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Baxter SJ, Sydorak I, Ma PX, Hatch NE. Impact of pharmacologic inhibition of tooth movement on periodontal and tooth root tissues during orthodontic force application. Orthod Craniofac Res 2019; 23:35-43. [PMID: 31593373 DOI: 10.1111/ocr.12350] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 09/17/2019] [Accepted: 10/03/2019] [Indexed: 12/21/2022]
Abstract
OBJECTIVE The goal of this study was to investigate potential negative sequelae of orthodontic force application ±delivery of an osteoclast inhibitor, recombinant osteoprotegerin protein (OPG-Fc), on periodontal tissues. SETTING AND SAMPLE POPULATION Sprague Dawley rats from a commercial supplier were investigated in a laboratory setting. MATERIALS AND METHODS Rats were randomly divided into four groups (n = 7 each): one group with no orthodontic appliances and injected once prior to the experimental period with empty polymer microspheres, one group with orthodontic appliances and injected once with empty microspheres, one group with orthodontic appliances and injected once with polymer microspheres containing 1 mg/kg of OPG-Fc, and one group with orthodontic appliances and injected with non-encapsulated 5 mg/kg of OPG-Fc every 3 days during the experimental period. The animals were euthanized after 28 days of tooth movement for histomorphometric analyses. RESULTS Root resorption, PDL area and widths were similar in animals without appliances and animals with appliances plus high-dose OPG-Fc. PDL blood vessels were compressed and decreased in number in all animals that received orthodontic appliances, regardless of OPG-Fc. Hyalinization was significantly increased only in animals with orthodontic appliances plus multiple injections of 5 mg/kg non-encapsulated OPG-Fc when compared to animals without appliances. CONCLUSIONS Results of this study indicate that while pharmacological modulation of tooth movement through osteoclast inhibition is feasible when delivered in a locally controlled low-dose manner, high-dose levels that completely prevent tooth movement through bone may decrease local blood flow and increase the incidence of hyalinization.
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Affiliation(s)
- Sarah J Baxter
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - Inna Sydorak
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - Peter X Ma
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - Nan E Hatch
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
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Tay JYY, Bay BH, Yeo JF, Harris M, Meghji S, Dheen ST. Identification of RANKL in Osteolytic Lesions of the Facial Skeleton. J Dent Res 2016; 83:349-53. [PMID: 15044512 DOI: 10.1177/154405910408300415] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
RANKL (receptor activator of nuclear factor κB ligand) promotes osteoclast differentiation, stimulates osteoclast activity, and prolongs osteoclast survival and adherence to bone. Abnormalities of the RANKL/RANK/osteoprotegerin system have been implicated in a range of diseases, including osteoporosis. To date, no work has been done in osteolytic lesions of the facial skeleton. In this study, specimens of ameloblastomas, dentigerous cysts, odontogenic keratocysts, and radicular cysts were subjected to immunohistochemical analysis for RANKL and tartrate-resistant acid phosphatase (TRAP). Immunofluorescence staining for TRAP was visualized under confocal microscopy. All specimens demonstrated distinct positive immunoreactivity to RANKL and TRAP. The TRAP-positive cells also stained with in situ hybridization for human calcitonin receptor, a definitive marker for osteoclasts. Mononuclear pre-osteoclasts were observed to migrate from blood to the connective tissue stroma and multinucleate toward the bone surface. It can be concluded that RANKL plays a role in bone resorption in osteolytic lesions of the facial skeleton.
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Affiliation(s)
- J Y Y Tay
- Dept. of Oral and Maxillofacial Surgery, National Dental Centre, 5 Second Hospital Avenue, S168938, Singapore.
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Irie K, Ekuni D, Tomofuji T, Endo Y, Kasuyama K, Yaegaki K, Morita M. Combined Effects of Hydrogen Sulfide and Lipopolysaccharide on Osteoclast Differentiation in Rats. J Periodontol 2012; 83:522-7. [DOI: 10.1902/jop.2011.110315] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Ohnishi T, Okamoto A, Kakimoto K, Bandow K, Chiba N, Matsuguchi T. Involvement of Cot/Tp12 in Bone Loss during Periodontitis. J Dent Res 2010; 89:192-7. [DOI: 10.1177/0022034509353405] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Periodontitis causes resorption of alveolar bone, in which RANKL induces osteoclastogenesis. The binding of lipopolysaccharide to Toll-like receptors causes phosphorylation of Cot/Tp12 to activate the MAPK cascade. Previous in vitro studies showed that Cot/Tp12 was essential for the induction of RANKL expression by lipopolysaccharide. In this study, we examined whether Cot/Tp12 deficiency reduced the progression of alveolar bone loss and osteoclastogenesis during experimental periodontitis. We found that the extent of alveolar bone loss and osteoclastogenesis induced by ligature-induced periodontitis was decreased in Cot/Tp12-deficient mice. In addition, reduction of RANKL expression was observed in periodontal tissues of Cot/Tp12-deficient mice with experimental periodontitis. Furthermore, we found that Cot/Tp12 was involved in the induction of TNF-α mRNA expression in gingiva of mice with experimental periodontitis. Our observations suggested that Cot/Tp12 is essential for the progression of alveolar bone loss and osteoclastogenesis in periodontal tissue during experimental periodontitis mediated through increased RANKL expression.
