1
|
Luthold C, Lambert H, Guilbert SM, Rodrigue MA, Fuchs M, Varlet AA, Fradet-Turcotte A, Lavoie JN. CDK1-Mediated Phosphorylation of BAG3 Promotes Mitotic Cell Shape Remodeling and the Molecular Assembly of Mitotic p62 Bodies. Cells 2021; 10:cells10102638. [PMID: 34685619 PMCID: PMC8534064 DOI: 10.3390/cells10102638] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Revised: 09/22/2021] [Accepted: 09/27/2021] [Indexed: 01/07/2023] Open
Abstract
The cochaperone BCL2-associated athanogene 3 (BAG3), in complex with the heat shock protein HSPB8, facilitates mitotic rounding, spindle orientation, and proper abscission of daughter cells. BAG3 and HSPB8 mitotic functions implicate the sequestosome p62/SQSTM1, suggesting a role for protein quality control. However, the interplay between this chaperone-assisted pathway and the mitotic machinery is not known. Here, we show that BAG3 phosphorylation at the conserved T285 is regulated by CDK1 and activates its function in mitotic cell shape remodeling. BAG3 phosphorylation exhibited a high dynamic at mitotic entry and both a non-phosphorylatable BAG3T285A and a phosphomimetic BAG3T285D protein were unable to correct the mitotic defects in BAG3-depleted HeLa cells. We also demonstrate that BAG3 phosphorylation, HSPB8, and CDK1 activity modulate the molecular assembly of p62/SQSTM1 into mitotic bodies containing K63 polyubiquitinated chains. These findings suggest the existence of a mitotically regulated spatial quality control mechanism for the fidelity of cell shape remodeling in highly dividing cells.
Collapse
Affiliation(s)
- Carole Luthold
- Centre de Recherche sur le Cancer, Université Laval, Quebec, QC G1R 3S3, Canada; (C.L.); (H.L.); (S.M.G.); (M.-A.R.); (M.F.); (A.-A.V.); (A.F.-T.)
- Oncology, Centre de Recherche du CHU de Québec-Université Laval, Hôtel-Dieu de Québec, Quebec, QC G1R 3S3, Canada
| | - Herman Lambert
- Centre de Recherche sur le Cancer, Université Laval, Quebec, QC G1R 3S3, Canada; (C.L.); (H.L.); (S.M.G.); (M.-A.R.); (M.F.); (A.-A.V.); (A.F.-T.)
- Oncology, Centre de Recherche du CHU de Québec-Université Laval, Hôtel-Dieu de Québec, Quebec, QC G1R 3S3, Canada
| | - Solenn M. Guilbert
- Centre de Recherche sur le Cancer, Université Laval, Quebec, QC G1R 3S3, Canada; (C.L.); (H.L.); (S.M.G.); (M.-A.R.); (M.F.); (A.-A.V.); (A.F.-T.)
- Oncology, Centre de Recherche du CHU de Québec-Université Laval, Hôtel-Dieu de Québec, Quebec, QC G1R 3S3, Canada
| | - Marc-Antoine Rodrigue
- Centre de Recherche sur le Cancer, Université Laval, Quebec, QC G1R 3S3, Canada; (C.L.); (H.L.); (S.M.G.); (M.-A.R.); (M.F.); (A.-A.V.); (A.F.-T.)
- Oncology, Centre de Recherche du CHU de Québec-Université Laval, Hôtel-Dieu de Québec, Quebec, QC G1R 3S3, Canada
| | - Margit Fuchs
- Centre de Recherche sur le Cancer, Université Laval, Quebec, QC G1R 3S3, Canada; (C.L.); (H.L.); (S.M.G.); (M.-A.R.); (M.F.); (A.-A.V.); (A.F.-T.)
- Oncology, Centre de Recherche du CHU de Québec-Université Laval, Hôtel-Dieu de Québec, Quebec, QC G1R 3S3, Canada
| | - Alice-Anaïs Varlet
- Centre de Recherche sur le Cancer, Université Laval, Quebec, QC G1R 3S3, Canada; (C.L.); (H.L.); (S.M.G.); (M.-A.R.); (M.F.); (A.-A.V.); (A.F.-T.)
- Oncology, Centre de Recherche du CHU de Québec-Université Laval, Hôtel-Dieu de Québec, Quebec, QC G1R 3S3, Canada
| | - Amélie Fradet-Turcotte
- Centre de Recherche sur le Cancer, Université Laval, Quebec, QC G1R 3S3, Canada; (C.L.); (H.L.); (S.M.G.); (M.-A.R.); (M.F.); (A.-A.V.); (A.F.-T.)
