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Sivakumar S, Lieber S, Librizzi D, Keber C, Sommerfeld L, Finkernagel F, Roth K, Reinartz S, Bartsch JW, Graumann J, Müller‐Brüsselbach S, Müller R. Basal cell adhesion molecule promotes metastasis-associated processes in ovarian cancer. Clin Transl Med 2023; 13:e1176. [PMID: 36647260 PMCID: PMC9842900 DOI: 10.1002/ctm2.1176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 12/29/2022] [Accepted: 01/03/2023] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Basal cell adhesion molecule (BCAM) is a laminin α5 (LAMA5) binding membrane-bound protein with a putative role in cancer. Besides full-length BCAM1, an isoform lacking most of the cytoplasmic domain (BCAM2), and a soluble form (sBCAM) of unknown function are known. In ovarian carcinoma (OC), all BCAM forms are abundant and associated with poor survival, yet BCAM's contribution to peritoneal metastatic spread remains enigmatic. METHODS Biochemical, omics-based and real-time cell assays were employed to identify the source of sBCAM and metastasis-related functions of different BCAM forms. OC cells, explanted omentum and a mouse model of peritoneal colonisation were used in loss- and gain-of-function experiments. RESULTS We identified ADAM10 as a major BCAM sheddase produced by OC cells and identified proteolytic cleavage sites proximal to the transmembrane domain. Recombinant soluble BCAM inhibited single-cell adhesion and migration identically to membrane-bound isoforms, confirming its biological activity in OC. Intriguingly, this seemingly anti-tumorigenic potential of BCAM contrasts with a novel pro-metastatic function discovered in the present study. Thus, all queried BCAM forms decreased the compactness of tumour cell spheroids by inhibiting LAMA5 - integrin β1 interactions, promoted spheroid dispersion in a three-dimensional collagen matrix, induced clearance of mesothelial cells at spheroid attachment sites in vitro and enhanced invasion of spheroids into omental tissue both ex vivo and in vivo. CONCLUSIONS Membrane-bound BCAM as well as sBCAM shed by ADAM10 act as decoys rather than signalling receptors to modulate metastasis-related functions. While BCAM appears to have tumour-suppressive effects on single cells, it promotes the dispersion of OC cell spheroids by regulating LAMA5-integrin-β1-dependent compaction and thereby facilitating invasion of metastatic target sites. As peritoneal dissemination is majorly mediated by spheroids, these findings offer an explanation for the association of BCAM with a poor clinical outcome of OC, suggesting novel therapeutic options.
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Affiliation(s)
- Suresh Sivakumar
- Department of Translational OncologyCenter for Tumor Biology and Immunology (ZTI)Philipps UniversityMarburgGermany
| | - Sonja Lieber
- Department of Translational OncologyCenter for Tumor Biology and Immunology (ZTI)Philipps UniversityMarburgGermany
| | - Damiano Librizzi
- Small Animal Imaging Core FacilityCenter for Tumor Biology and Immunology (ZTI)Philipps UniversityMarburgGermany
| | - Corinna Keber
- Institute for PathologyPhilipps UniversityMarburgGermany
| | - Leah Sommerfeld
- Department of Translational OncologyCenter for Tumor Biology and Immunology (ZTI)Philipps UniversityMarburgGermany
| | - Florian Finkernagel
- Department of Translational OncologyCenter for Tumor Biology and Immunology (ZTI)Philipps UniversityMarburgGermany
- Bioinformatics Core FacilityCenter for Tumor Biology and Immunology (ZTI)Philipps UniversityMarburgGermany
| | - Katrin Roth
- Cell Imaging Core FacilityCenter for Tumor Biology and Immunology (ZTI)Philipps UniversityMarburgGermany
| | - Silke Reinartz
- Department of Translational OncologyCenter for Tumor Biology and Immunology (ZTI)Philipps UniversityMarburgGermany
| | | | - Johannes Graumann
- Biomolecular Mass SpectrometryMax Planck Institute for Heart and Lung ResearchBad NauheimGermany
- Institute for Translational ProteomicsPhilipps UniversityMarburgGermany
| | - Sabine Müller‐Brüsselbach
- Department of Translational OncologyCenter for Tumor Biology and Immunology (ZTI)Philipps UniversityMarburgGermany
| | - Rolf Müller
- Department of Translational OncologyCenter for Tumor Biology and Immunology (ZTI)Philipps UniversityMarburgGermany
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Zhao J, Liang J, Yang Y, Sun G, Zhang X, Zhao J, Hu X, Chen J, Zhu S, Ni Y, Zhang Y, Dai J, Wang Z, Wang Z, Zeng Y, Yao J, Chen N, Shen P, Liu Z, Zeng H. Integrated multi-omics analyses reveal that BCAM is associated with epigenetic modification and tumor microenvironment subtypes of clear cell renal cell carcinoma. Clin Epigenetics 2022; 14:99. [PMID: 35941663 PMCID: PMC9361577 DOI: 10.1186/s13148-022-01319-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 08/03/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Clear cell renal cell carcinoma (ccRCC) is the most common and highly heterogeneous subtype of renal cell carcinoma. Dysregulated basal cell adhesion molecule (BCAM) gene is associated with poor prognosis in various cancers. However, the dysregulated functions and related multi-omics features of BCAM in ccRCC stay unclear. RESULTS BCAM expression was aberrantly downregulated in ccRCC and correlated with adverse pathological parameters and poor prognosis. Low mRNA expression of BCAM was remarkably associated with its CpG methylation levels and BAP1 mutation status. Patients with lower-expressed BCAM concomitant with BAP1 mutation had a worse prognosis. Using RNA-seq data from The cancer genome atlas, we found that compared to the BCAM-high expression subgroup, ccRCC patients in the BCAM-low expression subgroup had significantly higher levels of immune infiltration, higher immune checkpoint expression levels and lower TIDE (tumor immune dysfunction and exclusion) score, indicating potential better response to immunotherapy. Data from the Clinical Proteomic Tumor Analysis Consortium further validated the association between low BCAM expression and CD8 + inflamed phenotype at protein level. Meanwhile, our results suggested that the angiogenesis-related pathways were enriched in the BCAM-high expression subgroup. More importantly, according to the data from the GDSC database, we revealed that the BCAM-high expression subgroup should be more sensitive to anti-angiogenetic therapies, including sorafenib, pazopanib and axitinib. CONCLUSIONS These results suggest that BCAM could serve as a biomarker distinguishing different tumor microenvironment phenotypes, predicting prognosis and helping therapeutic decision-making for patients with ccRCC.
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Affiliation(s)
- Junjie Zhao
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Jiayu Liang
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Yang Yang
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Guangxi Sun
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Xingming Zhang
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Jinge Zhao
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Xu Hu
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Junru Chen
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Sha Zhu
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Yuchao Ni
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Yaowen Zhang
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Jindong Dai
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Zhipeng Wang
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Zilin Wang
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Yuhao Zeng
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Jin Yao
- Department of Radiology, West China Hospital, Sichuan University, Chengdu, 610041, People's Republic of China
| | - Ni Chen
- Department of Pathology, West China Hospital, Sichuan University, Chengdu, 610041, People's Republic of China
| | - Pengfei Shen
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China
| | - Zhenhua Liu
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China.
| | - Hao Zeng
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, No.37 Guoxue Alley, Wuhou District, Chengdu City, 610041, Sichuan Province, People's Republic of China.
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Shannon MJ, Baltayeva J, Castellana B, Wächter J, McNeill GL, Yoon JS, Treissman J, Le HT, Lavoie PM, Beristain AG. Cell trajectory modeling identifies a primitive trophoblast state defined by BCAM enrichment. Development 2022; 149:273982. [PMID: 35020896 DOI: 10.1242/dev.199840] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 12/07/2021] [Indexed: 12/14/2022]
Abstract
In early placental development, progenitor cytotrophoblasts (CTB) differentiate along one of two cellular trajectories: the villous or extravillous pathways. CTB committed to the villous pathway fuse with neighboring CTB to form the outer multinucleated syncytiotrophoblast (SCT), whereas CTB committed to the extravillous pathway differentiate into invasive extravillous trophoblasts (EVT). Unfortunately, little is known about the processes controlling human CTB progenitor maintenance and differentiation. To address this, we established a single cell RNA sequencing (scRNA-seq) dataset from first trimester placentas to identify cell states important in trophoblast progenitor establishment, renewal and differentiation. Multiple distinct trophoblast states were identified, representing progenitor CTB, column CTB, SCT precursors and EVT. Lineage trajectory analysis identified a progenitor origin that was reproduced in human trophoblast stem cell organoids. Heightened expression of basal cell adhesion molecule (BCAM) defined this primitive state, where BCAM enrichment or gene silencing resulted in enhanced or diminished organoid growth, respectively. Together, this work describes at high-resolution trophoblast heterogeneity within the first trimester, resolves gene networks within human CTB progenitors and identifies BCAM as a primitive progenitor marker and possible regulator.
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Affiliation(s)
- Matthew J Shannon
- The British Columbia Children's Hospital Research Institute, Vancouver V5Z 4H4, Canada.,Department of Obstetrics & Gynecology, The University of British Columbia, Vancouver V6Z 2K8, Canada
| | - Jennet Baltayeva
- The British Columbia Children's Hospital Research Institute, Vancouver V5Z 4H4, Canada.,Department of Obstetrics & Gynecology, The University of British Columbia, Vancouver V6Z 2K8, Canada
| | - Barbara Castellana
- The British Columbia Children's Hospital Research Institute, Vancouver V5Z 4H4, Canada.,Department of Obstetrics & Gynecology, The University of British Columbia, Vancouver V6Z 2K8, Canada
| | - Jasmin Wächter
- The British Columbia Children's Hospital Research Institute, Vancouver V5Z 4H4, Canada.,Department of Obstetrics & Gynecology, The University of British Columbia, Vancouver V6Z 2K8, Canada
| | - Gina L McNeill
- The British Columbia Children's Hospital Research Institute, Vancouver V5Z 4H4, Canada.,Department of Obstetrics & Gynecology, The University of British Columbia, Vancouver V6Z 2K8, Canada
| | - Ji Soo Yoon
- The British Columbia Children's Hospital Research Institute, Vancouver V5Z 4H4, Canada.,Department of Surgery, The University of British Columbia, Vancouver V5Z 1M9, Canada
| | - Jenna Treissman
- The British Columbia Children's Hospital Research Institute, Vancouver V5Z 4H4, Canada.,Department of Obstetrics & Gynecology, The University of British Columbia, Vancouver V6Z 2K8, Canada
| | - Hoa T Le
- The British Columbia Children's Hospital Research Institute, Vancouver V5Z 4H4, Canada.,Department of Obstetrics & Gynecology, The University of British Columbia, Vancouver V6Z 2K8, Canada
| | - Pascal M Lavoie
- The British Columbia Children's Hospital Research Institute, Vancouver V5Z 4H4, Canada.,Department of Pediatrics, The University of British Columbia, Vancouver V6H 3V4, Canada
| | - Alexander G Beristain
- The British Columbia Children's Hospital Research Institute, Vancouver V5Z 4H4, Canada.,Department of Obstetrics & Gynecology, The University of British Columbia, Vancouver V6Z 2K8, Canada
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Abstract
Identification of novel therapeutic targets has improved diagnostics and treatment of many diseases. Many innovative treatment strategies have been developed based on the newly identified biomarkers and key molecules. Most of the research focused on ways to manipulate signaling pathways by activating or suppressing them, validate new therapeutic targets for treatment, and epigenetic treatment of diseases. With the identification of aberrations in multiple growth pathways, the focus then shifted to the small molecules involved in these pathways for targeted therapy. In this communication/short review, we highlight the importance of identification of abnormal activation of the mitogen-activated protein kinase (MAPK), ERK1/2, and its upstream mediator MEK1/2, in erythrocytes in patients with sickle cell disease (SCD) critical for the adhesive interactions of these cells with the endothelium, and leukocytes promoting circulatory obstruction leading to tissue ischemia and infraction. We also discuss how targeting this signaling cascade with MEK1/2 inhibitors can reverse acute vasoocclusive crises in SCD.
