three-day treatment of chromaffin cell cultures with compounds that increase levels of cyclic amp ( forskolin , cholera toxin , theophylline , dibutyryl- and 8-bromo cyclic amp ) increased total extractable tyrosine hydroxylase activity and gtp-cyclohydrolase , the rate-limiting enzyme in the biosynthesis of tetrahydrobiopterin .
C0001455
cyclic amp
C0000661
8-bromo cyclic amp