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Pilz RA, Skowronek D, Mellinger L, Bekeschus S, Felbor U, Rath M. Endothelial Differentiation of CCM1 Knockout iPSCs Triggers the Establishment of a Specific Gene Expression Signature. Int J Mol Sci 2023; 24:ijms24043993. [PMID: 36835400 PMCID: PMC9963194 DOI: 10.3390/ijms24043993] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 02/09/2023] [Accepted: 02/13/2023] [Indexed: 02/18/2023] Open
Abstract
Cerebral cavernous malformation (CCM) is a neurovascular disease that can lead to seizures and stroke-like symptoms. The familial form is caused by a heterozygous germline mutation in either the CCM1, CCM2, or CCM3 gene. While the importance of a second-hit mechanism in CCM development is well established, it is still unclear whether it immediately triggers CCM development or whether additional external factors are required. We here used RNA sequencing to study differential gene expression in CCM1 knockout induced pluripotent stem cells (CCM1-/- iPSCs), early mesoderm progenitor cells (eMPCs), and endothelial-like cells (ECs). Notably, CRISPR/Cas9-mediated inactivation of CCM1 led to hardly any gene expression differences in iPSCs and eMPCs. However, after differentiation into ECs, we found the significant deregulation of signaling pathways well known to be involved in CCM pathogenesis. These data suggest that a microenvironment of proangiogenic cytokines and growth factors can trigger the establishment of a characteristic gene expression signature upon CCM1 inactivation. Consequently, CCM1-/- precursor cells may exist that remain silent until entering the endothelial lineage. Collectively, not only downstream consequences of CCM1 ablation but also supporting factors must be addressed in CCM therapy development.
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Affiliation(s)
- Robin A. Pilz
- Department of Human Genetics, University Medicine Greifswald and Interfaculty Institute of Genetics and Functional Genomics, University of Greifswald, 17475 Greifswald, Germany
| | - Dariush Skowronek
- Department of Human Genetics, University Medicine Greifswald and Interfaculty Institute of Genetics and Functional Genomics, University of Greifswald, 17475 Greifswald, Germany
| | - Lara Mellinger
- Department of Human Genetics, University Medicine Greifswald and Interfaculty Institute of Genetics and Functional Genomics, University of Greifswald, 17475 Greifswald, Germany
| | - Sander Bekeschus
- ZIK Plasmatis, Leibniz Institute for Plasma Science and Technology (INP), 17489 Greifswald, Germany
| | - Ute Felbor
- Department of Human Genetics, University Medicine Greifswald and Interfaculty Institute of Genetics and Functional Genomics, University of Greifswald, 17475 Greifswald, Germany
| | - Matthias Rath
- Department of Human Genetics, University Medicine Greifswald and Interfaculty Institute of Genetics and Functional Genomics, University of Greifswald, 17475 Greifswald, Germany
- Department of Human Medicine and Institute for Molecular Medicine, MSH Medical School Hamburg, 20457 Hamburg, Germany
- Correspondence: ; Tel.: +49-3834-865396
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Ulas T, Pirr S, Fehlhaber B, Bickes MS, Loof TG, Vogl T, Mellinger L, Heinemann AS, Burgmann J, Schöning J, Schreek S, Pfeifer S, Reuner F, Völlger L, Stanulla M, von Köckritz-Blickwede M, Glander S, Barczyk-Kahlert K, von Kaisenberg CS, Friesenhagen J, Fischer-Riepe L, Zenker S, Schultze JL, Roth J, Viemann D. Corrigendum: S100-alarmin-induced innate immune programming protects newborn infants from sepsis. Nat Immunol 2017; 18:1173. [PMID: 28926540 DOI: 10.1038/ni1017-1173b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Heinemann AS, Pirr S, Fehlhaber B, Mellinger L, Burgmann J, Busse M, Ginzel M, Friesenhagen J, von Köckritz-Blickwede M, Ulas T, von Kaisenberg CS, Roth J, Vogl T, Viemann D. In neonates S100A8/S100A9 alarmins prevent the expansion of a specific inflammatory monocyte population promoting septic shock. FASEB J 2016; 31:1153-1164. [PMID: 27993995 DOI: 10.1096/fj.201601083r] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [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: 09/24/2016] [Accepted: 11/28/2016] [Indexed: 12/28/2022]
