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Murray CE, O’Brien C, Alamin S, Phelan SH, Argue R, Kiersey R, Gardiner M, Naughton A, Keogh E, Holmes P, Naughton S, Scanlon A, Sloan A, McCrea P, Sui J, Dunne J, Conlon N. Cellular and humoral immunogenicity of the COVID-19 vaccine and COVID-19 disease severity in individuals with immunodeficiency. Front Immunol 2023; 14:1131604. [PMID: 37033955 PMCID: PMC10080028 DOI: 10.3389/fimmu.2023.1131604] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Accepted: 03/06/2023] [Indexed: 04/11/2023] Open
Abstract
Background A well-coordinated adaptive immune response is crucial for limiting COVID-19 disease. Some individuals with immunodeficiency are at a high risk of developing severe COVID-19. Therefore, the development of standardized methods for measuring different arms of the vaccine response in the setting of immunodeficiency is of particular interest. In this study, we compared the vaccine response of individuals living with immunodeficiency with healthy controls in terms of interferon gamma (IFN-γ) production and spike protein-specific antibody level post primary COVID-19 vaccination and booster vaccines. Additionally, the disease severity of those individuals who contracted COVID-19 was assessed. Methods Whole blood was stimulated overnight from 71 participants and 99 healthy controls. Commercially available PepTivator® peptide pool and trimeric spike protein stimulation were used. ELISA was used to analyze IFN-γ levels. The total SARS-CoV-2 spike protein antibody titre was measured using a Roche Elecsys® S total antibody assay. Patient characteristics, COVID-19 infection status and IDDA 2.1 'Kaleidoscope' scores were recorded. Vaccine responses were scored from zero to three. Results 99% of healthy controls, 89% of individuals with IEI and 76% with secondary immunodeficiency (SID) had an IFN-γ level above the validated reference range after peptide mix stimulation following primary vaccination. There was an increase in IFN-γ levels in patients with inborn errors of immunity (IEI) following the booster vaccine (p = 0.0156). 100% of healthy controls, 70% of individuals living with IEI and 64% of individuals living with SID had detectable spike protein-specific antibody levels following the primary vaccination. 55% of immunodeficiency patients who had mild COVID-19 and 10% with moderate/severe COVID-19 had detectable antibody and IFN-γ levels post vaccine. The mean pre-infection IDDA 2.1 scores were higher in individuals who developed moderate/severe COVID-19 (25.2 compared to 9.41). Conclusions Covid whole-blood IGRA is a highly accurate, straightforward and robust assay and can be easily adapted to measure cellular response to COVID-19. A complete evaluation of the vaccine response may be particularly important for individuals living with immunodeficiency. A clinical immunodeficiency score and a validated vaccine response score may be valuable tools in estimating COVID-19 disease risk and identifying individuals living with immunodeficiency who may benefit from enhanced vaccination schedules.
