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Monroe, J G; Cambier, J C
The Journal of immunology (1950) 131, Številka: 6Journal Article
We report the specific induction of B cell plasma membrane depolarization with the use of thymus-dependent and -independent antigens. We have utilized various trinitrophenol-carrier conjugates for the stimulation of isolated trinitrophenol-binding mouse B cells. Membrane depolarization was assessed by flow cytometric analysis of 3-3'-pentyloxacarbocyanine iodide (DiOC53)-stained cells. Entry into the cell cycle was determined by flow cytometric analysis of acridine orange-stained cells. The results indicate that polyvalent antigens, but not free hapten, induce B cell membrane depolarization by a large proportion of antigen-binding cells within 2 hr of stimulation. Although all polyvalent antigens induce membrane depolarization, only thymus-independent antigens induce the subsequent G0 to G1 transition, suggesting that the membrane Ig cross-linking signal alone, although sufficient to induce membrane depolarization and subsequent increased IA expression, is insufficient to drive the entry of B cells into the cell cycle. The G0 to G1 transition appears to be dependent on a second signal, perhaps mediated by the thymus-independent carrier or antigen-specific, Ia-restricted T cell helper.
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