1
|
Ma M. Role of Hypoxia in Mesenchymal Stem Cells from Dental Pulp: Influence, Mechanism and Application. Cell Biochem Biophys 2024:10.1007/s12013-024-01274-0. [PMID: 38713403 DOI: 10.1007/s12013-024-01274-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/08/2024] [Indexed: 05/08/2024]
Abstract
Mesenchymal stem cells (MSCs) from dental pulp (DP-MSCs), which include dental pulp stem cells (DPSCs) isolated from permanent teeth and stem cells from human exfoliated deciduous teeth (SHED), have emerged as highly promising cell sources for tissue regeneration, due to their high proliferative rate, multi-lineage differentiation capability and non-invasive accessibility. DP-MSCs also exert extensive paracrine effects through the release of extracellular vesicles (EVs) and multiple trophic factors. To be noted, the microenvironment, commonly referred to as the stem cell niche, plays a crucial role in shaping the functionality and therapeutic effects of DP-MSCs, within which hypoxia has garnered considerable attention. Extensive research has demonstrated that hypoxic conditions profoundly impact DP-MSCs. Specifically, hypoxia promotes DP-MSC proliferation, survival, stemness, migration, and pro-angiogenic potential while modulating their multi-lineage differentiation capacity. Furthermore, hypoxia stimulates the paracrine activities of DP-MSCs, leading to an increased production of EVs and soluble factors. Considering these findings, hypoxia preconditioning has emerged as a promising approach to enhance the therapeutic potential of DP-MSCs. In this comprehensive review, we provide a systematic overview of the influence of hypoxia on DP-MSCs, shedding light on the underlying mechanisms involved. Moreover, we also discuss the potential applications of hypoxia-preconditioned DP-MSCs or their secretome in tissue regeneration. Additionally, we delve into the methodologies employed to simulate hypoxic environments. This review aims to promote a comprehensive and systematic understanding of the hypoxia-induced effects on DP-MSCs and facilitate the refinement of regenerative therapeutic strategies based on DP-MSCs.
Collapse
Affiliation(s)
- Muyuan Ma
- School of Medicine, South China University of Technology, Guangzhou, China.
| |
Collapse
|
2
|
Liu Y, Ren L, Li M, Zheng B, Liu Y. The Effects of Hypoxia-Preconditioned Dental Stem Cell-Derived Secretome on Tissue Regeneration. TISSUE ENGINEERING. PART B, REVIEWS 2024. [PMID: 38613806 DOI: 10.1089/ten.teb.2024.0054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/15/2024]
Abstract
Mesenchymal stroma cells derived from oral tissues are known as dental stem cells (DSCs). Owing to their unique therapeutic niche and clinical accessibility, DSCs serve as a promising treatment option for bone defects and oral tissue regeneration. DSCs exist in a hypoxic microenvironment in vivo, which is far lower than the current 20% oxygen concentration used in in vitro culture. It has been widely reported that the application of an oxygen concentration less than 5% in the culture of DSCs is beneficial for preserving stemness and promoting proliferation, migration, and paracrine activity. The paracrine function of DSCs involves the secretome, which includes conditioned media (CM) and soluble bioactive molecules, as well as extracellular vesicles extracted from CM. Hypoxia can play a role in immunomodulation and angiogenesis by altering the protein or nucleic acid components in the secretory group, which enhances the therapeutic potential of DSCs. This review summarizes the biological characteristics of DSCs, the influence of hypoxia on DSCs, the impact of hypoxia on the secretory group of DSCs, and the latest progress on the use of DSCs secretory group in tissue regeneration based on hypoxia pretreatment. We highlighted the multifunctional biological effect of hypoxia culture on tissue regeneration and provided a summary of the current mechanism of hypoxia in the pretreatment of DSCs.
Collapse
Affiliation(s)
- Yi Liu
- Department of Orthodontics, School and Hospital of Stomatology, Shenyang Clinical Medical Research Center of Orthodontic Disease, China Medical University, Shenyang, China
| | - Ling Ren
- Department of Orthodontics, School and Hospital of Stomatology, Shenyang Clinical Medical Research Center of Orthodontic Disease, China Medical University, Shenyang, China
| | - Mengyao Li
- Department of Orthodontics, School and Hospital of Stomatology, Shenyang Clinical Medical Research Center of Orthodontic Disease, China Medical University, Shenyang, China
| | - Bowen Zheng
- Department of Orthodontics, School and Hospital of Stomatology, Shenyang Clinical Medical Research Center of Orthodontic Disease, China Medical University, Shenyang, China
| | - Yi Liu
- Department of Orthodontics, School and Hospital of Stomatology, Shenyang Clinical Medical Research Center of Orthodontic Disease, China Medical University, Shenyang, China
| |
Collapse
|
3
|
Sadri F, Rezaei Z, Fereidouni M. The significance of the SDF-1/CXCR4 signaling pathway in the normal development. Mol Biol Rep 2022; 49:3307-3320. [PMID: 35067815 DOI: 10.1007/s11033-021-07069-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Accepted: 12/08/2021] [Indexed: 12/19/2022]
Abstract
Chemokines are chemoattractants that can regulate cell movement and adhesion. SDF-1 [stromal cell-derived factor-1 (SDF-1)] is a homeostatic CXC chemokine. SDF-1 and its receptors [CXC chemokine receptor 4 (CXCR4)] form a signaling pathway that plays critical roles in different pathological and physiological mechanisms, including embryogenesis, wound healing, angiogenesis, tumor growth, and proliferation. Therefore, the current review aimed to summarize the related studies that addressed the molecular signature of the SDF-1/CXCR4 pathway and to explain how this axis is involved in normal events.
Collapse
Affiliation(s)
- Farzad Sadri
- Student Research Committee, Birjand University of Medical Sciences, Birjand, Iran
| | - Zohreh Rezaei
- Department of Biology, University of Sistan and Baluchestan, Zahedan, Iran.,Cellular and Molecular Research Center, Birjand University of Medical Sciences, Birjand, Iran
| | - Mohammad Fereidouni
- Cellular and Molecular Research Center, Birjand University of Medical Sciences, Birjand, Iran. .,Department of Medical Immunology, Faculty of Medicine, Birjand University of Medical Sciences, Birjand, Iran.
| |
Collapse
|
4
|
Role of Lipopolysaccharide, Derived from Various Bacterial Species, in Pulpitis—A Systematic Review. Biomolecules 2022; 12:biom12010138. [PMID: 35053286 PMCID: PMC8774278 DOI: 10.3390/biom12010138] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/09/2022] [Accepted: 01/11/2022] [Indexed: 02/06/2023] Open
Abstract
Lipopolysaccharide (LPS) is widely used for induction of inflammation in various human tissues, including dental pulp. The purpose of this study was to summarize current medical literature focusing on (1) cell types used by researchers to simulate dental pulp inflammation, (2) LPS variants utilized in experimental settings and how these choices affect the findings. Our study was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). We searched for studies reporting outcomes of lipopolysaccharide application on dental pulp cells in vitro using electronic databases: MEDLINE, Web of Science and Scopus. Having gathered data from 115 papers, we aimed to present all known effects LPS has on different cell types present in dental pulp. We focused on specific receptors and particles that are involved in molecular pathways. Our review provides an essential foundation for further research using in vitro models of pulpitis.
