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Aono Y, Saito K, Kawashima H, Watanabe A, Kono T, Hashizume-Takizawa T, Okada H, Kosuge Y, Senpuku H, Waddington JL, Saigusa T. Lipopolysaccharides derived from Porphyromonas gingivalis and Escherichia coli: Differential and interactive effects on novelty-induced hyperlocomotion, blood cytokine levels and TLR4-related processes. PLoS One 2024; 19:e0292830. [PMID: 38857232 PMCID: PMC11164397 DOI: 10.1371/journal.pone.0292830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Accepted: 05/01/2024] [Indexed: 06/12/2024] Open
Abstract
Lipopolysaccharide (LPS), a component of the Gram-negative bacterial cell wall, activates Toll-like receptors (TLRs). Porphyromonas gingivalis (Pg) may be involved in the progression of periodontal disease. Mice exposed to a novel environment show hyperlocomotion that is inhibited by systemic administration of LPS derived from Escherichia coli (Ec-LPS). However, whether Pg-LPS influences novelty-induced locomotion is unknown. Accordingly, we carried out an open field test to analyse the effects of Pg-LPS. For comparison, effects of Ec-LPS were also studied. We additionally investigated the influence of systemic administration of Pg-LPS or Ec-LPS on IL-6, TNF-alpha, and IL-10 levels in blood, as they could be involved in the changes in locomotion. The TLR4 receptor antagonist TAK-242 was used to study the involvement of TLR4. Since Pg-LPS may block TLR4 in vitro, we analysed the effects of Pg-LPS on Ec-LPS-induced changes in behavioural and biochemical parameters. Male ddY mice were used. Pg- or Ec-LPS and TAK-242 were administered intraperitoneally. Ec-LPS (840 μg/kg), but not Pg-LPS (100, 500 and 840 μg/kg), inhibited novelty-induced locomotion, which was antagonized by TAK-242 (3.0 mg/kg). Ec-LPS (840 μg/kg) increased blood levels of IL-6 and IL-10, which were antagonized by TAK-242 (3.0 mg/kg). However, TAK-242 did not inhibit Ec-LPS-induced increases in TNF-alpha levels in blood. Pg-LPS (100, 500, and 840 μg/kg) did not alter blood IL-6, TNF-alpha, or IL-10 levels. The Ec-LPS-induced increase in blood IL-10, but not IL-6 and TNF-alpha, levels was inhibited by Pg-LPS (500 μg/kg). These results suggest that TLR4 stimulation mediates the inhibition of novel environment-induced locomotion in mice following systemic administration of Ec-LPS, while also increasing blood IL-6 and IL-10 levels. In contrast, Pg-LPS did not exhibit these effects. The present study also provides in vivo evidence that Pg-LPS can inhibit TLR4-mediated increases in blood levels of IL-10, a cytokine thought to prevent the development of periodontal disease.
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Affiliation(s)
- Yuri Aono
- Department of Pharmacology, Nihon University School of Dentistry at Matsudo, Sakaecho-Nishi, Matsudo, Chiba, Japan
| | - Koji Saito
- Nihon University Graduate School of Dentistry at Matsudo, Oral Molecular Pharmacology, Sakaecho-Nishi, Matsudo, Chiba, Japan
| | - Hiroki Kawashima
- Department of Pharmacology, Nihon University School of Dentistry at Matsudo, Sakaecho-Nishi, Matsudo, Chiba, Japan
| | - Arata Watanabe
- Department of Histology, Nihon University School of Dentistry at Matsudo, Sakaecho-Nishi, Matsudo, Chiba, Japan
| | - Tetsuro Kono
- Department of Histology, Nihon University School of Dentistry at Matsudo, Sakaecho-Nishi, Matsudo, Chiba, Japan
| | - Tomomi Hashizume-Takizawa
- Department of Microbiology and Immunology, Nihon University School of Dentistry at Matsudo, Sakaecho-Nishi, Matsudo, Chiba, Japan
| | - Hiroyuki Okada
- Department of Histology, Nihon University School of Dentistry at Matsudo, Sakaecho-Nishi, Matsudo, Chiba, Japan
| | - Yasuhiro Kosuge
- Laboratory of Pharmacology, Nihon University School of Pharmacy, Narashinodai, Funabashi, Chiba, Japan
| | - Hidenobu Senpuku
- Department of Microbiology and Immunology, Nihon University School of Dentistry at Matsudo, Sakaecho-Nishi, Matsudo, Chiba, Japan
| | - John L. Waddington
- School of Pharmacy and Biomolecular Sciences, RCSI University of Medicine and Health Sciences, St. Stephen’s Green, Dublin, Ireland
| | - Tadashi Saigusa
- Department of Pharmacology, Nihon University School of Dentistry at Matsudo, Sakaecho-Nishi, Matsudo, Chiba, Japan
- Nihon University Graduate School of Dentistry at Matsudo, Oral Molecular Pharmacology, Sakaecho-Nishi, Matsudo, Chiba, Japan
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Sadeghi S, Kalhor H, Panahi M, Abolhasani H, Rahimi B, Kalhor R, Mehrabi A, Vahdatinia M, Rahimi H. Keratinocyte growth factor in focus: A comprehensive review from structural and functional aspects to therapeutic applications of palifermin. Int J Biol Macromol 2021; 191:1175-1190. [PMID: 34606789 DOI: 10.1016/j.ijbiomac.2021.09.151] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 09/21/2021] [Accepted: 09/22/2021] [Indexed: 11/29/2022]
Abstract
