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Zhou S, Miao D, Wen J, Zhang Q, Hu D, Liu N, Li J, Zhang Y, Wang K, Chen Y. Microcin C7-laden modified gelatin based biocomposite hydrogel for the treatment of periodontitis. Int J Biol Macromol 2024; 258:128293. [PMID: 38000587 DOI: 10.1016/j.ijbiomac.2023.128293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 11/14/2023] [Accepted: 11/18/2023] [Indexed: 11/26/2023]
Abstract
Periodontitis is an oral disease with the highest incidence globally, and plaque control is the key to its treatment. In this study, Microcin C7 was used to treat periodontitis, and a novel injectable temperature-sensitive sustained-release hydrogel was synthesized as an environmentally sensitive carrier for drug delivery. First, modified gelatin was formed from gelatin and glycidyl methacrylate. Then, Microcin C7-laden hydrogel was formed from cross-linking with double bonds between modified gelatin, N-isopropyl acrylamide, and 2-Methacryloyloxyethyl phosphorylcholine through radical polymerization, and the model drug Microcin C7 was loaded by electrostatic adsorption. The hydrogel has good temperature sensitivity, self-healing, and injectable properties. In vitro results showed that the hydrogel could slowly and continuously release Microcin C7 with good biocompatibility and biodegradability, with a remarkable antibacterial effect on Porphyromonas gingivalis. It also confirmed the antibacterial and anti-inflammatory effects of Microcin C7-laden hydrogel in a periodontitis rat model. The results showed that Microcin C7-laden hydrogel is a promising candidate for local drug delivery systems in periodontitis.
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Affiliation(s)
- Shuo Zhou
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710061, China; Department of Periodontology, College of Stomatology, Xi'an Jiaotong University, Xi'an 710061, China; Department of Stomatology, Xi'an People's Hospital, Xi'an Fourth Hospital, Xi'an 710004, China
| | - Di Miao
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710061, China; Department of Periodontology, College of Stomatology, Xi'an Jiaotong University, Xi'an 710061, China
| | - Jinpeng Wen
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an 710061, China
| | - Qianqian Zhang
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710061, China; Department of Orthodontics, College of Stomatology, Xi'an Jiaotong University, Xi'an 710061, China
| | - Datao Hu
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an 710061, China
| | - Na Liu
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710061, China; Department of Periodontology, College of Stomatology, Xi'an Jiaotong University, Xi'an 710061, China
| | - Jinyang Li
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710061, China; Department of Periodontology, College of Stomatology, Xi'an Jiaotong University, Xi'an 710061, China
| | - Yifan Zhang
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710061, China; Department of Periodontology, College of Stomatology, Xi'an Jiaotong University, Xi'an 710061, China
| | - Ke Wang
- School of Pharmacy, Health Science Center, Xi'an Jiaotong University, Xi'an 710061, China.
| | - Yue Chen
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710061, China; Department of Periodontology, College of Stomatology, Xi'an Jiaotong University, Xi'an 710061, China.
