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Open AccessArticle

A Developed NK-92MI Cell Line with Siglec-7neg Phenotype Exhibits High and Sustainable Cytotoxicity against Leukemia Cells

Department of Biotechnology and Laboratory Science in Medicine, School of Biomedical Science and Engineering, National Yang-Ming University, Taipei 112, Taiwan
Department of Laboratory Medicine, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, New Taipei City 231, Taiwan
School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei 112, Taiwan
Division of Transfusion Medicine, Department of Medicine, Taipei Veterans General Hospital, Taipei 112, Taiwan
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2018, 19(4), 1073;
Received: 12 January 2018 / Revised: 29 March 2018 / Accepted: 3 April 2018 / Published: 4 April 2018
(This article belongs to the Section Molecular Toxicology)
Altered sialic acid processing that leads to upregulation of cell surface sialylation is recognized as a key change in malignant tissue glycosylation. This cancer-associated hypersialylation directly impacts the signaling interactions between tumor cells and their surrounding microenvironment, especially the interactions mediated by immune cell surface sialic acid-binding immunoglobulin-like lectins (Siglecs) to relay inhibitory signals for cytotoxicity. First, we obtained a Siglec-7neg NK-92MI cell line, NK-92MI-S7N, by separating a group of Siglec-7neg cell population from an eight-month-long-term NK-92MI in vitro culture by fluorescence-activated cell sorting (FACS). The effect of Siglec-7 loss on NK-92MI-S7N cells was characterized by the cell morphology, proliferation, and cytotoxic activity via FACS, MTS assay, cytotoxic assay, and natural killer (NK) degranulation assay. We found the expression levels of Siglec-7 in NK-92MI were negatively correlated with NK cytotoxicity against leukemia cells. This NK-92MI-S7N cell not only shared very similar phenotypes with its parental cells but also possessed a high and sustainable killing activity. Furthermore, this Siglec-7neg NK line was unexpectedly capable of eliminating a NK-92MI-resistant leukemia cell, THP-1, through enhancing the effector-target interaction. In this study, a NK cell line with high and sustainable cytotoxicity was established and this cell may provide a potential application in NK-based treatment for leukemia patients. View Full-Text
Keywords: glycosylation; hypersialylation; immuno-surveillance; natural killer cell; Siglec-7 glycosylation; hypersialylation; immuno-surveillance; natural killer cell; Siglec-7
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Huang, C.-H.; Liao, Y.-J.; Fan, T.-H.; Chiou, T.-J.; Lin, Y.-H.; Twu, Y.-C. A Developed NK-92MI Cell Line with Siglec-7neg Phenotype Exhibits High and Sustainable Cytotoxicity against Leukemia Cells. Int. J. Mol. Sci. 2018, 19, 1073.

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