Página 1 dos resultados de 1427 itens digitais encontrados em 0.006 segundos

Expression of Extracellular Matrix Proteins in Human Dental Pulp Stem Cells Depends on the Donor Tooth Conditions

MIYAGI, Sueli Patricia Harumi; KERKIS, Irina; MARANDUBA, Carlos Magno da Costa; GOMES, Cicera Maria; MARTINS, Manoela Domingues; MARQUES, Marcia Martins
Fonte: ELSEVIER SCIENCE INC Publicador: ELSEVIER SCIENCE INC
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.7%
Introduction: Stem cells are characterized by the ability to renew themselves through mitotic cell division and differentiating into a diverse range of specialized cell types. An important source of adult stem cells is the dental pulp. In dentistry, regenerative strategies are of importance because of hard dental tissue damage especially as result of caries lesions, trauma, or iatrogenic procedures. The regeneration of dental tissues relies on the ability of stem cells to produce extracellular (ECM) proteins encountered in the dental pulp tissue. Thus, the aim of this study was to analyze the expression and distribution of proteins encountered in dental pulp ECM (type I collagen, fibronectin, and tenascin) in stem cells. Methods: Human immature dental pulp stem cells (hIDPSCs) from deciduous (DL-1 and DL-4 cell lines) and permanent (DL-2) teeth were used. The distribution of ECM proteins was observed using the immunofluorescence technique. The gene expression profile was evaluated using reverse transcription polymerase chain reaction (RT-PCR) analysis. Results: Positive reactions for all ECM proteins were observed independently of the hIDPSCs analyzed. Type I collagen appeared less evident in DL-2 than in other hIDPSCs. Fibronectin and tenascin were less clear in DL-4. The RT-PCR reactions showed that type I collagen was lesser expressed in the DL-2 cells...

Diabetes induces metabolic alterations in dental pulp

LEITE, Mariana Ferreira; GANZERLA, Emily; MARQUES, Marcia Martins; NICOLAU, Jose
Fonte: ELSEVIER SCIENCE INC Publicador: ELSEVIER SCIENCE INC
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.74%
Diabetes can interfere in tissue nutrition and can impair dental pulp metabolism. This disease causes oxidative stress in cells and tissues. However, little is known about the antioxidant system in the dental pulp of diabetics. Thus, it would be of importance to study this system in this tissue in order to verify possible alterations indicative of oxidative stress. The aim of this study was to evaluate some parameters of antioxidant system of the dental pulp of healthy (n = 8) and diabetic rats (n = 8). Diabetes was induced by streptozotocin in rats. Six weeks after diabetes induction, a pool of the dental pulp of the 4 incisors of each rat (healthy and diabetic) was used for the determination of total protein and sialic acid concentrations and catalase and peroxidase activities. Data were compared by a Student t test (p <= 0.05). Dental pulps from both groups presented similar total protein concentrations and peroxidase activity. Dental pulps of diabetic rats exhibited significantly lower free, conjugated, and total sialic acid concentrations than those of control tissues. Catalase activity in diabetic dental pulps was significantly enhanced in comparison with that of control pulps. The result of the present study is indicative of oxidative stress in the dental pulp caused by diabetes. The increase of catalase activity and the reduction of sialic acid could be resultant of reactive oxygen species production.; Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)

TNF-alpha Promotes an Odontoblastic Phenotype in Dental Pulp Cells

PAULA-SILVA, F. W. G.; GHOSH, A.; SILVA, L. A. B.; KAPILA, Y. L.
Fonte: SAGE PUBLICATIONS INC Publicador: SAGE PUBLICATIONS INC
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.67%
Dental pulp cells can differentiate toward an odontoblastic phenotype to produce reparative dentin beneath caries lesions. However, the mechanisms involved in pulp cell differentiation under pro-inflammatory stimuli have not been well-explored. Thus, we hypothesized that the pro-inflammatory cytokine tumor necrosis factor-alpha (TNF-alpha) could be a mediator involved in dental pulp cell differentiation toward an odontoblastic phenotype. We observed that TNF-alpha-challenged pulp cells exhibited increased mineralization and early and increased expression of dentin phosphoprotein (DPP), dentin sialoprotein (DSP), dentin matrix protein-1, and osteocalcin during a phase of reduced matrix metalloproteinase (MMP) expression. We investigated whether these events were related and found that p38, a mitogen-activated protein kinase, differentially regulated MMP-1 and DSP/DPP expression and mediated mineralization upon TNF-alpha treatment. These findings indicate that TNF-alpha stimulates differentiation of dental pulp cells toward an odontoblastic phenotype via p38, while negatively regulating MMP-1 expression.; CAPES Foundation Fellowship[0668/07-9]; [NIH-R01-13725]

