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Asparagine synthetase is partially localized to the plasma membrane and upregulated by L-asparaginase in U937 cells

Summary

This study investigated the intracellular localization of asparagine synthetase (ASNS) in the relation with chemoresistance in leukemia. pIRES-GFP-ASNS-Flag/Neo expression vector was transiently tansfected into SK-N-MC cells and 297T cells respectively. Immunofluorescence and Western blot analysis were performed for cellular localization of ASNS respectively. U937 cells were treated with L-asparaginase for 48 h and examined for endogenous ASNS expression on plasma membrane by immunofluorescence staining. Immunofluorescence staining showed that the transiently expressed ASNS was partly localized on transfected-SK-N-MC cell surface. Moreover, Western blotting exhibited that ASNS expressed both in cytosol and on plasma membrane of transfected-293T cells. Immunofluorescence staining with anti-ASNS-specific monoclonal antibody revealed that endogenous ASNS was localized on the plasma membrane of U937 cells, except for its distribution in the cytosol. In addition, ASNS exhibited a higher expression on plasma membrane after treatment with L-asparaginase as compared with the untreated cells. It was concluded that the subcellular translocation of ASNS may play an important role in L-asparaginase resistance in leukemia cells.

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Correspondence to Longjun Gu.

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The two authors contributed equally to this work.

This project was supported by grants from the National Natural Science Foundation of China (Nos. 30672271 and 81000227).

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He, Y., Li, B., Luo, C. et al. Asparagine synthetase is partially localized to the plasma membrane and upregulated by L-asparaginase in U937 cells. J. Huazhong Univ. Sci. Technol. [Med. Sci.] 31, 159–163 (2011). https://doi.org/10.1007/s11596-011-0243-4

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  • DOI: https://doi.org/10.1007/s11596-011-0243-4

Key words

  • asparagine synthetase
  • L-asparaginase
  • acute myeloid leukemia
  • drug resistance
  • plasma membrane