1
|
Neural Regulations in Tooth Development and Tooth-Periodontium Complex Homeostasis: A Literature Review. Int J Mol Sci 2022; 23:ijms232214150. [PMID: 36430624 PMCID: PMC9698398 DOI: 10.3390/ijms232214150] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Revised: 11/10/2022] [Accepted: 11/14/2022] [Indexed: 11/19/2022] Open
Abstract
The tooth-periodontium complex and its nerves have active reciprocal regulation during development and homeostasis. These effects are predominantly mediated by a range of molecules secreted from either the nervous system or the tooth-periodontium complex. Different strategies mimicking tooth development or physiological reparation have been applied to tooth regeneration studies, where the application of these nerve- or tooth-derived molecules has been proven effective. However, to date, basic studies in this field leave many vacancies to be filled. This literature review summarizes the recent advances in the basic studies on neural responses and regulation during tooth-periodontium development and homeostasis and points out some research gaps to instruct future studies. Deepening our understanding of the underlying mechanisms of tooth development and diseases will provide more clues for tooth regeneration.
Collapse
|
2
|
Tabanez AP, de Campos Soriani Azevedo M, Melchiades JL, Fonseca AC, Francisconi CF, Colavite PM, Biguetti CC, de Oliveira Rodini Pegoraro C, Trombone APF, Garlet GP. FTY720 administration results in a M2 associated immunoregulatory effect that positively influences the outcome of alveolar bone repair outcome in mice. Bone 2022; 163:116506. [PMID: 35902072 DOI: 10.1016/j.bone.2022.116506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 07/18/2022] [Accepted: 07/20/2022] [Indexed: 11/02/2022]
Abstract
The alveolar bone repair process may be influenced by multiple local and systemic factors, which include immune system cells and mediators. Macrophages allegedly play important roles in the repair process, and the transition of an initial inflammatory M1 profile into a pro-reparative M2 profile theoretically contributes to a favorable repair outcome. In this context, considering immunoregulatory molecules as potential targets for improving bone repair, this study evaluated the role of the immunoregulatory molecule FTY720, previously described to favor the development of the M2 phenotype, in the process of alveolar bone healing in C57Bl/6 (WT) mice. Experimental groups submitted to tooth extraction and maintained under control conditions or treated with FTY720 were evaluated by microtomographic (μCT), histomorphometric, immunohistochemical and molecular analysis to characterize healing and host response features at 0, 1, 3, 7 and 14 days. Our results demonstrated that the FTY720 group presented higher bone tissue density, higher bone tissue volume, greater tissue volume fraction, greater number and thickness of trabeculae and a higher number of osteoblasts and osteoclasts than the control group. Accordingly, the bone markers BMP2, BMP7, ALPL, SOST and RANK mRNA expressions increased in the FTY720 treated group. Furthermore, the levels of FIZZ, ARG2 and IL-10 mRNA increased in the FTY720 group together with the presence of CD206+ cells, suggesting that the boost of bone formation mediated by FTY720 involves an increased polarization and activity of M2 macrophages in healing sites. Thus, our results demonstrate that FTY720 favored the process of alveolar bone repair, probably trough a strengthened M2 response, associated with an increased expression of markers osteogenic differentiation and activity markers. Immunoregulatory strategies based in the modulation of macrophage polarization profile can comprise effective tools to improve the bone repair process.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Cláudia Cristina Biguetti
- School of Dentistry of Bauru, University of São Paulo (FOB/USP), Bauru, SP, Brazil; Department of Bioengineering, The University of Texas at Dallas, Richardson, TX, United States of America
| | | | | | | |
Collapse
|
3
|
Azevedo MDCS, Fonseca AC, Colavite PM, Melchiades JL, Tabanez AP, Codo AC, de Medeiros AI, Trombone APF, Garlet GP. Macrophage Polarization and Alveolar Bone Healing Outcome: Despite a Significant M2 Polarizing Effect, VIP and PACAP Treatments Present a Minor Impact in Alveolar Bone Healing in Homeostatic Conditions. Front Immunol 2021; 12:782566. [PMID: 34992601 PMCID: PMC8724033 DOI: 10.3389/fimmu.2021.782566] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 11/29/2021] [Indexed: 12/20/2022] Open
Abstract
