Systematic isolation of peptide signal molecules regulating development in hydra: LWamide and PW families.
- T. Takahashi, Y. Muneoka, T. Sugiyama
- Biology, ChemistryProceedings of the National Academy of Sciences…
- 18 February 1997
The evidence obtained so far suggests that hydra contains a large number of peptide signal molecules involved in regulating developmental or other processes in cnidaria, which can be isolated and their functions examined systematically with the new approach developed in this study.
A novel neuropeptide, Hym-176, induces contraction of the ectodermal muscle in Hydra.
The structure-activity relationship analysis showed that the sequence of FIFPGPKVamide is a minimal requirement for the myoactivity, and the intense immunoreactivity was found in the peduncle nerve cells, indicating that Hym-176 is a neuropeptide.
A novel neuropeptide, Hym-355, positively regulates neuron differentiation in Hydra.
Nerve ring of the hypostome in Hydra. I. Its structure, development, and maintenance
The anatomy and developmental dynamics of the nerve ring in the hypostome of Hydra oligatis were examined immunocytochemically with an antiserum against a neuropeptide and with neuron‐specifie monoclonal antibodies, showing that it was heterogeneous and contained at least four different subsets of neurons.
Nerve Ring of the Hypostome in Hydra: Is It an Origin of the Central Nervous System of Bilaterian Animals?
- O. Koizumi
- BiologyBrain, Behavior and Evolution
- 1 January 2007
A hypothesis, ‘the nerve ring in hydra shares a common origin with the central nervous system in bilaterian animals’, is discussed in this review and is highly possible.
Localization of the neuropeptide NGIWYamide in the holothurian nervous system and its effects on muscular contraction
- M. Inoue, R. Birenheide, O. Koizumi, Y. Kobayakawa, Y. Muneoka, T. Motokawa
- BiologyProceedings of the Royal Society of London…
- 22 May 1999
Labelled nerve fibres from the hyponeural part of the radial nerve running towards the circular muscle and from the podial nerve into the body wall dermis suggest that NGIWYamide controls both muscle and connective tissue.
Inferences of evolutionary history of a widely distributed mangrove species, Bruguiera gymnorrhiza, in the Indo-West Pacific region
- Chie Urashi, Kosuke M. Teshima, S. Minobe, O. Koizumi, N. Inomata
- BiologyEcology and Evolution
- 7 June 2013
The results indicated that these two genetic clusters derived from their ancestral population whose effective size was much larger compared to the two extant clusters and function as a geographical or land barrier to prevent gene flow between the West and East clusters.
Highly differentiated population structure of a Mangrove species, Bruguiera gymnorhiza (Rhizophoraceae) revealed by one nuclear GapCp and one chloroplast intergenic spacer trnF–trnL
The results are consistent with the hypothesis that this low genetic diversity within any local population and differentiation between the different oceans or regions are caused by very low gene flow between each of the different continents coupled with frequent fluctuation of population sizes due to the change in sea level.
Identification of jellyfish neuropeptides that act directly as oocyte maturation-inducing hormones
An evolutionary link between hydrozoan MIHs and the neuropeptide hormones that regulate reproduction upstream of MIHS in bilaterian species is proposed and it is shown that the MIH peptides are synthesised by neural-type cells in the gonad, are released following dark-light/light-dark transitions, and probably act on the oocyte surface.
Neuropeptides in coelenterates: a review
- C. Grimmelikhuijzen, D. Graff, O. Koizumi, J. A. Westfall, I. D. Mcfarlane
- Biology, ChemistryHydrobiologia
- 1 June 1991
It was shown that all 4 peptides were located in neurones, many of which were associated with smooth muscle fibres, suggesting that these peptides are transmitters or modulators at neuromuscular junctions.