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Affiliation(s)
- T. Ohnishi
- Division of Oral Biochemistry and
- Division of Orthodontics, Department of Developmental Medicine, Kagoshima University, Graduate School of Medical and Dental Sciences, 8 -35 -1 Sakuragaoka, 890–8544, Kagoshima, Japan
| | - A. Okamoto
- Division of Oral Biochemistry and
- Division of Orthodontics, Department of Developmental Medicine, Kagoshima University, Graduate School of Medical and Dental Sciences, 8 -35 -1 Sakuragaoka, 890–8544, Kagoshima, Japan
| | - K. Kakimoto
- Division of Oral Biochemistry and
- Division of Orthodontics, Department of Developmental Medicine, Kagoshima University, Graduate School of Medical and Dental Sciences, 8 -35 -1 Sakuragaoka, 890–8544, Kagoshima, Japan
| | - K. Bandow
- Division of Oral Biochemistry and
- Division of Orthodontics, Department of Developmental Medicine, Kagoshima University, Graduate School of Medical and Dental Sciences, 8 -35 -1 Sakuragaoka, 890–8544, Kagoshima, Japan
| | - N. Chiba
- Division of Oral Biochemistry and
- Division of Orthodontics, Department of Developmental Medicine, Kagoshima University, Graduate School of Medical and Dental Sciences, 8 -35 -1 Sakuragaoka, 890–8544, Kagoshima, Japan
| | - T. Matsuguchi
- Division of Oral Biochemistry and
- Division of Orthodontics, Department of Developmental Medicine, Kagoshima University, Graduate School of Medical and Dental Sciences, 8 -35 -1 Sakuragaoka, 890–8544, Kagoshima, Japan
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Tomofuji T, Ekuni D, Irie K, Azuma T, Endo Y, Tamaki N, Sanbe T, Murakami J, Yamamoto T, Morita M. Preventive effects of a cocoa-enriched diet on gingival oxidative stress in experimental periodontitis. J Periodontol 2009; 80:1799-808. [PMID: 19905949 DOI: 10.1902/jop.2009.090270] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
BACKGROUND Oxidative stress affects the progression of periodontitis. Cocoa is a rich source of flavonoids with antioxidant properties, which could suppress gingival oxidative stress in periodontal lesions. The purpose of the present study was to investigate the effects of a cocoa-enriched diet on gingival oxidative stress in a rat-periodontitis model. METHODS In this 4-week study, rats were divided into three groups (n = 8/group): a control group (fed a regular diet) and two periodontitis groups (fed a regular diet or cocoa-enriched diet [10% of food intake]). Periodontitis was induced by ligature placement around the mandibular first molars. Serum levels for reactive oxygen metabolites were measured at baseline and 2 and 4 weeks. At 4 weeks, the levels of 8-hydroxydeoxyguanosine and reduced/oxidized glutathione ratio were determined to evaluate gingival oxidative damage and antioxidant status, respectively. RESULTS Rats with experimental periodontitis that were fed a regular diet showed an increase in the level of serum reactive oxygen metabolites in a time-dependent manner. These rats also had an increased 8-hydroxydeoxyguanosine level and decreased reduced/oxidized glutathione ratio in the gingival tissue, inducing alveolar bone loss and polymorphonuclear leukocyte infiltration. Although experimental periodontitis was induced in the rats fed a cocoa-enriched diet, they did not show impairments in serum reactive oxygen metabolite level and gingival levels for 8-hydroxydeoxyguanosine and reduced/oxidized glutathione ratio. Alveolar bone loss and polymorphonuclear leukocyte infiltration after ligature placement were also inhibited by cocoa intake. CONCLUSION Consuming a cocoa-enriched diet could diminish periodontitis-induced oxidative stress, which, in turn, might suppress the progression of periodontitis.