Collapse
|
5
|
Zayed M, Iohara K, Watanabe H, Ishikawa M, Tominaga M, Nakashima M. Characterization of stable hypoxia-preconditioned dental pulp stem cells compared with mobilized dental pulp stem cells for application for pulp regenerative therapy. Stem Cell Res Ther 2021; 12:302. [PMID: 34051821 PMCID: PMC8164249 DOI: 10.1186/s13287-021-02240-w] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Accepted: 02/24/2021] [Indexed: 12/12/2022] Open
Abstract
Background Dental pulp stem cells (DPSCs) have been developed as a potential source of mesenchymal stem cells (MSCs) for regeneration of dental pulp and other tissues. However, further strategies to isolate highly functional DPSCs beyond the colony-forming methods are required. We have demonstrated the safety and efficacy of DPSCs isolated by G-CSF-induced mobilization and cultured under normoxia (mobilized DPSCs, MDPSCs) for pulp regeneration. The device for isolation of MDPSCs, however, is not cost-effective and requires a prolonged cell culture period. It is well known that MSCs cultured under hypoxic-preconditions improved MSC proliferation activity and stemness. Therefore, in this investigation, we attempted to improve the clinical utility of DPSCs by hypoxia-preconditioned DPSCs (hpDPSCs) compared with MDPSCs to improve the potential clinical utility for pulp regeneration in endodontic dentistry. Methods Colony-forming DPSCs were isolated and preconditioned with hypoxia in a stable closed cultured system and compared with MDPSCs isolated from the individual dog teeth. We examined the proliferation rate, migration potential, anti-apoptotic activity, and gene expression of the stem cell markers and angiogenic/neurotrophic factors. Trophic effects of the conditioned medium (CM) were also evaluated. In addition, the expression of immunomodulatory molecules upon stimulation with IFN-γ was investigated. The pulp regenerative potential and transplantation safety of hpDPSCs were further assessed in pulpectomized teeth in dogs by histological and immunohistochemical analyses and by chemistry of the blood and urine tests. Results hpDPSCs demonstrated higher proliferation rate and expression of a major regulator of oxygen homeostasis, HIF-1α, and a stem cell marker, CXCR-4. The direct migratory activity of hpDPSCs in response to G-CSF was significantly higher than MDPSCs. The CM of hpDPSCs stimulated neurite extension. However, there were no changes in angiogenic, migration, and anti-apoptotic activities compared with the CM of MDPSCs. The expression of immunomodulatory gene, PTGE was significantly upregulated by IFN gamma in hpDPSCs compared with MDPSCs. However, no difference in nitric oxide was observed. The regenerated pulp tissue was quantitatively and qualitatively similar in hpDPSC transplants compared with MDPSC transplants in dog teeth. There was no evidence of toxicity or adverse events of the hpDPSC transplantation. Conclusions These results demonstrated that the efficacy of hpDPSCs for pulp regeneration was identical, although hpDPSCs improved stem cell properties compared to MDPSCs, suggesting their potential clinical utility for pulp regeneration. Supplementary Information The online version contains supplementary material available at 10.1186/s13287-021-02240-w.
Collapse
Affiliation(s)
- Mohammed Zayed
- Research Institute, Department of Stem Cell Biology and Regenerative Medicine, National Center for Geriatrics and Gerontology, 7-430, Morioka, Obu, Aichi, 474-8511, Japan.,Department of Surgery, College of Veterinary Medicine, South Valley University, Qena, 83523, Egypt
| | - Koichiro Iohara
- Research Institute, Department of Stem Cell Biology and Regenerative Medicine, National Center for Geriatrics and Gerontology, 7-430, Morioka, Obu, Aichi, 474-8511, Japan
| | - Hideto Watanabe
- Institute for Molecular Science of Medicine, Aichi Medical University, Nagakute, Aichi, 480-1195, Japan
| | - Mami Ishikawa
- Air Water Group, Aeras Bio Inc., Kobe, Hyogo, 650-047, Japan
| | - Michiyo Tominaga
- Research Institute, Department of Stem Cell Biology and Regenerative Medicine, National Center for Geriatrics and Gerontology, 7-430, Morioka, Obu, Aichi, 474-8511, Japan
| | - Misako Nakashima
- Research Institute, Department of Stem Cell Biology and Regenerative Medicine, National Center for Geriatrics and Gerontology, 7-430, Morioka, Obu, Aichi, 474-8511, Japan. .,Air Water Group, Aeras Bio Inc., Kobe, Hyogo, 650-047, Japan.
| |
Collapse
|
6
|
Fang J, Xu J, Zhang Y, Chen H, Ma Z, Huang Z, Hu J. Stromal cell-derived factor-1 may play pivotal role in distraction-stimulated neovascularization of diabetic foot ulcer. Med Hypotheses 2021; 149:110548. [PMID: 33690002 DOI: 10.1016/j.mehy.2021.110548] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 02/16/2021] [Accepted: 02/24/2021] [Indexed: 02/05/2023]
Abstract
Diabetic foot ulcer (DFU) has become a major medical, social and economic concern worldwide. It is highly desirable to develop promising new solutions to effectively and appropriately treat DFU. In recent years, investigators have used an innovative technology called proximal tibial cortex transverse distraction (PTCTD) to treat DFU and have achieved satisfactory results in terms of improved wound healing and circumvention of amputation as a consequence of enhanced neovascularization and perfusion of the ulcerated feet after the operation, but the underlying mechanism has not been explored. Previous studies have suggested that in addition to stimulating osteogenesis, bone distraction also facilitates neovascularization, which may be associated with the chemokine stromal cell-derived factor-1 (SDF-1). As an important member of the chemokine family, SDF-1 is primarily responsible for the homing and migration of endothelial progenitor cells (EPCs) or bone marrow-derived mesenchymal stem cells (BMSCs), and plays a central role in the process of neovascularization. In vivo or in vitro experiments show that bone distraction can induce the expression of SDF-1 and increase its plasma concentration. Moreover, some researchers have found that an insufficient level of SDF-1 in the circulation and wounds of patients with DFU can lead to impaired neovascularization. Therefore, we believe that SDF-1 plays an important role in promoting neovascularization of DFU as a result of bone distraction. We summarize the currently relevant literature to put forward an undisclosed but meaningful mechanism of bone distraction in the treatment of DFU.
Collapse
Affiliation(s)
- Jiezhuang Fang
- Department of Orthopedics, the First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Jiankun Xu
- Department of Orthopedics, the First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Yuantao Zhang
- Department of Orthopedics, the First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Hongjiang Chen
- Department of Orthopedics, the First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Zebin Ma
- Department of Orthopedics, the First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Zhonglian Huang
- Department of Orthopedics, the First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
| | - Jun Hu
- Department of Orthopedics, the First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China.
| |
Collapse
|
7
|
Modulation of the Dental Pulp Stem Cell Secretory Profile by Hypoxia Induction Using Cobalt Chloride. J Pers Med 2021; 11:jpm11040247. [PMID: 33808091 PMCID: PMC8066657 DOI: 10.3390/jpm11040247] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Revised: 03/19/2021] [Accepted: 03/23/2021] [Indexed: 12/15/2022] Open
Abstract
The action of stem cells is mediated by their paracrine secretions which comprise the secretory profile. Various approaches can be used to modify the secretory profile of stem cells. Creating a hypoxic environment is one method. The present study aims to demonstrate the influence of CoCl2 in generating hypoxic conditions in a dental pulp stem cell (DPSCs) culture, and the effect of this environment on their secretory profile. DPSCs that were isolated from human permanent teeth were characterized and treated with different concentrations of CoCl2 to assess their viability by an 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and proliferation by a cell counting kit (CCK)-8 assay. The gene expression level of hypoxia-inducible factor 1-alpha (HIF-1α) was analyzed by quantitative real time polymerase chain reaction (qRT-PCR) to demonstrate a hypoxic environment. Comparative evaluation of the growth factors and cytokines were done by cytometric bead array. Gene expression levels of transcription factors OCT4 and SOX2 were analyzed by qRT-PCR to understand the effect of CoCl2 on stemness in DPSCs. DPSCs were positive for MSC-specific markers. Doses of CoCl2, up to 20 µM, did not negatively affect cell viability; in low doses (5 µM), it promoted cell survival. Treatment with 10 µM of CoCl2 significantly augmented the genetic expression of HIF-1α. Cells treated with 10 µM of CoCl2 showed changes in the levels of growth factors and cytokines produced. It was very evident that CoCl2 also increased the expression of OCT4 and SOX2, which is the modulation of stemness of DPSCs. A CoCl2 treatment-induced hypoxic environment modulates the secretory profile of DPSCs.
Collapse
|
8
|
Liu Y, Zhang Z, Li W, Tian S. PECAM1 Combines With CXCR4 to Trigger Inflammatory Cell Infiltration and Pulpitis Progression Through Activating the NF-κB Signaling Pathway. Front Cell Dev Biol 2021; 8:593653. [PMID: 33425898 PMCID: PMC7786183 DOI: 10.3389/fcell.2020.593653] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 12/07/2020] [Indexed: 11/13/2022] Open
Abstract
Pulpitis is a frequent bacterially driven inflammation featured with the local accumulation of inflammatory products in human dental pulps. A GEO dataset GSE16134 comprising data of inflamed dental pulp tissues was used for bioinformatics analyses. A protein-protein interaction (PPI) analysis suggested that chemokine receptor 4 (CXCR4) owned a high correlation with platelet endothelial cell adhesion molecule-1 (PECAM1). A rat model with pulpitis was established, and lipopolysaccharide (LPS)-induced human dental pulp fibroblasts (HDPFs) were used for in vitro experiments. Then, high expression of PECAM1 and CXCR4 was validated in the inflamed dental pulp tissues in rats and in LPS-induced HDPFs. Either downregulation of PECAM1 or CXCR4 suppressed inflammatory cell infiltration in inflamed tissues as well as the inflammation and apoptosis of HDPFs. A transcription factor myocyte-enhancer factor 2 (MEF2C) was predicted and validated as a positive regulator of either PECAM1 or CXCR4, which activated the NF-κB signaling pathway and promoted pulpitis progression. To sum up, this study suggested that MEF2C transcriptionally activates PECAM1 and CXCR4 to activate the B-cell and NF-κB signaling pathways, leading to inflammatory cell infiltration and pulpitis progression.
