ZNF385B is characteristically expressed in germinal center B cells and involved in B-cell apoptosis

Kazutoshi Iijima, Hiroyuki Yamada, Masashi Miharu, Ken Ichi Imadome, Yoshitaka Miyagawa, Shingo Akimoto, Kenichiro Kobayashi, Hajime Okita, Atsuko Nakazawa, Shigeyoshi Fujiwara, Junichiro Fujimoto, Nobutaka Kiyokawa

研究成果: Article査読

10 被引用数 (Scopus)

抄録

We previously identified zinc finger (ZF) protein ZNF385B as a molecule specifically expressed in Burkitt's lymphoma (BL) among hematologic malignancies. Here, we investigated ZNF385B expression in healthy B cells in a variety of hematological tissues by RT-PCR and immunohistochemistry. ZNF385B expression was found to be limited to a subset of GC B cells, the healthy counterpart to BL B cells. To elucidate the function of ZNF385B in healthy B cells, we established a tetracycline-controlled protein-inducible system in B-cell lines and observed that ectopic expression of the longest transcript variant of ZNF385B, possessing four ZF domains, induced upregulation of PERP and FAS/CD95, a downstream target of p53, and activation of caspase, resulting in apoptosis induction. However, a ZNF385B deletion mutant with three ZF domains corresponding to shorter isoforms, did not induce upregulation; rather it inhibited apoptosis induced by CD20 cross-linking and BCR stimulation. The direct binding of ZNF385B with p53 has suggested the involvement of ZNF385B in B-cell apoptosis via modulation of p53 transactivation; our data indicate that ZNF385B characteristically expressed in GC B cells has both proapoptotic and antiapoptotic activities depending on the type of isoform and should be a novel player in GC B-cell selection.

本文言語English
ページ(範囲)3405-3415
ページ数11
ジャーナルEuropean Journal of Immunology
42
12
DOI
出版ステータスPublished - 2012 12
外部発表はい

ASJC Scopus subject areas

  • 免疫アレルギー学
  • 免疫学

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