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Affiliation(s)
- Rahima Zennadi
- Division of Hematology and Duke Comprehensive Sickle Cell Center, Department of Medicine, Duke University Medical Center, North Carolina, USA
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Kucukal E, Little JA, Gurkan UA. Shear dependent red blood cell adhesion in microscale flow. Integr Biol (Camb) 2019; 10:194-206. [PMID: 29557482 DOI: 10.1039/c8ib00004b] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Non-adherence and deformability are the key intrinsic biomechanical features of the red blood cell (RBC), which allow it to tightly squeeze and pass through even the narrowest of microcirculatory networks. Blockage of microcirculatory flow, also known as vaso-occlusion, is a consequence of abnormal cellular adhesion to the vascular endothelium. In sickle cell disease (SCD), an inherited anaemia, even though RBCs have been shown to be heterogeneous in adhesiveness and deformability, this has not been studied in the context of physiologically relevant dynamic shear gradients at the microscale. We developed a microfluidic system that simulates physiologically relevant shear gradients of microcirculatory blood flow at a constant single volumetric flow rate. Using this system, shear dependent adhesion of RBCs from 28 subjects with SCD and from 11 healthy subjects was investigated using vascular endothelial protein functionalized microchannels. We defined a new term, RBC Shear Gradient Microfluidic Adhesion (SiGMA) index to assess shear dependent RBC adhesion in a subject-specific manner. We have shown for the first time that shear dependent adhesion of RBCs is heterogeneous in a microfluidic flow model, which correlates clinically with inflammatory markers and iron overload in subjects with SCD. This study reveals the complex dynamic interactions between RBC-mediated microcirculatory occlusion and clinical outcomes in SCD. These interactions may also be relevant to other microcirculatory disorders and microvascular diseases.
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Affiliation(s)
- Erdem Kucukal
- Department of Mechanical and Aerospace Engineering, Case Biomanufacturing and Microfabrication Laboratory, Case Western Reserve University, Glennan 616B, 10900 Euclid Ave., Cleveland, OH, USA.
| | - Jane A Little
- Department of Hematology and Oncology, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA and Seidman Cancer Center at University Hospitals, Case Medical Center, Cleveland, OH, USA
| | - Umut A Gurkan
- Department of Mechanical and Aerospace Engineering, Case Biomanufacturing and Microfabrication Laboratory, Case Western Reserve University, Glennan 616B, 10900 Euclid Ave., Cleveland, OH, USA. and Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, USA and Department of Orthopaedics, Case Western Reserve University, Cleveland, OH 44106, USA
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Glycophorin-C sialylation regulates Lu/BCAM adhesive capacity during erythrocyte aging. Blood Adv 2018; 2:14-24. [PMID: 29344581 DOI: 10.1182/bloodadvances.2017013094] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Accepted: 11/30/2017] [Indexed: 11/20/2022] Open
Abstract
Lutheran/basal cell adhesion molecule (Lu/BCAM) is a transmembrane adhesion molecule expressed by erythrocytes and endothelial cells that can interact with the extracellular matrix protein laminin-α5. In sickle cell disease, Lu/BCAM is thought to contribute to adhesion of sickle erythrocytes to the vascular wall, especially during vaso-occlusive crises. On healthy erythrocytes however, its function is unclear. Here we report that Lu/BCAM is activated during erythrocyte aging. We show that Lu/BCAM-mediated binding to laminin-α5 is restricted by interacting, in cis, with glycophorin-C-derived sialic acid residues. Following loss of sialic acid during erythrocyte aging, Lu/BCAM is released from glycophorin-C and allowed to interact with sialic acid residues on laminin-α5. Decreased glycophorin-C sialylation, as observed in individuals lacking exon 3 of glycophorin-C, the so-called Gerbich phenotype, was found to correlate with increased Lu/BCAM-dependent binding to laminin-α5. In addition, we identified the sialic acid-binding site within the third immunoglobulin-like domain within Lu/BCAM that accounts for the interaction with glycophorin-C and laminin-α5. Last, we present evidence that neuraminidase-expressing pathogens, such as Streptococcus pneumoniae, can similarly induce Lu/BCAM-mediated binding to laminin-α5, by cleaving terminal sialic acid residues from the erythrocyte membrane. These results shed new light on the mechanisms contributing to increased adhesiveness of erythrocytes at the end of their lifespan, possibly facilitating their clearance. Furthermore, this work may contribute to understanding the pathology induced by neuraminidase-positive bacteria, because they are especially harmful to patients suffering from sickle cell disease and are associated with the occurrence of vaso-occlusive crises.
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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: 11] [Impact Index Per Article: 1.6] [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.
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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.
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Kim M, Alapan Y, Adhikari A, Little JA, Gurkan UA. Hypoxia-enhanced adhesion of red blood cells in microscale flow. Microcirculation 2017; 24:10.1111/micc.12374. [PMID: 28387057 PMCID: PMC5679205 DOI: 10.1111/micc.12374] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 04/03/2017] [Indexed: 12/12/2022]
Abstract
OBJECTIVES The advancement of microfluidic technology has facilitated the simulation of physiological conditions of the microcirculation, such as oxygen tension, fluid flow, and shear stress in these devices. Here, we present a micro-gas exchanger integrated with microfluidics to study RBC adhesion under hypoxic flow conditions mimicking postcapillary venules. METHODS We simulated a range of physiological conditions and explored RBC adhesion to endothelial or subendothelial components (FN or LN). Blood samples were injected into microchannels at normoxic or hypoxic physiological flow conditions. Quantitative evaluation of RBC adhesion was performed on 35 subjects with homozygous SCD. RESULTS Significant heterogeneity in RBC adherence response to hypoxia was seen among SCD patients. RBCs from a HEA population showed a significantly greater increase in adhesion compared to RBCs from a HNA population, for both FN and LN. CONCLUSIONS The approach presented here enabled the control of oxygen tension in blood during microscale flow and the quantification of RBC adhesion in a cost-efficient and patient-specific manner. We identified a unique patient population in which RBCs showed enhanced adhesion in hypoxia in vitro. Clinical correlates suggest a more severe clinical phenotype in this subgroup.
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Affiliation(s)
- Myeongseop Kim
- Case Biomanufacturing and Microfabrication Laboratory, Mechanical and Aerospace Engineering Department, Case Western Reserve University, Cleveland, OH, USA
| | - Yunus Alapan
- Case Biomanufacturing and Microfabrication Laboratory, Mechanical and Aerospace Engineering Department, Case Western Reserve University, Cleveland, OH, USA
- Physical Intelligence Department, Max Planck Institute for Intelligent Systems, Stuttgart, Germany
| | - Anima Adhikari
- Case Biomanufacturing and Microfabrication Laboratory, Mechanical and Aerospace Engineering Department, Case Western Reserve University, Cleveland, OH, USA
| | - Jane A. Little
- Department of Hematology and Oncology, School of Medicine, Case Western Reserve University, Cleveland, OH, USA
- Seidman Cancer Center at University Hospitals Cleveland Medical Center, Cleveland, OH, USA
| | - Umut A. Gurkan
- Case Biomanufacturing and Microfabrication Laboratory, Mechanical and Aerospace Engineering Department, Case Western Reserve University, Cleveland, OH, USA
- Department of Hematology and Oncology, School of Medicine, Case Western Reserve University, Cleveland, OH, USA
- Biomedical Engineering Department, Case Western Reserve University, Cleveland, OH, USA
- Department of Orthopaedics, Case Western Reserve University, Cleveland, OH, USA
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An Anti-Human Lutheran Glycoprotein Phage Antibody Inhibits Cell Migration on Laminin-511: Epitope Mapping of the Antibody. PLoS One 2017; 12:e0167860. [PMID: 28060819 PMCID: PMC5218393 DOI: 10.1371/journal.pone.0167860] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2016] [Accepted: 11/21/2016] [Indexed: 11/24/2022] Open
Abstract
The Lutheran glycoprotein (Lu), also known as basal cell adhesion molecule (B-CAM), is an Ig superfamily (IgSF) transmembrane receptor for laminin α5. Although Lu is not present in normal hepatocytes, its expression is significantly increased in hepatocellular carcinoma (HCC). In this study, we isolated thirteen phage antibodies to Lu from a phage library of peripheral blood from HCC patients, suggesting that these patients produced autoantibodies against endogenous Lu. To characterize the phage antibodies, we determined the Lu domains they recognize. The extracellular domain of Lu contains five IgSF domains, D1-D2-D3-D4-D5. The epitope of one phage antibody (A7) was localized to the D5 domain. The other phage antibodies recognized the D2 domain, which is also recognized by a function blocking mouse monoclonal antibody. One of the antibodies to D2 (C7) inhibited the binding of Lu to ligand, and it also prevented tumor cell migration on laminin-511 (LM-511). However, the C7 scFv purified from the periplasm fraction of bacteria did not exhibit the inhibitory effects, indicating that the scFv form could not sterically inhibit the binding of Lu to LM-511. We also identified the amino acid residues that form the epitope recognized by the C7 phage antibody. Mutagenesis studies showed that Arg247 is necessary for forming the epitope. The C7 phage antibody and its epitope may be useful for developing drugs to prevent HCC progression and/or metastasis.
