Short-term metal accumulation and MTLP induction in the digestive glands of
Perna virdis exposed to Zn and Cd |
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Authors: | Aimin Long Chundi Li Shaoyong Chen Wen Yan Aicui Dang Yuanyue Cheng and Dongwei Lu |
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Institution: | 1. LED laboratory, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China 2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 3. LED laboratory, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Graduate School of the Chinese Academy of Sciences, Beijing 100039, China |
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Abstract: | Time-dependent Zn and Cd accumulation and metallothionein like protein (MTLP) induction in the digestive glands of mussels,
Perna virdis, were measured under di erent exposure conditions. The initial uptake rate at start of chase ( 0) and mean residence time
( ) were calculated to determine the physiological response of organisms and their potential detoxification mechanisms. It was found
that in digestive glands, Zn had obviously higher 0 and shorter mean residence time than Cd, indicating that these two metals had
di erent accumulation dynamics even though they were very close in the periodic element table. MTLP levels in digestive glands
varied from 0.51 to 1.05 g/g ww (wet weight). The MTLP level increased continuously when mussels were exposed to low and
middle levels of Zn and Cd media, and reached maximal levels at day 4, then decreased when they were exposed to high level Zn and
Cd solutions. With regard to the fraction of Zn and Cd accumulated in the digestive glands, the ratios of soluble metal to total metal
decreased continuously after exposure in low and middle levels of Zn and Cd media, and decreased continuously in the first 4 days
and then to level o when mussels were exposed to media with high concentration of Zn and Cd. Results suggested that both MTLP
induction and metal insolubilization were detoxification processes in digestive glands of mussels. |
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Keywords: | Zn Cd Perna viridis metallothionein like protein insolubilization |
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