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- W329583670 abstract "Patients deficient in purine nucleoside phosphorylase (PNP) generally have a pronounced deficiency in T cell function with no deleterious effect on B cell function. It has been demonstrated that high concentrations of 8-amino-guanosine (8-AG), an inhibitor of PNP, in combination with the PNP substrate 2'-deoxyguanosine (dGuo) can inhibit mitogen and antigen responsiveness of human lymphocytes in culture. The studies described here evaluated the effects of 8-AG and dGuo on the human MLR. Normal human lymphocytes were isolated from venous blood using Ficoll-Hypaque gradients. Stimulator cells, pretreated with mitomycin C (50 ..mu..g/ml), were added with an equal number of responder cells (2 x 10/sup 5/) to the wells of flat-bottomed microtiter plates. Cell proliferation was quantitated by the uptake of /sup 3/H-thymidine (TdR) during the final 4 hrs of six-day cultures. dGuo at 10-50 ..mu..M had no effect or stimulated proliferation, while dGuo at > 75 ..mu..M was markedly inhibitory. 8-AG alone at 100 ..mu..M had essentially no effect on TdR uptake. 8-AG (10-100 ..mu..M) plus dGuo (50 ..mu..M) produced a concentration-dependent inhibition of the MLR resulting in 8-AG IC/sub 50/s generally < 60 ..mu..M. Coaddition of 50 ..mu..M 2'-deoxycytidine, hypoxanthine or adenine partially prevented inhibition of the MLR." @default.
- W329583670 created "2016-06-24" @default.
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- W329583670 date "1986-03-05" @default.
- W329583670 modified "2023-09-25" @default.
- W329583670 title "Effects of 8-aminoguanosine and 2'-deoxyguanosine on the human mixed lymphocyte reaction (MLR). I. Description of the inhibition" @default.
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