Fig. 7.
Effect of ATP and adenosine on [Ca2+]i. HUVECs were grown on gelatin-coated glass coverslips, loaded with fura-2, and immersed in a quartz cuvette for radiometric fluorescent emission measurements. Each tracing shown is representative of at least 3 similar experiments. (A) Stimulation with 100 μmol/L ATP was followed by 0.5 U/mL thrombin (Thr). The [Ca2+]i response to thrombin looks virtually identical when tested alone, and is not modified by prior stimulation with ATP (not shown). (B and C) The response to 2-MeS-ATP was similar to the ATP response (B), and was not modified by preincubation with IBMX and adenosine (Ado), both tested at 100 μmol/L (C).