- Oncology, Centre de Recherche du CHU de Québec-Université Laval, Hôtel-Dieu de Québec, Quebec, QC G1R 3S3, Canada
- Département de Biologie Moléculaire, Biochimie Médicale et Pathologie, Faculté de Médecine, Université Laval, Quebec, QC G1V0A6, Canada
| | - Josée N. Lavoie
- Centre de Recherche sur le Cancer, Université Laval, Quebec, QC G1R 3S3, Canada; (C.L.); (H.L.); (S.M.G.); (M.-A.R.); (M.F.); (A.-A.V.); (A.F.-T.)
- Oncology, Centre de Recherche du CHU de Québec-Université Laval, Hôtel-Dieu de Québec, Quebec, QC G1R 3S3, Canada
- Département de Biologie Moléculaire, Biochimie Médicale et Pathologie, Faculté de Médecine, Université Laval, Quebec, QC G1V0A6, Canada
- Correspondence:
| |
Collapse
|
2
|
Luthold C, Varlet AA, Lambert H, Bordeleau F, Lavoie JN. Chaperone-Assisted Mitotic Actin Remodeling by BAG3 and HSPB8 Involves the Deacetylase HDAC6 and Its Substrate Cortactin. Int J Mol Sci 2020; 22:ijms22010142. [PMID: 33375626 PMCID: PMC7795263 DOI: 10.3390/ijms22010142] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 12/18/2020] [Accepted: 12/23/2020] [Indexed: 12/17/2022] Open
Abstract
The fidelity of actin dynamics relies on protein quality control, but the underlying molecular mechanisms are poorly defined. During mitosis, the cochaperone BCL2-associated athanogene 3 (BAG3) modulates cell rounding, cortex stability, spindle orientation, and chromosome segregation. Mitotic BAG3 shows enhanced interactions with its preferred chaperone partner HSPB8, the autophagic adaptor p62/SQSTM1, and HDAC6, a deacetylase with cytoskeletal substrates. Here, we show that depletion of BAG3, HSPB8, or p62/SQSTM1 can recapitulate the same inhibition of mitotic cell rounding. Moreover, depletion of either of these proteins also interfered with the dynamic of the subcortical actin cloud that contributes to spindle positioning. These phenotypes were corrected by drugs that limit the Arp2/3 complex or HDAC6 activity, arguing for a role for BAG3 in tuning branched actin network assembly. Mechanistically, we found that cortactin acetylation/deacetylation is mitotically regulated and is correlated with a reduced association of cortactin with HDAC6 in situ. Remarkably, BAG3 depletion hindered the mitotic decrease in cortactin–HDAC6 association. Furthermore, expression of an acetyl-mimic cortactin mutant in BAG3-depleted cells normalized mitotic cell rounding and the subcortical actin cloud organization. Together, these results reinforce a BAG3′s function for accurate mitotic actin remodeling, via tuning cortactin and HDAC6 spatial dynamics.
Collapse
Affiliation(s)
- Carole Luthold
- Centre de Recherche sur le Cancer, Université Laval, Québec, QC G1R 3S3, Canada; (C.L.); (A.-A.V.); (H.L.)
- Oncology, Centre de Recherche du CHU de Québec-Université Laval, Hôtel-Dieu de Québec, Québec, QC G1R 3S3, Canada
| | - Alice-Anaïs Varlet
- Centre de Recherche sur le Cancer, Université Laval, Québec, QC G1R 3S3, Canada; (C.L.); (A.-A.V.); (H.L.)
- Oncology, Centre de Recherche du CHU de Québec-Université Laval, Hôtel-Dieu de Québec, Québec, QC G1R 3S3, Canada
| | - Herman Lambert
- Centre de Recherche sur le Cancer, Université Laval, Québec, QC G1R 3S3, Canada; (C.L.); (A.-A.V.); (H.L.)
- Oncology, Centre de Recherche du CHU de Québec-Université Laval, Hôtel-Dieu de Québec, Québec, QC G1R 3S3, Canada
| | - François Bordeleau
- Centre de Recherche sur le Cancer, Université Laval, Québec, QC G1R 3S3, Canada; (C.L.); (A.-A.V.); (H.L.)
