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Colonization of distant organs by tumor cells generating circulating homotypic clusters adaptive to fluid shear stress. Sci Rep 2021; 11:6150. [PMID: 33731803 PMCID: PMC7969766 DOI: 10.1038/s41598-021-85743-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 03/04/2021] [Indexed: 01/31/2023] Open
Abstract
Once disseminated tumor cells (DTCs) arrive at a metastatic organ, they remain there, latent, and become seeds of metastasis. However, the clonal composition of DTCs in a latent state remains unclear. Here, we applied high-resolution DNA barcode tracking to a mouse model that recapitulated the metastatic dormancy of head and neck squamous cell carcinoma (HNSCC). We found that clones abundantly circulated peripheral blood dominated DTCs. Through analyses of multiple barcoded clonal lines, we identified specific subclonal population that preferentially generated homotypic circulating tumor cell (CTC) clusters and dominated DTCs. Despite no notable features under static conditions, this population significantly generated stable cell aggregates that were resistant to anoikis under fluid shear stress (FSS) conditions in an E-cadherin-dependent manner. Our data from various cancer cell lines indicated that the ability of aggregate-constituting cells to regulate cortical actin-myosin dynamics governed the aggregates' stability in FSS. The CTC cluster-originating cells were characterized by the expression of a subset of E-cadherin binding factors enriched with actin cytoskeleton regulators. Furthermore, this expression signature was associated with locoregional and metastatic recurrence in HNSCC patients. These results reveal a biological selection of tumor cells capable of generating FSS-adaptive CTC clusters, which leads to distant colonization.
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Liu C, Tang S, Niu G, Zhang J, Huang X, Zhang Y, Bi Y. Ex vivo construction of rabbit corneal endothelial cell sheets on a porcine descemet membrane graft. Exp Ther Med 2019; 18:242-252. [PMID: 31258659 PMCID: PMC6566242 DOI: 10.3892/etm.2019.7573] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 03/26/2019] [Indexed: 11/10/2022] Open
Abstract
The aim of the present study was to investigate the feasibility of a new graft construction method using rabbit corneal endothelial cells (RCECs) and a porcine descemet membrane (DM) carrier. RCECs were isolated and the experimental group was treated with Y-27632, whereas the control group were cultured in medium without Y-27632. RCEC morphology was observed using an inverted microscope, and cell proliferation and apoptosis were detected by flow cytometry. To confirm the presence of RCECs, reverse transcription-quantitative PCR was used to detect gene expression levels of Na+-K+-ATPase, aquaporin 1, collagen α2 (IV), collagen α1 (VIII) and keratin-12. Histocompatibility testing was used to detect porcine DM antigenicity. A DM-RCEC graft was constructed, and morphology was observed using alizarin red-trypan blue and haematoxylin and eosin staining. Cell membrane potential was measured to evaluate the physical function of the DM-RCEC graft. Complex graft tension was measured using a modified tension detector and compared with fresh porcine DM-endothelium complex. In vitro-cultured RCECs formed a monolayer with a polygon morphology and cobblestone-like arrangement. In vitro-cultured RCECs exhibited typical RCEC characteristics before and after transplantation. The proliferation rates of the experimental and control groups were 62.68 and 34.50%, respectively (P<0.05); the apoptosis rates of the experimental and control groups were 8.99 and 35.68%, respectively (P<0.05). There was no antigenicity observed with the porcine DM. The action potential amplitude of the experimental and control groups was over −80 mV, reflecting normal RCEC physiological function. The tension measurements of the experimental and control groups were 20.0248±1.048 and 20.5013±0.657 g, respectively (P>0.05). Taken together, the results of the present study demonstrated that Y-27632 enhanced RCEC proliferation. In addition, the findings revealed the successful ex vivo construction of a RCEC sheet on a porcine DM graft.
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Affiliation(s)
- Chunyu Liu
- Department of Ophthalmology, Tongji Hospital Affiliated with Tongji University School of Medicine, Shanghai 200333, P.R. China
| | - Shenfei Tang
- Department of Ophthalmology, Tongji Hospital Affiliated with Tongji University School of Medicine, Shanghai 200333, P.R. China
| | - Guozhen Niu
- Department of Ophthalmology, Tongji Hospital Affiliated with Tongji University School of Medicine, Shanghai 200333, P.R. China
| | - Juan Zhang
- Department of Ophthalmology, Tongji Hospital Affiliated with Tongji University School of Medicine, Shanghai 200333, P.R. China
| | - Xinyu Huang
- Department of Ophthalmology, Tongji Hospital Affiliated with Tongji University School of Medicine, Shanghai 200333, P.R. China
| | - Yushan Zhang
- Department of Ophthalmology, Tongji Hospital Affiliated with Tongji University School of Medicine, Shanghai 200333, P.R. China
| | - Yanlong Bi
- Department of Ophthalmology, Tongji Hospital Affiliated with Tongji University School of Medicine, Shanghai 200333, P.R. China
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Nakagawa H, Yui Y, Sasagawa S, Itoh K. Evidence for intrathecal sodium butyrate as a novel option for leptomeningeal metastasis. J Neurooncol 2018; 139:43-50. [PMID: 29626288 DOI: 10.1007/s11060-018-2852-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2017] [Accepted: 03/29/2018] [Indexed: 01/19/2023]
Abstract
INTRODUCTION The prognosis for leptomeningeal metastasis (LM) remains extremely poor regardless of intrathecal chemotherapy with various drugs, and thus, new treatments are necessary. Butyrate is an endogenous 4-carbon saturated fatty acid, has been investigated as an anti-tumor agent because of its multiple suppressive effects on several tumors. In this study, we investigated the cellular basis of sodium butyrate (SB), a sodium salt compound of butyrate, in vitro and evaluated the clinical potential of intrathecal SB administration for LM in vivo. METHODS We examined SB's effects on Walker 256 rat mammary tumor cells with regard to cytotoxicity, cell morphology, colony formation, migration, and invasion. We also examined SB's neurotoxicity for primary neurons and primary astrocytes. We finally evaluated the potency of continuous intrathecal SB administration in rats with intrathecally transplanted breast tumors as an LM model. RESULTS Physiological SB concentrations (2-4 mM) induced growth suppression, morphological changes, and inhibition of migration and invasion, but did not exhibit neurotoxic effects on primary neurons and astrocytes. Continuous intrathecal SB administration in a rat LM model significantly increased survival periods with little neurotoxicity. CONCLUSIONS Continuous intrathecal SB administration significantly improved prognoses in a rat LM model, which suggests that SB is a promising therapy for LM.