Palifermin (Kepivance™) is the first therapeutic approved by the Food and Drug Administration for preventing and managing the oral mucositis provoked by myelotoxic and mucotoxic therapies. Palifermin is a recombinant protein generated from human keratinocyte growth factor (KGF) and imitates the function of endogenous KGF. KGF is an epithelial mitogen involved in various biological processes which belongs to the FGF family. KGF possesses a high level of receptor specificity and plays an important role in tissue repair and maintaining of the mucosal barrier integrity. Based on these unique features, palifermin was developed to enhance the growth of damaged epithelial tissues. Administration of palifermin has shown success in the reduction of toxicities of chemotherapy and radiotherapy, and improvement of the patient's quality of life. Notwithstanding all merits, the clinical application of palifermin is limited owing to its instability and production challenges. Hence, a growing number of ongoing researches are designed to deal with these problems and enhance the physicochemical and pharmaceutical properties of palifermin. In the current review, we discuss KGF structure and function, potential therapeutic applications of palifermin, as well as the latest progress in the production of recombinant human KGF and its challenges ahead.
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Affiliation(s)
- Solmaz Sadeghi
- Molecular Medicine Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Hourieh Kalhor
- Molecular Medicine Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran; Cellular and Molecular Research Center, Qom University of Medical Sciences, Qom, Iran
| | - Mohammad Panahi
- Department of Medical Biotechnology, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hoda Abolhasani
- Cellular and Molecular Research Center, Qom University of Medical Sciences, Qom, Iran; Department of Pharmacology, School of Medicine, Qom University of Medical Sciences, Qom, Iran
| | - Bahareh Rahimi
- Department of Medical Biotechnology, Faculty of Applied Medical Sciences, Iran University of Medical Sciences, Tehran, Iran
| | - Reyhaneh Kalhor
- Cellular and Molecular Research Center, Qom University of Medical Sciences, Qom, Iran; Department of Genetics, Colleague of Sciences, Kazerun Branch, Islamic Azad University, Kazerun, Iran
| | - Amirmehdi Mehrabi
- Department of Pharmacoeconomy & Administrative Pharmacy, School Of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Mahsa Vahdatinia
- Molecular Medicine Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Hamzeh Rahimi
- Molecular Medicine Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran.
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Lappin M, Brown V, Zaric S, Lundy F, Coulter W, Irwin C. Interferon-γ stimulates CD14, TLR2 and TLR4 mRNA expression in gingival fibroblasts increasing responsiveness to bacterial challenge. Arch Oral Biol 2016; 61:36-43. [DOI: 10.1016/j.archoralbio.2015.10.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 07/22/2015] [Accepted: 10/05/2015] [Indexed: 12/18/2022]
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Kutikhin AG, Yuzhalin AE, Brusina EB. Organ Microbiota in Cancer Development: The Holy Grail of Biological Carcinogenesis. Infect Agent Cancer 2013. [DOI: 10.1007/978-94-007-5955-8_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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The Role of Bacteria in Cancer Development. Infect Agent Cancer 2013. [DOI: 10.1007/978-94-007-5955-8_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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6
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Firth JD, Ekuni D, Irie K, Tomofuji T, Morita M, Putnins EE. Lipopolysaccharide induces a stromal-epithelial signalling axis in a rat model of chronic periodontitis. J Clin Periodontol 2012; 40:8-17. [PMID: 23167849 DOI: 10.1111/jcpe.12023] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Revised: 09/10/2012] [Accepted: 09/16/2012] [Indexed: 11/29/2022]
Abstract
AIM Lipopolysaccharide is a bacterial virulence factor implicated in chronic periodontitis, which may penetrate the junctional epithelial barrier and basement membrane to insult underlying stroma. We sought to identify lipopolysaccharide-induced global gene expression changes responsible for signalling between stroma and epithelium during disease onset. MATERIALS AND METHODS Using a rat lipopolysaccharide periodontitis model, junctional epithelium and underlying stromal tissue were separately collected from healthy and diseased animals by laser-capture microdissection and subject to gene expression microarray analysis. Key gene products identified were validated in gingival epithelial and fibroblast cell cultures. RESULTS Global gene expression patterns distinguishing health versus disease were found in and between both tissue types. In stroma, the most significantly altered gene ontology function group (Z ≥ 4.00) was cytokines, containing most significantly (±2-fold; p < 0.05) upregulated genes amphiregulin, IL1-β and Fas ligand, all positive, diffusible modulators of the epithelial growth factor receptor pathway. In epithelium, the most significant changes were in downregulated FOS-related antigen-1 gene, somatostatin receptor-2 gene and mucin-4 gene, all negative modulators of the epithelial growth factor receptor pathway. CONCLUSION These results establish a periodontitis model for studying gene product interactions and suggests that the onset of junctional epithelial disease hyperproliferation involves a concerted stromal-epithelial signalling axis.
