Dental pulp stem cells
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Dental Pulp Stem Cells, or (DPSCs) are multipotent stem cells that have the potential to differentiate into a variety of cell types.
More recently a subpopulation of dental pulp stem cells has been described as human Immature Dental Pulp Stem Cells (IDPSC). There are various studies where the importance of these cells and their regenerative capacity has been demonstrated. Through the addition of tissue-specific cytokines, differentiated cells were obtained in vitro from these cells, not only of mesenchymal linage but also of endo- and ecto-dermal linage. Among them are the IPS, MAPCs cells.
Several publications have stressed the importance of the expression of pluripotentiality associated markers: the transcription factors Nanog, Sox2, Oct3/4, SSEA4, CD13, are indispensable for the stem cells to divide indefinitely without affecting their differentiation potential, i.e., maintaining their self-renovation capacity. The quantification of protein expression levels in these cells is very important in order to know their pluripotentiality level, as described in some publications.
Atari M et al, established a protocol for isolating and identifying the subpopulations of pluripotent- like stem cells from the dental pulp (DPPSC) These cells are SSEA4+, OCT3/4+, NANOG+, SOX2+, LIN28+, CD13+, CD105+, CD34-, CD45-, CD90+, CD29+, CD73+, STRO1+ and CD146-, and they show genetic stability in vitro based on genomic analysis with a newly described CGH technique.
DPPSCs were able to form both embryoid bodies-like structures (EBs) in vitro and teratoma-like structures that contained tissues derived from all three embryonic germ layers when injected in nude mice. DPPSCs can differentiate in vitro into tissues that have similar characteristics to mesoderm, endoderm and ectoderm layers.
Dental pulp is the soft living tissue inside a tooth. Stem cells are found inside the soft living tissue. Scientists have identified the mesenchymal type of stem cell inside dental pulp. This particular type of stem cell has the future potential to differentiate into a variety of other cell types including:
- Myocardiocytes to repair damaged cardiac tissue following a heart attack 
- Neuronal to generate nerve and brain tissue
- Myocytes to repair muscle 
- Osteocytes to generate bone 
- Chondrocytes to generate cartilage
- Adipocytes to generate fat 
- Bone and tissue from the oral cavity.
- 2005 NIH announces discovery of DPSCs by Dr. Irina Kerkis 
- 2006 IDPSC Kerkis reported discovery of Immature Dental Pulp Stem Cells (IDPSC), a pluripotent sub-population of DPSC using dental pulp organ culture.
- 2007 DPSC 1st animal studies begin for bone regeneration.
- 2007 DPSC 1st animal studies begin for dental end uses.
- 2008 DPSC 1st animal studies begin for heart therapies.
- 2008 IDPSC 1st animal study began for muscular dystrophy therapies.
- 2008 DPSC 1st animal studies begin for regenerating brain tissue.
- 2008 DPSC 1st advanced animal study for bone grafting announced. Reconstruction of large size cranial bone defects in rats.
- 2010 IDPSC 1st human trial for cornea replacement
- Kerkis, Irina; Kerkis, Alexandre; Dozortsev, Dmitri; Stukart-Parsons, GaËlle Chopin; Gomes Massironi, SÍLvia Maria; Pereira, Lygia V.; Caplan, Arnold I.; Cerruti, Humberto F. (2006). "Isolation and Characterization of a Population of Immature Dental Pulp Stem Cells Expressing OCT-4 and Other Embryonic Stem Cell Markers". Cells Tissues Organs 184 (3–4): 105–16. doi:10.1159/000099617. PMID 17409736.
- National Institute of Health (NIH) press release Monday, April 21, 2003 http://www.nih.gov/news/pr/apr2003/nidcr-21.html[dead link]
- Gandia, Carolina; Armiñan, Ana; García-Verdugo, Jose Manuel; Lledó, Elisa; Ruiz, Amparo; Miñana, M Dolores; Sanchez-Torrijos, Jorge; Payá, Rafael et al. (2008). "Human Dental Pulp Stem Cells Improve Left Ventricular Function, Induce Angiogenesis, and Reduce Infarct Size in Rats with Acute Myocardial Infarction". Stem Cells 26 (3): 638–45. doi:10.1634/stemcells.2007-0484. PMID 18079433.
- Nosrat, I; Widenfalk, J; Olson, L; Nosrat, CA (2001). "Dental Pulp Cells Produce Neurotrophic Factors, Interact with Trigeminal Neurons in Vitro, and Rescue Motoneurons after Spinal Cord Injury". Developmental Biology 238 (1): 120–32. doi:10.1006/dbio.2001.0400. PMID 11783998.[not in citation given]
- Kerkis, Irina; Ambrosio, Carlos E; Kerkis, Alexandre; Martins, Daniele S; Zucconi, Eder; Fonseca, Simone AS; Cabral, Rosa M; Maranduba, Carlos MC et al. (2008). "Early transplantation of human immature dental pulp stem cells from baby teeth to golden retriever muscular dystrophy (GRMD) dogs: Local or systemic?". Journal of Translational Medicine 6: 35. doi:10.1186/1479-5876-6-35. PMC 2529267. PMID 18598348.
- Graziano, Antonio; D'aquino, Riccardo; Angelis, Maria Gabriella Cusella-De; De Francesco, Francesco; Giordano, Antonio; Laino, Gregorio; Piattelli, Adriano; Traini, Tonino et al. (2008). "Scaffold's surface geometry significantly affects human stem cell bone tissue engineering". Journal of Cellular Physiology 214 (1): 166–72. doi:10.1002/jcp.21175. PMID 17565721.
- D’aquino, Riccardo; Papaccio, Gianpaolo; Laino, Gregorio; Graziano, Antonio (2008). "Dental Pulp Stem Cells: A Promising Tool for Bone Regeneration". Stem Cell Reviews 4 (1): 21–6. doi:10.1007/s12015-008-9013-5. PMID 18300003.
- Stem Cell Information, National Institute of Health
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- Onyekwelu, O; Seppala, M; Zoupa, M; Cobourne, MT (2007). "Tooth development: 2. Regenerating teeth in the laboratory". Dental update 34 (1): 20–2, 25–6, 29. PMID 17348555.
- Cordeiro, Mabel M.; Dong, Zhihong; Kaneko, Tomoatsu; Zhang, Zhaocheng; Miyazawa, Marta; Shi, Songtao; Smith, Anthony J.; Nör, Jacques E. (2008). "Dental Pulp Tissue Engineering with Stem Cells from Exfoliated Deciduous Teeth". Journal of Endodontics 34 (8): 962–9. doi:10.1016/j.joen.2008.04.009. PMID 18634928.
Atari M, Gil-Recio C, Fabregat M, García-Fernández DA, Barajas M, Carrasco M, Jung HS, Hernández-Alfaro F, Casals N, Prosper F, Ferrés Padró E, Giner L. Dental Pulp of the Third Molar: A New Source of Pluripotent-like Stem Cells.J Cell Sci. 2012 Mar 30. [Epub ahead of print]