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Traynor S, Jakobsen ND, Ebbesen MF, Bennedsen SN, Johansen S, Ebstrup ML, Pedersen CB, Ditzel HJ, Brewer JR, Gjerstorff MF. SSX2 promotes the formation of a novel type of intranuclear lamin bodies. Int J Biochem Cell Biol 2021; 142:106121. [PMID: 34808373 DOI: 10.1016/j.biocel.2021.106121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 09/13/2021] [Revised: 10/22/2021] [Accepted: 11/15/2021] [Indexed: 11/17/2022]
Abstract
SSX proteins are normally restricted to spermatogenic cells, but ectopic expression can be observed in many types of human cancer. We recently demonstrated that SSX family members may contribute to tumorigenesis by modifying chromatin structure and, in specific settings, compromise chromatin stability. Here, we used normal and tumorigenic breast epithelial cell line models to further study the effect of ectopic expression of SSX2 on nuclear organization. We show that SSX2 induces the formation of a novel type of nucleoplasmic lamin bodies. Ectopic expression of SSX2 in various breast epithelial cell lines led to the formation of a previously undescribed type of intranuclear bodies containing both A and B type lamins but no other components of the nuclear lamina. SSX2-expressing cells contained a highly variable number of lamin bodies distributed throughout the nuclear space. SSX2-mediated establishment of intranuclear lamin bodies could not be linked to previous molecular interactions of SSX proteins, including polycomb proteins and the Mediator complex, but was, however, dependent on S-phase progression. These results reveal a novel interaction between SSX2 and lamins in the nucleoplasmic space. They further suggest that SSX2 promotes the formation of chromatin neighborhoods supporting the organization of lamins into nuclear bodies. We speculate that this may have implications for the organization and functional regulation of chromatin in cancer cells. Our study contributes to the further understanding of the biology of SSX proteins in tumorigenesis.
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Affiliation(s)
- S Traynor
- Department of Cancer and Inflammation Research, Institute for Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - N D Jakobsen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - M F Ebbesen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - S N Bennedsen
- Department of Cancer and Inflammation Research, Institute for Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - S Johansen
- Department of Cancer and Inflammation Research, Institute for Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - M L Ebstrup
- Department of Cancer and Inflammation Research, Institute for Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - C B Pedersen
- Department of Cancer and Inflammation Research, Institute for Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - H J Ditzel
- Department of Cancer and Inflammation Research, Institute for Molecular Medicine, University of Southern Denmark, Odense, Denmark; Department of Oncology, Odense University Hospital, Odense, Denmark; Academy of Geriatric Cancer Research (AgeCare), Odense University Hospital, Odense, Denmark
| | - J R Brewer
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
| | - Morten F Gjerstorff
- Department of Cancer and Inflammation Research, Institute for Molecular Medicine, University of Southern Denmark, Odense, Denmark; Department of Oncology, Odense University Hospital, Odense, Denmark; Academy of Geriatric Cancer Research (AgeCare), Odense University Hospital, Odense, Denmark.
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Traynor S. Handbook of Local AnesthesiaS. F. Malamed Mosby, ISBN 978-0323074131, 432 pp., Price £55.99. Anaesthesia 2013. [DOI: 10.1111/anae.12462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Traynor S, Adams JR, Andersen P, Everts E, Cohen J. Appropriate timing and velocity of infusion for the selective staining of parathyroid glands by intravenous methylene blue. Am J Surg 1998; 176:15-7. [PMID: 9683125 DOI: 10.1016/s0002-9610(98)00100-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND Intraoperative parathyroid gland (PTG) identification by selective staining using methylene blue dye (MB) infusion has been shown effective but the degree of gland staining is inconsistent. METHODS The effect of timing and rate of MB infusion on gland uptake was investigated in a canine model by infusing MB either rapidly over 3 to 5 minutes (n = 8) or slowly over 30 minutes (n = 4). The pattern of dye uptake in an exposed PTG was determined by standardized serial photography. RESULTS Earliest uptake occurred between 10 and 20 minutes after infusion, and maximum uptake averaged 21 minutes, earlier than previously described. Rate of infusion did not affect staining. CONCLUSIONS This rapid uptake of methylene blue by the parathyroid glands suggests that its selective intraoperative use when glands are difficult to locate intraoperatively, rather than a routine preoperative infusion, is possible without significant operative delay. Clinical experience has confirmed this impression.
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Affiliation(s)
- S Traynor
- Department of Otolaryngology/Head and Neck Surgery, Oregon Health Sciences University, Portland, USA
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