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Affiliation(s)
- James D Firth
- Department of Oral Biological & Medical Sciences, University of British Columbia, Vancouver, BC, Canada
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Gong Y, Bi W, Cao L, Yang Y, Chen J, Yu Y. Association of CD14-260 polymorphisms, red-complex periodontopathogens and gingival crevicular fluid cytokine levels with cyclosporine A-induced gingival overgrowth in renal transplant patients. J Periodontal Res 2012; 48:203-12. [PMID: 22934794 DOI: 10.1111/j.1600-0765.2012.01521.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/18/2012] [Indexed: 12/13/2022]
Abstract
UNLABELLED BACKGROUD AND OBJECTIVE: Genetic factors may influence the colonization of pathogenic bacteria, therefore increasing the risk for the initiation and development of periodontal disease. The present study was carried out to investigate the association of CD14-260 polymorphisms, subgingival microbiota, and gingival crevicular fluid (GCF) cytokine levels with cyclosporine A (CsA)-induced gingival overgrowth (GO) in renal transplant patients. MATERIAL AND METHODS A total of 204 patients were dichotomized into two groups: 124 with GO and 80 without GO. The CD14-260 polymorphisms were measured using an allele-specific PCR method. The levels of periodontal pathogens were determined by real-time PCR of subgingival samples. GCF levels of IL-1β and sCD14 were detected by ELISA. RESULTS The frequency of CD14-260 genotype CT + TT was found to be similar in both groups. Patients with GO presented increased prevalence of Pg, Td, and Tf (red complex) and significantly higher levels of interleukin -1β than those without GO. Patients with GO carrying CT + TT genotypes were found to have higher frequencies of Pg, Td, and Tf than those carrying the CC genotype. Furthermore, in the presence of red complex, CT + TT genotypes were associated with higher interleukin -1β levels and severe GO. Multiple logistic regression analysis demonstrated that the severity of GO is not dependent on age, gender and pharmacological variables, being only associated with CD14-260 genotype and red complex periodontopathogens. CONCLUSION No association between CD14-260 polymorphisms and the prevalence of GO was revealed in renal transplant patients administered CsA. However, CD14-260 CT + TT genotypes are associated with the prevalence of red complex periodontopathogens in patients with GO, and may thus play some role in the development of severe CsA-induced GO.
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Affiliation(s)
- Y Gong
- Department of Stomatology, Zhongshan Hospital, Fudan University, Shanghai, China
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Pinelis YI, Tsybikov NN, Malezhik MS, Malezhik LP. Heat shock protein concentrations in chronic generalized periodontitis of elderly patients. ADVANCES IN GERONTOLOGY 2012. [DOI: 10.1134/s2079057012030125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Candia E, Díaz-Jiménez D, Langjahr P, Núñez LE, de la Fuente M, Farfán N, López-Kostner F, Abedrapo M, Alvarez-Lobos M, Pinedo G, Beltrán CJ, González C, González MJ, Quera R, Hermoso MA. Increased production of soluble TLR2 by lamina propria mononuclear cells from ulcerative colitis patients. Immunobiology 2011; 217:634-42. [PMID: 22101184 DOI: 10.1016/j.imbio.2011.10.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2011] [Revised: 09/13/2011] [Accepted: 10/28/2011] [Indexed: 12/12/2022]
Abstract
Toll-like receptor 2 (TLR2) is a type I pattern recognition receptor that has been shown to participate in intestinal homeostasis. Its increased expression in the lamina propria has been associated with the pathogenesis in inflammatory bowel disease (IBD), such as ulcerative colitis (UC) and Crohn's disease (CD). Recently, soluble TLR2 (sTLR2) variants have been shown to counteract inflammatory responses driven by the cognate receptor. Despite the evident roles of TLR2 in intestinal immunity, no study has elucidated the production and cellular source of sTLR2 in IBD. Furthermore, an increase in the population of activated macrophages expressing TLR2 that infiltrates the intestine in IBD has been reported. We aimed first to assess the production of the sTLR2 by UC and CD organ culture biopsies and lamina propria mononuclear cells (LPMCs) as well as the levels of sTLR2 in serum, and then characterize the cell population from lamina propria producing the soluble protein. Mucosa explants, LPMCs and serum were obtained from UC, CD patients and control subjects. The level of sTLR2 was higher in conditioned media from organ culture biopsies and LPMCs from UC patients in comparison to CD and controls. Moreover, an inverse correlation between the content of intestinal and serum sTLR2 levels was observed in UC patients. Additionally, when characterizing the cellular source of the increased sTLR2 by LPMCs from UC patients, an increase in TLR2(+)/CD33(+) cell population was found. Also, these cells expressed CX3CR1, which was related to the increased levels of intestinal FKN in UC patients, suggesting that a higher proportion of TLR2(+) mononuclear cells infiltrate the lamina propria. The increased production of sTLR2 suggests that a differential regulating factor of the innate immune system is present in the intestinal mucosa of UC patients.
