Abstract
Recovery of proliferative capability in gamma irradiated Colpoda cucullus (ciliated protist) resting cysts and its radiation hormesis
Highlights
The antagonistic processes of encystment and excystment constitute a cell cycle (E-E cycle), which is connected to the growth-division cell cycle (G-D cycle) (Fig. 1, A; Gutiérrez et al, 2003; Verni and Rosati, 2011)
We focus on the effect of gamma irradiation in G-D cycle following the E-E cycle when the resting cysts were irradiated
We show that resting cysts have an active biological response for repair cell damages promoted by stress, its hormesis effect, despite the fact that their metabolic activity is hardly measurable or ceased
Summary
The antagonistic processes of encystment and excystment constitute a cell cycle (E-E cycle), which is connected to the growth-division cell cycle (G-D cycle) (Fig. 1, A; Gutiérrez et al, 2003; Verni and Rosati, 2011). Encystment is a reversible cell differentiation process accompanied by drastic morphological changes (Funatani et al, 2010; Verni and Rosati, 2011) in order to build cyst specific cell structures such as a cyst wall, and cease metabolic activity (Funatani et al, 2010; Sogame et al, 2014). Such resting cysts can tolerate desiccation (Taylor and Stickland, 1936), freezing (Bychenkova et al, 1969; Uspenskaya and Lozina-Lozinski, 1979), extreme temperatures (Taylor and Stickland, 1936), ultraviolet irradiation (Uspenskaya and LozinaLozinski, 1979; Matsuoka et al, 2017), acidification (Sogame et al, 2011), and gamma irradiation (Saito et al, 2020), allowing them to survive considerable environmental stress. The capability for excystment of irradiated cysts was recovered if there was a radiation-free period (recovery period) before excystment induction (Sogame et al, 2019a)
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