Preliminary report on 8-amino-9-(2-thienylmethyl)guanine (PD 119,229), a novel and potent purine nucleoside phosphorylase inhibitor

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Abstract
PD 119,229 [8-amino-9-(2-thienylmethyl)guanine] is a novel and potent inhibitor of human erythrocyte purine nucleoside phosphorylase (PNP) with a Ki of 0.067 μM. In a cell line assay using human MOLT-4 (T cell) and MGL-8 (B cell) lymphoblasts, PD 119,229 alone had no effect on the growth of either cell line at the highest concentration tested (100 μM). However, in the presence of a nontoxic concentration of 2′-deoxyguanosine (10 μM), the IC50 values of PD 119,229 for MOLT-4 and MGL-8 were 0.9 and >100 μM, respectively. The inhibition of growth of MOLT-4 was accompanied by a 40-fold increase in dGTP and a two-fold reduction in GTP, while no alteration in nucleotide prolife was noted in MGL-8. Both the inhibition of growth of MOLT-4 and the accumulation of dGTP were substantially prevented by coaddition of 2′-deoxycytidine.