1
|
Chang HY, Chang HM, Wu TJ, Chaing CY, Tzai TS, Cheng HL, Raghavaraju G, Chow NH, Liu HS. The role of Lutheran/basal cell adhesion molecule in human bladder carcinogenesis. J Biomed Sci 2017; 24:61. [PMID: 28841878 PMCID: PMC6389174 DOI: 10.1186/s12929-017-0360-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 08/03/2017] [Indexed: 11/25/2022] Open
Abstract
Background Lutheran/basal cell adhesion molecule (Lu/BCAM) is a membrane bound glycoprotein. This study was performed to investigate the role and downstream signaling pathway of Lu/BCAM in human bladder tumorigenesis. Methods Five human bladder cancer (E6, RT4, TSGH8301, TCCSUP and J82), one stable mouse fibroblast cell line (NIH-Lu) expressing Lu/BCAM transgene and sixty human uroepithelial carcinoma specimens were analyzed by real-time PCR, immunohistochemistry (IHC), immunofluorescence (IFA) staining, Western blotting and promoter luciferase assay for Lu/BCAM, respectively. The tumorigenicity of Lu/BCAM was demonstrated by focus formation, colony-forming ability, tumour formation, cell adhesion and migration. Results H-rasV12 was revealed to up-regulate Lu/BCAM at both transcriptional and translation levels. Lu/BCAM expression was detected on the membrane of primary human bladder cancer cells. Over-expression of Lu/BCAM in NIH-Lu stable cells increased focus number, colony formation and cell adhesion accompanied with F-actin rearrangement and decreased cell migration compared with parental NIH3T3 fibroblasts. In the presence of laminin ligand, Lu/BCAM overexpression further suppressed cell migration accompanied with increased cell adhesion. We further revealed that laminin-Lu/BCAM-induced cell adhesion and F-actin rearrangement were through increased Erk phosphorylation with an increase of RhoA and a decrease of Rac1 activity. Similarly, high Lu/BCAM expression was detected in the tumors of human renal pelvis, ureter and bladder, and was significantly associated with advanced tumor stage (p = 0.02). Patients with high Lu/BCAM expression showed a trend toward larger tumor size (p = 0.07) and lower disease-specific survival (p = 0.08), although not reaching statistical significance. Conclusion This is the first report showing that Lu/BCAM, in the presence of its ligand laminin, is oncogenic in human urothelial cancers and may have potential as a novel therapeutic target. Electronic supplementary material The online version of this article (doi:10.1186/s12929-017-0360-x) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Hong-Yi Chang
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China.,Department of Urology, College of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China
| | - Hsin-Mei Chang
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China
| | - Tsung-Jung Wu
- Department of Pathology, College of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China
| | - Chang-Yao Chaing
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China
| | - Tzong-Shin Tzai
- Department of Urology, College of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China
| | - Hong-Lin Cheng
- Department of Urology, College of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China
| | - Giri Raghavaraju
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China
| | - Nan-Haw Chow
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China. .,Department of Pathology, College of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China.
| | - Hsiao-Sheng Liu
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China. .,Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China. .,Center of Infectious Disease and Signaling Research, College of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China.
| |
Collapse
|
2
|
Liu T, Liu S, Zhang K, Chen J, Huang N. Endothelialization of implanted cardiovascular biomaterial surfaces: The development fromin vitrotoin vivo. J Biomed Mater Res A 2013; 102:3754-72. [DOI: 10.1002/jbm.a.35025] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 10/10/2013] [Accepted: 10/18/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Tao Liu
- Key Lab. of Advanced Technology for Materials of Chinese Education Ministry; School of Materials Science and Engineering, Southwest Jiaotong University; Chengdu China
| | - Shihui Liu
- Key Lab. of Advanced Technology for Materials of Chinese Education Ministry; School of Materials Science and Engineering, Southwest Jiaotong University; Chengdu China
- Naton Institute of Medical Technology, Naton Medical Group; Peking China
| | - Kun Zhang
- Key Lab. of Advanced Technology for Materials of Chinese Education Ministry; School of Materials Science and Engineering, Southwest Jiaotong University; Chengdu China
| | - Junying Chen
- Key Lab. of Advanced Technology for Materials of Chinese Education Ministry; School of Materials Science and Engineering, Southwest Jiaotong University; Chengdu China
| | - Nan Huang
- Key Lab. of Advanced Technology for Materials of Chinese Education Ministry; School of Materials Science and Engineering, Southwest Jiaotong University; Chengdu China
| |
Collapse
|
3
|
Mahdi Shariati K, Mohammad Reza N, Mehdi J, Alireza F, Mojtaba S, Bideskan AE. Effects of maternal nicotine exposure on expression of laminin alpha 5 in lung tissue of newborn. Pak J Biol Sci 2013; 15:1168-75. [PMID: 23755407 DOI: 10.3923/pjbs.2012.1168.1175] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Maternal smoking has been clearly demonstrated to be associated with increased health problems in infants and children. Nicotine is the chemical substance with high level of toxicity. It crosses through the placenta and accumulates in the developing organs of fetus. Previous investigation indicated that maternal nicotine exposures induce decreased fibronectin expression in lung parenchyma. In this study, the effect of maternal nicotine exposure on laminin expression of the newborn mice lungs has been evaluated. Female pregnant Balb/C mice were divided randomly in to four groups as fallow: Experimental group 1 (Exp D1); was received 3 mg kg(-1) nicotine intra peritoneal injection (IP) from gestational day 7 (GD7) to the last day of pregnancy, Experimental group 2 (Exp D14); was received 3 mg kg(-1) nicotine from GD7 to postnatal day 14, Groups 3 and 4; as sham control groups (Sha-Con) were received the same volume (3 mg kg(-1)) of normal saline parallel to experimental groups. At the end of exposure times, all of newborns were anesthetized; their lungs were removed and prepared for immunohistochemical method and real-time polymerase chain reaction. The finding indicated that laminin alpha 5 (Lama5) mRNA expressions in the lung of newborn in the nicotine treated Exp D1 decreased by 0.63 fold but increased in Exp D14 by 1.57 fold comparing to Sh-Con groups. Lama5 immunoreactivity was not similar in different parts of the lungs including alveoli and bronchiole, having a significant increase in the experimental groups in contrast to the Sh-Con groups. However, increase in immunoreactivity observed more in Exp D14. Immunoreactivity intensity in small vessels of all experimental groups was not significantly different. These data also indicate that maternal nicotine exposure may induce abnormal laminin expression which may cause defects in lung function during life time.