Dental pulp stem cells express proteins involved in the local invasiveness of odontogenic myxoma

Miyagi, Sueli Patricia Harumi; Costa Maranduba, Carlos Magno do; Silva, Fernando de Sá; Marques, Marcia Martins
Fonte: SOCIEDADE BRASILEIRA DE PESQUISA ODONTOLOGICA; SAO PAULO Publicador: SOCIEDADE BRASILEIRA DE PESQUISA ODONTOLOGICA; SAO PAULO
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.69%
Little is known about the histogenesis of the odontogenic myxoma (OM). Dental pulp stem cells could be candidate precursors of OM because both OM and the dental pulp share the same embryological origin: the dental papilla. For the purpose of comparing OM and stem cells, this study analyzed the expression of two proteins related to OM invasiveness (MMP-2 and hyaluronic acid) in human immature dental pulp stern cells (hIDPSCs). Three lineages of hIDPSCs from deciduous and permanent teeth were used in this study. Immunofluorescence revealed positive reactions for MMP-2 and hyaluronic acid (HA) in all hIDPSCs. MMP-2 appeared as dots throughout the cytoplasm, whereas HA appeared either as diffuse and irregular dots or as short fibrils throughout the cytoplasm and outside the cell bodies. The gene expression profile of each cell lineage was evaluated using RT-PCR analysis, and HA was expressed more intensively than MMP-2. HA expression was similar among the three hIDPSCs lineages, whereas MMP-2 expression was higher in DL-1 than in the other cell lines. The expression of proteins related to OM invasiveness in hIDPSCs could indicate that OM originates from dental pulp stem cells.; Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)...

Análise in vitro da expressão de proteínas da matriz extracelular (MEC) e de metaloproteinases da matriz (MMPs) em células-tronco adultas de polpa dentária humana; Analysis of ECM proteins and MMPs expression in human dental pulp stem cells

Miyagi, Sueli Patricia Harumi
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 16/04/2008 PT
Relevância na Pesquisa
66.69%
Células-tronco adultas podem ser isoladas de vários tecidos, dentre eles a polpa dentária humana, tecido originado na papila dentária do dente em desenvolvimento. Estas linhagens multipotentes podem ser estudadas sob vários aspectos, como na elucidação da histogênese de tumores. O objetivo deste estudo foi inferir a histogênese do mixoma odontogênico, neoplasia odontogênica benigna, analisando a expressão de proteínas da matriz extracelular (MEC) e de metaloproteinases da matriz (MMPs) em células-tronco adultas de polpa dentária humana. Três linhagens diferentes de células-tronco originadas de polpas dentárias humanas IDPSCs (DL-1, DL-2 e DL4) foram utilizadas. As proteínas analisadas foram as mesmas expressas na neoplasia: vimentina, colágeno tipo I, fibronectina, tenascina, ácido hialurônico e MMPs (MMP-1, MMP-2 e MMP-9). Imunofluorescência e ensaios enzimáticos foram utilizados para analisar a presença de proteínas nas células cultivadas e no meio de cultura condicionado por estas células, respectivamente. Todas as linhagens celulares expressaram a vimentina e nenhuma expressou o ácido hialurônico. A linhagem celular DL-1 expressou todas as outras proteínas da matriz extracelular estudadas, enquanto que na linhagem DL-2 apenas não foi observada a expressão do colágeno tipo I. Fibronectina e tenascina não foram observados na linhagem DL-4. Todas as linhagens expressaram todas as MMPs...

