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Jiang L, Liu MN, Wang GD, Wu Q, Zhao YF. Cyclosporin A suppresses Porphyromonas gingivalis lipopolysaccharide induced matrix metalloproteinases activities in the co-culture of human gingival fibroblasts and monocyte cell line THP-1. Growth Factors 2020; 38:65-74. [PMID: 32321312 DOI: 10.1080/08977194.2020.1755280] [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: 10/24/2022]
Abstract
Cyclosporine-A (CsA) is a widely used immunosuppressant. In this study, we explore the pathway through which CsA suppressed the Porphyromonas gingivalis lipopolysaccharide (P.g-LPS)-induced increase in matrix metalloproteinase (MMP) activities in co-cultured human gingival fibroblasts (HGFs) and THP-1 monocytes. In the co-culture, we found that CsA inhibited the expression of cyclophilin A (CyPA), CD147 and the activities of MMPs, which were all induced by P.g-LPS. We also found that P.g-LPS and recombinant human CyPA increased activation of ERK1/2 and IκB (an NF-κB inhibitory protein), but CsA and the anti-CD147 antibody significantly inhibited these effects. Taken together, CsA in the presence of P.g-LPS might suppress MMP activities by blocking the CyPA/CD147 interaction that results in the inhibition of ERK1/2 and NF-κB signaling by interfering with the phosphorylation of ERK1/2 and IκB.
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Affiliation(s)
- Lei Jiang
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
| | - Min Ni Liu
- Department of Stomatology, Characteristic Medical Center, Second Military Medical University, Shanghai, P. R. China
| | - Guo Dong Wang
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
| | - Qun Wu
- Department of Stomatology, Characteristic Medical Center, Second Military Medical University, Shanghai, P. R. China
| | - Yun Fu Zhao
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
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Aoudjehane L, Boelle PY, Bisch G, Delelo R, Paye F, Scatton O, Housset C, Becquart J, Calmus Y, Conti F. Development of an in vitro model to test antifibrotic drugs on primary human liver myofibroblasts. J Transl Med 2016; 96:672-9. [PMID: 26950484 DOI: 10.1038/labinvest.2016.36] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 12/28/2015] [Accepted: 01/11/2016] [Indexed: 02/08/2023] Open
Abstract
We have developed a culture model to assess antifibrotic drugs using normal human liver myofibroblasts (HLMFs) obtained from 31 subjects. Activation was evaluated in terms of α-smooth muscle actin (α-SMA) and collagen 1 (Coll1) expression using RT-PCR, and proliferation as the uptake of 5-ethynil-2'-deoxyuridine. Under analysis of variance, between-subject differences accounted for 70% of all variability and inter-experiment differences for 30%. The sensitivity of the model was determined by quantifying the effects in terms of relative expression, which were 0.74±0.03 for cyclosporine A (CsA) and 2.4±0.10 for transforming growth factor-beta (TGF-β) (P<0.0001 vs no treatment) for α-SMA expression. Inter-subject variations in α-SMA and Coll1 expression enabled the classification of subjects as potentially low or high fibrosers. Finally, we observed that pirfenidone (which has beneficial effects in vivo) significantly reduced the expressions of α-SMA and Coll1, whereas the angiotensin-converting enzyme inhibitor losartan (which has no effect in vivo) had no significant effect. Our model may thus detect the antifibrotic properties of drugs. Antifibrotic drugs with promising clinical relevance could possibly be selected using a bank of HLMFs from high fibrosers.