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Feng Q, Song X, Liu L, Zhou X, Chen Z. Plasma serotonin precursors and metabolite are correlated with bone mineral density and bone turnover markers in patients with postmenopausal osteoporosis. J Orthop Surg (Hong Kong) 2024; 32:10225536231187181. [PMID: 38613416 DOI: 10.1177/10225536231187181] [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] [Indexed: 04/15/2024] Open
Abstract
BACKGROUND Serotonin (5-HT) precursors regulate bone remodeling. This study aims to investigate the correlation of plasma 5-HT precursors and metabolite with bone mineral density (BMD) and bone turnover markers in postmenopausal osteoporosis (PMOP) patients. METHODS The age, body mass index (BMI), and years since menopause (YSM) were documented for 348 postmenopausal women in normal/osteopenia/osteoporosis (OP) groups, with lumbar spine and femoral neck BMD measured. Serum bone turnover markers (PINP/β-CTX) and plasma 5-HT, 5-HT precursors (Trp/5-HTP) and metabolite (5-HIAA) were measured by ELISA. OP patients were allocated to high/low expression groups following ROC analysis of 5-HT/Trp/5-HTP/5-HIAA. The relationship of plasma 5-HT/Trp/5-HTP/5-HIAA, BMD, and bone turnover markers with PMOP was analyzed using logistic regression analysis. The correlation of plasma 5-HT/Trp/5-HTP/5-HIAA with BMD and bone turnover markers was analyzed using Pearson's correlation analysis, followed by logistic regression analysis of the relationship between plasma 5-HT/Trp/5-HTP/5-HIAA and BMD, bone turnover markers and PMOP. RESULTS BMI, YSM, BMD and PINP, and β-CTX levels differed among groups. Levels of plasma 5-HT precursors/metabolite were increased in OP patients. Individuals with high 5-HT precursors/metabolite levels had low BMD and high PINP/β-CTX levels. The 5-HT precursors/metabolite negatively-correlated with BMD and positively-correlated with PINP/β-CTX. BMI, YSM, BMD, and PINP/β-CTX/Trp/5-HTP/5-HT related to PMOP and were independent risk factors for OP. CONCLUSION Plasma 5-HT precursors and metabolite negatively-correlate with BMD and positively-correlate with PINP/β-CTX in PMOP patients. Peripheral 5-HT precursors and metabolite level may be a new direction of treatment of PMOP and bone metabolism-related disorders.
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Affiliation(s)
- Qinying Feng
- Central Laboratory, Beijing Jishuitan Hospital Guizhou Hospital, Guiyang, China
| | - Xiaoyu Song
- Central Laboratory, Beijing Jishuitan Hospital Guizhou Hospital, Guiyang, China
| | - Li Liu
- Department of Clinical Examination, Maternal and Child Health Hospital, Guiyang, China
| | - Xinzhong Zhou
- Central Laboratory, Beijing Jishuitan Hospital Guizhou Hospital, Guiyang, China
| | - Zhihao Chen
- Central Laboratory, Beijing Jishuitan Hospital Guizhou Hospital, Guiyang, China
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Moiseev D, Donskov S, Dubrovin I, Kulyukina M, Vasil’ev Y, Volel B, Shadieva S, Babaev A, Shevelyuk J, Utyuzh A, Velichko E, Dydykin S, Dydykina I, Paramonov Y, Faustova E. A New Way to Model Periodontitis in Laboratory Animals. Dent J (Basel) 2023; 11:219. [PMID: 37754339 PMCID: PMC10527576 DOI: 10.3390/dj11090219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 08/20/2023] [Accepted: 09/15/2023] [Indexed: 09/28/2023] Open
Abstract
The prevalence of periodontal diseases is increasing, tends to increase with age and is considered as one of the main causes of tooth loss. To assess the effectiveness of new methods of treatment of periodontal diseases, studies on laboratory animals can be promising. THE AIM OF THE STUDY to develop a new method of accelerated modeling of experimental periodontitis on laboratory animals. MATERIAL AND METHODS The study was carried out on 22 female rats. A wire ligature was applied to the cervical area of the incisors of the animals in an eight-shaped manner. Plaque obtained from a patient with periodontitis was placed under the wire, and nicotine and ethyl alcohol solutions were injected under the gingival mucosa. A complex index has been proposed to assess inflammation. At the end of the experiment the animals were euthanized, their jaws were dissected into dentoalveolar blocks and further descriptive histologic analysis was performed. RESULTS On the second day the gingiva of the rats acquired a cyanotic-pink color, on the fourth day the consistency of the gingiva became friable, mobility appeared in the lower incisors. Complex index of inflammation in animals of the main group: before the study-9, on the 7th day-195. Gingival preparations showed signs of exudative inflammation. In alveolar processes-irreversible resorption of bone structures. The difference of indicators in animals before and after the experiment was statistically significant (p < 0.05). CONCLUSION The new experimental model of periodontitis is reproduced in a short period of time, provides intensive development of inflammation, leads to disruption of the integrity of epithelial and connective tissue attachment, destruction of alveolar bone.
