Starvation reduces the heat shock protein responses in white sturgeon larvae

文献类型： 外文期刊

第一作者： Huang, Susie S. Y.

作者： Huang, Susie S. Y.;Hung, Silas S. O.;Han, Dong;Wang, Wei-Fang

作者机构：

关键词： Nutrient supply;Thermal stress;Hsp70;Hsp90;Sturgeon larvae

期刊名称：ENVIRONMENTAL BIOLOGY OF FISHES （ 影响因子：1.844； 五年影响因子：1.839 ）

ISSN： 0378-1909

年卷期： 2012 年 93 卷 3 期

页码：

收录情况： SCI

摘要： This study investigates the responses of white sturgeon larvae (Acipenser transmontanus) to starvation and thermal stress, through the measurement of nutritional status (i.e. growth performances) and cellular biomarkers: heat shock proteins (Hsp) 70 and 90. White sturgeon larvae (25 day post hatch; initial weight 179.0 +/- 5.1 mg) were fed (20% body weight per day) or starved for 24, 48 or 72 hrs. Every 24 hrs, five larvae from each of the starved or fed treatment replicates were exposed to heat shock resulting from an increase in water temperature from 19 degrees C to 26 degrees C, at a rate of 1 degrees C per 15 min, and maintained at 26 degrees C for 4 hrs. No mortality was observed in this study. Starvation significantly (p < 0.05) decreased the body weight and body contents of energy, protein, and lipid of the experimental larvae, compared to the fed larvae. Heat shock induced the expressions of Hsp70 and Hsp90 in both the fed and starved group; however, starvation reduced the induction at all sampling points. The current study demonstrates that poor larval nutritional status, assessed by the aforementioned parameters, reduced heat shock responses to thermal stress, as measured by heat shock protein levels. Furthermore, Hsp70 and 90 are more sensitive to heat shock and starvation, respectively. This may be, in part, a result of the different functioning of the heat shock proteins in cellular stress response and warrants further study.

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