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Subcellular localization of CIAPIN1

Zhiming Hao1, Xiaohua Li, Taidong Qiao

  • 1State Key Laboratory of Cancer Biology, Institute of Digestive Diseases, Xijing Hospital, The Fourth Military Medical University, Xi'an 710032, Shaanxi Province, China.

The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
|September 8, 2006
PubMed

Insights

Cytokine-induced apoptosis inhibitor 1 (CIAPIN1) is an anti-apoptotic molecule. This study reveals CIAPIN1 localizes to the cytoplasm, nucleus, and nucleolus, suggesting a translocation process.

Area of Science:

  • Cell Biology
  • Molecular Biology

Background:

  • Cytokine-induced apoptosis inhibitor 1 (CIAPIN1) is an identified anti-apoptotic molecule.
  • CIAPIN1 is expressed in human tissues and confers multidrug resistance in gastric cancer.
  • The fundamental biological functions of CIAPIN1 remain largely unelucidated.

Purpose of the Study:

  • To predict and characterize the subcellular localization of CIAPIN1.
  • To investigate the intracellular localization of CIAPIN1 in human and mouse cells.
  • To explore the potential translocation of CIAPIN1 within the cell.

Main Methods:

  • Bioinformatic prediction of subcellular localization.
  • Immunohistochemistry and immunofluorescence assays.
  • His-tagged CIAPIN1 expression and Western blotting analysis of subcellular fractions.

Main Results:

  • Consistent results across all methods indicated CIAPIN1 localization in the cytoplasm and nucleus.
  • CIAPIN1 was observed to accumulate specifically in the nucleolus.
  • Bioinformatic analysis identified putative nuclear localization and export signals in CIAPIN1.

Conclusions:

  • CIAPIN1 is localized in the cytoplasm, nucleus, and nucleolus.
  • The presence of signaling motifs suggests CIAPIN1 undergoes translocation.
  • CIAPIN1 may translocate between the cytoplasm, nucleus, and nucleolus, indicating a dynamic cellular role.

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