Figure 5. Effect of extracellular acidification on pH_i of rat aorta cross sections assessed using a confocal scanning laser microscope.

A) Fluorescence intensity for endothelial layer. B) Fluorescence intensity for muscular layer. C) Representative confocal photomicrograph of one aorta cross section. Aorta cross sections were loaded with SNARF-1 (10 µM) and analyzed by confocal microscopy. Aorta cross sections were stimulated at 3^rd and 9^th min with Hanks acidified solution pH 7.0 and 6.5, respectively. HCl was used to change the pH of Hanks solution; Hanks solution pH 7.4 served as control. Fluorescence intensity was measured before the stimulus (F) and at 6^th min after the stimulus for each pH_o value (F_pH). Results are reported as ΔF = F_pH – F. All values are means ± SEM (n = 7). One-way ANOVA, Bonferroni's post-test, * p<0.01 versus control.