Single lymphocyte analysis with a microwell array chip.

Following genomics and proteomics, cytomics, a novel method of looking at life, has emerged for analyzing large populations of cells on a single-cell basis with multiple parameters in a quantitative manner. We have developed a highly integrated live-cell microarray system for analyzing the cellular responses of individual cells using a microwell array chip that has 234,000 microwells each of which is just large enough to fit a single cell. Compared with flow cytometry and microscope-based methods, our system can analyze the history of the cellular responses of a large number of cells. We have successfully applied the system to analyze human antigen-specific B-cells and produced human monoclonal antibodies (MoAb) against hepatitis B virus surface antigen. We have also constructed a mouse system to assess hepatitis B virus-neutralization activity and have demonstrated the neutralization activity of our antibodies. Our technology should expand the horizons of cell analysis as well as enable generation of human MoAb for antibody-based therapeutics and diagnosis for infectious diseases such as hepatitis viruses. (c) 2007 International Society for Analytical Cytology