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Telen MJ, Batchvarova M, Shan S, Bovee-Geurts PH, Zennadi R, Leitgeb A, Brock R, Lindgren M. Sevuparin binds to multiple adhesive ligands and reduces sickle red blood cell-induced vaso-occlusion. Br J Haematol 2016; 175:935-948. [PMID: 27549988 DOI: 10.1111/bjh.14303] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 06/27/2016] [Indexed: 12/19/2022]
Abstract
Sevuparin is a novel drug candidate in phase II development as a treatment for vaso-occlusive crises (VOC) in patients with sickle cell disease (SCD). As a heparin-derived polysaccharide, sevuparin has been designed to retain anti-adhesive properties, while the antithrombin-binding domains have been eliminated, substantially diminishing its anticoagulant activity. Here, we demonstrate that sevuparin inhibits the adhesion of human sickle red blood cells (SS-RBCs) to stimulated cultured endothelial cells in vitro. Importantly, sevuparin prevents vaso-occlusion and normalizes blood flow in an in vivo mouse model of SCD vaso-occlusion. Analyses by surface plasmon resonance (SPR) and fluorescence correlation spectroscopy (FCS) demonstrate that sevuparin binds to P- and L-selectins, thrombospondin, fibronectin and von Willebrand factor, all of which are thought to contribute to vaso-occlusion in SCD. Despite low anticoagulation activity, sevuparin has anti-adhesive efficacy similar to the low molecular weight heparin tinzaparin both in vitro and in vivo. These results suggest that the anti-adhesive properties rather than the anticoagulant effects of heparinoids are critical for the treatment of vaso-occlusion in SCD. Therefore, sevuparin is now being evaluated in SCD patients hospitalized for treatment of VOC.
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Affiliation(s)
- Marilyn J Telen
- Division of Hematology, Department of Medicine, Duke Comprehensive Sickle Cell Center, Duke University School of Medicine, Durham, NC, USA
| | - Milena Batchvarova
- Division of Hematology, Department of Medicine, Duke Comprehensive Sickle Cell Center, Duke University School of Medicine, Durham, NC, USA
| | - Siqing Shan
- Division of Hematology, Department of Medicine, Duke Comprehensive Sickle Cell Center, Duke University School of Medicine, Durham, NC, USA
| | - Petra H Bovee-Geurts
- Department of Biochemistry, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Rahima Zennadi
- Division of Hematology, Department of Medicine, Duke Comprehensive Sickle Cell Center, Duke University School of Medicine, Durham, NC, USA
| | | | - Roland Brock
- Department of Biochemistry, Radboud University Medical Center, Nijmegen, The Netherlands
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Sickle cell disease biochip: a functional red blood cell adhesion assay for monitoring sickle cell disease. Transl Res 2016; 173:74-91.e8. [PMID: 27063958 PMCID: PMC4959913 DOI: 10.1016/j.trsl.2016.03.008] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 03/08/2016] [Accepted: 03/12/2016] [Indexed: 01/10/2023]
Abstract
Sickle cell disease (SCD) afflicts millions of people worldwide and is associated with considerable morbidity and mortality. Chronic and acute vaso-occlusion are the clinical hallmarks of SCD and can result in pain crisis, widespread organ damage, and early movtality. Even though the molecular underpinnings of SCD were identified more than 60 years ago, there are no molecular or biophysical markers of disease severity that are feasibly measured in the clinic. Abnormal cellular adhesion to vascular endothelium is at the root of vaso-occlusion. However, cellular adhesion is not currently evaluated clinically. Here, we present a clinically applicable microfluidic device (SCD biochip) that allows serial quantitative evaluation of red blood cell (RBC) adhesion to endothelium-associated protein-immobilized microchannels, in a closed and preprocessing-free system. With the SCD biochip, we have analyzed blood samples from more than 100 subjects and have shown associations between the measured RBC adhesion to endothelium-associated proteins (fibronectin and laminin) and individual RBC characteristics, including hemoglobin content, fetal hemoglobin concentration, plasma lactate dehydrogenase level, and reticulocyte count. The SCD biochip is a functional adhesion assay, reflecting quantitative evaluation of RBC adhesion, which could be used at baseline, during crises, relative to various long-term complications, and before and after therapeutic interventions.
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12
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Bartolini A, Cardaci S, Lamba S, Oddo D, Marchiò C, Cassoni P, Amoreo CA, Corti G, Testori A, Bussolino F, Pasqualini R, Arap W, Corà D, Di Nicolantonio F, Marchiò S. BCAM and LAMA5 Mediate the Recognition between Tumor Cells and the Endothelium in the Metastatic Spreading of KRAS-Mutant Colorectal Cancer. Clin Cancer Res 2016; 22:4923-4933. [PMID: 27143691 DOI: 10.1158/1078-0432.ccr-15-2664] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 03/31/2016] [Indexed: 11/16/2022]
Abstract
PURPOSE KRAS mutations confer adverse prognosis to colorectal cancer, and no targeted therapies have shown efficacy in this patient subset. Paracrine, nongenetic events induced by KRAS-mutant tumor cells are expected to result in specific deregulation and/or relocation of tumor microenvironment (TME) proteins, which in principle can be exploited as alternative therapeutic targets. EXPERIMENTAL DESIGN A multimodal strategy combining ex vivo/in vitro phage display screens with deep-sequencing and bioinformatics was applied to uncover TME-specific targets in KRAS-mutant hepatic metastasis from colorectal cancer. Expression and localization of BCAM and LAMA5 were validated by immunohistochemistry in preclinical models of human hepatic metastasis and in a panel of human specimens (n = 71). The antimetastatic efficacy of two BCAM-mimic peptides was evaluated in mouse models. The role of BCAM in the interaction of KRAS-mutant colorectal cancer cells with TME cells was investigated by adhesion assays. RESULTS BCAM and LAMA5 were identified as molecular targets within both tumor cells and TME of KRAS-mutant hepatic metastasis from colorectal cancer, where they were specifically overexpressed. Two BCAM-mimic peptides inhibited KRAS-mutant hepatic metastasis in preclinical models. Genetic suppression and biochemical inhibition of either BCAM or LAMA5 impaired adhesion of KRAS-mutant colorectal cancer cells specifically to endothelial cells, whereas adhesion to pericytes and hepatocytes was unaffected. CONCLUSIONS These data show that the BCAM/LAMA5 system plays a functional role in the metastatic spreading of KRAS-mutant colorectal cancer by mediating tumor-TME interactions and as such represents a valuable therapeutic candidate for this large, currently untreatable patient group. Clin Cancer Res; 22(19); 4923-33. ©2016 AACR.
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Affiliation(s)
- Alice Bartolini
- Candiolo Cancer Institute-FPO, IRCCS, Candiolo (Turin), Italy
| | - Sabrina Cardaci
- Candiolo Cancer Institute-FPO, IRCCS, Candiolo (Turin), Italy
| | - Simona Lamba
- Candiolo Cancer Institute-FPO, IRCCS, Candiolo (Turin), Italy
| | - Daniele Oddo
- Candiolo Cancer Institute-FPO, IRCCS, Candiolo (Turin), Italy. Department of Oncology, University of Turin, Candiolo (Turin), Italy
| | - Caterina Marchiò
- Department of Medical Sciences, University of Turin, Turin, Italy
| | - Paola Cassoni
- Department of Medical Sciences, University of Turin, Turin, Italy
| | | | - Giorgio Corti
- Candiolo Cancer Institute-FPO, IRCCS, Candiolo (Turin), Italy
| | | | - Federico Bussolino
- Candiolo Cancer Institute-FPO, IRCCS, Candiolo (Turin), Italy. Department of Oncology, University of Turin, Candiolo (Turin), Italy
| | - Renata Pasqualini
- University of New Mexico Comprehensive Cancer Center. Albuquerque, New Mexico. Division of Molecular Medicine, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, New Mexico
| | - Wadih Arap
- University of New Mexico Comprehensive Cancer Center. Albuquerque, New Mexico. Division of Hematology/Oncology, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, New Mexico
| | - Davide Corà
- Candiolo Cancer Institute-FPO, IRCCS, Candiolo (Turin), Italy. Department of Oncology, University of Turin, Candiolo (Turin), Italy
| | - Federica Di Nicolantonio
- Candiolo Cancer Institute-FPO, IRCCS, Candiolo (Turin), Italy. Department of Oncology, University of Turin, Candiolo (Turin), Italy.
| | - Serena Marchiò
- Candiolo Cancer Institute-FPO, IRCCS, Candiolo (Turin), Italy. Department of Oncology, University of Turin, Candiolo (Turin), Italy. University of New Mexico Comprehensive Cancer Center. Albuquerque, New Mexico. Division of Molecular Medicine, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, New Mexico.
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13
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AKAP-dependent modulation of BCAM/Lu adhesion on normal and sickle cell disease RBCs revealed by force nanoscopy. Biophys J 2014; 106:1258-67. [PMID: 24655501 DOI: 10.1016/j.bpj.2014.02.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 01/30/2014] [Accepted: 02/03/2014] [Indexed: 02/02/2023] Open
Abstract
Human normal and sickle red blood cells (RBCs) adhere with high affinity to the alpha5 chain of laminin (LAMA5) via the basal cell adhesion molecule/Lutheran (BCAM/Lu) receptor, which is implicated in vasoocclusive episodes in sickle cell disease and activated through the cyclic adenosine monophosphate (cAMP) signaling pathway. However, the effect of the cAMP pathway on the expression of active BCAM/Lu receptors at the single-molecule level is unknown. We established an in vitro technique, based on atomic force microscopy, which enables detection of single BCAM/Lu proteins on the RBC surface and measures the unbinding force between BCAM/Lu and LAMA5. We showed that the expression of active BCAM/Lu receptors is higher in homozygous sickle RBCs (SS-RBCs) than normal RBCs and that it is critically dependent on the cAMP signaling pathway on both normal and SS-RBCs. Of importance, we illustrated that A-kinase anchoring proteins are crucial for BCAM/Lu receptor activation. Furthermore, we found that SS-RBCs from hydroxyurea-treated patients show a lower expression of active BCAM/Lu receptors, a lower unbinding force to LAMA5, and insignificant stimulation by epinephrine as compared to SS-RBCs from untreated patients. To our knowledge, these findings may lead to novel antiadhesive targets for vasoocclusive episodes in sickle cell disease.
