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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 4510

G. Csaba, G. Nemeth, and P. Vargha; "Memory" of First Interaction with Physiological or Biologically Active Foreign Molecules (Benzpyrene, Gibberelline) in a Unicellular (Tetrahymena) Model System. Z.Naturforsch. 37c:1042-1044, 1982

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Gibberielline, prednisolon and benzpyrene stimulated the growth of Tetrahymena at the first interaction, while epinephrine did not. On a second exposure following upon the first 24 hr treatment after a rest period of 6 hr, epinephrine, too, developed a stimulatory action, and the other three molecules gave rise to still greater increase in the growth rate. Obviously, imprinting effected by the first interaction accounts for a greater responsiveness to physiological materials (hormones) also if these are indifferent in respect of the given function, and non-physiological, but biologically active materials can also give rise to imprinting in exposed target cells.