| 1. |
- Andersson, Mattias K, 1979, et al.
(författare)
-
The multifunctional FUS, EWS and TAF15 proto-oncoproteins show cell type-specific expression patterns and involvement in cell spreading and stress response
- 2008
-
Ingår i: BMC Cell Biology. - : Springer Science and Business Media LLC. - 1471-2121. ; 9
-
Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: FUS, EWS and TAF15 are structurally similar multifunctional proteins that were first discovered upon characterization of fusion oncogenes in human sarcomas and leukemias. The proteins belong to the FET (previously TET) family of RNA-binding proteins and are implicated in central cellular processes such as regulation of gene expression, maintenance of genomic integrity and mRNA/microRNA processing. In the present study, we investigated the expression and cellular localization of FET proteins in multiple human tissues and cell types. RESULTS: FUS, EWS and TAF15 were expressed in both distinct and overlapping patterns in human tissues. The three proteins showed almost ubiquitous nuclear expression and FUS and TAF15 were in addition present in the cytoplasm of most cell types. Cytoplasmic EWS was more rarely detected and seen mainly in secretory cell types. Furthermore, FET expression was downregulated in differentiating human embryonic stem cells, during induced differentiation of neuroblastoma cells and absent in terminally differentiated melanocytes and cardiac muscle cells. The FET proteins were targeted to stress granules induced by heat shock and oxidative stress and FUS required its RNA-binding domain for this translocation. Furthermore, FUS and TAF15 were detected in spreading initiation centers of adhering cells. CONCLUSION: Our results point to cell-specific expression patterns and functions of the FET proteins rather than the housekeeping roles inferred from earlier studies. The localization of FET proteins to stress granules suggests activities in translational regulation during stress conditions. Roles in central processes such as stress response, translational control and adhesion may explain the FET proteins frequent involvement in human cancer.
|
|
| 2. |
|
|
| 3. |
- Persson, Fredrik, 1973, et al.
(författare)
-
Characterization of the 12q amplicons by high-resolution, oligonucleotide array CGH and expression analyses of a novel liposarcoma cell line
- 2008
-
Ingår i: Cancer Letters. - : Elsevier BV. - 0304-3835. ; 260:1-2, s. 37-47
-
Tidskriftsartikel (refereegranskat)abstract
- The cytogenetic hallmark of well-differentiated liposarcoma (WDLS) is a giant marker chromosomes containing amplified genes from chromosome 12q13-q15. Here, we have employed SKY and high-resolution 244K oligonucleotide array CGH to characterize rearrangements and amplifications in a new WDLS cell line (GOT3) with a giant marker chromosome derived from chromosomes 12, 1, and X. The most prominent amplifications included 144 genes in 12q11-q21.2, 201 genes in 1q23.3-q44, and six genes in 13q32.1-q32.2. In the 12q amplicons, MDM2 showed the highest level of amplification followed by LYZ, HMGA2 (5'-part), TSPAN8, CNOT2, YEATS4, CDK4, GNS, HELB, and TSFM. Expression analysis of genes from the three major amplicons revealed that several highly amplified potential target genes, including HMGA2, MDM2, YEATS4, CDK4, PKP1, IPO9, and SOX21, were strongly overexpressed. Studies of cell cycle controlling proteins that interact with CDK4 and MDM2 revealed an abnormally strong expression of cyclins D1 and E. The selective high-level amplification of the 5'-part of HMGA2, including the DNA-binding domains, suggests that this gene is a major target of amplifications in WDLS. Our results also identify several novel candidate genes of potential pathogenetic and therapeutic importance for WDLS.
|
|
| 4. |
|
|
| 5. |
- Andersson, Mattias K, 1979, et al.
