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- W2147028982 abstract "The present study assesses the effects of the phosphodiesterase inhibitor IBMX on norepinephrine (NE)-induced constriction of small mesenteric arteries. Arteries (∼150 μm) were dissected from rats and mounted on a wire myograph for isometric force measurement. NE concentration effect curves were generated after exposure to 500 μM IBMX for 60 min. IBMX significantly reduced NE-induced tension development. Studies were also conducted following sarcoplasmic reticulum (SR) depletion (ryanodine, 10 μM) or L-type Ca 2+ channel blockade [(+)-BAY K 8644, 10 μM] in the presence and absence of IBMX. Both SR depletion and L-channel blockade reduced NE-induced tension generation, consistent with incomplete Ca 2+ mobilization. IBMX significantly attenuated NE responses in ryanodine and (+)-BAY K 8644-treated vessels. Finally, treatment of NE-stimulated vessels with IBMX (500 μM) caused a reduction in vascular tension that was greater than the concomitant reduction in cytosolic Ca 2+ concentration ([Ca 2+ ] i ), indicating that a portion of the IBMX-mediated relaxation is Ca 2+ -independent. These data suggest that IBMX attenuation of NE responsiveness not only involves a reduction in [Ca 2+ ] i but also a significant decrease in Ca 2+ sensitivity." @default.
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- W2147028982 date "1999-04-01" @default.
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- W2147028982 title "Effects of IBMX on norepinephrine-induced vasoconstriction in small mesenteric arteries" @default.
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- W2147028982 doi "https://doi.org/10.1152/ajpgi.1999.276.4.g909" @default.
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