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Assessment of cell cycle-associated antigen expression using multiparameter flow cytometry and antibody-acridine orange sequential staining.

A novel approach which enables direct assessment of the differential expression of cellular antigens in noncycling (G0) and cycling cell subpopulations is presented. The method involves flow cytometric analysis and sorting of cells stained by use of indirect immunofluorescence, followed by restaining using acid acridine orange, to relate the immunofluorescence of sorted lymphoid subpopulation(s) to cell proliferation status (i.e., G0 vs. G1 vs. S vs. G2 and M). In the present study, this technique successfully identifies the proliferation-associated modulation of a heterochromatin-associated antigen in pokeweed mitogen-stimulated human lymphoid cultures. The potential utility of this method for documenting early antigenic changes associated with the G0-G1 transition is discussed.