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Affiliation(s)
- C. E. Murray
- Department of Immunology, St. James’s Hospital, Dublin, Ireland
- *Correspondence: C. E. Murray,
| | - C. O’Brien
- Department of Immunology, St. James’s Hospital, Dublin, Ireland
| | - S. Alamin
- Department of Immunology, St. James’s Hospital, Dublin, Ireland
| | - S. H. Phelan
- Department of Immunology, St. James’s Hospital, Dublin, Ireland
| | - R. Argue
- Department of Immunology, St. James’s Hospital, Dublin, Ireland
- Wellcome Trust Clinical Research Facility, St. James's Hospital, Dublin, Ireland
| | - R. Kiersey
- Department of Immunology, St. James’s Hospital, Dublin, Ireland
| | - M. Gardiner
- Department of Immunology, St. James’s Hospital, Dublin, Ireland
| | - A. Naughton
- Department of Immunology, St. James’s Hospital, Dublin, Ireland
| | - E. Keogh
- Department of Biochemistry, St. James’s Hospital, Dublin, Ireland
| | - P. Holmes
- Department of Biochemistry, St. James’s Hospital, Dublin, Ireland
| | - S. Naughton
- Department of Biochemistry, St. James’s Hospital, Dublin, Ireland
| | - A. Scanlon
- Department of Biochemistry, St. James’s Hospital, Dublin, Ireland
| | - A. Sloan
- Department of Immunology, St. James’s Hospital, Dublin, Ireland
| | - P. McCrea
- Department of Immunology, St. James’s Hospital, Dublin, Ireland
| | - J. Sui
- Department of Immunology, St. James’s Hospital, Dublin, Ireland
- STTAR Bioresource, St. James’s Hospital, Dublin, Ireland
| | - J. Dunne
- Department of Immunology, St. James’s Hospital, Dublin, Ireland
| | - N. Conlon
- Department of Immunology, St. James’s Hospital, Dublin, Ireland
- Wellcome Trust Clinical Research Facility, St. James's Hospital, Dublin, Ireland
- STTAR Bioresource, St. James’s Hospital, Dublin, Ireland
- School of Medicine, Trinity College Dublin, Dublin, Ireland
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McCrea P. John Daniel McCrea. Assoc Med J 2014. [DOI: 10.1136/bmj.g3799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Tran HT, Delvaeye M, Verschuere V, Descamps E, Crabbe E, Van Hoorebeke L, McCrea P, Adriaens D, Van Roy F, Vleminckx K. ARVCF depletion cooperates with Tbx1 deficiency in the development of 22q11.2DS-like phenotypes in Xenopus. Dev Dyn 2011; 240:2680-7. [PMID: 22028109 DOI: 10.1002/dvdy.22765] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/21/2011] [Indexed: 12/19/2022] Open
Abstract
The 22q11.2 deletion syndrome is a common dominant genetic disorder characterized by a heterozygous deletion of a cluster of genes on chromosome 22q11.2. TBX1, a transcription factor belonging to the T-box gene family, is a key player in the syndrome. However, heterozygosity of Tbx1 in mouse models does not fully recapitulate the phenotypes characteristic of the disease, which may point to the involvement of other genes in the deleted chromosomal region. Hence, we investigated the contribution of the catenin ARVCF, another gene that is deleted in 22q11.2DS. During Xenopus development, ARVCF mRNA is expressed in the pharyngeal arches and depleting either ARVCF or Tbx1 results in delayed migration of the cranial neural crest cells and in defects in the craniofacial skeleton and aortic arches. Moreover, double depletion of ARVCF and Tbx1 revealed that they act cooperatively, indicating that decreased ARVCF levels may also contribute to 22q11.2DS-associated phenotypes.
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Affiliation(s)
- Hong Thi Tran
- Department for Molecular Biomedical Research, VIB & Ghent University, Ghent, Belgium
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Munoz W, Cho K, Lee M, Ji H, Vleminckx K, Kloc M, McCrea P. Role of Plakophilin-3, a desmosomal catenin, in Xenopus laevis development. Dev Biol 2011. [DOI: 10.1016/j.ydbio.2011.05.551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Abstract
AIMS Our aim was to validate three diabetes case definitions for children and adolescents aged <20 years in Canada using administrative and clinical data in the province of British Columbia. METHODS We identified potential cases of diabetes from physician claims, hospitalizations and prescription drug records between 1992/1993 and 2007/2008 using the three different case definitions, which included a national standard as well as two regionally developed case definitions. Each case definition used a different combination of administrative data; however, only one definition used prescription drug records. The sensitivity of each definition was calculated against the 'gold standard' of diagnosed cases recorded in British Columbia's Children's Hospital Endocrinology and Diabetes Unit clinical database. RESULTS During this time period, 2611 patients were seen at the British Columbia's Children's Hospital. The sensitivities (95% CIs) of the national and two regional case definitions were 0.95 (0.941-0.958), 0.97 (0.964-0.977) and 0.82 (0.800-0.830), respectively. CONCLUSIONS Our results highlight the benefit of regional case definitions that exploit the availability of different data sources, but also support that a nationally derived definition is sensitive among children and adolescents.
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Affiliation(s)
- S Amed
- Department of Pediatrics, University of British Columbia BC Children's Hospital, Vancouver, BC, Canada.
