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Wang TT, Jiang WR, Xu L, Zhou MY, Huang YS. Effect of blockage of Trem1 on the M1 polarization of macrophages in the regulation dental pulp inflammation. Eur J Oral Sci 2024; 132:e13018. [PMID: 39267299 DOI: 10.1111/eos.13018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Accepted: 08/22/2024] [Indexed: 09/17/2024]
Abstract
Dental pulp inflammation is a common and significant factor related to poor dental prognosis. Current treatment strategies primarily concentrate on managing the inflammatory response, with specific targets for intervention still under investigation. Triggering receptors expressed on myeloid cells (TREMs) are a group of receptor molecules extensively present on myeloid cell surfaces, crucial in the regulation of inflammatory process. Our analysis of transcriptomic sequencing data from clinical pulp samples of dataset GSE77459 and animal models revealed up-regulation of Trem1 during pulpitis. Administration of the Trem1-blocking peptide LP17 led to lower (more than 1-fold) levels of several pro-inflammatory factors and inhibition of M1 macrophage polarization both in vivo and in vitro. This study of the expression patterns and functions of Trem1 in the development of dental pulp inflammation provides novel insights into the therapeutic strategies for clinical pulpitis.
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Affiliation(s)
- Ting-Ting Wang
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Wen-Rui Jiang
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Li Xu
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Mei-Yun Zhou
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Yong-Song Huang
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
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Sampoerno G, Supriyanto E, Wahjuningrum DA, Larasati AA, Ardiani D, Surboyo MDC, Bhardwaj A, Ates AA. LPS-Induced Neuron Cell Apoptosis through TNF-α and Cytochrome c Expression in Dental Pulp. Eur J Dent 2024; 18:604-609. [PMID: 38049119 PMCID: PMC11132783 DOI: 10.1055/s-0043-1774329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/06/2023] Open
Abstract
OBJECTIVES Inflammation of the dental pulp tissue caused by bacteria, creating an immunology response of death of the dental pulp, is called apoptosis. The Porphyromonas gingivalis that cause apoptosis is lipopolysaccharide (LPS) through toll-like receptor (TLR) via two different mechanisms, intracellular and extracellular pathways. This study analyzed the role of LPS exposure of neuron cells, tumor necrosis factor-α (TNF-α), and cytochrome c (cyt-c) expression in the dental pulp to predict the possible mechanism of apoptosis. MATERIALS AND METHODS The lower tooth of Sprague Dawley rats was opened and exposed to LPS for 48 hours. Then the neuron cell analyzed histopathology using hematoxylin-eosin, whereas the TNF-α and cyt-c expression with indirect immunohistochemistry using a light microscope. The relationship between neuron cells with TNF-α and cyt-c was analyzed using stepwise regression linear analysis. RESULT The LPS exposure showed a lower number of neuron cells and had a relationship with TNF-α expression but not with cyt-c, while compared with control, both TNF-α and cyt-c expression were higher in neuron cells. CONCLUSION LPS exposure in dental pulp is possible to stimulate the apoptosis process through extracellular pathways marked by higher TNF-α expression.