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Affiliation(s)
- Enzo Candia
- Disciplinary Program of Immunology, Institute of Biomedical Sciences, Faculty of Medicine, Universidad de Chile, Santiago, CL 8380453, Chile
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Hooper SJ, Wilson MJ, Crean SJ. Exploring the link between microorganisms and oral cancer: a systematic review of the literature. Head Neck 2009; 31:1228-39. [PMID: 19475550 DOI: 10.1002/hed.21140] [Citation(s) in RCA: 129] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The majority of cases of oral cancer have been related to tobacco use and heavy alcohol consumption. However, the incidence of oral cavity carcinoma appears to be increasing in many parts of the world in a manner that it is difficult to explain with traditional risk factors alone. Meanwhile, interest in the possible relationships between microorganisms and the different stages of cancer development has been rising and numerous mechanisms by which bacteria and yeast may initiate or promote carcinogenesis are currently under investigation. In particular, a persuasive body of evidence suggests a possible etiological role involving the metabolism and production of carcinogenic products, such as acetaldehyde. Other suggested mechanisms include the induction of chronic inflammation and direct interference with eukaryotic cell cycle and signaling pathways. This review aims to summarize the known associations between microbial infection and cancer and draw attention to how they may relate to oral carcinoma.
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Affiliation(s)
- Samuel J Hooper
- Tissue Engineering and Reparative Dentistry, School of Dentistry, Cardiff University, Heath Park, Cardiff, CF14 4XY, United Kingdom.
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The toll-like receptor signaling molecule Myd88 contributes to pancreatic beta-cell homeostasis in response to injury. PLoS One 2009; 4:e5063. [PMID: 19357791 PMCID: PMC2666970 DOI: 10.1371/journal.pone.0005063] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2008] [Accepted: 02/19/2009] [Indexed: 11/19/2022] Open
Abstract
Commensal flora and pathogenic microbes influence the incidence of diabetes in animal models yet little is known about the mechanistic basis of these interactions. We hypothesized that Myd88, an adaptor molecule in the Toll-like-receptor (TLR) pathway, regulates pancreatic beta-cell function and homeostasis. We first examined beta-cells histologically and found that Myd88-/- mice have smaller islets in comparison to C57Bl/6 controls. Myd88-/- mice were nonetheless normoglycemic both at rest and after an intra-peritoneal glucose tolerance test (IPGTT). In contrast, after low-dose streptozotocin (STZ) challenge, Myd88-/-mice had an abnormal IPGTT relative to WT controls. Furthermore, Myd88-/- mice suffer enhanced beta-cell apoptosis and have enhanced hepatic damage with delayed recovery upon low-dose STZ treatment. Finally, we treated WT mice with broad-spectrum oral antibiotics to deplete their commensal flora. In WT mice, low dose oral lipopolysaccharide, but not lipotichoic acid or antibiotics alone, strongly promoted enhanced glycemic control. These data suggest that Myd88 signaling and certain TLR ligands mediate a homeostatic effect on beta-cells primarily in the setting of injury.
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Panaro MA, Cianciulli A, Gagliardi N, Mitolo CI, Acquafredda A, Cavallo P, Mitolo V. CD14 major role during lipopolysaccharide-induced inflammation in chick embryo cardiomyocytes. ACTA ACUST UNITED AC 2008; 53:35-45. [DOI: 10.1111/j.1574-695x.2008.00397.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Quinchia-Rios BH, Guerrero M, Abozeid S, Bainbridge B, Darveau R, Compton T, Bertics PJ. Down-regulation of epidermal growth factor receptor-dependent signaling by Porphyromonas gingivalis lipopolysaccharide in life-expanded human gingival fibroblasts. J Periodontal Res 2008; 43:290-304. [PMID: 18221293 DOI: 10.1111/j.1600-0765.2007.01029.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
BACKGROUND AND OBJECTIVE Human gingival fibroblasts exhibit proliferative responses following epidermal growth factor exposure, which are thought to enhance periodontal regeneration in the absence of bacterial products such as lipopolysacharide. However, lipopolysaccharide challenge activates human gingival fibroblasts to release several inflammatory mediators that contribute to the immune response associated with periodontitis and attenuate wound repair. We tested the hypothesis that Porphyromonas gingivalis lipopolysaccharide-activated signaling pathways down-regulate epidermal growth factor receptor-dependent events. MATERIAL AND METHODS To study lipopolysaccharide/epidermal growth factor interactions in human gingival fibroblasts, we introduced the catalytic subunit of human telomerase into human gingival fibroblasts, thereby generating a more long-lived cellular model. These cells were characterized and evaluated for lipopolysaccharide/epidermal growth factor responsiveness and regulation of epidermal growth factor-dependent pathways. RESULTS Comparison of human telomerase-transduced gingival fibroblasts with human gingival fibroblasts revealed that both cell lines exhibit a spindle-like morphology and express similar levels of epidermal growth factor receptor, CD14 and Toll-like receptors 2 and 4. Importantly, human telomerase-transduced gingival fibroblasts proliferation rates are increased 5-9 fold over human gingival fibroblasts and exhibit a longer life span in culture. In addition, human telomerase-transduced gingival fibroblasts and human gingival fibroblasts exhibit comparable profiles of mitogen-activated protein kinase kinase (extracellular signal-regulated kinase 1/2) activation upon epidermal growth factor or P. gingivalis lipopolysaccharide administration. Interestingly, treatment with P. gingivalis lipopolysaccharide leads to a down-regulation of epidermal growth factor-dependent extracellular signal-regulated kinase 1/2, p38 and cyclic-AMP response element binding protein phosphorylation in both cell types. CONCLUSION These studies demonstrate that human telomerase-transduced gingival fibroblasts exhibit an extended life span and recapitulate human gingival fibroblasts biology. Moreover, this system has allowed for the first demonstration of lipopolysaccharide down-regulation of epidermal growth factor activated pathways in human gingival fibroblasts and should facilitate the analysis of signaling events relevant to the pathogenesis and treatment of periodontitis.
