J Endod
Department of Dental Regenerative Medicine, National Center for Geriatrics and Gerontology, Research Institute, Aichi, Japan.
Published: July 2012
Introduction: Pulp stem/progenitor cells have been successfully transplanted after pulpectomy in dogs and have led to pulp regeneration. The regenerated pulp tissue was investigated by the qualitative and quantitative protein expression patterns in comparison with those of normal pulp. There is an unmet need for a quality standard for regenerated pulp tissue.
Methods: Three distinct human CD105(+) stem/progenitor cells from dental pulp, bone marrow, and amnion were compared by 2-dimensional electrophoresis and the differential proteomic expression profiles. The protein identified with high confidence in pulp CD105(+) cells was examined by immunohistochemistry and real-time reverse-transcription polymerase chain reaction in regenerated pulp tissue compared with normal pulp. Its migration effect was further examined in pulp CD105(+) cells using small interfering RNA techniques to knock down the protein.
Results: Nine protein spots were detected solely in pulp CD105(+) cells; one of these was identified as vimentin. The expression of vimentin messenger RNA was highest in pulp tissue among a variety of human tissues and higher in pulp CD105(+) cells compared with other CD105(+) cells and unfractionated total pulp cells. Pulp cells and endothelial cells were positively stained with vimentin in regenerated pulp tissue similarly as those in normal pulp tissue. The expression of vimentin in regenerated pulp was similar to normal pulp. RNA interference knock down of vimentin expression in pulp CD105(+) cells significantly reduced the migration activity.
Conclusions: The highest expression of vimentin in pulp tissue among other tissues and its migration effect in pulp stem cells suggest that it is a quality standard for pulp regeneration and pulp cell function.
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http://dx.doi.org/10.1016/j.joen.2012.01.010 | DOI Listing |
Equine Vet J
January 2025
University of Liverpool, Institute of Life Course and Medical Sciences, Liverpool, UK.
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January 2025
Nanfang Hospital, Southern Medical University, Guangzhou, China.
Dental pulp regeneration is significantly aided by human dental pulp stem cells (hDPSCs). An increasing number of studies have demonstrated that circular RNAs (circRNAs) are crucial in the multidirectional differentiation of many mesenchymal stem cells, but their specific functions and mechanisms remain unknown. This work aimed at elucidating the molecular mechanism by which hsa_circ_0001599 works in hDPSCs during odontogenic differentiation.
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January 2025
Polymer Chemistry and Biomaterials (PBM) Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281, Gent, 9000, BELGIUM.
Volumetric bioprinting has revolutionized the field of biofabrication by enabling the creation of cubic centimeter-scale living constructs at faster printing times (in the order of seconds). However, a key challenge remains: developing a wider variety of available osteogenic bioinks that allow osteogenic maturation of the encapsulated cells within the construct. Herein, the bioink exploiting a step-growth mechanism (norbornene-norbornene functionalized gelatin in combination with thiolated gelatin - GelNBNBSH) outperformed the bioink exploiting a chain-growth mechanism (gelatin methacryloyl - GelMA), as the necessary photo-initiator concentration was three times lower combined with a more than 50 % reduction in required light exposure dose resulting in an improved positive and negative resolution.
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January 2025
Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel.
Trained immunity (TI) is the process wherein innate immune cells gain functional memory upon exposure to specific ligands or pathogens, leading to augmented inflammatory responses and pathogen clearance upon secondary exposure. While the differentiation of hematopoietic stem cells (HSCs) and reprogramming of bone marrow (BM) progenitors are well-established mechanisms underpinning durable TI protection, remodeling of the cellular architecture within the tissue during TI remains underexplored. Here, we study the effects of peritoneal Bacillus Calmette-Guérin (BCG) administration to find TI-mediated protection in the spleen against a subsequent heterologous infection by the Gram-negative pathogen Typhimurium (.
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January 2025
Department of Prosthodontics, Indira Gandhi Institute of Dental Sciences, Nellikuzhi, Kothamangalam 686691, Kerala, India.
Dental caries causes mineral loss and organic damage to teeth. Understanding caries and dentin pulp reactions is crucial for effective caries management strategies. There is a lack of knowledge regarding the microscopic and ultramicroscopic changes that occur during caries destruction and reactive changes.
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