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Compromised inflammatory cytokine response to P. gingivalis LPS by fibroblasts from inflamed human gingiva. Clin Oral Investig 2017; 22:919-927. [DOI: 10.1007/s00784-017-2171-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 06/26/2017] [Indexed: 12/11/2022]
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Gutiérrez-Venegas G, Castillo-Alemán R. Characterization of the transduction pathway involved in c-fos and c-jun expression induced by Aggregatibacter actinomycetemcomitans lipopolysaccharides in human gingival fibroblasts. Int Immunopharmacol 2008; 8:1513-23. [DOI: 10.1016/j.intimp.2008.06.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2008] [Revised: 06/12/2008] [Accepted: 06/16/2008] [Indexed: 10/21/2022]
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Belibasakis GN, Johansson A, Wang Y, Chen C, Lagergård T, Kalfas S, Lerner UH. Cytokine responses of human gingival fibroblasts to Actinobacillus actinomycetemcomitans cytolethal distending toxin. Cytokine 2005; 30:56-63. [PMID: 15804596 DOI: 10.1016/j.cyto.2004.11.008] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2004] [Revised: 11/26/2004] [Accepted: 11/29/2004] [Indexed: 11/23/2022]
Abstract
Actinobacillus actinomycetemcomitans is implicated in the pathogenesis of localized aggressive periodontitis, and has the capacity to express a cytolethal distending toxin (Cdt). Gingival fibroblasts (GF) are resident cells of the periodontium, which can express several osteolytic cytokines. The aims of this study were a) to investigate the role of Cdt in A. actinomycetemcomitans-induced expression of osteolytic cytokines and their cognate receptors in GF and b) to determine if the previously demonstrated induction of receptor activator of NFkappaB ligand (RANKL) by A. actinomycetemcomitans is mediated by these pro-inflammatory cytokines or by prostaglandin E(2) (PGE(2)). A. actinomycetemcomitans clearly induced interleukin (IL)-6, IL-1beta, and to a minimal extent, tumor necrosis factor (TNF)-alpha mRNA expression. At the protein level, IL-6 but not IL-1beta or TNF-alpha expression was stimulated. The mRNA expression of the different receptor subtypes recognizing IL-6, IL-1beta and TNF-alpha was not affected. A cdt-knockout strain of A. actinomycetemcomitans had similar effects on cytokine and cytokine receptor mRNA expression, compared to its parental wild-type strain. Purified Cdt stimulated IL-6, but not IL-1beta or TNF-alpha protein biosynthesis. Antibodies neutralizing IL-6, IL-1 or TNF-alpha, and the PGE(2) synthesis inhibitor indomethacin, did not affect A. actinomycetemcomitans-induced RANKL expression. In conclusion, a) A. actinomycetemcomitans induces IL-6 production in GF by a mechanism largely independent of its Cdt and b) A. actinomycetemcomitans-induced RANKL expression in GF occurs independently of IL-1, IL-6, TNF-alpha, or PGE(2).
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MESH Headings
- Aggregatibacter actinomycetemcomitans/genetics
- Aggregatibacter actinomycetemcomitans/pathogenicity
- Bacterial Toxins/toxicity
- Carrier Proteins/drug effects
- Carrier Proteins/genetics
- Carrier Proteins/metabolism
- Cytokines/drug effects
- Cytokines/genetics
- Cytokines/metabolism
- Dinoprostone/metabolism
- Fibroblasts/drug effects
- Fibroblasts/immunology
- Gene Expression Regulation/drug effects
- Gingiva/drug effects
- Gingiva/metabolism
- Gingiva/microbiology
- Humans
- Indomethacin/pharmacology
- Inflammation Mediators/immunology
- Inflammation Mediators/metabolism
- Interleukin 1 Receptor Antagonist Protein
- Membrane Glycoproteins/drug effects
- Membrane Glycoproteins/genetics
- Membrane Glycoproteins/metabolism
- Mutation
- RANK Ligand
- Receptor Activator of Nuclear Factor-kappa B
- Receptors, Interleukin-1/drug effects
- Receptors, Interleukin-1/genetics
- Receptors, Interleukin-1/metabolism
- Receptors, Interleukin-1 Type II
- Receptors, Interleukin-6/drug effects
- Receptors, Interleukin-6/genetics
- Receptors, Interleukin-6/metabolism
- Receptors, Tumor Necrosis Factor, Type I/drug effects
- Receptors, Tumor Necrosis Factor, Type I/genetics
- Receptors, Tumor Necrosis Factor, Type I/metabolism
- Receptors, Tumor Necrosis Factor, Type II/drug effects
- Receptors, Tumor Necrosis Factor, Type II/genetics
- Receptors, Tumor Necrosis Factor, Type II/metabolism
- Sialoglycoproteins/pharmacology
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Affiliation(s)
- G N Belibasakis
- Division of Oral Microbiology, Department of Odontology, S-901 87 Umeå University, Umeå, Sweden.
