Asparagine synthetase is partially localized to the plasma membrane and upregulated by L-asparaginase in U937 cells.
- Author:
Yingyi, HE
;
Benshang, LI
;
Changying, LUO
;
Shuhong, SHEN
;
Jing, CHEN
;
Huiliang, XUE
;
Jingyan, TANG
;
Longjun, GU
- Publication Type:Journal Article
- From:
Journal of Huazhong University of Science and Technology (Medical Sciences)
2011;31(2):159-63
- CountryChina
- Language:English
-
Abstract:
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.