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Affiliation(s)
- Galih Sampoerno
- Department of Conservative Dentistry, Faculty of Dental Medicine, Univeristas Airlangga, Surabaya, Indonesia
| | - Eddo Supriyanto
- Conservative Dentistry Specialist Program, Faculty of Dental Medicine, Univeristas Airlangga, Surabaya, Indonesia
| | - Dian Agustin Wahjuningrum
- Department of Conservative Dentistry, Faculty of Dental Medicine, Univeristas Airlangga, Surabaya, Indonesia
| | - Aghnia Alma Larasati
- Conservative Dentistry Specialist Program, Faculty of Dental Medicine, Univeristas Airlangga, Surabaya, Indonesia
| | - Dinda Ardiani
- Faculty of Dental Medicine, Universitas Airlangga, Surabaya, Indonesia
| | | | - Anuj Bhardwaj
- Department of Conservative Dentistry and Endodontic, Collage of Dental Science and Hospital, Rau, Indore, Madhya Pradesh, India
| | - Ayver Atav Ates
- Department of Endodontic, Faculty of Dentistry, Istinye University, Istanbul, Turkiye
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Pucinelli CM, da Silva RAB, Nelson-Filho P, Lima RB, Lucisano MP, Marchesan JT, da Silva LAB. The effects of NLRP3 inflammasome inhibition or knockout in experimental apical periodontitis induced in mice. Clin Oral Investig 2024; 28:285. [PMID: 38684528 DOI: 10.1007/s00784-024-05691-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Accepted: 04/24/2024] [Indexed: 05/02/2024]
Abstract
OBJECTIVE To evaluate the effects of NLRP3 inflammasome inhibition or knockout in experimental apical periodontitis (AP) induced in mice. METHODS The experimental AP was induced by pulpal exposure. To evaluate NLRP3-specific inhibitor medication (MCC950), WT mice received intraperitoneal injections, while the control received PBS (n = 10). In addition, to evaluate NLRP3 knockout, 35 wild-type (WT) and 35 NLRP3-/- mice were divided into a control group (without pulpal exposure, n = 5) and three experimental groups: after 2, 14 and 42 days after pulpal exposure (n = 10). Microscopic and molecular analyzes were carried out using a significance level of 5%. RESULTS Exposure to MCC950 did not affect the periapical lesion size after 14 days (P = 0.584). However, exposed mice had a lower expression of IL-1β, IL-18 and caspase-1 (P = 0.010, 0.016 and 0.002, respectively). Moreover, NLRP3-/- mice showed a smaller periapical lesion after 14 and 42 days (P = 0.023 and 0.031, respectively), as well as a lower expression of IL-1β after 42 days (P < 0.001), of IL-18 and caspase-1 after 14 (P < 0.001 and 0.035, respectively) and 42 days (P = 0.002 and 0.002, respectively). NLRP3-/- mice also showed a lower mRNA for Il-1β, Il-18 and Casp1 after 2 (P = 0.002, 0.036 and 0.001, respectively) and 14 days (P = 0.002, 0.002 and 0.001, respectively). CONCLUSIONS NLRP3 inflammasome inhibition or knockout can attenuate the inflammatory events that result in the periapical lesion (AP) formation after pulpal exposure in mice. CLINICAL RELEVANCE The NLRP3 inflammasome may be a therapeutic target for AP, and new approaches may verify the impact of its inhibition (through intracanal medications or filling materials) on the bone repair process and treatment success.
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Affiliation(s)
- Carolina Maschietto Pucinelli
- Department of Pediatric Dentistry (DCI), School of Dentistry of Ribeirão Preto, University of São Paulo (FORP/USP), Avenida do Café, s/n, Vila Monte Alegre, Ribeirão Preto, São Paulo, Brazil
| | - Raquel Assed Bezerra da Silva
- Department of Pediatric Dentistry (DCI), School of Dentistry of Ribeirão Preto, University of São Paulo (FORP/USP), Avenida do Café, s/n, Vila Monte Alegre, Ribeirão Preto, São Paulo, Brazil
- Graduate Program in Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Paulo Nelson-Filho
- Department of Pediatric Dentistry (DCI), School of Dentistry of Ribeirão Preto, University of São Paulo (FORP/USP), Avenida do Café, s/n, Vila Monte Alegre, Ribeirão Preto, São Paulo, Brazil
- Graduate Program in Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Ricardo Barbosa Lima
- Department of Pediatric Dentistry (DCI), School of Dentistry of Ribeirão Preto, University of São Paulo (FORP/USP), Avenida do Café, s/n, Vila Monte Alegre, Ribeirão Preto, São Paulo, Brazil.
- Graduate Program in Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.
| | - Marília Pacífico Lucisano
- Department of Pediatric Dentistry (DCI), School of Dentistry of Ribeirão Preto, University of São Paulo (FORP/USP), Avenida do Café, s/n, Vila Monte Alegre, Ribeirão Preto, São Paulo, Brazil
- Graduate Program in Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Julie Teresa Marchesan
- Department of Periodontology, School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Léa Assed Bezerra da Silva
- Department of Pediatric Dentistry (DCI), School of Dentistry of Ribeirão Preto, University of São Paulo (FORP/USP), Avenida do Café, s/n, Vila Monte Alegre, Ribeirão Preto, São Paulo, Brazil
- Graduate Program in Pediatric Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
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