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Brembilla N, Modarressi A, André-Lévigne D, Vuagnat H, Durual S, Marger L, Boehncke W, Krause K, Preynat-Seauve O. LB1027 An adipose-derived stem cell-engineered patch represents a promising treatment for chronic wounds. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.05.1056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Durual S, Schaub L, Mekki M, Manoil D, Martinelli-Kläy CP, Sailer I, Scherrer SS, Marger L. Pre-Treat Xenogenic Collagenous Blocks of Bone Substitutes with Saline Facilitate Their Manipulation and Guarantee High Bone Regeneration Rates, Qualitatively and Quantitatively. Biomedicines 2021; 9:biomedicines9030308. [PMID: 33802656 PMCID: PMC8002590 DOI: 10.3390/biomedicines9030308] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 03/10/2021] [Accepted: 03/15/2021] [Indexed: 11/16/2022] Open
Abstract
Deproteinized bovine bone mineral particles embedded in collagen (DBBM-C) are widely used for bone regenerations with excellent, albeit sometimes variable clinical outcomes. Clinicians usually prepare DBBM-C by mixing with blood. Replacing blood by saline represents an alternative. We investigated if saline treatment could improve DBBM-C i. handling in vitro and ii. biological performances in a rabbit calvarial model. In vitro, DBBM-C blocks soaked in saline or blood were submitted to compression tests. In vivo, four poly ether ether ketone (PEEK)cylinders were placed on 16 rabbit skulls, filled with DBBM-C soaked in blood or saline for 2-4-8-12 weeks before histomorphometry. DBBM-C blocks were fully hydrated after 30 s in saline when 120 s in blood could not hydrate blocks core. Stiffness gradually decreased 2.5-fold after blood soaking whereas a six-fold decrease was measured after 30 s in saline. In vivo, saline treatment allowed 50% more bone regeneration during the first month when compared to blood soaking. This difference was then no longer visible. New bone morphology and maturity were equivalent in both conditions. DBBM-C saline-soaking facilitated its handling and accelerated bone regeneration of highly qualitative tissues when compared to blood treatment. Saline pretreatment thus may increase the clinical predictability of bone augmentation procedures.
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Affiliation(s)
- Stephane Durual
- Biomaterials Laboratory, Division of Fixed Prosthodontics and Biomaterials, University of Geneva, University Clinics of Dental Medicine, 1, rue Michel Servet, 1204 Geneva, Switzerland; (L.S.); (M.M.); (S.S.S.); (L.M.)
- Correspondence: ; Tel.: +41-22-379-40-93
| | - Leandra Schaub
- Biomaterials Laboratory, Division of Fixed Prosthodontics and Biomaterials, University of Geneva, University Clinics of Dental Medicine, 1, rue Michel Servet, 1204 Geneva, Switzerland; (L.S.); (M.M.); (S.S.S.); (L.M.)
| | - Mustapha Mekki
- Biomaterials Laboratory, Division of Fixed Prosthodontics and Biomaterials, University of Geneva, University Clinics of Dental Medicine, 1, rue Michel Servet, 1204 Geneva, Switzerland; (L.S.); (M.M.); (S.S.S.); (L.M.)
| | - Daniel Manoil
- Division of Oral Diseases, Department of Dental Medicine, Karolinska Institutet, 17177 Stockholm, Sweden;
| | - Carla P. Martinelli-Kläy
- Laboratory of Oral & Maxillofacial Pathology, Division of Oral and Maxillofacial Surgery (HUG), Department of Surgery, University of Geneva, University Clinics of Dental Medicine, 1, rue Michel Servet, 1204 Geneva, Switzerland;
| | - Irena Sailer
- Division of Fixed Prosthodontics and Biomaterials, University of Geneva, University Clinics of Dental Medicine, 1, rue Michel Servet, 1204 Geneva, Switzerland;
| | - Susanne S. Scherrer
- Biomaterials Laboratory, Division of Fixed Prosthodontics and Biomaterials, University of Geneva, University Clinics of Dental Medicine, 1, rue Michel Servet, 1204 Geneva, Switzerland; (L.S.); (M.M.); (S.S.S.); (L.M.)
| | - Laurine Marger
- Biomaterials Laboratory, Division of Fixed Prosthodontics and Biomaterials, University of Geneva, University Clinics of Dental Medicine, 1, rue Michel Servet, 1204 Geneva, Switzerland; (L.S.); (M.M.); (S.S.S.); (L.M.)
