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首页> 外文期刊>Environmental toxicology and chemistry >FIELD CONTAMINATION OF THE STARFISH ASTERIAS RUBENS BY METALS. PART 2: EFFECTS ON CELLULAR IMMUNITY
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FIELD CONTAMINATION OF THE STARFISH ASTERIAS RUBENS BY METALS. PART 2: EFFECTS ON CELLULAR IMMUNITY

机译：金属对海星紫胶的现场污染。第2部分：对细胞免疫的影响

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摘要

To study the effects of metals on starfish in field conditions, immune responses were measured in starfish from natural populations along a metal pollution gradient (long-term contamination) and in starfish that were transferred up the gradient (short-term contamination). Coelomic amoebocyte concentration (CAC) and production of reactive oxygen species (ROS) by amoebocyles were measured in two varieties of Asterias rubens occurring in the fjord: The black variety which lives only in the low salinity upper waters (22―26per thousand) and the red variety which live both in the upper layer and in the deeper layer characterized by a salinity close to that of seawater (30per thousand). The studied immune responses were stimulated in starfish living along the metal pollution gradient according to the contamination of these starfish by cadmium. However, the sensitivity of these responses toward metals appeared to be strongly modulated by the salinity stress. In red starfish living at 30per thousand and transferred up the contamination gradient, the immune responses were inhibited and closely followed the short-term accumulation of metals in the animal organs. Starfish transferred down the gradient did not recover normal immune responses in the short-term and appeared highly sensitive to caging stress. It is suggested that the impact of metals on the immune responses of A. rubens in field conditions occurs in three phases. Short-term inhibitory effects are exerted by a direct action of metals on the immune cells and are followed by a recovery due to the induction of protective mechanisms. Eventually, when these mechanisms are overwhelmed by a long-term contamination, indirect and durable stimulatory effects on the immune responses appear due to a global disruption of the animal physiology.
机译：为了研究田间条件下金属对海星的影响，测量了自然种群中沿金属污染梯度（长期污染）的海星和向上迁移至梯度（短期污染）的海星的免疫反应。在峡湾中发生的两个红天蛾变种中，测量了变形虫细胞的空肠成血细胞浓度（CAC）和活性氧物质（ROS）的产生：黑色变种仅生活在低盐度的上层水域（22-26 /千），上层和下层都生活着的红色品种，其盐度接近海水（每千分之三十）。根据镉对这些海星的污染，在沿金属污染梯度生活的海星中刺激了所研究的免疫反应。但是，这些反应对金属的敏感性似乎受到盐度应力的强烈调节。在生活在30/1000的红海星中并向上转移到污染梯度中，免疫反应受到抑制，并密切跟踪动物器官中金属的短期积累。沿梯度向下转移的海星短期内无法恢复正常的免疫反应，并且对笼养应激表现出高度敏感性。建议在田间条件下金属对红曲霉免疫反应的影响分为三个阶段。金属对免疫细胞的直接作用会产生短期抑制作用，随后由于诱导保护机制而恢复。最终，当这些机制被长期污染所淹没时，由于对动物生理的全面破坏，对免疫反应产生了间接和持久的刺激作用。

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