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Affiliation(s)
- B H Quinchia-Rios
- University of Wisconsin-Madison, Department of Biomolecular Chemistry, Madison, WI 53706, USA
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Ekuni D, Firth JD, Putnins EE. Regulation of epithelial cell growth factor receptor protein and gene expression using a rat periodontitis model. J Periodontal Res 2006; 41:340-9. [PMID: 16827730 DOI: 10.1111/j.1600-0765.2006.00881.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND AND OBJECTIVE Regulation of epithelial cell behavior associated with periodontitis is not well elucidated but many responses will ultimately be regulated by growth factor receptors. Using a rat experimental periodontitis model, protein and gene expression of select growth factor receptors in junctional and pocket epithelium were examined. MATERIAL AND METHODS Periodontal disease was induced by daily topical application of lipopolysaccharide using an established protocol. Animals were killed at time 0 (control), and at 2 and 8 wk. Frozen tissue samples were collected from the right palatal gingival soft tissue, and the left periodontal tissues were decalcified and embedded in paraffin. Laser microdissection and quantitative reverse transcription-polymerase chain reaction (qRT-PCR) was used to quantify keratinocyte growth factor receptor (KGFR), hepatocyte growth factor receptor (HGFR), epidermal growth factor receptor (EGFR) and fibroblast growth factor receptor 1 (FGFR1) gene expression, and in situ RT-PCR localized these increases to specific epithelial cells. Receptor protein expression was examined immunohistochemically. In cell culture, induction of HGFR and KGFR protein expression by serum, lipopolysaccharide and pro-inflammatory cytokines were examined using flow cytometry. RESULTS Eight-week tissue samples exhibited histological changes consistent with periodontitis. KGFR and HGFR gene and protein expression were significantly induced at the 8 wk time point. KGFR expression was significantly up-regulated in basal and parabasal pocket epithelial cells, but HGFR was up-regulated throughout the pocket epithelium. In cell culture serum, lipopolysaccharide and pro-inflammatory cytokines, interleukin-1beta and tumour necrosis factor-alpha significantly induced KGFR protein receptor expression, but HGFR expression was only induced by serum. CONCLUSION KGFR and HGFR are highly up-regulated in this model of periodontal disease and may play a significant role in regulating the proliferation and migration of pocket epithelium.
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Affiliation(s)
- D Ekuni
- Department of Oral Health, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
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Eick S, Reissmann A, Rödel J, Schmidt KH, Pfister W. Porphyromonas gingivalis survives within KB cells and modulates inflammatory response. ACTA ACUST UNITED AC 2006; 21:231-7. [PMID: 16842507 DOI: 10.1111/j.1399-302x.2006.00282.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
BACKGROUND/AIMS The purpose of the study was to investigate the intracellular survival of Porphyromonas gingivalis as a possible mechanism for maintaining periodontitis. METHODS P. gingivalis strains, the strain ATCC 33277 and seven clinical isolates, were co-cultured with KB cells. The number of intracellular bacteria was determined up to 3 days after infection. In addition, the numbers of KB cells per well, the concentrations of the cytokines interleukin-1beta (IL-1beta), IL-6, IL-8 and tumour necrosis factor-alpha (TNF-alpha) and the arginine-specific amidolytic activity were measured. The 16S rRNA of P. gingivalis and the mRNA expression of IL-1beta, IL-6, IL-8, TNF-alpha and rgpA were also determined. RESULTS All the P. gingivalis strains studied were able to survive within KB cells. In contrast to the reduced values of colony-forming units at day 3, equal and higher levels of 16S rRNA were seen in comparison to day 0. Arginine-specific amidolytic activity declined in all samples during infection. Expression of mRNA for rgpA was not found after infection of KB cells by P. gingivalis strains. IL-8 was detectable in all samples 2 days after infection with P. gingivalis strains. Principal components analysis underlined a correlation between the arginine-specific amidolytic activity 1 h after infection and both the released IL-8 and the mRNA expression of IL-8. Associations were found between the cultivable numbers of intracellular P. gingivalis and the mRNAs of IL-1, IL-6 and TNF-alpha at the day of infection. CONCLUSION The results indicate survival of P. gingivalis within epithelial cells, possibly in a non-cultivable stage. Invasion into cells modulates the virulence properties of P. gingivalis as well as the inflammatory response of the cells.