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Affiliation(s)
- Hidemitsu Nakagawa
- Department of Neurosurgery, Nozaki Tokushukai Hospital, Tanigawa 2-10-50, Daito, Osaka, 574-0074, Japan.
- Research Institute, Nozaki Tokushukai Hospital, Tanigawa 2-10-50, Daito, Osaka, Japan.
| | - Yoshihiro Yui
- Research Institute, Nozaki Tokushukai Hospital, Tanigawa 2-10-50, Daito, Osaka, Japan
| | - Satoru Sasagawa
- Research Institute, Nozaki Tokushukai Hospital, Tanigawa 2-10-50, Daito, Osaka, Japan
| | - Kazuyuki Itoh
- Research Institute, Nozaki Tokushukai Hospital, Tanigawa 2-10-50, Daito, Osaka, Japan
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Zhang X, Wu N. Fasudil inhibits proliferation and migration of Hep-2 laryngeal carcinoma cells. DRUG DESIGN DEVELOPMENT AND THERAPY 2018; 12:373-381. [PMID: 29503530 PMCID: PMC5825979 DOI: 10.2147/dddt.s147547] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Background Rho-kinase signal pathway is a new target for cancer therapy. Fasudil, a selective Rho-kinase inhibitor, is found to exert antitumor effects on several types of cancer, but whether fasudil has antitumor effects on laryngeal carcinoma is still unknown. The aim of this study was to determine the effects of fasudil on laryngeal carcinoma and explore the underlying molecular mechanisms in this process. Methods After treatment with fasudil, changes in biological behaviors, including the growth, proliferation, clone formation, apoptosis, and migration of human laryngeal carcinoma cells (Hep-2 cells) were observed. The influences on apoptotic protease activity factor-1 (APAF-1)-mediated apoptosis pathway and the activities of matrix metalloproteinases (MMP-2 and MMP-9) were measured by Western blotting and gelatin zymography assay. Results Half-maximal inhibitory concentration of fasudil to Hep-2 cells was ~3.40×103 µM (95% CI: 2.53-4.66×103 µM). Moreover, fasudil treatment significantly decreased the ability of growth, proliferation, clone formation, and migration of Hep-2 cells, while remarkably increased the apoptosis rate. Furthermore, the expressions of APAF-1, caspase-9, and caspase-3 significantly increased in fasudil treatment group. Meanwhile, fasudil led to a remarkable decrease in the expressions and activities of MMP-2 and MMP-9. Conclusion Our findings first demonstrate that fasudil not only inhibits the proliferation of laryngeal carcinoma cells through activating APAF-1-mediated apoptosis pathway, but also prevents migration by inhibiting the activities of MMP-2 and MMP-9. Therefore, fasudil is an attractive antitumor drug candidate for the treatment of laryngeal carcinoma.
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Affiliation(s)
- Xiaowen Zhang
- Medical Research Center, Shengjing Hospital of China Medical University, Shenyang, China
| | - Nan Wu
- The Core Laboratory for Public Health Science and Practice, The First Affiliated Hospital of China Medical University, Shenyang, China
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Nakagawa H, Sasagawa S, Itoh K. Sodium butyrate induces senescence and inhibits the invasiveness of glioblastoma cells. Oncol Lett 2017; 15:1495-1502. [PMID: 29434841 PMCID: PMC5776921 DOI: 10.3892/ol.2017.7518] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 10/20/2017] [Indexed: 01/24/2023] Open
Abstract
Sodium butyrate (SB), a short chain (C-4) saturated fatty acid, is present in the human bowel at increased concentrations (~2 mM) as a food metabolite. It has been demonstrated that SB exerts an anti-tumor effect as a histone deacetylase inhibitor; however, its precise mechanism of action remains to be elucidated. The present study focused on the mechanisms underlying the effects of SB on glioblastoma (GB) cell proliferation, motility and invasion. In human GB A172 cells, flow cytometry and a Boyden chamber assay demonstrated that physiological concentrations of SB (0.25–4.00 mM) dose-dependently inhibited cell proliferation and invasion. SB also affected cellular morphology, with increases in cell area and the number of focal adhesions observed. However, the phosphorylation (Y397 site) of focal adhesion kinase (FAK) was increased, while that of myosin light chain (S19 site) was unaltered. All of these SB-induced effects were reversible and attenuated following SB withdrawal. In addition, A172 cells treated with SB exhibited positivity for senescence-associated (SA) β-galactosidase (gal) staining and elevated protein expression of p53 and p21 in a time- and dose-dependent manner, whereas the expression of p21 mRNA decreased. Knockdown of p21 expression using small interfering RNA reversed the inhibition of cell growth inhibition and positivity for SA β-gal staining, but did not reverse the inhibition of cell motility and enhanced phosphorylation of FAK. This suggests that cells require p21 to induce senescence but not for SB-mediated decreased motility. Therefore, the current study demonstrated that SB inhibits GB cell proliferation, induces cells to senesce and inhibits tumor cell invasion, indicating that it may be developed as a novel therapeutic strategy to treat GB.
