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Jané P, Xu X, Taelman V, Jané E, Gariani K, Dumont RA, Garama Y, Kim F, Del Val Gomez M, Walter MA. The Imageable Genome. Nat Commun 2023; 14:7329. [PMID: 37957176 PMCID: PMC10643363 DOI: 10.1038/s41467-023-43123-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 11/01/2023] [Indexed: 11/15/2023] Open
Abstract
Understanding human disease on a molecular level, and translating this understanding into targeted diagnostics and therapies are central tenets of molecular medicine1. Realizing this doctrine requires an efficient adaptation of molecular discoveries into the clinic. We present an approach to facilitate this process by describing the Imageable Genome, the part of the human genome whose expression can be assessed via molecular imaging. Using a deep learning-based hybrid human-AI pipeline, we bridge individual genes and their relevance in human diseases with specific molecular imaging methods. Cross-referencing the Imageable Genome with RNA-seq data from over 60,000 individuals reveals diagnostic, prognostic and predictive imageable genes for a wide variety of major human diseases. Having both the critical size and focus to be altered in its expression during the development and progression of any human disease, the Imageable Genome will generate new imaging tools that improve the understanding, diagnosis and management of human diseases.
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Affiliation(s)
- Pablo Jané
- University of Geneva, Geneva, Switzerland
- Nuclear Medicine and Molecular Imaging Division, Geneva University Hospitals, Geneva, Switzerland
| | | | | | - Eduardo Jané
- Departamento de Matemática Aplicada a la Ingeniería Aeroespacial - ETSIAE, Universidad Politécnica de Madrid, 28040, Madrid, Spain
| | - Karim Gariani
- Division of Endocrinology, Diabetes, Nutrition and Patient Therapeutic Education, Geneva University Hospitals, Geneva, Switzerland
| | | | | | | | - María Del Val Gomez
- Servicio de Medicina Nuclear, Hospital Universitario Ramón y Cajal, Madrid, Spain
| | - Martin A Walter
- University of Lucerne, Lucerne, Switzerland.
- St. Anna Hospital, University of Lucerne, Lucerne, Switzerland.
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Bertrand D, Stouten V, De Cock D, Pazmino S, Doumen M, de Wergifosse I, Joly J, Badot V, Corluy L, Hoffman I, Taelman V, De Knop K, Geens E, Langenaken C, Lenaerts JL, Lenaerts J, Walschot M, Mannaerts J, Westhovens R, Verschueren P. Tapering of Etanercept is feasible in patients with Rheumatoid Arthritis in sustained remission: a pragmatic randomized controlled trial. Scand J Rheumatol 2021; 51:470-480. [PMID: 34514929 DOI: 10.1080/03009742.2021.1955467] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Objective: In patients with rheumatoid arthritis (RA) in sustained remission, tapering of biological disease-modifying anti-rheumatic drugs can be considered. Tapering has already been investigated, but its feasibility remains to be determined. Therefore, we explored the feasibility of tapering etanercept in RA in a setting close to practice.Method: Patients with RA in 28-joint Disease Activity Score (DAS28) remission (≥ 6 months) and treated with etanercept 50 mg weekly (≥ 1 year) were included in the pragmatic 1 year open-label multicentre randomized controlled TapERA (Tapering Etanercept in Rheumatoid Arthritis) trial. Patients were assigned to continue etanercept weekly or to taper to every other week (EOW). Patients who lost remission [DAS28-C-reactive protein (CRP) ≥ 2.6] were re-escalated to etanercept weekly. The primary outcome was the proportion of patients maintaining DAS28-CRP remission for 6 months.Results: Sixty-six patients were randomized to etanercept weekly (n = 34) or EOW (n = 32). After 6 months, 26/34 patients (76%) in the weekly and 19/32 (59%) in the EOW group maintained disease control (p = 0.136). In the EOW group, 20/32 patients (63%) remained on their tapered treatment during the trial. Two patients reintroduced weekly etanercept themselves. Ten patients were re-escalated to etanercept weekly by the rheumatologist, after a median (interquartile range) interval of 3.0 (2.0-6.0) months. Among these patients, 7/10 regained remission after re-escalation, four of them at the next study visit.Conclusions: Although non-inferiority could not be demonstrated, tapering of etanercept to EOW appeared feasible in patients in sustained remission.
