Discoordination of Hoilungia hongkongensis (Placozoa) movements in the presence of Zn2+ ions
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Abstract
Placozoa are the simplest multicellular organisms with a dynamic body plan. Calcium ions play a significant role in maintaining the integrity of these animals. We studied the effect of zinc ions on the interaction of Hoilungia hongkongensis cells. The coordination of amoeboid movement was disrupted by the addition of 20–25 μM Zn2+ ions, which led to the formation of “branched” forms of animals. Locomotor ciliated cells moved without coordination and independently of each other. Experimental research showed that the contact interaction of H. hongkongensis cells is important for coordinated movements of the organism, whereas zinc ions can compete with calcium ions, disrupting the regulation and destroying the connection between cells.
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