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Affiliation(s)
- S Eick
- Department of Medical Microbiology, University Hospital of Jena, Jena, Germany.
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Reife RA, Coats SR, Al-Qutub M, Dixon DM, Braham PA, Billharz RJ, Howald WN, Darveau RP. Porphyromonas gingivalis lipopolysaccharide lipid A heterogeneity: differential activities of tetra- and penta-acylated lipid A structures on E-selectin expression and TLR4 recognition. Cell Microbiol 2006; 8:857-68. [PMID: 16611234 DOI: 10.1111/j.1462-5822.2005.00672.x] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Porphyromonas gingivalis is a gram-negative bacterium strongly associated with periodontitis, a chronic inflammatory disease of the tissue surrounding the tooth root surface. Lipopolysaccharide (LPS) obtained from P. gingivalis is unusual in that it has been shown to display an unusual amount of lipid A heterogeneity containing both tetra- and penta-acylated lipid A structures. In this report, it is shown that penta-acylated lipid A structures facilitate E-selectin expression whereas tetra-acylated lipid A structures do not. Furthermore, it is shown that tetra-acylated lipid A structures are potent antagonists for E-selectin expression. Both tetra- and penta-acylated lipid A structures interact with TLR4 although experiments utilizing human, mouse and human/mouse chimeric TLR4 proteins demonstrated that they interact differentially with the TLR4 signalling complexes. The presence of two different structural types of lipid A in P. gingivalis LPS, with opposing effects on the E-selectin response suggests that this organism is able to modulate innate host responses by alterations in the relative amount of these lipid A structures.
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Affiliation(s)
- Robert A Reife
- Department of Periodontics, University of Washington, Seattle, WA 98195, USA
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Affiliation(s)
- P Mark Bartold
- Colgate Australian Clinical Dental Resource Centre, University of Adelaide, South Australia, Australia
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Shimizu T, Yokota SI, Takahashi S, Kunishima Y, Takeyama K, Masumori N, Takahashi A, Matsukawa M, Itoh N, Tsukamoto T, Fujii N. Membrane-anchored CD14 is important for induction of interleukin-8 by lipopolysaccharide and peptidoglycan in uroepithelial cells. CLINICAL AND DIAGNOSTIC LABORATORY IMMUNOLOGY 2005; 11:969-76. [PMID: 15358661 PMCID: PMC515273 DOI: 10.1128/cdli.11.5.969-976.2004] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We investigated the induction of interleukin-8 (IL-8) by bacterial lipopolysaccharide (LPS) and peptidoglycan (PGN) in the bladder cancer cell lines T24, 5637, UM-UC-3, and HT1197. T24 and 5637 cells strongly induced IL-8 after stimulation with LPS or PGN in a dose- and time-dependent manner, whereas UM-UC-3 and HT1197 cells did so very weakly. The expression of CD14 at the mRNA, total cellular protein, and cell surface protein levels differed among these cell lines, but the expression levels of Toll-like receptors 2 and 4 (TLR2 and TLR4) were not significantly different. The CD14 expression levels were found to correlate with the inducibility of IL-8 by LPS or PGN. Treatment of T24 and 5637 cells with phosphatidylinositol-specific phospholipase C to eliminate CD14 from the cell surface dramatically suppressed the induction of IL-8. On the other hand, UM-UC-3 cells transfected with CD14 cDNA expressed membrane-anchored CD14 and showed more efficient induction of IL-8 by LPS stimulation than untransfected controls. These results suggest that the presence of the membrane-anchored, but not the soluble, form of CD14 is a strong factor in IL-8 induction in bladder epithelial cells in response to bacterial components. The presence of the membrane-anchored form of CD14 may thus be a determinant for the inflammatory response of uroepithelial cells.