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Affiliation(s)
- D Bertrand
- Skeletal Biology and Engineering Research Center, KU Leuven Department of Development and Regeneration, Leuven, Belgium
| | - V Stouten
- Skeletal Biology and Engineering Research Center, KU Leuven Department of Development and Regeneration, Leuven, Belgium
| | - D De Cock
- Skeletal Biology and Engineering Research Center, KU Leuven Department of Development and Regeneration, Leuven, Belgium
| | - S Pazmino
- Skeletal Biology and Engineering Research Center, KU Leuven Department of Development and Regeneration, Leuven, Belgium
| | - M Doumen
- Skeletal Biology and Engineering Research Center, KU Leuven Department of Development and Regeneration, Leuven, Belgium.,Rheumatology, University Hospitals Leuven, Leuven, Belgium
| | | | - J Joly
- Rheumatology, University Hospitals Leuven, Leuven, Belgium
| | - V Badot
- Rheumatology, CHU Brugmann, Brussels, Belgium
| | - L Corluy
- Rheumatology, AZ Herentals, Herentals, Belgium
| | - I Hoffman
- Rheumatology, GZA Sint-Augustinus Antwerpen, Antwerpen, Belgium
| | - V Taelman
- Rheumatology, Heilig Hart Ziekenhuis Leuven, Leuven, Belgium
| | - K De Knop
- Rheumatology, GZA Sint-Augustinus Antwerpen, Antwerpen, Belgium
| | - E Geens
- Rheumatology, ZNA Jan Palfijn Antwerpen, Antwerpen, Belgium
| | | | | | - J Lenaerts
- Rheumatology, University Hospitals Leuven, Leuven, Belgium
| | | | - J Mannaerts
- Skeletal Biology and Engineering Research Center, KU Leuven Department of Development and Regeneration, Leuven, Belgium
| | - R Westhovens
- Skeletal Biology and Engineering Research Center, KU Leuven Department of Development and Regeneration, Leuven, Belgium.,Rheumatology, University Hospitals Leuven, Leuven, Belgium
| | - P Verschueren
- Skeletal Biology and Engineering Research Center, KU Leuven Department of Development and Regeneration, Leuven, Belgium.,Rheumatology, University Hospitals Leuven, Leuven, Belgium
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ElMokh O, Taelman V, Radojewski P, Roelli MA, Stoss A, Dumont RA, Dettmer MS, Phillips WA, Walter MA, Charles RP. MEK Inhibition Induces Therapeutic Iodine Uptake in a Murine Model of Anaplastic Thyroid Cancer. J Nucl Med 2018; 60:917-923. [PMID: 30464041 DOI: 10.2967/jnumed.118.216721] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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: 06/27/2018] [Accepted: 11/15/2018] [Indexed: 12/19/2022] Open
Abstract
Anaplastic thyroid carcinoma (ATC) is refractory to radioiodine therapy in part because of impaired iodine metabolism. We targeted the mitogen-activated protein kinase and phosphatidylinositol 3-kinase (PI3'K) pathways with the intent to induce radioiodine uptake for radioiodine treatment of ATC. Methods: Human ATC cells were used to evaluate the ability of pharmacologic inhibition of the mitogen-activated protein kinase and PI3'K pathways to induce radioiodine uptake. Thyrocyte-specific double-mutant BRAFV600E PIK3CAH1047R mice were treated with a MEK inhibitor followed by radioiodine treatment, and tumor burden was monitored by ultrasound imaging. Results: ATC cell lines showed an increase in sodium-iodine symporter transcription when treated with a MEK or BRAFV600E inhibitor alone and in combination with PI3'K inhibitor. This translated into a dose-dependent elevation of iodine uptake after treatment with a MEK inhibitor alone and in combination with a PI3'K inhibitor. In vivo, MEK inhibition but not BRAF or PI3'K inhibition upregulated sodium-iodine symporter transcription. This translated into a stable reduction of tumor burden when mice were treated with a MEK inhibitor before radioiodine administration. Conclusion: This study confirms the ability of MEK inhibition to induce iodine uptake in in vitro and in vivo models of ATC. The approach of using a MEK inhibitor before radioiodine treatment could readily be translated into clinical practice and provide a much-needed therapeutic option for patients with ATC.