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Dominical VM, Vital DM, O'Dowd F, Saad STO, Costa FF, Conran N. In vitro microfluidic model for the study of vaso-occlusive processes. Exp Hematol 2014; 43:223-8. [PMID: 25461252 DOI: 10.1016/j.exphem.2014.10.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Revised: 10/17/2014] [Accepted: 10/30/2014] [Indexed: 12/25/2022]
Abstract
Vaso-occlusion, responsible for much of the morbidity of sickle-cell disease, is a complex multicellular process, apparently triggered by leukocyte adhesion to the vessel wall. The microcirculation represents a major site of leukocyte-endothelial interactions and vaso-occlusive processes. We have developed a biochip with subdividing interconnecting microchannels that decrease in size (40 μm to 10 μm in width), for use in conjunction with a precise microfluidic device, to mimic cell flow and adhesion through channels of sizes that approach those of the microcirculation. The biochips were utilized to observe the dynamics of the passage of neutrophils and red blood cells, isolated from healthy and sickle-cell anemia (SCA) individuals, through laminin or endothelial adhesion molecule-coated microchannels at physiologically relevant rates of flow and shear stress. Obstruction of E-selectin/intercellular adhesion molecule 1-coated biochip microchannels by SCA neutrophils was significantly greater than that observed for healthy neutrophils, particularly in the microchannels of 40-15 μm in width. Whereas SCA red blood cells alone did not significantly adhere to, or obstruct, microchannels, mixed suspensions of SCA neutrophils and red blood cells significantly adhered to and obstructed laminin-coated channels. Results from this in vitro microfluidic model support a primary role for leukocytes in the initiation of SCA occlusive processes in the microcirculation. This assay represents an easy-to-use and reproducible in vitro technique for understanding molecular mechanisms and cellular interactions occurring in subdividing microchannels of widths approaching those observed in the microvasculature. The assay could hold potential for testing drugs developed to inhibit occlusive mechanisms such as those observed in SCA and thrombotic diseases.
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Affiliation(s)
- Venina M Dominical
- INCT de Sangue, Hematology and Hemotherapy Center, School of Medicine, University of Campinas, Campinas, São Paulo, Brazil
| | - Daiana M Vital
- INCT de Sangue, Hematology and Hemotherapy Center, School of Medicine, University of Campinas, Campinas, São Paulo, Brazil
| | | | - Sara T O Saad
- INCT de Sangue, Hematology and Hemotherapy Center, School of Medicine, University of Campinas, Campinas, São Paulo, Brazil
| | - Fernando F Costa
- INCT de Sangue, Hematology and Hemotherapy Center, School of Medicine, University of Campinas, Campinas, São Paulo, Brazil
| | - Nicola Conran
- INCT de Sangue, Hematology and Hemotherapy Center, School of Medicine, University of Campinas, Campinas, São Paulo, Brazil.
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15
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De Oliveira S, Vitorino de Almeida V, Calado A, Rosário HS, Saldanha C. Integrin-associated protein (CD47) is a putative mediator for soluble fibrinogen interaction with human red blood cells membrane. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2011; 1818:481-90. [PMID: 22079249 DOI: 10.1016/j.bbamem.2011.10.028] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Revised: 10/12/2011] [Accepted: 10/27/2011] [Indexed: 10/15/2022]
Abstract
Fibrinogen is a multifunctional plasma protein that plays a crucial role in several biological processes. Elevated fibrinogen induces erythrocyte hyperaggregation, suggesting an interaction between this protein and red blood cells (RBCs). Several studies support the concept that fibrinogen interacts with RBC membrane and this binding, due to specific and non-specific mechanisms, may be a trigger to RBC hyperaggregation in inflammation. The main goals of our work were to prove that human RBCs are able to specifically bind soluble fibrinogen, and identify membrane molecular targets that could be involved in this process. RBCs were first isolated from blood of healthy individuals and then separated in different age fractions by discontinuous Percoll gradients. After isolation RBC samples were incubated with human soluble fibrinogen and/or with a blocking antibody against CD47 followed by fluorescence confocal microscopy, flow cytometry acquisitions and zeta potential measurements. Our data show that soluble fibrinogen interacts with the human RBC membrane in an age-dependent manner, with younger RBCs interacting more with soluble fibrinogen than the older cells. Importantly, this interaction is abrogated in the presence of a specific antibody against CD47. Our results support a specific and age-dependent interaction of soluble fibrinogen with human RBC membrane; additionally we present CD47 as a putative mediator in this process. This interaction may contribute to RBC hyperaggregation in inflammation.
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16
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An antibody to the lutheran glycoprotein (Lu) recognizing the LU4 blood type variant inhibits cell adhesion to laminin α5. PLoS One 2011; 6:e23329. [PMID: 21858073 PMCID: PMC3155534 DOI: 10.1371/journal.pone.0023329] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Accepted: 07/13/2011] [Indexed: 11/23/2022] Open
Abstract
Background The Lutheran blood group glycoprotein (Lu), an Ig superfamily (IgSF) transmembrane receptor, is also known as basal cell adhesion molecule (B-CAM). Lu/B-CAM is a specific receptor for laminin α5, a major component of basement membranes in various tissues. Previous reports have shown that Lu/B-CAM binding to laminin α5 contributes to sickle cell vaso-occlusion. However, as there are no useful tools such as function-blocking antibodies or drugs, it is unclear how epithelial and sickled red blood cells adhere to laminin α5 via Lu/B-CAM. Methodology/Principal Findings In this study, we discovered a function-blocking antibody that inhibits Lu binding to laminin α5 using a unique binding assay on tissue sections. To characterize the function-blocking antibody, we identified the site on Lu/B-CAM recognized by this antibody. The extracellular domain of Lu/B-CAM contains five IgSF domains, D1-D2-D3-D4-D5. The antibody epitope was localized to D2, but not to the D3 domain containing the major part of the laminin α5 binding site. Furthermore, mutagenesis studies showed that Arg175, the LU4 blood group antigenic site, was crucial for forming the epitope and the antibody bound sufficiently close to sterically hinder the interaction with α5. Cell adhesion assay using the antibody also showed that Lu/B-CAM serves as a secondary receptor for the adhesion of carcinoma cells to laminin α5. Conclusion/Significance This function-blocking antibody against Lu/B-CAM should be useful for not only investigating cell adhesion to laminin α5 but also for developing drugs to inhibit sickle cell vaso-occlusion.
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17
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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.
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18
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Abstract
Antigens of 23 of the 30 human blood group systems are defined by the amino acid sequence of red cell membrane proteins. The antigens of DI, RH, RHAG, MNS, GE and CO systems are carried on blood group-active proteins (Band 3, D and CE polypeptides, RhAG, Glycophorins A and B, Glycophorins C and D and Aquaporin 1, respectively) which are expressed at high levels (>200,000 copies/red cell). These major proteins contribute to essential red cell functions either directly as membrane transporters and by providing linkage to the underlying red cell skeleton or by facilitating the membrane assembly of the protein complexes involved in these processes. The proteins expressing antigens of the remaining 17 blood group systems are much less abundant (<20,000 copies/red cell) and their functional importance for the circulating red cell is largely unknown. Human gene knock-outs (null phenotypes) have been described for many of these minor blood group-active proteins, but only absence of Kx glycoprotein has been clearly linked with pathology directly related to the function of circulating red cells. Recent evidence suggesting the normal quality control system for glycoprotein synthesis is altered during the latter stages of red cell production raises the possibility that many of these low abundance blood group-active proteins are vestigial. In sickle cell disease and polycythaemia vera, elevated Lutheran glycoprotein expression may contribute to pathology. Dyserythropoiesis with reduced antigen expression can result from mutations in the erythroid transcription factors GATA-1 and EKLF.
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Affiliation(s)
- D J Anstee
- Bristol Institute for Transfusion Sciences, NHS Blood and Transplant, Bristol, UK.
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19
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Lazar-Karsten P, Dorn I, Meyer G, Lindner U, Driller B, Schlenke P. The influence of extracellular matrix proteins and mesenchymal stem cells on erythropoietic cell maturation. Vox Sang 2010; 101:65-76. [DOI: 10.1111/j.1423-0410.2010.01453.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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21
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Gayen Betal S, Setty BNY. Phosphatidylserine-positive erythrocytes bind to immobilized and soluble thrombospondin-1 via its heparin-binding domain. Transl Res 2008; 152:165-77. [PMID: 18940719 PMCID: PMC2628802 DOI: 10.1016/j.trsl.2008.07.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2008] [Revised: 07/22/2008] [Accepted: 07/26/2008] [Indexed: 11/30/2022]
Abstract
Phosphatidylserine (PS)-dependent erythrocyte adhesion to endothelium and subendothelial matrix components is mediated in part via thrombospondin (TSP). Although TSP exhibits multiple cell-binding domains, the PS-binding site on TSP is unknown. Because a cell-binding domain for anionic heparin is located at the amino-terminus, we hypothesized that PS-positive red blood cells (PS(+ve)-RBCs) bind to this domain. We demonstrate that both heparin and its low-molecular-weight derivative enoxaparin (0.5-50 u/mL) inhibited PS(+ve)-RBC adhesion to immobilized TSP in a concentration-dependent manner (21% to 77% inhibition, P < 0.05). Preincubation of immobilized TSP with an antibody against the heparin-binding domain blocked PS(+ve)-RBC adhesion to TSP. Antibodies that recognize the collagen- and the carboxy-terminal CD47-binding domain on TSP had no effect on this process. Although preincubation of PS(+ve)-RBCs with TSP peptides from the heparin-binding domain that contained the specific heparin-binding motif KKTRG inhibited PS(+ve)-erythrocyte adhesion to matrix TSP (P < 0.001), these peptides in the immobilized form supported PS-mediated erythrocyte adhesion. A TSP-peptide that lacks the binding motif neither inhibited nor supported PS(+ve)-RBC adhesion. Additional experiments show that soluble TSP also interacted with PS(+ve)-RBCs via its heparin-binding domain. Our results demonstrate that PS-positive erythrocytes bind to both immobilized and soluble TSP via its heparin-binding domain and that both heparin and enoxaparin, at clinically relevant concentrations, block this interaction. Other studies have shown that heparin inhibited P-selectin- and soluble-TSP-mediated sickle erythrocyte adhesion to endothelial cells. Our results, taken together with the previously documented findings, provide a rational basis for clinical use of heparin or its low-molecular-weight derivatives as therapeutic agents in treating vaso-occlusive pain in patients with sickle cell disease.