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Affiliation(s)
- Takaaki Tomofuji
- Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan
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Gallina S, Barranco-Piedra S, Torres-Lagares D, Baroukh B, Llorens A, Gutiérrez-Pérez JL, Saffar JL, Cherruau M, Lesclous P. Estrogen Withdrawal Transiently Increased Bone Turnover Without Affecting the Bone Balance Along the Tooth Socket in Rats. J Periodontol 2009; 80:2035-44. [DOI: 10.1902/jop.2009.090297] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Irie K, Ekuni D, Yamamoto T, Morita M, Yaegaki K, Ii H, Imai T. A single application of hydrogen sulphide induces a transient osteoclast differentiation with RANKL expression in the rat model. Arch Oral Biol 2009; 54:723-9. [DOI: 10.1016/j.archoralbio.2009.05.006] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2009] [Revised: 05/04/2009] [Accepted: 05/14/2009] [Indexed: 02/08/2023]
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Neves J, Salmon C, Omar N, Narvaes E, Gomes J, Novaes P. Immunolocalization of CSF-1, RANKL and OPG in the enamel-related periodontium of the rat incisor and their implications for alveolar bone remodeling. Arch Oral Biol 2009; 54:651-7. [DOI: 10.1016/j.archoralbio.2009.04.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2008] [Revised: 03/17/2009] [Accepted: 04/07/2009] [Indexed: 11/26/2022]
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Yang L, Zhang C, Peng B. Immunolocalization of Tumor Necrosis Factor Receptor–Associated Factor 6 in Rat Periapical Lesions. J Endod 2009; 35:834-7. [DOI: 10.1016/j.joen.2009.03.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2009] [Revised: 03/07/2009] [Accepted: 03/15/2009] [Indexed: 10/20/2022]
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Tomofuji T, Ekuni D, Sanbe T, Irie K, Azuma T, Maruyama T, Tamaki N, Murakami J, Kokeguchi S, Yamamoto T. Effects of vitamin C intake on gingival oxidative stress in rat periodontitis. Free Radic Biol Med 2009; 46:163-8. [PMID: 18983910 DOI: 10.1016/j.freeradbiomed.2008.09.040] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2008] [Revised: 09/08/2008] [Accepted: 09/25/2008] [Indexed: 11/18/2022]
Abstract
Increased levels of oxidative stress due to excessive production of reactive oxygen species are involved in the pathogenesis of periodontitis. Studies suggest a negative association between plasma vitamin C level and the severity of periodontitis. We hypothesized that increases in plasma vitamin C levels after vitamin C intake might clinically reduce gingival oxidative stress in a rat periodontitis model. A ligature was placed around rat mandibular molars for 4 weeks to induce periodontitis, and the rats were then given drinking water with or without 1 g/L vitamin C for 2 weeks after the ligature was removed. The periodontitis-induced rats showed a 149% increase in 8-hydroxydeoxyguanosine level and a 40% decrease in reduced:oxidized glutathione ratio in gingival tissue. Vitamin C intake induced a 175% increase in plasma vitamin C level, resulting in an improvement in the gingival 8-hydroxydeoxyguanosine level (decreased) and in the reduced:oxidized glutathione ratio (increased). Furthermore, in ligature-induced periodontitis lesions, gene expression encoding inflammation, including interleukin-1 alpha and interleukin-1 beta, was more than twofold down-regulated by vitamin C intake. The results suggest that systemic administration of vitamin C could be clinically beneficial in improving periodontitis-induced oxidative stress by down-regulating inflammatory gene expression.
