Regulatory natural killer cells in murine liver and their immunosuppressive capacity
Article first published online: 14 MAY 2010
© 2010 John Wiley & Sons A/S
Volume 30, Issue 6, pages 906–912, July 2010
How to Cite
Yoshida, O., Akbar, S. M. F., Chen, S., Miyake, T., Abe, M., Murakami, H., Hiasa, Y. and Onji, M. (2010), Regulatory natural killer cells in murine liver and their immunosuppressive capacity. Liver International, 30: 906–912. doi: 10.1111/j.1478-3231.2010.02253.x
- Issue published online: 31 MAY 2010
- Article first published online: 14 MAY 2010
- Received 29 September 2009Accepted 28 March 2010
- hepatic NK cells;
- immune tolerance;
- liver immunity;
- regulatory NK cells
Background: Abundant amounts of natural killer (NK) cells are present in the liver, most of which are endowed with direct cytotoxic and inflammatory cytokine production capacities. However, the control of compromised immunity in the liver may be accomplished by a population of regulatory NK cells possessing suppressive or tolerogenic functions.
Aims: To identify and characterize regulatory NK cells in murine liver.
Methods: NK cells were isolated from the liver of C57BL/6 mice by magnetic-activated cells sorting (MACS). NK cells were stimulated with different agents and those cells that produced interleukin (IL)-10 were detected by flow cytometry and isolated by MACS. IL-10-producing NK cells were regarded as regulatory NK cells and the functional capacities of liver-derived regulatory NK cells were assessed in vitro.
Results: The frequencies of regulatory NK cells in the liver were 4.1 ± 0.3% of hepatic NK cells and 0.45 ± 0.02% of liver nonparenchymal cells. Regulatory NK cells produced abundant amounts of IL-10 in culture. These cells also suppressed the proliferative capacities of T cells and B cells in vitro. However, another population of NK cells that did not produce IL-10 (immunogenic NK cells) could not suppress lymphocyte proliferation.
Conclusions: The presence of regulatory NK cells in the liver and their immunosuppressive capacities endowed these cells with the critical function of maintaining homeostasis under normal conditions. Exaggerated or impaired functions of these cells may also contribute to different pathological processes.