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Immunocytochemical localization of histamine in flatworms
M Wikgren1, M Reuter, M K Gustafsson
1Department of Biology, Abo Akademi, Finland.
Cell and Tissue Research
|May 1, 1990
Summary
Histamine, a key neuroactive substance, was found in the nervous systems of three flatworm species. This discovery highlights histamine
Area of Science:
- Neuroscience
- Zoology
- Immunohistochemistry
Background:
- Histamine is a crucial biogenic amine involved in various physiological processes.
- Its presence and role in invertebrates, particularly primitive bilaterians like flatworms, are not well-understood.
Purpose of the Study:
- To investigate the occurrence and cellular localization of histamine-like immunoreactivity in different flatworm species.
- To understand the potential role of histamine in the nervous system of Platyhelminthes.
Main Methods:
- Utilized specific antibodies against histamine for immunohistochemical staining.
- Examined three species: Diphyllobothrium dendriticum (parasitic cestode), Microstomum lineare, and Polycelis nigra (free-living turbellarians).
Main Results:
- Histamine-like immunoreactivity was detected in neurons of the main nerve cords and excretory ducts of Diphyllobothrium dendriticum.
- In Microstomum lineare and Polycelis nigra, immunoreactivity was confined to the nervous system's cells and fibers.
- Demonstrated the presence of histamine or a related compound in the nervous tissue of these flatworms.
Conclusions:
- Histamine is present in the nervous system of diverse flatworm species, including parasitic and free-living forms.
- This suggests a conserved and important role for histamine as a neuroactive substance in early bilaterian animals.
- Provides insights into the evolution of neurochemical signaling in the animal kingdom.