Figure 5.

Modulation of NE secretion by other receptors. (A) Amperometric recordings in Ringer’s (Control), in Ringer’s with 1 μM PGE₂ (PGE₂), and in Ringer’s solution again (Wash out). The application of PGE₂ started 15 s before stimuli and continued during the recording. (B) Recordings as in A except that PGE₂ was replaced by 1 μM secretion. (C) Reduction of secretion by neuromodulators. NE secretion relative to controls was measured with 10 μM adenosine (59.6 ± 4.9%) (n = 5), 1 μM PGE₂ (57.7 ± 8.8%) (n = 3), 250 nM somatostatin (67.3 ± 5.5%) (n = 4), and 1 μM secretin (56.3 ± 6.4%) (n = 3).