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Granzyme B is recovered by natural killer cells via clathrin-dependent endocytosis

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Abstract

When they recognize a target cell, natural killer (NK) cells mount an attack to kill the target by exerting their cytotoxicity via the exocytosis of cytotoxic granules. Although the details of this process (which includes the movement of cytotoxic granules in the immune synapse and their fusion with the plasma membrane, releasing granzymes and perforin into the synaptic cleft) are relatively better understood, the post-exocytosis regulation of the process is still largely unknown. Here we show that a clathrin-dependent endocytosis stimulated by target cell occurs in NK92 cell line, which is closely correlated with granzyme B recovery. Inhibition of the endocytosis significantly attenuates the cytotoxicity of NK92 cells. The NK cell recovery of its released effector molecules, in turn, suggests that endocytosis may well play a key role in the post exocytosis regulation of immune cells.

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Acknowledgements

We thank D. Phil (Oxon) Foad Katirai for his professional English editing and thank Prof. Tao Xu, Ms. Jingze Lu, and Mr. Yinong Zhang for their help with the confocal work. We thank Dr. Zhigang Tian, Dr. Ming Zhu, and Dr. Shi Chen for their help in the work of cell cultures. This work was supported by grants from the National Natural Sciences Foundation of China (No. 30400390) and Major State Basic Research Development Program of China (973 Program) (No. 2007CB512402) and the Ministry of Science and Technology (No. 2009DFA31940).

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Correspondence to Fang Zheng or Feili Gong.

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Figure S1. CPZ concentration titration. a,b The effect of chlorpromazine (CPZ) on the vitality of NK92 cells. 1 × 106 NK92 cells were pretreated with different concentrations of CPZ for 30 min at 37°C, respectively. The cells were then washed twice and stained with 10 μg/ml propidium iodide (PI) for 30 min. The death rate of NK92 cells was immediately analyzed by flow cytometry. c,d Effect of CPZ on transferrin (Tfr) internalization. 1 × 106 NK92 cells were pretreated with different concentrations of CPZ for 30 min at 37°C, respectively, and then washed and incubated with Alexa488-transferrin (10 µg/ml) for 30 min on ice for binding, washed, and transferred to 37°C for 30 min for internalization. After that, cells were washed with acid buffer (50 mM glycine, 150 mM NaCl, pH 2.5) to remove uninternalized transferrin, followed by neutralization with RPMI (pH 10). The endocytosis of Alexa488-transferrin is calculated as the fold change in mean fluorescence intensities (MFI). MFI of bound Alexa488-transferrin on the cell surface on ice was named MFI(maximum). MFI of internalized Alexa488-transferrin was named MFI(experiment). The percentage internalization is calculated by the following formula: percentage internalization = MFI(experiment)/MFI(maximum) × 100. Error bar indicates SD. Data are representative of three independent experiments (18_2010_377_MOESM1_ESM.tiff 779 kb)

Figure S2. Internalization of FM1-43FX and transferrin assays. A Effect of CPZ treatment on uptake of FM1-43FX by NK cells with PEC stimulation. a NK92 cells that were labeled with 5 μg/ml FM1-43FX for 5 min and kept always at 4℃ for maximum fluorescence. b NK92 cells that internalized FM1-43FX after stimulation with PEC for 3 h and washed with PBS to remove surface FM1-43FX. c NK92 cells that were pretreated with 10 μg/ml CPZ for 30 min and internalized FM1-43FX after stimulation with PEC. d NK92 cells that were continuously treated with CPZ for 3 h and internalized FM1-43FX with PEC stimulation; e No treatment of NK92 cells were as a control. B: Effect of CPZ treatment on endocytosis of Alexa488-transferrin. a NK92 cells that were labeled with 10 μg/ml Alexa488-transferrin for 30 min and kept always on ice for maximum transferrin fluorescence. b NK92 cells that were labeled with Alexa488-transferrin then transferred to 37°C to allow internalization for 3 h, then washed with acid wash buffer to remove surface ligands. c NK92 cells that were pretreated with 10 ug/ml CPZ for 30 min, and internalized Alexa488-transferrin. d NK92 cells that were continuously treated with CPZ for 3 h and internalized Alexa488-transferrin; e: No treatment of NK92 cells were as a control. Data are representative of three independent experiments. (18_2010_377_MOESM2_ESM.tiff 467 kb)

Figure S3. Cytotoxicity of NK cells is attenuated by pretreatment with sucrose. a, b The cytotoxicity of NK92 cells against K562 cells. After incubation of 0.45 M sucrose pretreated or non-pretreated NK cells and CFSE pre-labeled K562 cells at indicated ratio in the graft for 3 h, all cells were stained with PI and analyzed by FCM. a: Upper right quadrant shows the K562 death rate. b The cytotoxicity was calculated with formula described in the Materials and methods section. c The cytotoxicity of NK92 cells to PEC. After NK cells with or without sucrose pretreatment and PEC cells were cocultured at indicated ratio in the graft for 3 h, NK cells were discarded and PEC survivals were stained with crystal violet. The absorbance value was measured to calculate the cytotoxicity. *: p < 0.05. Data are representative of three independent experiments. (18_2010_377_MOESM3_ESM.tiff 1173 kb)

Figure S4. Colocalization of CD63 and granzyme B. a NK cells with CPZ pretreatment (+CPZ) or non-treatment (−CPZ) were stimulated by PEC for 0 min or 60 min, then fixed, permeabilized, and non-specific binding sites blocked and incubated with anti-CD63 (1:200), anti-granzyme B (1:200) and FITC- or TRITC-conjugated secondary antibody (1:200), respectively. b After NK cells with CHC-specific RNAi pretreatment (CHC) or scrambled RNAi (scrambled) pretreatment were stimulated by PEC for 0 min or 60 min, colocalization of LAMP-1 and granzyme B was observed by immunostaining as described above. CD63 is shown in green. Granzyme B (GrmB) is shown in red. Nucleus is shown in blue. Scale bar is 10 μm. Data are representative of three independent experiments. (18_2010_377_MOESM4_ESM.tiff 721 kb)

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Li, P., Zheng, G., Yang, Y. et al. Granzyme B is recovered by natural killer cells via clathrin-dependent endocytosis. Cell. Mol. Life Sci. 67, 3197–3208 (2010). https://doi.org/10.1007/s00018-010-0377-8

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