MicroRNA-150 regulates the cytotoxicity of natural killers by targeting perforin-1

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MicroRNA-150 regulates the cytotoxicity of natural killers by targeting perforin-1
Nayoung Kim; M Kim; Sohyun Yun; J Doh; P D Greenberg; Tae-Don Kim; In Pyo Choi
Bibliographic Citation
Journal of Allergy and Clinical Immunology, vol. 134, no. 1, pp. 195-203
Publication Year
Background Perforin-1 (Prf1) is the predominant cytolytic protein secreted by natural killer (NK) cells. For a rapid immune response, resting NK cells contain high Prf1 mRNA concentrations while exhibiting minimal cytotoxicity caused by a blockage of Prf1 protein synthesis, implying that an unknown posttranscriptional regulatory mechanism exists. Objective We sought to determine whether microRNA-150 (miR-150) posttranscriptionally regulates Prf1 translation in both mouse and human NK cells at rest and at various time points after activation. Methods Mouse NK cells with a targeted deletion of miR-150 (miR-150-/- NK cells), primary human NK cells, and NK92 MI cells were used to investigate the role of miR-150 in NK cells. NK cell cytotoxicity assays and Western blotting proved that activated miR-150-/- NK cells expressed upregulated Prf1, augmenting NK cell cytotoxicity. When immunodeficient mice were injected with miR-150-/- NK cells, there was a significant reduction in tumor growth and metastasis of B16F10 melanoma. Results We report that miR-150 binds to 3′ untranslated regions of mouse and human Prf1, posttranscriptionally downregulating its expression. Mouse wild-type NK cells displayed downregulated miR-150 expression in response to IL-15, which led to corresponding repression and induction of Prf1 during rest and after IL-15 activation, respectively. Conclusion Our results indicate that miR-150 is a common posttranscriptional regulator for Prf1 in mouse and human NK cells that represses NK cell lytic activity. Thus the therapeutic control of miR-150 in NK cells could enhance NK cell-based immunotherapy against cancer, providing a better clinical outcome.
immunotherapymiR-150NK cell cytotoxicityNK cellsperforin-1post-transcriptional regulationtumor growth and metastasis
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Division of Biomedical Research > Immunotherapy Research Center > 1. Journal Articles
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