Collapse
Affiliation(s)
- Yonghong Liu
- Department of Oral Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang, China
| | - Zhiyong Zhang
- Department of Oral Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang, China
| | - Wenjing Li
- Department of Oral Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang, China
| | - Songbo Tian
- Department of Oral Medicine, The Second Hospital of Hebei Medical University, Shijiazhuang, China
| |
Collapse
|
9
|
Kim Y, Park JY, Park HJ, Kim MK, Kim YI, Kim HJ, Bae SK, Bae MK. Pentraxin-3 Modulates Osteogenic/Odontogenic Differentiation and Migration of Human Dental Pulp Stem Cells. Int J Mol Sci 2019; 20:ijms20225778. [PMID: 31744201 PMCID: PMC6887979 DOI: 10.3390/ijms20225778] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 11/11/2019] [Accepted: 11/15/2019] [Indexed: 12/11/2022] Open
Abstract
Pentraxin-3 (PTX3) is recognized as a modulator of inflammation and a mediator of tissue repair. In this study, we characterized the role of PTX3 on some biological functions of human dental pulp stem cells (HDPSCs). The expression level of PTX3 significantly increased during osteogenic/odontogenic differentiation of HDPSCs, whereas the knockdown of PTX3 decreased this differentiation. Silencing of PTX3 in HDPSCs inhibited their migration and C-X-C chemokine receptor type 4 (CXCR4) expression. Our present study indicates that PTX3 is involved in osteogenic/odontogenic differentiation and migration of HDPSCs, and may contribute to the therapeutic potential of HDPSCs for regeneration and repair.
Collapse
Affiliation(s)
- Yeon Kim
- Department of Oral Physiology, Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan 50610, Korea; (Y.K.); (J.-Y.P.); (H.-J.P.); (M.-K.K.); (H.J.K.)
| | - Joo-Yeon Park
- Department of Oral Physiology, Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan 50610, Korea; (Y.K.); (J.-Y.P.); (H.-J.P.); (M.-K.K.); (H.J.K.)
| | - Hyun-Joo Park
- Department of Oral Physiology, Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan 50610, Korea; (Y.K.); (J.-Y.P.); (H.-J.P.); (M.-K.K.); (H.J.K.)
| | - Mi-Kyoung Kim
- Department of Oral Physiology, Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan 50610, Korea; (Y.K.); (J.-Y.P.); (H.-J.P.); (M.-K.K.); (H.J.K.)
| | - Yong-Il Kim
- Department of Orthodontics, School of Dentistry, Pusan National University, Yangsan 50610, Korea;
| | - Hyung Joon Kim
- Department of Oral Physiology, Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan 50610, Korea; (Y.K.); (J.-Y.P.); (H.-J.P.); (M.-K.K.); (H.J.K.)
| | - Soo-Kyung Bae
- Department of Dental Pharmacology, School of Dentistry, Pusan National University, Yangsan 50610, Korea
| | - Moon-Kyoung Bae
- Department of Oral Physiology, Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan 50610, Korea; (Y.K.); (J.-Y.P.); (H.-J.P.); (M.-K.K.); (H.J.K.)
- Correspondence: ; Tel.: +82-51-510-8239
| |
Collapse
|
10
|
Shi R, Yang H, Lin X, Cao Y, Zhang C, Fan Z, Hou B. Analysis of the characteristics and expression profiles of coding and noncoding RNAs of human dental pulp stem cells in hypoxic conditions. Stem Cell Res Ther 2019; 10:89. [PMID: 30867055 PMCID: PMC6417198 DOI: 10.1186/s13287-019-1192-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 01/08/2019] [Accepted: 02/25/2019] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Human dental pulp stem cell (DPSC)-mediated regenerative endodontics is a promising therapy for damaged teeth; however, the hypoxic environment in root canals can affect tissue regeneration. In this study, we investigate the characteristics and possible regulatory mechanisms of DPSC function under hypoxic conditions. METHODS Human DPSCs were cultured under normoxia (20% O2) and hypoxia (3% O2). DPSC proliferation and osteo/odontogenic differentiation potential were assessed by Cell Counting Kit-8 (CCK8) assay, carboxyfluorescein succinimidyl ester (CFSE) assay, alkaline phosphatase (ALP) activity, Alizarin red staining, real-time RT-PCR assays, and western blot analysis. Microarray and bioinformatic analyses were performed to investigate the differences in the mRNA, lncRNA, and miRNA expression profiles of DPSCs. RESULTS DPSCs exhibited a more powerful proliferation ability and lower osteo/odontogenic differentiation potential in hypoxic conditions. A total of 60 mRNAs (25 upregulated and 35 downregulated), 47 lncRNAs (20 upregulated and 27 downregulated), and 14 miRNAs (7 upregulated and 7 downregulated) in DPSCs were differentially expressed in the hypoxia group compared with the normoxia group. Bioinformatic analysis identified that 7 mRNAs (GRPR, ERO1L, ANPEP, EPHX1, PGD, ANGPT1, and NQO1) and 5 lncRNAs (AF085958, AX750575, uc002czn.2, RP3-413H6.2, and six-twelve leukemia (STL)) may be associated with DPSCs during hypoxia according to CNC network analysis, while 28 mRNAs (including GYS1, PRKACB, and NQO1) and 13 miRNAs (including hsa-miR-3916 and hsa-miR-192-5p) may be involved according to miRNA target gene network analysis. The depletion of one candidate lncRNA, STL, inhibited the osteo/odontogenic differentiation potentials of DPSCs. CONCLUSIONS Our results revealed that hypoxia could enhance the proliferation ability and impair the osteo/odontogenic differentiation potential of DPSCs in vitro. Furthermore, our results identified candidate coding and noncoding RNAs that could be potential targets for improving DPSC function in regenerative endodontics and lead to a better understanding of the mechanisms of hypoxia's effects on DPSCs.
Collapse
Affiliation(s)
- Ruitang Shi
- Department of Endodontics, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, China
| | - Haoqing Yang
- Laboratory of Molecular Signaling and Stem Cells Therapy, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, China
| | - Xiao Lin
- Department of Implant Dentistry, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, China
| | - Yangyang Cao
- Laboratory of Molecular Signaling and Stem Cells Therapy, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, China
| | - Chen Zhang
- Laboratory of Molecular Signaling and Stem Cells Therapy, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, China
| | - Zhipeng Fan
- Laboratory of Molecular Signaling and Stem Cells Therapy, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, China.
| | - Benxiang Hou
- Department of Endodontics, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, China.
| |
Collapse
|
11
|
Luo S, Zhou C, Zhang J, Chen M, Li H, Zheng S, Quan J. Mutant monocyte chemoattractant protein-1 protein (7ND) inhibits osteoclast differentiation and reduces oral squamous carcinoma cell bone invasion. Oncol Lett 2018; 15:7760-7768. [PMID: 29725470 PMCID: PMC5920317 DOI: 10.3892/ol.2018.8308] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 01/23/2018] [Indexed: 12/31/2022] Open
Abstract
The seven-amino acid truncated (7ND) protein is an N-terminal deletion mutant of monocyte chemoattractant protein-1 (MCP-1) and it functions as a dominant-negative inhibitor. 7ND and wild-type MCP-1 form a heterodimer, which binds to MCP-1 receptors and inhibits monocyte chemotaxis. In the present study, the 7ND protein was cloned, expressed and purified. An MTT assay revealed that the proliferation of oral squamous cell carcinoma (OSCC) SCC25 cells was not affected following 3 days of treatment with synthetic 7ND protein. Serial dilutions of the 7ND protein were tested for monocyte migration and osteoclast differentiation, and tartrate-resistant acid phosphatase staining demonstrated that significantly fewer osteoclasts were differentiated from cluster of differentiation 14+ (CD14+) monocytes using magnetic activated cell sorting. Immunofluorescence confirmed these results and significantly less F-actin staining was observed in 7ND-treated osteoclasts. Furthermore, bone invasion was examined by subcutaneously injecting SCC25 cells into the area overlaying the calvariae of nude mice. The results demonstrated that the average tumor volume of SCC25 cells with 7ND protein was similar to the average volume of tumors formed by untreated SCC25 cells. Flow cytometric analysis suggested that the CD14+ subpopulation in the bone marrow of 7ND-treated mice was reduced compared with that of untreated mice. Micro-computed tomography imaging revealed significantly less bone resorption in the calvariae injected with SCC25 cells plus the 7ND protein. Taken together, the results of the present study demonstrated the potential therapeutic value of the 7ND protein. The 7ND MCP-1 variant not only functions in vitro to inhibit osteoclast differentiation, but also reduces the progression of bone invasion by OSCC cells in vivo.