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Marger L, Schaub L, Strasding M, Sailer I, Durual S. Type H blood vessels, do they influence bone regeneration guided by bone substitutes? Clin Oral Implants Res 2019. [DOI: 10.1111/clr.73_13509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Lazzarotto B, Marger L, Mekki M, Ghuskasyan A, Barone A, Durual S. Effect of implant structured neck design on the behavior of peri‐implant soft tissue cells. Clin Oral Implants Res 2019. [DOI: 10.1111/clr.3_13509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Moussa M, Banakh O, Wehrle-Haller B, Fontana P, Scherrer S, Cattani M, Wiskott A, Durual S. TiN x O y coatings facilitate the initial adhesion of osteoblasts to create a suitable environment for their proliferation and the recruitment of endothelial cells. ACTA ACUST UNITED AC 2017; 12:025001. [PMID: 28244429 DOI: 10.1088/1748-605x/aa57a7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Titanium-nitride-oxide coatings (TiN x O y ) improve osseointegration of endosseous implants. The exact mechanisms by which these effects are mediated are poorly understood except for an increase of osteoblast proliferation while a high degree of differentiation is maintained. One hypothesis holds that TiN x O y facilitates the initial spreading and adhesion of the osteoblasts. The aim of this work was to investigate the molecular mechanisms of osteoblast adhesion on TiN x O y as compared to microrough titanium SLA. A global view of the osseointegrative process, that is, taking into account other cell groups, especially endothelial cells, is also presented. To this aim, gene expression and focal adhesion analysis, cocultures and wound assays were performed early after seeding, from 6 h to 3 days. We demonstrated that TiN x O y coatings enhance osteoblast adhesion and spreading when compared to the standard microrough titanium. The integrin β1, either in association with α1 or with α2 plays a central role in these mechanisms. TiN x O y coatings optimize the process of osseointegration by acting at several levels, especially by upregulating osteoblast adhesion and proliferation, but also by supporting neovascularization and the development of a suitable inflammatory environment.
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Affiliation(s)
- M Moussa
- Division of fixed prosthodontics and biomaterials, University clinics of dental medicine, University of Geneva, Switzerland
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Cattani-Lorente M, Scherrer S, Durual S, Sanon C, Douillard T, Gremillard L, Chevalier J, Wiskott A. Effect of different surface treatments on the hydrothermal degradation of a 3Y-TZP ceramic for dental implants. Dent Mater 2014; 30:1136-46. [DOI: 10.1016/j.dental.2014.07.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Revised: 05/20/2014] [Accepted: 07/09/2014] [Indexed: 02/04/2023]
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Durual S, Pernet F, Rieder P, Mekki M, Cattani-Lorente M, Wiskott HWA. Titanium nitride oxide coating on rough titanium stimulates the proliferation of human primary osteoblasts. Clin Oral Implants Res 2010; 22:552-9. [PMID: 21087318 DOI: 10.1111/j.1600-0501.2010.02033.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVES Titanium is widely used in contemporary endosseous implantology and there is considerable thrust to further promote osseointegration by implant surface modifications. The aim of this study was to evaluate the effect of a titanium-nitride-oxide (TiNOx) coating on commercially pure microroughened titanium by assessing the proliferation and differentiation of human primary osteoblasts. MATERIALS AND METHODS Cell proliferation, gene expression, alkaline phosphatase activity, osteoprotegerin and osteocalcin secretion were analyzed for a time course of 3 weeks, with or without additional stimulation by 1.25(OH)(2) vitamin D(3) 100 nM. RESULTS A 1.5-fold increase in the proliferation rate of cells grown on TiNOx-coated titanium as compared with uncoated surfaces was observed. SEM views indicated that the cells' normal morphology with their numerous extensions was maintained. The differentiation process on the TiNOx surface was only affected to a minor degree and translated into a slight delay in osteoblast maturation when compared to uncoated titanium. CONCLUSION Pending confirmation of these results in vivo, TiNOx coatings could potentially accelerate and enhance osseointegration.
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Affiliation(s)
- S Durual
- Laboratory of Biomaterials, University of Geneva, Switzerland.
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Ramirez JM, Schaad O, Durual S, Cossali D, Docquier M, Beris P, Descombes P, Matthes T. Growth differentiation factor 15 production is necessary for normal erythroid differentiation and is increased in refractory anaemia with ring-sideroblasts. Br J Haematol 2008; 144:251-62. [PMID: 19036111 DOI: 10.1111/j.1365-2141.2008.07441.x] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The disturbed erythropoiesis in patients with refractory anaemia with ring-sideroblasts (RARS) is characterized by intramedullary apoptosis of erythroid precursors and increased iron accumulation in mitochondria. To gain insight into these pathophysiological mechanisms we compared the gene expression profile (GEP) of erythroid precursors from RARS patients to the GEP of normal erythroid precursors. Three hundred sixty four probe sets were up-, and 253 probe sets downregulated in RARS cells. Interestingly, Growth Differentiation factor 15 (GDF15), a cytokine from the TGFbeta family, was dramatically upregulated in all RARS patients. Measurement of GDF15 in the sera from twenty RARS patients confirmed this finding by showing significantly, 7.2-fold, increased protein levels (3254 +/- 1400 ng/ml vs. 451 +/- 87 ng/ml in normals). In vitro studies demonstrated erythroid-specific production of GDF15 and dependence on erythropoietin. Induction of apoptosis by arsenic trioxide, a drug which acts via reduction of the mitochondrial membrane potential, also stimulated GDF15 production. Downregulation of endogenous GDF15 production in erythoblasts by specific siRNA led to diminished erythroid differentiation. Taken together, our findings demonstrate a new role for GDF15 in normal erythropoiesis as well as in the ineffective erythropoiesis of RARS patients.
