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Electrophoresis was performed in a cold room (4��C). eNOS dimer and monomer were detected http://www.selleckchem.com/products/pifithrin-alpha.html with anti-eNOS antibody (1:2000, BD Biosciences, Lexington, KY, USA). The immunoreactivity was detected by enhanced chemiluminescence method (ECL; GE Healthcare Bioscience, Piscataway, NJ, USA) and quantified using a luminescence image analyser LAS-4000mini and image analysis software Multi Gauge Ver.3.11 (Fuji Film, Tokyo, Japan). In situ superoxide production was determined in vessel cryosections with the oxidative fluorescent dye DHE, as previously described (Yamamoto et?al., 2007b; Nakamura et?al., 2009). Cryosections (8??m in thickness; Leica, Weltzar, Germany) from the aortas treated with 8-nitro-cGMP or 8-bromo-cGMP were incubated with DHE (5??M) at 37��C for 30?min and then viewed by fluorescent microscopy (Nikon, Eclips, Tokyo, Japan). For each slide, at least five images from different sections of the slide were captured, and average staining intensity was calculated http://en.wikipedia.org/wiki/Temsirolimus using image analysis software (Lumina Vision version 2.2, Mitani-Corp., Fukui, Japan). Relaxation responses are expressed as a percentage reversal of the Phe-induced contraction. Responses are plotted graphically as means from at least four separate experiments with vertical bars representing SEM. Curves were fitted to all the data by non-linear regression using Prism (GraphPad Software, San Diego, CA, USA) to calculate Emax and EC50 values. EC50 values were used to compare the relaxant effects of the cGMP analogues. A t-test was used to assess the significance of differences between EC50 values. A P-value http://www.selleckchem.com/screening/pfizer-licensed-library.html Japan). Preparations of all stock solutions and their subsequent dilution were made using distilled water. Exceptions to this were zaprinast and DHE, which were dissolved in DMSO (0.1% final concentration). As a control, some aortas were treated with DMSO (0.1%) alone and no changes were observed. 8-Nitro-cGMP by itself did not induce any significant change in basal tone of thoracic aortic rings from wild-type C57BL/6 mice (not shown). However, in the aortas contracted with the ��-adrenoceptor agonist Phe (0.1??M), 8-nitro-cGMP induced dose-dependent changes in isometric tension. As shown in Figure?1A, the cumulative addition of 0.