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- W2072296905 abstract "The present report describes the status of the vasoactive intestinal peptide (VIP) receptor/effector system of signal transduction in seminal vesicle from streptozotocin (STZ)-treated rats. STZ-treatment modified the binding parameters of the high-affinity sites for VIP in seminal vesicle: 0.78 +/- 0.10 and 2.54 +/- 0.30 nM for the dissociation constant (Kd) in control and diabetic rats, respectively; 0.07 +/- 0.01 and 0.15 +/- 0.03 pmol VIP/mg protein for the maximum binding capacity (Bmax) in control and diabetic rats, respectively. It was associated with a reduced potency of VIP on the stimulation of adenylyl cyclase activity in the diabetic state (ED50 = 64.0 +/- 20.0 nM) as compared to control (ED50 = 9.5 +/- 4.3 nM). In contrast, the stimulatory effects of GTP, Gpp[NH]p and forskolin on the enzyme activity were not modified in diabetic rats. The levels of G-protein subunits in rat seminal vesicle were studied by immunoblot of alpha s and alpha i subunits: whereas alpha i-subunit levels did not vary, those corresponding to alpha s subunit decreased after STZ treatment. In diabetic rats, low concentrations of Gpp[NH]p failed to inhibit forskolin-stimulated adenylyl cyclase activity, suggesting the absence of functional Gi in this condition. In conclusion, present results show a decrease in the sensitivity of the VIP receptor/effector system in seminal vesicle membranes from STZ-treated rats suggesting a physiopathological role for VIP in the seminal neuropathy observed in diabetes." @default.
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- W2072296905 date "1994-02-01" @default.
- W2072296905 modified "2023-09-27" @default.
- W2072296905 title "Analysis of vasoactive intestinal peptide receptors and the G protein regulation of adenylyl cyclase in seminal vesicle membranes from streptozotocin-diabetic rats" @default.
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- W2072296905 doi "https://doi.org/10.1016/0898-6568(94)90071-x" @default.
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