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Affiliation(s)
- Suhita Gayen Betal
- Marian Anderson Comprehensive Sickle Cell Anemia Care and Research Center, Department of Pediatrics, Jefferson Medical College, Thomas Jefferson University, Philadelphia, PA 19107, USA
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Abstract
Erythroblastic islands, the specialized niches in which erythroid precursors proliferate, differentiate, and enucleate, were first described 50 years ago by analysis of transmission electron micrographs of bone marrow. These hematopoietic subcompartments are composed of erythroblasts surrounding a central macrophage. A hiatus of several decades followed, during which the importance of erythroblastic islands remained unrecognized as erythroid progenitors were shown to possess an autonomous differentiation program with a capacity to complete terminal differentiation in vitro in the presence of erythropoietin but without macrophages. However, as the extent of proliferation, differentiation, and enucleation efficiency documented in vivo could not be recapitulated in vitro, a resurgence of interest in erythroid niches has emerged. We now have an increased molecular understanding of processes operating within erythroid niches, including cell-cell and cell-extracellular matrix adhesion, positive and negative regulatory feedback, and central macrophage function. These features of erythroblast islands represent important contributors to normal erythroid development, as well as altered erythropoiesis found in such diverse diseases as anemia of inflammation and chronic disease, myelodysplasia, thalassemia, and malarial anemia. Coupling of historical, current, and future insights will be essential to understand the tightly regulated production of red cells both in steady state and stress erythropoiesis.
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23
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Role and regulation of sickle red cell interactions with other cells: ICAM-4 and other adhesion receptors. Transfus Clin Biol 2008; 15:23-8. [PMID: 18502676 DOI: 10.1016/j.tracli.2008.04.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2008] [Accepted: 04/16/2008] [Indexed: 11/21/2022]
Abstract
Erythrocytes containing primarily hemoglobin S (SS RBCs) are abnormally adherent. We now know that SS RBCs express numerous adhesion molecules, and that many of these can undergo activation. SS RBCs exposed briefly to epinephrine show markedly increased adhesion to both laminin and endothelial cells. In vivo, infusion of epinephrine-activated but not unstimulated SS RBCs causes RBC adhesion, vaso-occlusion, organ trapping, and shortened RBC survival in the circulation. Epinephrine treatment of SS RBCs before infusion also induces adhesion of murine leukocytes to vascular walls. Indeed, in vitro, SS RBCs can activate leukocyte adhesion and cytokine production. We now have demonstrated both in vitro and in vivo evidence for the importance of RBC signaling and have also shown that SS RBC adhesion is determined by genetic polymorphisms in the signaling pathway that activates adhesion. These advances will hopefully lead to new therapeutic modalities for sickle cell disease.
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Burton NM, Brady RL. Molecular structure of the extracellular region of Lutheran blood group glycoprotein and location of the laminin binding site. Blood Cells Mol Dis 2008; 40:446-8. [PMID: 18302987 DOI: 10.1016/j.bcmd.2008.01.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2008] [Accepted: 01/04/2008] [Indexed: 10/22/2022]
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Eyler CE, Jackson T, Elliott LE, De Castro LM, Jonassaint J, Ashley-Koch A, Telen MJ. β2-Adrenergic receptor and adenylate cyclase gene polymorphisms affect sickle red cell adhesion. Br J Haematol 2008; 141:105-8. [DOI: 10.1111/j.1365-2141.2008.07008.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
The external membrane of the red cell contains numerous proteins that either cross the lipid bilayer one or more times or are anchored to it through a lipid tail. Many of these proteins express blood group activity. The functions of some of these proteins are known; in others their function can only be surmised from the protein structure or from limited experimental evidence. They are loosely divided into four categories based on their functions: membrane transporters; adhesion molecules and receptors; enzymes; and structural proteins that link the membrane with the membrane skeleton. Some of the proteins carry out more than one of these functions. Some proteins may complete their major functions during erythropoiesis or may only be important under adverse physiological conditions. Furthermore, some might be evolutionary relics and may no longer have significant functions. Polymorphisms or rare changes in red cell surface proteins are often responsible for blood groups. The biological significance of these polymorphisms or the selective pressures responsible for their stability within populations are mostly not known, although exploitation of the proteins by pathogenic micro-organisms has probably played a major role.
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Affiliation(s)
- G Daniels
- Bristol Institute for Transfusion Sciences, National Health Service Blood and Transplant, Bristol, UK.
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Karamatic Crew V, Mallinson G, Green C, Poole J, Uchikawa M, Tani Y, Geisen C, Oldenburg J, Daniels G. Different inactivating mutations in the LU genes of three individuals with the Lutheran-null phenotype. Transfusion 2007; 47:492-8. [PMID: 17319831 DOI: 10.1111/j.1537-2995.2006.01141.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
BACKGROUND The null phenotype of the Lutheran blood group system, Lu(null) or Lu(a-b-), is characterized by the lack of all Lutheran system antigens. It can arise from three genetic backgrounds: recessive, dominant, or X-linked. Lu(null) of the recessive type appears to result from homozygosity for an inactive LU gene. STUDY DESIGN AND METHODS Three unrelated recessive Lu(null) individuals were assessed by standard serologic tests. All exons of the LU gene were directly sequenced from amplified genomic DNA. The validity of the observed mutations within the LU gene was confirmed by the use of either restriction enzymes or allele-specific primers. RESULTS All three individuals had the serologic characteristics of recessive Lu(null). One individual was doubly heterozygous for a nonsense mutation 691C>T in exon 6 (Arg231STOP) and a deletion of LU exons 3 and 4. The other two samples showed homozygous nonsense mutations: one had 711C>A in exon 6 (Cys237STOP) and the other 361C>T in exon 3 (Arg121STOP). CONCLUSIONS The results revealed four unique genetic backgrounds from three examples of the rare recessive Lu(null) phenotype, each encoding Lutheran glycoproteins with a disrupted structure.
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Affiliation(s)
- Vanja Karamatic Crew
- Bristol Institute for Transfusion Sciences and International Blood Group Reference Laboratory, Bristol, UK
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Telen MJ. Role of adhesion molecules and vascular endothelium in the pathogenesis of sickle cell disease. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2007; 2007:84-90. [PMID: 18024614 DOI: 10.1182/asheducation-2007.1.84] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A number of lines of evidence now support the hypothesis that vaso-occlusion and several of the sequelae of sickle cell disease (SCD) arise, at least in part, from adhesive interactions of sickle red blood cells, leukocytes, and the endothelium. Both experimental and genetic evidence provide support for the importance of these interactions. It is likely that future therapies for SCD might target one or more of these interactions.
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Affiliation(s)
- Marilyn J Telen
- Duke Univ. Med. Ctr., Division of Hematology, Box 2615, Durham, NC 27710-0001, USA.
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29
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Lee G, Lo A, Short SA, Mankelow TJ, Spring F, Parsons SF, Yazdanbakhsh K, Mohandas N, Anstee DJ, Chasis JA. Targeted gene deletion demonstrates that the cell adhesion molecule ICAM-4 is critical for erythroblastic island formation. Blood 2006; 108:2064-71. [PMID: 16690966 PMCID: PMC1895542 DOI: 10.1182/blood-2006-03-006759] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Erythroid progenitors differentiate in erythroblastic islands, bone marrow niches composed of erythroblasts surrounding a central macrophage. Evidence suggests that within islands adhesive interactions regulate erythropoiesis and apoptosis. We are exploring whether erythroid intercellular adhesion molecule 4 (ICAM-4), an immunoglobulin superfamily member, participates in island formation. Earlier, we identified alpha(V) integrins as ICAM-4 counterreceptors. Because macrophages express alpha(V), ICAM-4 potentially mediates island attachments. To test this, we generated ICAM-4 knock-out mice and developed quantitative, live cell techniques for harvesting intact islands and for re-forming islands in vitro. We observed a 47% decrease in islands reconstituted from ICAM-4 null marrow compared to wild-type marrow. We also found a striking decrease in islands formed in vivo in knock-out mice. Further, peptides that block ICAM-4/alpha(V) adhesion produced a 53% to 57% decrease in reconstituted islands, strongly suggesting that ICAM-4 binding to macrophage alpha(V) functions in island integrity. Importantly, we documented that alpha(V) integrin is expressed in macrophages isolated from erythroblastic islands. Collectively, these data provide convincing evidence that ICAM-4 is critical in erythroblastic island formation via ICAM-4/alpha(V) adhesion and also demonstrate that the novel experimental strategies we developed will be valuable in exploring molecular mechanisms of erythroblastic island formation and their functional role in regulating erythropoiesis.
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Affiliation(s)
- Gloria Lee
- Life Sciences Division, University of California, Lawrence Berkeley National Laboratory, Bldg 74, 1 Cyclotron Road, Berkeley, CA 94720, USA
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30
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Abstract
The Lutheran blood group system, which comprises one of the largest families of human red blood cell (RBC) antigens, resides on two immunoglobulin superfamily (IgSF) proteins: Lutheran and basal cell adhesion molecule (B-CAM). These two glycoproteins arise via alternative splicing of mRNA from a single gene and differ in structure only in the lengths of their cytoplasmic tails. Both are expressed on RBCs as well as a variety of other cell types, and they are overexpressed on sickle RBCs (SS RBC). B-CAM/Lu is the critical receptor for SS RBC adhesion to the extracellular matrix protein laminin, an interaction thought to contribute to the pathogenesis of sickle cell-related vasoocclusive events. Recent work has also shown that B-CAM/Lu on RBCs can undergo activation as a result of adrenergic signaling pathways. The high affinity of B-CAM/Lu for laminin is also thought to contribute to various developmental processes, including organogenesis, vascular development, erythropoiesis, and smooth muscle development and organization. Interestingly, the B-CAM spliceoform seems to be overexpressed by a variety of different malignant tumors and may be involved, along with other adhesion receptor proteins, in malignant transformation and tumor metastasis. Studies of B-CAM/Lu have thus expanded from defining antigen-specific polymorphisms to investigations of processes involved in sickle cell disease, human development, and cancer biology.