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Affiliation(s)
- Hidemitsu Nakagawa
- Department of Neurosurgery, Nozaki Tokushukai Hospital, Daito, Osaka 574-0074, Japan
| | - Satoru Sasagawa
- Department of Molecular Biology, Research Institute Nozaki Tokushukai, Daito, Osaka 574-0074, Japan
| | - Kazuyuki Itoh
- Department of Molecular Biology, Research Institute Nozaki Tokushukai, Daito, Osaka 574-0074, Japan
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Roy Chowdhury U, Rinkoski TA, Bahler CK, Millar JC, Bertrand JA, Holman BH, Sherwood JM, Overby DR, Stoltz KL, Dosa PI, Fautsch MP. Effect of Cromakalim Prodrug 1 (CKLP1) on Aqueous Humor Dynamics and Feasibility of Combination Therapy With Existing Ocular Hypotensive Agents. Invest Ophthalmol Vis Sci 2017; 58:5731-5742. [PMID: 29114841 PMCID: PMC5678549 DOI: 10.1167/iovs.17-22538] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Purpose Cromakalim prodrug 1 (CKLP1) is a water-soluble ATP-sensitive potassium channel opener that has shown ocular hypotensive properties in ex vivo and in vivo experimental models. To determine its mechanism of action, we assessed the effect of CKLP1 on aqueous humor dynamics and in combination therapy with existing ocular hypotensive agents. Methods Outflow facility was assessed in C57BL/6 mice by ex vivo eye perfusions and by in vivo constant flow infusion following CKLP1 treatment. Human anterior segments with no trabecular meshwork were evaluated for effect on pressure following CKLP1 treatment. CKLP1 alone and in combination with latanoprost, timolol, and Rho kinase inhibitor Y27632 were evaluated for effect on intraocular pressure in C57BL/6 mice and Dutch-belted pigmented rabbits. Results CKLP1 lowered episcleral venous pressure (control: 8.9 ± 0.1 mm Hg versus treated: 6.2 ± 0.1 mm Hg, P < 0.0001) but had no detectable effect on outflow facility, aqueous humor flow rate, or uveoscleral outflow. Treatment with CKLP1 in human anterior segments without the trabecular meshwork resulted in a 50% ± 9% decrease in pressure, suggesting an effect on the distal portion of the conventional outflow pathway. CKLP1 worked additively with latanoprost, timolol, and Y27632 to lower IOP, presumably owing to combined effects on different aspects of aqueous humor dynamics. Conclusions CKLP1 lowered intraocular pressure by reducing episcleral venous pressure and lowering distal outflow resistance in the conventional outflow pathway. Owing to this unique mechanism of action, CKLP1 works in an additive manner to lower intraocular pressure with latanoprost, timolol, and Rho kinase inhibitor Y27632.
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Affiliation(s)
- Uttio Roy Chowdhury
- Department of Ophthalmology, Mayo Clinic, Rochester, Minnesota, United States
| | - Tommy A Rinkoski
- Department of Ophthalmology, Mayo Clinic, Rochester, Minnesota, United States
| | - Cindy K Bahler
- Department of Ophthalmology, Mayo Clinic, Rochester, Minnesota, United States
| | - J Cameron Millar
- North Texas Eye Research Institute, University of North Texas Health Science Center, Fort Worth, Texas, United States
| | - Jacques A Bertrand
- Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Bradley H Holman
- Department of Ophthalmology, Mayo Clinic, Rochester, Minnesota, United States
| | - Joseph M Sherwood
- Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Darryl R Overby
- Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Kristen L Stoltz
- Institute for Therapeutics Discovery and Development, Department of Medicinal Chemistry, University of Minnesota, Minneapolis, Minnesota, United States
| | - Peter I Dosa
- Institute for Therapeutics Discovery and Development, Department of Medicinal Chemistry, University of Minnesota, Minneapolis, Minnesota, United States
| | - Michael P Fautsch
- Department of Ophthalmology, Mayo Clinic, Rochester, Minnesota, United States
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Chen X, Bo L, Lu W, Zhou G, Chen Q. MicroRNA-148b targets Rho-associated protein kinase 1 to inhibit cell proliferation, migration and invasion in hepatocellular carcinoma. Mol Med Rep 2015; 13:477-82. [PMID: 26530325 DOI: 10.3892/mmr.2015.4500] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2015] [Accepted: 09/25/2015] [Indexed: 11/06/2022] Open
Abstract
microRNA(miR)-148b has been found to be downregulated in various human malignancies, including hepatocellular carcinoma (HCC) as well as gastric, pancreatic, colon and oral cancer. However, the function of miR‑148b in HCC has remained elusive. The present study examined the effects of miR‑148b on the proliferation, migration and invasion of HCC cells in vitro. After transfection of the HepG2 and SMMC‑7721 HCC cell lines with miR‑148b, an MTT assay, a Transwell migration and invasion assay as well as western blot analysis were performed. miR-148b was shown to inhibit cell proliferation, migration and invasion in the two cell lines. Using a luciferase reporter assay, the present study also provided the first evidence that miR‑148b directly targets Rho‑associated protein kinase 1 in HCC. These results suggested that miR-148 may represent a novel molecular marker and a potential molecular therapeutic for inhibiting metastasis of HCC.
