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Eur J Protistol

Title:		"Behavioural changes induced by the conjugation-inducing pheromones, gamone 1 and 2, in the ciliate Blepharisma japonicum"
Author(s):		Sugiura M; Shiotani H; Suzaki T; Harumoto T;
Address:		"Department of Biology, Graduate School of Science, Kobe University, Kobe 657-8501, Japan"
Journal Title:		Eur J Protistol
Year:		2010
Volume:		20100218
Issue:		2
Page Number:		143 - 149
DOI:		10.1016/j.ejop.2010.01.002
ISSN/ISBN:		1618-0429 (Electronic) 0932-4739 (Linking)
Abstract:		"Preconjugant interactions between complementary mating-type cells in ciliates occur before sexual reproduction. The interactions include retardation of swimming behaviour, courtship dancing, chemoattraction, nuclear activation, cell division, or cell agglutination, depending on ciliate species. In Blepharisma japonicum, chemoattraction of mating-type I by mating-type II has been reported previously. It has been shown that chemoattraction here is caused by a conjugation-inducing substance called gamone 2 secreted by mating-type II cells. In this study, we show that mating-type II cells accumulate near the site where gamone 1 secreted by mating-type I cells is present at a high concentration. We also show that the behaviour of individual cells changes when exposed to the complementary mating-type gamone; cells begin to rotate and swim slowly, thus shortening their minimum path length (final displacement of a cell from its origin). These results suggest that gamones 1 and 2 induce behavioural changes in type II and I cells, respectively, and that gamone-stimulated cells may accumulate at the site with the highest activity of the complementary gamone, after repetition of swimming changes in the gradient of gamone concentration. This reciprocal induction of the changes in behaviour may increase the probability of sexual encounters for conjugation"
Keywords:		"Aminophenols Ciliophora/*drug effects/*physiology *Conjugation, Genetic Glycoproteins/*pharmacology Hydroxybenzoates/*pharmacology Intercellular Signaling Peptides and Proteins Lactates Locomotion Pheromones/*pharmacology;"
Notes:		"MedlineSugiura, Mayumi Shiotani, Hiromi Suzaki, Toshinobu Harumoto, Terue eng Research Support, Non-U.S. Gov't Germany 2010/02/20 Eur J Protistol. 2010 May; 46(2):143-9. doi: 10.1016/j.ejop.2010.01.002. Epub 2010 Feb 18"