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Andrian E, Grenier D, Rouabhia M. Porphyromonas gingivalis lipopolysaccharide induces shedding of syndecan-1 expressed by gingival epithelial cells. J Cell Physiol 2005; 204:178-83. [PMID: 15648090 DOI: 10.1002/jcp.20287] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Syndecans are constitutively shed from growing epithelial cells as the part of normal cell surface turnover. However, increased serum levels of the soluble syndecan ectodomain have been reported to occur during bacterial infections. The aim of this study was to evaluate the potential of lipopolysaccharide (LPS) from the periodontopathogen Porphyromonas gingivalis to induce the shedding of syndecan-1 expressed by human gingival epithelial cells. We showed that the syndecan-1 ectodomain is constitutively shed from the cell surface of human gingival epithelial cells. This constitutive shedding corresponding to the basal level of soluble syndecan-1 ectodomain was significantly increased when cells were stimulated with P. gingivalis LPS and reached a level comparable to that caused by phorbol myristic acid (PMA), an activator of protein kinase C (PKC) which is well known as a shedding agonist. The syndecan-1 shedding was paralleled by pro-inflammatory cytokine interleukin-1 beta (IL-1beta), IL-6, IL-8, and tumor necrosis factor alpha (TNF-alpha) release. Indeed, secretion of IL-1beta and TNF-alpha increased following stimulation by P. gingivalis LPS and PMA, respectively. When recombinant forms of these proteins were added to the cell culture, they induced a concentration-dependent increase in syndecan-1 ectodomain shedding. A treatment with IL-1beta converting enzyme (ICE) specific inhibitor prevented IL-1beta secretion by epithelial cells stimulated by P. gingivalis LPS and decreased the levels of shed syndecan-1 ectodomain. We also observed that PMA and TNF-alpha stimulated matrix metalloproteinase-9 secretion, whereas IL-1beta and P. gingivalis LPS did not. Our results demonstrated that P. gingivalis LPS stimulated syndecan-1 shedding, a phenomenon that may be mediated in part by IL-1beta, leading to an activation of intracellular signaling pathways different from those involved in PMA stimulation.
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Affiliation(s)
- Elisoa Andrian
- Groupe de Recherche en Ecologie Buccale, Faculté de Médecine Dentaire, Université Laval, Quebec City, Quebec, Canada
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Bartruff JB, Yukna RA, Layman DL. Outer Membrane Vesicles FromPorphyromonas gingivalisAffect the Growth and Function of Cultured Human Gingival Fibroblasts and Umbilical Vein Endothelial Cells. J Periodontol 2005; 76:972-9. [PMID: 15948693 DOI: 10.1902/jop.2005.76.6.972] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND The purpose of this study was to examine the effects of outer membrane vesicles (OMV) obtained from Porphyromonas gingivalis (Pg) on the growth and function of human gingival fibroblasts (HGF) and human umbilical vein endothelial cells (HUVEC). METHODS OMV were obtained from a cell-free growth medium of Pg ATCC 33277 by 40% NH2SO4 precipitation and ultracentrifugation. Cell proliferation was measured by 3H-thymidine incorporation into growing HGF and HUVEC. Endothelial cell function was determined by their capacity to form a network of capillary tubes on an extracellular matrix (ECM). RESULTS Proliferating HGF and HUVEC demonstrated a significant dose-dependent inhibition of 3H-thymidine uptake when cultured with 0 to 40 microg/ml of OMV protein. HGF and HUVEC showed an IC50 of growth of about 9.0 microg/ml and 4.5 microg/ml of OMV protein, respectively. Capillary tube formation by HUVEC cultured on an ECM was suppressed by 70% to 80% with 5 microg/ml OMV protein after 18 hours of incubation. The presence of proteolytic enzymes in the OMV did not contribute to capillary tube disruption, since blocking enzyme activity with specific inhibitors did not reduce the suppression of capillary tube formation. After heating at 90 degrees C for 5 minutes, OMV significantly lost their capacity to suppress capillary tube formation. CONCLUSIONS OMV significantly inhibit the proliferation of cultured HGF and HUVEC in a dose-dependent manner. OMV suppressed the capillary tube formation by cultured HUVEC. The factor(s) appeared to be a protein and not endotoxin because its inhibitory activity was markedly reduced by heat inactivation. These studies suggest that OMV contribute to chronic periodontitis by suppressing cell proliferation and revascularization in periodontal tissues.