Collapse
Affiliation(s)
- Kohbanani Mahdi Shariati
- Department of Anatomy and Cell Biology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | | | | | | | | | | |
Collapse
|
4
|
Charwat V, Purtscher M, Tedde SF, Hayden O, Ertl P. Standardization of microfluidic cell cultures using integrated organic photodiodes and electrode arrays. LAB ON A CHIP 2013; 13:785-97. [PMID: 23254868 DOI: 10.1039/c2lc40965h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Nanotechnology provides the tools to develop novel biosensors with improved performance, including sensitivity and response time that can be readily integrated into diagnostic devices. We have developed a miniaturized cell analysis platform to advance microfluidic cell cultures by combining two complementary, label-free and non-invasive cell analysis methods for the long-term monitoring of dynamic cell behavior. The novel dual-parameter cell-on-a-chip detects light scattering from adherent cells to provide information on cell numbers and intracellular granularity, while simultaneously performing impedance spectroscopy to monitor cell adhesion and cell-cell interaction. In the present work we have integrated spray-coated organic photodiode arrays with a lab-on-a-chip containing embedded interdigitated electrode structures to improve assay reproducibility, reliability and accuracy. We successfully demonstrate that the complementary cell chip technology can accurately detect cell numbers, clarify misleading results during cell-substance interaction assays, as well as the cytotoxicity screening of drug substances. The ability to precisely determine cell numbers within minutes constitutes a major step towards standardization.
Collapse
Affiliation(s)
- Verena Charwat
- AIT Austrian Institute of Technology GmbH, Vienna, Austria
| | | | | | | | | |
Collapse
|
5
|
Kuo MW, Wang CH, Wu HC, Chang SJ, Chuang YJ. Soluble THSD7A is an N-glycoprotein that promotes endothelial cell migration and tube formation in angiogenesis. PLoS One 2011; 6:e29000. [PMID: 22194972 PMCID: PMC3237571 DOI: 10.1371/journal.pone.0029000] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2011] [Accepted: 11/18/2011] [Indexed: 12/19/2022] Open
Abstract
Background Thrombospondin type I domain containing 7A (THSD7A) is a novel neural protein that is known to affect endothelial migration and vascular patterning during development. To further understand the role of THSD7A in angiogenesis, we investigated the post-translational modification scheme of THS7DA and to reveal the underlying mechanisms by which this protein regulates blood vessel growth. Methodology/Principal Findings Full-length THSD7A was overexpressed in human embryonic kidney 293T (HEK293T) cells and was found to be membrane associated and N-glycosylated. The soluble form of THSD7A, which is released into the cultured medium, was harvested for further angiogenic assays. We found that soluble THSD7A promotes human umbilical vein endothelial cell (HUVEC) migration and tube formation. HUVEC sprouts and zebrafish subintestinal vessel (SIV) angiogenic assays further revealed that soluble THSD7A increases the number of branching points of new vessels. Interestingly, we found that soluble THSD7A increased the formation of filopodia in HUVEC. The distribution patterns of vinculin and phosphorylated focal adhesion kinase (FAK) were also affected, which implies a role for THSD7A in focal adhesion assembly. Moreover, soluble THSD7A increased FAK phosphorylation in HUVEC, suggesting that THSD7A is involved in regulating cytoskeleton reorganization. Conclusions/Significance Taken together, our results indicate that THSD7A is a membrane-associated N-glycoprotein with a soluble form. Soluble THSD7A promotes endothelial cell migration during angiogenesis via a FAK-dependent mechanism and thus may be a novel neuroangiogenic factor.
Collapse
Affiliation(s)
- Meng-Wei Kuo
- Department of Medical Science and Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
| | - Chian-Huei Wang
- Department of Medical Science and Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
| | - Hsiao-Chun Wu
- Department of Medical Science and Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
| | - Shing-Jyh Chang
- Department of Obstetrics and Gynecology, Hsinchu Mackay Memorial Hospital, Hsinchu, Taiwan, Republic of China
| | - Yung-Jen Chuang
- Department of Medical Science and Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
- * E-mail:
| |
Collapse
|
6
|
Novel role for the Lu/BCAM-spectrin interaction in actin cytoskeleton reorganization. Biochem J 2011; 436:699-708. [PMID: 21434869 DOI: 10.1042/bj20101717] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Lu/BCAM (Lutheran/basal cell-adhesion molecule) is a laminin 511/521 receptor expressed in erythroid and endothelial cells, and in epithelial tissues. The RK573-574 (Arg573-Lys574) motif of the Lu/BCAM cytoplasmic domain interacts with αI-spectrin, the main component of the membrane skeleton in red blood cells. In the present paper we report that Lu/BCAM binds to the non-erythroid αII-spectrin via the RK573-574 motif. Alanine substitution of this motif abolished the Lu/BCAM-spectrin interaction, enhanced the half-life of Lu/BCAM at the MDCK (Madin-Darby canine kidney) cell surface, and increased Lu/BCAM-mediated cell adhesion and spreading on laminin 511/521. We have shown that the Lu/BCAM-spectrin interaction mediated actin reorganization during cell adhesion and spreading on laminin 511/521. This interaction was involved in a laminin 511/521-to-actin signalling pathway leading to stress fibre formation. This skeletal rearrangement was associated with an activation of the small GTP-binding protein RhoA, which depended on the integrity of the Lu/BCAM laminin 511/521-binding site. It also required a Lu/BCAM-αII-spectrin interaction, since its disruption decreased stress fibre formation and RhoA activation. We conclude that the Lu/BCAM-spectrin interaction is required for stress fibre formation during cell spreading on laminin 511/521, and that spectrin acts as a signal relay between laminin 511/521 and actin that is involved in actin dynamics.