Abstract
The high susceptibility of newborn infants to sepsis is ascribed to an immaturity of the neonatal immune system, but the molecular mechanisms remain unclear. Newborn monocytes massively release the alarmins S100A8/S100A9. In adults, these are major regulators of immunosuppressive myeloid-derived suppressor cells (MDSCs). We investigated whether S100A8/S100A9 cause an expansion of monocytic MDSCs (Mo-MDSCs) in neonates, thereby contributing to an immunocompromised state. Mo-MDSCs have been assigned to CD14+/human leukocyte antigen (HLA)-DR-/low/CD33+ monocytes in humans and to CD11b+/Gr-1int/Ly6G-/Ly6Chi cells in mice. We found monocytes with these phenotypes significantly expanded in their respective newborns. Functionally, however, they did not prove immunosuppressive but rather responded inflammatorily to microbial stimulation. Their expansion did not correlate with high S100A8/S100A9 levels in cord blood. Murine studies revealed an excessive expansion of CD11b+/Gr-1int/Ly6G-/Ly6Chi monocytes in S100A9-/- neonates compared to wild-type neonates. This strong baseline expansion was associated with hyperinflammatory responses during endotoxemia and fatal septic courses. Treating S100A9-/- neonates directly after birth with S100A8/S100A9 alarmins prevented excessive expansion of this inflammatory monocyte population and death from septic shock. Our data suggest that a specific population of inflammatory monocytes promotes fatal courses of sepsis in neonates if its expansion is not regulated by S100A8/S100A9 alarmins.-Heinemann, A. S., Pirr, S., Fehlhaber, B., Mellinger, L., Burgmann, J., Busse, M., Ginzel, M., Friesenhagen, J., von Köckritz-Blickwede, M., Ulas, T., von Kaisenberg, C. S., Roth, J., Vogl, T., Viemann, D. In neonates S100A8/S100A9 alarmins prevent the expansion of a specific inflammatory monocyte population promoting septic shock.
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Affiliation(s)
- Anna S Heinemann
- Department of Pediatric Pneumology, Allergy, and Neonatology, Hannover Medical School, Hannover, Germany
| | - Sabine Pirr
- Department of Pediatric Pneumology, Allergy, and Neonatology, Hannover Medical School, Hannover, Germany
| | - Beate Fehlhaber
- Department of Pediatric Pneumology, Allergy, and Neonatology, Hannover Medical School, Hannover, Germany
| | - Lara Mellinger
- Department of Pediatric Pneumology, Allergy, and Neonatology, Hannover Medical School, Hannover, Germany
| | - Johanna Burgmann
- Department of Pediatric Pneumology, Allergy, and Neonatology, Hannover Medical School, Hannover, Germany
| | - Mandy Busse
- Department of Pediatric Pneumology, Allergy, and Neonatology, Hannover Medical School, Hannover, Germany
| | - Marco Ginzel
- Department of Pediatric Pneumology, Allergy, and Neonatology, Hannover Medical School, Hannover, Germany
| | - Judith Friesenhagen
- Department of Pediatric Pneumology, Allergy, and Neonatology, Hannover Medical School, Hannover, Germany
| | - Maren von Köckritz-Blickwede
- Department of Physiological Chemistry, University of Veterinary Medicine Hannover, Hannover, Germany.,Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Hannover, Germany
| | - Thomas Ulas
- Genomics and Immunoregulation, Life and Medical Sciences Institute, University of Bonn, Bonn, Germany
| | | | - Johannes Roth
- Institute of Immunology, University of Münster, Münster, Germany.,Interdisciplinary Centre for Clinical Research, University of Münster, Münster, Germany; and
| | - Thomas Vogl
- Institute of Immunology, University of Münster, Münster, Germany.,Interdisciplinary Centre for Clinical Research, University of Münster, Münster, Germany; and
| | - Dorothee Viemann
- Department of Pediatric Pneumology, Allergy, and Neonatology, Hannover Medical School, Hannover, Germany;
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