Collapse
Affiliation(s)
- Shuyu Luo
- Department of Oral Pathology, School and Hospital of Stomatology, Tianjin Medical University, Heping, Tianjin 300070, P.R. China
| | - Chuanxiang Zhou
- Department of Oral Pathology, Peking University School and Hospital of Stomatology, Haidian, Beijing 100081, P.R. China
| | - Jianming Zhang
- Department of Stomatology, General Hospital of Tianjin Medical University, Heping, Tianjin 300052, P.R. China
| | - Mengshan Chen
- School of Public Health, Tianjin Medical University, Heping, Tianjin 300070, P.R. China
| | - Hongjie Li
- Department of Oral Pathology, School and Hospital of Stomatology, Tianjin Medical University, Heping, Tianjin 300070, P.R. China
| | - Shanchuan Zheng
- Department of Stomatology, WuQing People's Hospital, Wuqing, Tianjin 301700, P.R. China
| | - Jingjing Quan
- Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-Sen University and Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, Guangdong 510080, P.R. China
| |
Collapse
|
12
|
Janjić K, Lilaj B, Moritz A, Agis H. Formation of spheroids by dental pulp cells in the presence of hypoxia and hypoxia mimetic agents. Int Endod J 2017; 51 Suppl 2:e146-e156. [PMID: 28656722 DOI: 10.1111/iej.12806] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Accepted: 06/22/2017] [Indexed: 01/01/2023]
Abstract
AIM To evaluate the impact of hypoxia and hypoxia mimetic agents (HMA) on the formation and activity of spheroids by dental pulp cells (DPC). METHODOLOGY DPC on agarose-coated plates were treated with hypoxia and the HMA dimethyloxallyl glycine (DMOG), desferrioxamine (DFO) and L-mimosine (L-MIM). Images of spheroids were taken directly after seeding and at 6 h and 24 h. Spheroid sizes were quantified by area measurement with ImageJ software. Viability was assessed with Live-Dead staining, MTT and resazurin-based toxicity assay. Production of VEGF, IL-8 and SDF-1 was evaluated using immunoassays. Data were analysed using Kruskal-Wallis test and post hoc Mann-Whitney U-test. RESULTS DPC formed spheroids in the presence of hypoxia, HMA and combined treatment with hypoxia and HMA. No pronounced difference in spheroid size was found in the groups treated with hypoxia, DMOG, DFO, L-MIM and the combination of hypoxia and the HMA relative to their normoxic controls (P > 0.05). Spheroids appeared vital in Live-Dead and MTT staining and the resazurin-based toxicity assay. Evaluation of protein production with immunoassays revealed significantly enhanced levels of VEGF and IL-8 (P < 0.05), but there was no significant effect on SDF-1 production (P > 0.05). Treatment with a combination of hypoxia and HMA did not further boost VEGF and IL-8 production (P > 0.05). CONCLUSIONS Pre-conditioning with hypoxia and HMA increased the pro-angiogenic capacity of spheroids whilst not interfering with their formation. Pre-clinical studies will reveal whether pre-conditioning of spheroids with hypoxia and HMA can effectively improve the efficiency of cell transplantation approaches for regenerative endodontics.
Collapse
Affiliation(s)
- K Janjić
- Department of Conservative Dentistry and Periodontology, School of Dentistry, Medical University of Vienna, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - B Lilaj
- Department of Conservative Dentistry and Periodontology, School of Dentistry, Medical University of Vienna, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - A Moritz
- Department of Conservative Dentistry and Periodontology, School of Dentistry, Medical University of Vienna, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, Vienna, Austria
| | - H Agis
- Department of Conservative Dentistry and Periodontology, School of Dentistry, Medical University of Vienna, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, Vienna, Austria
| |
Collapse
|
13
|
Bae YK, Kim GH, Lee JC, Seo BM, Joo KM, Lee G, Nam H. The Significance of SDF-1α-CXCR4 Axis in in vivo Angiogenic Ability of Human Periodontal Ligament Stem Cells. Mol Cells 2017; 40:386-392. [PMID: 28614918 PMCID: PMC5523014 DOI: 10.14348/molcells.2017.0004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 04/29/2017] [Indexed: 12/28/2022] Open
Abstract
Periodontal ligament stem cells (PDLSCs) are multipotent stem cells derived from periodontium and have mesenchymal stem cell (MSC)-like characteristics. Recently, the perivascular region was recognized as the developmental origin of MSCs, which suggests the in vivo angiogenic potential of PDLSCs. In this study, we investigated whether PDLSCs could be a potential source of perivascular cells, which could contribute to in vivo angiogenesis. PDLSCs exhibited typical MSC-like characteristics such as the expression pattern of surface markers (CD29, CD44, CD73, and CD105) and differentiation potentials (osteogenic and adipogenic differentiation). Moreover, PDLSCs expressed perivascular cell markers such as NG2, αsmooth muscle actin, platelet-derived growth factor receptor β, and CD146. We conducted an in vivo Matrigel plug assay to confirm the in vivo angiogenic potential of PDLSCs. We could not observe significant vessel-like structures with PDLSCs alone or human umbilical vein endothelial cells (HU-VECs) alone at day 7 after injection. However, when PDLSCs and HUVECs were co-injected, there were vessel-like structures containing red blood cells in the lumens, which suggested that anastomosis occurred between newly formed vessels and host circulatory system. To block the SDF-1α and CXCR4 axis between PDLSCs and HUVECs, AMD3100, a CXCR4 antagonist, was added into the Matrigel plug. After day 3 and day 7 after injection, there were no significant vessel-like structures. In conclusion, we demonstrated the peri-vascular characteristics of PDLSCs and their contribution to in vivo angiogenesis, which might imply potential application of PDLSCs into the neovascularization of tissue engineering and vascular diseases.
Collapse
Affiliation(s)
- Yoon-Kyung Bae
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul 06351,
Korea
- Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419,
Korea
- Stem Cell and Regenerative Medicine Center, Research Institute for Future Medicine, Samsung Medical Center, Seoul 06351,
Korea
| | - Gee-Hye Kim
- Laboratory of Molecular Genetics, Dental Research Institute, School of Dentistry, Seoul National University, Seoul 03080,
Korea
| | - Jae Cheoun Lee
- Children’s Dental Center and CDC Baby Tooth Stem Cell Bank, Seoul 06072,
Korea
| | - Byoung-Moo Seo
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Seoul National University, Seoul 03080,
Korea
| | - Kyeung-Min Joo
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul 06351,
Korea
- Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419,
Korea
- Stem Cell and Regenerative Medicine Center, Research Institute for Future Medicine, Samsung Medical Center, Seoul 06351,
Korea
- Department of Anatomy & Cell Biology, Sungkyunkwan University School of Medicine, Suwon 16419,
Korea
| | - Gene Lee
- Laboratory of Molecular Genetics, Dental Research Institute, School of Dentistry, Seoul National University, Seoul 03080,
Korea
| | - Hyun Nam
- Single Cell Network Research Center, Sungkyunkwan University School of Medicine, Suwon 16419,
Korea
- Stem Cell and Regenerative Medicine Center, Research Institute for Future Medicine, Samsung Medical Center, Seoul 06351,
Korea
- Department of Neurosurgery, Samsung Medical Center, Sungkyunkwan University, Seoul 06351,
Korea
| |
Collapse
|
14
|
Comparative Evaluation of Chemotactic Factor Effect on Migration and Differentiation of Stem Cells of the Apical Papilla. J Endod 2017; 43:1288-1293. [PMID: 28578888 DOI: 10.1016/j.joen.2017.03.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 02/17/2017] [Accepted: 03/06/2017] [Indexed: 12/20/2022]
Abstract
INTRODUCTION Cell homing strategies could potentially be used in regenerative endodontic procedures (REPs) to promote the progressive coronal migration of stem cells, including stem cells of the apical papilla (SCAPs), along with formation of a new vascular network without the need for intentional apical trauma and intracanal bleeding. Although many chemotactic factors have been investigated for different mesenchymal stem cells, their effect on SCAP migration and differentiation is not fully understood. This study aimed to comparatively evaluate the effect of stromal cell-derived factor 1 (SDF-1), transforming growth factor beta 1 (TGF-β1), platelet-derived growth factor, granulocyte colony-stimulating factor (G-CSF), or fibroblast growth factor 2 (FGF-2) on the migration and differentiation of SCAPs. METHODS A characterized SCAP cell line was fluorescently labeled with Vybrant DiO dye (Life Technologies, Grand Island, NY) and used in transwell migration assays. Cells were subjected to 1, 10, or 100 ng/mL of each factor or a combination of factors followed by detection in a fluorescent plate reader. Lastly, SCAP differentiation into a mineralizing phenotype was evaluated in the presence or absence of the tested factors by quantitative alizarin red staining and alkaline phosphatase activity. Data were analyzed with 1-way analysis of variance with the Tukey post hoc test. RESULTS Maximum migration was observed with G-CSF or FGF-2, which was significantly greater than the effects observed by the other tested factors. A combination of G-CSF with TGF-β1 significantly augmented both migration and differentiation into a mineralizing phenotype. CONCLUSIONS G-CSF appears to be well suited to be further investigated as a key chemotactic factor in cell homing-based regenerative endodontic procedures.
