1
|
Weiler SME, Bissinger M, Rose F, von Bubnoff F, Lutz T, Ori A, Schirmacher P, Breuhahn K. SEPTIN10-mediated crosstalk between cytoskeletal networks controls mechanotransduction and oncogenic YAP/TAZ signaling. Cancer Lett 2024; 584:216637. [PMID: 38242197 DOI: 10.1016/j.canlet.2024.216637] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 12/19/2023] [Accepted: 01/09/2024] [Indexed: 01/21/2024]
Abstract
The transcriptional co-activators of the Hippo pathway, YAP and TAZ, are regulated by mechanotransduction, which depends on dynamic actin cytoskeleton remodeling. Here, we identified SEPTIN10 as a novel cytoskeletal protein, which is transcriptionally regulated by YAP/TAZ and whose overexpression correlates with poor survival and vascular invasion in hepatocellular carcinoma (HCC) patients. Functional characterization demonstrated that SEPTIN10 promotes YAP/TAZ-dependent cell viability, migration and invasion of liver cancer cells. Mechanistically, SEPTIN10 interacts with actin and microtubule filaments supporting actin stress fiber formation and intracellular tension through binding to CAPZA2 while concurrently inhibiting microtubule polymerization through the blockage of MAP4 function. This functional antagonism is important for cytoskeleton-dependent feedback activation of YAP/TAZ, as microtubule depolymerization induces actin stress fiber formation and subsequently YAP/TAZ activity. Importantly, the crosstalk between microfilaments and microtubules is mediated by SEPTIN10 as its loss abrogates actin stress fiber formation after microtubule disruption. Together, the YAP/TAZ target gene SEPTIN10 controls the dynamic interplay between actin and microtubule filaments, which feeds back on Hippo pathway activity in HCC cells and thus acts as molecular switch with impact on oncogenic signaling and cancer cell biology.
Collapse
Affiliation(s)
- Sofia M E Weiler
- Institute of Pathology, University Hospital Heidelberg, 69120, Heidelberg, Germany.
| | - Michaela Bissinger
- Institute of Pathology, University Hospital Heidelberg, 69120, Heidelberg, Germany
| | - Fabian Rose
- Institute of Pathology, University Hospital Heidelberg, 69120, Heidelberg, Germany
| | - Fabian von Bubnoff
- Institute of Pathology, University Hospital Heidelberg, 69120, Heidelberg, Germany
| | - Teresa Lutz
- Institute of Pathology, University Hospital Heidelberg, 69120, Heidelberg, Germany
| | - Alessandro Ori
- Leibniz Institute on Aging - Fritz Lipmann Institute (FLI), 07745, Jena, Germany
| | - Peter Schirmacher
- Institute of Pathology, University Hospital Heidelberg, 69120, Heidelberg, Germany
| | - Kai Breuhahn
- Institute of Pathology, University Hospital Heidelberg, 69120, Heidelberg, Germany.
| |
Collapse
|
2
|
Baker K, Kirkham S, Halova L, Atkin J, Franz-Wachtel M, Cobley D, Krug K, Maček B, Mulvihill DP, Petersen J. TOR complex 2 localises to the cytokinetic actomyosin ring and controls the fidelity of cytokinesis. J Cell Sci 2016; 129:2613-24. [PMID: 27206859 PMCID: PMC4958305 DOI: 10.1242/jcs.190124] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Accepted: 05/06/2016] [Indexed: 01/30/2023] Open
Abstract
The timing of cell division is controlled by the coupled regulation of growth and division. The target of rapamycin (TOR) signalling network synchronises these processes with the environmental setting. Here, we describe a novel interaction of the fission yeast TOR complex 2 (TORC2) with the cytokinetic actomyosin ring (CAR), and a novel role for TORC2 in regulating the timing and fidelity of cytokinesis. Disruption of TORC2 or its localisation results in defects in CAR morphology and constriction. We provide evidence that the myosin II protein Myp2 and the myosin V protein Myo51 play roles in recruiting TORC2 to the CAR. We show that Myp2 and TORC2 are co-dependent upon each other for their normal localisation to the cytokinetic machinery. We go on to show that TORC2-dependent phosphorylation of actin-capping protein 1 (Acp1, a known regulator of cytokinesis) controls CAR stability, modulates Acp1-Acp2 (the equivalent of the mammalian CAPZA-CAPZB) heterodimer formation and is essential for survival upon stress. Thus, TORC2 localisation to the CAR, and TORC2-dependent Acp1 phosphorylation contributes to timely control and the fidelity of cytokinesis and cell division.
Collapse
Affiliation(s)
- Karen Baker
- School of Biosciences, University of Kent, Giles Lane, Canterbury, Kent CT2 7NJ, UK
| | - Sara Kirkham
- Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester M13 9PT, UK
| | - Lenka Halova
- Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester M13 9PT, UK
| | - Jane Atkin
- Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester M13 9PT, UK
| | | | - David Cobley
- Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester M13 9PT, UK
| | - Karsten Krug
- Proteome Center Tübingen, Auf der Morgenstelle 15, Tübingen 72076, Germany
| | - Boris Maček
- Proteome Center Tübingen, Auf der Morgenstelle 15, Tübingen 72076, Germany
| | - Daniel P Mulvihill
- School of Biosciences, University of Kent, Giles Lane, Canterbury, Kent CT2 7NJ, UK
| | - Janni Petersen
- Faculty of Life Sciences, University of Manchester, Oxford Road, Manchester M13 9PT, UK Flinders Centre for Innovation in Cancer, School of Medicine, Flinders University, Adelaide, SA 5001, Australia South Australia Health and Medical Research Institute, North Terrace, PO Box 11060, Adelaide, SA 5000, Australia
| |
Collapse
|