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- W1986945736 abstract "Inhibition of luteinizing hormone (LH) exocytosis by guanosine 5'-[gamma-thio]triphosphate (GTP gamma S) in permeabilized pituitary cells has indicated the involvement of one or more GTP-binding proteins in the exocytotic mechanism distal to second messenger generation. We now report that two inhibitory sites of action of GTP gamma S can be distinguished by their dependence on GTP gamma S concentration and their sensitivity to pertussis toxin. Ca(2+)-stimulated exocytosis was half-maximally inhibited by 6.8 microM GTP gamma S, a six-fold higher concentration than that required for inhibition of exocytosis stimulated by phorbol ester plus cAMP. In addition, GTP gamma S inhibition of Ca(2+)-stimulated exocytosis was insensitive to pertussis toxin, in contrast to the inhibition of exocytosis stimulated by phorbol ester plus cAMP, which was abolished by pretreatment with pertussis toxin. These results indicate that at least two stimulus-specific GTP-binding proteins are involved in regulating LH exocytosis distal to second messenger generation." @default.
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- W1986945736 date "1992-07-01" @default.
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- W1986945736 title "Involvement of pertussis toxin-sensitive and -insensitive GTP-binding proteins in luteinizing hormone exocytosis distal to second messenger generation" @default.
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- W1986945736 doi "https://doi.org/10.1016/0898-6568(92)90032-4" @default.
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