Collapse
|
15
|
Xi L, Guoqing C, Weidong T. [Effect of hypoxia on the biological characteristics of human dental follicle cells]. HUA XI KOU QIANG YI XUE ZA ZHI = HUAXI KOUQIANG YIXUE ZAZHI = WEST CHINA JOURNAL OF STOMATOLOGY 2017; 35:245-252. [PMID: 28675007 DOI: 10.7518/hxkq.2017.03.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE This study aimed to investigate the effects of hypoxia on the characteristics of human dental follicle cells (hDFCs). METHODS The tissue explant collagenase method was used to isolate hDFCs from young permanent teeth. The immunofluorescence technique was used to detect cell surface markers, and the multi-differentiation potential was detected by multilineage differentiation induction assay. Then, the hypoxic microenvironment was physically mimicked, and the cells were divided into the normoxia group (20%O₂) and the hypoxia group (2%O₂). The effects of hypoxia on cell migration and proliferation were examined by Transwell chamber test and CCK-8 assay, respectively. The gene and protein expression levels of stemness-related markers at both oxygen concentrations were measured by quantitative real-time polymerase chain reaction (qRT-PCR) and Western blot, respectively. After osteogenic induction of both groups, qRT-PCR was performed to evaluate the osteogenesis-related gene, and alizarin red staining was used to assess the formation of mineralized nodules. RESULTS With the multi-differentiation capacity of osteogenic cells, adipogenic cells, and nerves, hDFCs demonstrate strong stem cell characteristics and possess the criteria of mesenchymal stem cells, which can meet the requirements of seed cells in dental tissue engineering. Hypoxia was conducive to the maintenance of hDFC stemness. Hypoxia promoted the migration and proliferation of hDFCs. The hDFCs were induced to osteogenic differentiation under hypoxic conditions, thereby enhancing osteogenesis. CONCLUSIONS Hypoxic microenvironment plays an important role in maintaining the stemness and promoting the proliferation, migration, and differentiation of hDFCs. Thus, this microenvironment could also serve several important functions in future clinical applications.
Collapse
Affiliation(s)
- Liang Xi
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Dept. of Oral and Maxillofacial Trauma and Plastic Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China;National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Chen Guoqing
- National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| | - Tian Weidong
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Dept. of Oral and Maxillofacial Trauma and Plastic Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China;National Engineering Laboratory for Oral Regenerative Medicine, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
| |
Collapse
|
16
|
Angiogenic Capacity of Dental Pulp Stem Cell Regulated by SDF-1 α-CXCR4 Axis. Stem Cells Int 2017; 2017:8085462. [PMID: 28588623 PMCID: PMC5447288 DOI: 10.1155/2017/8085462] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 02/26/2017] [Accepted: 03/01/2017] [Indexed: 01/07/2023] Open
Abstract
Previously, the perivascular characteristics of dental pulp stem cells (DPSCs) were reported, which suggested the potential application of DPSCs as perivascular cell source. In this study, we investigated whether DPSCs had angiogenic capacity by coinjection with human umbilical vein endothelial cells (HUVECs) in vivo; in addition, we determined the role of stromal cell-derived factor 1-α (SDF-1α) and C-X-C chemokine receptor type 4 (CXCR4) axis in the mutual interaction between DPSCs and HUVECs. Primarily isolated DPSCs showed mesenchymal stem cell- (MSC-) like characteristics. Moreover, DPSCs expressed perivascular markers such as NG2, α-smooth muscle actin (α-SMA), platelet-derived growth factor receptor β (PDGFRβ), and CD146. In vivo angiogenic capacity of DPSCs was demonstrated by in vivo Matrigel plug assay. We could observe microvessel-like structures in the coinjection of DPSCs and HUVECs at 7 days postinjection. To block SDF-1α and CXCR4 axis between DPSCs and HUVECs, AMD3100, a CXCR4 antagonist, was added into Matrigel plug. No significant microvessel-like structures were observed at 7 days postinjection. In conclusion, DPSCs have perivascular characteristics that contribute to in vivo angiogenesis. The findings of this study have potential applications in neovascularization of engineered tissues and vascular diseases.
Collapse
|
17
|
Grdović N, Rajić J, Petrović SM, Dinić S, Uskoković A, Mihailović M, Jovanović JA, Tolić A, Pucar A, Milašin J, Vidaković M. Association of CXCL12 gene promoter methylation with periodontitis in patients with diabetes mellitus type 2. Arch Oral Biol 2016; 72:124-133. [PMID: 27580404 DOI: 10.1016/j.archoralbio.2016.08.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 08/19/2016] [Accepted: 08/21/2016] [Indexed: 12/18/2022]
Abstract
OBJECTIVES CXCL12 is widely expressed, constitutive chemokine involved in tissue repair and regeneration, while the extent of its expression is important in various chronic inflammatory conditions. Involvement of DNA methylation in CXCL12 gene suppression (CXCL12) has been shown in malignancy and some autoimmune diseases. The aim of this study was to investigate whether the alterations in DNA methylation of CXCL12 are also involved in progression of periodontitis in combination with diabetes, as these chronic inflammatory conditions are strongly interrelated. DESIGN Study included 72 subjects divided in three groups: healthy control (C, n=21), periodontitis (P, n=29) and diabetes/periodontitis group (D/P, n=22). DNA extracted from epithelial cells obtained by sterile cotton swabs from buccal mucosa was subjected to methylation specific polymerase chain reaction (MSP) to obtain DNA methylation pattern of CXCL12 promoter. RESULTS CXCL12 promoter was predominantly unmethylated in all groups. However, increase in the frequency of the methylated form and increase in percent of methylation of CXCL12 promoter in periodontitis and diabetes/periodontitis group compared to control group were found, although without statistical significance. However, statistically significant increase in Tm of MSP products in diabetes/periodontitis group was observed. Correlation analysis revealed statistically significant relationship between the extent of DNA methylation of the CXCL12 promoter and periodontal parameters, as well as between DNA methylation of CXCL12 and glycosylated hemoglobin. CONCLUSION Presented results suggest that chronic inflammation contributes to the change of CXCL12 DNA methylation in buccal cells and that DNA methylation profile of CXCL12 promoter plays important role in development and progression of periodontal disease.