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Affiliation(s)
- Oussama ElMokh
- Institute for Biochemistry and Molecular Medicine, University of Bern, Bern, Switzerland
| | - Vincent Taelman
- Institute for Nuclear Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - Piotr Radojewski
- Institute for Nuclear Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - Matthias A Roelli
- Institute for Biochemistry and Molecular Medicine, University of Bern, Bern, Switzerland
| | - Amandine Stoss
- Institute for Biochemistry and Molecular Medicine, University of Bern, Bern, Switzerland
| | - Rebecca A Dumont
- Department of Radiology, University of California at San Francisco, San Francisco, California
| | | | - Wayne A Phillips
- Cancer Biology Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - Martin A Walter
- Institute for Nuclear Medicine, Geneva University Hospitals, Geneva, Switzerland
| | - Roch-Philippe Charles
- Institute for Biochemistry and Molecular Medicine, University of Bern, Bern, Switzerland
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De Vlam K, Lories R, Steinfeld S, Van Den Bosch F, Nzeusseu Toukap A, Malaise M, Taelman V, Van Bruwaene F, Vanden Berghe M, Joos R, Lenaerts J, Geusens P, Dall'Armellina S, Peene I, De Branbanter G, Van Den Berghe M, Qu J, Maertens M, Leroi H. FRI0461 Higher Burden of Disease in Female Psa Patients Compared To Male Patients. Data from The Bepas Cohort:. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.3621] [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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De Vlam K, Lories R, Steinfeld S, Van Den Bosch F, Nzeusseu Toukap A, Malaise M, Taelman V, Van Bruwaene F, Van Den Berghe M, Lenaerts J, Joos R, Geusens P, Dall'Armellina S, Peene I, De Brabanter G, Van Den Berghe M, Qu J, Maertens M, Leroi H. FRI0462 Gender Differences in The Disease Expression and Articular Manifestations among Patients with Psoriatic Arthritis. Data from The Bepas Cohort:. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.5831] [Citation(s) in RCA: 1] [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: 11/04/2022]
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De Vlam K, Lories R, Steinfeld S, Van Den Bosch F, Nzeusseu Toukap A, Malaise M, Taelman V, Van Bruwaene F, Van Den Berghe M, Lenaerts J, Joos R, Geusens P, Dall'Armellina S, Peene I, De Brabanter G, Van Den Berghe M, Qu J, Maertens M, Leroi H. AB0736 The Bepas Cohort: A Real-Life Multicenter Prospective Cohort of Psoriatic Arthritis in Belgium: Demographics and Baseline Characteristics:. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.5773] [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: 11/03/2022]
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De Vlam K, Lories R, Steinfeld S, Van Den Bosch F, Nzeusseu Toukap A, Malaise M, Taelman V, Van Bruwaene F, Van Den Berghe M, Lenaerts J, Joos R, Geusens P, Dall'Armellina S, Peene I, De Brabanter G, Van Den Berghe M, Qu J, Maertens M, Leroi H. AB0737 Clinical Axial Involvement in Patients with Psoriatic Arthritis Is Underestimated: Impact on Burden of The Disease. Data from The Bepas Cohort:. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.5850] [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: 11/03/2022]
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De Cock D, Corluy L, Joos R, Langenaken C, Taelman V, Raeman F, Ravilingien I, Vandevyvere K, Lenaerts J, Geens E, Geusens P, Vanhoof J, Durnez A, Remans J, Vander Cruyssen B, Van Essche E, Sileghem A, De Brabanter G, Joly J, Meyfroidt S, Van der Elst K, Westhovens R, Verschueren P. THU0117 Low-Risk Patients Also Benefit from Remission Induction Treatment in Early Rheumatoid Arthritis: Week 52 Results from the Carera Trial. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.3984] [Citation(s) in RCA: 1] [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: 11/03/2022]
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Verschueren P, De Cock D, Corluy L, Joos R, Langenaken C, Taelman V, Raeman F, Ravilingien I, Vandevyvere K, Lenaerts J, Geens E, Geusens P, Vanhoof J, Durnez A, Remans J, Vander Cruyssen B, Van Essche E, Sileghem A, De Brabanter G, Joly J, Van der Elst K, Meyfroidt S, Westhovens R. OP0180 Remission Induction with Dmard Combinations and Glucocorticoids is not Superior to Remission Induction with MTX Monotherapy and Glucocorticoids: Week 52 Results of the High-Risk Group from the Carera Trial. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.4018] [Citation(s) in RCA: 1] [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: 11/03/2022]
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de Vlam K, Lories R, Steinfeld S, van den Bosch F, Nzeusseu Toukap A, Malaise M, Taelman V, Van Bruwaene F, Vanden Berghe M, Joos R, Lenaerts J, Geussens P, Dalli'Armellina S, Peene I, De Brabanter G, Van Den Berghe M, Qu J, Maertens M, Leroi H. AB0814 The BEPAS Cohort: A Prospective Cohort of Psoriatic Arthritis in Belgium: Study Design and Baseline Characteristics of the 461 Recruited Patients. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.5560] [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: 11/03/2022]
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Verschueren P, De Cock D, Corluy L, Joos R, Langenaken C, Taelman V, Raeman F, Ravelingien I, Vandevyvere K, Lenaerts J, Geens E, Geusens P, Vanhoof J, Durnez A, Remans J, Vander Cruyssen B, Van Essche E, Sileghem A, De Brabanter G, Joly J, Meyfroidt S, Van der Elst K, Westhovens R. Methotrexate in combination with other DMARDs is not superior to methotrexate alone for remission induction with moderate-to-high-dose glucocorticoid bridging in early rheumatoid arthritis after 16 weeks of treatment: the CareRA trial. Ann Rheum Dis 2014; 74:27-34. [DOI: 10.1136/annrheumdis-2014-205489] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