Reconstrução de defeitos ósseos cranianos em ratos com células-tronco de polpa dentária humana: estudo experimental de neoformação óssea; Reconstruction of cranial defects in rats with human dental pulp stem cells: experimental design of bone regeneration

Costa, André de Mendonça
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 15/12/2009 PT
Relevância na Pesquisa
66.71%
Os defeitos da calota craniana causados por traumas severos, neoplasias, cirurgias ou deformidades congênitas representam um grande desafio para os cirurgiões. O uso de enxertia óssea autóloga continua sendo o método de tratamento padrão ouro, embora apresente morbidade na área doadora e seja considerado insuficiente para reconstrução de grandes defeitos. Recentemente, com o advento da bioengenharia tecidual, novas expectativas surgiram na regeneração óssea. O objetivo deste estudo foi desenvolver um modelo experimental em ratos para o estudo de deformidades craniofaciais e verificar se as células-tronco humanas provenientes de dentes decíduos seriam capazes de regenerar defeitos críticos em calota craniana de ratos não imunossuprimidos. Foram realizados dois defeitos ósseos de espessura total com diâmetro de 5 x 8 mm na região biparietal. O lado esquerdo foi preenchido com membrana de colágeno, enquanto o lado direito com membrana de colágeno associada a células-tronco humanas provenientes de dentes decíduos. Essas células foram caracterizadas previamente in vitro como células mesenquimais. A eutanásia dos animais foi realizada no 7º, 21º, 30º e 60º dia de pós-operatório e amostras de tecido ósseo foram extraídas para realização da análise histológica. A análise da presença de células humanas no novo osso formado foi confirmada através do estudo molecular. A linhagem de células-tronco humanas provenientes de dentes decíduos foi positiva para células-tronco mesenquimais e sua diferenciação em tecido ósseo também foi evidenciada in vitro. Foi observada a formação óssea após 21 dias de cirurgia nos dois lados...

Estabelecimento e caracterização de células-tronco de polpa dentária de suínos; Establishment and characterization of stem cells from porcine dental pulp

Dias, João Leonardo Rodrigues Mendonça
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 21/12/2012 PT
Relevância na Pesquisa
66.78%
Os tecidos dentais apresentam-se como fontes abundantes e de fácil obtenção de células-tronco de diferentes tipos, como é o caso das células-tronco derivadas do epitélio dental, papila dental, ligamento periodontal e folículo dental que possuem origem ectomesenquimal oriundas da crista neural, com a exceção do epitélio dental que é oriundo do ectoderma. As células-tronco de polpa dentária humana (CTPD) expressam estavelmente marcadores de células-tronco adultas (CTA), CD105 e CD73 durante as passagens contínuas, e um grupo de antígenos estágios-específicos de superfície celular, SSEA-3, SSEA-4 e fatores de transcrição de células-tronco embrionárias (CTE) TRA1-60, TRA1-81, Oct-4 e Nanog. Além disso, estas células são capazes de se diferenciar in vitro em vários tipos de células e tecidos: cartilagem, osso, tecido neural, músculo liso e esquelético. Em suínos, modelo animal amplamente utilizado para o estudo de várias doenças encontradas em humanos, os dentes caninos possuem crescimento contínuo que pode ser uma característica bastante interessante quando pensamos em células-tronco. Dessa forma, o estudo das células de polpa dentária desse animal merece destaque. Neste trabalho visamos estabelecer o cultivo e a caracterização de células-tronco derivadas da polpa dentária dos dentes caninos dos suínos com crescimento contínuo (PDS) e dos dentes molares visando um estudo comparativo. O cultivo das células-tronco de polpa dentária de canino e molar foi estabelecido e de acordo com os nossos resultados podemos dizer que as células-tronco de polpa dentária de suíno são de fácil obtenção...

Células-tronco mesenquimais: isolamento e caracterização de populações derivadas de alvéolo dental humano e identificação e caracterização de populações de polpas dentais de camundongos; Mesenchymal stem cells: Isolation and characterization of populations derived from human dental alveolus and identification and characterization of populations from mouse dental pulp

