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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The effect of streptozotocin diabetes on the vasoactive intestinal peptide receptor/effector system in membranes from rat ventral prostate.

All of the components of the neuropeptide vasoactive intestinal peptide (VIP) signal transduction system were underexpressed in rat prostatic membranes 6 weeks after streptozotocin-induced diabetes. Binding studies with [125I]VIP showed decreases of 86% and 62% in the binding capacity of the high and low affinity classes of VIP receptors in diabetes. Affinity labeling experiments indicated that the main form of VIP receptor was 51 kilodaltons in control rats and 45 kilodaltons in diabetic animals. The efficacy of VIP and forskolin in stimulation of adenylyl cyclase activity as well as the potentiating effect of GTP on VIP action were also reduced in diabetes, as was the expression of the alpha-subunit of the guanine nucleotide-binding regulatory proteins Gs and Gi (studied by ADP ribosylation with cholera and pertussis toxins). Gi function was lost in diabetes, as assessed with experiments on guanyl-5'-yl-imidodiphosphate potentiation of forskolin activity. These disturbances together with previous findings argue for VIP playing a role in the diabetic neuropathy of the genitourinary tract.[1]


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