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Crockard AD, Alexander HD, Stephenson CF, McCrea P, Desai ZR, Morris TCM, McNeill TA. An Analysis of Circulating CD4 Lymphocyte Subpopulations in B-Cell Chronic Lymphocytic Leukaemia. Leuk Lymphoma 2009; 3:127-33. [DOI: 10.3109/10428199009050986] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Atwood K, Reimer K, McCrea P, Fisk B, McDonald K, Smith R, Mercer R, DesMeules M, Luo W, Dressier" M, Gibbons L. Lifestyle and environmental risk factors associated with progression of diabetes in british columbia, canada. Can J Diabetes 2009. [DOI: 10.1016/s1499-2671(09)33309-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ciesiolka M, Delvaeye M, Van Imschoot G, Verschuere V, McCrea P, van Roy F, Vleminckx K. p120 catenin is required for morphogenetic movements involved in the formation of the eyes and the craniofacial skeleton in Xenopus. J Cell Sci 2004; 117:4325-39. [PMID: 15292404 DOI: 10.1242/jcs.01298] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
During Xenopus development, p120 transcripts are enriched in highly morphogenetic tissues. We addressed the developmental function of p120 by knockdown experiments and by expressing E-cadherin mutants unable to bind p120. This resulted in defective eye formation and provoked malformations in the craniofacial cartilage structures, derivatives of the cranial neural crest cells. Closer inspection showed that p120 depletion impaired evagination of the optic vesicles and migration of cranial neural crest cells from the neural tube into the branchial arches. These morphogenetic processes were also affected by p120-uncoupled cadherins or E-cadherin containing a deletion of the juxtamembrane domain. Irrespective of the manipulation that caused the malformations, coexpression of dominant-negative forms of either Rac1 or LIM kinase rescued the phenotypes. Wild-type RhoA and constitutively active Rho kinase caused partial rescue. Our results indicate that, in contrast to invertebrates, p120 is an essential factor for vertebrate development and an adequate balance between cadherin activity and cytoskeletal condition is critical for correct morphogenetic movements.
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Affiliation(s)
- Malgorzata Ciesiolka
- Developmental Biology Unit, Department of Molecular Biomedical Research, Flanders Interuniversity Institute for Biotechnology (VIB)-Ghent University, Technologiepark 927, B-9052 Ghent, Belgium
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McCrea P. The Health Effects of Chrysotile Asbestos. By R. P. Nolan et al. Published by Mineralogical Association of Canada, 2001. ISBN: 0-921294-41-7. 304 pp. $38.00. Occup Med (Lond) 2003. [DOI: 10.1093/occmed/kqg092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Shonukan O, Bagayogo I, McCrea P, Chao M, Hempstead B. Neurotrophin-induced melanoma cell migration is mediated through the actin-bundling protein fascin. Oncogene 2003; 22:3616-23. [PMID: 12789270 DOI: 10.1038/sj.onc.1206561] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Expression of the p75 neurotrophin receptor (p75(NTR)) in primary melanomas is associated with deeply invasive lesions. In turn, there is expression of high levels of neurotrophins at the invasion front of normal tissue adjacent to brain metastases, thus implicating this growth factor-receptor system in melanoma tumorigenesis. The neurotrophins nerve growth factor (NGF) and neurotrophin-3 (NT-3) are potent chemotactic agents for human melanoma cells which express p75(NTR)in vitro. Here we show that the actin-bundling protein fascin specifically interacts with p75(NTR) in an NGF-dependent manner by co-immunoprecipitation and colocalization in melanoma cells that express the two proteins endogenously. In addition, expression of a fascin point mutant at the serine phosphorylation site (serine 39) regulating actin binding abrogates neurotrophin-induced migration. These results suggest a causal role for NGF-mediated dephosphorylation of serine 39 on fascin in mediating actin binding and subsequent melanoma cell migration.
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Affiliation(s)
- Oluwatoyin Shonukan
- Department of Medicine, Division of Hematology/Oncology, University of Miami School of Medicine, Miami, FL 33136, USA.
