Synthesis and biological properties of new chimeric galanin analogue GAL(1-13)-[Ala10,11]ET-1(6-21)-NH2.
Several chimeric peptides consisting of the N-terminal fragment of galanin (GAL) and C-terminal fragments of other bioactive peptides (e.g. substance P, bradykinin, neuropeptide Y, mastoparan) have been synthesized and reported as high-affinity galanin receptor antagonists. Recently we have synthesized a new chimeric peptide, GAL(1-13)-[Ala(10,11)]ET-1(6-21)-NH(2), consisting of the N-terminal fragment of GAL and the C-terminal fragment of endothelin-1 (ET-1) analogue. This chimera was previously shown to be a moderate-affinity ligand to hypothalamic galanin receptors with a K(D) value of 205 nM. However, its biological action has been unknown so far. In our studies we characterized the biological properties of this new chimeric analogue, investigating its action on rat isolated gastric smooth muscles and influence on insulin secretion from rat isolated islets of Langerhans. Data acquired in the course of our studies suggest that analogue GAL(1-13)-[Ala(10,11)]ET-1(6-21)-NH(2) does not seem to be a potent galanin receptor antagonist in the gastrointestinal tract.
Faculty of Chemistry, University of Gdańsk, Sobieskiego 18, 80-952 Gdańsk, Poland. jarecki@chem.univ.gda.pl
J
J
Ruczyński
Z
Z
Konstański
M
M
Cybal
J
J
Petrusewicz
C
C
Wójcikowski
P
P
Rekowski
B
B
Kamińska
D000595:Amino Acid Sequence; D000818:Animals; D019004:Galanin / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology; D066298:In Vitro Techniques; D007328:Insulin / Q000378:metabolism; D000078790:Insulin Secretion; D008297:Male; D008969:Molecular Sequence Data; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects / Q000502:physiology; D051381:Rats; D017208:Rats, Wistar; D044088:Receptors, Galanin / Q000037:antagonists & inhibitors*; D011993:Recombinant Fusion Proteins / Q000138:chemical synthesis / Q000494:pharmacology*; D013270:Stomach / Q000187:drug effects / Q000502:physiology
D007328:Insulin; D044088:Receptors, Galanin; D011993:Recombinant Fusion Proteins; D019004:Galanin