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Affiliation(s)
- Xian Chen
- Department of Infectious Diseases, The Fourth Affiliated Hospital of Nantong Medical College, Yancheng City No. 1 People's Hospital, Yancheng, Jiangsu 224001, P.R. China
| | - Lianhua Bo
- Department of Infectious Diseases, The Fourth Affiliated Hospital of Nantong Medical College, Yancheng City No. 1 People's Hospital, Yancheng, Jiangsu 224001, P.R. China
| | - Wei Lu
- Department of Infectious Diseases, The Fourth Affiliated Hospital of Nantong Medical College, Yancheng City No. 1 People's Hospital, Yancheng, Jiangsu 224001, P.R. China
| | - Guihua Zhou
- Department of Infectious Diseases, The Fourth Affiliated Hospital of Nantong Medical College, Yancheng City No. 1 People's Hospital, Yancheng, Jiangsu 224001, P.R. China
| | - Qi Chen
- Department of Infectious Diseases, The Fourth Affiliated Hospital of Nantong Medical College, Yancheng City No. 1 People's Hospital, Yancheng, Jiangsu 224001, P.R. China
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8
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Changes in Lipid Metabolism during Walker 256 Tumor Growth and the Therapeutic Effect of Hyperthermia. Bull Exp Biol Med 2014; 156:838-40. [DOI: 10.1007/s10517-014-2464-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Indexed: 10/25/2022]
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Wang J, Liu XH, Yang ZJ, Xie B, Zhong YS. The effect of ROCK-1 activity change on the adhesive and invasive ability of Y79 retinoblastoma cells. BMC Cancer 2014; 14:89. [PMID: 24528629 PMCID: PMC3931292 DOI: 10.1186/1471-2407-14-89] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 02/12/2014] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Retinoblastoma (Rb) is the most common intraocular tumor in childhood worldwide. It is a deadly pediatric eye cancer. The main cause of death in Rb patients is intracranial and systemic metastasis. ROCK is the main downstream effector of Ras-homologous (Rho) family of GTPases which are involved in many cellular functions, such as cell proliferation, invasion and metastasis. Overexpression of ROCK promotes invasion and metastasis of many solid tumors. However, the effect of ROCK in Rb is largely unknown. METHODS ROCK-1 and ROCK-2 mRNA expression in Y79 cell lines were examined by RT-PCR. Protein expression in the Y79 cell line were examined by western blot analyses. ROCK-1 and ROCK-2 siRNA were transfected into Y79 cells with Lipofectamine 2000. Cell proliferation was evaluated by CCK-8 assay after exposure to ROCK inhibitor (Y-27632). We examined the effect of ROCK inhibitors (Y-27632, ROCK-1 and ROCK-2 siRNA) on Y79 cell adhesive capacity by cell adhesion assay. Cell invasion assay through matrigel was used to study the effect of ROCK inhibitors on Y79 cell invasive capacity. RESULTS The expression of mRNA of ROCK-1 was more than that of ROCK-2 in the Y79 cell line. The protein expression levels of ROCK-1 and ROCK-2 were downregulated in the cells transfected with siRNA. Y-27632 treatment didn't lead to any changes of Y79 cells proliferation. Adhesive ability of Y79 cells was enhanced following Y-27632 or ROCK-1 siRNA treatment. The invasive capacity of Y79 cells showed an inverse relationship with increasing Y-27632 concentration. Invasiveness of Y79 cells also decreased in Y79 cells transfected with ROCK-1 siRNA. However, there was no change in adhesive ability or invasive capacity in Y79 cells transfected with siRNA against ROCK-2. CONCLUSIONS The findings of this study demonstrate that ROCK-1 protein plays a key role in regulating metastasis and invasion of Y79 cells, suggesting that the ROCK-1 dependent pathway may be a potential target for therapy of Rb.
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Affiliation(s)
| | | | | | - Bing Xie
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, 197 Ruijin No, 2 Road, Shanghai 200025, PR China.
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10
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Leveraging nanochannels for universal, zero-order drug delivery in vivo. J Control Release 2013; 172:1011-9. [DOI: 10.1016/j.jconrel.2013.09.028] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Revised: 09/23/2013] [Accepted: 09/25/2013] [Indexed: 11/23/2022]
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Mertsch S, Oellers P, Wendling M, Stracke W, Thanos S. Dissecting the inter-substrate navigation of migrating glioblastoma cells with the stripe assay reveals a causative role of ROCK. Mol Neurobiol 2013; 48:169-79. [PMID: 23436115 PMCID: PMC3718996 DOI: 10.1007/s12035-013-8429-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Accepted: 02/06/2013] [Indexed: 11/08/2022]
Abstract
A hallmark of gliomas is the growth and migration of cells over long distances within the brain and proliferation within selected niches, indicating that the migrating cells navigate between complex substrates. We demonstrate in the present study a differential preference for migration that depends on Rho-associated coil kinase (ROCK) signaling, using the alternating Bonhoeffer stripe assay. Membrane fractions from nonmyelinated and myelinated brain areas from female rats, purified myelin also from female rats, and commercial extracellular matrix were used as substrates, with each substrate being tested against the others. The human tumor cell lines exhibited a clear preference for extracellular matrix over all other substrates and for myelinated over nonmyelinated tissue. ROCK signaling was different when cells were cultured on either substrate. The ROCK inhibitor Y27632 significantly attenuated and neutralized the preference for extracellular matrix and myelin, indicating that ROCK controls the substrate selectivity. The findings of this study pave the way for navigation-targeted therapeutics.
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Affiliation(s)
- Sonja Mertsch
- Institute of Experimental Ophthalmology, School of Medicine, Westfalian-Wilhelms University, Albert Schweitzer Campus 1, Building D15, 48149, Münster, Germany.
