Distinct cellular expression pattern of annexins in Hydra vulgaris.

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Distinct cellular expression pattern of annexins in Hydra vulgaris

The annexins are a structurally related family of Ca2+ and phospholipid binding proteins whose function has not been clearly defined. Further investigations of annexin function may be enhanced by studying simpler organisms that express fewer annexin gene products. We previously characterized annexin XII from the freshwater cnidarian Hydra vulgaris (Schlaepfer, D. D., D. A. Fisher, M. E. Brandt,...

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Expression of annexins as a function of cellular growth state

Annexins are a structurally related family of Ca2+ binding proteins of undertermined biological function. Annexin I (also called lipocortin 1) is a substrate for the EGF-stimulated tyrosine kinase and is postulated to be involved in mitogenic signal transduction. To investigate further the involvement of lipocortin 1 in cell proliferation, we measured lipocortin 1 levels in normal diploid human...

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Regional modulation of the response to glutathione in Hydra vulgaris.

In the presence of prey, or upon exposure to reduced glutathione (GSH), Hydra polyps open a mouth to ingest the captured prey and close it after feeding; at rest the mouth is not evident. In previous papers we have shown that GABA, glycine and NMDA modulate the mechanisms of mouth closure through ligand-gated-ion-channel receptors that are similar to their mammalian analogues in terms of bioche...

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Ultrastructural observations of adherent cell pairs in hydra vulgaris

Previous morphological studies of cell sorting in Hydra vulgaris have considered only clusters of cells. Here, we present ultrastructural observations on the adherent region of cell pairs brought into contact (following dissociation) using a three-dimensional laser manipulator. There was a much larger area of close membrane contact between endodermal cell pairs in comparison with ectodermal cel...

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Pattern of epithelial cell cycling in hydra.

We have investigated the spatial pattern of epithelial cell cycling in a mutant strain of Hydra magnipapillata (sf-1). This strain has temperature sensitive interstitial stem cells and thus polyps containing only epithelial cells can be obtained by growth at the restrictive temperature. Epithelial animals were pulse labeled with the thymidine analog 5'-bromo-2'-deoxyuridine (Brdu) and stained w...

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ژورنال

عنوان ژورنال: Journal of Cell Biology

سال: 1992

ISSN: 0021-9525,1540-8140

DOI: 10.1083/jcb.118.4.911