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Lai J, Jiang S, Shuai L, Zhang Y, Xia R, Chen Q, Bai L. Comparison of the biological and functional characteristics of mesenchymal stem cells from intrahepatic and identical bone marrow. Stem Cell Res 2021; 55:102477. [PMID: 34343826 DOI: 10.1016/j.scr.2021.102477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 07/11/2021] [Accepted: 07/21/2021] [Indexed: 02/07/2023] Open
Abstract
In our privious work, our reseach group characterized a population of hepatic-sourced mesenchymal stem cells (MSCs) called MLpvNG2+ cells. In the present study, we compared the biological and functional characteristics of naïve MLpvNG2 cells with identical bone marrow-derived MSCs (niBM-MSCs) using in vitro (conditioned media) and in vivo (a well-set diethylnitrosamine (DEN)-induced liver fibrotic/cirrhotic murine model) procedures. The intrahepatic-sourced mesodermal MLpvNG2+ cells exhibited some biological characteristics (e.g., a set of surface markers) similar to those of extrahepatic niBM-MSCs. In responsed to signals of pathological conditions, such as singals of fibrotic/cirrhotic liver, MLpvNG2+ cells showed higher survival and favored differentiation into ALB(+) and G6Pc(+) hepatocytes, whereas niBM-MSCs predominantly differentiated into CK/KRT19(+) cholangiocytes. We identified C/EBPα/β expression as a biological characteristic differentiating these two populations of MSCs, wherein MLpvNG2+ cells are likely regulated by C/EBPβ transcriptional signaling, whereas niBM-MSCs are likely controlled by C/EBPα transcriptional signaling. Notably, although C/EBPα and C/EBPβ transcriptional signaling regulate hepatocyte and cholangiocyte fate, respectively, the expression of these proteins in MLpvNG2+ cells is, to our knowledge, reported for the first time in the present study. We used anti-C/EBP neutralizing antibodies (Abs) both in vitro and in vivo to determine the functional characteristics of these proteins. We conclude that the biological characteristics of these two populations of MSCs depend on their differential C/EBPα/β expression patterns.
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Affiliation(s)
- Jiejuan Lai
- Hepatobiliary Institute, Southwest Hospital, the Army Medical University, No 30 Gaotanyan, ShapingBa Distract, Chongqing 400038, China
| | - Shifang Jiang
- Hepatobiliary Institute, Southwest Hospital, the Army Medical University, No 30 Gaotanyan, ShapingBa Distract, Chongqing 400038, China
| | - Ling Shuai
- Hepatobiliary Institute, Southwest Hospital, the Army Medical University, No 30 Gaotanyan, ShapingBa Distract, Chongqing 400038, China
| | - Yujun Zhang
- Hepatobiliary Institute, Southwest Hospital, the Army Medical University, No 30 Gaotanyan, ShapingBa Distract, Chongqing 400038, China
| | - Renpei Xia
- Hepatobiliary Institute, Southwest Hospital, the Army Medical University, No 30 Gaotanyan, ShapingBa Distract, Chongqing 400038, China
| | - Quanyu Chen
- Hepatobiliary Institute, Southwest Hospital, the Army Medical University, No 30 Gaotanyan, ShapingBa Distract, Chongqing 400038, China; Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, Laboratory of Molecular Developmental Biology, School of Life Sciences, Southwest University, Beibei, Chongqing 400715, China
| | - Lianhua Bai
- Hepatobiliary Institute, Southwest Hospital, the Army Medical University, No 30 Gaotanyan, ShapingBa Distract, Chongqing 400038, China.
