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Sewduth R, Pandolfi S, Steklov M, Sheryazdanova A, Zhao P, Criem N, Baietti M, Lechat B, Quarck R, Impens F, Sablina A. The Noonan Syndrome Gene Lztr1 Controls Cardiovascular Function by Regulating Vesicular Trafficking. Circ Res 2020; 126:1379-1393. [PMID: 32175818 PMCID: PMC8575076 DOI: 10.1161/circresaha.119.315730] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
RATIONALE Noonan syndrome (NS) is one of the most frequent genetic disorders. Bleeding problems are among the most common, yet poorly defined complications associated with NS. A lack of consensus on the management of bleeding complications in patients with NS indicates an urgent need for new therapeutic approaches. OBJECTIVE Bleeding disorders have recently been described in patients with NS harboring mutations of LZTR1 (leucine zipper-like transcription regulator 1), an adaptor for CUL3 (CULLIN3) ubiquitin ligase complex. Here, we assessed the pathobiology of LZTR1-mediated bleeding disorders. METHODS AND RESULTS Whole-body and vascular specific knockout of Lztr1 results in perinatal lethality due to cardiovascular dysfunction. Lztr1 deletion in blood vessels of adult mice leads to abnormal vascular leakage. We found that defective adherent and tight junctions in Lztr1-depleted endothelial cells are caused by dysregulation of vesicular trafficking. LZTR1 affects the dynamics of fusion and fission of recycling endosomes by controlling ubiquitination of the ESCRT-III (endosomal sorting complex required for transport III) component CHMP1B (charged multivesicular protein 1B), whereas NS-associated LZTR1 mutations diminish CHMP1B ubiquitination. LZTR1-mediated dysregulation of CHMP1B ubiquitination triggers endosomal accumulation and subsequent activation of VEGFR2 (vascular endothelial growth factor receptor 2) and decreases blood levels of soluble VEGFR2 in Lztr1 haploinsufficient mice. Inhibition of VEGFR2 activity by cediranib rescues vascular abnormalities observed in Lztr1 knockout mice Conclusions: Lztr1 deletion phenotypically overlaps with bleeding diathesis observed in patients with NS. ELISA screening of soluble VEGFR2 in the blood of LZTR1-mutated patients with NS may predict both the severity of NS phenotypes and potential responders to anti-VEGF therapy. VEGFR inhibitors could be beneficial for the treatment of bleeding disorders in patients with NS.
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Affiliation(s)
- R. Sewduth
- VIB-KU Leuven Center for Cancer Biology, VIB, Herestraat 49, 3000 Leuven, Belgium
- Department of Oncology, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - S. Pandolfi
- VIB-KU Leuven Center for Cancer Biology, VIB, Herestraat 49, 3000 Leuven, Belgium
- Department of Oncology, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - M. Steklov
- VIB-KU Leuven Center for Cancer Biology, VIB, Herestraat 49, 3000 Leuven, Belgium
- Department of Oncology, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - A. Sheryazdanova
- VIB-KU Leuven Center for Cancer Biology, VIB, Herestraat 49, 3000 Leuven, Belgium
- Department of Oncology, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - P. Zhao
- VIB-KU Leuven Center for Cancer Biology, VIB, Herestraat 49, 3000 Leuven, Belgium
- Department of Oncology, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - N. Criem
- VIB-KU Leuven Center for Cancer Biology, VIB, Herestraat 49, 3000 Leuven, Belgium
- Department of Oncology, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - M.F. Baietti
- VIB-KU Leuven Center for Cancer Biology, VIB, Herestraat 49, 3000 Leuven, Belgium
- Department of Oncology, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - B. Lechat
- VIB-KU Leuven Center for Cancer Biology, VIB, Herestraat 49, 3000 Leuven, Belgium
- Department of Oncology, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - R. Quarck
- University Hospitals and Department of Chronic Diseases, Metabolism & Ageing (CHROMETA), KU Leuven, Herestraat 49, 3000 Leuven, Belgium
| | - F. Impens
- Department of Biomolecular Medicine, Ghent University, B-9000 Ghent, Belgium
- VIB Center for Medical Biotechnology, B-9000 Ghent, Belgium
- VIB Proteomics Core, Albert Baertsoenkaai 3, 9000 Ghent, Belgium
| | - A.A. Sablina
- VIB-KU Leuven Center for Cancer Biology, VIB, Herestraat 49, 3000 Leuven, Belgium
- Department of Oncology, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
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