Leu13-psi(CH2NH)Leu14]bombesin is a specific bombesin receptor antagonist in Swiss 3T3 cells |
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| Authors: | P J Woll D H Coy E Rozengurt |
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| Institution: | Growth Regulation Laboratory, Imperial Cancer Research Fund, London, U.K. |
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| Abstract: | The pseudopeptide Leu13-psi(CH2NH)Leu14]bombesin blocks bombesin-stimulated mitogenesis in Swiss 3T3 cells in a competitive and reversible manner, but not that of other mitogens. It inhibits the mobilization of intracellular Ca2+ and activation of protein kinase C by bombesin-like peptides. It acts at receptor level, as shown by inhibition of 125I]GRP binding and reduction in cross-linking of the Mr 75-85,000 receptor-associated protein. Thus Leu13-psi(CH2NH)Leu14]bombesin is a specific bombesin receptor antagonist in Swiss 3T3 cells which blocks long-term growth promoting effects of bombesin-like peptides. |
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