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Adam L, Vadlamudi RK, McCrea P, Kumar R. Tiam1 overexpression potentiates heregulin-induced lymphoid enhancer factor-1/beta -catenin nuclear signaling in breast cancer cells by modulating the intercellular stability. J Biol Chem 2001; 276:28443-50. [PMID: 11328805 DOI: 10.1074/jbc.m009769200] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Heregulin-beta1 (HRG) promotes motility, scattering, and invasiveness of breast cancer cells. Tiam1, a newly identified guanine nucleotide exchange factor, has been shown to inhibit or promote cell migration in a cell type-dependent manner. In this study, we identified Tiam1 as a target of HRG signaling. HRG stimulation of breast cancer epithelial cells induced the phosphorylation and redistribution of Tiam1 to the membrane ruffles and the loosening of intercellular junctions. In addition, HRG-mediated scattering of breast epithelial cells was accompanied by stimulation of tyrosine phosphorylation and redistribution of beta-catenin from the cell junctions to the cytosol and, finally, entry into the nucleus. Decompaction of breast cancer epithelial cells by HRG was accompanied by a transient physical association of the tyrosine-phosphorylated beta-catenin with the activated human epidermal growth factor receptor 2 and subsequent nuclear translocation of beta-catenin, as well as beta-catenin-dependent transactivation of T-cell factor.lymphoid enhancer factor-1. All of these HRG-induced phenotypic changes were regulated in a phosphatidylinositol-3 kinase-sensitive manner. HRG-induced cellular ruffles, loss of intercellular adhesiveness, and increased cell migration could be mimicked by overexpression of a fully functional Tiam1 construct. Furthermore, ectopic expression of Tiam1 or of an active beta-catenin mutant led to potentiation of the beta-catenin-dependent T-cell factor.lymphoid enhancer factor-1 transactivation and invasiveness of HRG-treated cells. We also found preliminary evidence suggesting a close correlation between the status of Tiam1 expression and invasiveness of human breast tumor cells with the degree of progression of breast tumors. Together, these findings suggest that HRG regulate Tiam1 activation and lymphoid enhancer factor/beta-catenin nuclear signaling via phosphatidylinositol-3 kinase in breast cancer cells.
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Affiliation(s)
- L Adam
- University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, USA
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McGibney C, Holmberg O, McClean B, Williams C, McCrea P, Sutton P, Armstrong J. Dose escalation of chart in non-small cell lung cancer: is three-dimensional conformal radiation therapy really necessary? Int J Radiat Oncol Biol Phys 1999; 45:339-50. [PMID: 10487554 DOI: 10.1016/s0360-3016(99)00095-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
PURPOSE To evaluate, preclinically, the potential for dose escalation of continuous, hyperfractionated, accelerated radiation therapy (CHART) for non small-cell lung cancer (NSCLC), we examined the strategy of omission of elective nodal irradiation with and without the application of three-dimensional conformal radiation technology (3DCRT). METHODS AND MATERIALS 2D, conventional therapy plans were designed according to the specifications of CHART for 18 patients with NSCLC (Stages Ib, IIb, IIIa, and IIIb). Further plans were generated with the omission of elective nodal irradiation (ENI) from the treatment portals (2D minus ENI plans [2D-ENI plans]). Both sets were inserted in the patient's planning computed tomographies (CTs). These reconstructed plans were then compared to alternative, three-dimensional treatment plans which had been generated de novo, with the omission of ENI: 3D minus elective nodal irradiation (3D-ENI plans). Dose delivery to the planning target volumes (PTVs) and to the organs at risk were compared between the 3 sets of corresponding plans. The potential for dose escalation of each patient's 2D-ENI and 3D-ENI plan beyond 54 Gy, standard to CHART, was also determined. RESULTS PTV coverage was suboptimal in the 2D CHART and the 2D-ENI plans. Only in the 3D-ENI plans did 100% of the PTV get > or = 95% of the dose prescribed (i.e., 51.5 Gy [51.3-52.2]). Using 3D-ENI plans significantly reduced the dose received by the spinal cord, the mean and median doses to the esophagus and the heart. It did not significantly reduce the lung dose when compared to 2D-ENI plans. Escalation of the dose (minimum > or = 1 Gy) with optimal PTV coverage was possible in 55.5% of patients using 3D-ENI, but was possible only in 16.6% when using the 2D-ENI planning strategy. CONCLUSIONS 3DCRT is fundamental to achieving optimal PTV coverage in NSCLC. A policy of omission of elective nodal irradiation alone (and using 2D technology) will not achieve optimal PTV coverage or dose escalation. 3DCRT with omission of ENI can achieve true escalation of CHART in 55.5% of tumors, depending on their site and N-stage.