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Affiliation(s)
- Denis Moiseev
- N.I. Pirogov Russian National Research Medical University, Ostrovitianov Str. 1, 117997 Moscow, Russia; (D.M.)
| | - Sergey Donskov
- Tver State Medical University, Sovetskaya Str., 4, 170100 Tver, Russia; (S.D.); (I.D.)
| | - Ivan Dubrovin
- Tver State Medical University, Sovetskaya Str., 4, 170100 Tver, Russia; (S.D.); (I.D.)
| | - Mariya Kulyukina
- Tver State Medical University, Sovetskaya Str., 4, 170100 Tver, Russia; (S.D.); (I.D.)
| | - Yuriy Vasil’ev
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Trubetskaya Str., 8, p. 2, 119048 Moscow, Russia (E.V.)
| | - Beatrice Volel
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Trubetskaya Str., 8, p. 2, 119048 Moscow, Russia (E.V.)
| | - Shodiya Shadieva
- Bukhara State Medical Institute Named after Abu Ali ibn Sino, A.Navai Str. 1, Bukhara 200101, Uzbekistan
| | - Aleksey Babaev
- N.I. Pirogov Russian National Research Medical University, Ostrovitianov Str. 1, 117997 Moscow, Russia; (D.M.)
| | - Juliya Shevelyuk
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Trubetskaya Str., 8, p. 2, 119048 Moscow, Russia (E.V.)
| | - Anatolij Utyuzh
- N.A. Semashko National Research Institute of Public Health, Vorontsovo Pole Str., 12, Building 1, 105064 Moscow, Russia
| | - Ellina Velichko
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Trubetskaya Str., 8, p. 2, 119048 Moscow, Russia (E.V.)
| | - Sergey Dydykin
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Trubetskaya Str., 8, p. 2, 119048 Moscow, Russia (E.V.)
| | - Irina Dydykina
- V.A. Nasonova Research Institute of Rheumatology, 34A Kashirskoe Highway, 115522 Moscow, Russia
| | - Yuri Paramonov
- I.M. Sechenov First Moscow State Medical University (Sechenov University), Trubetskaya Str., 8, p. 2, 119048 Moscow, Russia (E.V.)
| | - Ekaterina Faustova
- N.I. Pirogov Russian National Research Medical University, Ostrovitianov Str. 1, 117997 Moscow, Russia; (D.M.)
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Gao J, Cai S, Wang Z, Li D, Ou M, Zhang X, Tian Z. The optimization of ligature/bone defect-induced periodontitis model in rats. Odontology 2022; 110:697-709. [PMID: 35654915 DOI: 10.1007/s10266-022-00715-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Accepted: 03/10/2022] [Indexed: 01/12/2023]
Abstract
The destruction of alveolar bone is a crucial manifestation of severe chronic periodontitis, which stem cell-based bioengineered therapies are expected to cure. Therefore, a cost-effective, reproducible, quantifiability and easier to administrate animal model that mimics human periodontitis is of great importance for further endeavor. In this study, we created periodontitis rat models in silk ligation group, bone defect group and bone defect/silk ligation group, respectively. Obvious periodontal inflammation but slight alveolar bone resorption was observed in the ligation group, while surgical trauma was not robust enough to continually worsen the constructed bone defect area in the bone defect group. In the bone defect/ligature group, significant and stable periodontal inflammation was the most enduring with similar evolving pathological patterns of human periodontitis. It also exhibited enhanced clinical similarity and confirmed its superiority in quantitativeness. The present rat model is the first study to reproduce a pathological process similar to human periodontitis with reliable stability and repeatability, manifesting a priority to previous methods. Day 9-12 is the best time for reproducing severe periodontitis syndromes with vertical bone resorption in this model.