ObjectivesTo compare the efficacy and safety of intensive combination strategies with glucocorticoids (GCs) in the first 16 weeks (W) of early rheumatoid arthritis (eRA) treatment, focusing on high-risk patients, in the Care in early RA trial.Methods400 disease-modifying antirheumatic drugs (DMARD)-naive patients with eRA were recruited and stratified into high risk or low risk according to classical prognostic markers. High-risk patients (n=290) were randomised to 1/3 treatment strategies: combination therapy for early rheumatoid arthritis (COBRA) Classic (methotrexate (MTX)+ sulfasalazine+60 mg prednisone tapered to 7.5 mg daily from W7), COBRA Slim (MTX+30 mg prednisone tapered to 5 mg from W6) and COBRA Avant-Garde (MTX+leflunomide+30 mg prednisone tapered to 5 mg from W6). Treatment modifications to target low-disease activity were mandatory from W8, if desirable and feasible according to the rheumatologist. The primary outcome was remission (28 joint disease activity score calculated with C-reactive protein <2.6) at W16 (intention-to-treat analysis). Secondary endpoints were good European League Against Rheumatism response, clinically meaningful health assessment questionnaire (HAQ) response and HAQ equal to zero. Adverse events (AEs) were registered.ResultsData from 98 Classic, 98 Slim and 94 Avant-Garde patients were analysed. At W16, remission was reached in 70.4% Classic, 73.6% Slim and 68.1% Avant-Garde patients (p=0.713). Likewise, no significant differences were shown in other secondary endpoints. However, therapy-related AEs were reported in 61.2% of Classic, in 46.9% of Slim and in 69.1% of Avant-Garde patients (p=0.006).ConclusionsFor high-risk eRA, MTX associated with a moderate step-down dose of GCs was as effective in inducing remission at W16 as DMARD combination therapies with moderate or high step-down GC doses and it showed a more favourable short-term safety profile.EudraCT number:2008-007225-39.
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Verschueren P, De Cock D, Corluy L, Joos R, Langenaken C, Taelman V, Raeman F, Ravelingien I, Vandevyvere K, Lenaerts J, Geens E, Geusens P, Vanhoof J, Durnez A, Remans J, Vander Cruyssen B, Van Essche E, Sileghem A, De Brabanter G, Joly J, Meyfroidt S, Van der Elst K, Westhovens R. THU0137 Associated with A Glucocorticoid Bridging Scheme, Methotrexate is as Effective Alone as in Combination with Other DMARDS for Early Rheumatoid Arthritis, with Fewer Reported Side Effects: 16 Weeks Remission Induction Data from the Carera Trial. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.2137] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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De Cock D, Westhovens R, Corluy L, Joos R, Langenaken C, Taelman V, Raeman F, Ravelingien I, Vandevyvere K, Lenaerts J, Geens E, Geusens P, Vanhoof J, Durnez A, Remans J, Vander Cruyssen B, Van Essche E, Sileghem A, De Brabanter G, Joly J, Meyfroidt S, Van der Elst K, Verschueren P. THU0121 Comparison of MTX Therapy with or without A Moderate Dose Glucocorticoid Bridging Scheme in Early Rheumatoid Arthritis Patients Lacking Classical Poor Prognostic Markers: Week 16 Results from the Randomized Multicenter Carera Trial. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.2144] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Plouhinec JL, Taelman V. [Tales of the Wnt pathway: how GSK3 got locked up inside multivesicular endosomes]. Med Sci (Paris) 2011; 27:1058-61. [PMID: 22192740 DOI: 10.1051/medsci/20112712007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Luyten A, Mortier E, Van Campenhout C, Taelman V, Degeest G, Wuytens G, Lambaerts K, David G, Bellefroid EJ, Zimmermann P. The postsynaptic density 95/disc-large/zona occludens protein syntenin directly interacts with frizzled 7 and supports noncanonical Wnt signaling. Mol Biol Cell 2008; 19:1594-604. [PMID: 18256285 DOI: 10.1091/mbc.e07-08-0832] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Wnt signaling pathways are essential for embryonic patterning, and they are disturbed in a wide spectrum of diseases, including cancer. An unresolved question is how the different Wnt pathways are supported and regulated. We previously established that the postsynaptic density 95/disc-large/zona occludens (PDZ) protein syntenin binds to syndecans, Wnt coreceptors, and known stimulators of protein kinase C (PKC)alpha and CDC42 activity. Here, we show that syntenin also interacts with the C-terminal PDZ binding motif of several Frizzled Wnt receptors, without compromising the recruitment of Dishevelled, a key downstream Wnt-signaling component. Syntenin is coexpressed with cognate Frizzled during early development in Xenopus. Overexpression and down-regulation of syntenin disrupt convergent extension movements, supporting a role for syntenin in noncanonical Wnt signaling. Syntenin stimulates c-jun phosphorylation and modulates Frizzled 7 signaling, in particular the PKCalpha/CDC42 noncanonical Wnt signaling cascade. The syntenin-Frizzled 7 binding mode indicates syntenin can accommodate Frizzled 7-syndecan complexes. We propose that syntenin is a novel component of the Wnt signal transduction cascade and that it might function as a direct intracellular link between Frizzled and syndecans.
