Migratory responses of cells belong to the most basic cell physiological activities of evolution of intercellular communication. In this process we distinguish two main phases: (i) in the first period a large set of "pure" physical effects were only present therefore several very essential locomotor responses developed to these physical factors; (ii) much later the complexity of chemical and biological signals appeared and these responses (e.g. chemotaxis) were/are far enough to perform the project. In the present chapter our objective was to discuss the following problems with a special respect to the chemotactic activity of the eukaryotic ciliate Tetrahymena pyriformis, a well known model-cell of chemotaxis: (i) characterization of chemotactic ligands (inorganic, amino acids, oligo- and polypeptides, lipids and carbohydrates) of Tetrahymena; (ii) signalling mechanisms of Tetrahymena used in chemotaxis (ligand-'chemotaxis receptor' relations, second messengers, kinasecascades); (iii) significance of paracrine and autocrine activity in chemotaxis; (iv) special phenomena based on chemotaxis (chemotactic range fitting; chemotactic selection; chemotactic drug targeting). Practical approaches (test systems, bioreactors) based on protozoan motility (e.g. bioindicator of the freshwater quality and production organic compounds on industrial level) are also discussed.
ASJC Scopus subject areas
- Arts and Humanities(all)