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https://www.readbyqxmd.com/read/28707582/the-modulation-of-micrornas-in-tooth-root-development
#1
Ran Zhang, Tiejun Li
Tooth root development begins after the completion of tooth crown development, both of them undergo a series of interactions between epithelium and the adjacent mesenchymal cells. In contrast to the study in tooth crown formation, little is known about the regulatory mechanisms of tooth root development. MicroRNAs (miRNAs) are small non-coding RNAs that regulate protein expression through post-transcriptional mechanisms. They participate in a broad aspect of biological processes from the control of development to tumorigenesis...
July 13, 2017: Current Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28683410/different-expression-patterns-of-lin28-and-lin28b-in-mouse-molar-development
#2
Ning Dong, Yan Liu, Tiantian Zhang, Lin Zhao, Jiangang Tian, Jianping Ruan
OBJECTIVE: The RNA-binding proteins Lin28 and Lin28b are expressed in many developing tissues and are involved in the biosynthesis of the microRNA let-7 family and embryogenesis processes. However, their roles in mammalian tooth development remain ill-defined. DESIGN: The spatiotemporal expressions of Lin28 and Lin28b during mouse molar odontogenesis from day E11.5 to P21 were examined through immunohistochemistry and western blot analysis. RESULTS: Both Lin28 and Lin28b were initially expressed in dental epithelium, but the expression patterns varied thereafter...
June 23, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28678949/human-plasma-fibronectin-promotes-proliferation-and-differentiation-of-odontoblast
#3
Jia Tang, Takashi Saito
Objective: To assess the effect of fibronectin (Fn) and porcine type I collagen (PCOL) on odontoblast-like cells in vitro. Material and Methods: Rat odontoblast-like cells (MDPC-23 cells) were inoculated and cultured on Fn-coated or type I collagen-coated substrates. Proliferation assay, alkaline phosphatase activity (ALP activity), mRNA expression of hard tissue-forming markers, and Alizarin red staining were investigated over a period of 10 days. Results: Cells maintained a high proliferation activity on Fn and PCOL even at a low seeding concentration (0...
May 2017: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/28672895/role-of-transient-receptor-potential-channel-6-in-the-odontogenic-differentiation-of-human-dental-pulp-cells
#4
Xiaoting Yang, Zhi Song, Lingling Chen, Runfu Wang, Shuheng Huang, Wei Qin, Jia Guo, Zhengmei Lin
Pulp capping is a restorative technique employed in an attempt to maintain pulpal vitality and generate reparative dentin. Ca(2+) released from capping materials is suggested to promote reparative dentin formation. Transient receptor potential channel 6 (TRPC6) is a receptor-operated Ca2+ channel that serves an important role in Ca2+ influx in the majority of non-excitable cells, and influences the calcium signaling and cell respond. Therefore, the purpose of the present study was to gain an insight into the role of TRPC6 in the odontoblastic differentiation of human dental pulp cells (HDPCs)...
July 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28667765/the-effects-of-2-hydroxyethyl-methacrylate-on-matrix-metalloproteinases-2-and-9-in-human-pulp-cells-and-odontoblast-like-cells-in-vitro
#5
S Sun, G-L Wang, Y Huang, H Diwu, Y-C Luo, J Su, Y-H Xiao
AIM: To assess the effects of 2-hydroxyethyl methacrylate (HEMA) on proliferation and migration of human pulp cells, as well as on matrix metalloproteinase (MMP-2 and MMP-9) expression in human odontoblast-like cells, contributing to the goal of determining the relationship between resin materials and MMP activity in pulp-dentine complexes. METHODOLOGY: Dental pulp cell cultures were established from pulp tissue of human teeth extracted for orthodontic purposes...
July 1, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/28651921/ultrasound-enhances-dentoalveolar-remodeling-in-an-ex%C3%A2-vivo-orthodontic-ovariectomy-induced-osteoporotic-model
#6
Khuloud S Alhazmi, Tarek El-Bialy, Ahmed R Afify, Leena A Merdad, Ali H Hassan
The aim of the study was to investigate the effects of low-intensity pulsed ultrasound (LIPUS) on dentoalveolar structures during application of force to a cultured mandible slice taken from an ovariectomized rat model of osteoporosis. Rats were divided based on whether they had ovariectomy and/or LIPUS application into four groups: control osteoporosis group, control normal group, ultrasound-treated osteoporosis group and ultrasound-treated normal group. The mandibles were dissected, sliced and cultured before application of a 0...