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Affiliation(s)
- Annouck Luyten
- Department of Human Genetics, K.U. Leuven, B-3000 Leuven, Belgium
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van Grunsven LA, Taelman V, Michiels C, Opdecamp K, Huylebroeck D, Bellefroid EJ. deltaEF1 and SIP1 are differentially expressed and have overlapping activities during Xenopus embryogenesis. Dev Dyn 2007; 235:1491-500. [PMID: 16518800 DOI: 10.1002/dvdy.20727] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The zinc finger/homeo-domain transcription factor (zfh x 1) family in vertebrates consists of two members, deltaEF1 and SIP1. They have been proposed to display antagonistic activities in the interpretation of Smad-dependent TGFbeta signaling during mesoderm formation. We cloned Xenopus deltaEF1 cDNA, analyzed the expression profile of the gene, and compared the inducing and interacting properties of the protein to that of XSIP1. Whereas XSIP1 RNA is selectively expressed in the early developing nervous system, we show that XdeltaEF1 gene transcription is only activated during neurulation and that its expression is restricted to the paraxial mesoderm. From early tail bud stage, XdeltaEF1 and XSIP1 are coexpressed in migratory cranial neural crest, in the retina, and in the neural tube. Overproduction of XdeltaEF1 in RNA-injected embryos, like that of XSIP1, reduced the expression of BMP-dependent genes but only XSIP1 has the ability to induce neural markers. We find that XdeltaEF1 and XSIP1 can both form complexes, although with different efficiency, with Smad3, with the coactivators p300 and pCAF, and with the corepressor CtBP1. Together, these results indicate that deltaEF1 and SIP1 do not function as antagonists during Xenopus early embryogenesis but do display different repression efficiencies and interaction properties.
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Affiliation(s)
- Leo A van Grunsven
- Department of Developmental Biology (VIB7), Flanders Interuniversity Institute for Biotechnology (VIB) and Laboratory of Molecular Biology (Celgen), University of Leuven, Campus Gasthuisberg, Leuven, Belgium
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Plouhinec I, Ambrosio A, Hurtado C, De Robertis E, Eivers E, Lee HX, Fuentealba L, Taelman V. WITHDRAWN: Self-regulation of embryonic pattern in Xenopus embryos. Dev Biol 2007. [DOI: 10.1016/j.ydbio.2007.03.041] [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: 10/23/2022]
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van Grunsven LA, Taelman V, Michiels C, Verstappen G, Souopgui J, Nichane M, Moens E, Opdecamp K, Vanhomwegen J, Kricha S, Huylebroeck D, Bellefroid EJ. XSip1 neuralizing activity involves the co-repressor CtBP and occurs through BMP dependent and independent mechanisms. Dev Biol 2007; 306:34-49. [PMID: 17442301 DOI: 10.1016/j.ydbio.2007.02.045] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2006] [Revised: 02/13/2007] [Accepted: 02/16/2007] [Indexed: 12/31/2022]
Abstract
The DNA-binding transcription factor Smad-interacting protein-1 (Sip1) (also named Zfhx1b/ZEB2) plays essential roles in vertebrate embryogenesis. In Xenopus, XSip1 is essential at the gastrula stage for neural tissue formation, but the precise molecular mechanisms that underlie this process have not been fully identified yet. Here we show that XSip1 functions as a transcriptional repressor during neural induction. We observed that constitutive activation of BMP signaling prevents neural induction by XSip1 but not the inhibition of several epidermal genes. We provide evidence that XSip1 binds directly to the BMP4 proximal promoter and modulates its activity. Finally, by deletion and mutational analysis, we show that XSip1 possesses multiple repression domains and that CtBPs contribute to its repression activity. Consistent with this, interference with XCtBP function reduced XSip1 neuralizing activity. These results suggest that Sip1 acts in neural tissue formation through direct repression of BMP4 but that BMP-independent mechanisms are involved as well. Our data also provide the first demonstration of the importance of CtBP binding in Sip1 transcriptional activity in vivo.