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Affiliation(s)
- Jean-Marie Ramirez
- Division of Haematology, University Hospital Geneva, Geneva, Switzerland
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Durual S, Rideau A, Ruault-Jungblut S, Cossali D, Beris P, Piguet V, Matthes T. Lentiviral PU.1 overexpression restores differentiation in myeloid leukemic blasts. Leukemia 2007; 21:1050-9. [PMID: 17361223 DOI: 10.1038/sj.leu.2404645] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [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: 11/09/2022]
Abstract
PU.1, a transcription factor of the ETS family, plays a pivotal role in normal hematopoiesis, and particularly in myeloid differentiation. Altered PU.1 function is possibly implicated in leukemogenesis, as PU.1 gene mutations were identified in some patients with acute myeloid leukemia (AML) and as several oncogenic products (AML1-ETO, promyelocytic leukemia-retinoic acid receptor alpha, FMS-like receptor tyrosine kinase 3 internal tandem duplication) are associated with PU.1 downregulation. To demonstrate directly a role of PU.1 in the blocked differentiation of leukemic blasts, we transduced cells from myeloid cell lines and primary blasts from AML patients with a lentivector encoding PU.1. In NB4 cells we obtained increases in PU.1 mRNA and protein, comparable to increases obtained with all-trans retinoic acid-stimulation. Transduced cells showed increased myelomonocytic surface antigen expression, decreased proliferation rates and increased apoptosis. Similar results were obtained in primary AML blasts from 12 patients. These phenotypic changes are characteristic of restored blast differentiation. PU.1 should therefore constitute an interesting target for therapeutic intervention in AML.
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Affiliation(s)
- S Durual
- 1Division of Hematology, University Hospital Geneva, Geneva, Switzerland
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Moro F, Levenez F, Durual S, Plaisancié P, Thim L, Giraud AS, Cuber JC. Secretion of the trefoil factor TFF3 from the isolated vascularly perfused rat colon. Regul Pept 2001; 101:35-41. [PMID: 11495677 DOI: 10.1016/s0167-0115(01)00257-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [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
The trefoil factor TFF3 is a peptide predominantly produced by mucus-secreting cells in the small and large intestines. It has been implicated in intestinal protection and repair. The mechanisms that govern TFF3 secretion are poorly understood. The aim of this study was, therefore, to evaluate the influence of neurotransmitters, hormonal peptides and mediators of inflammation on the release of TFF3. For this purpose, an isolated vascularly perfused rat colon preparation was used. After a bolus administration of 1 ml isotonic saline into the lumen, TFF3 secretion was induced by a 30-min intra-arterial infusion of the compounds to be tested. TFF3 was evaluated in the luminal effluent using a newly developed radioimmunoassay. TFF3 was barely detected in crude luminal samples. In contrast, dithiothreitol (DTT) treatment of the effluent revealed TFF3 immunoreactivity, which amounted to about 0.3 pmol min(-1) cm(-1) in the basal state. Gel chromatography of DTT-treated luminal samples revealed a single peak that co-eluted with the monomeric form of TFF3. TFF3 was not detected in the portal effluent. Bethanechol (10(-6)-10(-4) M), vasoactive intestinal peptide (VIP, 10(-8)-10(-7) M) or bombesin (10(-8)-10(-7) M) induced a dose-dependent release of TFF3. In contrast, substance P evoked a modest release of TFF3, whereas calcitonin gene-related peptide (CGRP), somatostatin, neurotensin or peptide YY (PYY) did not modify TFF3 secretion. The degranulator compound bromolasalocid, 16,16-dimethyl PGE2 (dmPGE2) or interleukin-1-beta (IL-1-beta) also evoked a marked release of TFF3. In conclusion, TFF3 in the colonic effluent is present in a complex. This association presumably involves a disulfide bond. Additionally, the present results suggest a role for enteric nervous system and resident immune cells in mediation of colonic TFF3 secretion.
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Affiliation(s)
- F Moro
- Inserm Unité 45, Hôpital Edouard-Herriot, Pavillon Hbis, 69437 Cedex 03, Lyon, France
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