Can amphipathic helices influence the CNS antinociceptive activity of glycopeptides related to β-endorphin?

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 Chem

authors

Li Y,St Louis L,Knapp BI,Muthu D,Anglin B,Giuvelis D,Bidlack JM,Bilsky EJ,Polt R

doi

10.1021/jm400879w

subject

Has Abstract

pub_date

2014-03-27 00:00:00

pages

2237-46

issue

6

eissn

0022-2623

issn

1520-4804

journal_volume

57

pub_type

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