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Fernanda V Ribeiro, Marcio Z Casati, Renato C Casarin, Mônica G Corrêa, Fabiano R Cirano, Brenno M Negri, Suzana P Pimentel
BACKGROUND: This study evaluated the influence of a triclosan-containing toothpaste in the profile of osteo-immunoinflammatory mediators in peri-implant crevicular fluid (PICF) and in clinical parameters during progression of peri-implant mucositis. METHODS: Twenty-two clinically healthy patients with an implant-supported single-unit crown were enrolled in this double-blind, randomized, crossover study carried out in two phases of 21 days each. During an experimental 3-week period of undisturbed plaque accumulation in the implants, patients were randomly assigned to use three times/day: triclosan (n = 11), triclosan/copolymer/fluoride toothpaste; or placebo (n = 11), fluoride toothpaste...
February 2018: Journal of Periodontology
Mandy Quade, Matthias Schumacher, Anne Bernhardt, Anja Lode, Marian Kampschulte, Andrea Voß, Paul Simon, Ortrud Uckermann, Matthias Kirsch, Michael Gelinsky
The present study describes the development and characterization of strontium(II)-modified biomimetic scaffolds based on mineralized collagen type I as potential biomaterial for the local treatment of defects in systemically impaired (e.g. osteoporotic) bone. In contrast to already described collagen/hydroxyapatite nanocomposites calcium was substituted with strontium to the extent of 25, 50, 75 and 100mol% by substituting the CaCl2 -stock solution (0.1M) with SrCl2 (0.1M) during the scaffold synthesis. Simultaneous fibrillation and mineralization of collagen led to the formation of collagen-mineral nanocomposites with mineral phases shifting from nanocrystalline hydroxyapatite (Sr0) over poorly crystalline Sr-rich phases towards a mixed mineral phase (Sr100), consisting of an amorphous strontium phosphate (identified as Collin's salt, Sr6 H3 (PO4 )5 ∗2 H2 O, CS) and highly crystalline strontium hydroxyapatite (Sr5 (PO4 )3 OH, SrHA)...
March 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Firas Awaja, Giorgio Speranza, Heike Kaltenegger, Débora Coraça-Huber, Birgit Lohberger
Osteo-integration and tissue regeneration are vital for the longevity, durability, and unremitting functionality of medical implants/scaffolds implanted in vivo. It's essential for biomaterials used for in vivo implantation to induce the cellular secretion of growth factors, necessary for the desired tissue generation, since the administration of artificial growth factors, in vivo, is largely prohibited. Plasma functionalized (N2 and O2 ) and stabilized Graphene Oxide (GO) thin layers in a hybrid with amorphous carbon (aC) induced the expression of vascular endothelial growth factor (VEGF) and osteoprotegerin (OPG) growth factors in fibroblasts (hGF) and, more remarkably, in osteoblasts (hFOB) cells confirming the suitability for tissue regeneration and osteo-integration applications...
March 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Hao Zhang, Zhong-Li Li, Xiang-Zheng Su, Li Ding, Ji Li, Heng Zhu
Rabbit mesenchymal stem cells (MSCs) are important seed cells in regenerative medicine research, particularly in translational research. In the current study, we showed that rabbit subchondral bone is a reliable source of MSCs. First, we harvested subchondral bone (SCB) from the rabbit knee-joint and initiated the MSC culture by cultivating enzyme-treated SCB. Adherent fibroblast-like cells that outgrew from SCB fulfill the common immuno-phenotypic criteria for defining MSCs, but with low contamination of CD45+ hematopoietic cells...
March 8, 2018: Experimental Animals
J Bi, Y Liu, X M Liu, L M Jiang, X Chen
AIM: To investigate the antibacterial activity of a novel intracanal medicament, iRoot FM, against Porphyromonas endodontalis (P. endodontalis) and its effects on the proliferation and osteo-/odontogenic differentiation of stem cells from apical papilla (SCAP). METHODOLOGY: The agar diffusion test was used to compare the antimicrobial efficacy of iRoot FM with two traditional intracanal medicaments, calcium hydroxide [Ca(OH)2 ] and triple antibiotic paste (TAP)...
