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Large-scale mortality and limited expression of heat shock proteins of aestivating sea cucumbers Apostichopus japonicus after acute salinity decrease

文献类型： 外文期刊

作者： Meng, Xian-Liang 1 ; Dong, Yun-Wei 2 ; Dong, Shuang-Lin 3 ;

作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao, Peoples R China

2.Xiamen Univ, Coll Ocean & Earth Sci, State Key Lab Marine Environm Sci, Xiamen 361005, Peoples R China

3.Ocean Univ China, Coll Fisheries, Key Lab Mariculture, Minist Educ, Qingdao, Peoples R China

关键词： aestivation;hsp70;hsp90;osmotic pressure;salinity;sea cucumber

期刊名称：AQUACULTURE RESEARCH （ 影响因子：2.082； 五年影响因子：2.415 ）

ISSN：

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收录情况： SCI

摘要： This study deals with the mortality and related physiological responses of aestivating sea cucumber Apostichopus japonicus to acute salinity decrease. Aestivating and active sea cucumbers were exposed to a decrease in salinity (from 30 to 20psu) at a rate of 2.5psu every 6h, and then maintained at 20psu for 96h. The mortality of aestivating sea cucumbers was 30%, which was significantly higher than that of active sea cucumbers (10%). This result indicated that sea cucumbers in aestivation were more susceptible to hypo-salinity stress. To elucidate the underlying physiological mechanisms, the osmotic pressure in coelomic fluid and the levels of hsp70 and hsp90 mRNA in aestivating and active sea cucumbers were measured. No significant difference in osmoregulation was observed between the two groups. The osmotic pressure of coelomic fluid in both groups changed with decrease in ambient salinity. There were significant differences in the time course and magnitude of hsp70 and hsp90 expression between the two groups. After exposure to decreased salinity, aestivating sea cucumbers showed a delayed up-regulation of hsp70 and hsp90 expression compared with animals in active state, and these levels decreased rapidly to control values. The expression of hsp70 and hsp90 in aestivating sea cucumbers were significantly lower than those in active sea cucumbers after salinity change. The differences in hsp70 and hsp90 expression between the states may partly explain the higher mortality of sea cucumbers in aestivation when exposed to low salinity.

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