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Steuer A, Wende K, Babica P, Kolb JF. Elasticity and tumorigenic characteristics of cells in a monolayer after nanosecond pulsed electric field exposure. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2017; 46:567-580. [PMID: 28365791 DOI: 10.1007/s00249-017-1205-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 03/13/2017] [Accepted: 03/17/2017] [Indexed: 12/14/2022]
Abstract
Nanosecond pulsed electric fields (nsPEFs) applied to cells can induce different biological effects depending on pulse duration and field strength. One known process is the induction of apoptosis whereby nsPEFs are currently investigated as a novel cancer therapy. Another and probably related change is the breakdown of the cytoskeleton. We investigated the elasticity of rat liver epithelial cells WB-F344 in a monolayer using atomic force microscopy (AFM) with respect to the potential of cells to undergo malignant transformation or to develop a potential to metastasize. We found that the elastic modulus of the cells decreased significantly within the first 8 min after treatment with 20 pulses of 100 ns and with a field strength of 20 kV/cm but was still higher than the elasticity of their tumorigenic counterpart WB-ras. AFM measurements and immunofluorescent staining showed that the cellular actin cytoskeleton became reorganized within 5 min. However, both a colony formation assay and a cell migration assay revealed no significant changes after nsPEF treatment, implying that cells seem not to adopt malignant characteristics associated with metastasis formation despite the induced transient changes to elasticity and cytoskeleton that can be observed for up to 1 h.
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Affiliation(s)
- A Steuer
- Leibniz Institute for Plasma Science and Technology, Felix-Hausdorff-Strasse 2, 17489, Greifswald, Germany
| | - K Wende
- Leibniz Institute for Plasma Science and Technology, Felix-Hausdorff-Strasse 2, 17489, Greifswald, Germany
| | - P Babica
- Faculty of Science, Research Centre for Toxic Compounds in the Environment (RECETOX), Masaryk University, Brno, Czech Republic
| | - J F Kolb
- Leibniz Institute for Plasma Science and Technology, Felix-Hausdorff-Strasse 2, 17489, Greifswald, Germany.
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Shi L, Qin E, Zhou J, Zhao J, Nie W, Jiang T, Chen W, Wu D, Huang L, Liu L, Lv L, Zhao M, Zhang Z, Wang F. HIV and HCV Co-Culture Promotes Profibrogenic Gene Expression through an Epimorphin-Mediated ERK Signaling Pathway in Hepatic Stellate Cells. PLoS One 2016; 11:e0158386. [PMID: 27362846 PMCID: PMC4928874 DOI: 10.1371/journal.pone.0158386] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 06/15/2016] [Indexed: 01/06/2023] Open
Abstract
Accelerated fibrosis in patients co-infected with hepatitis C virus (HCV) and human immunodeficiency virus (HIV) has been a major cause of mortality in the highly active anti-retroviral therapy (HAART) era. However, the role of co-infection in accelerating the progression of liver fibrosis, particularly with regard to the effects of co-infection on hepatic stellate cells (HSCs), remains unclear. We hypothesized that HIV and HCV induce liver fibrosis synergistically by altering the regulation of epimorphin production, and thereby indirectly alter HSC function. Here, we examined the effects of epimorphin on HSC proliferation and invasion, and the changes in fibrogenesis-related gene activity in HSCs (LX2) in the presence of inactivated CXCR4-tropic HIV and HCV (JFH1). The combination of HIV and HCV significantly increased epimorphin expression, which increased the proliferation and invasion capabilities of HSCs. Epimorphin also induced the expression of profibrogenic tissue inhibitor of metalloproteinase 1 (TIMP1) in an extracellular signal-regulated kinase (ERK)-dependent manner. These data indicated that the effects of HIV/HCV co-infection on hepatic fibrosis might be mediated in part by EPM. Strategies to limit the expression of EPM might represent a novel therapeutic approach to prevent the progression of hepatic fibrosis during HIV/HCV co-infection.
