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Expression and distribution of HSP27 in response to G418 in different human breast cancer cell lines

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Abstract

Heat shock proteins (HSPs) play an important role in folding, intracellular localization and degradation of cellular proteins. However, the cellular role of HSP27 is not completely understood. The conflicting results have been reported regarding stress-induced nuclear translocation of HSP27. In this study, human breast cancer cells transiently and stably expressing HSP27–EGFP chimera were utilized to observe the intracellular localization of HSP27. The data show that the transient and stable expression of HSP27–EGFP displayed distinguishingly cellular localization. The nuclear translocalization of HSP27–EGFP was correlated with the presence of G418. Experiments carried out with different human breast cancer cell lines revealed clearly different distribution patterns of endogenous HSP27. The subcellular distribution of endogenous HSP27 appeared diffuse throughout the cytoplasm in MDA435 cells. In MCF-7 and SKBR3 cells, the accumulation of the protein was distinctly seen along the cell membrane and around nucleus. Moreover, the nuclear translocation of endogenous HSP27 was stimulated by G418 only in MDA435 cells, but not in MCF-7 and SKBR3 cells. Overexpression of HSP27 has been associated with resistance to cisplatin and doxorubicin. The correlation of the expression pattern of HSP27 with the drug resistance may need to be investigated. Further studies on the intracellular function of HSP27 may take into account its interaction proteins in the cells. It may provide useful information for the identification of sensitivity of carcinoma cells to the chemotherapeutic drugs and development of more specific agents to circumvent HSP27.

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Acknowledgment

This work was supported by Beijing Natural Science Foundation (No. 7051006).

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Authors and Affiliations

  1. Department of Cellular Immunology, Institute of Basic Medical Sciences, Taiping Road 27, Beijing, 100850, People’s Republic of China

    Lu Qian, Ming Shi, Ming Yu, Meiru Hu, Qing Xia, Beifen Shen & Ning Guo

  2. National Center of Biomedical Analysis, Beijing, 100071, People’s Republic of China

    Zhiyi Zhang

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  1. Lu Qian
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  2. Zhiyi Zhang
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  3. Ming Shi
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  4. Ming Yu
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  5. Meiru Hu
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  6. Qing Xia
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  7. Beifen Shen
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  8. Ning Guo
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Correspondence to Ning Guo.

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Qian, L., Zhang, Z., Shi, M. et al. Expression and distribution of HSP27 in response to G418 in different human breast cancer cell lines. Histochem Cell Biol 126, 593–601 (2006). https://doi.org/10.1007/s00418-006-0195-0

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