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2015 ; 17
(ä): 12
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A High-Throughput Assay for Screening of Natural Products that Enhanced
Tumoricidal Activity of NK Cells
#MMPMID26516316
Gong C
; Ni Z
; Yao C
; Zhu X
; Ni L
; Wang L
; Zhu S
Biol Proced Online
2015[]; 17
(ä): 12
PMID26516316
show ga
BACKGROUND: Recently, immunotherapy has shown a lot of promise in cancer
treatment and different immune cell types are involved in this endeavor. Among
different immune cell populations, NK cells are also an important component in
unleashing the therapeutic activity of immune cells. Therefore, in order to
enhance the tumoricidal activity of NK cells, identification of new
small-molecule natural products is important. Despite the availability of
different screening methods for identification of natural products, a simple,
economic and high-throughput method is lacking. Hence, in this study, we have
developed a high-throughput assay for screening and indentifying natural products
that can enhance NK cell-mediated killing of cancer cells. RESULTS: We expanded
human NK cell population from human peripheral blood mononuclear cells (PBMCs) by
culturing these PBMCs with membrane-bound IL-21 and CD137L engineered K562 cells.
Next, expanded NK cells were co-cultured with non-small cell lung cancer (NSCLC)
cells with or without natural products and after 24 h of co-culturing, harvested
supernatants were analyzed for IFN-? secretions by ELISA method. We screened 502
natural products and identified that 28 candidates has the potential to induce
IFN-? secretion by NK cells to varying degrees. Among the 28 natural product
candidates, we further confirmed and analyzed the potential of one molecule,
andrographolide. It actually increased IFN-? secretion by NK cells and enhanced
NK cell-mediated killing of NSCLC cells. CONCLUSIONS: Our results demonstrated
that this IFN-? based high-throughput assay for screening of natural products for
NK cell tumoricidal activity is a simple, economic and reliable method.