Expression profile of heat shock protein 70 in indigenous Huainan partridge chicken exposed to low temperature

Xing Yong Chen; Juan Juan Niu; Run Shen Jiang; Zhao Yu Geng
April 2014
Italian Journal of Animal Science;2014, Vol. 13 Issue 2, p235
Academic Journal
It is clear that heat shock protein 70 (HSP70) is responsible for stressful conditions. However, the expression level and profile of HSP70 during cold stress are still unknown. In this study, the expression profile of HSP70 in the heart, liver, muscle and spleen of Huainan partridge chicken exposed to low temperature was investigated. HSP70 expression was showed tissue-dependent with highest expression in muscle, followed by liver and heart; conversely, there was no evidence of changes in spleen, where there were two expression peaks during cold stress, before 3 and after 72 h, respectively. The plasma creatine kinase (CK) activity exhibited a significant increase (P<0.01) after 1 h of cold stress exposure, and then decreased till to the lowest level after 72 h of cold stress exposure. On the other hand, nitric oxide content arose and reached the peak level (P<0.01) after 3 h of cold stress exposure, and then suddenly decreased to the original level with the duration of exposure time. In conclusion, mRNA expression of HSP70 turned out to be tissueand time-dependent in muscle, liver and heart in broilers under cold stress exposure. The distinct expression of HSP70 suggested that highenergy supply and balance of CK activity might be responsible for the HSP70 high expression. poultry. Little neglect would cause body and/or uniformity not to meet the professional standards, and then affect the production performances (Yahav, 2000). The extent of the deleterious effects of cold stress is determined not only by its magnitude but also by the status of cellular defense systems, particularly the cellular anti-oxidation. Both biotic and abiotic stress can induce nitric oxide (NO) synthesis and in turn mediate the reaction of hydrogen peroxide and accelerate oxidation. Such oxidation will increase the number of reactive oxygen metabolites (ROM) that can attack and irreparably damage membrane composition and permeability (Omar and Pappolla, 1993). Chickens have high metabolic rate but no sweat glands, so they are more sensitive to ambient temperatures. Stress responses and damage of liver and heart occurred in broilers, which were suddenly exposed to low temperatures (Lin et al., 2006). A common event observed in chicken during thermo-resistance was the high expression of heat shock protein (HSP) genes (Mahmoud et al., 2003; Hagiwara et al., 2007). Many studies have shown the importance of HSPs for the survival of cells under stress conditions. As universal cytoprotective proteins, HSPs expression may enhance stress tolerance and thereby increase the survival rate of stressed cells (Latchman, 2001). However, studies on the expression of heat shock protein 70 (HSP70) during cold stress were highly diverse. Some suggested that HSP70 only expressed after rewarming (Liu et al., 1995; Laios et al., 1997; Gabriel et al., 2003), and others implied a tissue-dependent expression (Givisiez et al., 2001). The expression profile of HSP70 in chicken tissue during cold stress is still unknown. In the present study, the mRNA expression level of HSP70 in the heart, liver, muscle and spleen of Huainan partridge chicken - a Chinese indigenous breed that was subjected to cold stress - was investigated. Plasma NO and creatine kinase (CK) were also measured for monitoring of oxidative stress and cell membrane damage.


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