Collapse
Affiliation(s)
- Nevena Grdović
- Institute for Biological Research "Siniša Stanković", Department of Molecular Biology, University of Belgrade, Bulevar despota Stefana 142, 11000 Belgrade, Serbia
| | - Jovana Rajić
- Institute for Biological Research "Siniša Stanković", Department of Molecular Biology, University of Belgrade, Bulevar despota Stefana 142, 11000 Belgrade, Serbia
| | - Sanja Matić Petrović
- Department of Periodontology and Oral Medicine, School of Dental Medicine, University of Belgrade, Dr Subotica 8, 11000 Belgrade, Serbia
| | - Svetlana Dinić
- Institute for Biological Research "Siniša Stanković", Department of Molecular Biology, University of Belgrade, Bulevar despota Stefana 142, 11000 Belgrade, Serbia
| | - Aleksandra Uskoković
- Institute for Biological Research "Siniša Stanković", Department of Molecular Biology, University of Belgrade, Bulevar despota Stefana 142, 11000 Belgrade, Serbia
| | - Mirjana Mihailović
- Institute for Biological Research "Siniša Stanković", Department of Molecular Biology, University of Belgrade, Bulevar despota Stefana 142, 11000 Belgrade, Serbia
| | - Jelena Arambašić Jovanović
- Institute for Biological Research "Siniša Stanković", Department of Molecular Biology, University of Belgrade, Bulevar despota Stefana 142, 11000 Belgrade, Serbia
| | - Anja Tolić
- Institute for Biological Research "Siniša Stanković", Department of Molecular Biology, University of Belgrade, Bulevar despota Stefana 142, 11000 Belgrade, Serbia
| | - Ana Pucar
- Department of Periodontology and Oral Medicine, School of Dental Medicine, University of Belgrade, Dr Subotica 8, 11000 Belgrade, Serbia
| | - Jelena Milašin
- Institute of Human Genetics, School of Dental Medicine, University of Belgrade, Dr Subotica 8, 11000 Belgrade, Serbia
| | - Melita Vidaković
- Institute for Biological Research "Siniša Stanković", Department of Molecular Biology, University of Belgrade, Bulevar despota Stefana 142, 11000 Belgrade, Serbia.
| |
Collapse
|
18
|
Werle SB, Chagastelles P, Pranke P, Casagrande L. The effects of hypoxia on in vitro culture of dental-derived stem cells. Arch Oral Biol 2016; 68:13-20. [DOI: 10.1016/j.archoralbio.2016.03.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 03/18/2016] [Accepted: 03/20/2016] [Indexed: 12/19/2022]
|
19
|
Mead B, Logan A, Berry M, Leadbeater W, Scheven BA. Concise Review: Dental Pulp Stem Cells: A Novel Cell Therapy for Retinal and Central Nervous System Repair. Stem Cells 2016; 35:61-67. [PMID: 27273755 DOI: 10.1002/stem.2398] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 04/18/2016] [Accepted: 04/29/2016] [Indexed: 01/04/2023]
Abstract
Dental pulp stem cells (DPSC) are neural crest-derived ecto-mesenchymal stem cells that can relatively easily and non-invasively be isolated from the dental pulp of extracted postnatal and adult teeth. Accumulating evidence suggests that DPSC have great promise as a cellular therapy for central nervous system (CNS) and retinal injury and disease. The mode of action by which DPSC confer therapeutic benefit may comprise multiple pathways, in particular, paracrine-mediated processes which involve a wide array of secreted trophic factors and is increasingly regarded as the principal predominant mechanism. In this concise review, we present the current evidence for the use of DPSC to repair CNS damage, including recent findings on retinal ganglion cell neuroprotection and regeneration in optic nerve injury and glaucoma. Stem Cells 2017;35:61-67.
Collapse
Affiliation(s)
- Ben Mead
- School of Dentistry, Oral Biology, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom.,Neurotrauma and Neurobiology Research Group, School of Clinical and Experimental Medicine, University of Birmingham, Birmingham, United Kingdom
| | - Ann Logan
- Neurotrauma and Neurobiology Research Group, School of Clinical and Experimental Medicine, University of Birmingham, Birmingham, United Kingdom
| | - Martin Berry
- Neurotrauma and Neurobiology Research Group, School of Clinical and Experimental Medicine, University of Birmingham, Birmingham, United Kingdom
| | - Wendy Leadbeater
- Neurotrauma and Neurobiology Research Group, School of Clinical and Experimental Medicine, University of Birmingham, Birmingham, United Kingdom
| | - Ben A Scheven
- School of Dentistry, Oral Biology, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| |
Collapse
|
20
|
Fujio M, Xing Z, Sharabi N, Xue Y, Yamamoto A, Hibi H, Ueda M, Fristad I, Mustafa K. Conditioned media from hypoxic-cultured human dental pulp cells promotes bone healing during distraction osteogenesis. J Tissue Eng Regen Med 2015; 11:2116-2126. [PMID: 26612624 PMCID: PMC5516172 DOI: 10.1002/term.2109] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Revised: 10/07/2015] [Accepted: 10/15/2015] [Indexed: 02/06/2023]
Abstract
Distraction osteogenesis (DO) is a surgical procedure used to correct various skeletal disorders. Improving the technique by reducing the healing time would be of clinical relevance. The aim of this study was to determine the angiogenic and regenerative potential of conditioned media (CMs) collected from human dental pulp cells (hDPCs) grown under different culture conditions. CM collected from cells under hypoxia was used to improve bone healing and the DO procedure in vivo. The angiogenic potentials of CMs collected from hDPCs grown under normoxic (−Nor) and hypoxic (−Hyp) conditions were evaluated by quantitative PCR (VEGF‐A, angiopoietin‐1, angiopoietin‐2, interleukin‐6 (IL‐6) and CXCL12), ELISA assays (VEGF‐A, Ang‐2), tube‐formation and wound‐healing assays, using human umbilical vein endothelial cells. The results demonstrated that hypoxic CM had significantly higher angiogenic potential than normoxic CM. Human fetal osteoblasts (hFOBs) were exposed to CM, followed by alizarin red staining, to assess the osteogenic potential. It was found that CM did not enhance the mineralization capacity of hFOBs. DO was performed in the tibiae of 30 mice, followed by a local injection of 20 µl CM (CM–Nor and CM–Hyp groups) or serum‐free DMEM (control group) into the distraction zone every second day. The mice were sacrificed at days 13 and 27. The CM–Hyp treatment revealed a higher X‐ray density than the control group (p < 0.05). Our study suggests that the angiogenic effect promoted by hypoxic culture conditions is dependent on VEGF‐A and Ang‐2 released from hDPCs. Furthermore, CM–Hyp treatment may thus improve the DO procedure, accelerating bone healing. © 2015 The Authors. Journal of Tissue Engineering and Regenerative Medicine published by John Wiley & Sons, Ltd.
Collapse
Affiliation(s)
- Masahito Fujio
- Department of Clinical Dentistry, Centre for Clinical Dental Research, University of Bergen, Norway.,Department of Oral and Maxillofacial Surgery, Nagoya University Graduate School of Medicine, Japan
| | - Zhe Xing
- Department of Clinical Dentistry, Centre for Clinical Dental Research, University of Bergen, Norway
| | - Niyaz Sharabi
- Department of Clinical Dentistry, Centre for Clinical Dental Research, University of Bergen, Norway
| | - Ying Xue
- Department of Clinical Dentistry, Centre for Clinical Dental Research, University of Bergen, Norway
| | - Akihito Yamamoto
- Department of Oral and Maxillofacial Surgery, Nagoya University Graduate School of Medicine, Japan
| | - Hideharu Hibi
- Department of Oral and Maxillofacial Surgery, Nagoya University Graduate School of Medicine, Japan
| | - Minoru Ueda
- Department of Oral and Maxillofacial Surgery, Nagoya University Graduate School of Medicine, Japan
| | - Inge Fristad
- Department of Clinical Dentistry, Centre for Clinical Dental Research, University of Bergen, Norway
| | - Kamal Mustafa
- Department of Clinical Dentistry, Centre for Clinical Dental Research, University of Bergen, Norway
| |
Collapse
|
21
|
Vanacker J, Viswanath A, De Berdt P, Everard A, Cani PD, Bouzin C, Feron O, Diogenes A, Leprince JG, des Rieux A. Hypoxia modulates the differentiation potential of stem cells of the apical papilla. J Endod 2014; 40:1410-8. [PMID: 25146023 DOI: 10.1016/j.joen.2014.04.008] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Revised: 04/23/2014] [Accepted: 04/28/2014] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Stem cells from the apical papilla (SCAP) are a population of mesenchymal stem cells likely involved in regenerative endodontic procedures and have potential use as therapeutic agents in other tissues. In these situations, SCAP are exposed to hypoxic conditions either within a root canal devoid of an adequate blood supply or in a scaffold material immediately after implantation. However, the effect of hypoxia on SCAP proliferation and differentiation is largely unknown. Therefore, the objective of this study was to evaluate the effect of hypoxia on the fate of SCAP. METHODS SCAP were cultured under normoxia (21% O2) or hypoxia (1% O2) in basal or differentiation media. Cellular proliferation, gene expression, differentiation, and protein secretion were analyzed by live imaging, quantitative reverse-transcriptase polymerase chain reaction, cellular staining, and enzyme-linked immunosorbent assay, respectively. RESULTS Hypoxia had no effect on SCAP proliferation, but it evoked the up-regulation of genes specific for osteogenic differentiation (runt-related transcription factor 2, alkaline phosphatase, and transforming growth factor-β1), neuronal differentiation ( 2'-3'-cyclic nucleotide 3' phosphodiesterase, SNAIL, neuronspecific enolase, glial cell-derived neurotrophic factor and neurotrophin 3), and angiogenesis (vascular endothelial growth factor A and B). Hypoxia also increased the sustained production of VEGFa by SCAP. Moreover, hypoxia augmented the neuronal differentiation of SCAP in the presence of differentiation exogenous factors as detected by the up-regulation of NSE, VEGFB, and GDNF and the expression of neuronal markers (PanF and NeuN). CONCLUSIONS This study shows that hypoxia induces spontaneous differentiation of SCAP into osteogenic and neurogenic lineages while maintaining the release of the proangiogenic factor VEGFa. This highlights the potential of SCAP to promote pulp-dentin regeneration. Moreover, SCAP may represent potential therapeutic agents for neurodegenerative conditions because of their robust differentiation potential.