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Affiliation(s)
- Lynda Aoudjehane
- Human HepCell, Faculté de Médecine Pierre et Marie Curie, Site Saint-Antoine, Paris, France.,Sorbonne Universités, UPMC University Paris 06, Paris, France.,INSERM, UMR_S 938, CDR Saint-Antoine, Paris, France
| | | | - Grégoire Bisch
- Human HepCell, Faculté de Médecine Pierre et Marie Curie, Site Saint-Antoine, Paris, France
| | - Rolland Delelo
- Sorbonne Universités, UPMC University Paris 06, Paris, France.,INSERM, UMR_S 938, CDR Saint-Antoine, Paris, France
| | - François Paye
- Sorbonne Universités, UPMC University Paris 06, Paris, France.,AP-HP, Hôpital Saint Antoine, Service de Chirurgie Digestive, Paris, France
| | - Olivier Scatton
- Sorbonne Universités, UPMC University Paris 06, Paris, France.,INSERM, UMR_S 938, CDR Saint-Antoine, Paris, France.,AP-HP, Hôpital Pitié-Salpêtrière, Servie de Chirurgie Digestive et Transplantation Hépatique, Paris, France
| | - Chantal Housset
- Sorbonne Universités, UPMC University Paris 06, Paris, France.,INSERM, UMR_S 938, CDR Saint-Antoine, Paris, France
| | - Jérôme Becquart
- Human HepCell, Faculté de Médecine Pierre et Marie Curie, Site Saint-Antoine, Paris, France
| | - Yvon Calmus
- Sorbonne Universités, UPMC University Paris 06, Paris, France.,INSERM, UMR_S 938, CDR Saint-Antoine, Paris, France.,AP-HP, Hôpital Pitié-Salpêtrière, Unité de Transplantation Hépatique, Paris, France
| | - Filomena Conti
- Sorbonne Universités, UPMC University Paris 06, Paris, France.,INSERM, UMR_S 938, CDR Saint-Antoine, Paris, France.,AP-HP, Hôpital Pitié-Salpêtrière, Unité de Transplantation Hépatique, Paris, France
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Fu MMJ, Fu E, Kuo PJ, Tu HP, Chin YT, Chiang CY, Chiu HC. Gelatinases and Extracellular Matrix Metalloproteinase Inducer Are Associated With Cyclosporin-A-Induced Attenuation of Periodontal Degradation in Rats. J Periodontol 2015; 86:82-90. [DOI: 10.1902/jop.2014.140366] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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4
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Kuo PJ, Tu HP, Chin YT, Lu SH, Chiang CY, Chen RY, Fu E. Cyclosporine-A inhibits MMP-2 and -9 activities in the presence of Porphyromonas gingivalis lipopolysaccharide: an experiment in human gingival fibroblast and U937 macrophage co-culture. J Periodontal Res 2012; 47:431-8. [PMID: 22321150 DOI: 10.1111/j.1600-0765.2011.01450.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUND AND OBJECTIVE Studies have shown that bacterial plaque and the associated gingival inflammation increase the severity of gingival overgrowth induced by cyclosporine-A (CsA). This in vitro study aimed to evaluate the effect of CsA on the activities of MMPs from the co-culture of human gingival fibroblasts and U937 macrophages in the presence or absence of Porphyromonas gingivalis lipopolysaccharide (LPS). MATERIAL AND METHODS Activities of pro-MMP-2, MMP-2 and pro-MMP-9 in the supernatants of independent cultures and co-cultures were examined by zymography. RT-PCR was selected to evaluate the expression of mRNA for membrane type-1 (MT1) MMP in the co-cultures. RESULTS Activities of MMPs in the co-cultures were significantly greater when compared with any of the independent cultures. Lipopolysaccharide significantly increased the MMP activities in a dose-dependent manner in the co-cultures, whereas CsA inhibited these activities. In the presence of both CsA and LPS, the MMP activities inhibited by CsA could still be observed in the co-cultures. In the individual cultures, in contrast, the CsA-inhibited MMP activities, in the presence of LPS, were minimally detected. The mRNA expression of MT1-MMP was significantly enhanced after LPS treatment; however, this enhancement was inhibited by CsA. CONCLUSION This study demonstrated that, in co-cultures of human gingival fibroblasts and U937 macrophages, CsA could inhibit MMP activities in the presence of P. gingivalis LPS. It might be part of the underlying reason for the persistent overgrowth of gingiva seen when bacterial plaque and local inflammation are present during CsA therapy.