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Affiliation(s)
- Lei Shi
- Medical School of Chinese PLA, Beijing, China
- Treatment and Research Center for Infectious Diseases, Beijing 302 Hospital, Beijing, China
| | - Enqiang Qin
- Treatment and Research Center for Infectious Diseases, Beijing 302 Hospital, Beijing, China
| | - Junnian Zhou
- Beijing Institute of Transfusion Medicine, Beijing, China
| | - Juanjuan Zhao
- Research Center for Clinical and Translational Medicine, Beijing 302 Hospital, Beijing, China
| | - Weimin Nie
- Treatment and Research Center for Infectious Diseases, Beijing 302 Hospital, Beijing, China
| | - Tianjun Jiang
- Treatment and Research Center for Infectious Diseases, Beijing 302 Hospital, Beijing, China
| | - Weiwei Chen
- Treatment and Research Center for Infectious Diseases, Beijing 302 Hospital, Beijing, China
| | - Dan Wu
- Treatment and Research Center for Infectious Diseases, Beijing 302 Hospital, Beijing, China
| | - Lei Huang
- Treatment and Research Center for Infectious Diseases, Beijing 302 Hospital, Beijing, China
| | - Liying Liu
- Tumor Radiotherapy Center, Beijing 302 Hospital, Beijing, China
| | - Liping Lv
- Beijing Institute of Transfusion Medicine, Beijing, China
| | - Min Zhao
- Treatment and Research Center for Infectious Diseases, Beijing 302 Hospital, Beijing, China
| | - Zheng Zhang
- Medical School of Chinese PLA, Beijing, China
- Research Center for Clinical and Translational Medicine, Beijing 302 Hospital, Beijing, China
- * E-mail: (FW); (ZZ)
| | - Fusheng Wang
- Medical School of Chinese PLA, Beijing, China
- Treatment and Research Center for Infectious Diseases, Beijing 302 Hospital, Beijing, China
- * E-mail: (FW); (ZZ)
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Epimorphin alters the inhibitory effects of SOX9 on Mmp13 in activated hepatic stellate cells. PLoS One 2014; 9:e100091. [PMID: 24971829 PMCID: PMC4074045 DOI: 10.1371/journal.pone.0100091] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 05/22/2014] [Indexed: 01/09/2023] Open
Abstract
Background and Aims Liver fibrosis is a major cause of morbidity and mortality. It is characterised by excessive extracellular matrix (ECM) deposition from activated hepatic stellate cells (HSCs). Although potentially reversible, treatment remains limited. Understanding how ECM influences the pathogenesis of the disease may provide insight into novel therapeutic targets for the disease. The extracellular protein Epimorphin (EPIM) has been implicated in tissue repair mechanisms in several tissues, partially, through its ability to manipulate proteases. In this study, we have identified that EPIM modulates the ECM environment produced by activated hepatic stellate cells (HSCs), in part, through down-regulation of pro-fibrotic Sex-determining region Y-box 9 (SOX9). Methods Influence of EPIM on ECM was investigated in cultured primary rat HSCs. Activated HSCs were treated with recombinant EPIM or SOX9 siRNA. Core fibrotic factors were evaluated by immunoblotting, qPCR and chromatin immunoprecipitation (ChIP). Results During HSC activation EPIM became significantly decreased in contrast to pro-fibrotic markers SOX9, Collagen type 1 (COL1), and α- Smooth muscle actin (α-SMA). Treatment of activated HSCs with recombinant EPIM caused a reduction in α-SMA, SOX9, COL1 and Osteopontin (OPN), while increasing expression of the collagenase matrix metalloproteinase 13 (MMP13). Sox9 abrogation in activated HSCs increased EPIM and MMP13 expression. Conclusion These data provide evidence for EPIM and SOX9 functioning by mutual negative feedback to regulate attributes of the quiescent or activated state of HSCs. Further understanding of EPIM's role may lead to opportunities to modulate SOX9 as a therapeutic avenue for liver fibrosis.