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Affiliation(s)
- Leo A van Grunsven
- Department of Developmental Biology, Flanders Interuniversity Institute for Biotechnology and Laboratory of Molecular Biology, Celgen, Division of Molecular and Developmental Genetics, K.U. Leuven VIB, Leuven, Belgium
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Sölter M, Locker M, Boy S, Taelman V, Bellefroid EJ, Perron M, Pieler T. Characterization and function of the bHLH-O protein XHes2: insight into the mechanisms controlling retinal cell fate decision. Development 2007; 133:4097-108. [PMID: 17008450 DOI: 10.1242/dev.02567] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [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: 11/20/2022]
Abstract
Neurons and glial cells differentiate from common multipotent precursors in the vertebrate retina. We have identified a novel member of the hairy/Enhancer of split [E(spl)] gene family in Xenopus, XHes2, as a regulator to bias retinal precursor cells towards a glial fate. XHes2 expression is predominantly restricted to sensory organ territories, including the retina. Using in vivo lipofection in the optic vesicle, we found that XHes2 overexpression dramatically increases gliogenesis at the expense of neurogenesis. This increase in glial cells correlates with a delayed cell cycle withdrawal of some retinal progenitors. In addition, birthdating experiments suggest that XHes2 deviates some early born cell types towards a glial fate that would normally have given rise to neurons. Conversely, a significant inhibition of glial differentiation is observed upon XHes2 loss of function. The gliogenic activity of XHes2 relies on its ability to inhibit neuronal differentiation by at least two distinct mechanisms: it not only negatively regulates XNgnr1 and NeuroD transcription, but it also physically interacts with a subset of proneural bHLH proteins.
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Affiliation(s)
- Marion Sölter
- DFG-Center of Molecular Physiology of the Brain, Department of Developmental Biochemistry, University of Goettingen, Justus-von-Liebig-Weg 11, 37077 Goettingen, Germany
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Matricali GA, Boonen A, Verduyckt J, Taelman V, Verschueren P, Sileghem A, Corluy L, Westhovens R. The presence of forefoot problems and the role of surgery in patients with rheumatoid arthritis. Ann Rheum Dis 2006; 65:1254-5. [PMID: 16905588 PMCID: PMC1798284 DOI: 10.1136/ard.2005.050823] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Taelman V, Van Campenhout C, Sölter M, Pieler T, Bellefroid EJ. The Notch-effector HRT1 gene plays a role in glomerular development and patterning of the Xenopus pronephros anlagen. Development 2006; 133:2961-71. [PMID: 16818449 DOI: 10.1242/dev.02458] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [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: 11/20/2022]
Abstract
Notch signaling has been shown to play a role in cell fate decisions in the Xenopus pronephros anlagen. Here, we show that the Xenopus Hairy-related transcription factor (HRT) gene XHRT1, and the Hairy/Enhancer of split (HES) genes Xhairy1, Xhairy2b, esr9 and esr10, have distinct restricted dynamic expression patterns during pronephros development, and that their expression is regulated by Notch. XHRT1, which is the earliest and strongest gene expressed in the pronephric region, is initially transcribed predominantly in the forming glomus, where it is downregulated by antisense morpholino oligonucleotide inhibition of xWT1. Later, it is activated in the most dorsoanterior part of the pronephros anlagen that gives rise to the proximal tubules. In agreement with this dynamic expression profile, we found that early activation of Notch favors glomus, whereas only later activation promotes proximal tubule formation. We show that, among the bHLH-O factors tested, only XHRT1 efficiently inhibits distal tubule and duct formation, and that only its translational inhibition causes a reduction of the expression of proximal tubule and glomus markers. Using domain swap experiments, we found that the XHRT1 C-terminal region is crucial for its activity. Together, our results provide evidence that XHRT1 plays an important role in glomerular development and early proximodistal patterning that is distinct from those of the other pronephric bHLH repressors.
