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CA Gruetter, DY Gruetter, JE Lyon, PJ Kadowitz and LJ Ignarro
The purpose of the present study was to determine time course relationship between cyclic GMP accumulation and relaxation in bovine coronary artery and evaluate the effects of recently identified inhibitors, methylene blue and methemoglobin, on these relationships. Arterial strips were suspended in specially mounted tissue baths which permitted continuous recording of isometric tension until rapid freeze- clamping for subsequent determination of cyclic GMP levels by radioimmunoassay. Relaxation and cyclic GMP levels were measured in submaximally contracted strips at zero time (untreated) or 5-sec to 5- min intervals after exposure to 0.5 microliter of nitric oxide, 1 microM glyceryl trinitrate, 1 microM sodium nitroprusside of 1 mM sodium nitrite in the absence or presence of 10 mM methylene blue or 1 microM methemoglobin. Cyclic GMP accumulation preceded onset of relaxation elicited by nitric oxide and glyceryl trinitrate and temporally correlated with relaxation induced by sodium nitroprusside and sodium nitrite. Methylene blue simultaneously inhibited cyclic GMP accumulation and relaxation induced by all four relaxants. In contrast to methylene blue, methemoglobin abolished cyclic GMP accumulation and relaxation elicited by nitric oxide without altering responses to glyceryl trinitrate, sodium nitroprusside and sodium nitrite. These findings are consistent with and strongly support an involvement of cyclic GMP formation in vascular smooth muscle relaxation elicited by nitrogen oxide-containing vasodilators.
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