کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2131047 1086618 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cell aging-induced methionine oxidation causes an autocrine to paracrine shift of the pheromone activity in the protozoan ciliate, Euplotes raikovi
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی تحقیقات سرطان
پیش نمایش صفحه اول مقاله
Cell aging-induced methionine oxidation causes an autocrine to paracrine shift of the pheromone activity in the protozoan ciliate, Euplotes raikovi
چکیده انگلیسی

Ciliates of the genus Euplotes rely on the autocrine (self) and paracrine (non-self) activities of their water-borne protein pheromones to control the two fundamental phenomena of their life cycle, i.e. vegetative (mitotic) growth and sex manifested as cell union in mating pairs. We observed that cell aging determines the synthesis of increasing concentrations of pheromones that are oxidized at the level of methionine residues which are more exposed on the molecular surface. The oxidized form of the E. raikovi pheromone Er-1 was purified and its interactions with its source cells were shown no longer to be of autocrine type directed to promote cell growth, but changed to interactions of the paracrine type directed to induce cell unions in mating pairs of the selfing type (i.e. involving genetically identical cells). These pairs generate viable offspring, like pairs formed between genetically different cells. It was therefore concluded that aging cells may paradoxically gain beneficial effects from the synthesis of oxidized forms of their pheromones. By undergoing mating in response to the interactions with these forms, they can re-initiate a new life cycle and, in fact, rejuvenate.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Cell Research - Volume 318, Issue 2, 15 January 2012, Pages 144–151
نویسندگان
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