Endogenous formation of morphine in human cells

Proceedings of the National Academy of Sciences of the United States of America
Chotima PoeaknapoMeinhart H Zenk

Abstract

Morphine is a plant (opium poppy)-derived alkaloid and one of the strongest known analgesic compounds. Studies from several laboratories have suggested that animal and human tissue or fluids contain trace amounts of morphine. Its origin in mammals has been believed to be of dietary origin. Here, we address the question of whether morphine is of endogenous origin or derived from exogenous sources. Benzylisoquinoline alkaloids present in human neuroblastoma cells (SH-SY5Y) and human pancreas carcinoma cells (DAN-G) were identified by GC/tandem MS (MS/MS) as norlaudanosoline (DAN-G), reticuline (DAN-G and SH-SY5Y), and morphine (10 nM, SH-SY5Y). The stereochemistry of reticuline was determined to be 1-(S). Growth of the SH-SY5Y cell line in the presence of (18)O(2) led to the [(18)O]-labeled morphine that had the molecular weight 4 mass units higher than if grown in (16)O(2), indicating the presence of two atoms of (18)O per molecule of morphine. Growth of DAN-G cells in an (18)O(2) atmosphere yielded norlaudanosoline and (S)-reticuline, both labeled at only two of the four oxygen atoms. This result clearly demonstrates that all three alkaloids are of biosynthetic origin and suggests that norlaudanosoline and (S)-reticuline are en...Continue Reading

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