Collapse
|
7
|
The relative importance of topography and RGD ligand density for endothelial cell adhesion. PLoS One 2011; 6:e21869. [PMID: 21779342 PMCID: PMC3136933 DOI: 10.1371/journal.pone.0021869] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Accepted: 06/08/2011] [Indexed: 11/21/2022] Open
Abstract
The morphology and function of endothelial cells depends on the physical and chemical characteristics of the extracellular environment. Here, we designed silicon surfaces on which topographical features and surface densities of the integrin binding peptide arginine-glycine-aspartic acid (RGD) could be independently controlled. We used these surfaces to investigate the relative importance of the surface chemistry of ligand presentation versus surface topography in endothelial cell adhesion. We compared cell adhesion, spreading and migration on surfaces with nano- to micro-scaled pyramids and average densities of 6×102–6×1011 RGD/mm2. We found that fewer cells adhered onto rough than flat surfaces and that the optimal average RGD density for cell adhesion was 6×105 RGD/mm2 on flat surfaces and substrata with nano-scaled roughness. Only on surfaces with micro-scaled pyramids did the topography hinder cell migration and a lower average RGD density was optimal for adhesion. In contrast, cell spreading was greatest on surfaces with 6×108 RGD/mm2 irrespectively of presence of feature and their size. In summary, our data suggest that the size of pyramids predominately control the number of endothelial cells that adhere to the substratum but the average RGD density governs the degree of cell spreading and length of focal adhesion within adherent cells. The data points towards a two-step model of cell adhesion: the initial contact of cells with a substratum may be guided by the topography while the engagement of cell surface receptors is predominately controlled by the surface chemistry.
Collapse
|
8
|
Cheng JYC, Raghunath M, Whitelock J, Poole-Warren L. Matrix components and scaffolds for sustained islet function. TISSUE ENGINEERING PART B-REVIEWS 2011; 17:235-47. [PMID: 21476869 DOI: 10.1089/ten.teb.2011.0004] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The clinical treatment of diabetes by islet transplantation is limited by low islet survival rates. A fundamental reason for this inefficiency is likely due to the removal of islets from their native environment. The isolation process not only disrupts interactions between blood vessels and endocrine cells, but also dramatically changes islet cell interaction with the extracellular matrix (ECM). Biomolecular cues from the ECM are important for islet survival, proliferation, and function; however, very little is known about the composition of islet ECM and the role each component plays. Without a thorough understanding of islet ECM, current endeavors to prolong islet survival via scaffold engineering lack a systematic basis. The following article reviews current knowledge of islet ECM and attempts to explain the roles they play in islet function. In addition, the effects of in vitro simulations of the native islet scaffold will be evaluated. Greater understanding in these areas will provide a preliminary platform from which a sustainable bioartificial pancreas may be developed.
Collapse
Affiliation(s)
- Jennifer Y C Cheng
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney, Australia.
| | | | | | | |
Collapse
|
9
|
Benoit YD, Larrivée JF, Groulx JF, Stankova J, Vachon PH, Beaulieu JF. Integrin alpha8beta1 confers anoikis susceptibility to human intestinal epithelial crypt cells. Biochem Biophys Res Commun 2010; 399:434-9. [PMID: 20678483 DOI: 10.1016/j.bbrc.2010.07.107] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2010] [Accepted: 07/27/2010] [Indexed: 01/14/2023]
Abstract
We previously reported that integrin alpha8beta1 is expressed in human intestinal epithelial crypt cells (HIECs) and represents one of the major RGD-binding integrins expressed by these cells. Moreover, the depletion of alpha8beta1 affects vinculin, but not paxillin, localization at focal adhesion points. In the present study, we show that the integrin alpha8 shRNA-mediated knockdown in HIECs leads to a decrease in anoikis susceptibility under cell suspension culture conditions, marked by a reduction in PARP cleavage and propidium iodide incorporation. Moreover, alpha8beta1-depleted HIECs exhibited an illicitly sustained activation of Fak and PI3-K/Akt-1 under anoikis conditions, rendering them refractory to anoikis. To this effect, colon cancer cells exhibiting resistance to anoikis not only displayed a loss of alpha8beta1 expression, but forced expression of alpha8beta1 in these cells decreased their resistance to anoikis. Consequently, alpha8beta1 is a prerequisite for the proper conduct of anoikis in normal HIECs, whereas its loss contributes to the illicit acquisition of anoikis resistance.
