02216nab a2200313 i 4500 publ18367 20200309100827.0 200309s2020 hu o 0|| zxx d 2218-273X 10.3390/biom10020284 doi 31181191 mtmt SZTE Publicatio Repozitórium hun zxx Szűcs Edina Discovery of Kynurenines Containing Oligopeptides as Potent Opioid Receptor Agonists [elektronikus dokumentum] / Szűcs Edina 2020 Azonosító: 284-Terjedelem: 18 p BIOMOLECULES 10 No. 2 Kynurenine (kyn) and kynurenic acid (kyna) are well-defined metabolites of tryptophan catabolism collectively known as "kynurenines", which exert regulatory functions in host-microbiome signaling, immune cell response, and neuronal excitability. Kynurenine containing peptides endowed with opioid receptor activity have been isolated from natural organisms; thus, in this work, novel opioid peptide analogs incorporating L-kynurenine (L-kyn) and kynurenic acid (kyna) in place of native amino acids have been designed and synthesized with the aim to investigate the biological effect of these modifications. The kyna-containing peptide (KA1) binds selectively the m-opioid receptor with a Ki = 1.08 ± 0.26 (selectivity ratio m/d/k = 1:514:10000), while the L-kyn-containing peptide (K6) shows a mixed binding affinity for m, d, and k-opioid receptors, with efficacy and potency (Emax = 209.7 + 3.4%; LogEC50 = -5.984 + 0.054) higher than those of the reference compound DAMGO. This novel oligopeptide exhibits a strong antinociceptive effect after i.c.v. and s.c. administrations in in vivo tests, according to good stability in human plasma (t1/2 = 47 min). Stefanucci Azzurra aut Dimmito Marilisa Pia aut Zádor Ferenc aut Pieretti Stefano aut Zengin Gokhan aut Vécsei László aut Benyhe Sándor aut Nalli Marianna aut Mollica Adriano aut http://publicatio.bibl.u-szeged.hu/18367/1/SzucsE.-DiscoveryofKynurenines....pdf Dokumentum-elérés