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Affiliation(s)
- Vincent Taelman
- Laboratoire d'Embryologie Moléculaire, Université Libre de Bruxelles, Institut de Biologie et de Médecine Moléculaires (IBMM), Gosselies, Belgium
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Boonen A, Matricali GA, Verduyckt J, Taelman V, Verschueren P, Sileghem A, Corluy L, Westhovens R. Orthopaedic surgery in patients with rheumatoid arthritis: a shift towards more frequent and earlier non-joint-sacrificing surgery. Ann Rheum Dis 2006; 65:694-5. [PMID: 16611873 PMCID: PMC1798119 DOI: 10.1136/ard.2005.047175] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Taelman V, Van Wayenbergh R, Sölter M, Pichon B, Pieler T, Christophe D, Bellefroid EJ. Sequences downstream of the bHLH domain of the Xenopus hairy-related transcription factor-1 act as an extended dimerization domain that contributes to the selection of the partners. Dev Biol 2004; 276:47-63. [PMID: 15531363 DOI: 10.1016/j.ydbio.2004.08.019] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2004] [Revised: 08/04/2004] [Accepted: 08/05/2004] [Indexed: 11/28/2022]
Abstract
XHRT1 is a member of the HRT/Hey protein subfamily that are known as Notch effectors. XHRT1 is expressed in the developing floor plate and encodes a basic helix-loop-helix (bHLH) transcription repressor. Here, we show that XHRT1 misexpression in the neural plate inhibits differentiation of neural precursor cells and thus may be important for floor plate cells to prevent them from adopting a neuronal fate. Deletion analysis indicated that inhibition of differentiation by XHRT1 requires the DNA-binding bHLH motif and either the Orange domain or the C-terminal region. XHRT1 could efficiently homodimerize and heterodimerize with hairy proteins. Among those hairy genes, Xhairy2b shows extensive overlap of expression with XHRT1 in floor plate precursors and may be a biologically relevant XHRT1 partner. Dimerization is mediated through both the bHLH and downstream sequences, the Orange domain being particularly important for the efficiency of the interaction. Using chimeric constructs between XHRT1 and the ESR9 bHLH-O protein that does not interact with Xhairy1 and Xhairy2b, we found that both the bHLH domain and downstream sequences of XHRT1 were required for heterodimerization with Xhairy2b, while only the XHRT1 sequences downstream of the Orange domain are required for the interaction with Xhairy1. Together, these results suggest that XHRT1 plays a role in floor plate cell development and highlight the importance of the Orange and downstream sequences in dimerization and in the selection of the bHLH partners.
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Affiliation(s)
- Vincent Taelman
- Laboratoire d'Embryologie Moléculaire, Université Libre de Bruxelles, Institut de Biologie et de Médecine Moléculaires (IBMM), rue des Profs. Jeener et Brachet 12, B-6041 Gosselies, Belgium
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Pichon B, Taelman V, Bellefroid EJ, Christophe D. Transcriptional repression by the bHLH-Orange factor XHRT1 does not involve the C-terminal YRPW motif. ACTA ACUST UNITED AC 2004; 1680:46-52. [PMID: 15451171 DOI: 10.1016/j.bbaexp.2004.08.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2004] [Revised: 08/02/2004] [Accepted: 08/30/2004] [Indexed: 11/16/2022]
Abstract
Hairy-related transcription factors (HRTs) constitute a recently identified subfamily of basic-helix-loop-helix transcription factors containing an Orange domain (bHLH-O factors). As compared to the related HES proteins, HRTs exhibit distinct DNA-binding activities in vitro and the molecular mechanisms underlying their transcriptional activity remain poorly understood. We have identified here the sequence "ggCACGTGcc" as predominant binding site for Xenopus HRT1 (XHRT1). In transiently transfected 3T3 cells, XHRT1 represses the expression of a luciferase reporter gene under the control of multimerized XHRT1 binding sites. Deletion analysis indicated that repression by XHRT1 requires the presence of the DNA-binding bHLH motif and the Orange domain. However, the presence of the sequence motif YRPWGTEIGAF located at the very C-terminus of XHRT1 is dispensable. Accordingly, the groucho co-repressor, which is known to mediate transcriptional repression by HES factors through binding their C-terminal WRPW sequence, does not recognize the related YRPW motif present in the C-terminal part of XHRT1 significantly in vitro. As the C-terminus of HRTs is well conserved, our observation indicates that this part of HRTs, unlike the corresponding part of HES proteins, does not recruit the groucho co-repressor efficiently.
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Affiliation(s)
- Bruno Pichon
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), B-6041 Gosselies, Belgium
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Van Wayenbergh R, Taelman V, Pichon B, Fischer A, Kricha S, Gessler M, Christophe D, Bellefroid EJ. Identification of BOIP, a novel cDNA highly expressed during spermatogenesis that encodes a protein interacting with the orange domain of the hairy-related transcription factor HRT1/Hey1 in Xenopus and mouse. Dev Dyn 2004; 228:716-25. [PMID: 14648848 DOI: 10.1002/dvdy.10406] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [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: 11/11/2022] Open
Abstract
Hairy-related transcription factor (HRT/Hey) genes encode a novel subfamily of basic helix-loop-helix (bHLH) transcription factors related to the Drosophila hairy and Enhancer-of-split (E(spl)) and the mammalian HES proteins that function as downstream mediators of Notch signaling. Using the yeast two-hybrid approach, a previously uncharacterized protein was identified in Xenopus that interacts with XHRT1 (originally referred to as bc8), one member of the HRT/Hey subclass. This protein is evolutionarily conserved in chordates. It binds to sequences adjacent to the bHLH domain of XHRT1 known as the Orange domain and has been named bc8 Orange interacting protein (BOIP). BOIP shows a rather uniform subcellular localization and is recruited to the nucleus upon binding to XHRT1. In Xenopus, XBOIP mRNA is detected by RNase protection analysis throughout embryogenesis. In the adult, the strongest expression is detected in testis. In the mouse, high levels of BOIP mRNA are also found in adult testis. No expression is detected in the embryo and in any of the other adult organs tested. In situ hybridization revealed that BOIP transcripts were detected almost exclusively in round spermatids and that this expression overlaps with that of Hey1 (HRT1), which is expressed throughout spermatogenesis. In view of the importance of the Orange domain for HRT/Hey function, the newly identified BOIP proteins may serve as regulators specifically of HRT1/Hey1 activity.