Collapse
Affiliation(s)
- Yannick D Benoit
- CIHR Team on Digestive Epithelium, Department of Anatomy and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC, Canada J1H 5N4
| | | | | | | | | | | |
Collapse
|
10
|
Gauthier E, El Nemer W, Wautier MP, Renaud O, Tchernia G, Delaunay J, Le Van Kim C, Colin Y. Role of the interaction between Lu/BCAM and the spectrin-based membrane skeleton in the increased adhesion of hereditary spherocytosis red cells to laminin. Br J Haematol 2010; 148:456-65. [DOI: 10.1111/j.1365-2141.2009.07973.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
11
|
Integrin alpha8beta1 regulates adhesion, migration and proliferation of human intestinal crypt cells via a predominant RhoA/ROCK-dependent mechanism. Biol Cell 2009; 101:695-708. [PMID: 19527220 PMCID: PMC2782361 DOI: 10.1042/bc20090060] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Background. Integrins are transmembrane αβ heterodimer receptors that function as structural and functional bridges between the cytoskeleton and ECM (extracellular matrix) molecules. The RGD (arginine-glycine-aspartate tripeptide motif)-dependent integrin α8β1 has been shown to be involved in various cell functions in neuronal and mesenchymal-derived cell types. Its role in epithelial cells remains unknown. Results. Integrin α8β1 was found to be expressed in the crypt cell population of the human intestine but was absent from differentiating and mature epithelial cells of the villus. The function of α8β1 in epithelial crypt cells was investigated at the cellular level using normal HIECs (human intestinal epithelial cells). Specific knockdown of α8 subunit expression using an shRNA (small-hairpin RNA) approach showed that α8β1 plays important roles in RGD-dependent cell adhesion, migration and proliferation via a RhoA/ROCK (Rho-associated kinase)-dependent mechanism as demonstrated by active RhoA quantification and pharmacological inhibition of ROCK. Moreover, loss of α8β1, through RhoA/ROCK, impairs FA (focal adhesion) complex integrity as demonstrated by faulty vinculin recruitment. Conclusions. Integrin α8β1 is expressed in epithelial cells. In intestinal crypt cells, α8β1 is closely involved in the regulation of adhesion, migration and cell proliferation via a predominant RhoA/ROCK-dependent mechanism. These results suggest an important role for this integrin in intestinal crypt cell homoeostasis.
Collapse
|
12
|
Vuoristo S, Virtanen I, Takkunen M, Palgi J, Kikkawa Y, Rousselle P, Sekiguchi K, Tuuri T, Otonkoski T. Laminin isoforms in human embryonic stem cells: synthesis, receptor usage and growth support. J Cell Mol Med 2008; 13:2622-2633. [PMID: 19397785 DOI: 10.1111/j.1582-4934.2008.00643.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
To reveal the functional intrinsic niche of human embryonic stem cells (hESC) we examined the production of basement membrane (BM) proteins and the presence of their receptors in feeder-free cell culture conditions. In addition, we investigated binding of hESCs to purified human BM proteins and identified the receptors mediating these contacts. Also, we tested whether purified human laminin (Lm) isoforms have a role in hESC self-renewal and growth in short-term cultures. The results show that hESCs synthesize Lm alpha(1) and Lm alpha(5) chains together with Lm beta(1) and gamma(1) chains suggesting the production of Lms-111 and -511 into the culture medium and deposits on cells. hESCs contain functionally important integrin (Int) subunits, Int beta(1), alpha(3), alpha(6), alpha(5), beta(5) and alpha(V), as well as the Lm alpha(5) receptor, Lutheran (Lu) glycoprotein and its truncated form, basal cell adhesion molecule (B-CAM). In cell adhesion experiments, Int beta(1) was crucial for adhesion to most of the purified human BM proteins. Lu/B-CAM mediated adhesion to Lm-511 together with Int alpha(3)beta(1), and was essential for the adhesion of hESCs to embryonic feeder cells. Adhesion to Lm-411 was mediated by Int alpha(6)beta(1). Lm-511 supported hESC growth in defined medium equally well as Matrigel. These results provide consequential information of the biological role of BM in hESCs, warranting further investigation of BM biology of human pluripotent stem cells.
Collapse
Affiliation(s)
- Sanna Vuoristo
- Biomedicum Stem Cell Center, University of Helsinki, Helsinki, Finland.,Hospital for Children and Adolescents, University of Helsinki, Helsinki, Finland
| | - Ismo Virtanen
- Institute of Biomedicine/Anatomy, University of Helsinki, Helsinki, Finland
| | - Minna Takkunen
- Institute of Biomedicine/Anatomy, University of Helsinki, Helsinki, Finland
| | - Jaan Palgi
- Biomedicum Stem Cell Center, University of Helsinki, Helsinki, Finland
| | - Yamato Kikkawa
- Laboratory of Clinical Biochemistry, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
| | - Patricia Rousselle
- Institut de Biologie et Chimie des Protéines, Unité Mixte de Recherche, Institut Fédératif de Recherche BioSciences Lyon-Gerland, Lyon, France
| | - Kiyotoshi Sekiguchi
- Laboratory of Extracellular Matrix Biochemistry, Institute for Protein Research, Osaka University, Suita, Osaka, Japan
| | - Timo Tuuri
- Biomedicum Stem Cell Center, University of Helsinki, Helsinki, Finland
| | - Timo Otonkoski
- Biomedicum Stem Cell Center, University of Helsinki, Helsinki, Finland.,Hospital for Children and Adolescents, University of Helsinki, Helsinki, Finland
| |
Collapse
|
13
|
Virtanen I, Banerjee M, Palgi J, Korsgren O, Lukinius A, Thornell LE, Kikkawa Y, Sekiguchi K, Hukkanen M, Konttinen YT, Otonkoski T. Blood vessels of human islets of Langerhans are surrounded by a double basement membrane. Diabetologia 2008; 51:1181-91. [PMID: 18438639 DOI: 10.1007/s00125-008-0997-9] [Citation(s) in RCA: 119] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2007] [Accepted: 03/11/2008] [Indexed: 12/13/2022]
Abstract
AIMS/HYPOTHESIS Based on mouse study findings, pancreatic islet cells are supposed to lack basement membrane (BM) and interact directly with vascular endothelial BM. Until now, the BM composition of human islets has remained elusive. METHODS Immunohistochemistry with specific monoclonal and polyclonal antibodies as well as electron microscopy were used to study BM organisation and composition in human adult islets. Isolated islet cells and function-blocking monoclonal antibodies and recombinant soluble Lutheran peptide were further used to study islet cell adhesion to laminin (Lm)-511. Short-term cultures of islets were used to study Lutheran and integrin distribution. RESULTS Immunohistochemistry revealed a unique organisation for human Lm-511/521 as a peri-islet BM, which co-invaginated into islets with vessels, forming an outer endocrine BM of the intra-islet vascular channels, and was distinct from the vascular BM that additionally contained Lm-411/421. These findings were verified by electron microscopy. Lutheran glycoprotein, a receptor for the Lm alpha5 chain, was found prominently on endocrine cells, as identified by immunohistochemistry and RT-PCR, whereas alpha(3) and beta(1) integrins were more diffusely distributed. High Lutheran content was also found on endocrine cell membranes in short-term culture of human islets. The adhesion of dispersed beta cells to Lm-511 was inhibited equally effectively by antibodies to integrin and alpha(3) and beta(1) subunits, and by soluble Lutheran peptide. CONCLUSIONS/INTERPRETATION The present results disclose a hitherto unrecognised BM organisation and adhesion mechanisms in human pancreatic islets as distinct from mouse islets.