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Liu WH, Ren LN, Chen T, Liu LY, Tang LJ. Stages based molecular mechanisms for generating cholangiocytes from liver stem/progenitor cells. World J Gastroenterol 2013; 19:7032-7041. [PMID: 24222945 PMCID: PMC3819537 DOI: 10.3748/wjg.v19.i41.7032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 09/01/2013] [Accepted: 09/17/2013] [Indexed: 02/06/2023] Open
Abstract
Except for the most organized mature hepatocytes, liver stem/progenitor cells (LSPCs) can differentiate into many other types of cells in the liver including cholangiocytes. In addition, LSPCs are demonstrated to be able to give birth to other kinds of extra-hepatic cell types such as insulin-producing cells. Even more, under some bad conditions, these LSPCs could generate liver cancer stem like cells (LCSCs) through malignant transformation. In this review, we mainly concentrate on the molecular mechanisms for controlling cell fates of LSPCs, especially differentiation of cholangiocytes, insulin-producing cells and LCSCs. First of all, to certificate the cell fates of LSPCs, the following three features need to be taken into account to perform accurate phenotyping: (1) morphological properties; (2) specific markers; and (3) functional assessment including in vivo transplantation. Secondly, to promote LSPCs differentiation, systematical attention should be paid to inductive materials (such as growth factors and chemical stimulators), progressive materials including intracellular and extracellular signaling pathways, and implementary materials (such as liver enriched transcriptive factors). Accordingly, some recommendations were proposed to standardize, optimize, and enrich the effective production of cholangiocyte-like cells out of LSPCs. At the end, the potential regulating mechanisms for generation of cholangiocytes by LSPCs were carefully analyzed. The differentiation of LSPCs is a gradually progressing process, which consists of three main steps: initiation, progression and accomplishment. It’s the unbalanced distribution of affecting materials in each step decides the cell fates of LSPCs.
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The Compatibility of Swine BMDC-derived Bile Duct Endothelial Cells with a Nanostructured Electrospun PLGA Material. Int J Artif Organs 2013; 36:121-30. [PMID: 23335380 DOI: 10.5301/ijao.5000181] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/29/2012] [Indexed: 11/20/2022]
Abstract
Purpose To investigate the production of bile duct endothelial cells via directed differentiation of porcine bone marrow mesenchymal stem cells (BMSCs) down the hepatic lineage in vitro and the biocompatibility of differentiated bile duct endothelial cells with electrospun nanofibers. Methods Porcine BMSCs were differentiated in vitro into bile duct endothelial cells, which were identified by morphology and RT-PCR. PLGA nanofiber membranes were prepared by electrospinning. The morphology was detected by scanning electron microscopy and the short-term (two weeks) in vitro degradation rate was determined. Adhesion and proliferation of the bile duct endothelial cells on the nanofiber surface were analyzed by calculating the cell adhesion rate and MTT assay, respectively. Cell growth, morphology and distribution on the material surface were observed by fluorescence staining and scanning electron microscopy, respectively. Results After four weeks of directed differentiation of BMSCs in vitro, cells showed the typical morphology of dendritic bile duct endothelial cells and had the expression of CK19. Scanning electron micrographs showed that electrospun materials were continuous nanofibers with diameters between 200 and 500 nm. No significant degradation of the PLGA nanofibers was observed within two weeks. Based on the measured cell adhesion rate, MTT assay, fluorescence staining, and scanning electron microscopy, the differentiated cells possess a good proliferative capacity on PLGA nanofibers. Conclusions BMSCs can be differentiated into the bile duct endothelial cells in vitro. Materials prepared by the electrospinning method have a nanofiber structure, which does not significantly degrade within two weeks. Differentiated cells exhibit good biocompatibility with the nanofibers.