Luiz, Lucyene Miguita
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 29/11/2013 PT
Relevância na Pesquisa
66.76%
Há um grande interesse no estudo de células-tronco em função de sua capacidade de auto-renovação e plasticidade. Estas características capacitam as células-tronco a produzirem células de diferentes linhagens que participam ativamente do processo de homeostase, da resposta à injúria e da regeneração e reparação tecidual. A polpa dental é o tecido mais estudado na Odontologia em relação a células-tronco, mas diversos estudos já mostraram a presença dessas células também na região periodontal. É importante salientar, que dependendo de sua origem, as células-tronco apresentam comportamentos diversos, especialmente no que tange ao transplante in vivo. Além disso, os microambientes onde as células-tronco residem (nichos), têm um papel fundamental no comportamento das mesmas, pois controlam aspectos essenciais como o estado de indiferenciação e a auto-renovação. Esse projeto de pesquisa teve como objetivos duas análises distintas. Na primeira, verificar se existem células-tronco mesenquimais derivadas da curetagem do alvéolo dental humano após extrações dentais. Na segunda, analisar o nicho de células-tronco nas polpas dentais de camundongos. Em comum, as duas análises se basearam no uso de marcadores previamente utilizados na literatura para o estudo de células-tronco. Como não existem marcadores únicos e específicos para a identificação dessas células...

Avaliação dos efeitos tradios da radioterapia na microcirculação pulpar: Taxa de %SpO2 pulpar de pacientes irradiados para tumores malignos intraorais e de orofaringe. Tese apresentada à Faculdade de Odontologia da Universidade de São Paulo para obtenção do título de Doutor em Ciências Odontológicas; Late effects evaluation of radiotherapy on dental pulp microcirculation: %SpO2 pulpal rate in patients given radiation therapy for malignant intraoral and oropharyngeal tumors

Kataoka, Simony Hidée Hamoy
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 14/08/2014 PT
Relevância na Pesquisa
66.74%
O objetivos deste estudo foi avaliar a influência da radiação ionizante na vitalidade do tecido pulpar mensurada através dos níveis de saturação de oxigênio (%SpO2) em pacientes com tumores malígnos intraoral ou de orofaringe, passado de 4-6 anos da radioterapia (RT). Noventa pacientes com tumores malígnos intraoral ou de orofaringe, submetidos de 4-6 anos anteriores a RT foram selecionados para este estudo. Os níveis de oxigenação e sensibilidade pulpar, avaliados através do oxímetro de pulso e do spray refrigerante TFE (tetrafluoretano), foram analisados nos dentes anteriores (superior e inferior) de cada paciente selecionado (n=693),, indiferente do quadrante e da área irradiada. Como grupo controle foram selecionados noventa pacientes saudáveis (nunca submetidos a RT) e os mesmos testes foram empregados (n=693). Todos os dentes foram considerados vitais. 100% mostraram resposta positva ao teste térmico e as médias de %SpO2 foram de 92.7% no grupo dos pacientes irradiados (SD ± 1.83) e 92.6% no grupo dos não-irradiados (SD ± 1.80), sem diferença estatística observada. Houve uma tendência de valores de %SpO2 menores em dentes caninos comparados aos incisivos, entretanto sem diferença estatística significante. Passados de 4-6 anos da RT...

Hypoxia Enhances the Angiogenic Potential of Human Dental Pulp Cells

Aranha, Andreza M. F.; Zhang, Zhaocheng; Neiva, Kathleen G.; Costa, Carlos A. S.; Hebling, Josimeri; Noer, Jacques E.
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 1633-1637
ENG
Relevância na Pesquisa
66.76%
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Introduction: Trauma can result in the severing of the dental pulp vessels, leading to hypoxia and ultimately to pulp necrosis. Improved understanding of mechanisms underlying the response of dental pulp cells to hypoxic conditions might lead to better therapeutic alternatives for patients with dental trauma. The purpose of this study was to evaluate the effect of hypoxia on the angiogenic response mediated by human dental pulp stem cells (DPSCs) and human dental pulp fibroblasts (HDPFs). Methods: DPSCs and HDPFs were exposed to experimental hypoxic conditions. Hypoxia-inducible transcription factor-1 alpha (HIF-1alpha) was evaluated by Western blot and immunocytochemistry, whereas vascular endothelial growth factor (VEGF) and basic fibroblast growth factor (bFGF) expression was evaluated by enzyme-linked immunosorbent assay. YC-1, an inhibitor of HIF-1alpha, was used to evaluate the functional effect of this transcriptional factor on hypoxia-induced VEGF expression. Conditioned medium from hypoxic and normoxic pulp cells was used to stimulate human dermal microvascular endothelial cells (HDMECs). HDMEC proliferation was measured by WST-1 assay, and angiogenic potential was evaluated by a capillary sprouting assay in 3-dimensional collagen matrices. Results: Hypoxia enhanced HIF-1alpha and VEGF expression in DPSCs and HDPFs. In contrast hypoxia did not induce bFGF expression in pulp cells. YC-1 partially inhibited hypoxia-induced HIF-1alpha and VEGF in these cells. The growth factor milieu of hypoxic HDPFs (but not hypoxic DPSCs) induced endothelial cell proliferation and sprouting as compared with medium from normoxic cells. Conclusions: Collectively...