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Affiliation(s)
- Toshiaki Shimizu
- Department of Urology, Sapporo Medical University School of Medicine, Chuo-ku, Sapporo, Japan
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Li M, Firth JD, Putnins EE. Keratinocyte growth factor-1 expression in healthy and diseased human periodontal tissues. J Periodontal Res 2005; 40:118-28. [PMID: 15733146 DOI: 10.1111/j.1600-0765.2004.00780.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
OBJECTIVES Keratinocyte growth factor-1 (KGF-1) is up-regulated in chronic inflammation and specifically stimulates epithelial cell proliferation by signaling through the epithelial-specific keratinocyte growth factor receptor (KGFR). We examined KGF-1 and KGFR protein and gene expression in healthy and diseased periodontal tissues. METHODS Tissues were collected from patients with periodontal health or disease, immediately frozen and stained for KGF-1 and KGFR protein expression. Laser capture microdissection of epithelial and connective tissue cells with reverse transcription-polymerase chain reaction (RT-PCR) examined KGF-1 and KGFR gene expression profiles and enzymatic digestion with heparitinase, chondroitinase ABC or pre-treatment with suramin examined epithelial surface molecule interactions with KGF-1. RESULTS In tissues collected from healthy patients, KGF-1 protein localized to areas of junctional and basal oral epithelial cells and was significantly increased in periodontal pocket epithelium (p<0.01) and in the oral epithelium (p<0.05) of disease-associated tissues. KGFR localized to the junctional and the parabasal cells of oral epithelium, with the relative staining intensity being increased in disease-associated pocket epithelium (p<0.05). Laser capture microdissection with RT-PCR confirmed KGF-1 and KGFR were specifically expressed by connective tissue and epithelium, respectively. KGF-1 localization to epithelial cells was largely eliminated by suramin pre-treatment, indicating interaction with the KGFR. CONCLUSIONS KGF-1 and KGFR proteins are expressed in healthy periodontal tissues but significantly increased in diseased periodontal tissues. We hypothesize up-regulation of KGF-1 and KGFR protein associated with disease regulates epithelial cell behavior associated with onset and progression of periodontal pocket formation.
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Affiliation(s)
- Min Li
- Laboratory of Periodontal Biology, Department of Oral Biological and Medical Sciences, The University of British Columbia, Vancouver, British Columbia, Canada
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20
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Tichomirowa M, Theodoropoulou M, Lohrer P, Schaaf L, Losa M, Uhl E, Lange M, Arzt E, Stalla GK, Renner U. Bacterial endotoxin (lipopolysaccharide) stimulates interleukin-6 production and inhibits growth of pituitary tumour cells expressing the toll-like receptor 4. J Neuroendocrinol 2005; 17:152-60. [PMID: 15796767 DOI: 10.1111/j.1365-2826.2005.01286.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Members of the Toll receptor (Tlr) family have a crucial role in the innate immune response following bacterial infection. The effects of Gram-negative bacteria-derived endotoxins (lipopolysaccharide, LPS) are predominantly mediated by Tlr4, and we have recently shown that pituitary folliculostellate cells express functional Tlr4. In the present study, we investigated whether Tlr4 is also present in normal and transformed endocrine epithelial pituitary cell types. By reverse transcriptase-polymerase chain reaction, Tlr4 mRNA expression was found in some pituitary epithelial tumour cell lines (AtT20, HP75), whereas others were negative (GH3, alphaT3-1). Tlr4 protein was detected by immunohistochemistry in a few epithelial cells in normal human anterior pituitaries and in 26 out of 67 human pituitary tumours analysed. LPS had no effect on adrenocorticotropic hormone secretion in Tlr4-positive AtT20 cells, but it suppressed the growth of these cells in a dose-dependent manner. As expected, neither hormone secretion, nor growth of Tlr4-negative GH3 cells was affected by LPS. In cell cultures of Tlr4-positive pituitary adenomas, LPS dose-dependently stimulated the production of interleukin (IL)-6, which is known to induce growth and hormone production in pituitary tumours. The LPS-induced IL-6 production was blocked by the specific p38alphaMAP kinase inhibitor, SB203580, and by the synthetic glucocorticoid, dexamethasone. The data suggest that, during Gram-negative bacteria-induced infections or inflammatory processes, LPS could affect pituitary tumour pathophysiology and progression in the subset of Tlr4-expressing pituitary adenomas.
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Affiliation(s)
- M Tichomirowa
- Max-Planck-Institute of Psychiatry, Department of Endocrinology, Munich, Germany
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21
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Rakoff-Nahoum S, Paglino J, Eslami-Varzaneh F, Edberg S, Medzhitov R. Recognition of commensal microflora by toll-like receptors is required for intestinal homeostasis. Cell 2004; 118:229-41. [PMID: 15260992 DOI: 10.1016/j.cell.2004.07.002] [Citation(s) in RCA: 3069] [Impact Index Per Article: 153.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2004] [Revised: 05/21/2004] [Accepted: 05/26/2004] [Indexed: 12/11/2022]
Abstract
Toll-like receptors (TLRs) play a crucial role in host defense against microbial infection. The microbial ligands recognized by TLRs are not unique to pathogens, however, and are produced by both pathogenic and commensal microorganisms. It is thought that an inflammatory response to commensal bacteria is avoided due to sequestration of microflora by surface epithelia. Here, we show that commensal bacteria are recognized by TLRs under normal steady-state conditions, and this interaction plays a crucial role in the maintenance of intestinal epithelial homeostasis. Furthermore, we find that activation of TLRs by commensal microflora is critical for the protection against gut injury and associated mortality. These findings reveal a novel function of TLRs-control of intestinal epithelial homeostasis and protection from injury-and provide a new perspective on the evolution of host-microbial interactions.
