The RNA-binding protein TIAR is translocated from the nucleus to the cytoplasm during Fas-mediated apoptotic cell death

Jean Luc Taupin, Qingsheng Tian, Nancy Kedersha, Michael Robertson, Paul Anderson

Research output: Contribution to journalArticle

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Abstract

We have determined the structure, intracellular localization, and tissue distribution of TIAR, a TIA-1-related RNA-binding protein. Two related isoforms of TIAR, migrating at 42 and 50 kDa, are expressed in primate cells. Unlike TIA-1, which is found in the granules of cytotoxic lymphocytes, TIAR is concentrated in the nucleus of hematopoietic and nonhematopoietic cells. Because TIAR can trigger DNA fragmentation in permeabilized thymocytes, it is a candidate effector of apoptotic cell death. Consistent with this possibility, we have found that the expression and intracellular localization of TIAR change dramatically during Fas-mediated apoptosis. TIAR moves from the nucleus to the cytoplasm within 30 min of Fas ligation. Redistribution of TIAR precedes the onset of DNA fragmentation and is not a nonspecific consequence of nuclear disintegration. Cytoplasmic redistribution of TIAR is not observed during cellular activation triggered by mitogens such as concanavalin A or phytohemagglutinin. Our results suggest that cytoplasmic redistribution of TIAR may be a general feature of the apoptotic program.

Original languageEnglish (US)
Pages (from-to)1629-1633
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume92
Issue number5
DOIs
StatePublished - Feb 28 1995
Externally publishedYes

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