Laboratory of Soil Ecology, Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
Environ Pollut. 2013 May;176:165-70. doi: 10.1016/j.envpol.2013.01.038. Epub 2013 Feb 17.
Food quality affects the food consumption rate, flux through the gut, and exposure to contaminants in animals. This study evaluated the effects of food quality on cadmium exposure in the soil collembolan Folsomia candida. Animals were exposed to constant concentrations of cadmium for 38 h via artificial food consisting of an agar medium with various concentrations of sugar (glucose), total nutrients (baker's yeast), or fungal odour (1-octen-3-ol). The expression of the gene encoding a deduced metallothionein-like motif containing protein was used as a biomarker of cadmium exposure. Glucose concentrations of 2% or higher reduced the expression levels of the biomarker. Within the range of 0.1-8% yeast, medium concentrations led to higher biomarker levels. At high concentrations of 1-octen-3-ol (2000 mg/l), feeding and the biomarker response were reduced. These results suggest that even at equivalent cadmium concentrations, food quality affects cadmium exposure by altering food consumption rates.
食品质量会影响动物的食物消耗率、肠道通量和对污染物的暴露。本研究评估了食物质量对土壤弹尾目动物 Folsomia candida 中镉暴露的影响。通过人工食物（含有不同浓度糖（葡萄糖）、总营养物（酵母）或真菌气味（1-辛烯-3-醇）的琼脂培养基），动物在 38 小时内持续暴露于恒定浓度的镉下。编码含金属硫蛋白样基序的蛋白的基因表达被用作镉暴露的生物标志物。葡萄糖浓度为 2%或更高会降低生物标志物的表达水平。在酵母浓度为 0.1-8%的范围内，中等浓度导致更高的生物标志物水平。在高浓度的 1-辛烯-3-醇（2000 毫克/升）下，摄食和生物标志物反应减少。这些结果表明，即使在等效的镉浓度下，食物质量也会通过改变食物消耗率来影响镉暴露。
