid ; biocompatible materials ; pregnancy ; premature birth ; seals
    Sprache Englisch
    Erscheinungsverlauf 2022-0712
    Umfang p. 3695-3715.
    Erscheinungsort The Royal Society of Chemistry
    Dokumenttyp Artikel
    ZDB-ID 2693928-9
    ISSN 2047-4849 ; 2047-4830
    ISSN (online) 2047-4849
    ISSN 2047-4830
    DOI 10.1039/d2bm00401a
    Datenquelle NAL Katalog (AGRICOLA)

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  6. Artikel: Inspired by Nature: Hydrogels as Versatile Tools for Vascular Engineering.

    Blache, Ulrich / Ehrbar, Martin

    Advances in wound care

    2018  Band 7, Heft 7, Seite(n) 232–246

    Abstract: Significance: ...

    Abstract Significance:
    Sprache Englisch
    Erscheinungsdatum 2018-06-25
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Review
    ZDB-ID 2650541-1
    ISSN 2162-1934 ; 2162-1918
    ISSN (online) 2162-1934
    ISSN 2162-1918
    DOI 10.1089/wound.2017.0760
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  7. Artikel: Editorial: Nanosized Drug Delivery Systems: Colloids and Gels for Site Specific Targeting.

    Ehrbar, Martin / Rossi, Filippo / Cellesi, Francesco

    Frontiers in bioengineering and biotechnology

    2020  Band 8, Seite(n) 803

    Sprache Englisch
    Erscheinungsdatum 2020-08-04
    Erscheinungsland Switzerland
    Dokumenttyp Editorial
    ZDB-ID 2719493-0
    ISSN 2296-4185
    ISSN 2296-4185
    DOI 10.3389/fbioe.2020.00803
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  8. Artikel ; Online: Miniaturized Bioengineered Models for Preterm Fetal Membrane Healing.

    Famos, Flurina / Avilla-Royo, Eva / Vonzun, Ladina / Ochsenbein-Kölble, Nicole / Ehrbar, Martin

    Fetal diagnosis and therapy

    2022  Band 49, Heft 5-6, Seite(n) 235–244

    Abstract: Introduction: The reason for the absence of fetal membrane (FM) healing after a fetoscopic intervention is still unknown. We hypothesize that the lack of robust miniaturized models to study preterm FM functions is currently hampering the development of ... ...

    Abstract Introduction: The reason for the absence of fetal membrane (FM) healing after a fetoscopic intervention is still unknown. We hypothesize that the lack of robust miniaturized models to study preterm FM functions is currently hampering the development of new treatments for FM healing. Specifically, miniaturized models to study preterm FM healing with minimal amounts of tissue are currently lacking.
    Methods: In this study, we collected FMs from planned cesarean deliveries and developed different ex vivo models with an engineered biomaterial to study FM healing. Then, the effect of platelet-derived growth factor BB (PDGF-BB) on the migration of cells from preterm and term FMs was evaluated.
    Results: FMs could be viably cultured ex vivo for 14 days. In a model of punctured FMs, migration of cells into FM defects was less pronounced than migration out of the tissue into the biomaterial. In a miniaturized model of preterm cell migration, PDGF-BB promoted migration of preterm amnion cells into the biomaterial.
    Discussion and conclusion: By using a novel miniaturized model of preterm tissue, we here successfully demonstrate that PDGF-BB can promote preterm FM cell migration of microtissues encapsulated in a three-dimensional environment.
    Mesh-Begriff(e) Amnion ; Becaplermin/metabolism ; Biocompatible Materials/metabolism ; Extraembryonic Membranes/metabolism ; Female ; Fetal Membranes, Premature Rupture/metabolism ; Humans ; Infant, Newborn ; Pregnancy ; Wound Healing
    Chemische Substanzen Biocompatible Materials ; Becaplermin (1B56C968OA)
    Sprache Englisch
    Erscheinungsdatum 2022-06-16
    Erscheinungsland Switzerland
    Dokumenttyp Journal Article
    ZDB-ID 1066460-9
    ISSN 1421-9964 ; 1015-3837
    ISSN (online) 1421-9964
    ISSN 1015-3837
    DOI 10.1159/000525559
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  9. Artikel ; Online: Recovery of Therapeutically Ablated Engineered Blood-Vessel Networks on a Plug-and-Play Platform.