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Zhou J, Chen H, Li S, Xie Y, He W, Nan X, Yue W, Liu B, Pei X. Fibroblastic Potential of CD41+Cells in the Mouse Aorta-Gonad-Mesonephros Region and Yolk Sac. Stem Cells Dev 2012; 21:2592-605. [DOI: 10.1089/scd.2011.0572] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Junnian Zhou
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, China
| | - Haixu Chen
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, China
| | - Siting Li
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, China
| | - Yifan Xie
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, China
- Department of Histology and Embryology, Inner Mongolia Medical College, Inner Mongolia, China
| | - Wenyan He
- Laboratory of Oncology, Affiliated Hospital of Academy of Military Medical Sciences, Beijing, China
| | - Xue Nan
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, China
| | - Wen Yue
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, China
| | - Bing Liu
- Laboratory of Oncology, Affiliated Hospital of Academy of Military Medical Sciences, Beijing, China
| | - Xuetao Pei
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, China
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Effects of Cyclic Uniaxial Stretch on Mammalian Cell Division Direction*. PROG BIOCHEM BIOPHYS 2012. [DOI: 10.3724/sp.j.1206.2011.00210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Jia Y, Yao H, Zhou J, Chen L, Zeng Q, Yuan H, Shi L, Nan X, Wang Y, Yue W, Pei X. Role of epimorphin in bile duct formation of rat liver epithelial stem-like cells: involvement of small G protein RhoA and C/EBPβ. J Cell Physiol 2011; 226:2807-16. [PMID: 21935930 DOI: 10.1002/jcp.22625] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Epimorphin/syntaxin 2 is a high conserved and very abundant protein involved in epithelial morphogenesis in various organs. We have shown recently that epimorphin (EPM), a protein exclusively expressed on the surface of hepatic stellate cells and myofibroblasts of the liver, induces bile duct formation of hepatic stem-like cells (WB-F344 cells) in a putative biophysical way. Therefore, the aim of this study was to present some of the molecular mechanisms by which EPM mediates bile duct formation. We established a biliary differentiation model by co-culture of EPM-overexpressed mesenchymal cells (PT67(EPM)) with WB-F344 cells. Here, we showed that EPM could promote WB-F344 cells differentiation into bile duct-like structures. Biliary differentiation markers were also elevated by EPM including Yp, Cx43, aquaporin-1, CK19, and gamma glutamyl transpeptidase (GGT). Moreover, the signaling pathway of EPM was analyzed by focal adhesion kinase (FAK), extracellular regulated kinase 1/2 (ERK1/2), and RhoA Western blot. Also, a dominant negative (DN) RhoA-WB-F344 cell line (WB(RhoA-DN)) was constructed. We found that the levels of phosphorylation (p) of FAK and ERK1/2 were up-regulated by EPM. Most importantly, we also showed that RhoA is necessary for EPM-induced activation of FAK and ERK1/2 and bile duct formation. In addition, a dual luciferase-reporter assay and CHIP assay was performed to reveal that EPM regulates GGT IV and GGT V expression differentially, possibly mediated by C/EBPβ. Taken together, these data demonstrated that EPM regulates bile duct formation of WB-F344 cells through effects on RhoA and C/EBPβ, implicating a dual aspect of this morphoregulator in bile duct epithelial morphogenesis.
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Affiliation(s)
- Yali Jia
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, China
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Jia YL, Shi L, Zhou JN, Fu CJ, Chen L, Yuan HF, Wang YF, Yan XL, Xu YC, Zeng Q, Yue W, Pei XT. Epimorphin promotes human hepatocellular carcinoma invasion and metastasis through activation of focal adhesion kinase/extracellular signal-regulated kinase/matrix metalloproteinase-9 axis. Hepatology 2011; 54:1808-18. [PMID: 22045676 DOI: 10.1002/hep.24562] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
UNLABELLED The high incidence rate of hepatocellular carcinoma (HCC) is mainly the result of frequent metastasis and tumor recurrence. Unfortunately, the underlying molecular mechanisms driving HCC metastasis are still not fully understood. It has been demonstrated that tumor stroma cells contribute to primary tumor growth and metastasis. Within the HCC environment, activated hepatic stellate cells (HSCs) can release a number of molecules and enhance cancer cell proliferation and invasiveness in a paracrine manner. Here, for the first time, we demonstrate that epimorphin (EPM; also called syntaxin-2), an extracellular protein, is strongly elevated in activated HSCs within tumor stroma. We show that knockdown of EPM expression in HSCs substantially abolishes their effects on cancer cell invasion and metastasis. Ectopic expression of EPM in HCC cancer cells enhances their invasiveness; we demonstrate that the cells expressing EPM have markedly increased metastasis potential. Furthermore, EPM-mediated invasion and metastasis of cancer cells is found to require up-regulation of matrix metalloproteinase-9 (MMP-9) through the activation of focal adhesion kinase (FAK)/extracellular signal-regulated kinase (ERK) axis. CONCLUSION Our results show that EPM, secreted by activated HSCs within HCC stroma, promotes invasion and metastasis of cancer cells by activating MMP-9 expression through the FAK-ERK pathway.