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Affiliation(s)
- Jeffrey B Bartruff
- Department of Periodontics, Louisiana State University School of Dentistry, New Orleans, LA 70119, USA
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Vardar S, Baylas H, Zihnioğlu F, Emingil G, Buduneli N, Atilla G. Total Proteoglycan and Chondroitin-4- Sulfate Levels in Gingiva of Patients With Various Types of Periodontitis. J Periodontol 2004; 75:393-8. [PMID: 15088877 DOI: 10.1902/jop.2004.75.3.393] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND The aim of the present study was to investigate the total proteoglycan (PG) and chondroitin-4-sulfate (C4S) levels in gingival tissue samples obtained from patients with aggressive periodontitis (AgP) and chronic periodontitis (CP) before therapy (baseline) and 1 month after completion of non-surgical periodontal therapy. METHODS Gingival tissue samples were obtained from 10 AgP and 10 CP patients before initiation of treatment (baseline) and 1 month after non-surgical periodontal treatment. The control group comprised 10 systemically and periodontally healthy subjects. Total PG and C4S levels were determined by biochemical techniques. PG levels were analyzed using a modified Bitter and Muir method. C4S assay was carried out using chondroitin sulphate lyase AC and chondroitin-6 sulphate sulphohydrolase enzymes. The results were tested statistically using parametric tests. RESULTS The clinical periodontal parameters demonstrated significant decreases in the periodontitis groups (P<0.05) after treatment, and there was no significant difference between AgP and CP groups at baseline and after treatment (P>0.05). At baseline, total PG and C4S levels in both of the periodontitis groups were significantly lower than that of the control group (P<0.05). One month after the non-surgical periodontal treatment, total PG levels in the periodontitis groups were comparable to the control group (P>0.05), whereas C4S levels in the AgP group were significantly lower than the other study groups (P<0.05). In the CP group, total PG and C4S levels increased significantly (P = 0.001 and P = 0.006, respectively) after non-surgical periodontal treatment, but they did not increase in the AgP group (P>0.05). CONCLUSION The significant increases observed in total proteoglycan and chondroitin-4-sulfate levels after non-surgical periodontal treatment in the CP group but not in the AgP group may suggest that healing patterns differ between the two periodontitis types in terms of PG and C4S composition of extracellular matrix.
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Affiliation(s)
- Saynur Vardar
- Department of Periodontology, School of Dentistry, Ege University, Izmir, Turkey.
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7
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Hara H, Ohta H, Inoue T, Ohashi T, Takashiba S, Murayama Y, Fukui K. Cell surface-associated enolase in Actinobacillus actinomycetemcomitans. Microbiol Immunol 2001; 44:349-56. [PMID: 10888352 DOI: 10.1111/j.1348-0421.2000.tb02505.x] [Citation(s) in RCA: 13] [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
Cell surface-associated materials of Actinobacillus actinomycetemcomitans were extracted by a short incubation of the cell suspension in a Tris-buffered saline in the presence and absence of a restriction enzyme, EcoRI. The supernatants (which we termed EcoRI extract and surface extract, respectively) contained a number of extracellularly released proteins. Of these proteins, four major proteins were identified by N-terminal sequencing to be the 34 and 39 kDa outer membrane proteins, the GroEL-like protein, and a 47 kDa protein homologous to Haemophilus influenzae enolase. Enolase activity was found in the extracts and its relative amount of activity in the EcoRI extract from a culture of the mid-exponential growth phase was estimated as 5.7% of total enzyme activity. In contrast, the relative amount of activity of another cytosolic enzyme, lactate dehydrogenase, was extremely low in the extracts and also in the culture supernatant. These results suggest the external localization of enolase in this bacterium.
