Phosphorylation of deoxyguanosine by B and T lymphocytes: evidence against selective trapping of deoxyguanosine by T lymphocytes in purine nucleoside phosphorylase deficiency.

T and B lymphocytes from blood and tonsils, as well as T and B lymphoid cell lines, phosphorylate deoxyguanosine which is probably the major toxic metabolite in purine nucleoside phosphorylase (PNP) deficiency. T and B cells also have similar activities of purine nucleoside phosphorylase. These findings indicate that the selective T cell defect in patients with PNP deficiency is unlikely to be due to a selective 'trapping' of deoxyguanosine by T lymphocytes.