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Generation and Long-term Maintenance of Nerve-free Hydra
Published on: July 7, 2017
Ultrastructure and functional versatility of hirudinean botryoidal tissue
M de Eguileor1, A Grimaldi, G Tettamanti
1Department of Structural and Functional Biology, University of Insubria, Varese, Italy. magda.deeguileor@uninsubria.it
Tissue & Cell
|August 28, 2001
Summary
Leech botryoidal tissue transforms structurally and functionally when wounded. These cells exhibit angiogenic, secretory, and defensive activities, including iron and melanin transport to injury sites.
Area of Science:
- Invertebrate biology
- Cell biology
- Histology
Background:
- Botryoidal tissue in leeches consists of granular botryoidal cells and endothelial-like cells.
- This tissue is located in the connective tissue between the gut and body wall.
- Botryoidal tissue undergoes modifications based on the animal's life cycle needs.
Purpose of the Study:
- To investigate the functional and structural modifications of leech botryoidal tissue in response to injury.
- To characterize the cellular components and their roles in tissue repair and defense.
Main Methods:
- Histochemical analysis to identify iron and melanin granules within botryoidal cells.
- Energy-dispersive X-ray spectroscopy (EDS) to confirm the presence of calcium and iron.
- Microscopic observation of tissue structure changes in response to wounding.
Main Results:
- Botryoidal tissue transitions from cord-like structures to a pre-vascular, tubular architecture upon wounding.
- Botryoidal cells store calcium and granules containing iron or melanin.
- Cells secrete iron and exhibit angiogenic properties, forming new capillary vessels.
- Motile botryoidal cells transport melanin to the lesioned area for defense.
Conclusions:
- Stimulated leech botryoidal tissue demonstrates remarkable plasticity, engaging in angiogenesis, secretion, and defense.
- Botryoidal cells play a crucial role in wound healing and immune response in leeches.
- Intracellular calcium fluctuations appear to regulate iron secretion during the angiogenic process.
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