Studies on the cellular uptake of substance P and lysine-rich, KLA-derived model peptides

Journal of Molecular Recognition : JMR
Johannes OehlkeMichael Bienert

Abstract

In the last decade many peptides have been shown to be internalized into various cell types by different, poorly characterized mechanisms. This review focuses on uptake studies with substance P (SP) aimed at unravelling the mechanism of peptide-induced mast cell degranulation, and on the characterization of the cellular uptake of designed KLA-derived model peptides. Studies on structure-activity relationships and receptor autoradiography failed to detect specific peptide receptors for the undecapeptide SP on mast cells. In view of these findings, a direct interaction of cationic peptides with heterotrimeric G proteins without the participation of a receptor has been proposed. Such a process would require insertion into and translocation of peptides across the plasma membrane. In order to clarify whether a transport of cationic peptides into rat peritoneal mast cells is possible, transport studies were performed by confocal laser scanning microscopy (CLSM) using fluorescence-labeled Arg(3),Orn(7)-SP and its D-amino acid analog, all-D-Arg(3),Orn(7)-SP, as well as by electron microscopic autoradiography using (3)H-labelled SP and (125)I-labelled all-D-SP. The results obtained by CLSM directly showed translocation of SP peptides in...Continue Reading

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