Assessment of NK cells response to hepatocyte derived chemotactic agents.

This project was aimed to examine the NK92 cells response as the CXC chemokine responder cells in rat model of liver disorder and injuries. Hepatocytes were isolated from Sprague-dawly rats and cultured on collagen type 1. Migration of NK92 cells was assessed using a 48 well micro-chemotaxis technique. Transwell chambers were positioned faced up, blocked Medium supernatant (500 microL) obtained from hepatocytes cultures were placed into the lower compartment of each Transwell. The upper compartment was filled with either 500 microL of NK92 cells. After washing, Membrane-attached cells were fixed; stained and Membrane-attached cells were counted by light microscopy and/or by size gating (9-14 microm) with an automated counter system. Human NK92 cells were attracted to recombinant human IP-10 in a concentration and time-dependent manner. NK92 cells also exhibited a chemotactic response to medium harvested from primary hepatocyte cultures. Isolated and cultured hepatocytes express several different chemokines. Although we identified that medium from hepatocyte cultures contains specific chemokines by immunoblotting, there is potential that migration assays detected yet other chemokines and other factors such as complement components. In this report, we demonstrated that hepatocytes expressed factors that were chemoattractive for human NK92 cells and that the factors must interact with the repertoire of receptors responsible for recruitment of these cells.