Abstract:
:Pyroglutamyl diazomethyl ketone and N-benzyloxycarbonyl prolyl prolinal, specific inhibitors of pyroglutamyl peptidase I and prolyl endopeptidase respectively, were used to study the possible role of these enzymes in the regulation of thyrotropin releasing hormone turnover. In vitro thyrotropin releasing hormone release by male rat hypothalamic slices was studied. Combined in vitro treatment with 10(-5)M of both inhibitors totally inhibited both enzymatic activities. The treatment did not affect basal or 56 mM K+ induced thyrotropin releasing hormone release or thyrotropin releasing hormone levels in slices. Repeated combined intraperitoneal injections of the two inhibitors for up to 12 hours produced a 70%-95% reduction in mouse brain pyroglutamyl peptidase I specific activity and a 65%-85% reduction in prolyl endopeptidase specific activity. Thyrotropin releasing hormone levels were unaffected by this treatment in all regions tested. The data suggest that these two enzymes are not involved in the intra- or extracellular control of thyrotropin releasing hormone levels in brain or hypophysis.
journal_name
Neuropeptidesjournal_title
Neuropeptidesauthors
Charli JL,Mendez M,Joseph-Bravo P,Wilk Sdoi
10.1016/0143-4179(87)90010-2subject
Has Abstractpub_date
1987-05-01 00:00:00pages
373-8issue
4eissn
0143-4179issn
1532-2785pii
0143-4179(87)90010-2journal_volume
9pub_type
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