Azapeptide Analogues of the Growth Hormone Releasing Peptide 6 as Cluster of Differentiation 36 Receptor Ligands with Reduced Affinity for the Growth Hormone Secretagogue Receptor 1a
摘要:
The synthetic hexapeptide growth hormone releasing peptide-6 (GHRP-6) exhibits dual affinity for the growth hormone secretagogue receptor la (GHS-R1a) and the cluster of differentiation 36 (CD36) receptor. Azapeptide GHRP-6 analogues have been synthesized, exhibiting micromolar affinity to the CD36 receptor with reduced affinity toward the GHS-R1a. A combinatorial split-and-mix approach furnished aza-GHRP-6 leads, which were further examined by alanine scanning. Incorporation of an aza-amino acid residue respectively at the D-Trp(2) Ala(3), or Trp(4) position gave aza-GHRP-6 analogues with reduced affinity toward the GHS-R1a by at least a factor of 100 and in certain cases retained affinity for the CD36 receptor. In the latter cases, the D-Trp2 residue proved important for CD36 receptor affinity; however, His' could be replaced by Ala' without considerable loss of binding. In a microvascular sprouting assay using a choroid explant, [azaTyr(4)]-GHRP-6 (15), [Ala(1), azaPhe(2)]-GHRP-6 (16), and [azaLeu(3), Ala(6)]-GHRP-6 (33) all exhibited antiangiogenic activity.
[EN] AZAPEPTIDES AS CD36 BINDING COMPOUNDS<br/>[FR] AZAPEPTIDES COMME COMPOSÉS SE LIANT AU CD36
申请人:UNIV MONTREAL
公开号:WO2008154738A1
公开(公告)日:2008-12-24
[EN] An azapeptide derivative of growth hormone releasing peptide (GHRP) of Formula I: A-(Xaa)a-N(RA)-N(RB)-C(O)-(Xaa')b-B which binds to CD 36. [FR] La présente invention concerne un dérivé azapeptide d'un peptide libérant une hormone de croissance (GHRP) de formule I : A-(Xaa)a-N(RA)-N(RB)-C(O)-(Xaa')b-B qui se lie au CD36.