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Journal Article
Research Support, Non-U.S. Gov't
Possible role of neuropeptide degrading enzymes on thyroliberin secretion in fetal hypothalamic cultures grown in serum free medium.
Neuropeptides 1986 Februrary
In the present work, we have looked for the presence of two tissular neuropeptide degrading activities, the pyroglutamate aminopeptidase (PAP) and the post-proline cleaving enzyme (PPCE), in dissociated brain cell cultures. These two activities are present in extracts of cells grown in serum-free medium and are detected at a very low level in incubation media. Depolarization of hypothalamic neurons by 60 mM K+ does not specifically increase the level of PAP and PPCE in the medium. We have also used an inhibitor of PPCE: Z-Gly-ProCHN2. This compound can be left in contact with living cells without any toxicity, and in certain conditions of incubation blocks totally and irreversibly both PAP and PPCE. This blockade results in increased levels of TRH, intracellular as well as released into the medium, spontaneously and upon K+ depolarization. These results evidence the role of degradation processes in the mechanisms regulating peptide turn-over.
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