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Affiliation(s)
- P-J Kuo
- Department of Periodontology, China Medical University, Taichung, Taiwan
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Chiu HC, Lu YT, Chin YT, Tu HP, Chiang CY, Gau CH, Nieh S, Fu E. Cyclosporine A inhibits the expression of membrane type-I matrix metalloproteinase in gingiva. J Periodontal Res 2009; 44:338-47. [PMID: 19210333 DOI: 10.1111/j.1600-0765.2008.01126.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
BACKGROUND AND OBJECTIVE Membrane type-I matrix metalloproteinase (MMP) and tissue inhibitor of metalloproteinase-2 (TIMP-2) regulate the activation of MMP-2; however, their roles in the activation of MMP-2 in gingiva during treatment with cyclosporine A are still unknown. Therefore, the expressions of membrane type-I MMP and TIMP-2, as well as MMP-2, in gingivae upon treatment with cyclosporine A were examined in vivo and in vitro. MATERIAL AND METHODS Thirty-four rats were divided into two groups after edentulous ridges were established. The experimental group received 30 mg/kg/d of cyclosporine A and the control group received vehicle. At the end of the experimental period, the rats were killed, the gingivae were obtained and the expression of mRNA and protein of membrane type-I MMP, TIMP-2 and MMP-2 in gingiva were examined using real-time polymerase chain reaction and immunohistochemistry. In human gingival fibroblasts, the activity of MMP-2 and the expression of MMP-2, membrane type-I MMP and TIMP-2 mRNAs were examined (using zymography and reverse transcription-polymerase chain reaction, respectively) after treatment with cyclosporine A. RESULTS In gingivae of rats, cyclosporine A significantly decreased the expression of mRNA and protein of membrane type-I MMP, but not of TIMP-2. The expression of MMP-2 mRNA was unaffected but the expression of MMP-2 protein showed a significant decrease upon treatment with cyclosporine A. In fibroblast culture medium, the presence of cyclosporine A induced a decrease in MMP-2 activity in a dose-dependent manner. The expression of MMP-2, membrane type-I MMP and TIMP-2 mRNAs in fibroblasts was not significantly affected by cyclosporine A; however, in fibroblasts the ratio of mRNA expression of membrane type-I MMP to that of TIMP-2 decreased as the cyclosporine A dose was increased. CONCLUSION Cyclosporine A inhibits the expression of membrane type-I MMP in gingiva and it may further reduce the activation of MMP-2.
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Affiliation(s)
- H-C Chiu
- Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei, Taiwan, China
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6
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Chan MWC, Arora PD, McCulloch CA. Cyclosporin inhibition of collagen remodeling is mediated by gelsolin. Am J Physiol Cell Physiol 2007; 293:C1049-58. [PMID: 17615162 DOI: 10.1152/ajpcell.00027.2007] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cyclosporin A (CsA) inhibits collagen remodeling by interfering with the collagen-binding step of phagocytosis. In rapidly remodeling connective tissues such as human periodontium this interference manifests as marked tissue overgrowth and loss of function. Previous data have shown that CsA inhibits integrin-induced release of Ca(2+) from internal stores, which is required for the binding step of collagen phagocytosis. Because gelsolin is a Ca(2+)-dependent actin-severing protein that mediates collagen phagocytosis, we determined whether gelsolin is a CsA target. Compared with vehicle controls, CsA treatment of wild-type mice increased collagen accumulation by 60% in periodontal tissues; equivalent increases were seen in vehicle-treated gelsolin-null mice. Collagen degradation by phagocytosis in cultured gelsolin wild-type fibroblasts was blocked by CsA, comparable to levels of vehicle-treated gelsolin-null fibroblasts. In wild-type cells treated with CsA, collagen binding was similar to that of gelsolin-null fibroblasts transfected with a gelsolin-severing mutant and treated with vehicle. CsA blocked collagen-induced Ca(2+) fluxes subjacent to bound collagen beads, gelsolin recruitment, and actin assembly at bead sites. CsA reduced gelsolin-dependent severing of actin in wild-type cells to levels similar to those in gelsolin-null fibroblasts. We conclude that CsA-induced accumulation of collagen in the extracellular matrix involves disruption of the actin-severing properties of gelsolin, thereby inhibiting the binding step of collagen phagocytosis.
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Nakajima K, Iwagaki M, Ikeda M, Kodama H. Two cases of diabetic scleredema that responded to PUVA therapy. J Dermatol 2006; 33:820-2. [PMID: 17074003 DOI: 10.1111/j.1346-8138.2006.00188.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Lee JY, Kang WH. Effect of cyclosporin A on melanogenesis in cultured human melanocytes. PIGMENT CELL RESEARCH 2003; 16:504-8. [PMID: 12950728 DOI: 10.1034/j.1600-0749.2003.00081.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Cyclosporin A (CsA) is a widely used immunosuppressant. Reports on the effect of CsA on hyperpigmentation in patients appear inconsistent, and the effect of CsA on skin pigment cells (melanocytes) in vitro is unknown. We examined the effect of CsA on human melanocyte proliferation and melanogenesis in vitro. Melanocyte proliferation was dose-dependently inhibited by 0.1-10 microM CsA, with no effect on cell viability. Melanocytes incubated with 10 microM CsA for 6 days showed decreased pigmentation and tyrosinase activity. Western blot analysis using an anti-tyrosinase antibody revealed that CsA (0.1-10 microM) decreased tyrosinase protein levels in a dose-dependent manner. Northern blot analysis showed similar effects on tyrosinase mRNA levels. These effects of CsA on melanogenesis in vitro are not consistent with suggestions that systemic CsA therapy causes patient skin hyperpigmentation.
