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Thus, the striking difference between rodent and porcine/bovine blood vessels is independent of the vascular bed and apparently due to a species difference in the molecular mechanism underlying vascular GTN bioactivation. http://www.selleckchem.com/products/fg-4592.html To shed light on this issue, we studied ALDH2 expression in these blood vessels by quantitative immunoblotting using human ALDH2 as a standard protein. As shown in Fig. 4A, homogenates of rat aorta contained 4.6?��?0.65?ng of ALDH2 per ��g of total protein. Expression of ALDH2 was much lower in porcine and bovine coronary arteries (0.04?��?0.02 and 0.51?��?0.08?ng/��g of total protein). A representative blot is shown in Fig. 4B. The subcellular distribution of ALDH2 is shown in Fig. 4C (summary data) and Fig. 4D (representative blot). Rat aorta contained 16.4?��?1.73 and 2.0?��?0.31?ng of ALDH2 per mg wet weight in cytosolic and mitochondrial fractions, respectively, confirming the predominant cytosolic localization of ALDH2 in rodent blood vessels observed previously [17]?and?[33]. Expression levels were considerably lower in the bovine vessels http://www.selleckchem.com/products/Etopophos.html (3.0?��?0.69 and 1.5?��?0.25?ng/mg in cytosolic and mitochondrial fractions, respectively). In porcine coronary arteries ALDH2 was hardly detectable ( https://en.wikipedia.org/wiki/PTPRJ shown in Fig. 4E, the highest expression levels were found in liver, containing about 150 (rat) and 40 (pig) ng/mg wet weight. Rat aorta expressed about 40?ng of ALDH2 per mg tissue, whereas expression levels were below 5?ng/mg in all porcine arteries studied (coronary, liver, renal, and splenic artery). The data on protein levels agreed well with ALDH2 mRNA expression (Fig. 5), which was hardly detectable in porcine coronary arteries (?0.01% of rat aorta) and about 18% of rat aortic levels in bovine coronary arteries. Expression levels of ALDH1A1 and ALDH3A1, respectively, were about 0.05 and 3% of the ALDH2 levels in rat aorta, and not or hardly detectable in porcine and bovine coronary arteries. The rates of GTN denitration were assayed as formation of 1,2-GDN and 1,3-GDN by blood vessel homogenates or subcellular fractions. For comparison and validation of the method, we studied GTN denitration by rat liver, aorta and heart in the absence and presence of chloral hydrate. As shown in Fig.