Collapse
Affiliation(s)
- Julie Vanacker
- Pharmaceutics and Drug Delivery Unit, Louvain Drug Research Institute, Université Catholique de Louvain, Brussels, Belgium.
| | - Aiswarya Viswanath
- Pharmaceutics and Drug Delivery Unit, Louvain Drug Research Institute, Université Catholique de Louvain, Brussels, Belgium
| | - Pauline De Berdt
- Pharmaceutics and Drug Delivery Unit, Louvain Drug Research Institute, Université Catholique de Louvain, Brussels, Belgium
| | - Amandine Everard
- Metabolism and Nutrition Research Group, WELBIO (Walloon Excellence in Life Sciences and BIOtechnology), Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
| | - Patrice D Cani
- Metabolism and Nutrition Research Group, WELBIO (Walloon Excellence in Life Sciences and BIOtechnology), Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
| | - Caroline Bouzin
- Pole of Pharmacology, Institute of Experimental and Clinical Research, Université Catholique de Louvain, Brussels, Belgium
| | - Olivier Feron
- Pole of Pharmacology, Institute of Experimental and Clinical Research, Université Catholique de Louvain, Brussels, Belgium
| | - Anibal Diogenes
- University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - Julian G Leprince
- Pharmaceutics and Drug Delivery Unit, Louvain Drug Research Institute, Université Catholique de Louvain, Brussels, Belgium
| | - Anne des Rieux
- Pharmaceutics and Drug Delivery Unit, Louvain Drug Research Institute, Université Catholique de Louvain, Brussels, Belgium
| |
Collapse
|
22
|
Yashiro Y, Nomura Y, Kanazashi M, Noda K, Hanada N, Nakamura Y. Function of chemokine (CXC motif) ligand 12 in periodontal ligament fibroblasts. PLoS One 2014; 9:e95676. [PMID: 24806431 PMCID: PMC4012992 DOI: 10.1371/journal.pone.0095676] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Accepted: 03/30/2014] [Indexed: 01/09/2023] Open
Abstract
The periodontal ligament (PDL) is one of the connective tissues located between the tooth and bone. It is characterized by rapid turnover. Periodontal ligament fibroblasts (PDLFs) play major roles in the rapid turnover of the PDL. Microarray analysis of human PDLFs (HPDLFs) and human dermal fibroblasts (HDFs) demonstrated markedly high expression of chemokine (CXC motif) ligand 12 (CXCL12) in the HPDLFs. CXCL12 plays an important role in the migration of mesenchymal stem cells (MSCs). The function of CXCL12 in the periodontal ligament was investigated in HPDLFs. Expression of CXCL12 in HPDLFs and HDFs was examined by RT-PCR, qRT-PCR and ELISA. Chemotactic ability of CXCL12 was evaluated in both PDLFs and HDFs by migration assay of MSCs. CXCL12 was also immunohistochemically examined in the PDL in vivo. Expression of CXCL12 in the HPDLFs was much higher than that in HDFs in vitro. Migration assay demonstrated that the number of migrated MSCs by HPDLFs was significantly higher than that by HDFs. In addition, the migrated MSCs also expressed CXCL12 and several genes that are familiar to fibroblasts. CXCL12 was immunohistochemically localized in the fibroblasts in the PDL of rat molars. The results suggest that PDLFs synthesize and secrete CXCL12 protein and that CXCL12 induces migration of MSCs in the PDL in order to maintain rapid turnover of the PDL.
Collapse
Affiliation(s)
- Yuichi Yashiro
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Yoshiaki Nomura
- Department of Translational Research, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Mikimoto Kanazashi
- Department of Periodontology, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Koji Noda
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Nobuhiro Hanada
- Department of Translational Research, School of Dental Medicine, Tsurumi University, Yokohama, Japan
| | - Yoshiki Nakamura
- Department of Orthodontics, School of Dental Medicine, Tsurumi University, Yokohama, Japan
- * E-mail:
| |
Collapse
|
23
|
Jiang L, Peng WW, Li LF, Du R, Wu TT, Zhou ZJ, Zhao JJ, Yang Y, Qu DL, Zhu YQ. Effects of deferoxamine on the repair ability of dental pulp cells in vitro. J Endod 2014; 40:1100-4. [PMID: 25069915 DOI: 10.1016/j.joen.2013.12.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Revised: 11/25/2013] [Accepted: 12/06/2013] [Indexed: 01/07/2023]
Abstract
INTRODUCTION In previous studies, we found that hypoxia promoted the mineralization of dental pulp cells (DPCs). However, the clinical application of hypoxia as a therapy is questionable or unfeasible. Deferoxamine (DFO), a medication for iron overload, has also been shown to induce hypoxia. The purpose of this study was to investigate the effects of DFO on the repair ability of DPCs. METHODS DPCs were obtained by using a tissue explant technique in vitro and were treated with different concentrations of DFO or hypoxia culture for 2 days. The viability, proliferation, migration, and odontogenic differentiation of DPCs were assayed and analyzed. The expression of hypoxia-inducible factor 1-alpha (HIF-1α) was assessed through Western blotting. RESULTS Ten micromolars of DFO enhanced the expression of HIF-1α similarly to hypoxia and did not affect the viability of DPCs for 2 days. Furthermore, the proliferation, migration, and odontogenic differentiation of DPCs were promoted by DFO. CONCLUSIONS These results suggest that DFO might improve the repair ability of DPCs by HIF-1α.
Collapse
Affiliation(s)
- Long Jiang
- Department of General Dentistry, 9th People's Hospital, Shanghai JiaoTong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China
| | - Wei-Wei Peng
- Department of General Dentistry, 9th People's Hospital, Shanghai JiaoTong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China
| | - Li-Fen Li
- Department of General Dentistry, 9th People's Hospital, Shanghai JiaoTong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China
| | - Rong Du
- Department of General Dentistry, 9th People's Hospital, Shanghai JiaoTong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China
| | - Tian-Tian Wu
- Department of General Dentistry, 9th People's Hospital, Shanghai JiaoTong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China
| | - Zhuo-Jun Zhou
- Department of General Dentistry, 9th People's Hospital, Shanghai JiaoTong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China
| | - Jun-Jun Zhao
- Department of General Dentistry, 9th People's Hospital, Shanghai JiaoTong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China
| | - Ya Yang
- Department of General Dentistry, 9th People's Hospital, Shanghai JiaoTong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China
| | - Dong-Lin Qu
- Department of General Dentistry, 9th People's Hospital, Shanghai JiaoTong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China
| | - Ya-Qin Zhu
- Department of General Dentistry, 9th People's Hospital, Shanghai JiaoTong University, School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China.