Response of human dental pulp capped with MTA and calcium hydroxide powder

Accorinte, M. L. R.; Loguercio, Alessandro D.; Reis, Alessandra; Carneiro, E.; Grande, R. H. M.; Murata, S. S.; Holland, R.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 488-495
ENG
Relevância na Pesquisa
66.78%
Objectives: To compare the response of human dental pulp capped with a mineral trioxide aggregate (MTA) and Ca(OH) 2 powder. Methods and Material: Pulp exposures were performed on the occlusal floor of 40 permanent premolars. The pulp was then capped with either Ca(OH) 2 powder (CH) or MTA and restored with resin composite. After 30 days (groups CH30 and MTA30) and 60 days (groups CH60 and MTA60), the teeth were extracted and processed for HE and categorized in a histological score system. The data were subjected to Kruskal-Wallis and Conover tests (α=0.05). Results: In regard to dentin bridge formation, CH30 showed a tendency towards superior performance compared to MTA30 (p>0.05), although the products showed comparable results at day 60. In the item Inflammation and General State of the Pulp (p>0.05), CH showed a tendency towards presenting a higher inflammatory response. In the item Other Pulpal Findings, MTA and Ca(OH) 2 showed equal and excellent performance after 30 and 60 days (p>0.05). Conclusion: After 30 days, Ca(OH) 2 powder covered with calcium hydroxide cement showed faster hard tissue bridge formation compared to MTA. After 60 days, Ca(OH) 2 powder or MTA materials showed a similar and excellent histological response with the formation of a hard tissue bridge in almost all cases with low inflammatory infiltrate. © Operative Dentistry...

CCL3 and CXCL12 production in vitro by dental pulp fibroblasts from permanent and deciduous teeth stimulated by Porphyromonas gingivalis LPS

Sipert, Carla Renata; Morandini, Ana Carolina de Faria; Modena, Karin Cristina da Silva; Dionisio, Thiago Jose; Machado, Maria Aparecida Andrade Moreira; Oliveira, Sandra Helena Penha de; Campanelli, Ana Paula; Santos, Carlos Ferreira
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 99-105
ENG
Relevância na Pesquisa
66.69%
Objective: The aim of this study was to compare the production of the chemokines CCL3 and CXCL12 by cultured dental pulp fibroblasts from permanent (PDPF) and deciduous (DDPF) teeth under stimulation by Porphyromonas gingivalis LPS (PgLPS). Material and Methods: Primary culture of fibroblasts from permanent (n=3) and deciduous (n=2) teeth were established using an explant technique. After the fourth passage, fibroblasts were stimulated by increasing concentrations of PgLPS (0 - 10 pg/mL) at 1, 6 and 24 h. The cells were tested for viability through MTT assay, and production of the chemokines CCL3 and CXCL12 was determined through ELISA. Comparisons among samples were performed using One-way ANOVA for MTT assay and Two-way ANOVA for ELISA results. Results: Cell viability was not affected by the antigen after 24 h of stimulation. PgLPS induced the production of CCL3 by dental pulp fibroblasts at similar levels for both permanent and deciduous pulp fibroblasts. Production of CXCL12, however, was significantly higher for PDPF than DDPF at 1 and 6 h. PgLPS, in turn, downregulated the production of CXCL12 by PDPF but not by DDPF. Conclusion: These data suggest that dental pulp fibroblasts from permanent and deciduous teeth may present a differential behavior under PgLPS stimulation.