- Oncology, Centre de Recherche du CHU de Québec-Université Laval, Hôtel-Dieu de Québec, Québec, QC G1R 3S3, Canada
- Département de Biologie Moléculaire, Biochimie Médicale et Pathologie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
- Correspondence: (F.B.); (J.N.L.)
| | - Josée N. Lavoie
- Centre de Recherche sur le Cancer, Université Laval, Québec, QC G1R 3S3, Canada; (C.L.); (A.-A.V.); (H.L.)
- Oncology, Centre de Recherche du CHU de Québec-Université Laval, Hôtel-Dieu de Québec, Québec, QC G1R 3S3, Canada
- Département de Biologie Moléculaire, Biochimie Médicale et Pathologie, Faculté de Médecine, Université Laval, Québec, QC G1V 0A6, Canada
- Correspondence: (F.B.); (J.N.L.)
| |
Collapse
|
3
|
Varlet AA, Fuchs M, Luthold C, Lambert H, Landry J, Lavoie JN. Fine-tuning of actin dynamics by the HSPB8-BAG3 chaperone complex facilitates cytokinesis and contributes to its impact on cell division. Cell Stress Chaperones 2017; 22:553-567. [PMID: 28275944 PMCID: PMC5465032 DOI: 10.1007/s12192-017-0780-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Revised: 02/13/2017] [Accepted: 02/14/2017] [Indexed: 11/28/2022] Open
Abstract
The small heat shock protein HSPB8 and its co-chaperone BAG3 are proposed to regulate cytoskeletal proteostasis in response to mechanical signaling in muscle cells. Here, we show that in dividing cells, the HSPB8-BAG3 complex is instrumental to the accurate disassembly of the actin-based contractile ring during cytokinesis, a process required to allow abscission of daughter cells. Silencing of HSPB8 markedly decreased the mitotic levels of BAG3 in HeLa cells, supporting its crucial role in BAG3 mitotic functions. Cells depleted of HSPB8 were delayed in cytokinesis, remained connected via a disorganized intercellular bridge, and exhibited increased incidence of nuclear abnormalities that result from failed cytokinesis (i.e., bi- and multi-nucleation). Such phenotypes were associated with abnormal accumulation of F-actin at the intercellular bridge of daughter cells at telophase. Remarkably, the actin sequestering drug latrunculin A, like the inhibitor of branched actin polymerization CK666, normalized F-actin during cytokinesis and restored proper cell division in HSPB8-depleted cells, implicating deregulated actin dynamics as a cause of abscission failure. Moreover, this HSPB8-dependent phenotype could be corrected by rapamycin, an autophagy-promoting drug, whereas it was mimicked by drugs impairing lysosomal function. Together, the results further support a role for the HSPB8-BAG3 chaperone complex in quality control of actin-based structure dynamics that are put under high tension, notably during cell cytokinesis. They expand a so-far under-appreciated connection between selective autophagy and cellular morphodynamics that guide cell division.
Collapse
Affiliation(s)
- Alice Anaïs Varlet
- Centre de recherche sur le cancer de l'Université Laval, Québec, Canada
- Oncology, Centre de recherche du CHU de Québec-Université Laval, Québec, G1R 3S3, Canada
| | - Margit Fuchs
- Centre de recherche sur le cancer de l'Université Laval, Québec, Canada
- Oncology, Centre de recherche du CHU de Québec-Université Laval, Québec, G1R 3S3, Canada
| | - Carole Luthold
- Centre de recherche sur le cancer de l'Université Laval, Québec, Canada
- Oncology, Centre de recherche du CHU de Québec-Université Laval, Québec, G1R 3S3, Canada
| | - Herman Lambert
- Centre de recherche sur le cancer de l'Université Laval, Québec, Canada
- Oncology, Centre de recherche du CHU de Québec-Université Laval, Québec, G1R 3S3, Canada
| | - Jacques Landry
- Centre de recherche sur le cancer de l'Université Laval, Québec, Canada
- Oncology, Centre de recherche du CHU de Québec-Université Laval, Québec, G1R 3S3, Canada
- Département de Biologie Moléculaire, Biochimie Médicale et Pathologie Université Laval, Québec, G1V OA6, Canada
| | - Josée N Lavoie
- Centre de recherche sur le cancer de l'Université Laval, Québec, Canada.
- Oncology, Centre de recherche du CHU de Québec-Université Laval, Québec, G1R 3S3, Canada.
- Département de Biologie Moléculaire, Biochimie Médicale et Pathologie Université Laval, Québec, G1V OA6, Canada.
| |
Collapse
|