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Affiliation(s)
- C McGibney
- Department of Radiation Oncology, St. Luke's Hospital, Dublin, Ireland.
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Abstract
We describe a case of a 28 year old brewery worker who developed asthma whilst grinding malt. Lung function measurements demonstrated deterioration and improvement in lung function associated with work and absence from work. Inhalation challenge with ground malt from the brewery was positive but with ground malt from another source was negative suggesting a contaminant of the malt was responsible. Culture of the brewery malt showed heavy contamination with Aspergillus niger, but A. niger skin test was negative and aspergillus-specific IgG was not detected in the patients serum. Removal of the subject from the grinding room resulted in resolution of symptoms and normal lung function. We discuss the role of A. niger as an aetiological agent for occupational asthma with reference to the above case.
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Affiliation(s)
- L G Heaney
- Department of Respiratory Medicine, Belfast City Hospital, Northern Ireland
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McGibney C, Holmberg O, McClean B, Williams C, Buckney S, Jones E, McCrea P, Sutton P, Armstrong J. 486 The potential impact of 3-D conformal radiotherapy (3DCRT) on continuous hyperfractionated accelerated radiotherapy (CHART) for NSCLC. Lung Cancer 1997. [DOI: 10.1016/s0169-5002(97)89866-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Funayama N, Fagotto F, McCrea P, Gumbiner BM. Embryonic axis induction by the armadillo repeat domain of beta-catenin: evidence for intracellular signaling. J Cell Biol 1995; 128:959-68. [PMID: 7876319 PMCID: PMC2120405 DOI: 10.1083/jcb.128.5.959] [Citation(s) in RCA: 453] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
beta-catenin was identified as a cytoplasmic cadherin-associated protein required for cadherin adhesive function (Nagafuchi, A., and M. Takeichi. 1989. Cell Regul. 1:37-44; Ozawa, M., H. Baribault, and R. Kemler. 1989. EMBO [Eur. Mol. Biol. Organ.] J. 8:1711-1717). Subsequently, it was found to be the vertebrate homologue of the Drosophila segment polarity gene product Armadillo (McCrea, P. D., C. W. Turck, and B. Gumbiner. 1991. Science [Wash. DC]. 254:1359-1361; Peifer, M., and E. Wieschaus. 1990. Cell. 63:1167-1178). Also, antibody perturbation experiments implicated beta-catenin in axial patterning of the early Xenopus embryo (McCrea, P. D., W. M. Brieher, and B. M. Gumbiner. 1993. J. Cell Biol. 123:477-484). Here we report that overexpression of beta-catenin in the ventral side of the early Xenopus embryo, by injection of synthetic beta-catenin mRNA, induces the formation of a complete secondary body axis. Furthermore, an analysis of beta-catenin deletion constructs demonstrates that the internal armadillo repeat region is both necessary and sufficient to induce axis duplication. This region interacts with C-cadherin and with the APC tumor suppressor protein, but not with alpha-catenin, that requires the amino-terminal region of beta-catenin to bind to the complex. Since alpha-catenin is required for cadherin-mediated adhesion, the armadillo repeat region alone probably cannot promote cell adhesion, making it unlikely that beta-catenin induces axis duplication by increasing cell adhesion. We propose, rather, that beta-catenin acts in this circumstance as an intracellular signaling molecule. Subcellular fractionation demonstrated that all of the beta-catenin constructs that contain the armadillo repeat domain were present in both the soluble cytosolic and the membrane fraction. Immunofluorescence staining confirmed the plasma membrane and cytoplasmic localization of the constructs containing the armadillo repeat region, but revealed that they also accumulate in the nucleus, especially the construct containing only the armadillo repeat domain. These findings and the beta-catenin protein interaction data offer several intriguing possibilities for the site of action or the protein targets of beta-catenin signaling activity.