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Affiliation(s)
- Jingyi Gao
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Shatainan Road, Baiyun District, Guangzhou, 510515, Guangdong, China
| | - Simin Cai
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Shatainan Road, Baiyun District, Guangzhou, 510515, Guangdong, China
| | - Zijie Wang
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Shatainan Road, Baiyun District, Guangzhou, 510515, Guangdong, China.,School of Stomatology, Southern Medical University, Guangzhou, Guangdong, China.,Hospital of Stomatology, Zunyi Medical University, Zunyi, Guizhou, People's Republic of China
| | - Dan Li
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Shatainan Road, Baiyun District, Guangzhou, 510515, Guangdong, China
| | - Minyi Ou
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Shatainan Road, Baiyun District, Guangzhou, 510515, Guangdong, China
| | - Xinlu Zhang
- Department of Cardiology, Nanfang Hospital, Southern Medical University, Guangzhou, China.
| | - Zhihui Tian
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Shatainan Road, Baiyun District, Guangzhou, 510515, Guangdong, China.
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Messer JG, La S, Kipp DE, Castillo EJ, Yarrow JF, Jorgensen M, Wnek RD, Kimmel DB, Aguirre JI. Diet-induced Generalized Periodontitis in Lewis Rats. Comp Med 2019; 69:384-400. [PMID: 31575381 DOI: 10.30802/aalas-cm-18-000113] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Periodontitis is an important public health concern worldwide. Because rodents from the genus Rattus are resistant to spontaneous periodontitis, experimental periodontitis must be initiated by mechanical procedures and interventions. Due to their exacerbated Th1 response and imbalanced Th17 regulatory T-cell responses, Lewis rats are highly susceptible to inducible inflammatory and autoimmune diseases. We hypothesized that feeding Lewis rats a diet high in sucrose and casein (HSC) would alter the oral microenvironment and induce inflammation and the development of periodontitis lesions without mechanical intervention. A baseline group (BSL, n = 8) was euthanized at age 6 wk. Beginning at 6 wk of age, 2 groups of Lewis rats were fed standard (STD, n = 12) or HSC (n = 20) chow and euthanized at 29 wk of age. We evaluated the degree of periodontitis through histology and μCT of maxillae and mandibles. The HSC-induced inflammatory response of periodontal tissues was assessed by using immunohistochemistry. Gene expression analysis of inflammatory cytokines associated with Th1 and Th17 responses, innate immunity cytokines, and tissue damage in response to bacteria were assessed also. The potential systemic effects of HSC diet were evaluated by assessing body composition and bone densitometry endpoints; serum leptin and insulin concentrations; and gene expression of inflammatory cytokines in the liver. Placing Lewis rats on HSC diet for 24 wk induced a host Th1-immune response in periodontal tissues and mild to moderate, generalized periodontitis characterized by inflammatory cell infiltration (predominantly T cells and macrophages), osteoclast resorption of alveolar bone, and hyperplasia and migration of the gingival epithelium. HSC-fed Lewis rats developed periodontitis without mechanical intervention in the oral cavity and in the absence of any noteworthy metabolic abnormalities. Consequently, the rat model we described here may be a promising approach for modeling mild to moderate periodontitis that is similar in presentation to the human disease.