Avaliação dos efeitos diretos da radioterapia sobre a microvascularização, a inervação e a matriz extracelular da polpa dental de pacientes oncológicos; Evaluation of the direct effects of radiation on microvasculature, innervation and extracellular matrix dental pulp of cancer patients

Karina Morais Faria
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 29/07/2013 PT
Relevância na Pesquisa
66.71%
O tratamento do câncer de cabeça e pescoço está associado a uma série de toxicidades bucais. Neste contexto, evidências clínicas recentes demonstraram que a radioterapia em cabeça e pescoço provoca alterações na microvascularização e na inervação pulpar. Entretanto, estas alterações não foram demonstradas por meio de estudos morfológicos do tecido pulpar oriundo de pacientes oncológicos. Portanto, esta dissertação se propôs a investigar os efeitos diretos da radioterapia sobre a microvascularização, a inervação e a matriz extracelular da polpa de pacientes com câncer de cabeça e pescoço que foram submetidos à radioterapia. Foram utilizadas 40 amostras de polpa dental humana que foram divididas em dois grupos. No grupo irradiado, foram utilizadas 23 amostras de polpa obtidas de pacientes que haviam concluído radioterapia na região de cabeça e pescoço. O grupo controle foi composto por 17 amostras de polpas obtidas de pacientes sem histórico de radioterapia. Os espécimes dos dois grupos foram processados histologicamente e submetidos à coloração por meio da técnica da hematoxilina e eosina para avaliação morfológica da microvascularização, da inervação e da matriz extracelular das polpas. Adicionalmente...

Lipopolysaccharide-induced dental pulp cell apoptosis and the expression of Bax and Bcl-2 in vitro

Yang,H.; Zhu,Y.T.; Cheng,R.; Shao,M.Y.; Fu,Z.S.; Cheng,L.; Wang,F.M.; Hu,T.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2010 EN
Relevância na Pesquisa
66.71%
Lipopolysaccharide exerts many effects on many cell lines, including cytokine secretion, and cell apoptosis and necrosis. We investigated the in vitro effects of lipopolysaccharide on apoptosis of cultured human dental pulp cells and the expression of Bcl-2 and Bax. Dental pulp cells showed morphologies typical of apoptosis after exposure to lipopolysaccharide. Flow cytometry showed that the rate of apoptosis of human dental pulp cells increased with increasing lipopolysaccharide concentration. Compared with controls, lipopolysaccharide promoted pulp cell apoptosis (P < 0.05) from 0.1 to 100 μg/mL but not at 0.01 μg/mL. Cell apoptosis was statistically higher after exposure to lipopolysaccharide for 3 days compared with 1 day, but no difference was observed between 3 and 5 days. Immunohistochemistry showed that expression of Bax and Bcl-2 was enhanced by lipopolysaccharide at high concentrations, but no evident expression was observed at low concentrations (0.01 and 0.1 μg/mL) or in the control groups. In conclusion, lipopolysaccharide induced dental pulp cell apoptosis in a dose-dependent manner, but apoptosis did not increase with treatment duration. The expression of the apoptosis regulatory proteins Bax and Bcl-2 was also up-regulated in pulp cells after exposure to a high concentration of lipopolysaccharide.

CCL3 and CXCL12 production in vitro by dental pulp fibroblasts from permanent and deciduous teeth stimulated by Porphyromonas gingivalis LPS

Sipert,Carla Renata; Morandini,Ana Carolina de Faria; Modena,Karin Cristina da Silva; Dionisio,Thiago Jose; Machado,Maria Aparecida Andrade Moreira; Oliveira,Sandra Helena Penha de; Campanelli,Ana Paula; Santos,Carlos Ferreira
Fonte: Faculdade De Odontologia De Bauru - USP Publicador: Faculdade De Odontologia De Bauru - USP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2013 EN
Relevância na Pesquisa
66.69%
Objective: The aim of this study was to compare the production of the chemokines CCL3 and CXCL12 by cultured dental pulp fibroblasts from permanent (PDPF) and deciduous (DDPF) teeth under stimulation by Porphyromonas gingivalis LPS (PgLPS). Material and Methods: Primary culture of fibroblasts from permanent (n=3) and deciduous (n=2) teeth were established using an explant technique. After the fourth passage, fibroblasts were stimulated by increasing concentrations of PgLPS (0 – 10 µg/mL) at 1, 6 and 24 h. The cells were tested for viability through MTT assay, and production of the chemokines CCL3 and CXCL12 was determined through ELISA. Comparisons among samples were performed using One-way ANOVA for MTT assay and Two-way ANOVA for ELISA results. Results: Cell viability was not affected by the antigen after 24 h of stimulation. PgLPS induced the production of CCL3 by dental pulp fibroblasts at similar levels for both permanent and deciduous pulp fibroblasts. Production of CXCL12, however, was significantly higher for PDPF than DDPF at 1 and 6 h. PgLPS, in turn, downregulated the production of CXCL12 by PDPF but not by DDPF. Conclusion: These data suggest that dental pulp fibroblasts from permanent and deciduous teeth may present a differential behavior under PgLPS stimulation.