Collapse
Affiliation(s)
- I Virtanen
- Institute of Biomedicine/Anatomy, University of Helsinki, 00014, Helsinki, Finland.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
El Nemer W, Gauthier E, Wautier MP, Rahuel C, Gane P, Galactéros F, Wautier JL, Cartron JP, Colin Y, Le Van Kim C. Role of Lu/BCAM in abnormal adhesion of sickle red blood cells to vascular endothelium. Transfus Clin Biol 2008; 15:29-33. [PMID: 18514010 DOI: 10.1016/j.tracli.2008.05.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2008] [Accepted: 05/06/2008] [Indexed: 10/22/2022]
Abstract
Lutheran (Lu) blood group and Basal Cell Adhesion Molecule (BCAM) antigens are both carried by two glycoprotein (gp) isoforms of the immunoglobulin superfamily representing receptors for laminin alpha5 chain. They are expressed in red blood cells, in endothelial cells of vascular capillaries and in epithelial cells of several tissues. Lu/BCAM gps are overexpressed in sickle red blood cells (SS RBCs). Stimulation of SS RBCs by epinephrine activates the PKA depending signaling pathway and induces reinforced Lu/BCAM-mediated adhesion to laminin10/11. We have analyzed the phosphorylation state of Lu/BCAM long isoform cytoplasmic tail and showed that it is phosphorylated by CKII, GSK3b and PKA. Phosphorylation of this isoform in transfected K562 cells is stimulated by effectors of the PKA pathway and induces cell adhesion to laminin10/11. Lu/BCAM gps are highly expressed in endothelial cells and exhibit potential integrin binding motifs. We showed that they interact with integrin alpha4beta1, the unique integrin expressed on the surface of young reticulocytes. Adhesion assays under flow conditions showed that SS RBCs adhere to primary human endothelial cells (HUVEC) after selective activation of intergin alpha4beta1 and that this adhesion is mediated by endothelial Lu/BCAM gps. Our studies show that Lu/BCAM gps expressed either on erythroid or on endothelial cells are involved in SS RBC-endothelium interactions and could play a role in the abnormal adhesion of SS RBCs to vascular endothelium contributing to the vaso-occlusive crises reported for sickle cell disease patients.
Collapse
|
15
|
Willberg J, Hormia M, Takkunen M, Kikkawa Y, Sekiguchi K, Virtanen I. Lutheran blood group antigen as a receptor for alpha5 laminins in gingival epithelia. J Periodontol 2007; 78:1810-8. [PMID: 17760553 DOI: 10.1902/jop.2007.060482] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Lutheran blood group glycoprotein (Lu) is a transmembrane receptor of the immunoglobulin superfamily. Lu serves as a receptor for alpha5 laminins (Lm). The Lm alpha5 chain is a constituent of Lms-511 and -521. Lm-511 is found in most human basement membranes (BMs) and also is detected in BM of gingival epithelia. Recent studies indicated that Lu mediates cell adhesion to Lms-511/521 independently or in concert with integrins. This study focused on the expression of Lu in gingival epithelia and on cultured immortalized gingival keratinocytes. The role of Lu and alpha(3) and beta(1) integrin subunits in the adhesion of oral epithelial cells to Lms-511/521 was also studied. METHODS Immunofluorescence microscopy was used to study the expression of Lu in gingival tissues and in cultured gingival keratinocytes. Immunoprecipitation of radioactively metabolically labeled cells was used to detect Lu. Cell adhesion to Lm-511/521 preparation and to pure Lm-511 was studied in quantitative cell adhesion experiments. Morphological adhesion assays were carried out for visualization of the morphology and adhesion structure formation of the adhering cells. RESULTS Immunofluorescence studies on gingiva showed complete coalignment of Lu on basal epithelial cells with the BM Lm alpha5 chain. A surface-confined, punctate immunoreaction for Lu was detected throughout cell surfaces on cultured gingival cells. Immunoprecipitation showed a broad polypeptide with molecular weight 85,000. In quantitative cell adhesion assays, the adhesion of cells to both Lm alpha5 preparations was diminished with monoclonal antibodies (MAbs) against integrin alpha(3) and even more effectively with MAbs against the beta(1) subunit. When the adhesion sites were blocked with soluble recombinant Lu (sol-Lu), the adhesion of gingival epithelial cells to Lms-511/521 was reduced significantly, and sol-Lu increased the inhibition with integrin alpha(3) antibody. Lm-511 did not induce lamellipodia or focal contacts in cultured gingival keratinocytes. CONCLUSIONS Lu was in coalignment with Lm alpha5 chain in gingival epithelia. Lu also seemed to have a role in gingival epithelial cell adhesion together with integrin alpha(3)beta(1).
