Regulation of Cathepsin E gene expression by the transcription factor Kaiso in MRL/lpr mice derived CD4+ T cells

Sumie Hiramatsu, Katsue S. Watanabe, Sonia Zeggar, Yosuke Asano, Yoshia Miyawaki, Yuriko Yamamura, Eri Katsuyama, Takayuki Katsuyama, Haruki Watanabe, Mariko Takano-Narazaki, Yoshinori Matsumoto, Tomoko Kawabata, Kenei Sada, Jun Wada

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Abstract

Global DNA hypomethylation in CD4+ cells in systemic lupus erythematosus (SLE) was suggested to play a key role in the pathogenesis. To identify new methylation-sensitive genes, we integrated genome-wide DNA methylation and mRNA profiling data in CD4+ cells of MRL/lpr (MRL) and C57BL6/J (B6) mice. We identified Cathepsin E (Ctse), in which 13 methyl-CpGs within 583 bp region of intron 1 were hypomethylated, and Ctse mRNA upregulated in MRL compared with B6 mice. One of methyl-CpGs, mCGCG was 93.3 ± 2.05% methylated in B6 mice, while 80.0 ± 6.2% methylated and mutated to CGGG in MRL mice. Kaiso is known to bind to mCGCG and we hypothesized that it represses expression of Ctse in B6 mice. The binding of Kaiso to mCGCG site in B6 mice was reduced in MRL mice revealed by ChIP-PCR. EL4 cells treated with 5-azaC and/or Trichostatin A showed the suppression of binding of Kaiso to mCGCG motif by ChIP-PCR and the overexpression of Ctse was demonstrated by qPCR. Ctse gene silencing by siRNA in EL4 cells resulted in reduction of IL-10 secretion. The hypomethylation of mCGCG motif, reduced recruitment of Kaiso, and increased expression of Ctse and Il-10 in CD4+ cells may be involved in the pathogenesis of SLE.

Original languageEnglish
Article number3054
Pages (from-to)3054
JournalScientific reports
Volume9
Issue number1
DOIs
Publication statusPublished - Feb 28 2019

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Hiramatsu, S., Watanabe, K. S., Zeggar, S., Asano, Y., Miyawaki, Y., Yamamura, Y., Katsuyama, E., Katsuyama, T., Watanabe, H., Takano-Narazaki, M., Matsumoto, Y., Kawabata, T., Sada, K., & Wada, J. (2019). Regulation of Cathepsin E gene expression by the transcription factor Kaiso in MRL/lpr mice derived CD4+ T cells. Scientific reports, 9(1), 3054. [3054]. https://doi.org/10.1038/s41598-019-38809-y