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Platyhelminth FMRFamide-related peptides
C Shaw1, A G Maule, D W Halton
1Comparative Neuroendocrinology Research Group, Queen's University of Belfast, U.K.
International Journal for Parasitology
|April 1, 1996
Summary
Flatworms possess abundant FMRFamide-related peptides (FaRPs) in their nervous systems. Research reveals limited FaRP diversity within individual flatworm species, unlike other invertebrates.
Area of Science:
- Zoology
- Neurobiology
- Biochemistry
Background:
- Platyhelminths, or flatworms, exhibit a primitive but complete central nervous system.
- Their nervous systems are rich in both classical neurotransmitters and abundant peptidergic components.
- FMRFamide-related peptides (FaRPs) are well-studied in mollusks and arthropods, but less so in flatworms.
Purpose of the Study:
- To investigate the presence and diversity of FMRFamide-related peptides (FaRPs) in platyhelminths.
- To characterize the structure and physiological effects of platyhelminth FaRPs.
- To compare FaRP diversity in flatworms with that in other invertebrate phyla.
Main Methods:
- Peptide isolation from various flatworm species (tapeworm Moniezia expansa, turbellarians Artioposthia triangulata and Dugesia tigrina).
- Structural determination of isolated peptides.
- Physiological studies using isolated muscle fibers to assess peptide effects.
Main Results:
- The first platyhelminth FaRP, GNFFRFamide (hexapeptide amide), was isolated from Moniezia expansa.
- Two additional FaRPs, RYIRFamide and GYIRFamide (pentapeptides), were identified in turbellarians.
- Turbellarian FaRPs induced dose-dependent contractions in isolated somatic muscle fibers.
- Platyhelminth species appear to possess a restricted complement of only 1 or 2 related FaRPs, contrasting with higher diversity in other phyla.
Conclusions:
- Platyhelminths have a distinct, albeit limited, repertoire of FMRFamide-related peptides (FaRPs).
- These FaRPs play a physiological role in muscle contraction.
- Further research is needed to fully understand platyhelminth FaRPs, including precursor cloning and receptor localization.