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Affiliation(s)
- N Funayama
- Cellular Biochemistry and Biophysics Program, Memorial Sloan-Kettering Cancer Center, New York 10021
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Heasman J, Crawford A, Goldstone K, Garner-Hamrick P, Gumbiner B, McCrea P, Kintner C, Noro CY, Wylie C. Overexpression of cadherins and underexpression of beta-catenin inhibit dorsal mesoderm induction in early Xenopus embryos. Cell 1994; 79:791-803. [PMID: 7528101 DOI: 10.1016/0092-8674(94)90069-8] [Citation(s) in RCA: 537] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The cadherin-catenin complex has an important role in cell-cell adhesion and may also function in signaling pathways. We report that overexpression of three cadherin types in Xenopus embryos causes them to develop with reduced dorsal axial structures. The same phenotype is produced in embryos that have been depleted of maternal beta-catenin protein by an antisense oligodeoxynucleotide complementary to beta-catenin mRNA. They show an inhibition in the expression of dorsal mesodermal markers MyoD and goosecoid, but not of ventral and general mesodermal markers. They lack notochords, somites, and neural tubes and are defective in dorsal mesodermal signaling in Nieuwkoop assays. The phenotype can be rescued by the injection of beta-catenin mRNA and not by the injection of Xwnt-8 mRNA. These results show that beta-catenin has an important role in dorsal mesoderm induction. They directly demonstrate the activity of a maternal mRNA in axis specification.
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Affiliation(s)
- J Heasman
- Institute of Human Genetics, University of Minnesota, Minneapolis 55455
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Choi YS, Sehgal R, McCrea P, Gumbiner B. A cadherin-like protein in eggs and cleaving embryos of Xenopus laevis is expressed in oocytes in response to progesterone. J Biophys Biochem Cytol 1990; 110:1575-82. [PMID: 2335564 PMCID: PMC2200174 DOI: 10.1083/jcb.110.5.1575] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
A new cadherin-like protein (CLP) was identified in oocytes, eggs, and cleavage stage embryos of Xenopus laevis. As a probe for detecting new cadherin proteins, an antiserum was raised to a 17 amino acid peptide derived from a highly conserved region in the cytoplasmic domain of all cadherins which have been sequenced to date. This antipeptide antibody recognized Xenopus E-cadherin and a polypeptide in Xenopus brain extracts similar to N-cadherin, which were independently identified by specific mAbs. In extracts of eggs and midblastula stage embryos the antipeptide antibody recognized specifically a 120-kD glycoprotein that migrated faster on SDS gels than the 140-kD E- and N-cadherin polypeptides. This 120-kD polypeptide was not recognized by the mAbs specific to E- and N-cadherin. In fact, E- and N-cadherin were not detectable in eggs or midblastula stage embryos. The possible relationship of CLP to P-cadherin, which has been identified in mouse tissues, has not yet been determined. CLP was synthesized by large, late stage oocytes. When oocytes were induced to mature in vitro with progesterone it accumulated to the same level found in normally laid eggs. It did not accumulate further to any significant extent during the early cleavage stages. CLP was detected on the surface of stage 8 blastomeres by cell surface biotinylation, but only after the tight junctions of the blastula epithelium were opened by removal of Ca2+. We conclude that CLP is a maternally encoded protein that is the major, if not only, cadherin-related protein present in the earliest stages of Xenopus development, and we propose that it may play a role in the Ca2(+)-dependent adhesion and junction formation between cleavage stage blastomeres.
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Affiliation(s)
- Y S Choi
- Department of Pharmacology, University of California, San Francisco 94143
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