June 23, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28643909/the-fate-of-osterix-expressing-mesenchymal-cells-in-dental-root-formation-and-maintenance
#7
A Takahashi, N Ono, W Ono
OBJECTIVES: Osterix (Osx)-expressing mesenchymal cells are progenitors for tooth root forming cells. The aim of this study was to reveal the fates of Osx-expressing cells during and after root formation using a lineage tracing experiment. MATERIAL AND METHODS: To reveal the fates of Osx-expressing dental mesenchymal progenitors, we took advantage of tamoxifen-inducible Cre reporter system. Osx-creER; R26R-tdTomato mice received tamoxifen (0.1 mg/body) at postnatal day 3 (P3)...
June 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28638345/heterogeneity-and-developmental-connections-between-cell-types-inhabiting-teeth
#8
REVIEW
Jan Krivanek, Igor Adameyko, Kaj Fried
Every tissue is composed of multiple cell types that are developmentally, evolutionary and functionally integrated into the unit we call an organ. Teeth, our organs for biting and mastication, are complex and made of many different cell types connected or disconnected in terms of their ontogeny. In general, epithelial and mesenchymal compartments represent the major framework of tooth formation. Thus, they give rise to the two most important matrix-producing populations: ameloblasts generating enamel and odontoblasts producing dentin...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28631175/orthodontic-force-application-upregulated-pain-associated-prostaglandin-i2-pgi2-receptor-trpv1-pathway-related-gene-expression-in-rat-molars
#9
Mariko Ohkura, Naoto Ohkura, Nagako Yoshiba, Kunihiko Yoshiba, Hiroko Ida-Yonemochi, Hayato Ohshima, Isao Saito, Takashi Okiji
This study aimed to analyze the mRNA expression and protein localization of prostaglandin I2 (PGI2) synthase (PGIS), the PGI2 receptor (IP receptor) and transient receptor potential cation channel, subfamily V, member 1 (TRPV1) in force-stimulated rat molars, toward the elucidation of the PGI2-IP receptor-TRPV1 pathway that is in operation in the pulp and possibly associated with orthodontic pain and inflammation. Experimental force was applied to the maxillary first and second molars by inserting an elastic band between them for 6-72 h...
June 19, 2017: Odontology
https://www.readbyqxmd.com/read/28608628/the-role-of-microrna-143-5p-in-the-differentiation-of-dental-pulp-stem-cells-into-odontoblasts-by-targeting-runx2-via-the-opg-rankl-signaling-pathway
#10
Fu-Liang Zhan, Xin-Yang Liu, Xing-Bo Wang
This study aims to elucidate the mechanisms by which microRNA-143-5p (miR-143-5p) targets runt-related transcription factor 2 (Runx2) in the differentiation of dental pulp stem cells (DPSCs) into odontoblasts, through regulating the osteoprotegerin receptor activator of the nuclear factor-κB ligand (OPG/RANKL) signaling pathway. Following transfection, DPSCs were divided into blank, control, miR-143-5p mimics, miR-143-5p inhibitors, miR-143-5p inhibitors + siRunx2 and siRunx2 groups. Alkaline phosphatase (ALP) activity and mineralized nodules were detected using ALP kit and alizarin red staining...
