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An Integrative Systems Approach Identifies Novel Candidates in Marfan Syndrome-Related Pathophysiology

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An Integrative Systems Approach Identifies Novel Candidates in Marfan Syndrome-Related Pathophysiology View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by The Jackson Laboratory: The Mouseion at the JAXlibrary The Jackson Laboratory The Mouseion at the JAXlibrary Faculty Research 2019 Faculty Research 2019 An integrative systems approach identifies novel candidates in Marfan syndrome-related pathophysiology. Raghu Bhushan Lukas Altinbas Marten Jäger Marcin Zaradzki Daniel Lehmann See next page for additional authors Follow this and additional works at: https://mouseion.jax.org/stfb2019 Part of the Life Sciences Commons, and the Medicine and Health Sciences Commons Recommended Citation Bhushan, Raghu; Altinbas, Lukas; Jäger, Marten; Zaradzki, Marcin; Lehmann, Daniel; Timmermann, Bernd; Clayton, Nicholas P; Zhu, Yunxiang; Kallenbach, Klaus; Kararigas, Georgios; and Robinson, Peter N, "An integrative systems approach identifies novel candidates in Marfan syndrome-related pathophysiology." (2019). Faculty Research 2019. 76. https://mouseion.jax.org/stfb2019/76 This Article is brought to you for free and open access by the Faculty Research at The ousM eion at the JAXlibrary. It has been accepted for inclusion in Faculty Research 2019 by an authorized administrator of The ousM eion at the JAXlibrary. For more information, please contact [email protected]. Authors Raghu Bhushan, Lukas Altinbas, Marten Jäger, Marcin Zaradzki, Daniel Lehmann, Bernd Timmermann, Nicholas P Clayton, Yunxiang Zhu, Klaus Kallenbach, Georgios Kararigas, and Peter N Robinson This article is available at The ousM eion at the JAXlibrary: https://mouseion.jax.org/stfb2019/76 Received: 20 May 2018 | Revised: 11 December 2018 | Accepted: 13 December 2018 DOI: 10.1111/jcmm.14137 ORIGINAL ARTICLE An integrative systems approach identifies novel candidates in Marfan syndrome‐related pathophysiology Raghu Bhushan1,2 | Lukas Altinbas1 | Marten Jäger1,3 | Marcin Zaradzki4 | Daniel Lehmann1 | Bernd Timmermann5 | Nicholas P. Clayton6 | Yunxiang Zhu6 | Klaus Kallenbach4,7 | Georgios Kararigas1,8 | Peter N. Robinson1,5,9 1Charité University Hospital, Berlin, Germany Abstract 2Yenepoya Research Centre, Yenepoya Marfan syndrome (MFS) is an autosomal dominant genetic disorder caused by (Deemed to be University), Deralakatte, mutations in the FBN1 gene. Although many peripheral tissues are affected, aortic Mangalore, India ‐ 3Berlin Institute of Health (BIH) Core complications, such as dilation, dissection and rupture, are the leading causes of MFS Genomics Facility, Charité, University related mortality. Aberrant TGF‐beta signalling plays a major role in the pathophysiol- Medical Center, Berlin, Germany ogy of MFS. However, the contributing mechanisms are still poorly understood. Here, 4Department of Cardiac Surgery, University Hospital Heidelberg, Heidelberg, Germany we aimed at identifying novel aorta‐specific pathways involved in the pathophysiology 5Max Planck Institute for Molecular of MFS. For this purpose, we employed the Fbn1 under‐expressing mgR/mgR mouse Genetics, Berlin, Germany model of MFS. We performed RNA‐sequencing of aortic tissues of 9‐week‐old mgR/ 6Sanofi Genzyme, Framingham, Massachusetts mgR mice compared with wild‐type (WT) mice. With a false discovery rate <5%, our 7Department of Cardiac Surgery, INCCI analysis revealed 248 genes to be differentially regulated including 20 genes previ- HaerzZenter, Luxembourg, Luxembourg ously unrelated with MFS‐related pathology. Among these, we identified Igfbp2, Ccl8, 8DZHK (German Centre for Cardiovascular Research), Berlin, Germany Spp1, Mylk2, Mfap4, Dsp and H19. We confirmed the expression of regulated genes by 9The Jackson Laboratory for Genomic quantitative real‐time PCR. Pathway classification revealed transcript signatures Medicine, Farmington, Connecticut involved in chemokine signalling, cardiac muscle contraction, dilated and hypertrophic Correspondence cardiomyopathy. Furthermore, our immunoblot analysis of aortic tissues revealed Raghu Bhushan, Yenepoya Research Centre, altered regulation of pSmad2 signalling, Perk1/2, Igfbp2, Mfap4, Ccl8 and Mylk2 Yenepoya (Deemed to be University), Deralakatte, Mangalore, India. protein levels in mgR/mgR vs WT mice. Together, our integrative systems approach Email: [email protected] identified several novel factors associated with MFS‐aortic‐specific pathophysiology and Peter N. Robinson, The Jackson Laboratory that might offer potential novel therapeutic targets for MFS. for Genomic Medicine, Farmington, CT. Email: [email protected] KEYWORDS Chemokine signalling, Igfbp2 signalling, Marfan syndrome, Mfap4, mgR/mgR, RNA-sequencing, Funding information Sanofi, Frankfurt, Germany Spp1, TGF-beta signalling, Transcriptomics 1 | INTRODUCTION skeleton, lung, skin and dura.1 The major complication is aortic dis- section, which generally occurs in the presence of aortic root dilata- Marfan syndrome (MFS) is an inherited autosomal connective tissue tion. In MFS, the extracellular matrix undergoes remodelling with disorder caused by mutations in an extracellular matrix protein, fib- increase in aortic stiffness and progressive weakening of the aortic rillin‐1(FBN1), with manifestations in the cardiovascular system, eye, wall leading to aortic dissection. ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. © 2019 The Authors. Journal of Cellular and Molecular Medicine published by John Wiley & Sons Ltd and Foundation for Cellular and Molecular Medicine. 2526 | wileyonlinelibrary.com/journal/jcmm J Cell Mol Med. 2019;23:2526–2535. BHUSHAN ET AL. | 2527 Extensive research has been conducted using mouse models with und Soziales in Berlin (LaGeSo Reg. No. 0024/14). Mice were sacri- mutant fibrillin‐1(Fbn1) that develop MFS‐like aortopathy despite ficed; the ascending aortas and arch of the mgR/mgR homozygous normal aortic elastogenesis.2–4 Two mice models, Fbn1C1039G/+ and and WT animals were isolated and pooled for subsequent RNA mgR/mgR with different degrees of MFS pathologies, have fre- expression analysis. quently been used in MFS studies.3–6 In the Fbn1C1039G/+ model, it has been observed that 90% of animals develop the variable severe 2.2 | Van Giesson staining phenotype and ~5% of animals die by 8 months of age as a result of aortic aneurysms.5 On contrary, the mgR/mgR (hypomorphic) model Aortic architecture was assessed using elastic van Giesson staining produces ~20% normal fibrillin1 that develops a severe form of MFS kit from Sigma‐Aldrich, following the manufacturer's instructions. with an earlier onset and an average survival of 2.5 months.2,7 Previous research has suggested that the pathophysiology of MFS 2.3 | RNA‐sequencing analysis can be explained by ongoing abnormalities in TGF‐beta signalling that lead to progressive destabilization of the aortic wall and it has been Total RNA was extracted from WT and mgR/mgR homozygous ani- suggested that fibrillin‐1 interacts with latent TGF‐beta binding pro- mals (9 weeks old animals) using the RNeasy mini kit (Qiagen). Library teins (LTBPs) to restrict TGF‐beta activation.8,9 Hence, the deficiency preparation was done using the TruSeq RNA Library Preparation Kit of fibrillin‐1 in MFS promotes the release and activation of TGF‐beta. v2 (Illumina) following the manufacturer's instructions. An Illumina Several studies have shown that there is an increased abundance of HiSeq 2500 sequencing device was used to perform the high TGF‐beta in MFS.8,10 In addition, non‐canonical TGF‐beta signalling throughput sequencing, to generate 65‐75 million reads of 50‐bp pathway (extracellular signal‐regulated kinase [ERK] 1 and 2) has also paired‐end reads, with a mean insert size of 150 bp. The reads were been shown to promote aortic aneurysms in Marfan mice.11 TGF‐beta mapped to Mus musculus genome build (mm9) using TopHat2.16 neutralizing antibodies (1D11) and Losartan (an angiotensin II type 1 DESeq217 was used for differential expression analysis with a false receptor [AT1] antagonist) have been shown to decrease TGF‐beta discovery rate of 0.05% (FDR). signalling in Marfan mouse models. Furthermore, aortic extracts con- taining elastin/fibrillin fragments with GxxPG motifs significantly 2.4 | qRT‐PCRs increased macrophage chemotaxis.12,13 Subsequent treatment of Mar- fan mice with a neutralizing antibody (BA4 ‐ anti‐elastin, monoclonal Freshly dissected aortic tissues were snap‐frozen in liquid nitrogen. Fro- antibody) decreased macrophage chemotaxis, inflammation and zen tissues were pulverized and RNA was isolated using Qiagen RNeasy degeneration of the vessel architecture.12 Mini kit following the manufacturer's instructions. For reverse transcrip- Overall, in the last decade, the leading hypothesis has been that tion, 1 microgram of RNA was used for conversion into cDNA using the TGF‐beta induction is a major driver of Marfan disease progression. RevertAid H minus cDNA Synthesis Kit (ThermoFisher Scientific). Real‐ This assumption was recently challenged by selectively deleting the time PCR was performed on the Applied Biosystems 7900HT real‐time TGF‐type‐II receptor in MFS mice (Fbn1C1039G/+) suggesting that PCR machine as described previously.18 Gapdh was used as endoge- increased TGF‐beta in MFS may not be the sole cause of MFS aor- nous control. Refer to Data
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