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Affiliation(s)
- Ya-Li Jia
- Stem Cell and Regenerative Medicine Lab, Beijing Institute of Transfusion Medicine, Beijing, China
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Zhao L, Sang C, Yang C, Zhuang F. Effects of stress fiber contractility on uniaxial stretch guiding mitosis orientation and stress fiber alignment. J Biomech 2011; 44:2388-94. [PMID: 21767844 DOI: 10.1016/j.jbiomech.2011.06.033] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2010] [Revised: 06/29/2011] [Accepted: 06/29/2011] [Indexed: 11/28/2022]
Abstract
It has been documented that mitosis orientation (MO) is guided by stress fibers (SFs), which are perpendicular to exogenous cyclic uniaxial stretch. However, the effect of mechanical forces on MO and the mechanism of stretch-induced SFs reorientation are not well elucidated to date. In the present study, we used murine 3T3 fibroblasts as a model, to investigate the effects of uniaxial stretch on SFO and MO utilizing custom-made stretch device. We found that cyclic uniaxial stretch induced both SFs and mitosis directions orienting perpendicularly to the stretch direction. The F-actin and myosin II blockages, which resulted in disoriented SFs and mitosis directions under uniaxial stretch, suggested a high correlation between SFO and MO. Y27632 (10 μM), ML7 (50 μM, or 75 μM), and blebbistatin (50 μM, or 75 μM) treatments resulted in SFO parallel to the principle stretch direction. Upon stimulating and inhibiting the phosphorylation of myosin light chain (p-MLC), we observed a monotonic proportion of SFO to the level of p-MLC. These results suggested that the level of cell contraction is crucial to the response of SFs, either perpendicular or parallel, to the external stretch. Showing the possible role of cell contractility in tuning SFO under external stretch, our experimental data are valuable to understand the predominant factor controlling SFO response to exogenous uniaxial stretch, and thus helpful for improving mechanical models.
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Affiliation(s)
- Lei Zhao
- School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China
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RNAi-mediated Stable Silencing of EPM Expression in Hepatic Stellate Cells Decrease Migration of Hepatocellular Carcinoma*. PROG BIOCHEM BIOPHYS 2011. [DOI: 10.3724/sp.j.1206.2010.00660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Liu XY, Chen XF, Ren YH, Zhan QY, Wang C, Yang C. Alveolar type II cells escape stress failure caused by tonic stretch through transient focal adhesion disassembly. Int J Biol Sci 2011; 7:588-99. [PMID: 21614151 PMCID: PMC3101527 DOI: 10.7150/ijbs.7.588] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2011] [Accepted: 05/07/2011] [Indexed: 01/11/2023] Open
Abstract
Mechanical ventilation-induced excessive stretch of alveoli is reported to induce cellular stress failure and subsequent lung injury, and is therefore an injurious factor to the lung. Avoiding cellular stress failure is crucial to ventilator-induced lung injury (VILI) treatment. In the present study, primary rat alveolar type II (ATII) cells were isolated to evaluate their viability and the mechanism of their survival under tonic stretch. By the annexin V/ PI staining and flow cytometry assay, we demonstrated that tonic stretch-induced cell death is an immediate injury of mechanical stress. In addition, immunofluorescence and immunoblots assay showed that the cells experienced an expansion-contraction-reexpansion process, accompanied by partial focal adhesion (FA) disassembly during contraction. Manipulation of integrin adherent affinity by altering bivalent cation levels in the culture medium and applying an integrin neutralizing antibody showed that facilitated adhesion affinity promoted cell death under tonic stretch, while lower level of adhesion protected the cells from stretch-induced stress failure. Finally, a simplified numerical model was established to reveal that adequate disassembly of FAs reduced the forces transmitting throughout the cell. Taken together, these results indicate that ATII cells escape stress failure caused by tonic stretch via active cell morphological remodeling, during which cells transiently disassemble FAs to unload mechanical forces.