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Affiliation(s)
- Jonathan G Messer
- Department of Physiological Sciences, University of Florida, Gainesville, Florida
| | - Stephanie La
- Department of Nutrition, University of North Carolina-Greensboro, Greensboro, North Carolina
| | - Deborah E Kipp
- Department of Nutrition, University of North Carolina-Greensboro, Greensboro, North Carolina
| | - Evelyn J Castillo
- Department of Physiological Sciences, University of Florida, Gainesville, Florida
| | - Joshua F Yarrow
- Department of Research Service, Veterans Affairs Medical Center, North Florida-South Georgia Veteran Health System, Gainesville, Florida
| | - Marda Jorgensen
- Department of Pediatrics, Division of Endocrinology, Diabetes, and Metabolism, College of Medicine, University of Florida, Gainesville, Florida
| | - Russell D Wnek
- Department of Research Service, Veterans Affairs Medical Center, North Florida-South Georgia Veteran Health System, Gainesville, Florida
| | - Donald B Kimmel
- Department of Physiological Sciences, University of Florida, Gainesville, Florida
| | - José Ignacio Aguirre
- Department of Physiological Sciences, University of Florida, Gainesville, Florida;,
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Kayacan Y, Yazar H, Cerit G, Ghojebeigloo BE. A new oxidative stress indicator: Effect of 5-hydroxytryptophan on thiol-disulfide homeostasis in exercise. Nutrition 2019; 63-64:114-119. [PMID: 30939385 DOI: 10.1016/j.nut.2019.01.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 01/22/2019] [Accepted: 01/23/2019] [Indexed: 12/14/2022]
Abstract
OBJECTIVES The aim of the present study was to evaluate the relationship between exercise and both 5-hydroxytryptophan and oxidative stress using thiol-disulfide homeostasis via what is likely a novel biomarker. METHODS Male albino Wistar rats (n = 32) were randomly divided into four groups as follows: control, exercise group, 5-hydroxytryptophan group (5H), and 5-HTP + exercise group (5Hex). Exercise and 5-HTP administration (25mg/kg per d) were performed 5d/wk for 10 wk. After completion of the experimental protocol, to determine oxidative stress parameters, serum total thiol and native thiol concentrations were measured. Dynamic disulfide status, reduced thiol, oxidized thiol (OT), and thiol oxidation reduction percentage ratios were compared between the groups. The methods used in the present study to measure dynamic thiol-disulfide homeostasis as calorimetric and duplex quantities were developed in 2014. These new methods are simple, reliable, and sensitive, with both high linearity and repeatability. RESULTS Compared with the control group, serum dynamic disulfide levels were significantly lower in the 5H group and highest in the control group. The lowest OT and the highest reduced thiol rates were determined to be in the 5H group. The highest OT value was found in the 5Hex group. Thiol oxidation reduction values were found to be highest in the 5H group and lowest in the 5Hex group. CONCLUSIONS Both 5-HTP and moderate exercise seem to be significantly effective in inhibiting oxidative damage. In addition, the new oxidative stress measurement method used in this study is a promising practical and useful method to evaluate and improve the performance of athletes.
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Affiliation(s)
- Yildirim Kayacan
- Ondokuz Mayıs University, Faculty of Yasar Dogu Sports Sciences, Samsun, Turkey.
| | - Hayrullah Yazar
- Sakarya University Faculty of Medicine, Department of Medical Biochemistry, Sakarya, Turkey
| | - Günay Cerit
- Ondokuz Mayıs University, Faculty of Yasar Dogu Sports Sciences, Samsun, Turkey
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Li X, Sun W, Li J, Wang M, Zhang H, Pei L, Boyce BF, Wang Z, Xing L. Clomipramine causes osteoporosis by promoting osteoclastogenesis via E3 ligase Itch, which is prevented by Zoledronic acid. Sci Rep 2017; 7:41358. [PMID: 28145497 PMCID: PMC5286409 DOI: 10.1038/srep41358] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 12/20/2016] [Indexed: 02/06/2023] Open
Abstract
Patients taking antidepressants, including Clomipramine (CLP), have an increased risk of osteoporotic fracture. However, the effects of CLP on bone metabolism are unknown. Here, we demonstrate that WT mice treated with CLP for 2 weeks had significantly reduced trabecular bone volume and cortical bone thickness, associated with increased osteoclast (OC) numbers, but had no change in osteoblast numbers or bone formation rate. Bone marrow cells from CLP-treated mice had normal OC precursor frequency, but formed significantly more OCs when they were cultured with RANKL and M-CSF. CLP promoted OC formation and bone resorption and expression of OC-associated genes. CLP-induced bone loss was prevented by Zoledronic acid. At the molecular level, CLP inhibited the activity of the ubiquitin E3 ligase Itch. CLP did not promote OC formation from bone marrow cells of Itch-/- mice in vitro nor induce bone loss in Itch-/- mice. Our findings indicate that CLP causes bone loss by enhancing Itch-mediated osteoclastogenesis, which was prevented by Zoledronic acid. Thus, anti-resorptive therapy could be used to prevent bone loss in patients taking antidepressants, such as CLP.