March 7, 2018: International Endodontic Journal
D Henrich, C Seebach, R Verboket, A Schaible, I Marzi, H Bonig
Bone marrow mononuclear cells (BMC) seeded on a scaffold of β-tricalcium phosphate (β-TCP) promote bone healing in a critical-size femur defect model. Being BMC a mixed population of predominantly mature haematopoietic cells, which cell type(s) is(are) instrumental for healing remains elusive. Although clinical therapies using BMC are often dubbed as stem cell therapies, whether stem cells are relevant for the therapeutic effects is unclear and, at least in the context of bone repair, seems dubious. Instead, in light of the critical contribution of monocytes and macrophages to tissue development, homeostasis and injury repair, in the current study it was hypothesised that BMC-mediated bone healing derived from the stem cell population...
March 6, 2018: European Cells & Materials
Victor Charoenrook, Ralph Michael, Maria Fideliz de la Paz, José Temprano, Rafael I Barraquer
PURPOSE: To compare the anatomical and the functional results between osteo-odonto-keratoprosthesis (OOKP) and keratoprosthesis using tibial bone autograft (Tibial bone KPro). METHODS: We reviewed the charts of 258 patients; 145 had OOKP whereas 113 had Tibial bone KPro implanted. Functional success was defined as best corrected visual acuity ≥0.05 on decimal scale and anatomical success as retention of the keratoprosthesis lamina. Kaplan-Meier survival curves were calculated for anatomical and functional survival as well as to estimate the probability of post-op complications...
February 28, 2018: Ocular Surface
Irene Mencía Castaño, Caroline M Curtin, Garry Paul Duffy, Fergal J O'Brien
MicroRNA (miRNA) therapeutics are increasingly being developed to either target bone-related diseases such as osteoporosis and osteoarthritis or as the basis for novel bone tissue engineering strategies. A number of miRNAs have been reported as potential osteo-therapeutics but no consensus has yet been established on the optimal target. miR-16 has been studied extensively in non-osteogenic functions and used as functionality reporter target in the development of non-viral microRNA delivery platforms. This study hypothesised that miR-16 may also play an inhibitory role in osteogenesis due to its ability to directly target Smad5 & AcvR2a...
February 28, 2018: Tissue Engineering. Part A
Jaime Castro-Núñez
Based on previous findings, the author introduces the term "sugosteogenesis," a biological phenomenon that occurs by using the Evocyst, a device that exerts active intracystic negative pressure. The term "sugosteogenesis" comes from the Latin word "sugo-," meaning "suck," and Greek words "osteo-," meaning "bone," and genesis, "origin."
February 23, 2018: Journal of Craniofacial Surgery
Yao Liu, Huan Jing, Xiaoxing Kou, Chider Chen, Dawei Liu, Yan Jin, Li Lu, Songtao Shi
Programmed cell death-1 (PD-1) belongs to an inhibitory signaling pathway capable of maintaining central and peripheral immune tolerance. Blockage of PD-1 has been identified as a promising immunotherapeutic approach for cancer and chronic infectious diseases. However, it is unknown whether PD-1 pathway regulates stem cell function. It is generally believed that mesenchymal stem cells (MSCs) produce PD-1 ligand, but fail to express PD-1. In this study, we show that neural crest-derived MSCs from dental pulp (MSC-DP), but not MSCs from bone marrow, expressed PD-1...