Dental pulp stem cells express proteins involved in the local invasiveness of odontogenic myxoma

Miyagi,Sueli Patricia Harumi; Maranduba,Carlos Magno da Costa; Silva,Fernando de Sá; Marques,Márcia Martins
Fonte: Sociedade Brasileira de Pesquisa Odontológica - SBPqO Publicador: Sociedade Brasileira de Pesquisa Odontológica - SBPqO
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2012 EN
Relevância na Pesquisa
66.69%
Little is known about the histogenesis of the odontogenic myxoma (OM). Dental pulp stem cells could be candidate precursors of OM because both OM and the dental pulp share the same embryological origin: the dental papilla. For the purpose of comparing OM and stem cells, this study analyzed the expression of two proteins related to OM invasiveness (MMP-2 and hyaluronic acid) in human immature dental pulp stem cells (hIDPSCs). Three lineages of hIDPSCs from deciduous and permanent teeth were used in this study. Immunofluorescence revealed positive reactions for MMP-2 and hyaluronic acid (HA) in all hIDPSCs. MMP-2 appeared as dots throughout the cytoplasm, whereas HA appeared either as diffuse and irregular dots or as short fibrils throughout the cytoplasm and outside the cell bodies. The gene expression profile of each cell lineage was evaluated using RT-PCR analysis, and HA was expressed more intensively than MMP-2. HA expression was similar among the three hIDPSCs lineages, whereas MMP-2 expression was higher in DL-1 than in the other cell lines. The expression of proteins related to OM invasiveness in hIDPSCs could indicate that OM originates from dental pulp stem cells.

Engenharia Tecidual aplicada ?? regenera????o pulpar: An??lise da influ??ncia das porosidades de um scaffold sobre a prolifera????o e diferencia????o odontobl??stica de DPSCs; Tissue Engineering applied to Pulp Regeneration: Assessment of Scaffold pore size influence on proliferation and differentiation of Dental Pulp stem Cells.

CONDE, Marcus Cristian Muniz
Fonte: Universidade Federal de Pelotas; Odontologia; Programa de P??s-Gradua????o em Odontologia; UFPel; BR Publicador: Universidade Federal de Pelotas; Odontologia; Programa de P??s-Gradua????o em Odontologia; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
66.7%
Physicochemical properties and biological applicability of materials to be used in Tissue Engineering (TE) have great interest in the development of innovations in biotechnology. In dentistry research incomes every day and clarify the possibility to implement therapies for regeneration of dental pulp in clinical practice in a short time period. Such translation will require the ability to build a pulp tissue that completely fills the root canal dentin and produce appropriate vascularization to perform the metabolic exchanges needed for human tissues. To do it, we need achieve some advances; standardization of techniques and materials, which produce completely safe results, is essential to do the translation from the lab assays to RCT in humans. Based on that, the aim of this study was to perform a systematic review of the literature to analyze the knowledge regarding the importance of the interface between stem cells and scaffolds. Thereafter, we identify some gaps of knowledge in this field, as well as the techniques that have been employed today with potential to establish the transition from laboratory research to clinical. Among the obtained results, we have detected that the scaffold s physical properties, although imperative in determining cellular behavior were...

