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The forkhead box M1 (FOXM1) expression and antitumor effect of FOXM1 inhibition in malignant rhabdoid tumor

  • Original Article – Clinical Oncology
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Abstract

Purpose

Malignant rhabdoid tumor (MRT) is a rare, highly aggressive sarcoma with an uncertain cell of origin. Despite the existing standard of intensive multimodal therapy, the prognosis of patients with MRT is very poor. Novel antitumor agents are needed for MRT patients. Forkhead box transcription factor 1 (FOXM1) is overexpressed and is correlated with the pathogenesis in several human malignancies. In this study, we identified the clinicopathological and prognostic values of the expression of FOXM1 and its roles in the progression of MRT.

Methods

We investigated the FOXM1 expression levels and their clinical significance in 23 MRT specimens using immunohistochemistry and performed clinicopathologic and prognostic analyses. We also demonstrated correlations between the downregulation of FOXM1 and oncological characteristics using small interfering RNA (siRNA) and FOXM1 inhibitor in MRT cell lines.

Results

Histopathological analyses revealed that primary renal MRTs showed significantly low FOXM1 protein expression levels (p = 0.032); however, there were no significant differences in other clinicopathological characteristics or the survival rate. FOXM1 siRNA and FOXM1 inhibitor (thiostrepton) successfully downregulated the mRNA and protein expression of FOXM1 in vitro and the downregulation of FOXM1 inhibited cell proliferation, drug resistance to chemotherapeutic agents, migration, invasion, and caused the cell cycle arrest and apoptosis of MRT cell lines. A cDNA microarray analysis showed that FOXM1 regulated FANCD2 and NBS1, which are key genes for DNA damage repair.

Conclusion

This study demonstrates that FOXM1 may serve as a promising therapeutic target for MRT.

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Abbreviations

MRT:

Malignant rhabdoid tumor

MRTK:

MRT of the kidney

EMRT:

Extra-renal non-cranial MRT

AT/RT:

Atypical teratoid/rhabdoid tumor

ATP:

Adenosine triphosphate

CDK:

Cyclin-dependent kinase

RB:

Retinoblastoma

MYC:

C-avian myelocytomatosis viral oncogene homolog hemoglobin

FOXM1:

Forkhead box protein M1

DOX:

Doxorubicin

FANCD2:

Fanconi anemia complementation group D2

NBS1:

Nijmegen breakage syndrome 1

ATM:

Ataxia-telangiectasia mutated

IHC:

Immunohistochemical

FBS:

Fetal bovine serum

siRNA:

Small interfering RNA

qRT-PCR:

Quantitative real-time polymerase chain reaction

ANOVA:

Analysis of variance

PI:

Propidium iodide

ATR:

ATM and RAD3-related

IR:

Ionizing radiation

H2AX:

H2A histone family member X

FAN1:

Fanconi-associated nuclease 1

Pol Eta:

DNA polymerase eta

BRCA1:

Breast cancer susceptibility gene 1

MRE11:

Meiotic recombination 11

RAD50:

DNA repair protein RAD50

DSB:

DNA double-strand break

HRR:

Homologous recombination repair

NHEJ:

Non-homologous end joining

References

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Acknowledgements

The authors thank to Maiko Takahashi (Kamakura Techno-Science, Inc.) for her invaluable assistance with the 3D-Gene analysis and the technical assistance from The Research Support Center, Research Center for Human Disease Modeling, Kyushu University Graduate School of Medical Sciences.

Funding

This study was supported by the Japan Society for the Promotion of Science KAKENHI grants, (JP19H03444).

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Authors

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Correspondence to Yoshinao Oda.

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Conflict of interest

The authors declare no conflicts of interest in association with the present study.

Ethics approval

This study was approved by the institutional review board at Kyushu University (permission code 29-429,29-625).

Informed consent

Informed consent was obtained from all participants included in this study.

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Shibui, Y., Kohashi, K., Tamaki, A. et al. The forkhead box M1 (FOXM1) expression and antitumor effect of FOXM1 inhibition in malignant rhabdoid tumor. J Cancer Res Clin Oncol 147, 1499–1518 (2021). https://doi.org/10.1007/s00432-020-03438-w

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  • DOI: https://doi.org/10.1007/s00432-020-03438-w

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