February 22, 2018: Cell Death and Differentiation
Mi Zhou, Nan-Xin Liu, Si-Rong Shi, Yong Li, Qi Zhang, Quan-Quan Ma, Tao-Ran Tian, Wen-Juan Ma, Xiao-Xiao Cai, Yun-Feng Lin
Dental pulp stem cells (DPSCs) derived from the human dental pulp tissue have multiple differentiation capabilities, such as osteo/odontogenic differentiation. Therefore, DPSCs are deemed as ideal stem cell sources for tissue regeneration. As new nanomaterials based on DNA, tetrahedral DNA nanostructures (TDNs) have tremendous potential for biomedical applications. Here, the authors aimed to explore the part played by TDNs in proliferation and osteo/odontogenic differentiation of DPSCs, and attempted to investigate if these cellular responses could be driven by activating the canonical Notch signaling pathway...
February 16, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
Long Bai, Zhibin Du, Jingjing Du, Wei Yao, Jiaming Zhang, Zeming Weng, Si Liu, Ya Zhao, Yanlian Liu, Xiangyu Zhang, Xiaobo Huang, Xiaohong Yao, Ross Crawford, Ruiqiang Hang, Di Huang, Bin Tang, Yin Xiao
A multifaceted coating for hard tissue implants, with favorable osteogenesis, angiogenesis, and osteoimmunomodulation abilities, would be of great value since it could improve osseointegration and alleviate prosthesis loosening. However, to date there are few coatings that fully satisfy these criteria. Herein we describe a microporous TiO 2 coating decorated with hydroxyapatite (HA) nanoparticles that is generated by micro-arc oxidation of pure titanium (Ti) and followed annealing. By altering the annealing temperature, it is possible to simultaneously tune the coating's physical (morphology and wettability) and chemical (composites and crystallinity) properties...
February 6, 2018: Biomaterials
Zuyuan Luo, Siqi Zhang, Jijia Pan, Rui Shi, Hao Liu, Yalin Lyu, Xiao Han, Yan Li, Yue Yang, Zhixiu Xu, Yi Sui, En Luo, Yuanyuan Zhang, Shicheng Wei
The efficacy of stem cell-based bone tissue engineering has been hampered by cell death and limited fate control. A smart cell culture system with the capability of sequentially delivering multiple factors in specific growth stages, like the mechanism of the natural extracellular matrix modulating tissue formation, is attractive for enhancing cell activity and controlling cell fate. Here, a bone forming peptide-1 (BFP-1)-laden mesoporous silica nanoparticles (pep@MSNs) incorporated adhesion peptide, containing the arginine-glycine-aspartic acid (RGD) domain, modified alginate hydrogel (RA) system (pep@MSNs-RA) was developed to promote the activity and stimulate osteo-differentiation of human mesenchymal stem cells (hMSCs) in sequence...
February 10, 2018: Biomaterials
Mark McCully, João Conde, Pedro V Baptista, Margaret Mullin, Matthew J Dalby, Catherine C Berry
Mesenchymal stem cells are multipotent adult stem cells capable of generating bone, cartilage and fat, and are thus currently being exploited for regenerative medicine. When considering osteogenesis, developments have been made with regards to chemical induction (e.g. differentiation media) and physical induction (e.g. material stiffness, nanotopography), targeting established early transcription factors or regulators such as runx2 or bone morphogenic proteins and promoting increased numbers of cells committing to osteo-specific differentiation...
2018: PloS One
Nejla B Erdal, Minna Hakkarainen
Bioactive and reinforced poly(ε-caprolactone) (PCL) films were constructed by incorporation of cellulose derived reduced nano-graphene oxide (r-nGO) carbon nanodots. Two different microwave-assisted reduction routes in superheated water were utilized to obtain r-nGO and r-nGO-CA. For the latter a green reducing agent, caffeic acid (CA) was incorporated in the reduction process. The materials were extruded and compression molded to obtain proper dispersion of the carbon nanodots in the polymer matrix. FTIR results revealed favorable interactions between r-nGO-CA and PCL that improved the dispersion of r-nGO-CA...
