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- W2411112834 abstract "Deoxyadenosine (dAdo) levels above 2 microM inhibit plasma cell (PC) differentiation by human blood lymphocytes in pokeweed mitogen (PWM) stimulated cultures containing deoxycoformycin (dCF), a potent inhibitor of adenosine deaminase (ADA). ADA inhibition by dCF alone did not suppress PC differentiation. Thymidine uptake by T cell blasts continuously cultured in conditioned medium was inhibited by dAdo and dCF; two of five EBV-infected B cell lines were also inhibited while three were resistant. Inhibition of PWM-induced PC differentiation of B cells by dCF and dAdo was reversed when conditioned medium (a source of T cell helper factors) was added to the cultures, and dAdo and dCF added to PWM-stimulated cultures 48 hr after their initiation did not inhibit PC differentiation, though thymidine uptake and the total number of cells recovered from the cultures were reduced. Removal of T cells after 48 hr of culture slightly reduced the numbers of PC in PWM-stimulated lymphocyte cultures but no further inhibition was obtained when dCF and dAdo were added to these T-depleted cultures, nor was their thymidine uptake further reduced. These results suggest that the in vitro suppression of B cell differentiation by dAdo in PWM-stimulated cultures is not due to direct toxicity of purine nucleosides to B cells but may be due to interference with T cell help. This is consistent with the view that a relative lack of helper activity by T cells contributes to the antibody deficiency of patients with ADA deficiency." @default.
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- W2411112834 date "1980-07-01" @default.
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- W2411112834 title "Resistance of pokeweed mitogen-stimulated B cells to inhibition by deoxyadenosine." @default.
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