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Monroe, J G; Cambier, J C
The Journal of immunology (1950) 130, Številka: 2Journal Article
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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