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Affiliation(s)
- Christine E Eyler
- Duke Comprehensive Sickle Cell Center and Division of Hematology, Department of Medicine, Duke University, Durham, NC 27710, USA
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31
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Vainionpää N, Kikkawa Y, Lounatmaa K, Miner JH, Rousselle P, Virtanen I. Laminin-10 and Lutheran blood group glycoproteins in adhesion of human endothelial cells. Am J Physiol Cell Physiol 2005; 290:C764-75. [PMID: 16236823 DOI: 10.1152/ajpcell.00285.2005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Laminin alpha5-chain, a constituent of laminins-10 and -11, is expressed in endothelial basement membranes. In this study we evaluated the roles of alpha5 laminins and Lutheran blood group glycoproteins (Lu), recently identified receptors of the laminin alpha5-chain, in the adhesion of human dermal microvascular and pulmonary artery endothelial cells. Field emission scanning electron microscopy and immunohistochemistry showed that the endothelial cells spread on laminin-10 and formed fibronectin-positive fibrillar adhesion structures. Immunoprecipitation results suggested that the cells produced fibronectin, which they could use as adhesion substratum, during the adhesion process. When the protein synthesis during the adhesion was inhibited with cycloheximide, the formation of fibrillar adhesions on laminin-10 was abolished, suggesting that laminin-10 does not stimulate the formation of any adhesion structures. Northern and Western blot analyses showed that the cells expressed M(r) 78,000 and 85,000 isoforms of Lu. Quantitative cell adhesion assays showed that in the endothelial cell adhesion to laminin-10, Lu acted in concert with integrins beta(1) and alpha(v)beta(3), whereas in the adhesion to laminin-10/11, Lu and integrin beta(1) were involved. In the cells adhering to the alpha5 laminins, Lu and the integrins showed uniform cell surface distribution. These findings indicate that alpha5 laminins stimulate endothelial cell adhesion but not the formation of fibrillar or focal adhesions. Lu mediates the adhesion of human endothelial cells to alpha5 laminins in collaboration with integrins beta(1) and alpha(v)beta(3).
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Affiliation(s)
- Noora Vainionpää
- Institute of Biomedicine/Anatomy, PO Box 63, Haartmaninkatu 8, University of Helsinki, FIN-00014 Helsinki, Finland.
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32
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Abstract
During the second half of the 20th century, blood bankers quickly expanded our knowledge of human erythrocyte blood group antigens. By the dawn of the 21st century, several hundred blood group antigen polymorphisms had been identified. Hot on the heels of the serologists, membrane biochemists and molecular geneticists defined both the biochemical and genetic bases of most of these antigens. Perhaps to their surprise, this work has led to the discovery of functionally diverse and important membrane proteins expressed on the surface of red cells, including numerous adhesion molecules. Red cells express an unexpected number of such adhesion receptors, some of which contribute to human disease, as well as to normal red cell development. And perhaps most interestingly, study of these molecules has elucidated ways in which even mature red cells respond to external stimuli, such as adrenergic hormones.
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Affiliation(s)
- Marilyn J Telen
- Duke University Medical Canter, Duke-UNC Comprehensive Sickle Cell Center, Durham, NC 27710, USA.
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33
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Gauthier E, Rahuel C, Wautier MP, El Nemer W, Gane P, Wautier JL, Cartron JP, Colin Y, Le Van Kim C. Protein kinase A-dependent phosphorylation of Lutheran/basal cell adhesion molecule glycoprotein regulates cell adhesion to laminin alpha5. J Biol Chem 2005; 280:30055-62. [PMID: 15975931 DOI: 10.1074/jbc.m503293200] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Lutheran (Lu) blood group and basal cell adhesion molecule (B-CAM) antigens reside on two glycoprotein (gp) isoforms Lu and Lu(v13) that belong to the Ig superfamily and differ only by the size of their cytoplasmic tail. Lu/B-CAM gps have been recognized as laminin alpha5 receptors on red blood cells and epithelial cells in multiple tissues. It has been shown that sickle red cells exhibit enhanced adhesion to laminin alpha5 when intracellular cAMP is up-regulated by physiological stimuli such as epinephrine and that this signaling pathway is protein kinase A- and Lu/B-CAM-dependent. In this study, we analyzed the relationship between the phosphorylation status of Lu/B-CAM gps and their adhesion function to laminin alpha5. We showed that Lu isoform was phosphorylated in sickle red cells as well as in erythroleukemic K562 and epithelial Madin-Darby canine kidney cells and that this phosphorylation is enhanced by different stimuli of the PKA pathway. Lu gp is phosphorylated by glycogen synthase kinase 3 beta, casein kinase II, and PKA at serines 596, 598, and 621, respectively. Alanine substitutions of serines 596 and 598 abolished phosphorylation by glycogen synthase kinase 3 beta and casein kinase II, respectively, but had no effect on adhesion of K562 cells to laminin under flow conditions. Conversely, mutation of serine 621 prevented phosphorylation by PKA and dramatically reduced cell adhesion. Furthermore, stimulation of K562 cells by epinephrine increased Lu gp phosphorylation by PKA and enhanced adhesion to laminin. It is postulated that modulation of the phosphorylation state of Lu gp might be a critical factor for the sickle red cells adhesiveness to laminin alpha5 in sickle cell disease.
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34
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Abstract
The Lutheran blood group glycoprotein (Lu), also known as basal cell adhesion molecule (B-CAM), is a transmembrane receptor with five immunoglobulin-like domains in its extracellular region; it is therefore classified as a member of the immunoglobulin (Ig) gene family. Lu/B-CAM is observed not only on red blood cells, but also on a subset of muscle and epithelial cells in various tissues. Recently, several groups have reported that Lu/B-CAM is a novel receptor for laminin a5. The laminin a5 chain is a component of the laminin-511 (alpha 5 beta 1 gamma 1), -521 (alpha 5 beta 2 gamma 1), and -523 (alpha 5 beta 2 gamma 3) heterotrimers and is expressed throughout the mammalian body. We also have shown that Lu/B-CAM is co-localized with laminin alpha 5 in various tissues. Although the biological role of Lu/B-CAM remains unclear, the specific binding of Lu/B-CAM to laminin alpha 5 suggests that it plays an important role in developmental and physiological processes. It also is necessary to investigate further the interaction between Lu/B-CAM and laminin a5 in pathological processes, including sickle cell disease and cancer.
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Affiliation(s)
- Yamato Kikkawa
- Department of Pathophysiology, Cancer Research Institute, Sapparo Medical University, School of Medicine, Sapparo, Japan.
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35
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Abstract
The blood-brain barrier (BBB) is an impermeable cellular interface that physically separates the blood from the interstices of the brain. The endothelial cells lining the brain blood vessels form the principle barrier, and their unique phenotype is a consequence of dynamic interactions with several perivascular cell types present in the brain parenchyma. In addition, BBB dysfunction has been observed in the large majority of neurological diseases, but the causes of aberrant vascular behavior are generally unknown. Because of its barrier phenotype, drug delivery to the brain has also proven to be a very difficult task. Global genomics and proteomics analyses are currently being used to examine BBB function in healthy and diseased brain to better characterize this dynamic interface. It is becoming increasingly evident that these approaches have the potential to clarify the unique attributes of a healthy BBB, to identify therapeutic targets in diseased brain, and to identify novel conduits for noninvasive delivery of drugs against these targets. This review will discuss the application of genomics and proteomics to blood-brain barrier research and will offer views on the prospects of such approaches.
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Affiliation(s)
- Eric V Shusta
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
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36
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Murphy MM, Zayed MA, Evans A, Parker CE, Ataga KI, Telen MJ, Parise LV. Role of Rap1 in promoting sickle red blood cell adhesion to laminin via BCAM/LU. Blood 2004; 105:3322-9. [PMID: 15613546 DOI: 10.1182/blood-2004-07-2881] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Vaso-occlusion is a hallmark of sickle cell disease. Agonist-induced activation of sickle red blood cells (SS RBCs) promotes their adhesion to vascular proteins, potentially contributing to vasoocclusion. Previously, we described a cyclic adenosine monophosphate (cAMP)-dependent increase in SS RBC adhesion to laminin. Here, we investigated whether Rap1, a small guanosine triphosphatase (GTPase) known to promote integrin-mediated adhesion in other cells, was involved in this signaling pathway. We found that agonists known to induce cAMP signaling promoted the GTP-bound, active state of Rap1 in SS RBCs. The cAMP-dependent exchange factor Epac (exchange protein directly activated by cAMP) is a likely upstream activator of Rap1, since Epac is present in these cells and the Epac-specific cAMP analog 8CPT-2-Me (8-(4-cholorophenylthio)-2'-O-methyl-cAMP) activated Rap1 and promoted SS RBC adhesion to laminin. This 8CPT-2-Me-stimulated adhesion was integrin independent, since it was insensitive to RGD peptide or antibodies against the only known integrin on SS RBCs, alpha4beta1. However, this adhesion was completely inhibited by either a soluble version of basal cell adhesion molecule/Lutheran (BCAM/LU) or a BCAM/LU adhesion-blocking anti-body. Surprisingly, 8CPT-2-Me-activated Rap1 did not promote SS RBC adhesion to a known alpha4beta1 ligand, vascular cell adhesion molecule 1 (VCAM-1). These results demonstrate that Epac-induced Rap1 activation in SS RBCs promotes BCAM/LU-mediated adhesion to laminin. Thus, Epac-mediated Rap1 activation may represent an important signaling pathway for promoting SS RBC adhesion.
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Affiliation(s)
- Meghan M Murphy
- Department of Pharmacology, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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37
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Abstract
Red blood cell (RBC) blood group antigens are polymorphic, inherited, carbohydrate or protein structures located on the extracellular surface of the RBC membrane. They contribute to the architecture of the RBC membrane, and their individual function(s) are being slowly revealed. The biological qualities assigned to these RBC membrane structures are based on observed physiological alteration in RBCs that lack the component, by documenting similarities in its protein sequence (predicted from the nucleotide sequence of the gene) to proteins of known function and by extrapolation to identified functional homologues in other cells. The varied roles of RBC antigens include membrane structural integrity, the transport of molecules through the membrane, as receptors for extracellular ligands, adhesion molecules, enzymes, complement components and regulators, and in glycocalyx formation.
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Affiliation(s)
- Marion E Reid
- Laboratology of Immunology and the Lindsley F. Kimball Research Institute, New York Blood Center, 310 E. 67th Street, New York, NY 10021, USA
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38
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Drewniok C, Schön M, Schön MP. Basal cell adhesion molecule is inversely associated with apoptosis, but plays a limited role for protection against apoptotic stimuli. Skin Pharmacol Physiol 2004; 17:304-9. [PMID: 15528961 DOI: 10.1159/000081116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2004] [Accepted: 06/25/2004] [Indexed: 11/19/2022]
Abstract
Basal cell adhesion molecule (B-CAM) is strongly upregulated in epithelial skin cancer cells in vivo and in vitro. We have tested here whether B-CAM is (1) inversely associated with or (2) functionally involved in apoptosis. Towards this end, B-CAM expression was assessed in HaCaT transfectants overexpressing murine Bcl-2 and untransfected HaCaT cells exposed to various proapoptotic stimuli. In another series of experiments, we overexpressed B-CAM in HaCaT cells and different fibroblast lines, and stimulated various apoptotic pathways in the transfectants and control cells. In addition, apoptosis was assessed after an antibody-mediated B-CAM blockade. We could demonstrate that expression of B-CAM is inversely associated with the susceptibility of cells to apoptosis. However, overexpression or antibody- mediated inhibition of B-CAM had only limited functional effects on cellular apoptosis.
