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- W1569391610 abstract "Abstract The levels of cyclic adenosine 3'5'-monophosphate (cAMP) in unstimulated (resting) peripheral blood thymus-derived lymphocytes (T cells) from normal old humans and young-adult Down's syndrome (DS) patients were markedly decreased when compared with those of young normal humans. By contrast, the cyclic guanosine 3'5'-monophosphate (cGMP) in resting T cells from normal old and young-adult DS patients were greatly increased. The cAMP/cGMP ratios for unstimulated T cells therefore declined in normal aged and DS subjects. The specific activity of adenylate cyclase (ATP pyrophosphate-lyase[cycling]E.C.4.6.1.1) was elevated in T cells from the aged and DS groups, whereas that of guanylate cyclase (GTP pyrophosphate-lyase[cycling]E.C.4.6.1.2) decreased with age and in DS. These results denote the existence of substantial age-related biochemical changes in peripheral T cells. An imbalance in resting cyclic nucleotide levels and their generating enzymes in T cells of normal aging and DS subjects might contribute to the immune dysfunction occurring both with aging and in DS." @default.
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- W1569391610 date "1980-10-01" @default.
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- W1569391610 title "Alterations in cyclic nucleotides and cyclase-specific activities in T lymphocytes of aging normal humans and patients with Down's syndrome." @default.
- W1569391610 doi "https://doi.org/10.4049/jimmunol.125.4.1665" @default.
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