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- W2166108335 abstract "Isolated uterine vascular beds from virgin and pregnant rats were used to assess vascular reactivity and the ability of nitric oxide (NO), prostanoids and endothelium-derived hyperpolarizing factor (EDHF) to modulate these responses. One uterine horn from female rats in each oestrous cycle day and gestation day 17 was removed and perfused with physiological saline solution. Tone was induced with cirazoline (1 micromol/l), and concentration-response curves to acetylcholine (ACh) generated. Responsiveness to ACh was tested in the presence of N-nitro-L-arginine (L-NA), ibuprofen (IBU) and tetrabutylammonium (TBA), to inhibit NO synthase, cyclo-oxygenase and K+ channels respectively. Cirazoline-induced tone was smaller in the pregnant compared with the proestrous group. Sensitivity to ACh was cycle day and pregnancy dependent with pregnant > dioestrous day-1 > dioestrous day-2 > proestrous and oestrous. L-NA shifted the curve to the right in all groups except dioestrous day-1. IBU inhibited the ACh response in the pregnant group only. TBA virtually abolished the response in all groups. These results suggest that in the uterine vascular bed from pregnant rats, EDHF, along with NO and a dilator prostanoid mediate ACh-induced dilatation. In contrast, in the dioestrous day-1 group, only EDHF seems to be released by ACh in this vascular bed. In the oestrous, dioestrous day-2 and proestrous groups, ACh releases both EDHF and NO." @default.
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- W2166108335 date "2000-12-01" @default.
- W2166108335 modified "2023-09-25" @default.
- W2166108335 title "Oestrous cycle and pregnancy alter the reactivity of the rat uterine vasculature" @default.
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- W2166108335 doi "https://doi.org/10.1093/humrep/15.12.2496" @default.
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