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Affiliation(s)
- H Hara
- Department of Periodontology and Endontology, Okayama University Dental School, Japan
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Kadono H, Kido J, Kataoka M, Yamauchi N, Nagata T. Inhibition of osteoblastic cell differentiation by lipopolysaccharide extract from Porphyromonas gingivalis. Infect Immun 1999; 67:2841-6. [PMID: 10338489 PMCID: PMC96590 DOI: 10.1128/iai.67.6.2841-2846.1999] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Lipopolysaccharide from Porphyromonas gingivalis (P-LPS), an important pathogenic bacterium, is closely associated with inflammatory destruction of periodontal tissues. P-LPS induces the release of cytokines and local factors from inflammatory cells, stimulates osteoclastic-cell differentiation, and causes alveolar bone resorption. However, the effect of P-LPS on osteoblastic-cell differentiation remains unclear. In this study, we investigated the effect of P-LPS extract prepared by the hot-phenol-water method, on the differentiation of primary fetal rat calvaria (RC) cells, which contain a subpopulation of osteoprogenitor cells, into osteoblastic cells. P-LPS extract significantly inhibited bone nodule (BN) formation and the activity of alkaline phosphatase (ALPase), an osteoblastic marker, in a dose-dependent manner (0 to 100 ng of P-LPS extract per ml). P-LPS extract (100 ng/ml) significantly decreased BN formation to 27% of the control value and inhibited ALPase activity to approximately 60% of the control level on days 10 to 21 but did not affect RC cell proliferation and viability. P-LPS extract time-dependently suppressed the expression of ALPase mRNA, with an inhibitory pattern similar to that of enzyme activity. The expression of mRNAs for osteocalcin and osteopontin, matrix proteins related to bone metabolism, was markedly suppressed by P-LPS extract. Furthermore, P-LPS extract increased the expression of mRNAs for CD14, LPS receptor, and interleukin-1beta in RC cells. These results indicate that P-LPS inhibits osteoblastic-cell differentiation and suggest that LPS-induced bone resorption in periodontal disease may be mediated by effects on osteoblastic as well as osteoclastic cells.
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Affiliation(s)
- H Kadono
- Department of Periodontology and Endodontology, Tokushima University School of Dentistry, 3-18-15 Kuramoto, Tokushima 770-8504, Japan
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Olsen I, Shah HN, Gharbia SE. Taxonomy and biochemical characteristics of Actinobacillus actinomycetemcomitans and Porphyromonas gingivalis. Periodontol 2000 1999; 20:14-52. [PMID: 10522221 DOI: 10.1111/j.1600-0757.1999.tb00156.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- I Olsen
- Department of Oral Biology, Dental Faculty, University of Oslo, Norway
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10
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Yamalik N, Kilinç K, Caglayan F, Eratalay K, Caglayan G. Molecular size distribution analysis of human gingival proteoglycans and glycosaminoglycans in specific periodontal diseases. J Clin Periodontol 1998; 25:145-52. [PMID: 9495613 DOI: 10.1111/j.1600-051x.1998.tb02420.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In order to determine the molecular-size distribution of gingival proteoglycans (PGs) and glycosaminoglycans (GAGs) both in periodontal health and disease states, gingival tissues were obtained from patients with early onset periodontitis (EOP) and adult periodontitis (AP) and also from periodontally healthy subjects. Gel filtration chromatography of gingival PGs revealed different profiles for periodontally diseased and healthy gingiva. Healthy gingiva was mainly composed of high-molecular size proteins and PGs, while diseased gingival tissue presented a decrease in high-molecular size PG forms and a shift towards low-molecular size proteins and PGs. This indicates the degradation of PG macromolecules during periodontal disease activity. Furthermore, this shift towards low-molecular size forms was more intense in EOP patients when compared to AP patients. Gel filtration of gingival GAGs also demonstrated depolymerization of GAGs, with low-molecular size GAGs being more intense in periodontally diseased gingiva, while healthy gingival GAGs profile was mainly composed of high-molecular size GAGs. Similar to the profile of gingival PGs, low-molecular size gingival GAGs were more prominent in gingival tissue from patients with EOP. These findings suggest that both PGs and GAGs, essential components of the extracellular matrix (ECM), are depolymerized during periodontal disease activity, which is more prominent in EOP. Since the basic feature of periodontal disease is matrix degradation, ECM components, more specifically PGs and GAGs, are likely to provide valuable information for a better understanding of periodontal disease activity.
