Proteolytic degradation of gonadotropin-releasing hormone (GnRH) by rat ovarian fractions in vitro

GnRH in physiological concentrations is highly degradable by both soluble and particulate fractions of rat ovarian homogenate in vitro. The two proteolytic enzyme activities differ strongly by the soluble activity showing a dithiothreitol optimum, high inhibition by diisopropyl fluorophospate ( k i...

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Veröffentlicht in:Peptides (New York, N.Y. : 1980) N.Y. : 1980), 1983-11, Vol.4 (6), p.821-825
Hauptverfasser: Berger, Hartmut, Nikolics, Károly, Szöke, Balázs, Mehlis, Burkhard
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Sprache:eng
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Zusammenfassung:GnRH in physiological concentrations is highly degradable by both soluble and particulate fractions of rat ovarian homogenate in vitro. The two proteolytic enzyme activities differ strongly by the soluble activity showing a dithiothreitol optimum, high inhibition by diisopropyl fluorophospate ( k i =0.7 μ M ), and a relatively high affinity ( K m =1.1 μ M ) as opposed to the particulate fraction ( K i =3.5 mM and K m =150 μ M , respectively). The results of this study show that the rat ovary is differently endowed with GnRH-degrading activity at different sites. The involvement of these in terminating the biological activity of the hormone on the ovary may possibly depend on its exact pathway in this GnRH-target organ.
ISSN:0196-9781
1873-5169
DOI:10.1016/0196-9781(83)90074-8