Host inflammatory immune response comprises an essential element of the bone healing process, where M2 polarization allegedly contributes to a favorable healing outcome. In this context, immunoregulatory molecules that modulate host response, including macrophage polarization, are considered potential targets for improving bone healing. This study aims to evaluate the role of the immunoregulatory molecules VIP (Vasoactive intestinal peptide) and PACAP (Pituitary adenylate cyclase activating polypeptide), which was previously described to favor the development of the M2 phenotype, in the process of alveolar bone healing in C57Bl/6 (WT) mice. Experimental groups were submitted to tooth extraction and maintained under control conditions or treated with VIP or PACAP were evaluated by microtomographic (µCT), histomorphometric, immunohistochemical, and molecular analysis at 0, 3, 7, and 14 days to quantify tissue healing and host response indicators at the healing site. Gene expression analysis demonstrates the effectiveness of VIP or PACAP in modulating host response, evidenced by the early dominance of an M2-type response, which was paralleled by a significant increase in M2 (CD206+) in treated groups. However, despite the marked effect of M1/M2 balance in the healing sites, the histomorphometric analysis does not reveal an equivalent/corresponding modulation of the healing process. µCT reveals a slight increase in bone matrix volume and the trabecular thickness number in the PACAP group, while histomorphometric analyzes reveal a slight increase in the VIP group, both at a 14-d time-point; despite the increased expression of osteogenic factors, osteoblastic differentiation, activity, and maturation markers in both VIP and PACAP groups. Interestingly, a lower number of VIP and PACAP immunolabeled cells were observed in the treated groups, suggesting a reduction in endogenous production. In conclusion, while both VIP and PACAP treatments presented a significant immunomodulatory effect with potential for increased healing, no major changes were observed in bone healing outcome, suggesting that the signals required for bone healing under homeostatic conditions are already optimal, and additional signals do not improve an already optimal process. Further studies are required to elucidate the role of macrophage polarization in the bone healing process.
Collapse
Affiliation(s)
| | - Angélica Cristina Fonseca
- Bauru School of Dentistry, Department of Biological Sciences, University of São Paulo, Bauru, Brazil
| | - Priscila Maria Colavite
- Bauru School of Dentistry, Department of Biological Sciences, University of São Paulo, Bauru, Brazil
| | - Jéssica Lima Melchiades
- Bauru School of Dentistry, Department of Biological Sciences, University of São Paulo, Bauru, Brazil
| | - André Petenuci Tabanez
- Bauru School of Dentistry, Department of Biological Sciences, University of São Paulo, Bauru, Brazil
| | - Ana Campos Codo
- School of Pharmaceutical Sciences, Department of Immunology, São Paulo State University, Araraquara, Brazil
| | - Alexandra Ivo de Medeiros
- School of Pharmaceutical Sciences, Department of Immunology, São Paulo State University, Araraquara, Brazil
| | | | | |
Collapse
|
4
|
Nagendrababu V, Kishen A, Murray PE, Nekoofar MH, de Figueiredo JAP, Priya E, Jayaraman J, Pulikkotil SJ, Jakovljevic A, Dummer PMH. PRIASE 2021 guidelines for reporting animal studies in Endodontology: explanation and elaboration. Int Endod J 2021; 54:858-886. [PMID: 33492704 DOI: 10.1111/iej.13481] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Accepted: 01/21/2021] [Indexed: 12/13/2022]
Abstract
Laws and ethics require that before conducting human clinical trials, a new material, device or drug may have to undergo testing in animals in order to minimize health risks to humans, unless suitable supporting grandfather data already exist. The Preferred Reporting Items for Animal Studies in Endodontology (PRIASE) 2021 guidelines were developed exclusively for the specialty of Endodontology by integrating and adapting the ARRIVE (Animals in Research: Reporting In Vivo Experiments) guidelines and the Clinical and Laboratory Images in Publications (CLIP) principles using a validated consensus-based methodology. Implementation of the PRIASE 2021 guidelines will reduce potential sources of bias and thus improve the quality, accuracy, reproducibility, completeness and transparency of reports describing animal studies in Endodontology. The PRIASE 2021 guidelines consist of a checklist with 11 domains and 43 individual items and a flowchart. The aim of the current document is to provide an explanation for each item in the PRIASE 2021 checklist and flowchart and is supplemented with examples from the literature in order for readers to understand their significance and to provide usage guidance. A link to the PRIASE 2021 explanation and elaboration document and PRIASE 2021 checklist and flowchart is available on the Preferred Reporting Items for study Designs in Endodontology (PRIDE) website (http://pride-endodonticguidelines.org/priase/).
