Abstract：
:The activity of short porcine galanin (Gal) analogues was tested in vitro using rat gastric fundus strips. The peptides contracted longitudinal smooth muscle in a concentration-dependent manner with the following order of potency: Gal(1-29) >[Cit(14)]Gal(1- 15) >[Asp(14)]Gal(1- 15) >[Dab(14)]Gal(1- 15) >[Nle(14)] Gal(1-15) >[Dpr(14)]Gal(1- 15) >[Arg(14)]Gal(1- 15) >[Orn(14)]Gal(1- 15) >Gal(1-15). Only in the case of two peptides, namely [Cit(14)]Gal(1-15) and [Dab(14)]Gal(1-15) did the values of Hill coefficients, estimated from the appropriate concentration-contraction curves, differ significantly from unity. Our results indicate that both N- and C-terminals of Gal molecule contribute towards the affinity and activity of Gal in rat gastric smooth muscle cell receptors, indicating that their integrity is essential for its full excitatory myogenic action. The substitution of histidine with citruline, aspartic acid, norleucine or diaminobutyric acid in position 14 of the amino acid chain led to a considerable increase in potency, suggesting that amino acids located at this position might play a crucial role where the strength of short analogues is concerned.
journal_name
Pharmacol Resjournal_title
Pharmacological researchauthors
Korolkiewicz RP,Konstański Z,Rekowski P,Ruczyński J,Szyk A,Dabkowski J,Ujda M,Korolkiewicz KZ,Petrusewicz Jdoi
10.1006/phrs.2001.0827keywords:
subject
Has Abstractpub_date
2001-07-01 00:00:00pages
47-51issue
1eissn
1043-6618issn
1096-1186pii
S1043-6618(01)90827-8journal_volume
44pub_type
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