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Affiliation(s)
- Xiao-Yang Liu
- Beijing Chao-Yang Hospital, Capital Medical University, China
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Inamine T, Nakamura M, Kawauchi A, Shirakawa Y, Hashiguchi H, Aiba Y, Taketomi A, Shirabe K, Nakamuta M, Hayashi S, Saoshiro T, Komori A, Yatsuhashi H, Kondo S, Omagari K, Maehara Y, Ishibashi H, Tsukamoto K. A polymorphism in the integrin αV subunit gene affects the progression of primary biliary cirrhosis in Japanese patients. J Gastroenterol 2011; 46:676-86. [PMID: 21116829 DOI: 10.1007/s00535-010-0351-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2010] [Accepted: 11/02/2010] [Indexed: 02/04/2023]
Abstract
BACKGROUND Accumulating evidence indicates that multiple genetic factors are involved in the pathogenesis of primary biliary cirrhosis (PBC). The aim of this study was to investigate whether polymorphisms of the integrin αV subunit gene (ITGAV), a component of integrin αVβ6, which plays an important role in the process of fibrosis, are associated with susceptibility to the onset and/or progression of PBC. METHODS In the primary study, eight tag single nucleotide polymorphisms (SNPs) in ITGAV were analyzed by polymerase chain reaction (PCR)-restriction fragment length polymorphism, direct DNA sequencing, or high-resolution melting curve analysis in 309 Japanese patients with PBC who were registered in the National Hospital Organization Study Group for Liver Disease in Japan (PBC cohort I) and 293 gender-matched healthy Japanese volunteers (control subjects). For the replication study, 35 PBC patients who progressed to end-stage hepatic failure and underwent liver transplantation (PBC cohort II) were also analyzed. RESULTS Three tag SNPs (rs3911238, rs10174098, and rs1448427) in ITGAV were significantly associated with the severe progression of PBC, but not with susceptibility to the onset of PBC, in the primary study (PBC cohort I). Among these SNPs, rs1448427 was also significantly associated with the severe progression to end-stage hepatic failure in the replication study of PBC patients who underwent liver transplantation (PBC cohort II). CONCLUSIONS ITGAV is a genetic determinant for the severe progression of PBC in Japanese patients. Genetic polymorphisms of ITGAV may be useful for identifying high-risk Japanese PBC patients, including those who will require liver transplantation, at the time of initial diagnosis.
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Affiliation(s)
- Tatsuo Inamine
- Department of Pharmacotherapeutics, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
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Lemaigre FP. Molecular mechanisms of biliary development. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2010; 97:103-26. [PMID: 21074731 DOI: 10.1016/b978-0-12-385233-5.00004-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The biliary tree drains the bile produced by hepatocytes to the duodenum via a network of intrahepatic and extrahepatic ducts. In the embryo, the intrahepatic ducts are formed near the branches of the portal vein and derive from the liver precursor cells of the hepatic bud, whereas the extrahepatic ducts directly emerge from the primitive gut. Despite this dual origin, intrahepatic and extrahepatic ducts are lined by a common cell type, the cholangiocyte. In this chapter, we describe how bile ducts are formed and cholangiocytes differentiate, and focus on the regulation of these processes by intercellular signaling pathways and by transcriptional and posttranscriptional mechanisms.
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