June 13, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28607361/a-novel-strategy-to-engineer-pre-vascularized-full-length-dental-pulp-like-tissue-constructs
#11
Avathamsa Athirasala, Fernanda Lins, Anthony Tahayeri, Monica Hinds, Anthony J Smith, Christine Sedgley, Jack Ferracane, Luiz E Bertassoni
The requirement for immediate vascularization of engineered dental pulp poses a major hurdle towards successful implementation of pulp regeneration as an effective therapeutic strategy for root canal therapy, especially in adult teeth. Here, we demonstrate a novel strategy to engineer pre-vascularized, cell-laden hydrogel pulp-like tissue constructs in full-length root canals for dental pulp regeneration. We utilized gelatin methacryloyl (GelMA) hydrogels with tunable physical and mechanical properties to determine the microenvironmental conditions (microstructure, degradation, swelling and elastic modulus) that enhanced viability, spreading and proliferation of encapsulated odontoblast-like cells (OD21), and the formation of endothelial monolayers by endothelial colony forming cells (ECFCs)...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28602264/head-and-neck-radiotherapy-does-not-increase-gelatinase-metalloproteinase-2-and-9-expression-or-activity-in-teeth-irradiated-in%C3%A2-vivo
#12
Wagner Gomes-Silva, Ana Carolina Prado Ribeiro, Gilberto de Castro Junior, João Victor Salvajoli, Natalia Rangel Palmier, Marcio Ajudarte Lopes, Marcelo Marques Rocha, Mario Fernando de Goes, Thais Bianca Brandão, Alan Roger Santos-Silva
OBJECTIVE: Recent studies suggested that head and neck radiotherapy increases active forms of matrix metalloproteinases (MMPs) in the dentin-enamel junction (DEJ), leading to enamel delamination and radiation-related caries. This study aimed to assess the expression and activity of the gelatinases MMP-2 and MMP-9 in the DEJ and dentin-pulp complex tissues of teeth irradiated in vivo. STUDY DESIGN: Thirty-six teeth were studied, including 19 irradiated and 17 non-irradiated controls...
April 25, 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/28596530/axin2-expressing-cells-differentiate-into-reparative-odontoblasts-via-autocrine-wnt-%C3%AE-catenin-signaling-in-response-to-tooth-damage
#13
Rebecca Babb, Dhivya Chandrasekaran, Vitor Carvalho Moreno Neves, Paul T Sharpe
In non-growing teeth, such as mouse and human molars, primary odontoblasts are long-lived post-mitotic cells that secrete dentine throughout the life of the tooth. New odontoblast-like cells are only produced in response to a damage or trauma. Little is known about the molecular events that initiate mesenchymal stem cells to proliferate and differentiate into odontoblast-like cells in response to dentine damage. The reparative and regenerative capacity of multiple mammalian tissues depends on the activation of Wnt/β-catenin signaling pathway...
June 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28595095/differential-expression-between-dsp-only-and-dsp-pp523-transcripts-in-rat-molar-teeth
#14
Ya-Qin Zhu, Ryan M Song, Helena H Ritchie
OBJECTIVE: To compare the expression patterns of two multiple transcripts derived from DSP-PP gene during tooth development. One is DSP-only transcript (i.e. does not encode PP) and the other is DSP-PP523 transcript, a main DSP-PP transcript. DESIGN: Unique antisense and sense riboprobes were generated from DSP-only and DSPPP523 cDNAs for in situ studies to examine DSP-only and DSP-PP523 transcript expression in developing molars. Paraffin-embedded sections (5-7μ m) from embryonic 20day, postnatal 2, 3 and 6days were deparaffined and hydrated...
May 31, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28568134/lysyl-oxidase-mediated-vegf-induced-differentiation-and-angiogenesis-in-human-dental-pulp-cells
#15
W J Bae, J K Yi, J Park, S K Kang, J H Jang, E C Kim
AIM: To investigate the effects of recombinant human vascular endothelial growth factor (rhVEGF) on odontoblastic differentiation, in vitro angiogenesis, and expression and activity of lysyl oxidase (LOX) in human dental pulp cells (HDPCs), compared with rhFGF-2. To identify the underlying molecular mechanisms, the study focused on whether LOX was responsible for the actions of rhVEGF. METHODOLOGY: rhVEGF was constructed using the pBAD-HisA plasmid in Escherichia coli...
June 1, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/28547659/quiescent-adult-stem-cells-in-murine-teeth-are-regulated-by-shh-signaling
#16
Yuko Ishikawa, Mitsushiro Nakatomi, Hiroko Ida-Yonemochi, Hayato Ohshima
The mechanisms regulating the maintenance of quiescent adult stem cells in teeth remain to be fully elucidated. Our aim is to clarify the relationship between BrdU label-retaining cells (LRCs) and sonic hedgehog (Shh) signaling in murine teeth. After prenatal BrdU labeling, mouse pups were analyzed during postnatal day 1 (P1) to week 5 (P5W). Paraffin sections were processed for immunohistochemistry for BrdU, Sox2, Gli1, Shh, Patched1 (Ptch1) and Ki67 and for in situ hybridization for Shh and Ptch1. Dense LRCs, Gli1-(+) cells and Ptch1-(+) cells were co-localized in the outer enamel epithelium of the apical bud and apical dental papilla of incisors...
