Large, activated B cells are the primary B-cell target of 8-bromoguanosine and 8-mercaptoguanosine |
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Authors: | L S Wicker R C Boltz E A Nichols B J Miller N H Sigal L B Peterson |
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Institution: | 1. Department of Psychology, Second University of Naples, Italy;2. Laboratory of Immersive Virtual Reality, Second University of Naples, Italy;1. Indiana University-Purdue University Indianapolis, United States of America;2. Elon University, United States of America |
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Abstract: | Previous studies have documented the ability of 8-bromoguanosine (8-BrGuo) and 8-mercaptoguanosine (8-MGuo) to induce polyclonal proliferation and differentiation of B cells from a variety of mouse strains. In the present study, we have defined the cellular target of this mitogenic activity. Using B cells fractionated according to size, we have found that large B cells are responsive to 8-BrGuo- and 8-MGuo-induced proliferation and differentiation whereas small, resting B cells are relatively unresponsive to these compounds. Addition of splenic adherent cells to the small B-cell fraction partially restored the proliferative but not the differentiative responses to 8-BrGuo and 8-MGuo. Although small B cells alone did not proliferate or differentiate in response to 8-BrGuo and 8-MGuo, cell surface expression of Ia antigens increased following incubation with these compounds. Thus, the biological activity of 8-BrGuo and 8-MGuo appears to be dictated by the cell type upon which it is acting. Small B cells are activated as evidenced by increased levels of surface Ia whereas large B cells are not only activated but are also induced to proliferate and differentiate. |
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