February 13, 2018: Biomacromolecules
He Wang, Dandan Ma, Xiaoyi Zhang, Shuaimei Xu, Tingting Ning, Buling Wu
OBJECTIVE: This study aimed to compare the proteomic profiling of human dental pulp stem cells (DPSCs) and periodontal ligament stem cells (PDLSCs) under in vitro osteogenic induction, which imitates the microenvironment during osteo-/odontogenesis of DPSCs and PDLSCs. DESIGN: The proteomic profiles of osteoinduced DPSCs and PDLSCs from a single donor were compared using the isobaric tag for relative and absolute quantitation (iTRAQ) technique and subsequent bioinformatics analysis...
February 3, 2018: Archives of Oral Biology
Mai Mochizuki, Taka Nakahara
BACKGROUND: Currently, ex-vivo handling of stem cells, including transport after harvest and therapeutic preparation, is generally done in culture media containing fetal bovine serum (FBS), which promotes cell attachment, proliferation, and differentiation. However, because of safety concerns associated with the use of FBS, including potential transmission of zoonotic agents and transplant rejection because of the incorporation of foreign proteins into the stem cells, there is a need for xenogeneic serum-free culture media for clinical handling of stem cells...
February 3, 2018: Stem Cell Research & Therapy
Jingyuan Li, Ling Song, Meng Hou, Ping Wang, Lingling Wei, Hui Song
Stem cell‑based therapies are promising strategies to stimulate bone regeneration. Carbon monoxide releasing molecule‑3 (CORM‑3) exhibits multiple regulatory effects in a number of cells by releasing carbon monoxide (CO). The present study aimed to investigate the influence of CORM‑3 on the osteogenic differentiation of rat bone marrow mesenchymal stem cells (BMSCs). BMSCs were divided into five groups: A CORM‑3‑osteogenic group, in which cells were pretreated with CORM‑3 and subjected to osteogenic differentiation induction using osteogenic medium; an osteogenic group, in which cells were cultured in osteogenic medium; a degassed CORM‑3‑osteogenic group, in which cells were pretreated with degassed CORM‑3 and subjected to osteogenic differentiation induction; a CORM‑3 group, in which cells were cultured in control medium containing CORM‑3; and a control group, in which cells were cultured in control medium alone...
January 29, 2018: International Journal of Molecular Medicine
Werner E G Müller, Meik Neufurth, Shunfeng Wang, Maximilian Ackermann, Rafael Muñoz-Espí, Qingling Feng, Qiang Lu, Heinz C Schröder, Xiaohong Wang
Using femur explants from mice as an in vitro model, we investigated the effect of the physiological polymer, inorganic polyphosphate (polyP), on differentiation of the cells of the bone marrow in their natural microenvironment into the osteogenic and chondrogenic lineages. In the form of amorphous Ca-polyP nano/microparticles, polyP retains its function to act as both an intra- and extracellular metabolic fuel and a stimulus eliciting morphogenetic signals. The method for synthesis of the nano/microparticles with the polyanionic polyP also allowed the fabrication of hybrid particles with the bisphosphonate zoledronic acid, a drug used in therapy of bone metastases in cancer patients...
January 31, 2018: International Journal of Molecular Sciences
Ryuma Haraguchi, Riko Kitazawa, Yuuki Imai, Sohei Kitazawa
Longitudinal bone growth progresses by continuous bone replacement of epiphyseal cartilaginous tissue, known as "growth plate", produced by columnar proliferated- and differentiated-epiphyseal chondrocytes. The endochondral ossification process at the growth plate is governed by paracrine signals secreted from terminally differentiated chondrocytes (hypertrophic chondrocytes), and hedgehog signaling is one of the best known regulatory signaling pathways in this process. Here, to investigate the developmental relationship between longitudinal endochondral bone formation and osteogenic progenitors under the influence of hedgehog signaling at the growth plate, genetic lineage tracing was carried out with the use of Gli1CreERT2 mice line to follow the fate of hedgehog-signal-responsive cells during endochondral bone formation...
January 22, 2018: Histochemistry and Cell Biology
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