Abstract
The electron microscopy cytochemical data have been obtained on compartmentalization of a secondary messenger, inositol (1,4,5)-triphosphate (InsP3), in receptor cells of different modalities in representatives of early multicellular animals, ctenophores Beroё cucumis and coelenterates, scyphomedusas Cyanea arctica. In the gravitation mechanoreceptor cells of the ctenophores and medusas, the inositol-containing compartments were revealed predominantly in cilia and stereocilia. The presence of uniformly distributed discrete granules of the precipitate of the enzymatic cytochemical reaction product in the light-sensitive lamellar structures of photoreceptor cells of ctenophores is discussed in the connection with the possible existence of peculiar rhodopsin–inositol complexes participating in photoreceptor processes. The peculiarities of compartmentalization of the precipitate in photo- and gravitation mechanoreceptor cells allow considering InsP3 as one of the components that that are able to contribute to development of mechanisms of modality in the ciliary receptor cells of ancient multicellular animals.
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