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Affiliation(s)
- Ji Yeoun Lee
- Department of Dermatology, Ajou University School of Medicine, Suwon, South Korea
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Spolidorio LC, Spolidorio DM, Benatti C, Sampaio JE, Almeida OP. Combined effects of cyclosporin and nifedipine on gingival overgrowth in rats is not age dependent. J Periodontal Res 2003; 38:375-9. [PMID: 12828653 DOI: 10.1034/j.1600-0765.2003.00014.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND Cyclosporin A and nifedipine cause gingival overgrowth in rat, and the combined use of these drugs increases the overgrowth severity. OBJECTIVE The purpose of this study was to compare gingival overgrowth of rats of differents ages treated with cyclosporin A and nifedipine alone or given concurrently. MATERIALS AND METHODS Rats 15, 30, 60 and 90 d old were treated with 10 mg/kg body weight of cyclosporin A and/or 50 mg/kg body weight of nifedipine in the chow. RESULTS Young rats showed evident gingival overgrowth with nifedipine, cyclosporin A, and cyclosporin A and nifedipine given concurrently. Adult rats did not show significant gingival alterations when treated with cyclosporin A and nifedipine alone. Nevertheless evident gingival overgrowth with alterations of the epithelium and connective tissue were observed when treated simultaneously with cyclosporin A and nifedipine. CONCLUSION These results suggest that the combined effects of cyclosporin A and nifedipine on gingival overgrowth in rat is not age dependent.
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Affiliation(s)
- L C Spolidorio
- Department of Oral Pathology and Periodontology, Dental School, Araraquara, University of State of São Paulo, São Paulo, Brazil.
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Tüter G, Serdar MA, Yalim M, Gürhan IS, Baloş K. Evaluation of matrix metalloproteinase-1 and tissue inhibitor of metalloproteinase-1 levels in gingival fibroblasts of cyclosporin A-treated patients. J Periodontol 2002; 73:1273-8. [PMID: 12479630 DOI: 10.1902/jop.2002.73.11.1273] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
BACKGROUND Cyclosporin A (CsA) is a potent immunosuppressant used to prevent organ transplant rejection and to treat various autoimmune diseases. CsA-induced gingival overgrowth (CsA GO) is the most widely seen side effect of this drug; its pathogenesis is not completely understood. The aim of this study was to identify and compare matrix metalloproteinase-1 (MMP-1) and tissue inhibitor of metalloproteinase-1 (TIMP-1) levels in gingival fibroblast cultures of tissues derived from renal transplant patients receiving CsA and exhibiting gingival overgrowth and from periodontally healthy control subjects. METHODS Gingival overgrowth samples were obtained from patients undergoing therapy with CsA, and control tissues were obtained from systemically healthy donors. Gingival fibroblasts were grown using explant cultures. Three different study groups were identified: 1) CsA GO fibroblast culture; 2) CsA-treated healthy gingival fibroblast culture (H+CsA); and 3) healthy gingival fibroblast culture (H). The levels of MMP-1 and TIMP-1 in these groups of gingival fibroblasts were analyzed by enzyme-linked immunoabsorbent assay (ELISA). RESULTS The levels of TIMP-1 were significantly lower in CsA GO than H (P < 0.05). There was no statistically significant difference in the levels of MMP-1 between H and CsA GO (P = 0.505). The ratio of MMP-1 to TIMP-1 was significantly higher in CsA GO than H (P < 0.05). CONCLUSIONS The results of this study indicate that CsA therapy does not have a significant effect on MMP-1 levels. However, low TIMP-1 levels can be an important factor in the pathogenesis of CsA GO, since the balance between MMP-1 and TIMP-1 levels was changed by CsA.
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Affiliation(s)
- Gülay Tüter
- Gazi University, Faculty of Dentistry, Department of Periodontology, Ankara, Turkey.
