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Abstract
Steady-state analyses of prodynorphin-derived opioid peptides were conducted on acid extracts of the brain of the frog, Xenopus laevis. Radioimmunoassays specific for dynorphin A(1–17), dynorphin A(1–8), α-neoendorphin and dynorphin B coupled with gel filtration chromatography and reverse phase high performance liquid chromatography were used. The major prodynorphin-related end-product detected was α-neoendorphin. Leu-enkephalin was also detected. Since the Xenopus proenkephalin precursor does not contain the Leu-enkephalin sequence, these data suggest that some of the prodynorphin-related end-products had been cleaved to yield Leu-enkephalin.
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