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Affiliation(s)
- N Yamalik
- Department of Periodontology, Faculty of Dentistry, University of Hacettepe, Ankara-Turkey
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11
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Hill SJ, Ebersole JL. The effect of lipopolysaccharide on growth factor-induced mitogenesis in human gingival fibroblasts. J Periodontol 1996; 67:1274-80. [PMID: 8997673 DOI: 10.1902/jop.1996.67.12.1274] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Quiescent and non-quiescent human gingival fibroblasts (HGF) were incubated for 24 hours with Actinobacillus actinomycetemcomitans lipopolysaccharide (LPS) and/or growth factors (interleukin-1 beta [IL-1 beta], insulin, epidermal growth factor [EGF], platelet-derived growth factor [PDGF], fibroblast growth factor [FGF], and transforming growth factor-beta [TGF-beta]) to examine the ability of LPS to modify HGF proliferation in response to these autocrine and paracrine growth factors. A. actinomycetemcomitans LPS at high concentrations (> or = 9 micrograms/well) generally resulted in a reduction in DNA synthesis in quiescent and non-quiescent fibroblasts; however, LPS at low concentrations (< 9 micrograms/well) showed a minimal enhancement of DNA synthesis (40 to 60%) in quiescent and non-quiescent cells. HGF co-incubated with mitogenic agents and LPS (9 micrograms/well) exhibited suppression of growth factor-induced 3H-Tdr uptake compared to growth factor-stimulated controls. In contrast, 3H-Tdr uptake was slightly elevated with addition of LPS at low concentrations (0.09 microgram/well). These trends were seen with all growth factors tested. Non-quiescent cells, in general, were more responsive to the growth factors and LPS/growth factor combinations when compared to the quiescent HGF. HGF were further tested for the ability of LPS to alter growth factor responsiveness by pretreating the cells with LPS prior to incubation of the growth factor, as well as, subsequent addition of LPS to growth factor-pretreated cells. Similar patterns were observed as above, except IL-1 beta-pretreated quiescent and non-quiescent HGF followed by LPS addition demonstrated a marked elevation in proliferation when compared to IL-1 beta stimulated controls. These findings suggest that LPS may potentially modulate the proliferative rate of connective tissue undergoing inflammatory or growth factor-induced reparative processes in periodontal lesions.
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Affiliation(s)
- S J Hill
- Department of Periodontics and Microbiology, University of Texas Health Science Center at San Antonio, USA
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12
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Wilson M, Henderson B. Virulence factors of Actinobacillus actinomycetemcomitans relevant to the pathogenesis of inflammatory periodontal diseases. FEMS Microbiol Rev 1995; 17:365-79. [PMID: 8845187 DOI: 10.1111/j.1574-6976.1995.tb00220.x] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
There is strong evidence implicating Actinobacillus actinomycetemcomitans as the causative agent of localised juvenile periodontitis (LJP), a disease characterised by rapid destruction of the tooth-supporting tissues. This organism possesses a large number of virulence factors with a wide range of activities which enable it to colonise the oral cavity, invade periodontal tissues, evade host defences, initiate connective tissue destruction and interfere with tissue repair. Adhesion to epithelial and tooth surfaces is dependent on the presence of surface proteins and structures such as microvesicles and fimbriae. Invasion has been demonstrated in vivo and in vitro although the mechanisms involved are poorly understood. The organism has a number of means of evading host defences which include: (i) inhibiting poloymorphonuclear leukocyte (PMN) chemotaxis; (ii) killing PMNs and monocytes; (iii) producing immunosuppressive factors; (iv) secreting proteases capable of cleaving IgG; and (v) producing Fc-binding proteins. Surface components of A. actinomycetemcomitans are potent stimulators of bone resorption and can induce the release of a range of cytokines which can initiate tissue destruction. A number of surface components can also inhibit the proliferation of fibroblasts and their production of components of the extracellular matrix. Little is known, however, regarding the way in which these factors operate in vivo to produce the pathological features of the disease.
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Affiliation(s)
- M Wilson
- Department of Microbiology Eastman Dental Institute for Oral Health Care Sciences, University of London, UK
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Morioka M, Hinode D, Nagata A, Hayashi H, Ichimiya S, Ueda M, Kido R, Nakamura R. Cytotoxicity of Porphyromonas gingivalis toward cultured human gingival fibroblasts. ORAL MICROBIOLOGY AND IMMUNOLOGY 1993; 8:203-7. [PMID: 8247606 DOI: 10.1111/j.1399-302x.1993.tb00560.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Direct cytotoxicity of black-pigmented anaerobic rods was studied on the confluent monolayer of human gingival fibroblasts in vitro. Only strains of Porphyromonas gingivalis caused morphological alteration (cell-rounding) and notable depression of viability of fibroblasts. To determine the location of the cytotoxicity, bacterial surface components, i.e., outer membrane, lipopolysaccharide, fimbriae and outer membrane vesicles were prepared from P. gingivalis and their cytotoxicity was assessed. Among these preparations, only outer membrane vesicles are supposed to have high affinity to human gingival fibroblasts, and the cytotoxicity of outer membrane vesicles was found to be much stronger than that of the other constituents. This cytotoxic factor seemed to consist largely of protein and to be associated with the enzyme activity of outer membrane vesicles. The effects of some protease inhibitors and L-cysteine on the cytotoxicity of outer membrane vesicles suggest that the mechanism of cell-rounding is different from that of cell death.