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Affiliation(s)
- C Drewniok
- Rudolf-Virchow Center, DFG Research Center for Experimental Biomedicine, and Department of Dermatology and Venereology, University of Würzburg, Würzburg, Germany
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39
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Vittitow J, Borrás T. Genes expressed in the human trabecular meshwork during pressure-induced homeostatic response. J Cell Physiol 2004; 201:126-37. [PMID: 15281095 DOI: 10.1002/jcp.20030] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Physiological pressure inside the eye is maintained by a resistance mechanism provided by the trabecular meshwork tissue. In most cases, prolonged, elevated pressure leads to an eye pathology characterized by retinal ganglion cell (RGC) degeneration, optic nerve damage, and non-remedial blindness. We are investigating the regulation of trabecular meshwork genes in response to elevated pressure. Using perfused organ cultures from postmortem human donors, we have previously demonstrated the presence of a homeostatic mechanism at 2-4 days of pressure insult (Borrás et al. 2002, Invest Ophthalmol Vis Sci 43:33-40). Here, we sought to identify trabecular meshwork genes whose expression was altered during this homeostatic period. By macroarray hybridization, we compared the expression profiles of high-pressure (HP) and normal-pressure (NP) treated eyes from the same individual (n = 3 pairs). Our results identified 40 upregulated and 14 downregulated genes. The highest proportion of upregulated genes encoded proteins involved in signal transduction (32%). Among the potentially relevant genes, PIP 5K1C, VIP, tropomodulin, and MMP2 encoded mediators known to influence outflow resistance. Others encoded functions which are new for the trabecular meshwork, but which are intrinsic to unrelated tissues. These new mechanisms appear as they could be of benefit for trabecular meshwork function. Matrix Gla protein (MGP), perlecan, osteomodulin, and osteoblast-specific factor are essential in cartilage and bone physiology whereas spectrin and ICAM4 are specific for blood cells and crucial in maintaining their shape and adhesion. In addition, MGP transcripts were stimulated by extracellular calcium and downregulated by TGF-beta1. We propose that MGP might be an important player in the adaptive homeostatic mechanism by contributing to maintain a softer trabecular meshwork tissue and facilitate aqueous humor outflow.
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Affiliation(s)
- Jason Vittitow
- Department of Ophthalmology, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
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40
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Drewniok C, Wienrich BG, Schön M, Ulrich J, Zen Q, Telen MJ, Hartig RJ, Wieland I, Gollnick H, Schön MP. Molecular interactions of B-CAM (basal-cell adhesion molecule) and laminin in epithelial skin cancer. Arch Dermatol Res 2004; 296:59-66. [PMID: 15278364 DOI: 10.1007/s00403-004-0481-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2003] [Revised: 04/20/2004] [Accepted: 05/06/2004] [Indexed: 10/26/2022]
Abstract
Molecular events underlying the progression of malignant tumors through the surrounding tissue are largely mediated by membrane-bound adhesion molecules. Basal-cell adhesion molecule (B-CAM), a 90-kDa laminin receptor of the immunoglobulin superfamily, is induced in some epithelial malignancies. Its function in these tumors, however, still remains obscure. We demonstrated that expression of B-CAM is very weak, if detectable at all, in normal epidermis but is strongly induced in both basal cell carcinomas and squamous cell carcinomas of the skin, and most pronounced at the basal surface of the tumor nests. Interestingly, the only known B-CAM ligand, laminin, was markedly upregulated within corresponding microanatomical sites surrounding the tumor nests, suggesting that both molecules may interact there. Consistent with this hypothesis, we were able to directly demonstrate binding of a B-CAM/Fc chimeric molecule to the peritumoral stroma in situ. Finally, in proof-of-principle experiments, human B-CAM was overexpressed both in murine and in human fibroblasts. The haptotactic migration of these novel B-CAM+ cell populations on a laminin matrix was significantly increased (P = 0.02) as compared to mock-transfected cells when integrin-mediated adhesion was blocked by chelation of divalent cations. Thus, our findings provide the first direct experimental evidence that interactions of B-CAM and laminin may be involved in progression of epithelial skin tumors.
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Affiliation(s)
- Claudia Drewniok
- Rudolf Virchow Center, DFG Research Center for Experimental Biomedicine and Department of Dermatology, University of Würzburg, Würzburg, Germany
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41
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Zen Q, Batchvarova M, Twyman CA, Eyler CE, Qiu H, De Castro LM, Telen MJ. B-CAM/LU expression and the role of B-CAM/LU activation in binding of low- and high-density red cells to laminin in sickle cell disease. Am J Hematol 2004; 75:63-72. [PMID: 14755370 DOI: 10.1002/ajh.10442] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Red blood cells from patients with sickle cell disease (SS RBC) adhere to laminin and over-express the high-affinity laminin receptor basal cell adhesion molecule/Lutheran protein (B-CAM/LU). This receptor has recently been shown to undergo activation in vitro through a protein kinase A-dependent mechanism. Low-density SS RBC express two-thirds more B-CAM/LU than high-density SS RBC. However, high-density SS RBC have been identified as most adherent to laminin under flow conditions. We investigated the ability of low- and high-density SS RBC to interact with laminin under various conditions and explored factors that might be responsible for the differences in B-CAM/LU-laminin interaction between high- and low-density SS RBC. We confirmed that high-density SS RBC adhere to laminin more strongly than low-density SS RBC under flow conditions. However, low-density SS RBC bind soluble laminin most strongly and are the most adherent to laminin under static conditions. Soluble recombinant Lutheran extracellular domain protein completely blocked SS RBC adhesion to laminin under both static and flow conditions. The protein kinase A inhibitor 14-22 amide inhibited adhesion to laminin during flow by high-density SS RBC from patients with strongly adherent cells but had no effect on adhesion observed after a static phase. Deletion of the cytoplasmic domain of B-CAM as well as mutation of the juxtamembranous tyrosine residue failed to reduce B-CAM-mediated adhesion to laminin by transfected MEL cells. These studies confirm that B-CAM/LU is the most critical receptor mediating adhesion to laminin under both static and flow conditions. Dense SS RBC are most adherent to laminin despite bearing fewer laminin receptors, apparently due to a reversible protein kinase A-dependent process that is unlikely to involve direct phosphorylation of B-CAM/LU. Our results also suggest that the nature of the interaction of B-CAM/LU with laminin may be different under static and flow conditions.
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Affiliation(s)
- Qin Zen
- Division of Hematology, Department of Medicine, Duke University Medical Center and Duke Comprehensive Sickle Cell Center, Durham, North Carolina 27710, USA
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42
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Wandersee NJ, Olson SC, Holzhauer SL, Hoffmann RG, Barker JE, Hillery CA. Increased erythrocyte adhesion in mice and humans with hereditary spherocytosis and hereditary elliptocytosis. Blood 2004; 103:710-6. [PMID: 12947004 DOI: 10.1182/blood-2003-02-0492] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Mice with disruptions of the red blood cell (RBC) cytoskeleton provide severe hemolytic anemia models in which to study multiorgan thrombosis and infarction. The incidence of cerebral infarction ranges from 70% to 100% in mice with alpha-spectrin deficiency. To determine whether mutant RBCs abnormally bind adhesive vascular components, we measured adhesion of mouse and human RBCs to immobilized human thrombospondin (TSP) and laminin (LM) under controlled flow conditions. Mutant RBCs had at least 10-fold higher adhesion to TSP compared with normal RBCs (P <.006). Mutant relative to unaffected RBC adhesion to LM was significantly (P <.01) increased as well. Treatment of RBCs with the anionic polysaccharide dextran sulfate inhibited mutant RBC adhesion to TSP (P <.001). Treatment of RBCs with antibodies to CD47 or the CD47-binding TSP peptide 4N1K did not inhibit TSP adhesion of RBCs. Previously, we have shown that infarcts in alpha-spectrin-deficient sph/sph mice become histologically evident beginning at 6 weeks of age. TSP adhesion of RBCs from 3- to 4- and 6- to 8-week-old sph/sph mice was significantly higher than RBCs from adult mice (> 12 weeks old; P <.005). While the mechanism of infarction in these mice is unknown, we speculate that changes in RBC adhesive characteristics contribute to this pathology.
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Affiliation(s)
- Nancy J Wandersee
- Blood Research Institute, The Blood Center of Southeastern Wisconsin, 8727 Watertown Plank Rd, Milwaukee, WI 53226, USA.
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43
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Garratty G, Telen MJ, Petz LD. Red cell antigens as functional molecules and obstacles to transfusion. HEMATOLOGY. AMERICAN SOCIETY OF HEMATOLOGY. EDUCATION PROGRAM 2003:445-62. [PMID: 12446436 DOI: 10.1182/asheducation-2002.1.445] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Blood group antigens (BGAs) can act as functional molecules but also can evoke autoantibodies and alloantibodies, causing autoimmune hemolytic anemia, hemolytic disease of the newborn and hemolytic transfusion reactions. In Section I, Dr. Marilyn Telen discusses physiologic and pathologic functions of RBC BGA-bearing molecules. She reviews some associations of BGAs with RBC membrane integrity and hemolytic anemia; association of BGAs with enzymatic and transport functions; and adhesion molecules expressed by RBCs, especially with reference to their pathophysiological role in sickle cell disease. In Section II, Dr. Lawrence Petz discusses the problems of providing blood for patients who have RBC autoantibodies. He provides an algorithm for excluding the presence of "hidden" alloantibodies, when all units appear to be incompatible due to the autoantibody. He emphasizes that clinicians should be aware of these approaches and not accept "the least incompatible unit." In Section III, Dr. George Garratty describes two processes, in development, that produce RBCs that result in RBCs that can be described as "universal" donor or "stealth" RBCs. The first process involves changing group A, B, or AB RBCs into group O RBCs by removing the immunospecific sugars responsible for A and B specificity by using specific enzymes. The second process involves covering all BGAs on the RBC surface using polyethylene glycol (PEG). Results of in vitro and in vivo studies on these modified RBCs are discussed.
