title: Pharmacological effects of nematode FMRFamide-related peptides (FaRPs) on muscle contractility of the trematode, Fasciola hepatica.
abstract: The physiological effects of synthetic replicates of the nematode FaRPs, AF1 (KNEFIRFamide), AF2 (KHEYLRFamide), PF1 (SDPNFLRFamide), PF2 (SADPNFLRFamide), AF8/PF3 (KSAYMRFamide) and PF4 (KPNFIRFamide) were examined on muscle preparations of the liver fluke, Fasciola hepatica. Changes in contractility following the addition of the test compound were recorded using a photo-optic transducer system. Unlike the varied effects these peptides have on nematode somatic musculature, all were found to induce excitatory responses in the muscle activity of F. hepatica. While qualitative effects of the nematode peptides were similar in that they induced increases in both the amplitude and frequency of F. hepatica muscle contractions, they varied considerably in the potency of their excitatory effects. The threshold activity for each peptide was as follows: 10 microM, PF1 and PF2; 3 microM, AF1 and PF3; 1 microM, AF2; and 30 nM, PF4. The results demonstrate, for the first time, the cross-phyla activity of nematode neuropeptides on the neuromuscular activity of a trematode.
authors.affiliation: Pharmacia & Upjohn Co., Kalamazoo, Michigan 49001, USA.
authors.forename: N J
authors.initials: NJ
authors.lastname: Marks
authors.forename: A G
authors.initials: AG
authors.lastname: Maule
authors.forename: D W
authors.initials: DW
authors.lastname: Halton
authors.forename: T G
authors.initials: TG
authors.lastname: Geary
authors.forename: C
authors.initials: C
authors.lastname: Shaw
authors.forename: D P
authors.initials: DP
authors.lastname: Thompson
mesh_terms: D000818:Animals; D004594:Electrophysiology; D019835:FMRFamide; D005210:Fasciola hepatica / Q000187:drug effects* / Q000502:physiology; D009119:Muscle Contraction / Q000187:drug effects; D009348:Nematoda / Q000737:chemistry; D009479:Neuropeptides / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D009842:Oligopeptides / Q000494:pharmacology
chemical_list: C093065:KPNFIRFamide; C087068:KSAYMRFamide; D009479:Neuropeptides; D009842:Oligopeptides; C098396:SADPNFLRFamide; C086748:SDPNFLRFamide; C063461:AF1 neuropeptide; C073964:AF2 neuropeptide; D019835:FMRFamide