TIMP1 induces CD44 expression and the activation and nuclear translocation of SHP1 during the late centrocyte/post-germinal center B cell differentiation

Young Sik Kim, Dong Wan Seo, Su Kang Kong, Ju Han Lee, Eung Seok Lee, Maryalice Stetler-Stevenson, William G. Stetler-Stevenson

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Tissue inhibitor of metalloproteinase-1 (TIMP1) is a survival factor of germinal center (GC) B cells, and its over-expression is correlated with aggressive B cell lymphomas and classical Hodgkin lymphomas. We previously demonstrated that TIMP1 down-regulates B-cell receptor and BCL6, and activates interleukins-6,-10 (ILs)/signal transducer and activator of transcription-3 (STAT3) signaling in GC B cells. The activation of ILs/STAT3 signaling can amplify CD44 function, and vice versa, and induce protein-tyrosine phosphatase SHP1 activity by a negative feedback mechanism. Here, we show that TIMP1 up-regulates cell surface CD44 (standard and variants 3 and 7-10) and induces the activity and nuclear localization of SHP1 in an Epstein Barr virus (EBV)-negative Burkitt lymphoma cell line, the neoplastic counterpart of GC centroblasts. These results suggest that TIMP1 functions as a differentiating and survival factor of GC B cells by modulating CD44 and SHP1 in the late centrocyte/post-GC stage, regardless of EBV infection.

Original languageEnglish
Pages (from-to)37-45
Number of pages9
JournalCancer letters
Volume269
Issue number1
DOIs
Publication statusPublished - 2008 Sep 28

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Keywords

  • CD44
  • Hodgkin lymphoma
  • SHP1
  • TIMP1

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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