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. 1981 Dec;78(12):7604–7608. doi: 10.1073/pnas.78.12.7604

Activation of lymphocytes by brominated nucleoside and cyclic nucleotide analogues: implications for the "second messenger" function of cyclic GMP.

M G Goodman, W O Weigle
PMCID: PMC349317  PMID: 6278483

Abstract

The purine nucleoside guanosine, when derivatized at the C-8 position to give 8-bromoguanosine (8-BrGuo), acquires the capacity to stimulate high-level lymphocyte proliferation in the presence or absence of serum. Direct comparisons were undertaken to determine whether this activity is exerted only by virtue of the structural resemblance of 8-BrGuo to 8-bromo cyclic GMP (8-BrcGMP) (a known intracellular lymphocyte mitogen). They showed that, of the brominated guanosine derivatives studied, 8-BrGuo is the primary activator because (i) it is a far more potent lymphocyte activator than 8-BrcGMP, the order of mitogenic potency being 8-BrGuo greater than 8-bromo GMP (8-BrGMP) greater than 8-BrcGMP; (ii) it acts much more rapidly than 8-BrcGMP; (iii) it is not metabolized to 8-BrcGMP or cGMP; and (iv) it does not elevate intracellular cGMP content. cGMP is not likely to be the second messenger serving to activate B cells because (i) it does not induce significant proliferation unless brominated at the C-8 position; (ii) the brominated form is much less efficient than 8-BrGuo or 8-BrGMP; (iii) 8-BrGuo and many other mitogens do not increase intracellular cGMP; (iv) many agents that increase cGMP fail to initiate lymphocyte activation; (v) certain agents that increase cGMP (i.e., 15-hydroperoxyarachidonic acid, azide) inhibit lymphocyte activation; and (vi) addition of unbrominated cGMP to cultures stimulated with 8-BrGuo actually diminished stimulation. These data (i) indicate that, by interaction with cellular components, 8-BrGuo triggers high level lymphocyte activation and (ii) cast significant doubt on the role of cGMP as an intracellular second messenger in lymphocyte proliferation.

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Selected References

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