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Felix FHC, Fontenele JB, Teles MG, Bezerra Neto JE, Santiago MHAM, Picanço Filho RL, Menezes DBD, Viana GSB, Moraes MOD. Cyclosporin safety in a simplified rat brain tumor implantation model. ARQUIVOS DE NEURO-PSIQUIATRIA 2012; 70:52-8. [PMID: 22218474 DOI: 10.1590/s0004-282x2012000100011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2010] [Accepted: 08/12/2011] [Indexed: 11/21/2022]
Abstract
Brain cancer is the second neurological cause of death. A simplified animal brain tumor model using W256 (carcinoma 256, Walker) cell line was developed to permit the testing of novel treatment modalities. Wistar rats had a cell tumor solution inoculated stereotactically in the basal ganglia (right subfrontal caudate). This model yielded tumor growth in 95% of the animals, and showed absence of extracranial metastasis and systemic infection. Survival median was 10 days. Estimated tumor volume was 17.08 ± 6.7 mm(3) on the 7(th) day and 67.25 ± 19.8 mm(3) on 9(th) day post-inoculation. Doubling time was 24.25 h. Tumor growth induced cachexia, but no hematological or biochemical alterations. This model behaved as an undifferentiated tumor and can be promising for studying tumor cell migration in the central nervous system. Dexamethasone 3.0 mg/kg/day diminished significantly survival in this model. Cyclosporine 10 mg/kg/day administration was safely tolerated.
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Affiliation(s)
- Francisco H C Felix
- Pediatric hemato-oncologist, Hospital Infantil Albert Sabin, Fortaleza, CE, Brazil.
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Treatment with Y-27632, a ROCK Inhibitor, Increases the Proinvasive Nature of SW620 Cells on 3D Collagen Type 1 Matrix. Int J Cell Biol 2012; 2012:259142. [PMID: 22690219 PMCID: PMC3368365 DOI: 10.1155/2012/259142] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2012] [Accepted: 03/28/2012] [Indexed: 01/10/2023] Open
Abstract
The concept of using tissue density as a mechanism to diagnose a tumor has been around for centuries. However, this concept has not been sufficiently explored in a laboratory setting. Therefore, in this paper, we observed the effects of cell density and extracellular matrix (ECM) density on colon cancer invasion and proliferation using SW620 cells. We also attempted to inhibit ROCK-I to determine its effect on cell invasion and proliferation using standard molecular biology techniques and advanced imaging. Increasing cell seeding density resulted in a 2-fold increase in cell invasion as well as cell proliferation independent of treatment with Y-27632. Increasing collagen I scaffold density resulted in a 2.5-fold increase in cell proliferation while treatment with Y-27632 attenuated this effect although 1.5 fold increase in cell invasion was observed in ROCK inhibited samples. Intriguingly, ROCK inhibition also resulted in a 3.5-fold increase in cell invasion within 3D collagen scaffolds for cells seeded at lower densities. We show in this paper that ROCK-I inhibition leads to increased invasion within 3D collagen I microenvironments. This data suggests that although ROCK inhibitors have been used clinically to treat several medical conditions, its effect largely depends on the surrounding microenvironment.
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Schmidt LJ, Duncan K, Yadav N, Regan KM, Verone AR, Lohse CM, Pop EA, Attwood K, Wilding G, Mohler JL, Sebo TJ, Tindall DJ, Heemers HV. RhoA as a mediator of clinically relevant androgen action in prostate cancer cells. Mol Endocrinol 2012; 26:716-35. [PMID: 22456196 DOI: 10.1210/me.2011-1130] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Recently, we have identified serum response factor (SRF) as a mediator of clinically relevant androgen receptor (AR) action in prostate cancer (PCa). Genes that rely on SRF for androgen responsiveness represent a small fraction of androgen-regulated genes, but distinguish benign from malignant prostate, correlate with aggressive disease, and are associated with biochemical recurrence. Thus, understanding the mechanism(s) by which SRF conveys androgen regulation to its target genes may provide novel opportunities to target clinically relevant androgen signaling. Here, we show that the small GTPase ras homolog family member A (RhoA) mediates androgen-responsiveness of more than half of SRF target genes. Interference with expression of RhoA, activity of the RhoA effector Rho-associated coiled-coil containing protein kinase 1 (ROCK), and actin polymerization necessary for nuclear translocation of the SRF cofactor megakaryocytic acute leukemia (MAL) prevented full androgen regulation of SRF target genes. Androgen treatment induced RhoA activation, increased the nuclear content of MAL, and led to MAL recruitment to the promoter of the SRF target gene FHL2. In clinical specimens RhoA expression was higher in PCa cells than benign prostate cells, and elevated RhoA expression levels were associated with aggressive disease features and decreased disease-free survival after radical prostatectomy. Overexpression of RhoA markedly increased the androgen-responsiveness of select SRF target genes, in a manner that depends on its GTPase activity. The use of isogenic cell lines and a xenograft model that mimics the transition from androgen-stimulated to castration-recurrent PCa indicated that RhoA levels are not altered during disease progression, suggesting that RhoA expression levels in the primary tumor determine disease aggressiveness. Androgen-responsiveness of SRF target genes in castration-recurrent PCa cells continued to rely on AR, RhoA, SRF, and MAL and the presence of intact SRF binding sites. Silencing of RhoA, use of Rho-associated coiled-coil containing protein kinase 1 inhibitors, or an inhibitor of SRF-MAL interaction attenuated (androgen-regulated) cell viability and blunted PCa cell migration. Taken together, these studies demonstrate that the RhoA signaling axis mediates clinically relevant AR action in PCa.