Collapse
Affiliation(s)
- V Nagendrababu
- Department of Preventive and Restorative Dentistry, College of Dental Medicine, University of Sharjah, Sharjah, UAE
| | - A Kishen
- Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
| | - P E Murray
- Private Consultant, Fort Lauderdale, FL, USA
| | - M H Nekoofar
- Department of Endodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
| | | | - E Priya
- Division of Children and Community Oral Health, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia
| | - J Jayaraman
- Department of Developmental Dentistry, University of Texas Health School of Dentistry, San Antonio, TX, USA
| | - S J Pulikkotil
- Division of Clinical Dentistry, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia
| | - A Jakovljevic
- Department of Pathophysiology, School of Dental Medicine, University of Belgrade, Belgrade, Serbia
| | - P M H Dummer
- School of Dentistry, College of Biomedical and Life Sciences, Cardiff University, Cardiff, UK
| |
Collapse
|
5
|
Cavalla F, Letra A, Silva RM, Garlet GP. Determinants of Periodontal/Periapical Lesion Stability and Progression. J Dent Res 2020; 100:29-36. [PMID: 32866421 DOI: 10.1177/0022034520952341] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Periodontal and periapical lesions are infectious inflammatory osteolitytic conditions in which a complex inflammatory immune response mediates bone destruction. However, the uncertainty of a lesion's progressive or stable phenotype complicates understanding of the cellular and molecular mechanisms triggering lesion activity. Evidence from clinical and preclinical studies of both periodontal and periapical lesions points to a high receptor activator of NF-κB ligand/osteoprotegerin (RANKL/OPG) ratio as the primary determinant of osteolytic activity, while a low RANKL/OPG ratio is often observed in inactive lesions. Proinflammatory cytokines directly modulate RANKL/OPG expression and consequently drive lesion progression, along with pro-osteoclastogenic support provided by Th1, Th17, and B cells. Conversely, the cooperative action between Th2 and Tregs subsets creates an anti-inflammatory and proreparative milieu associated with lesion stability. Interestingly, the trigger for lesion status switch from active to inactive can originate from an unanticipated RANKL immunoregulatory feedback, involving the induction of Tregs and a host response outcome with immunological tolerance features. In this context, dendritic cells (DCs) appear as potential determinants of host response switch, since RANKL imprint a tolerogenic phenotype in DCs, described to be involved in both Tregs and immunological tolerance generation. The tolerance state systemically and locally suppresses the development of exacerbated and pathogenic responses and contributes to lesions stability. However, immunological tolerance break by comorbidities or dysbiosis could explain lesions relapse toward activity. Therefore, this article will provide a critical review of the current knowledge concerning periodontal and periapical lesions activity and the underlying molecular mechanisms associated with the host response. Further studies are required to unravel the role of immunological responsiveness or tolerance in the determination of lesion status, as well as the potential cooperative and/or inhibitory interplay among effector cells and their impact on RANKL/OPG balance and lesion outcome.
Collapse
Affiliation(s)
- F Cavalla
- Department of Conservative Dentistry, School of Dentistry, University of Chile, Santiago, Chile
| | - A Letra
- Department of Diagnostic and Biomedical Sciences, University of Texas Health Science Center School of Dentistry, Houston, TX, USA.,Center for Craniofacial Research, University of Texas Health Science Center School of Dentistry, Houston, TX, USA.,Pediatric Research Center, University of Texas Health Science Center at Houston McGovern Medical School, Houston, TX, USA
| | - R M Silva
- Center for Craniofacial Research, University of Texas Health Science Center School of Dentistry, Houston, TX, USA.,Pediatric Research Center, University of Texas Health Science Center at Houston McGovern Medical School, Houston, TX, USA.,Department of Endodontics, University of Texas Health Science Center School of Dentistry, Houston, TX, USA
| | - G P Garlet
- OSTEOimmunology Laboratory, Department of Biological Sciences, School of Dentistry of Bauru, São Paulo University-FOB/USP, Bauru, SP, Brazil
| |
Collapse
|
6
|
Azarpazhooh A, Diogenes AR, Fouad AF, Glickman GN, Kang MK, Kishen A, Levin L, Roda RS, Sedgley CM, Tay FR, Hargreaves KM. Insights into the October 2019 Issue of the Journal of Endodontics. J Endod 2019; 45:1173-1174. [PMID: 31522811 DOI: 10.1016/j.joen.2019.09.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Amir Azarpazhooh
- Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
| | - Anibal R Diogenes
- University of Texas Health San Antonio School of Dentistry, San Antonio, Texas
| | - Ashraf F Fouad
- University of North Carolina, Chapel Hill, North Carolina
| | | | - Mo K Kang
- University of California Los Angeles School of Dentistry, Los Angeles, California
| | - Anil Kishen
- Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
| | | | | | | | - Franklin R Tay
- Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
| | | |
Collapse
|