    Krattiger, Lisa A / Moser, Lukas O / Odabasi, Rodi / Odriozola, Adolfo / Simona, Benjamin R / Djonov, Valentin / Tibbitt, Mark W / Ehrbar, Martin

    Advanced healthcare materials

    2023  Band 13, Heft 4, Seite(n) e2301142

    Abstract: Limiting the availability of key angiogenesis-promoting factors is a successful strategy to ablate tumor-supplying blood vessels or to reduce excessive vasculature in diabetic retinopathy. However, the efficacy of such anti-angiogenic therapies (AATs) ... ...

    Abstract Limiting the availability of key angiogenesis-promoting factors is a successful strategy to ablate tumor-supplying blood vessels or to reduce excessive vasculature in diabetic retinopathy. However, the efficacy of such anti-angiogenic therapies (AATs) varies with tumor type, and regrowth of vessels is observed upon termination of treatment. The ability to understand and develop AATs remains limited by a lack of robust in vitro systems for modeling the recovery of vascular networks. Here, complex 3D micro-capillary networks are engineered by sequentially seeding human bone marrow-derived mesenchymal stromal cells and human umbilical vein endothelial cells (ECs) on a previously established, synthetic plug-and-play hydrogel platform. In the tightly interconnected vascular networks that form this way, the two cell types share a basement membrane-like layer and can be maintained for several days of co-culture. Pre-formed networks degrade in the presence of bevacizumab. Upon treatment termination, vessel structures grow back to their original positions after replenishment with new ECs, which also integrate into unperturbed established networks. The data suggest that this plug-and-play platform enables the screening of drugs with blood-vessel inhibiting functions. It is believed that this platform could be of particular interest in studying resistance or recovery mechanisms to AAT treatment.
    Mesh-Begriff(e) Humans ; Human Umbilical Vein Endothelial Cells ; Mesenchymal Stem Cells ; Coculture Techniques ; Hydrogels/pharmacology ; Neoplasms ; Neovascularization, Physiologic
    Chemische Substanzen Hydrogels
    Sprache Englisch
    Erscheinungsdatum 2023-11-27
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 2649576-4
    ISSN 2192-2659 ; 2192-2640
    ISSN (online) 2192-2659
    ISSN 2192-2640
    DOI 10.1002/adhm.202301142
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  10. Artikel ; Online: Raman spectroscopy analysis of human amniotic fluid cells from fetuses with myelomeningocele.

    Pontiggia, Luca / Michalak-Micka, Katarzyna / Hürlimann, Nadine / Yosef, Hesham K / Böni, Roland / Klar, Agnes S / Ehrbar, Martin / Ochsenbein-Kölble, Nicole / Biedermann, Thomas / Moehrlen, Ueli

    Experimental cell research

    2024  Band 439, Heft 1, Seite(n) 114048

    Abstract: Prenatal surgery for the treatment of spina bifida (myelomeningocele, MMC) significantly enhances the neurological prognosis of the patient. To ensure better protection of the spinal cord by large defects, the application of skin grafts produced with ... ...

    Abstract Prenatal surgery for the treatment of spina bifida (myelomeningocele, MMC) significantly enhances the neurological prognosis of the patient. To ensure better protection of the spinal cord by large defects, the application of skin grafts produced with cells gained from the amniotic fluid is presently studied. In order to determine the most appropriate cells for this purpose, we tried to shed light on the extremely complex amniotic fluid cellular composition in healthy and MMC pregnancies. We exploited the potential of micro-Raman spectroscopy to analyse and characterize human amniotic fluid cells in total and putative (cKit/CD117-positive) stem cells of fetuses with MMC in comparison with amniotic fluid cells from healthy individuals, human fetal dermal fibroblasts and adult adipose derived stem cells. We found that (i) the differences between healthy and MMC amniocytes can be attributed to specific spectral regions involving collagen, lipids, sugars, tryptophan, aspartate, glutamate, and carotenoids, (ii) MMC amniotic fluid contains two particular cell populations which are absent or reduced in normal pregnancies, (iii) the cKit-negative healthy amniocyte subpopulation shares molecular features with human fetal fibroblasts. On the one hand we demonstrate a different amniotic fluid cellular composition in healthy and MMC pregnancies, on the other our work confirms micro-Raman spectroscopy to be a valuable tool for discriminating cell populations in unknown mixtures of cells.
    Sprache Englisch
    Erscheinungsdatum 2024-05-01
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 1493-x
    ISSN 1090-2422 ; 0014-4827
    ISSN (online) 1090-2422
    ISSN 0014-4827
    DOI 10.1016/j.yexcr.2024.114048
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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