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Affiliation(s)
- Takaaki Tomofuji
- Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Okayama 700-8525, Japan
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Sanbe T, Tomofuji T, Ekuni D, Azuma T, Irie K, Tamaki N, Yamamoto T, Morita M. Vitamin C intake inhibits serum lipid peroxidation and osteoclast differentiation on alveolar bone in rats fed on a high-cholesterol diet. Arch Oral Biol 2008; 54:235-40. [PMID: 19110235 DOI: 10.1016/j.archoralbio.2008.11.001] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2008] [Revised: 09/24/2008] [Accepted: 11/02/2008] [Indexed: 11/15/2022]
Abstract
OBJECTIVE A high-cholesterol diet stimulates osteoclast differentiation, which may be induced by increased serum lipid peroxidation. The inhibition of serum lipid peroxidation by vitamin C may offer beneficial effects on osteoclast differentiation including increased expression of receptor activator of nuclear factor (NF)-kappaB ligand (RANKL) and NF-kappaB. This study investigated the effects of vitamin C intake on RANKL and NF-kappaB expression in periodontal tissue of rats fed a high-cholesterol diet. DESIGN Twenty-four rats (8 weeks old) were divided into four groups: a control group (fed a regular diet) and three experimental groups (fed a high-cholesterol diet supplemented with 0, 1 and 2 g/l vitamin C/day) in this 12-week study. Vitamin C was provided by its addition to drinking water. As an index of serum lipid peroxidation, hexanoyl-lysine (HEL) level was determined by a competitive enzyme-linked immunosorbent assay method. Immunohistological analysis was performed to evaluate RANKL and NF-kappaB expression on the alveolar bone surface. The number of tartrate-resistant acid phosphatase (TRAP)-positive osteoclasts was also counted. RESULTS Feeding a high-cholesterol diet increased not only the serum HEL level but also the number of TRAP-positive osteoclasts on the alveolar bone surface, with an increase in RANKL and NF-kappaB expression on alveolar bone surface. Intake of vitamin C reduced the serum HEL level and osteoclast differentiation, with decreasing RANKL and NF-kappaB expression. CONCLUSIONS Vitamin C intake could suppress osteoclast differentiation, including RANKL and NF-kappaB expression on the alveolar bone surface, by decreasing serum lipid peroxidation in rats fed a high-cholesterol diet.
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Affiliation(s)
- Toshihiro Sanbe
- Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Okayama 700-8525, Japan
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Sanbe T, Tomofuji T, Ekuni D, Azuma T, Tamaki N, Yamamoto T. Oral administration of vitamin C prevents alveolar bone resorption induced by high dietary cholesterol in rats. J Periodontol 2008; 78:2165-70. [PMID: 17970684 DOI: 10.1902/jop.2007.070181] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND A high-cholesterol diet stimulates alveolar bone resorption, which may be induced via tissue oxidative damage. Vitamin C reduces tissue oxidative damage by neutralizing free radicals and scavenging hydroxyl radicals, and its antioxidant effect may offer the clinical benefit of preventing alveolar bone resorption in cases of hyperlipidemia. We examined whether vitamin C could suppress alveolar bone resorption in rats fed a high-cholesterol diet. METHODS In this 12-week study, rats were divided into four groups: a control group (fed a regular diet) and three experimental groups (fed a high-cholesterol diet supplemented with 0, 1, or 2 g/l vitamin C). Vitamin C was provided by adding it to the drinking water. The bone mineral density of the alveolar bone was analyzed by microcomputerized tomography. As an index of tissue oxidative damage, the 8-hydroxydeoxyguanosine level in the periodontal tissue was determined using a competitive enzyme-linked immunosorbent assay. RESULTS Hyperlipidemia, induced by a high-cholesterol diet, decreased rat alveolar bone density and increased the number of tartrate-resistant acid phosphatase-positive osteoclasts. The expression of 8-hydroxydeoxyguanosine was upregulated in the periodontal tissues. Intake of vitamin C reduced the effect of a high-cholesterol diet on alveolar bone density and osteoclast differentiation and decreased periodontal 8-hydroxydeoxyguanosine expression. CONCLUSION In the rat model, vitamin C suppressed alveolar bone resorption, induced by high dietary cholesterol, by decreasing the oxidative damage of periodontal tissue.
