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Systematic isolation of peptide signal molecules regulating development in hydra: LWamide and PW families.
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.
The novel signal peptides, pedibin and Hym-346, lower positional value thereby enhancing foot formation in hydra.
The results suggest that peptides play signaling roles in patterning processes in cnidaria and, plausibly, in more complex metazoans as well.
Transplantation analysis of developmental mechanisms in Hydra.
  • H. Shimizu
  • Biology
    The International journal of developmental…
  • 5 June 2012
The various strains identified by Sugiyama and colleagues are reviewed, the principles and the main results deduced from the quantitative lateral transplantation strategy are discussed, and the relevance of this approach in the era of molecular biology is discussed.
Different Endosymbiotic Interactions in Two Hydra Species Reflect the Evolutionary History of Endosymbiosis
The gene expression analysis showed that oxidative stress related genes play an important role in the on-going process of endosymbiosis evolution, and showed that H. viridissima could cope with oxidative stress that caused damage, such as cell death, in H. vulgaris.
Epithelial morphogenesis in hydra requires de novo expression of extracellular matrix components and matrix metalloproteinases.
The correlation of loss of the ECM, cell shape changes and subsequent de novo biogenesis of matrix and matrix-associated components were all functionally coupled by antisense experiments in which translation of HLM-beta1 and HMMP was blocked and head regeneration was reversibly inhibited.
Innexin gap junctions in nerve cells coordinate spontaneous contractile behavior in Hydra polyps
It is concluded that a small subset of nerve cells, connected by gap junctions and capable of synchronous firing, act as a pacemaker to coordinate the contraction of the body column in the absence of ganglia.
Minimum tissue size required for hydra regeneration.
Small tissue pieces were excised from wild-type polyps of Hydra magnipapillata, allowed to regenerate, and the size-dependent characteristics of head regeneration were examined, consistent with the view that two independent factors are involved in determining the minimum tissue size for regeneration.
Peduncle of Hydra and the heart of higher organisms share a common ancestral origin
Observations indicate that the transfer of fluid by the peduncle has a similar neurological and genetic basis to the pumping of blood by the heart, suggesting that the Hydra peduncle and the heart of higher organisms share a common ancestral origin.