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Affiliation(s)
- George Garratty
- American Red Cross Blood Services, Southern California Region, Los Angeles, CA 90006, USA
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44
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Hines PC, Zen Q, Burney SN, Shea DA, Ataga KI, Orringer EP, Telen MJ, Parise LV. Novel epinephrine and cyclic AMP-mediated activation of BCAM/Lu-dependent sickle (SS) RBC adhesion. Blood 2003; 101:3281-7. [PMID: 12506027 DOI: 10.1182/blood-2001-12-0289] [Citation(s) in RCA: 118] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The vasoocclusive crisis is the major clinical feature of sickle cell anemia, which is believed to be initiated or sustained by sickle (SS) red blood cell (RBC) adhesion to the vascular wall. SS RBCs, but not unaffected (AA) RBCs, adhere avidly to multiple components of the vascular wall, including laminin. Here we report a novel role for epinephrine and cyclic adenosine monophosphate (cAMP) in the regulation of human SS RBC adhesiveness via the laminin receptor, basal cell adhesion molecule/Lutheran (BCAM/Lu). Our data demonstrate that peripheral SS RBCs contain greater than 4-fold more cAMP than AA RBCs under basal conditions. Forskolin or the stress mediator epinephrine further elevates cAMP in SS RBCs and increases adhesion of SS RBCs to laminin in a protein kinase A (PKA)-dependent manner, with the low-density population being the most responsive. Epinephrine-stimulated adhesion to laminin, mediated primarily via the beta 2-adrenergic receptor, occurred in SS RBC samples from 46% of patients and was blocked by recombinant, soluble BCAM/Lu, implicating this receptor as a target of cAMP signaling. Thus, these studies demonstrate a novel, rapid regulation of SS RBC adhesion by a cAMP-dependent pathway and suggest that components of this pathway, particularly PKA, the beta 2-adrenergic receptor, and BCAM/Lu, should be further explored as potential therapeutic targets to inhibit SS RBC adhesion.
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Affiliation(s)
- Patrick C Hines
- Department of Pharmacology, University of North Carolina at Chapel Hill, 27599, USA
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45
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Kikkawa Y, Virtanen I, Miner JH. Mesangial cells organize the glomerular capillaries by adhering to the G domain of laminin alpha5 in the glomerular basement membrane. J Cell Biol 2003; 161:187-96. [PMID: 12682087 PMCID: PMC2172883 DOI: 10.1083/jcb.200211121] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
In developing glomeruli, laminin alpha5 replaces laminin alpha1 in the glomerular basement membrane (GBM) at the capillary loop stage, a transition required for glomerulogenesis. To investigate domain-specific functions of laminin alpha5 during glomerulogenesis, we produced transgenic mice that express a chimeric laminin composed of laminin alpha5 domains VI through I fused to the human laminin alpha1 globular (G) domain, designated Mr51. Transgene-derived protein accumulated in many basement membranes, including the developing GBM. When bred onto the Lama5 -/- background, Mr51 supported GBM formation, preventing the breakdown that normally occurs in Lama5 -/- glomeruli. In addition, podocytes exhibited their typical arrangement in a single cell layer epithelium adjacent to the GBM, but convolution of glomerular capillaries did not occur. Instead, capillaries were distended and exhibited a ballooned appearance, a phenotype similar to that observed in the total absence of mesangial cells. However, here the phenotype could be attributed to the lack of mesangial cell adhesion to the GBM, suggesting that the G domain of laminin alpha5 is essential for this adhesion. Analysis of an additional chimeric transgene allowed us to narrow the region of the alpha5 G domain essential for mesangial cell adhesion to alpha5LG3-5. Finally, in vitro studies showed that integrin alpha3beta1 and the Lutheran glycoprotein mediate adhesion of mesangial cells to laminin alpha5. Our results elucidate a mechanism whereby mesangial cells organize the glomerular capillaries by adhering to the G domain of laminin alpha5 in the GBM.
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Affiliation(s)
- Yamato Kikkawa
- Department of Internal Medicine, Washington University School of Medicine, St Louis, MO 63110, USA
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Lee G, Spring FA, Parsons SF, Mankelow TJ, Peters LL, Koury MJ, Mohandas N, Anstee DJ, Chasis JA. Novel secreted isoform of adhesion molecule ICAM-4: potential regulator of membrane-associated ICAM-4 interactions. Blood 2003; 101:1790-7. [PMID: 12406883 DOI: 10.1182/blood-2002-08-2529] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Intercellular adhesion molecule-4 (ICAM-4), a newly characterized adhesion molecule, is expressed early in human erythropoiesis and functions as a ligand for binding alpha4beta1 and alphaV integrin-expressing cells. Within the bone marrow, erythroblasts surround central macrophages forming erythroblastic islands. Evidence suggests that these islands are highly specialized subcompartments where cell adhesion events, in concert with cytokines, play critical roles in regulating erythropoiesis and apoptosis. Since erythroblasts express alpha4beta1 and ICAM-4 and macrophages exhibit alphaV, ICAM-4 is an attractive candidate for mediating cellular interactions within erythroblastic islands. To determine whether ICAM-4 binding properties are conserved across species, we first cloned and sequenced the murine homologue. The translated amino acid sequence showed 68% overall identity with human ICAM-4. Using recombinant murine ICAM-4 extracellular domains, we discovered that hematopoietic alpha4beta1- expressing HEL cells and nonhematopoietic alphaV-expressing FLY cells adhered to mouse ICAM-4. Cell adhesion studies showed that FLY and HEL cells bound to mouse and human proteins with similar avidity. These data strongly suggest conservation of integrin-binding properties across species. Importantly, we characterized a novel second splice cDNA that would be predicted to encode an ICAM-4 isoform, lacking the membrane-spanning domain. Erythroblasts express both isoforms of ICAM-4. COS-7 cells transfected with green flourescent protein constructs of prototypic or novel ICAM-4 cDNA showed different cellular localization patterns. Moreover, analysis of tissue culture medium revealed that the novel ICAM-4 cDNA encodes a secreted protein. We postulate that secretion of this newly described isoform, ICAM-4S, may modulate binding of membrane-associated ICAM-4 and could thus play a critical regulatory role in erythroblast molecular attachments.
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Affiliation(s)
- Gloria Lee
- Life Sciences Division, University of California, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
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Kikkawa Y, Moulson CL, Virtanen I, Miner JH. Identification of the Binding Site for the Lutheran Blood Group Glycoprotein on Laminin α5 through Expression of Chimeric Laminin Chains in Vivo. J Biol Chem 2002; 277:44864-9. [PMID: 12244066 DOI: 10.1074/jbc.m208731200] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The Lutheran blood group glycoprotein (Lu), also known as basal cell adhesion molecule, is an Ig superfamily transmembrane receptor for laminin alpha5. Lu is expressed on the surface of a subset of muscle and epithelial cells in diverse tissues and is thought to be involved in both normal and disease processes, including sickle cell disease and cancer. Here we investigated the binding of Lu to laminin alpha5 in vivo and in vitro. We prepared a soluble recombinant Lu (sol-Lu) composed of the Lu extracellular domain and a His(6) tag. Sol-Lu bound specifically to laminin-10/11 (alpha5beta1/beta2gamma1) in enzyme-linked immunosorbent assays and bound to bona fide basement membranes containing laminin alpha5 in tissue sections. Sol-Lu did not bind to tissue sections of laminin alpha5 knockout embryos, despite the fact that the four other alpha chains were present. To identify the Lu-binding site on laminin alpha5, we prepared modified alpha5 cDNAs encoding chimeric laminins containing all or part of the laminin alpha1 G domain in place of the analogous alpha5 regions. These constructs were used to generate transgenic mice. Proteins derived from transgenes were detected in basement membranes and were assayed for their ability to bind Lu by examining the localization of endogenous Lu and the binding of sol-Lu applied to tissue sections. Our results demonstrate that the alpha5 LG3 module is essential for Lu binding to laminin alpha5.
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Affiliation(s)
- Yamato Kikkawa
- Renal Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, Missouri 63110, USA
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Affiliation(s)
- Geoff Daniels
- Bristol Institute for Transfusion Sciences, Bristol, UK.
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Swart GWM. Activated leukocyte cell adhesion molecule (CD166/ALCAM): developmental and mechanistic aspects of cell clustering and cell migration. Eur J Cell Biol 2002; 81:313-21. [PMID: 12113472 DOI: 10.1078/0171-9335-00256] [Citation(s) in RCA: 186] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Activated leukocyte cell adhesion molecule (ALCAM/CD166) is a member of the immunoglobulin superfamily and belongs to a recent subgroup with five extracellular immunoglobulin-like domains (VVC2C2C2). ALCAM mediates both heterophilic (ALCAM-CD6) and homophilic (ALCAM-ALCAM) cell-cell interactions. While expressed in a wide variety of tissues, ALCAM is usually restricted to subsets of cells involved in dynamic growth and/or migration, including neural development, branching organ development, hematopoiesis, immune response and tumor progression. Recent structure-function analyses of ALCAM hint at how its cytoskeletal anchoring and the integrity of the extracellular immunoglobulin-like domains may regulate complex cellular properties in regard to cell adhesion, growth and migration. Accumulating evidence suggests that ALCAM expression may reflect the onset of a cellular program for homeostatic control of growth saturation, which induces either growth arrest or cell migration when the upper limits are exceeded.
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Affiliation(s)
- Guido W M Swart
- Department of Biochemistry, University of Nijmegen, The Netherlands.
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Shusta EV, Boado RJ, Pardridge WM. Vascular proteomics and subtractive antibody expression cloning. Mol Cell Proteomics 2002; 1:75-82. [PMID: 12096143 DOI: 10.1074/mcp.t100008-mcp200] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The cloning of genes expressing proteins that are differentially expressed in the organ microvasculature has the potential to address a variety of problems ranging from the analysis of disease pathogenesis to drug targeting for particular tissues. This study describes a methodology designed to analyze differential protein expression in the brain microvasculature. The method can be applied to other organs and is particularly suited to the cloning of cDNAs encoding membrane proteins. The technology merges a tissue-specific polyclonal antiserum with a cDNA library expression cloning system. The tissue-specific antiserum is subtracted with protein extracts from control tissues to remove those antibodies that recognize common antigenic proteins. Then, the depleted antiserum is used to expression clone tissue-specific proteins from a cDNA library expressed in mammalian cells. The methodology was evaluated with a rabbit polyclonal antiserum prepared against purified bovine brain capillaries. The antiserum was absorbed with acetone powders of liver and kidney and then used to screen a bovine brain capillary cDNA library in COS cells. The initial clone detected with this expression methodology was the Lutheran membrane glycoprotein, which is specifically expressed at the brain microvasculature compared with liver and kidney tissues. This subtractive expression cloning methodology provides a new approach to "vascular proteomics" and to the detection of proteins specifically expressed at the microvasculature, including membrane proteins.
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Affiliation(s)
- Eric V Shusta
- Department of Medicine, UCLA School of Medicine, Los Angeles, California 90024, USA
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