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Affiliation(s)
- Lucy J Schmidt
- Department of Urology Research, Mayo Clinic, Rochester, Minnesota 55905, USA
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Zakharova LA, Khegai II, Sharova NP, Melnikova VI, Karpova YD, Astakhova TM, Popova NA, Ivanova LN. Pattern of MHC class I and immune proteasome expression in Walker 256 tumor during growth and regression in Brattleboro rats with the hereditary defect of arginine-vasopressin synthesis. Cell Immunol 2011; 271:385-91. [PMID: 21889127 DOI: 10.1016/j.cellimm.2011.08.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Revised: 06/23/2011] [Accepted: 08/09/2011] [Indexed: 10/17/2022]
Abstract
Dynamics of the expression of MHC class I, immune proteasomes and proteasome regulators 19S, PA28, total proteasome pool and proteasome chymotrypsin-like activity in Walker 256 tumor after implantation into Brattleboro rats with the hereditary defect of arginine-vasopressin synthesis was studied. The tumor growth and regression in Brattleboro rats were accompanied by changes in the proteasome subunit level unlike the tumor growth in WAG rats with normal expression of arginine-vasopressin gene. In the tumor implanted into Brattleboro rats the immune proteasome level was maximal between days 14 and 17, when the tumor underwent regression. Conversely, the expression of proteasome regulators tended to decrease during this period. Immune proteasomes are known to produce antigen epitopes for MHC class I to be presented to CD8+ T lymphocytes. Enhanced expression of immune proteasomes coincided with the recovery of MHC class I expression, suggesting the efficient presentation of tumor antigens in Brattleboro rats.
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Affiliation(s)
- Liudmila A Zakharova
- NK Koltsov Institute of Developmental Biology, Russian Academy of Sciences, Moscow, Russia
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16
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Mafanasyeva MA, Zakharova LA, Khegai II, Sharova NP, Popova NA, Ivanova LN, Melnikova VI. Restoration of expression of MHC class I molecule in Walker 256 tumor in growth dynamics in Brattleboro rats. DOKL BIOCHEM BIOPHYS 2010; 430:11-3. [PMID: 20380153 DOI: 10.1134/s1607672910010047] [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]
Affiliation(s)
- M A Mafanasyeva
- Kol'tsov Institute of Developmental Biology, Russian Academy of Sciences, ul. Vavilova 26, Moscow, 119334 Russia
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17
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Wang L, Kuang L, Pan X, Liu J, Wang Q, Du B, Li D, Luo J, Liu M, Hou A, Qian M. Isoalvaxanthone inhibits colon cancer cell proliferation, migration and invasion through inactivating Rac1 and AP-1. Int J Cancer 2009; 127:1220-9. [DOI: 10.1002/ijc.25119] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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18
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Wang L, Xue L, Yan H, Li J, Lu Y. Effects of ROCK inhibitor, Y-27632, on adhesion and mobility in esophageal squamous cell cancer cells. Mol Biol Rep 2009; 37:1971-7. [PMID: 19649725 DOI: 10.1007/s11033-009-9645-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2009] [Accepted: 07/21/2009] [Indexed: 11/29/2022]
Abstract
Rho-associated protein kinase (ROCK), a molecular switch, modulates cellular functions in many cancers, such as hepatocellular, breast, colon cancers, etc. However, little is known the effect of ROCK on cell adhesion and mobility in esophageal squamous cell cancer (ESCC), one of the most diagnosed cancers in China. In this study, Y-27632 was used to specifically block ROCK activity in ESCC cells. Adhesion of ESCC cells was detected by homotypic and heterotypic adhesion assay together with examination of E-cadherin expression. Motility of ESCC cells changes were examined by detection of phosphorylated cofilin and observed under confocal microscopy, respectively. We found that Y-27632 increased both heterotypic and homotypic adhesion, and the expression of E-cadherin; decreased phosphorylated cofilin resulting in actin rearrangement in ESCC cells. All these findings indicate that ROCK signaling pathway plays an important role in cell adhesion and mobility, suggesting that it may be used as a potential target for therapy of ESCC.
