Novel splice variants of ING4 and their possible roles in the regulation of cell growth and motility

Motoko Unoki, Jiang Cheng Shen, Zhi Ming Zheng, Curtis C. Harris

研究成果: Contribution to journalArticle査読

83 被引用数 (Scopus)

抄録

The ING4 gene is a candidate tumor suppressor gene that functions in cell proliferation, contact inhibition, and angiogenesis. We identified three novel splice variants of ING4 with differing activities in controlling cell proliferation, cell spreading, and cell migration. ING4_v1 (the longest splice variant), originally identified as ING4, encodes an intact nuclear localization signal (NLS), whereas the other three splice variants (ING4_v2, ING4_v3, and ING4_v4) lack the full NLS, resulting in increased cytoplasmic localization of these proteins. We found that one of the three ING4 variants, ING4_v2, is expressed at the same level as the original ING4 (ING4_v1), suggesting that ING4 variants may have significant biological functions. Growth suppressive effects of the variants that have a partial NLS (ING4_v2 and ING4_v4) were attenuated by a weaker effect of the variants on p21WAF1 promoter activation. ING4_v4 lost cell spreading and migration suppressive effects; on the other hand, ING4_v2 retained a cell migration suppressive effect but lost a cell spreading suppressive effect. Therefore, ING4_v2, which localized primarily into cytoplasm, might have an important role in the regulation of cell migration. We also found that ING4_v4 played dominant-negative roles in the induction of p21WAF1 promoter activation and in the suppression of cell motility by ING4_v1. In addition, ING4 variants had different binding affinities to two cytoplasmic proteins, protein-tyrosine phosphatase, receptor type, f polypeptide (PTPRF), interacting protein (liprin), α1, and G3BP2a. Understanding the functions of the four splice variants may aid in defining their roles in human carcinogenesis.

本文言語英語
ページ(範囲)34677-34686
ページ数10
ジャーナルJournal of Biological Chemistry
281
45
DOI
出版ステータス出版済み - 11 10 2006
外部発表はい

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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