Collapse
Affiliation(s)
- Jaana Willberg
- Department of Oral Pathology and Radiology, Institute of Dentistry, University of Turku, Turku, Finland.
| | | | | | | | | | | |
Collapse
|
16
|
Teller IC, Auclair J, Herring E, Gauthier R, Ménard D, Beaulieu JF. Laminins in the developing and adult human small intestine: relation with the functional absorptive unit. Dev Dyn 2007; 236:1980-90. [PMID: 17503455 DOI: 10.1002/dvdy.21186] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The expression of the five laminin alpha-chains was analyzed in the developing and mature human small intestine at the protein and transcript levels in order to further delineate specific involvement of individual laminins in relation to the epithelial cell state as defined along the functional crypt-villus axis. The results show that all of the alpha-laminin transcripts are expressed in significant amounts in the small intestine relative to a panel of other tissues and organs. Further analysis of their expression by indirect immunofluorescence and semi-quantitative and quantitative RT-PCR demonstrates a close correlation between transcript and protein expression, distinct epithelial and mesenchymal origins, as well as differential occurrence in intestinal basement membranes according to developmental stage, along the crypt-villus axis and in compartment-related experimental intestinal cell models. Taken together, the data point out the prime importance of alpha2-, alpha3-, and alpha5-containing laminins for the development and maintenance of the functional human intestinal epithelium.
Collapse
Affiliation(s)
- Inga C Teller
- CIHR Team on Digestive Epithelium, Département d'anatomie et de biologie cellulaire, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, Québec, Canada
| | | | | | | | | | | |
Collapse
|
17
|
Wautier MP, El Nemer W, Gane P, Rain JD, Cartron JP, Colin Y, Le Van Kim C, Wautier JL. Increased adhesion to endothelial cells of erythrocytes from patients with polycythemia vera is mediated by laminin alpha5 chain and Lu/BCAM. Blood 2007; 110:894-901. [PMID: 17412890 DOI: 10.1182/blood-2006-10-048298] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Patients with polycythemia vera (PV) have a JAK2 (a cytosolic tyrosine kinase) mutation and an increased risk of vascular thrombosis related to red blood cell (RBC) mass and platelet activation. We investigated functional RBC abnormalities that could be involved in thrombosis. RBC adhesion to human umbilical vein endothelial cells (HUVECs) was measured by a radiometric technique and in a flow system by video microscopy, and adhesion molecule expression was determined using specific antibodies (against CD36, CD49d, ICAM-4, Lu/BCAM, CD147, and CD47) and flow cytometry in a group of 38 patients with PV and a group of 36 healthy volunteers. Adhesion of PV RBCs was 3.7-fold higher than that of normal RBCs (P < .001). Adhesion was inhibited when PV RBCs were incubated with anti-Lutheran blood group/basal cell adhesion molecule (Lu/BCAM) or when HUVECs were treated with anti-laminin alpha(5) and to a lesser extent with anti-alpha(3) integrin. Lu/BCAM was constitutively phosphorylated in PV RBCs. Transfection of K562 cells with JAK2 617V>F resulted in increased expression and phosphorylation of Lu/BCAM. Phosphorylation of Lu/BCAM increases RBC adhesion. Our results indicate that JAK2 mutation might be linked to Lu/BCAM modification and increased RBC adhesiveness, which may be a factor favoring thrombosis in PV.
Collapse
|
18
|
Rebustini IT, Patel VN, Stewart JS, Layvey A, Georges-Labouesse E, Miner JH, Hoffman MP. Laminin alpha5 is necessary for submandibular gland epithelial morphogenesis and influences FGFR expression through beta1 integrin signaling. Dev Biol 2007; 308:15-29. [PMID: 17601529 PMCID: PMC2097956 DOI: 10.1016/j.ydbio.2007.04.031] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2007] [Revised: 04/20/2007] [Accepted: 04/25/2007] [Indexed: 01/25/2023]
Abstract
Laminin alpha chains have unique spatiotemporal expression patterns during development and defining their function is necessary to understand the regulation of epithelial morphogenesis. We investigated the function of laminin alpha5 in mouse submandibular glands (SMGs). Lama5(-/-) SMGs have a striking phenotype: epithelial clefting is delayed, although proliferation occurs; there is decreased FGFR1b and FGFR2b, but no difference in Lama1 expression; later in development, epithelial cell organization and lumen formation are disrupted. In wild-type SMGs alpha5 and alpha1 are present in epithelial clefts but as branching begins alpha5 expression increases while alpha1 decreases. Lama5 siRNA decreased branching, p42 MAPK phosphorylation, and FGFR expression, and branching was rescued by FGF10. FGFR siRNA decreased Lama5 suggesting that FGFR signaling provides positive feedback for Lama5 expression. Anti-beta1 integrin antibodies decreased FGFR and Lama5 expression, suggesting that beta1 integrin signaling provides positive feedback for Lama5 and FGFR expression. Interestingly, the Itga3(-/-):Itga6(-/-) SMGs have a similar phenotype to Lama5(-/-). Our findings suggest that laminin alpha5 controls SMG epithelial morphogenesis through beta1 integrin signaling by regulating FGFR expression, which also reciprocally regulates the expression of Lama5. These data link changes in basement membrane composition during branching morphogenesis with FGFR expression and signaling.
