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Some peculiarities of lipid composition of the mechanoreceptive organ and the cilia of the mechanosensitive cells of bivalves



Some peculiarities of lipid composition of the mechanoreceptive organ and the cilia of the mechanosensitive cells of bivalves



Biokhimiya 54(11): 1821-1829



The lipid composition of the mechanoreceptive organ of two marine molluscs in comparison with other molluscan tissues and of isolated cilia of sense organ hair cells in comparison with the gill cilia has been studied. It was shown that the lipid composition of the mechanoreceptive organ differs in a number of features from that of other organs and that the ratios of individual phospholipid classes vary in cilia and intact organs. Ciliary aminophospholipids make up to .apprx.89%, whereas choline-containing phospholipids-only 6-8% of the total phospholipid pool. No qualitative phospholipid differences between sense cell cilia and gill cilia were found. However, hair cell cilia contain less phosphatidylethanolamine and choline phospholipids, but more phosphatidylserine and phosphatidylinositol. This suggests that the observed perculiarities of hair cell cilia may play a role in the maintenance of the proper arrangement of hair bundles and the distance between the cilium and stereovilli and/or in the regulation of Ca2+-dependent processes.

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