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Silva HC, Coletta RD, Jorge J, Bolzani G, de Almeida OP, Graner E. The effect of cyclosporin A on the activity of matrix metalloproteinases during the healing of rat molar extraction wounds. Arch Oral Biol 2001; 46:875-9. [PMID: 11420061 DOI: 10.1016/s0003-9969(01)00045-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Cyclosporin A (CyA) is a cyclic peptide used as an immunosuppressive agent because it can block the synthesis of interleukin-2 and other cytokines produced by CD4+ lymphocytes. It is widely used for the prevention of allograft rejection and treatment of autoimmune diseases. Several side-effects of CyA treatment have been reported, among which are chronic nephrotoxicity, hepatotoxicity and neurotoxicity, lymphoproliferative neoplasms, hypertension, thromboembolic complications and gingival overgrowth. Here, using a rat molar model, it is demonstrated that CyA immunosuppression inhibits the activity of matrix metalloproteinases 2 and 9 in the early phase of granulation tissue in the healing dental socket. These observations suggest that CyA may interfere with the wound healing following dental extractions.
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Affiliation(s)
- H C Silva
- Department of Oral Pathology and Genetics, School of Dentistry of Piracicaba, UNICAMP, Avenida Limeira 901, 13414-018, CP 52, SP, Piracicaba, Brazil
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Wondimu B, Modéer T. Cyclosporin A upregulates prostaglandin E2 production in human gingival fibroblasts challenged with tumor necrosis factor alpha in vitro. J Oral Pathol Med 1997; 26:11-6. [PMID: 9021546 DOI: 10.1111/j.1600-0714.1997.tb00003.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The effect of cyclosporin A (CsA) on prostaglandin E2 (PGE2) production in human gingival fibroblasts challenged with tumor necrosis factor alpha (TNF-alpha) was studied. TNF-alpha (1-100 ng/ml) dose-dependently stimulated PGE2 formation in 24 h cultures. CsA (1-100 ng/ml) did not induce PGE2 formation itself but potentiated TNF-alpha induced PGE2 formation in gingival fibroblasts in a manner dependent on the concentrations of both CsA and TNF-alpha. TNF-alpha (10 ng/ml) stimulated the release of [3H]-arachidonic acid (AA) from prelabelled fibroblasts that was potentiated by CsA (100 ng/ml). Addition of exogenous unlabelled AA (5-20 microM/ml) to the cells resulted in enhanced PGE2 formation that was not potentiated by CsA (100 ng/ml). Furthermore, CsA (100 ng/ml) did not further increase the level of cyclooxygenase-2 mRNA induced by TNF-alpha (10 ng/ml), although PGE2 formation was enhanced. The results indicate that CsA and TNF-alpha act in concert on PGE2 formation in gingival fibroblasts, which may be of importance in the pathogenesis of gingival overgrowth induced by the drug.
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Affiliation(s)
- B Wondimu
- Department of Pediatric Dentistry, Faculty of Odontology, Karolinska Institute, Huddinge, Sweden
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Mattheou-Vakali G, Ioannides D, Thomas T, Lazaridou E, Tsogas P, Minas A. Cyclosporine in scleredema. J Am Acad Dermatol 1996; 35:990-1. [PMID: 8959964 DOI: 10.1016/s0190-9622(96)90129-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- G Mattheou-Vakali
- Department of Dermatology, Aristotle University Medical School, Greece
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Piontek M, Porschen R. Growth inhibition of human gastrointestinal cancer cells by cyclosporin A. J Cancer Res Clin Oncol 1994; 120:695-9. [PMID: 7798292 DOI: 10.1007/bf01194265] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We have studied the ability of cyclosporin A (CsA) to inhibit the growth of human AGS gastric and HT29 colon carcinoma cells in vitro. Using continuous drug exposure in growth assays of cultured tumour cells we found that CsA produced a dose-dependent growth inhibition in gastric and colon cancer cells with a half-maximal effect at 5 microM and 6 microM CsA respectively. The growth inhibition of CsA was reversible in AGS cells, when the tumour cells were incubated in normal growth medium following CsA treatment. Trypan blue dye exclusion in AGS cells indicated a cytostatic rather than a cytotoxic effect in the concentration range used. Coincubation of CsA-treated cells with 10-400 U/ml interleukin-2 (IL-2) could not abrogate this growth inhibition, suggesting an IL-2 independent mechanism of action. Flow-cytometric analysis did not reveal a phase arrest of the gastric cancer cells within the cell cycle. We conclude from our experiments that CsA cytostatically and reversibly inhibits the growth of human gastric cancer cells in a dose-dependent manner. In contrast to its mechanism of action in lymphocytes, this direct antiproliferative effect of CsA seems not to be mediated by an IL-2-dependent pathway or a cell-cycle-phase arrest of the tumour cells.
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Affiliation(s)
- M Piontek
- Department of Gastroenterology, Heinrich-Heine-University, Düsseldorf, Germany
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