Abstract:
:Glycosylated β-endorphin analogues of various amphipathicity were studied in vitro and in vivo in mice. Opioid binding affinities of the O-linked glycopeptides (mono- or disaccharides) and unglycosylated peptide controls were measured in human receptors expressed in CHO cells. All were pan-agonists, binding to μ-, δ-, or κ-opioid receptors in the low nanomolar range (2.2-35 nM K(i)'s). The glycoside moiety was required for intravenous (i.v.) but not for intracerebroventricular (i.c.v.) activity. Circular dichroism and NMR indicated the degree of helicity in H2O, aqueous trifluoroethanol, or micelles. Glycosylation was essential for activity after i.v. administration. It was possible to manipulate the degree of helicity by the alteration of only two amino acid residues in the helical address region of the β-endorphin analogues without destroying μ-, δ-, or κ-agonism, but the antinociceptive activity after i.v. administration could not be directly correlated to the degree of helicity in micelles.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Li Y,St Louis L,Knapp BI,Muthu D,Anglin B,Giuvelis D,Bidlack JM,Bilsky EJ,Polt Rdoi
10.1021/jm400879wsubject
Has Abstractpub_date
2014-03-27 00:00:00pages
2237-46issue
6eissn
0022-2623issn
1520-4804journal_volume
57pub_type
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