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Eley L, Alqahtani AM, MacGrogan D, Richardson RV, Murphy L, Salguero-Jimenez A, Sintes Rodriguez San Pedro M, Tiurma S, McCutcheon L, Gilmore A, de La Pompa JL, Chaudhry B, Henderson DJ. A novel source of arterial valve cells linked to bicuspid aortic valve without raphe in mice. eLife 2018; 7:34110. [PMID: 29956664 PMCID: PMC6025960 DOI: 10.7554/elife.34110] [Citation(s) in RCA: 105] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 06/12/2018] [Indexed: 12/20/2022] Open
Abstract
Abnormalities of the arterial valve leaflets, predominantly bicuspid aortic valve, are the commonest congenital malformations. Although many studies have investigated the development of the arterial valves, it has been assumed that, as with the atrioventricular valves, endocardial to mesenchymal transition (EndMT) is the predominant mechanism. We show that arterial is distinctly different from atrioventricular valve formation. Whilst the four septal valve leaflets are dominated by NCC and EndMT-derived cells, the intercalated leaflets differentiate directly from Tnnt2-Cre+/Isl1+ progenitors in the outflow wall, via a Notch-Jag dependent mechanism. Further, when this novel group of progenitors are disrupted, development of the intercalated leaflets is disrupted, resulting in leaflet dysplasia and bicuspid valves without raphe, most commonly affecting the aortic valve. This study thus overturns the dogma that heart valves are formed principally by EndMT, identifies a new source of valve interstitial cells, and provides a novel mechanism for causation of bicuspid aortic valves without raphe.
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Affiliation(s)
- Lorriane Eley
- Institute of Genetic Medicine, Cardiovascular Research Centre, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Ahlam Ms Alqahtani
- Institute of Genetic Medicine, Cardiovascular Research Centre, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Donal MacGrogan
- Intercellular Signalling in Cardiovascular Development and Disease Laboratory, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares, Instituto de Salud Carlos III, Madrid, Spain
| | - Rachel V Richardson
- Institute of Genetic Medicine, Cardiovascular Research Centre, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Lindsay Murphy
- Institute of Genetic Medicine, Cardiovascular Research Centre, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Alejandro Salguero-Jimenez
- Intercellular Signalling in Cardiovascular Development and Disease Laboratory, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares, Instituto de Salud Carlos III, Madrid, Spain
| | | | - Shindi Tiurma
- Institute of Genetic Medicine, Cardiovascular Research Centre, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Lauren McCutcheon
- Institute of Genetic Medicine, Cardiovascular Research Centre, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Adam Gilmore
- Institute of Genetic Medicine, Cardiovascular Research Centre, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - José Luis de La Pompa
- Intercellular Signalling in Cardiovascular Development and Disease Laboratory, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares, Instituto de Salud Carlos III, Madrid, Spain
| | - Bill Chaudhry
- Institute of Genetic Medicine, Cardiovascular Research Centre, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Deborah J Henderson
- Institute of Genetic Medicine, Cardiovascular Research Centre, Newcastle University, Newcastle upon Tyne, United Kingdom
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