数字农科院2.0

Effect of acute heat stress on calcium concentration, proliferation, cell cycle, and interleukin-2 production in splenic lymphocytes from broiler chickens

文献类型： 外文期刊

作者： Han, A. Y.;Zhang, M. H.;Zheng, S. S.;Zhao, C. F.;Feng, J. H.;Cheng, C.;Han, A. Y.;Zuo, X. L.

作者机构：

关键词： heat stress;free calcium concentration;broiler chicken;interleukin-2;cell cycle

期刊名称： POULTRY SCIENCE

ISSN： 0032-5791

年卷期： 2010 年 89 卷 10 期

页码：

收录情况： SCI

摘要： In the present study, we investigated the effects of acute heat stress on the concentration of free Ca2+ ([Ca2+](i)) and markers of cellular immunity in splenic lymphocytes from broiler chickens. Eighty 6-wk-old male broilers were randomly allocated to 2 treatments and exposed to 25 and 35 C (RH, 50 +/- 5%) for 3 h. We observed that 3 h of heat exposure (35 +/- 1 degrees C, 50 +/- 5% RH) increased the body temperature and respiratory rate of broiler chickens significantly, but plasma levels of corticosterone were not changed. Examination of [Ca2+](i) and the proliferation of splenic lymphocytes isolated from heat-stressed broiler chickens, using fura-2-acetoxymethyl ester and Cell Counting Kit-8, respectively, showed that acute heat stress caused a significant increase in [Ca2+](i) and enhanced concanavalin A-stimulated but not lipopolysaccharide-stimulated lymphocyte proliferation significantly. Flow cytometric analysis of the cell cycle and T-lymphocyte subsets (CD4(+) and CD8(+)) indicated that heat stress promoted the transition of lymphocytes from gap phase 1 to synthesis phase and increased the ratio of CD4(+) to CD8(+) of T lymphocytes. In addition, acute heat stress enhanced the secretion of interleukin-2 by splenic lymphocytes significantly. These results suggest that the effect of acute heat stress to increase the [Ca2+](i) in lymphocytes may be an early event that enhances Con A-stimulated T-cell proliferation and interleukin-2 secretion and promotes the transition of T cells from gap phase 1 to synthesis phase.

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