| |
Collapse
|
24
|
Garlet GP. To heal or not to heal? Chemokines as determinants of constructive or destructive inflammatory microenvironments. J Appl Oral Sci 2013; 21:S1678-77572013000200000. [PMID: 23739866 PMCID: PMC3881877 DOI: 10.1590/1678-77572013ed002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
25
|
Kim DS, Kim YS, Bae WJ, Lee HJ, Chang SW, Kim WS, Kim EC. The role of SDF-1 and CXCR4 on odontoblastic differentiation in human dental pulp cells. Int Endod J 2013; 47:534-41. [DOI: 10.1111/iej.12182] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Accepted: 08/12/2013] [Indexed: 01/02/2023]
Affiliation(s)
- D. S. Kim
- Department of Conservative Dentistry; School of Dentistry; Kyung Hee University; Seoul Korea
| | - Y. S. Kim
- Department of Maxillofacial Tissue Regeneration and Research Center for Tooth and Periodontal Regeneration (MRC); School of Dentistry; Kyung Hee University; Seoul Korea
| | - W. J. Bae
- Department of Maxillofacial Tissue Regeneration and Research Center for Tooth and Periodontal Regeneration (MRC); School of Dentistry; Kyung Hee University; Seoul Korea
| | - H. J. Lee
- Department of Maxillofacial Tissue Regeneration and Research Center for Tooth and Periodontal Regeneration (MRC); School of Dentistry; Kyung Hee University; Seoul Korea
| | - S. W. Chang
- Department of Conservative Dentistry; School of Dentistry; Kyung Hee University; Seoul Korea
| | - W. S. Kim
- Department of Periodontology; School of Dentistry; Wonkwang University; Iksan Korea
| | - E. C. Kim
- Department of Maxillofacial Tissue Regeneration and Research Center for Tooth and Periodontal Regeneration (MRC); School of Dentistry; Kyung Hee University; Seoul Korea
| |
Collapse
|
26
|
Chen W, Long KD, Lu M, Chaudhery V, Yu H, Choi JS, Polans J, Zhuo Y, Harley BAC, Cunningham BT. Photonic crystal enhanced microscopy for imaging of live cell adhesion. Analyst 2013; 138:5886-94. [PMID: 23971078 DOI: 10.1039/c3an01541f] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A form of microscopy that utilizes a photonic crystal biosensor surface as a substrate for cell attachment enables label-free, quantitative, submicron resolution, time-resolved imaging of cell-surface interactions without cytotoxic staining agents or temporally-unstable fluorophores. Other forms of microscopy do not provide this direct measurement of live cell-surface attachment localization and strength that includes unique, dynamic morphological signatures critical to the investigation of important biological phenomena such as stem cell differentiation, chemotaxis, apoptosis, and metastasis. Here, we introduce Photonic Crystal Enhanced Microscopy (PCEM), and apply it to the study of murine dental stem cells to image the evolution of cell attachment and morphology during chemotaxis and drug-induced apoptosis. PCEM provides rich, dynamic information about the evolution of cell-surface attachment profiles over biologically relevant time-scales. Critically, this method retains the ability to monitor cell behavior with spatial resolution sufficient for observing both attachment footprints of filopodial extensions and intracellular attachment strength gradients.
Collapse
Affiliation(s)
- Weili Chen
- Department of Electrical and Computer Engineering, Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, 208 North Wright Street, Urbana, IL 61801, USA.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
27
|
|
28
|
Adenosine Monophosphate–activated Protein Kinase/Mammalian Target of Rapamycin–dependent Autophagy Protects Human Dental Pulp Cells against Hypoxia. J Endod 2013; 39:768-73. [DOI: 10.1016/j.joen.2013.02.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2012] [Revised: 02/09/2013] [Accepted: 02/15/2013] [Indexed: 11/19/2022]
|
29
|
Wang MC, Hung PS, Tu HF, Shih WY, Li WC, Chang KW. Lipopolysaccharide Induces the Migration of Human Dental Pulp Cells by Up-regulating miR-146a. J Endod 2012; 38:1598-603. [DOI: 10.1016/j.joen.2012.09.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2012] [Revised: 09/04/2012] [Accepted: 09/10/2012] [Indexed: 01/01/2023]
|
30
|
Isolation and Identification of CXCR4-positive Cells from Human Dental Pulp Cells. J Endod 2012; 38:791-5. [DOI: 10.1016/j.joen.2012.02.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Revised: 02/23/2012] [Accepted: 02/24/2012] [Indexed: 01/09/2023]
|
31
|
Lipopolysaccharide-induced Stem Cell Factor Messenger RNA Expression and Production in Odontoblast-like Cells. J Endod 2012; 38:623-7. [DOI: 10.1016/j.joen.2011.10.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 10/19/2011] [Accepted: 10/26/2011] [Indexed: 11/16/2022]
|
32
|
Jiang L, Peng WW, Li LF, Yang Y, Zhu YQ. Proliferation and Multilineage Potential of CXCR4-positive Human Dental Pulp Cells In Vitro. J Endod 2012; 38:642-7. [DOI: 10.1016/j.joen.2011.12.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Revised: 12/16/2011] [Accepted: 12/19/2011] [Indexed: 12/27/2022]
|
33
|
Kuschel A, Simon P, Tug S. Functional regulation of HIF-1α under normoxia--is there more than post-translational regulation? J Cell Physiol 2012; 227:514-24. [PMID: 21503885 DOI: 10.1002/jcp.22798] [Citation(s) in RCA: 133] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The hypoxia-inducible factor-1 (HIF-1) is an oxygen-regulated transcriptional activator playing a pivotal role in mammalian physiology and disease pathogenesis, e.g., HIF-1 is indispensable in a broad range of developmental stages in different tumors. Its post-translational regulation via PHDs under the influence of hypoxia is widely investigated and accepted. Different non-hypoxic stimuli such as lipopolysaccharides (LPS), thrombin, and angiotensin II (Ang II), have been proven to enhance HIF-1 levels through activation of regulative mechanisms distinct from protein stabilization. Some of these stimuli specifically regulate HIF-1α at the transcriptional, post-transcriptional, or translational level, whereas others additionally influence post-translational modifications. Thus, it is difficult for the investigators to discern the impact of the different mechanisms leading to functional HIF-1 protein. Nevertheless, profound knowledge of additional regulatory networks appears to depict new therapeutic opportunities and thus is an interesting and important field for further investigations.
Collapse
Affiliation(s)
- A Kuschel
- Department of Sports Medicine, Rehabilitation and Disease Prevention, Johannes-Gutenberg-University Mainz, Germany
| | | | | |
Collapse
|
34
|
Qin W, Lin ZM, Deng R, Li DD, Song Z, Tian YG, Wang RF, Ling JQ, Zhu XF. p38a MAPK is involved in BMP-2-induced odontoblastic differentiation of human dental pulp cells. Int Endod J 2011; 45:224-33. [DOI: 10.1111/j.1365-2591.2011.01965.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
35
|
Morotomi T, Kitamura C, Toyono T, Okinaga T, Washio A, Saito N, Nishihara T, Terashita M, Anan H. Effects of Heat Stress and Starvation on Clonal Odontoblast-like Cells. J Endod 2011; 37:955-61. [DOI: 10.1016/j.joen.2011.03.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2010] [Revised: 03/29/2011] [Accepted: 03/31/2011] [Indexed: 10/18/2022]
|
36
|
Li L, Zhu YQ, Jiang L, Peng W, Ritchie HH. Hypoxia promotes mineralization of human dental pulp cells. J Endod 2011; 37:799-802. [PMID: 21787492 DOI: 10.1016/j.joen.2011.02.028] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2010] [Revised: 02/10/2011] [Accepted: 02/23/2011] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Dental pulp can be exposed to hypoxic conditions in case of trauma or inflammation. Dental pulp cells (DPCs) have mineralization potential, which plays a key role in pulp repair and reparative dentinogenesis process. Little information is available about DPC mineralization in hypoxic condition. The purpose of this study was to assess the influence of hypoxia on DPC mineralization to pave the way for a better understanding of dental pulp regeneration and reparative dentin formation. METHODS Human DPCs were obtained by using tissue explant technique in vitro and cultured in normoxia (20% O(2)) or hypoxia (5% O(2)). Cell viability was investigated by methyl-thiazol-tetrazolium assay. Cell mineralization was assessed by von Kossa staining and alizarin red S staining. Important mineral genes such as osteocalcin (OCN), dentin matrix acidic phosphoprotein-1 (DMP-1), bone sialoprotein (BSP), and dentin sialophosphoprotein (DSPP) were determined by real-time polymerase chain reaction. RESULTS Cell viability of DPCs increased more in hypoxia than in normoxia from day 3 to day 5. Von Kossa staining and alizarin red S staining showed DPCs in hypoxia had higher mineralization activity than in normoxia. Expression of mRNAs for OCN, DMP-1, BSP, and DSPP was greater in hypoxia than in normoxia. CONCLUSIONS These results imply that hypoxia promotes DPC mineralization.
Collapse
Affiliation(s)
- Lifen Li
- Department of General Dentistry, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai, China
| | | | | | | | | |
Collapse
|