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- W2181750305 abstract "Prior treatment with serotonin (10-8-10 -7 M for 6 min) attenuated responses of rabbit mesenteric arteries to norepinephrine (NE) by 18-62%, but was without effect on the responses of the rabbit aorta. K ÷ relaxation responses in the mesenteric arteries were enhanced by serotonin, but in the aortic strips no K ÷ relaxation occurred either before or after treatment with serotonin. Maximum relaxation to monensin was similar in the two tissues. Post-serotonin attenuation and K ÷ and monensin relaxation were blocked by ouabain, indicating that they depended on Na+/K + pump stimulation. IntraceUular Na ÷ contents (Nai) were determined in the vessels by the Li substitution method. Na i was greater, and was increased to a greater extent by serotonin and K+-free physiological salt solution in the mesenteric artery compared to the aorta, suggesting that the cell membrane of the mesenteric artery is leakier to Na + than is that of the aorta. We conclude that the absence of post-serotonin attenuation in the aorta results from the failure of serotonin to increase Na i and thereby to stimulate the Na+/K + pump in this tissue. This study demonstrates that important individualities in vascular smooth muscle reactivity even in the same animal may result from differences in membrane permeability to sodium." @default.
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- W2181750305 date "1989-01-01" @default.
- W2181750305 modified "2023-09-27" @default.
- W2181750305 title "Individualities in post-serotonin attenuation and Na +/K + in vascular smooth muscle pump activity" @default.
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