Collapse
MESH Headings
- Animals
- Cell Proliferation
- Epithelium/embryology
- Feedback
- Fibroblast Growth Factor 1/genetics
- Gene Expression Regulation, Developmental
- Gestational Age
- Integrin alpha3/genetics
- Integrin alpha3/physiology
- Integrin alpha6/genetics
- Integrin alpha6/physiology
- Integrin beta1/physiology
- Laminin/deficiency
- Laminin/genetics
- Laminin/physiology
- Mice
- Mice, Knockout
- Models, Biological
- Morphogenesis
- Phenotype
- RNA, Small Interfering/genetics
- Receptor, Fibroblast Growth Factor, Type 1/genetics
- Receptor, Fibroblast Growth Factor, Type 2/genetics
- Receptors, Fibroblast Growth Factor/antagonists & inhibitors
- Receptors, Fibroblast Growth Factor/genetics
- Signal Transduction
- Submandibular Gland/embryology
- Submandibular Gland/physiology
Collapse
Affiliation(s)
- Ivan T Rebustini
- Matrix and Morphogenesis Unit, Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892-4370, USA
| | | | | | | | | | | | | |
Collapse
|
19
|
Kikkawa Y, Sasaki T, Nguyen MT, Nomizu M, Mitaka T, Miner JH. The LG1-3 tandem of laminin alpha5 harbors the binding sites of Lutheran/basal cell adhesion molecule and alpha3beta1/alpha6beta1 integrins. J Biol Chem 2007; 282:14853-60. [PMID: 17383963 DOI: 10.1074/jbc.m611706200] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The laminin-type globular (LG) domains of laminin alpha chains have been implicated in various cellular interactions that are mediated through receptors such as integrins, alpha-dystroglycan, syndecans, and the Lutheran blood group glycoprotein (Lu). Lu, an Ig superfamily transmembrane receptor specific for laminin alpha5, is also known as basal cell adhesion molecule (B-CAM). Although Lu/B-CAM binds to the LG domain of laminin alpha5, the binding site has not been precisely defined. To better delineate this binding site, we produced a series of recombinant laminin trimers containing modified alpha chains, such that all or part of alpha5LG was replaced with analogous segments of human laminin alpha1LG. In solid phase binding assays using a soluble Lu (Lu-Fc) composed of the Lu extracellular domain and human IgG1 Fc, we found that Lu bound to Mr5G3, a recombinant laminin containing alpha5 domains LN through LG3 fused to human laminin alpha1LG4-5. However, Lu/B-CAM did not bind other recombinant laminins containing alpha5LG3 unless alpha5LG1-2 was also present. A recombinant alpha5LG1-3 tandem lacking the laminin coiled coil (LCC) domain did not reproduce the activity of Lu/B-CAM binding. Therefore, proper structure of the alpha5LG1-3 tandem with the LCC domain was essential for the binding of Lu/B-CAM to laminin alpha5. Our results also suggest that the binding site for Lu/B-CAM on laminin alpha5 may overlap with that of integrins alpha3beta1 and alpha6beta1.
Collapse
Affiliation(s)
- Yamato Kikkawa
- Renal Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
| | | | | | | | | | | |
Collapse
|
20
|
Collec E, El nemer W, Gauthier E, Gane P, Lecomte MC, Dhermy D, Cartron J, Colin Y, Le van kim C, Rahuel C. Ubc9 interacts with Lu/BCAM adhesion glycoproteins and regulates their stability at the membrane of polarized MDCK cells. Biochem J 2007; 402:311-9. [PMID: 17087659 PMCID: PMC1798433 DOI: 10.1042/bj20060861] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Lu (Lutheran) blood group and BCAM (basal cell adhesion molecule) antigens both reside on two gp (glycoprotein) isoforms, Lu and Lu(v13), that differ by the size of their cytoplasmic tail. They are receptors of laminin-10/11 and are expressed in RBCs (red blood cells), epithelial cells of multiple tissues and vascular endothelial cells. To gain more insights into the biological function of Lu/BCAM gps, we looked for potential partners of their cytoplasmic tail. We isolated Ubc9 (ubiquitin-conjugating enzyme 9) protein by screening a human kidney library using the yeast two-hybrid system. Lu/Ubc9 interaction was validated by GST (glutathione S-transferase) pull-down and co-immunoprecipitation experiments. Endogenous Ubc9 formed a complex with endogenous or recombinant Lu gp in A498 and MDCK (Madin-Darby canine kidney) epithelial cells respectively. Replacement of Lys(585) by alanine in the Lu gp abolished in vitro and ex vivo interactions of Lu gp with Ubc9 protein. Lu K585A mutant transfected in MDCK cells exhibited a normal basolateral membrane expression but was overexpressed at the surface of polarized MDCK cells as compared with wild-type Lu. Pulse-chase experiments showed extended half-life of Lu K585A gp at the plasma membrane, suggesting an impaired endocytosis of this mutant leading to protein accumulation at the membrane. Furthermore, we showed that the ability of MDCK-Lu K585A cells to spread on immobilized laminin was dramatically decreased. Our results support a physiological role for the direct interaction between Lu gp and Ubc9 protein and reveal a role for this enzyme in regulating the stability of Lu gp at the cell membrane.