Perivascular niche of postnatal mesenchymal stem cells in human bone marrow and dental pulp

Shi, S.; Gronthos, S.
Fonte: Amer Soc Bone & Mineral Res Publicador: Amer Soc Bone & Mineral Res
Tipo: Artigo de Revista Científica
Publicado em //2003 EN
Relevância na Pesquisa
66.67%
Mesenchymal stem cell populations have previously been identified in adult bone marrow and dental pulp that are capable of regenerating the bone marrow and dental pulp microenvironments, respectively. Here we show that these stem cell populations reside in the microvasculature of their tissue of origin. Human bone marrow stromal stem cells (BMSSCs) and dental pulp stem cells (DPSCs) were isolated by immunoselection using the antibody, STRO-1, which recognizes an antigen on perivascular cells in bone marrow and dental pulp tissue. Freshly isolated STRO-1 positive BMSSCs and DPSCs were tested for expression of vascular antigens known to be expressed by endothelial cells (von Willebrand factor, CD146), smooth muscle cells, and pericytes (-smooth muscle actin, CD146), and a pericyte-associated antigen (3G5), by immunohistochemistry, fluorescence-activated cell sorting (FACS), and/or immunomagnetic bead selection. Both BMSSCs and DPSCs lacked expression of von Willebrand factor but were found to be positive for -smooth muscle actin and CD146. Furthermore, the majority of DPSCs expressed the pericyte marker, 3G5, while only a minor population of BMSSCs were found to be positive for 3G5. The finding that BMSSCs and DPSCs both display phenotypes consistent with different perivascular cell populations...

Eph/ephrinB mediate dental pulp stem cell mobilization and function

Arthur, A.; Koblar, S.; Shi, S.; Gronthos, S.
Fonte: Inter Amer Assoc Dental Research Publicador: Inter Amer Assoc Dental Research
Tipo: Artigo de Revista Científica
Publicado em //2009 EN
Relevância na Pesquisa
76.61%
Damage to the dentin matrix instigates the proliferation and mobilization of dental progenitor cells to the injury site, the mechanisms of which are not defined. EphB receptors and ephrin-B ligands expressed within the perivascular niche of dental pulp have been implicated following tooth injury. We propose that elevated levels of ephrin-B1 following injury may prevent the proliferation and migration of dental pulp stem cell (DPSC), while EphB/ephrin-B interaction facilitates odontoblastic differentiation. The migration, proliferation, and differentiation of DPSC in response to Eph/ephrin-B molecules was assessed in an established ex vivo tooth injury model and by in vitro assays for the assessment of colony formation and differentiation. Analysis of our data demonstrated that EphB forward signaling promoted DPSC proliferation, while inhibiting migration. Conversely, reverse signaling enhanced DPSC mineral production. These observations suggest that EphB/ephrin-B molecules are important for perivascular DPSC migration toward the dentin surfaces and differentiation into functional odontoblasts, following damage to the dentin matrix.; A. Arthur, S. Koblar, S. Shi and S. Gronthos

Scaffolds to Control Inflammation and Facilitate Dental Pulp Regeneration

Colombo, John S.; Moore, Amanda N.; Hartgerink, Jeffrey D.; D'Souza, Rena N.
Fonte: Universidade Rice Publicador: Universidade Rice
Tipo: Journal article; Text; post-print
ENG
Relevância na Pesquisa
66.75%
In dentistry, the maintenance of a vital dental pulp is of paramount importance because teeth devitalized by root canal treatment may become more brittle and prone to structural failure over time. Advanced carious lesions can irreversibly damage the dental pulp by propagating a sustained inflammatory response throughout the tissue. Although the inflammatory response initially drives tissue repair, sustained inflammation has an enormously destructive effect on the vital pulp, eventually leading to total necrosis of the tissue and necessitating its removal. The implications of tooth devitalization have driven significant interest in the development of bioactive materials that facilitate the regeneration of damaged pulp tissues by harnessing the capacity of the dental pulp for self-repair. In considering the process by which pulpitis drives tissue destruction, it is clear that an important step in supporting the regeneration of pulpal tissues is the attenuation of inflammation. Macrophages, key mediators of the immune response, may play a critical role in the resolution of pulpitis because of their ability to switch to a proresolution phenotype. This process can be driven by the resolvins, a family of molecules derived from fatty acids that show great promise as therapeutic agents. In this review...