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Affiliation(s)
- M Morioka
- Department of Preventive Dentistry, School of Dentistry, University of Tokushima, Japan
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14
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Kataoka M, Kawamura K, Kondoh T, Wakano Y, Ishida H. Purification of a fibroblast-inhibitory factor from Actinobacillus actinomycetemcomitans Y4. FEMS Microbiol Lett 1993; 107:111-4. [PMID: 8467993 DOI: 10.1111/j.1574-6968.1993.tb06013.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
A factor showing inhibitory activity against human gingival fibroblasts was extracted from the cytosol fraction of Actinobacillus actinomycetemocimitans Y4. The activity markedly inhibited the proliferation of human gingival fibroblasts, but had no effect on cell viability or gross morphology. No such activity was found in cytosol fractions from either Porphyromonas gingivalis 381 or Escherichia coli HB101. The extract from A. actinomycetemocomitans Y4 was then purified by anion-exchange chromatography, hydroxyapatite chromatography and gel-filtration chromatography to give a single band on SDS-PAGE with an apparent molecular mass of 65 kDa. The purification ratio was 183-fold with a recovery rate of 5% compared with the crude extract (starting material) when the activity was assessed by direct cell counts.
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Affiliation(s)
- M Kataoka
- Department of Periodontology and Endodontology, School of Dentistry, University of Tokushima, Japan
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15
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Mihara J, Holt SC. Purification and characterization of fibroblast-activating factor isolated from Porphyromonas gingivalis W50. Infect Immun 1993; 61:588-95. [PMID: 8380795 PMCID: PMC302768 DOI: 10.1128/iai.61.2.588-595.1993] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
A 24-kDa polypeptide which activated the incorporation of [3H]thymidine into human fibroblasts was isolated from the outer membrane vesicles of Porphyromonas gingivalis W50. This polypeptide, named fibroblast activating factor (FAF), was isolated by 3-[(3-cholamidopropyl)-dimethyl-ammonio]-1-propane-sulfonate (CHAPS) detergent extraction and purified by DEAE ion-exchange chromatography and preparative isoelectric focusing. Purified FAF (100 ng of protein per ml) caused a 400% increase in [3H]thymidine incorporation into human gingival fibroblasts (HGFs) compared with results for controls. FAF was characterized as (i) a polypeptide with molecular masses of 24 kDa when heated at 100 degrees C for 5 min and 44 kDa when unheated, (ii) heat sensitive but not affected by selected reducing reagents, and (iii) possessing slight phosphatase activity. N'-terminal sequence analysis revealed no homology with P. gingivalis peptides or with any host-derived growth factors. These data suggest that FAF functions as a significant virulence factor which in vivo is capable of modulating homeostasis in local connective tissues.
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Affiliation(s)
- J Mihara
- Department of Periodontics, University of Texas Health Science Center, San Antonio 78284-7894
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16
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Bartold PM, Narayanan AS, Page RC. Platelet-derived growth factor reduces the inhibitory effects of lipopolysaccharide on gingival fibroblast proliferation. J Periodontal Res 1992; 27:499-505. [PMID: 1403578 DOI: 10.1111/j.1600-0765.1992.tb01823.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Lipopolysaccharide from a variety of bacterial sources is known to inhibit gingival fibroblast proliferation and synthetic activity and has been implicated in the pathogenesis of periodontal inflammation. However, it may be involved not only in pathogenesis but also be responsible for delayed wound healing following periodontal therapy. The aim of this investigation was to determine whether the inhibitory effect of LPS on gingival fibroblast proliferation could be reversed by growth factors. Human gingival fibroblasts were cultured in the presence of varying concentrations of platelet-derived growth factor (PDGF) or Salmonella enteritidis LPS to determine the optimal concentrations for stimulation and inhibition of proliferation respectively. The effect of PDGF on LPS inhibition of fibroblast proliferation was studied by combining PDGF and LPS together at the outset of the experimental period or adding PDGF to cells which had been previously primed with LPS. Cell proliferation was monitored by incorporation of 3H-thymidine into precipitable DNA. The results indicated that maximal inhibition of fibroblast proliferation was obtained with 50 micrograms/ml LPS and maximal stimulation of proliferation with 5 ng/ml PDGF. PDGF was found to restore the proliferative activity of the cells exposed to LPS to approximately 60% of their control counterparts. A similar value was obtained for cultures exposed to PDGF after an extended priming period of LPS exposure. Subtle differences were noted in the time taken for cells to complete their cell cycle in the various culture conditions and this may reflect variations in subpopulations of cells in their response to various mitogenic stimuli. Overall the results indicate that PDGF has the capacity to significantly negate and reverse the inhibitory effects of LPS on human gingival fibroblast proliferation.
