Frequent downregulation of LRRC26 by epigenetic alterations is involved in the malignant progression of triple-negative breast cancer

  • Authors:
    • Yoshimasa Miyagawa
    • Yosuke Matsushita
    • Hiromu Suzuki
    • Masato Komatsu
    • Tetsuro Yoshimaru
    • Ryuichiro Kimura
    • Ayako Yanai
    • Junko Honda
    • Akira Tangoku
    • Mitsunori Sasa
    • Yasuo Miyoshi
    • Toyomasa Katagiri
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  • Published online on: March 5, 2018     https://doi.org/10.3892/ijo.2018.4301
  • Pages: 1539-1558
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Abstract

Triple-negative breast cancer (TNBC), defined as breast cancer lacking estrogen- and progesterone‑receptor expression and human epidermal growth factor receptor 2 (HER2) amplification, is a heterogeneous disease. RNA-sequencing analysis of 15 TNBC specimens and The Cancer Genome Atlas-TNBC dataset analysis identified the frequent downregulation of leucine-rich repeat-containing 26 (LRRC26), which negatively regulates nuclear factor-κB (NF-κB) signaling, in TNBC tissues. Quantitative polymerase chain reaction and bisulfite pyrosequencing analyses revealed that LRRC26 was frequently silenced in TNBC tissues and cell lines as a result of promoter methylation. LRRC26 expression was restored by 5-aza-2'-deoxycytidine (5'-aza-dC) treatment in HCC1937 TNBC cells, which lack LRRC26 expression. Notably, small interfering RNA-mediated knockdown of LRRC26 expression significantly enhanced the anchorage-independent growth, invasion and migration of HCC70 cells, whereas ectopic overexpression of LRRC26 in BT20 cells suppressed their invasion and migration. Conversely, neither knockdown nor overexpression of LRRC26 had an effect on cell viability in the absence of tumor necrosis factor-α (TNF-α) stimulation. Meanwhile, overexpression of LRRC26 caused the reduction of TNF-α-mediated NF-κB luciferase reporter activity, whereas depleting LRRC26 expression resulted in the upregulation of TNF-α-mediated NF-κB downstream genes [interleukin-6 (IL-6), IL-8 and C-X-C motif chemokine ligand-1]. Taken together, these findings demonstrate that LRRC26 is frequently downregulated in TNBC due to DNA methylation and that it suppresses the TNF-α-independent anchorage-independent growth, invasion and migration of TNBC cells. Loss of LRRC26 function may be a critical event in the aggressiveness of TNBC cells through a TNF-α/NF-κB-independent mechanism.
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May-2018
Volume 52 Issue 5

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Miyagawa Y, Matsushita Y, Suzuki H, Komatsu M, Yoshimaru T, Kimura R, Yanai A, Honda J, Tangoku A, Sasa M, Sasa M, et al: Frequent downregulation of LRRC26 by epigenetic alterations is involved in the malignant progression of triple-negative breast cancer. Int J Oncol 52: 1539-1558, 2018.
APA
Miyagawa, Y., Matsushita, Y., Suzuki, H., Komatsu, M., Yoshimaru, T., Kimura, R. ... Katagiri, T. (2018). Frequent downregulation of LRRC26 by epigenetic alterations is involved in the malignant progression of triple-negative breast cancer. International Journal of Oncology, 52, 1539-1558. https://doi.org/10.3892/ijo.2018.4301
MLA
Miyagawa, Y., Matsushita, Y., Suzuki, H., Komatsu, M., Yoshimaru, T., Kimura, R., Yanai, A., Honda, J., Tangoku, A., Sasa, M., Miyoshi, Y., Katagiri, T."Frequent downregulation of LRRC26 by epigenetic alterations is involved in the malignant progression of triple-negative breast cancer". International Journal of Oncology 52.5 (2018): 1539-1558.
Chicago
Miyagawa, Y., Matsushita, Y., Suzuki, H., Komatsu, M., Yoshimaru, T., Kimura, R., Yanai, A., Honda, J., Tangoku, A., Sasa, M., Miyoshi, Y., Katagiri, T."Frequent downregulation of LRRC26 by epigenetic alterations is involved in the malignant progression of triple-negative breast cancer". International Journal of Oncology 52, no. 5 (2018): 1539-1558. https://doi.org/10.3892/ijo.2018.4301