title: Endothelial nitric oxide synthase expression in systemic and pulmonary circulation of streptozotocin induced diabetic rats: comparison using image analysis.
abstract: To compare the level of endothelial nitric oxide synthase (eNOS) expression produced in heart and lung vascular tissue, the protein content was determined using Western blot analysis with the enhancement of image processing. Heart and lung extracts from 12 and 24 weeks from control (CON) and streptozotocin-induced diabetic (DM) rats were collected for Western blot analysis. Using monoclonal antibody against rat eNOS protein (140 kDa), the eNOS-protein bands were detected with enhanced chemiluminescence (ECL; Amersham) and exposured to film (Hyperfilm-ECL; Amersham). Images of eNOS bands on each film were then scanned and saved to digital files. Using Global Lab Image software, the number of pixels in each digital file was counted and calibrated for eNOS-protein content. For the CON and DM groups, the mean values of eNOS-protein contents were calculated and expressed as a percentage of total protein content, 5 micrograms. It was found that the eNOS level in DM hearts was significantly decreased, as compared to age-matched CON hearts. On the other hand, eNOS levels in DM lungs was increased, compared to CON lungs. Therefore, it may be concluded that high, not low, flow-mediated eNOS expression is a good measure of hyperglycemic-induced endothelial dysfunction.
authors.affiliation: Field of Medical Science, Graduate School, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand.
authors.forename: P
authors.initials: P
authors.lastname: Sridulyakul
authors.forename: D
authors.initials: D
authors.lastname: Chakraphan
authors.forename: P
authors.initials: P
authors.lastname: Bhattarakosol
authors.forename: S
authors.initials: S
authors.lastname: Patumraj
mesh_terms: D000818:Animals; D001011:Aorta / Q000201:enzymology; D003331:Coronary Vessels / Q000201:enzymology*; D003921:Diabetes Mellitus, Experimental / Q000097:blood / Q000201:enzymology* / Q000235:genetics / Q000473:pathology; D004730:Endothelium, Vascular / Q000201:enzymology*; D004790:Enzyme Induction; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008163:Luminescent Measurements; D008168:Lung / Q000098:blood supply / Q000201:enzymology*; D008297:Male; D019001:Nitric Oxide Synthase / Q000096:biosynthesis* / Q000235:genetics; D052250:Nitric Oxide Synthase Type III; D009928:Organ Specificity; D018384:Oxidative Stress; D011652:Pulmonary Circulation; D051381:Rats; D017207:Rats, Sprague-Dawley; D013311:Streptozocin
chemical_list: D013311:Streptozocin; C496314:NOS3 protein, human; D019001:Nitric Oxide Synthase; D052250:Nitric Oxide Synthase Type III; C496316:Nos3 protein, rat