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Further Studies at Neuropeptide S Position 5: Discovery of Novel Neuropeptide S Receptor Antagonists

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posted on 09.07.2009 by Remo Guerrini, Valeria Camarda, Claudio Trapella, Girolamo Caló, Anna Rizzi, Chiara Ruzza, Stella Fiorini, Erika Marzola, Rainer K. Reinscheid, Domenico Regoli, Severo Salvadori
Neuropeptide S (NPS) regulates various biological functions by activating the NPS receptor (NPSR). Previous studies demonstrated that the substitution of Gly5 with d-amino acids generates NPSR antagonists. Eleven [d-Xaa5]NPS derivatives were synthesized and pharmacologically tested measuring [Ca2+]i in HEK293mNPSR cells. The results confirmed that the [d-Xaa5] substitution promotes antagonist activity with potency inversely related to the side chain size and allowed identification of the novel potent NPSR peptide antagonist [tBu-d-Gly5]NPS.

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