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Affiliation(s)
- P M Bartold
- Department of Pathology, University of Adelaide, South Australia
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Barber MT, Savage NW, Seymour GJ. The effect of cyclosporin and lipopolysaccharide on fibroblasts: implications for cyclosporin-induced gingival overgrowth. J Periodontol 1992; 63:397-404. [PMID: 1527683 DOI: 10.1902/jop.1992.63.5.397] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Drug-induced gingival overgrowth is an adverse side effect associated principally with 3 different types of drugs; specifically the antiepileptic phenytoin, the calcium channel antagonist nifedipine, and the immunosuppressant cyclosporin. The present study has analyzed the effect of cyclosporin and lipopolysaccharide on fibroblasts from 3 different sources: 1) normal healthy human gingiva (NHGF); 2) overgrown gingiva from 2 patients taking cyclosporin (CHGF); and 3) human fetal lung (WI-38). Fibroblasts isolated from cyclosporin-associated gingival overgrowth were significantly less responsive to cyclosporin in terms of DNA, total protein, and proteoglycan synthesis. This finding supports the in vivo response where few fibroblasts are seen but marked overgrowth of fibrous tissue occurs. Lipopolysaccharide derived from Fusobacterium nucleatum and Escherichia coli was capable of inhibiting DNA synthesis significantly in all 3 fibroblast types. Total protein synthesis by CHGF cells was inhibited differentially by Fusobacterium nucleatum LPS and addition of cyclosporin to this system resulted in reversal of the inhibition. A synergistic effect was noted when the proteoglycan output of NHGF cells was assessed in response to co-incubation with cyclosporin and Escherichia coli LPS. The study shows that bacterial LPS may be an important co-factor in the pathogenesis of cyclosporin-induced gingival overgrowth.
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Affiliation(s)
- M T Barber
- Department of Dentistry, University of Queensland, Brisbane, Australia
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18
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Rahemtulla F. Proteoglycans of oral tissues. CRITICAL REVIEWS IN ORAL BIOLOGY AND MEDICINE : AN OFFICIAL PUBLICATION OF THE AMERICAN ASSOCIATION OF ORAL BIOLOGISTS 1992; 3:135-62. [PMID: 1730068 DOI: 10.1177/10454411920030010301] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- F Rahemtulla
- Department of Oral Biology, University of Alabama School of Dentistry, Birmingham 35294
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19
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Abstract
The ability of human gingival fibroblasts to synthesize interleukin-6 (IL-6) was studied using in vitro and immunohistochemical techniques. Culture supernatants of human gingival fibroblasts contained significant quantities of IL-6 activity which could be stimulated by fetal calf serum, recombinant interleukin-1 beta and lipopolysaccharide. The activity in the supernatants was specifically attributed to IL-6 since up to 97% of the activity could be inhibited by an anti-IL-6 antibody. Immunohistochemical studies on low-density human gingival fibroblast cultures indicated that the cells were associated with material reactive to the anti-IL-6 antibody. This localization was seen on the cell surface and in the cytoplasm of the cells. Immunoreactivity towards IL-6 was also noted in sections of human gingivae. Moderate staining was seen in the connective tissues and lower portions of the gingival epithelium, while intense staining was seen at foci of inflammation. The identification of IL-6 with human gingival tissues and cells implicates this lymphokine in the molecular events associated with the inflammatory periodontal diseases.
