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The Journal of Immunology, Vol 130, Issue 2 626-631, Copyright © 1983 by American Association of Immunologists

ARTICLES

Level of mIa expression on mitogen-stimulated murine B lymphocytes is dependent on position in cell cycle

JG Monroe and JC Cambier

Using correlated flow cytometric analysis of cell surface Ia antigen expression (immunofluorescence) and cell cycle phase (pulse-width of axial light extinction), we have quantitated changes in expression of mIa antigen on murine B cells during progression through cell cycle. Our results indicate that density of mIa expressed on mitogen- stimulated B cells increases fourfold to fivefold during the transition from G0 to G1. By early S phase, mIa density has decreased by fourfold to fivefold relative to peak expression. This decrease becomes more evident by late S, G2, and M phases, when an eightfold decrease in mIa antigen density is observed relative to peak levels. This decrease results in mIa antigen expression lower than that of resting, unstimulated B cells. Therefore, maximum mIa antigen expression occurs during G0 to G1 transition and in early G1, when a requirement for I region-restricted, antigen-driven T cell help for thymus-dependent, antigen-driven B cell activation has been demonstrated.


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