Physiological changes leading to anhydrobiosis improve radiation tolerance in Polypedilum vanderplanki larvae

High tolerance against various extreme environments exhibited by some anhydrobionts might be due to being almost completely desiccated, a state where little or no chemical reactions occur. We have shown that anhydrobiotic larvae of Polypedilum vanderplanki have higher tolerance against both high- an...

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Published in:Journal of insect physiology 2007-06, Vol.53 (6), p.573-579
Main Authors: Watanabe, Masahiko, Nakahara, Yuichi, Sakashita, Tetsuya, Kikawada, Takahiro, Fujita, Akihiko, Hamada, Nobuyuki, Horikawa, Daiki D., Wada, Seiichi, Kobayashi, Yasuhiko, Okuda, Takashi
Format: Article
Language:English
Subjects:
Anhydrobiosis
Animals
body water
chemical composition
Chironomidae - metabolism
Chironomidae - physiology
Chironomidae - radiation effects
Dehydration
dehydration (animal physiology)
gamma radiation
irradiation
Larva
larvae
larval desiccation
larval rehydration
linear energy transfer radiation
metabolism
Polypedilum
Polypedilum vanderplanki
radiation resistance
Radiation tolerance
Radiation Tolerance - physiology
Trehalose
Trehalose - metabolism
Water content
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Summary:High tolerance against various extreme environments exhibited by some anhydrobionts might be due to being almost completely desiccated, a state where little or no chemical reactions occur. We have shown that anhydrobiotic larvae of Polypedilum vanderplanki have higher tolerance against both high- and low-linear energy transfer (LET) radiation than hydrated larvae. It is of great interest to know how the desiccating larvae gain radiation tolerance. We therefore examined effects of high-LET radiation on four kinds of larvae: (1) normal hydrated (intact) larva, (2) intermediates between the anhydrobiotic and normal hydrated state, (3) almost completely dehydrated (anhydrobiotic) larvae, and (4) immediately rehydrated larvae that are assumed to have a similar molecular profile to anhydrobiotic larvae. The intermediates and immediately rehydrated larvae survived longer after high-LET radiation than intact larvae, indicating that radiation tolerance could be enhanced even in hydrated larvae. Physiological changes toward anhydrobiosis, e.g. accumulation of protectants or increasing damage repair capacity, correlate with improved radiation tolerance in hydrated larvae. In addition, almost complete desiccation further enhanced radiation tolerance, possibly in a different way from the hydrated larvae.
ISSN:0022-1910
1879-1611
DOI:10.1016/j.jinsphys.2007.02.008