May 26, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28544201/influence-of-highly-porous-electrospun-plga-pcl-nha-fibrous-scaffolds-on-the-differentiation-of-tooth-bud-cells-in-vitro
#17
Xinjie Cai, Sofie Ten Hoopen, Weibo Zhang, Charles Yi, Wanxun Yang, Fang Yang, John A Jansen, X Frank Walboomers, Pamela C Yelick
In this study, we investigated the use of three-dimensional electrospun poly(lactic-co-glycolic acid)/poly(ε-caprolactone) (PLGA/PCL) scaffolds seeded and cultured with postnatal dental cells, for improved dental tissue regeneration. Wet-electrospinning combined with ultrasonic treatment was studied as a method to enhance scaffold porosity and to promote cell-cell interactions. We also investigated whether nano-hydroxyapatite (nHA) incorporation could enhance dental cell differentiation. All scaffolds were seeded with human tooth pulp-derived dental mesenchymal (hDM) cells, or a combination of hDM and pig dental epithelial (pDE) cells, cultured for up to 28 days...
May 24, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28537502/suitability-of-different-natural-and-synthetic-biomaterials-for-dental-pulp-tissue-engineering
#18
Kerstin M Galler, Ferdinand Brandl, Susanne Kirchhof, Matthias Widbiller, Andreas Eidt, Wolfgang Buchalla, Achim Goepferich, Gottfried Schmalz
Dental pulp tissue engineering is possible after insertion of pulpal stem cells combined with a scaffold into empty root canals. Commonly used biomaterials are collagen or poly(lactic) acid, which are either difficult to modify or to insert into such a narrow space. New hydrogel scaffolds with bioactive, specifically tailored functions could optimize the conditions to engineer dental pulp. Different synthetic and natural hydrogels were tested for their suitability to engineer dental pulp. Two functionalized modifications of polyethylene glycol were developed in this study and compared to a self-assembling peptide as well as to collagen and fibrin...
May 24, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28530472/telomerase-expression-in-medaka-oryzias-melastigma-pharyngeal-teeth
#19
W H Tan, P E Witten, C Winkler, D W T Au, A Huysseune
Nonmammalian vertebrates have the capacity of lifelong tooth replacement. In all vertebrates, tooth formation requires contact and interaction between the oral or pharyngeal epithelium and the underlying mesenchyme. To secure lifelong replacement, the presence of odontogenic stem cells has been postulated, particularly in the epithelial compartment. This study uses an advanced teleost fish species, the marine medaka Oryzias melastigma, a close relative to Oryzias latipes, to examine the expression and distribution of telomerase reverse transcriptase (Tert), the catalytic unit of telomerase, in developing pharyngeal teeth and to relate these data to the proliferative activity of the cells...
June 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28513613/defects-in-the-acid-phosphatase-acpt-cause-recessive-hypoplastic-amelogenesis-imperfecta
#20
Claire El Smith, Laura LE Whitehouse, James A Poulter, Steven J Brookes, Peter F Day, Francesca Soldani, Jennifer Kirkham, Chris F Inglehearn, Alan J Mighell
We identified two homozygous missense variants (c.428C>T, p.(T143M) and c.746C>T, p.(P249L)) in ACPT, the gene encoding acid phosphatase, testicular, which segregates with hypoplastic amelogenesis imperfecta in two unrelated families. ACPT is reported to play a role in odontoblast differentiation and mineralisation by supplying phosphate during dentine formation. Analysis by computerised tomography and scanning electron microscopy of a primary molar tooth from an individual homozygous for the c.746C>T variant revealed an enamel layer that was hypoplastic, but mineralised with prismatic architecture...
August 2017: European Journal of Human Genetics: EJHG
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