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Affiliation(s)
- Xing Li
- Department of Immuno-oncology, Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, China.,Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Wen Sun
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Jinbo Li
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Mengmeng Wang
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY 14642, USA.,Institute of Chinese Minority Traditional Medicine, MINZU University of China, Beijing 100081, China
| | - Hengwei Zhang
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Lingpeng Pei
- Institute of Chinese Minority Traditional Medicine, MINZU University of China, Beijing 100081, China
| | - Brendan F Boyce
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY 14642, USA.,Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY 14642, USA
| | - Zhiyu Wang
- Department of Immuno-oncology, Fourth Hospital of Hebei Medical University, Shijiazhuang 050011, China
| | - Lianping Xing
- Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY 14642, USA.,Center for Musculoskeletal Research, University of Rochester Medical Center, Rochester, NY 14642, USA
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Tyrovola JB. The "Mechanostat" Principle and the Osteoprotegerin-OPG/RANKL/RANK System PART II. The Role of the Hypothalamic-Pituitary Axis. J Cell Biochem 2017; 118:962-966. [PMID: 27862210 DOI: 10.1002/jcb.25793] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Accepted: 11/14/2016] [Indexed: 12/15/2022]
Abstract
Recent literature provides us with the indication that the ratio of OPG/RANKL concentrations fluctuate in a non-linear (bell-shaped) mode, according to Frost's "mechanostat" theory, during the application of mechanical strain. A similar cellular signal transduction mechanism to mechanical loading, that may also regulate bone resorptive activities, has nowdays been proposed. Since the skeleton is considered to be an endocrine organ, as such, it may likewise be subject to hypothalamic control. This central regulatory system may continually modulate the adaptation of the bone homeostatic system to external challenges. The hypothalamic-pituitary-gonadal axis may play a role in the regulation of OPG/RANKL secretion. The "mechanostat" principle may well characterize the oscillatory properties of the signal transduction mechanism that controls hard tissue metabolism and includes biochemical apart from mechanical stimuli. J. Cell. Biochem. 118: 962-966, 2017. © 2016 Wiley Periodicals, Inc.
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Influences of Fucoxanthin on Alveolar Bone Resorption in Induced Periodontitis in Rat Molars. Mar Drugs 2016; 14:md14040070. [PMID: 27043583 PMCID: PMC4849074 DOI: 10.3390/md14040070] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Revised: 03/16/2016] [Accepted: 03/24/2016] [Indexed: 01/17/2023] Open
Abstract
The aim of this study was to evaluate the effects of systemic fucoxanthin treatment on alveolar bone resorption in rats with periodontitis. Thirty rats were divided into control, experimental periodontitis (EP), and experimental periodontitis-fucoxanthin (EP-FUCO) groups. Periodontitis was induced by ligature for four weeks. After removal of the ligature, the rats in the EP-FUCO group were treated with a single dose of fucoxanthin (200 mg/kg bw) per day for 28 consecutive days. At the end of the study, all of the rats were euthanized and intracardiac blood and mandible tissue samples were obtained for biochemical, immunohistochemical, and histometric analyses. Fucoxanthin treatment resulted in a slight decrease in tumor necrosis factor-α, interleukin-1β, and interleukin-6 levels and a significant decrease in oxidative stress index. It was observed that fucoxanthin caused a significant reduction in receptor activator of nuclear factor kappa-β ligand (RANKL) levels and a statistically non-significant elevation in osteoprotegerin and bone-alkaline phosphatase levels. There were no significant differences in alveolar bone loss levels between the EP and EP-FUCO groups. This experimental study revealed that fucoxanthin provides a limited reduction in alveolar bone resorption in rats with periodontitis. One of the mechanisms underlying the mentioned limited effect might be related to the ability of fucoxanthin to inhibit oxidative stress-related RANKL-mediated osteoclastogenesis.
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