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Affiliation(s)
- P M Bartold
- Department of Pathology, University of Adelaide, Australia
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20
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Socransky SS, Haffajee AD. Microbial mechanisms in the pathogenesis of destructive periodontal diseases: a critical assessment. J Periodontal Res 1991; 26:195-212. [PMID: 1831843 DOI: 10.1111/j.1600-0765.1991.tb01646.x] [Citation(s) in RCA: 169] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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21
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Holt SC, Bramanti TE. Factors in virulence expression and their role in periodontal disease pathogenesis. CRITICAL REVIEWS IN ORAL BIOLOGY AND MEDICINE : AN OFFICIAL PUBLICATION OF THE AMERICAN ASSOCIATION OF ORAL BIOLOGISTS 1991; 2:177-281. [PMID: 1912148 DOI: 10.1177/10454411910020020301] [Citation(s) in RCA: 265] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The classic progression of the development of periodontitis with its associated formation of an inflammatory lesion is characterized by a highly reproducible microbiological progression of a Gram-positive microbiota to a highly pathogenic Gram-negative one. While this Gram-negative microbiota is estimated to consist of at least 300 different microbial species, it appears to consist of a very limited number of microbial species that are involved in the destruction of periodontal diseases. Among these "putative periodontopathic species" are members of the genera Porphyromonas, Bacteroides, Fusobacterium, Wolinella, Actinobacillus, Capnocytophaga, and Eikenella. While members of the genera Actinomyces and Streptococcus may not be directly involved in the microbial progression, these species do appear to be essential to the construction of the network of microbial species that comprise both the subgingival plaque matrix. The temporal fluctuation (emergence/disappearance) of members of this microbiota from the developing lesion appears to depend upon the physical interaction of the periodontal pocket inhabitants, as well as the utilization of the metabolic end-products of the respective species intimately involved in the disease progression. A concerted action of the end-products of prokaryotic metabolism and the destruction of host tissues through the action of a large number of excreted proteolytic enzymes from several of these periodontopathogens contribute directly to the periodontal disease process.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- S C Holt
- Department of Periodontics, University of Texas Health Science Center, San Antonio 78284-7894
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22
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Bartold PM. Lipopolysaccharide stimulation of hyaluronate synthesis by human gingival fibroblasts in vitro. Arch Oral Biol 1991; 36:791-7. [PMID: 1763976 DOI: 10.1016/0003-9969(91)90028-s] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Exposure of gingival fibroblasts to LPS caused a dose-dependent increase in hyaluronate synthesis. Stimulation of hyaluronate synthesis by LPS was significantly greater 24 h after exposure and by 48 h an approx. 50% increase was evident. In parallel, there was an increase in the activity of the hyaluronate synthetase enzyme. Inhibition of PGE2 synthesis by indomethacin abolished the stimulatory effect of LPS on hyaluronate synthesis. Thus, this stimulatory effect of LPS on hyaluronic acid synthesis may be a secondary response to the induction of PGE2. The molecular size of newly synthesized hyaluronate was not affected by LPS. The metabolic changes observed may be a primary response of the cells to bacterial toxins and may aid extracellular matrix repair.
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Affiliation(s)
- P M Bartold
- Department of Pathology, University of Adelaide, Australia
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23
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Garg HG, Lyon NB. Structure of collagen fibril-associated, small proteoglycans of mammalian origin. Adv Carbohydr Chem Biochem 1991; 49:239-61. [PMID: 1814173 DOI: 10.1016/s0065-2318(08)60184-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- H G Garg
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Massachusetts General Hospital, Boston
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24
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Hamada S, Takada H, Ogawa T, Fujiwara T, Mihara J. Lipopolysaccharides of oral anaerobes associated with chronic inflammation: chemical and immunomodulating properties. Int Rev Immunol 1990; 6:247-61. [PMID: 2102906 DOI: 10.3109/08830189009056635] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- S Hamada
- Department of Oral Microbiology, Osaka University, Faculty of Dentistry, Japan
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25
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Bartold PM. Regulation of human gingival fibroblast growth and synthetic activity by cyclosporine-A in vitro. J Periodontal Res 1989; 24:314-21. [PMID: 2533256 DOI: 10.1111/j.1600-0765.1989.tb00876.x] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Gingival overgrowth is an adverse side-effect seen in a proportion of patients taking cyclosporin-A which indicates that cyclosporine-A may modulate the activities of cells other than T lymphocytes. Therefore, the effect of cyclosporine on human gingival fibroblasts has been studied in vitro. Cyclosporine-A was found to stimulate DNA synthesis and the proliferative activity of these cells with maximal stimulation noted at a concentration of 10(-9) g/ml. Although this stimulation was most noticeable in the presence of 10% fetal calf serum, proliferation still occurred in serum-free medium. In the presence of lipopolysaccharide, at a concentration which normally inhibits gingival fibroblast proliferation, cyclosporine retained its capacity to stimulate proliferative activity. Fibroblasts isolated from overgrown gingival tissue responded to a greater extent than those isolated from a healthy site from the same individual. This stimulatory effect was not restricted to gingival fibroblasts, since human foreskin fibroblasts responded in a similar fashion. Cyclosporine-A did not significantly alter protein or proteoglycan production by these cells. These responses are considered to reflect the in vivo response of gingival overgrowth in patients taking cyclosporine-A. The reversal of lipopolysaccharide inhibition of gingival fibroblast proliferation by cyclosporine-A may explain, in part, why gingival overgrowth is most prominent in areas of heavy dental plaque accumulation.
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