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Affiliation(s)
- Seth Rakoff-Nahoum
- Howard Hughes Medical Institute and Section of Immunobiology, Yale University School of Medicine, New Haven, CT 06510, USA
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Darveau RP, Pham TTT, Lemley K, Reife RA, Bainbridge BW, Coats SR, Howald WN, Way SS, Hajjar AM. Porphyromonas gingivalis lipopolysaccharide contains multiple lipid A species that functionally interact with both toll-like receptors 2 and 4. Infect Immun 2004; 72:5041-51. [PMID: 15321997 PMCID: PMC517442 DOI: 10.1128/iai.72.9.5041-5051.2004] [Citation(s) in RCA: 394] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2004] [Revised: 04/19/2004] [Accepted: 05/26/2004] [Indexed: 12/16/2022] Open
Abstract
The innate host response to lipopolysaccharide (LPS) obtained from Porphyromonas gingivalis is unusual in that different studies have reported that it can be an agonist for Toll-like receptor 2 (TLR2) as well as an antagonist or agonist for TLR4. In this report it is shown that P. gingivalis LPS is highly heterogeneous, containing more lipid A species than previously described. In addition, purification of LPS can preferentially fractionate these lipid A species. It is shown that an LPS preparation enriched for lipid A species at m/z 1,435 and 1,450 activates human and mouse TLR2, TLR2 plus TLR1, and TLR4 in transiently transfected HEK 293 cells coexpressing membrane-associated CD14. The HEK cell experiments further demonstrated that cofactor MD-2 was required for functional engagement of TLR4 but not of TLR2 nor TLR2 plus TLR1. In addition, serum-soluble CD14 effectively transferred P. gingivalis LPS to TLR2 plus TLR1, but poorly to TLR4. Importantly, bone marrow cells obtained from TLR2(-/-) and TLR4(-/-) mice also responded to P. gingivalis LPS in a manor consistent with the HEK results, demonstrating that P. gingivalis LPS can utilize both TLR2 and TLR4. No response was observed from bone marrow cells obtained from TLR2 and TLR4 double-knockout mice, demonstrating that P. gingivalis LPS activation occurred exclusively through either TLR2 or TLR4. Although the biological significance of the different lipid A species found in P. gingivalis LPS preparations is not currently understood, it is proposed that the presence of multiple lipid A species contributes to cell activation through both TLR2 and TLR4.
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Affiliation(s)
- Richard P Darveau
- Department of Periodontics, University of Washington, Health Sciences Center, Box 357444, Seattle, WA 98195, USA.
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Firth JD, Putnins EE. Keratinocyte growth factor 1 inhibits wound edge epithelial cell apoptosis in vitro. J Invest Dermatol 2004; 122:222-31. [PMID: 14962112 DOI: 10.1046/j.0022-202x.2003.22124.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The ability of keratinocyte growth factor 1 to modulate apoptosis in the absence of proliferation was studied in vitro. A HaCaT scrape wound model was developed in which dense monolayers prior to wounding were cultured to quiescence in defined media with hydroxyurea at concentrations that blocked proliferation without loss of cell viability. Scrape wounding was then found to induce apoptosis, originating at the wound edge, but subsequently radiating away over a 24 h period to encompass areas not originally damaged. Keratinocyte growth factor 1 inhibited this radial progression of apoptosis in a concentration-dependent manner up to 20 ng per mL with induced migration present at the wound edge. The extent of this rescue was modulated by the concentration of Ca2+ prior to wounding. In control wound cultures apoptotic bodies were found in cells adjacent to the wound interface but were greatly reduced in keratinocyte-growth-factor-1-treated groups. Keratinocyte growth factor 1 receptor expression was significantly induced within two to three cell widths of the scraped wound edge, at levels far exceeding those found at the leading edge of a nonwounded epithelial sheet. Tumor necrosis factor alpha (1-5 ng per mL) or Escherichia coli lipopolysaccharide (10-50 ng per mL) exacerbated scrape-induced early apoptosis (1-4 h), but was largely ameliorated by coculture with keratinocyte growth factor 1. Keratinocyte growth factor 1 protection was associated with a reduction in both caspase-3 activation and cytokeratin-19 loss. Protected wound edges were also associated with the maintenance of e-cadherin expression and induction of beta1 integrin and actin stress fiber organization. These results suggest that keratinocyte growth factor 1 may play a role in limiting mechanically induced apoptotic processes at the epithelial wound edge in a manner that is distinct from its proliferative function.
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Affiliation(s)
- James D Firth
- Department of Oral Biological and Medical Sciences, University of British Columbia, Vancouver, British Columbia, Canada
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