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Affiliation(s)
- Reginald Van Wayenbergh
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM) and Institut de Biologie et de Médecine Moléculaires (IBMM), Université Libre de bruxelles, Gosselies, Belgium
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Pichon B, Taelman V, Kricha S, Christophe D, Bellefroid EJ. XHRT-1, a hairy and Enhancer of split related gene with expression in floor plate and hypochord during early Xenopus embryogenesis. Dev Genes Evol 2002; 212:491-5. [PMID: 12424520 DOI: 10.1007/s00427-002-0270-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2002] [Accepted: 08/14/2002] [Indexed: 11/28/2022]
Abstract
We have isolated a Xenopus homologue of the mammalian hairy and Enhancer of split related gene HRT1. XHRT1 expression in late gastrula and early neurula embryos is restricted to two stripes of cells in the medial neural plate and in dorsal endodermal cells. At later stages, XHRT1 is expressed in the floor plate, in hypochord cells and in the somitogenic and anterior presomitic mesoderm. By tailbud stage, XHRT1 is also highly expressed in the dorsal hindbrain, telencephalon and eye vesicles, olfactory placodes, pronephros, branchial arches and tail fin. We also show that XHRT1 expression in medial neural cells is induced by Notch signaling and that there are differences in the way XHRT1 and other H/E(spl) genes are regulated.
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Affiliation(s)
- Bruno Pichon
- IRIBHM, Université Libre de Bruxelles, Rue des Profs. Jeener et Brachet 12, 6041 Gosselies, Belgium
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Taelman V, Opdecamp K, Avalosse B, Ryan K, Bellefroid EJ. Xath2, a bHLH gene expressed during a late transition stage of neurogenesis in the forebrain of Xenopus embryos. Mech Dev 2001; 101:199-202. [PMID: 11231075 DOI: 10.1016/s0925-4773(00)00546-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [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: 11/20/2022]
Abstract
We have identified a Xenopus bHLH gene, Xath2, which is the homologue of the murine MATH-2/NEX-1 gene, using a functional expression screening approach. Overexpression of this gene in neurula embryos induces the expression of the N-tubulin neuronal marker but does not stimulate the expression of the X-ngnr-1 and NeuroD proneural genes. Expression of Xath2 begins in stage 32 embryos and is restricted to the dorsal telencephalon. Within the neuroepithelium of the dorsal telencephalon, Xath2 expression is detected in postmitotic cells located more laterally than those expressing several other related bHLH neuronal regulators.
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Affiliation(s)
- V Taelman
- Laboratoire d'Embryologie Moléculaire, IBMM, Université Libre de Bruxelles, Rue des Profs. Jeener et Brachet 12, B-6041, Gosselies, Belgium
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Abstract
The objectives were to assess bone mineral density (BMD) at different body sites in rheumatoid arthritis (RA) patients related to disease severity parameters, disease duration and corticosteroid intake, and to look for body composition measurements as lean body mass (LBM) and per cent fat as possible prognostic factors in RA. Body composition values were measured cross-sectionally in 89 RA patients and compared with 157 controls. Patients were divided into males and postmenopausal females, ever steroid treated and never steroid treated. BMD values of all body sites were significantly lower compared to normals in all subgroups, except for the lumbar spine (L2 L4) in all postmenopausal women and males never treated with steroids. There was also no clear BMD decrease in the arms of male RA patients. LBM was significantly lower in all body parts compared to controls, whereas the fat distribution ratio (FDR) showed a clear shift to abdominal in all patients. These are parameters of chronic illness and a predictor of cardiovascular disease, respectively. BMD data confirm our previous data in different patient groups (low at appendicular sites, normal lumbar BMD), but no clear influence of disease severity and steroid intake could be found. Body composition data, as LBM and FDR, are also altered in RA patients: decreased LMB and more central FDR. Their usefulness as prognostic markers in early RA patients needs to be clarified prospectively in these patient groups.
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Affiliation(s)
- R Westhovens
- Arthritis and Metabolic Bone Disease Research Unit, K.U. Leuven, Belgium
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