Collapse
Affiliation(s)
- Emmanuel Collec
- Inserm, U665, Paris F-75015, France, Institut National de la Transfusion Sanguine, Paris F-75015, France, and Université Paris 7/Denis Diderot, Paris F-75005, France
| | - Wassim El nemer
- Inserm, U665, Paris F-75015, France, Institut National de la Transfusion Sanguine, Paris F-75015, France, and Université Paris 7/Denis Diderot, Paris F-75005, France
| | - Emilie Gauthier
- Inserm, U665, Paris F-75015, France, Institut National de la Transfusion Sanguine, Paris F-75015, France, and Université Paris 7/Denis Diderot, Paris F-75005, France
| | - Pierre Gane
- Inserm, U665, Paris F-75015, France, Institut National de la Transfusion Sanguine, Paris F-75015, France, and Université Paris 7/Denis Diderot, Paris F-75005, France
| | - Marie-Christine Lecomte
- Inserm, U665, Paris F-75015, France, Institut National de la Transfusion Sanguine, Paris F-75015, France, and Université Paris 7/Denis Diderot, Paris F-75005, France
| | - Didier Dhermy
- Inserm, U665, Paris F-75015, France, Institut National de la Transfusion Sanguine, Paris F-75015, France, and Université Paris 7/Denis Diderot, Paris F-75005, France
| | - Jean Pierre Cartron
- Inserm, U665, Paris F-75015, France, Institut National de la Transfusion Sanguine, Paris F-75015, France, and Université Paris 7/Denis Diderot, Paris F-75005, France
| | - Yves Colin
- Inserm, U665, Paris F-75015, France, Institut National de la Transfusion Sanguine, Paris F-75015, France, and Université Paris 7/Denis Diderot, Paris F-75005, France
| | - Caroline Le van kim
- Inserm, U665, Paris F-75015, France, Institut National de la Transfusion Sanguine, Paris F-75015, France, and Université Paris 7/Denis Diderot, Paris F-75005, France
- To whom correspondence should be addressed (email )
| | - Cécile Rahuel
- Inserm, U665, Paris F-75015, France, Institut National de la Transfusion Sanguine, Paris F-75015, France, and Université Paris 7/Denis Diderot, Paris F-75005, France
| |
Collapse
|
21
|
Vainionpää N, Bützow R, Hukkanen M, Jackson DG, Pihlajaniemi T, Sakai LY, Virtanen I. Basement membrane protein distribution in LYVE-1-immunoreactive lymphatic vessels of normal tissues and ovarian carcinomas. Cell Tissue Res 2007; 328:317-28. [PMID: 17265066 DOI: 10.1007/s00441-006-0366-2] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2006] [Accepted: 12/05/2006] [Indexed: 12/16/2022]
Abstract
The endothelial cells of blood vessels assemble basement membranes that play a role in vessel formation, maintenance and function, and in the migration of inflammatory cells. However, little is known about the distribution of basement membrane constituents in lymphatic vessels. We studied the distribution of basement membrane proteins in lymphatic vessels of normal human skin, digestive tract, ovary and, as an example of tumours with abundant lymphatics, ovarian carcinomas. Basement membrane proteins were localized by immunohistochemistry with monoclonal antibodies, whereas lymphatic capillaries were detected with antibodies to the lymphatic vessel endothelial hyaluronan receptor-1, LYVE-1. In skin and ovary, fibrillar immunoreactivity for the laminin alpha4, beta1, beta2 and gamma1 chains, type IV and XVIII collagens and nidogen-1 was found in the basement membrane region of the lymphatic endothelium, whereas also heterogeneous reactivity for the laminin alpha5 chain was detected in the digestive tract. Among ovarian carcinomas, intratumoural lymphatic vessels were found especially in endometrioid carcinomas. In addition to the laminin alpha4, beta1, beta2 and gamma1 chains, type IV and XVIII collagens and nidogen-1, carcinoma lymphatics showed immunoreactivity for the laminin alpha5 chain and Lutheran glycoprotein, a receptor for the laminin alpha5 chain. In normal lymphatic capillaries, the presence of primarily alpha4 chain laminins may therefore compromise the formation of endothelial basement membrane, as these truncated laminins lack one of the three arms required for efficient network assembly. The localization of basement membrane proteins adjacent to lymphatic endothelia suggests a role for these proteins in lymphatic vessels. The distribution of the laminin alpha5 chain and Lutheran glycoprotein proposes a difference between normal and carcinoma lymphatic capillaries.
Collapse
Affiliation(s)
- Noora Vainionpää
- Institute of Biomedicine/Anatomy, University of Helsinki, Haartmaninkatu 8, FI-00014, Helsinki, Finland.
| | | | | | | | | | | | | |
Collapse
|
22
|
El Nemer W, Wautier MP, Rahuel C, Gane P, Hermand P, Galactéros F, Wautier JL, Cartron JP, Colin Y, Le Van Kim C. Endothelial Lu/BCAM glycoproteins are novel ligands for red blood cell alpha4beta1 integrin: role in adhesion of sickle red blood cells to endothelial cells. Blood 2006; 109:3544-51. [PMID: 17158232 DOI: 10.1182/blood-2006-07-035139] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The Lutheran (Lu) blood group and basal cell adhesion molecule (BCAM) antigens are both carried by 2 glycoprotein isoforms of the immunoglobulin superfamily representing receptors for the laminin alpha(5) chain. In addition to red blood cells, Lu/BCAM proteins are highly expressed in endothelial cells. Abnormal adhesion of red blood cells to the endothelium could potentially contribute to the vaso-occlusive episodes in sickle cell disease. Considering the presence of integrin consensus-binding sites in Lu/BCAM proteins, we investigated their potential interaction with integrin alpha(4)beta(1), the unique integrin expressed on immature circulating sickle red cells. Using cell adhesion assays under static and flow conditions, we demonstrated that integrin alpha(4)beta(1) expressed on transfected cells bound to chimeric Lu-Fc protein. We showed that epinephrine-stimulated sickle cells, but not control red cells, adhered to Lu-Fc via integrin alpha(4)beta(1) under flow conditions. Antibody-mediated activation of integrin alpha(4)beta(1) induced adhesion of sickle red cells to primary human umbilical vein endothelial cells; this adhesion was inhibited by soluble Lu-Fc and vascular cell adhesion molecule-1 (VCAM-1)-Fc proteins. This novel interaction between integrin alpha(4)beta(1) in sickle red cells and endothelial Lu/BCAM proteins could participate in sickle cell adhesion to endothelium and potentially play a role in vaso-occlusive episodes.
Collapse
|