(författare)
-
Proliferation of Ewing sarcoma cell lines is suppressed by the receptor tyrosine kinase inhibitors gefitinib and vandetanib
- 2008
-
Ingår i: Cancer Cell International. - : Springer Science and Business Media LLC. - 1475-2867. ; 8:1
-
Tidskriftsartikel (refereegranskat)abstract
- ABSTRACT: BACKGROUND: Tyrosine kinase inhibitors (TKIs) have gained much attention in recent years as targeted agents for the treatment of a wide range of human cancers. We have investigated the effect of the TKIs gefitinib and vandetanib on tumor cell lines derived from Ewing sarcoma, a highly malignant tumor affecting bone and soft tissue in children and young adults. Gefitinib is an inhibitor of epidermal growth factor receptor tyrosine kinase activity (EGFR) and vandetanib selectively targets vascular endothelial growth factor receptor-2 (VEGFR-2) with additional activity against VEGFR-3, EGFR and RET kinase receptors. RESULTS: Two Ewing sarcoma cell lines investigated showed high levels of nuclear EGFR expression as well as moderate expression in plasma membrane and cytoplasm. When treated with concentrations of 5 muM and more of either gefitinib or vandetanib, we observed a significant decrease in cell proliferation. However, there were no detectable changes in p44/42 MAPK and Akt-1 phosphorylation, or in the expression of cyclin D1 or c-Myc following gefitinib or vandetanib treatment. CONCLUSION: We conclude that Ewing sarcoma tumor cell proliferation is not highly sensitive to inhibition of EGFR signaling alone or the simultaneous inhibition of VEGFR receptors, EGFR and RET kinase. Decreased tumor cell proliferation could be achieved with gefitinib and vandetanib, but only at higher doses where non-specific effects of the compounds may be overriding. As Ewing tumor cells do not seem to depend on EGFR and VEGFR pathways for survival, other key factors in the cellular signaling of Ewing sarcoma should be targeted in order to obtain a potent therapeutic response.
|
|
| 6. |
- Andersson, Mattias K, 1979, et al.
(författare)
-
Skadade stamceller ger cancer hos unga
- 2005
-
Ingår i: Forskning & Framsteg. - 0015-7937. ; 40:7, s. 19-21
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Cancer är vanligen en ålderssjukdom, men när kontrollgener i stamceller skadas tidigt under utvecklingen kan även unga få cancer. Sådana förändringar ligger bakom exempelvis barnleukemi.
|
|
| 7. |
|
|
| 8. |
|
|
| 9. |
- Bento, Christoffer, et al.
(författare)
-
DDIT3/CHOP and the sarcoma fusion oncoprotein FUS-DDIT3/TLS-CHOP bind cyclin-dependent kinase 2.
- 2009
-
Ingår i: BMC cell biology. - : Springer Science and Business Media LLC. - 1471-2121. ; 10:1
-
Tidskriftsartikel (refereegranskat)abstract
- ABSTRACT: BACKGROUND: The DDIT3 gene encodes a transcription factor belonging to the CCAAT/enhancer binding protein (C/EBP) family. It is normally expressed at very low levels but is activated by cellular stress conditions and induces G1-arrest and, in some cell types, apoptosis. DDIT3 is found as a part of the fusion oncogene FUS-DDIT3 that is causal for the development of myxoid/round-cell liposarcomas (MLS/RCLS). RESULTS: In the present study, we searched for putative interaction partners of DDIT3 and the oncogenic FUS-DDIT3 among G1 cyclins and cyclin-dependent kinases. We found that FUS-DDIT3 and the normal DDIT3 bind CDK2. In addition, CDK2 showed an increased affinity for cytoskeletal proteins in cells expressing FUS-DDIT3 and DDIT3. CONCLUSIONS: We conclude that DDIT3 binds CDK2 and that many of the observed biological effects of DDIT3 may involve interaction with CDK2.
|
|
| 10. |
- Engström, Katarina, 1956, et al.
(författare)
-
Irradiation of myxoid/round cell liposarcoma induces volume reduction and lipoma-like morphology
- 2007
-
Ingår i: Acta Oncologica. - : Informa UK Limited. - 0284-186X .- 1651-226X. ; 46:6, s. 838-845
-
Tidskriftsartikel (refereegranskat)abstract
- The aim of the study was to investigate the clinical and morphological effects of radiotherapy in the treatment of myxoid/round cell liposarcoma (MLS/RCLS). Thirty-three primary and metastatic MLS/RCLS tumours in 15 patients were treated with radiation therapy. Twenty-seven of the 33 tumours were surgically removed after preoperative radiation (34-46 Gy) while six tumours were treated with radiotherapy alone (44-60 Gy). The pretreatment diagnosis was established in all 15 patients based on fine needle aspirates or histological findings. Tumour size was measured by CT or MRI before and after radiotherapy in 30 tumours. Thirteen tumours from 11 patients were genetically characterised before and/or after radiation therapy. Twenty-three of 30 irradiated tumours showed a median reduction in tumour volume of 52% and seven lesions a median progression of 36%. All 27 surgically removed tumours revealed histological features of radiation response. The most striking morphological changes were lipoma-like appearance, paucicellularity and hyalinisation. Twelve of 13 tumours analysed before and/or after radiation therapy showed the FUS-DDIT3 translocation. Radiation therapy of MLS/RCLS induces histopathologic accumulation of mature lipoma-like areas and tumour volume reduction that may facilitate resectability.
|
|