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Affiliation(s)
- Lili Wang
- Institute of Tumor Molecular Surgery, The First Affiliated Hospital, Zhengzhou University Medical College, 40 Daxue Road, 450052, Zhengzhou, Henan, China
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19
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Khegay II, Popova NA, Ganilova LS, Shnyder EP, Ivanova LN. Dynamics of tumor growth in Brattleboro and WAG rats injected with Walker 256 carcinosarcoma cells in different doses. Bull Exp Biol Med 2008; 145:81-3. [DOI: 10.1007/s10517-008-0001-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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20
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H89 (N-[2-(p-bromocinnamylamino)ethyl]-5-isoquinolinesulfonamide) induces reduction of myosin regulatory light chain phosphorylation and inhibits cell proliferation. Eur J Pharmacol 2008; 590:61-6. [DOI: 10.1016/j.ejphar.2008.05.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2007] [Revised: 05/02/2008] [Accepted: 05/20/2008] [Indexed: 11/21/2022]
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21
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Wong CCL, Wong CM, Ko FCF, Chan LK, Ching YP, Yam JWP, Ng IOL. Deleted in liver cancer 1 (DLC1) negatively regulates Rho/ROCK/MLC pathway in hepatocellular carcinoma. PLoS One 2008; 3:e2779. [PMID: 18648664 PMCID: PMC2464714 DOI: 10.1371/journal.pone.0002779] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2008] [Accepted: 06/30/2008] [Indexed: 11/19/2022] Open
Abstract
Aims Deleted in liver cancer 1 (DLC1), a member of RhoGTPase activating protein (GAP) family, is known to have suppressive activities in tumorigenicity and cancer metastasis. However, the underlying molecular mechanisms of how DLC1 suppresses cell motility have not been fully elucidated. Rho-kinase (ROCK) is an immediate down-stream effector of RhoA in mediating cellular cytoskeletal events and cell motility. In the present study, we aimed to investigate the effects of DLC1 on Rho/ROCK signaling pathway in hepatocellular carcinoma (HCC). Methodology/Principal Findings We demonstrated that DLC1 negatively regulated ROCK-dependent actomyosin contractility. From immumofluorescence study, we found that ectopic expression of DLC1 abrogated Rho/ROCK-mediated cytoskeletal reorganization including formation of stress fibers and focal adhesions. It also downregulated cortical phosphorylation of myosin light chain 2 (MLC2). These inhibitory events by DLC1 were RhoGAP-dependent, as RhoGAP-deficient mutant of DLC1 (DLC1 K714E) abolished these inhibitory events. In addition, from western study, DLC1 inhibited ROCK-related myosin light chain phosphatase targeting unit 1 (MYPT1) phosphorylation at Threonine 853. By examining cell morphology under microscope, we found that ectopic expression of dominant-active ROCK released cells from DLC1-induced cytoskeletal collapse and cell shrinkage. Conclusion Our data suggest that DLC1 negatively regulates Rho/ROCK/MLC2. This implicates a ROCK-mediated pathway of DLC1 in suppressing metastasis of HCC cells and enriches our understanding in the molecular mechanisms involved in the progression of hepatocellular carcinoma.
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Affiliation(s)
- Carmen Chak-Lui Wong
- Department of Pathology, SH Ho Foundation Research Laboratory and Jockey Club Clinical Research Centre, The University of Hong Kong, Hong Kong, China
| | - Chun-Ming Wong
- Department of Pathology, SH Ho Foundation Research Laboratory and Jockey Club Clinical Research Centre, The University of Hong Kong, Hong Kong, China
| | - Frankie Chi-Fat Ko
- Department of Pathology, SH Ho Foundation Research Laboratory and Jockey Club Clinical Research Centre, The University of Hong Kong, Hong Kong, China
| | - Lo-Kong Chan
- Department of Pathology, SH Ho Foundation Research Laboratory and Jockey Club Clinical Research Centre, The University of Hong Kong, Hong Kong, China
| | - Yick-Pang Ching
- Department of Pathology, SH Ho Foundation Research Laboratory and Jockey Club Clinical Research Centre, The University of Hong Kong, Hong Kong, China
| | - Judy Wai-Ping Yam
- Department of Pathology, SH Ho Foundation Research Laboratory and Jockey Club Clinical Research Centre, The University of Hong Kong, Hong Kong, China
| | - Irene Oi-lin Ng
- Department of Pathology, SH Ho Foundation Research Laboratory and Jockey Club Clinical Research Centre, The University of Hong Kong, Hong Kong, China
- * E-mail:
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22
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Sharova NP, Melnikova VI, Khegai II, Karpovaa YD, Dmitrieva SB, Astakhova TM, Afanas'eva MA, Popova NA, Ivanova LN, Zakharova LA. Pattern of proteasome expression in Walker 256 tumor cells after their transplantation into the Brattleboro rats with genetic defect of vasopressin synthesis. DOKL BIOCHEM BIOPHYS 2008; 419:93-7. [PMID: 18505166 DOI: 10.1134/s1607672908020129] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- N P Sharova
- Kol'tsov Institute of Developmental Biology, Russian Academy of Sciences, ul. Vavilova 26, Moscow, 117808 Russia
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23
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Hopkins AM, Pineda AA, Winfree LM, Brown GT, Laukoetter MG, Nusrat A. Organized migration of epithelial cells requires control of adhesion and protrusion through Rho kinase effectors. Am J Physiol Gastrointest Liver Physiol 2007; 292:G806-17. [PMID: 17138966 DOI: 10.1152/ajpgi.00333.2006] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Migration of epithelial cell sheets, a process involving F-actin restructuring through Rho family GTPases, is both physiologically and pathophysiologically important. Our objective was to clarify the mechanisms whereby the downstream RhoA effector Rho-associated coil-coil-forming kinase (ROCK) influences coordinated epithelial cell motility. Although cells exposed to a pharmacological ROCK inhibitor (Y-27632) exhibited increased spreading in wound closure assays, they failed to migrate in a cohesive manner. Two main phenomena were implicated: the formation of aberrant protrusions at the migrating front and the basal accumulation of F-actin aggregates. Aggregates reflected increased membrane affiliation and detergent insolubility of the actin-binding protein ezrin and enhanced coassociation of ezrin with the membrane protein CD44. While F-actin aggregation following ROCK inhibition was recapitulated by inhibiting myosin light chain (MLC) phosphorylation with the MLC kinase inhibitor ML-7, the latter did not influence protrusiveness and, in fact, significantly decreased cell migration. Our results suggest that excessive protrusiveness downstream of ROCK inhibition reflects an influence of ROCK on F-actin stability via LIM kinase 1 (LIMK-1), which phosphorylates and inactivates cofilin. Y-27632 reduced the levels of both active LIMK-1 and inactive cofilin (phospho forms), and expression of a dominant negative LIMK-1 mutant stimulated leading edge protrusiveness. Furthermore, Y-27632-induced protrusions were partially reversed by overexpression of LIMK-1 to restore cofilin phosphorylation. In summary, our results provide new evidence suggesting that adhesive and protrusive events involved in organized epithelial motility downstream of ROCK are separately coordinated through the phosphorylation of (respectively) MLC and cofilin.
