ISSN:
1432-136X
Keywords:
Neurohormone D
;
Heart-accelerating activity
;
AKH/RPCH-family of peptides
;
Structure-function relationship
;
Periplaneta americana
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary The relative potencies of 11 naturally-occurring peptides of the adipokinetic hormone/red pigmentconcentrating hormone family (AKH/RPCH-family) have been assessed with respect to increase in heart rate in adult, female American cockroaches,Periplaneta americana, in in vitro and in vivo bioassays. In addition, analogues that lacked the N-terminal pyroglutamate residue or had a free threonine acid at the C-terminus were also investigated. In both bioassays the N- or C-terminal-modified analogues give no or little response suggesting that blocked termini are essential for receptor-binding. In both bioassays the naturally-occurring peptide from the cockroach corpus cardiacum Pea-CAH-I (neurohormone D) is more potent than the second endogenous peptide, Pea-CAH-II. On the basis of this result and previous data it is proposed that neurohormone D is the only physiologically important “true” cardioactive peptide. The dose-response curves of the other peptides indicate that in octapeptides, amino acid residues at positions 2, 6, and 7 are important for receptor-recognition, and that decapeptides are not as effective as octapeptides (exception: the peptide Rom-CC-I isolated from the grasshopperRomalea microptera).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01075674
Permalink