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Affiliation(s)
- Toshihiro Sanbe
- Department of Oral Health, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
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Correlation between the Expression of c-Fos and Osteoclasts in Induced Periapical Lesions in Rats. J Endod 2008; 34:22-5. [DOI: 10.1016/j.joen.2007.07.034] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2007] [Revised: 07/18/2007] [Accepted: 07/20/2007] [Indexed: 11/17/2022]
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Kelleher FC, McKenna M, Collins C, Brady G, Collins I, Crown J. Bisphosphonate induced osteonecrosis of the jaws: unravelling uncertainty in disease causality. Acta Oncol 2007; 46:702-4. [PMID: 17562449 DOI: 10.1080/02841860600979021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Watanabe T, Okafuji N, Nakano K, Shimizu T, Muraoka R, Kurihara S, Yamada K, Kawakami T. Periodontal Tissue Reaction to Mechanical Stress in Mice. J HARD TISSUE BIOL 2007. [DOI: 10.2485/jhtb.16.71] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Kim T, Handa A, Iida J, Yoshida S. RANKL expression in rat periodontal ligament subjected to a continuous orthodontic force. Arch Oral Biol 2006; 52:244-50. [PMID: 17101113 DOI: 10.1016/j.archoralbio.2006.10.003] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2006] [Revised: 09/28/2006] [Accepted: 10/04/2006] [Indexed: 02/04/2023]
Abstract
OBJECTIVES This study investigated longitudinal changes in receptor activator NF kappa B ligand (RANKL) expression in periodontal ligament (PDL) cells subjected to a continuous orthodontic force. DESIGN Fifty-five-day-old male Wistar rats were divided into experimental and control groups. The experimental group had the first molars laterally expanded by a continuous orthodontic force. In each group, the horizontal section specimens were embedded in OTC compound and frozen at 0, 1, 3 and 7 days after the expansion. Sections were observed by immunostaining with anti-RANKL and the tartrate-resistant acid phosphatase (TRAP) staining. RESULT Immunoreaction of RANKL and TRAP-positive cells were observed in the distal region of the controls and on the compressed side of the expansion group in the 3 and 7 days. Immunoreaction of RANKL was also observed after 1 day on the compression side of the expansion group, but here TRAP-positive cells were few. CONCLUSIONS The experiments have showed that PDL cells are continuously producing RANKL on the PDL pressure side of rats subjected to mechanical stress with a continuous orthodontic force, there was no noticeable the excessive appearance of osteoclasts however. Considering this, it is expected that not only RANKL production but also other cytokines play an important role in the balancing adjustment in the alveolar bone remodeling.
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Affiliation(s)
- Takenori Kim
- Department of Orthodontics, Division of Oral Functional Science, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan.
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Abstract
The purpose of this study is to observe the immunohistochemical localization of Receptor Activator of NF Kappa B Ligand (RANKL) in the rat periapical lesions. Periapical lesions were induced in Sprague-Dawley (SD) rats by occlusal exposure of the pulp of their mandibular first molars. Animals were sacrificed randomly at 0, 7, 14, 21, and 28 days after the exposure and their mandibles were removed, demineralized, and embedded in paraffin. Frontal sections in the region of the first molar were prepared for enzyme histochemistry and immunohistochemistry. Tartrate-resistant acid phosphatase (TRAP)-positive cells and RANKL-positive cells could be observed on day 7. From day 7 to day 14, increasing amounts of inflammatory infiltration and alveolar bone resorption were observed in the periapical region. The expression and number of TRAP-positive cells and RANKL-positive cells were climaxed on day 14. In the 21- and 28-day samples, the expression of RANKL decreased and fewer TRAP-positive cells could be observed. These findings demonstrated that RANKL could be observed, which may be associated with the pathogenesis of periapical lesions.
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Affiliation(s)
- Xiaolei Zhang
- Department of Conservative Dentistry and Endodontics, School of Stomatology Wuhan University, Wuhan City, China
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Influence of Occlusal Stimuli on the Remodelling of Alveolar Bone in a Rat Hypofunction-Recovery Model. J Oral Biosci 2005. [DOI: 10.1016/s1349-0079(05)80015-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Zhang D, Goetz W, Braumann B, Bourauel C, Jaeger A. Effect of soluble receptors to interleukin-1 and tumor necrosis factor alpha on experimentally induced root resorption in rats. J Periodontal Res 2003; 38:324-32. [PMID: 12753372 DOI: 10.1034/j.1600-0765.2003.00410.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
OBJECTIVE In this study, the role of the inflammatory cytokines interleukin-1 (IL-1) and tumor necrosis factor alpha (TNFalpha) in the course of mechanically induced root resorption was investigated. METHODS Mechanical induction of root resorption was performed on the upper left first molars in 18 male Wistar rats according to the method of Nakane and Kameyama. Starting on day minus 1, six animals received daily intraperitoneal injections of 2 ml of 1 micro g/ml soluble receptors to IL-1 (sIL-1RII) and another six animals were administered the same dose of soluble receptors to TNFalpha (sTNFalpha-RI). Six animals served as a control. On d 7 the left maxillae were prepared for histological and morphometric analysis of the extent of the root resorption that had developed. RESULTS The qualitative and quantitative results demonstrated that in both receptor groups the amount of root resorption was significantly reduced. Especially following systemic application of sTNFalpha-RI, root resorption was nearly completely prevented. CONCLUSIONS Our results indicate that IL-1 and more particularly TNFalpha are important for the induction and the further process of mechanically induced root resorption in the rat.
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Affiliation(s)
- Dongliang Zhang
- Jilin University, Dental School, Department of Orthodontics, Jilin, People's Republic of China
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