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Affiliation(s)
- Ann M Hopkins
- Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia 30322, USA.
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24
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Yuge A, Nasu K, Matsumoto H, Nishida M, Narahara H. Collagen gel contractility is enhanced in human endometriotic stromal cells: a possible mechanism underlying the pathogenesis of endometriosis-associated fibrosis. Hum Reprod 2007; 22:938-44. [PMID: 17204524 DOI: 10.1093/humrep/del485] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Excessive fibrosis is frequently associated with endometriosis. To evaluate the involvement of the extracellular matrix contractility of endometriotic stromal cells (ECSCs) in the pathogenesis of endometriosis-associated fibrosis, we compared the collagen gel contractility of cultured ECSCs with that of normal endometrial stromal cells. To clarify the mechanism underlying collagen gel contraction by ECSCs, we also evaluated the effect of (+)-(R)-trans-4-(1-aminoethyl)-N-(4-pyridyl) cyclohexanecarboxamide dihydrochloride, monohydrate (Y-27632), a selective Rho-associated coiled-coil-forming protein kinase (ROCK) inhibitor, on the collagen gel contraction by ECSCs. METHODS AND RESULTS ECSCs showed enhanced collagen gel contractility in comparison with NESCs. Myofibroblastic differentiation and the increased expression of fibronectin, RhoA, ROCK-I and ROCK-II proteins were observed with ECSCs using the 3D culture. Y-27632 significantly inhibited the collagen gel contractility of ECSCs without cytotoxicity. CONCLUSIONS The present findings suggest that the enhanced collagen contractility in ECSCs is associated with myofibroblastic differentiation, the increased expression of fibronectin and the activation of the Rho-ROCK-mediated signalling pathway, all of which may be involved in the pathogenesis of endometriosis-associated fibrosis. These results suggest that the inhibition of the Rho-ROCK-mediated signalling pathway may provide a novel strategy for the treatment of this disease. In addition, our experimental system of ECSCs using 3D collagen gel culture would be suitable for evaluating novel treatments for endometriosis.
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Affiliation(s)
- Akitoshi Yuge
- Department of Obstetrics and Gynecology, Faculty of Medicine, Oita University, Yufu-shi, Oita, Japan
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25
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Ying H, Biroc SL, Li WW, Alicke B, Xuan JA, Pagila R, Ohashi Y, Okada T, Kamata Y, Dinter H. The Rho kinase inhibitor fasudil inhibits tumor progression in human and rat tumor models. Mol Cancer Ther 2006; 5:2158-64. [PMID: 16985048 DOI: 10.1158/1535-7163.mct-05-0440] [Citation(s) in RCA: 155] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The ability of cancer cells to undergo invasion and migration is a prerequisite for tumor metastasis. Rho, a Ras-related small GTPase, and the Rho-associated coiled coil-containing protein kinases (Rho kinases, ROCK1 and ROCK2) are key regulators of focal adhesion, actomyosin contraction, and thus cell motility. Inhibitors of this pathway have been shown to inhibit tumor cell motility and metastasis. Here, we show that fasudil [1-(5-isoquinolinesulfonyl)-homopiperazine], an orally available inhibitor of Rho kinases, and its metabolite 1-(hydroxy-5-isoquinoline sulfonyl-homopiperazine) (fasudil-OH) modify tumor cell morphology and inhibit tumor cell migration and anchorage-independent growth. In addition, we show that fasudil inhibited tumor progression in three independent animal models. In the MM1 peritoneal dissemination model, tumor burden and ascites production were reduced by > 50% (P < 0.05). In the HT1080 experimental lung metastasis model, fasudil decreased lung nodules by approximately 40% (P < 0.05). In the orthotopic breast cancer model with MDA-MB-231, there were 3-fold more tumor-free mice in the fasudil-treated group versus saline control group (P < 0.01). Fasudil has been approved for the treatment of cerebral vasospasm and associated cerebral ischemic symptoms. In patients, fasudil is well tolerated without any serious adverse reactions. Therefore, the concept of Rho kinase inhibition as an antimetastatic therapy for cancer can now be clinically explored.
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Affiliation(s)
- Han Ying
- RBA Oncology, Berlex Biosciences, Richmond, CA 94803, USA.
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26
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Joyama S, Naka N, Tsukamoto Y, Yoshikawa H, Itoh K. Dendritic cell immunotherapy is effective for lung metastasis from murine osteosarcoma. Clin Orthop Relat Res 2006; 453:318-27. [PMID: 16906102 DOI: 10.1097/01.blo.0000229347.02834.5e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Susumu Joyama
- Department of Biology, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan
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27
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Khegai II, Popova NA, Zakharova LA, Ivanova LN. Walker 256 tumor growth in rats with hereditary defect of vasopressin synthesis. Bull Exp Biol Med 2006; 142:344-6. [PMID: 17426845 DOI: 10.1007/s10517-006-0362-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Stable deceleration of Walker 256 tumor growth was detected in Brattleboro rats with vasopressin synthesis defect in comparison with normal WAG rats. In contrast to continuous tumor growth typical of rats, the growth of this tumor in Brattleboro rats was negligible and was observed during the first 15-18 days after transplantation, after which the tumor regressed and disappeared. The effect was age-dependent and was more pronounced in old animals. Repeated injection of Walker 256 cells does not lead to tumor development, which attested to direct involvement of the immune system in the detected phenomenon.
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Affiliation(s)
- I I Khegai
- Laboratory of Physiological Genetics, Institute of Cytology and Genetics, Siberian Division of Russian Academy of Sciences, Novosibirsk.
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