Preparation of monoclonal antibody to hepatocellular membranes and its application to induction of liver cell membrane damage.

Monoclonal antibody (MoAb) to rat liver plasma membranes was prepared by hybridization of mouse immune lymphocytes with mouse myeloma cells, and was identified by the immunodiffusion method in a fraction of IgM secreted from the hybridoma thus obtained. In indirect immunofluorescence tests, specific fluorescence was detected only on the surface of rat hepatocytes, but neither on the cells from other organs of the rat nor on the hepatocytes of other species of animals, suggesting that the antibody may be organ- and species-specific. When the primary culture rat hepatocytes, labelled with isotopic chromium (51Cr), were treated with the MoAb together with complement, a specific release of 51Cr from the cells was found shortly after treatment, accompanied with bubbling of the cell membranes, and a significant release of 51Cr was observed at an MoAb concentration of 15 micrograms/ml or more. Without complement, or with inactivated complement, these reactions were not observed. These facts suggest strongly that the cell surface of the hepatocytes was damaged by the MoAb in the presence of complement.