TY - JOUR
T1 - Juvenile tilapia (Oreochromis mossambicus) strive to maintain physiological functions after waterborne copper exposure
AU - Wu, Su Mei
AU - Ding, Hui Ru
AU - Lin, Li Yih
AU - Lin, Yu Siang
PY - 2008/4
Y1 - 2008/4
N2 - Juvenile tilapia were acutely exposed to 0.2 and 2 mg/L Cu2+ for up to 144 h. The Na+-K+-ATPase (NKA)-specific activity in the gills of tilapia exposed to 0.2 mg/L Cu2+ significantly decreased over 48-72 h and was restored to the control level after 96 h, but was again depressed during 120-144 h. The whole-body Cl- levels significantly decreased after 48 h, but recovered shortly afterwards and continued to do so until 144 h with 0.2 mg/L Cu exposure. During 48-72 h, the numbers of the wavy-convex type of mitochondria-rich (MR) cells appeared to significantly increase and the cortisol content also significantly increased. Changes in MR cell morphology might be necessary in order to enhance Cl - uptake, and this might be related to changes in cortisol levels. Whole-body Na+ concentrations had significantly decreased by 72 h, but recovered during 96-144 h. Whole-body Cu2+ concentrations also significantly increased compared to the initial concentration during 72-144 h of Cu exposure. All measured parameters (NKA activity, Na+ concentration, and MR cell numbers) significantly decreased in fish exposed to 2 mg/L Cu, and no recovery was observed. These data demonstrate that juvenile tilapia strived to maintain physiological functions after exposure to sub-lethal concentrations of Cu.
AB - Juvenile tilapia were acutely exposed to 0.2 and 2 mg/L Cu2+ for up to 144 h. The Na+-K+-ATPase (NKA)-specific activity in the gills of tilapia exposed to 0.2 mg/L Cu2+ significantly decreased over 48-72 h and was restored to the control level after 96 h, but was again depressed during 120-144 h. The whole-body Cl- levels significantly decreased after 48 h, but recovered shortly afterwards and continued to do so until 144 h with 0.2 mg/L Cu exposure. During 48-72 h, the numbers of the wavy-convex type of mitochondria-rich (MR) cells appeared to significantly increase and the cortisol content also significantly increased. Changes in MR cell morphology might be necessary in order to enhance Cl - uptake, and this might be related to changes in cortisol levels. Whole-body Na+ concentrations had significantly decreased by 72 h, but recovered during 96-144 h. Whole-body Cu2+ concentrations also significantly increased compared to the initial concentration during 72-144 h of Cu exposure. All measured parameters (NKA activity, Na+ concentration, and MR cell numbers) significantly decreased in fish exposed to 2 mg/L Cu, and no recovery was observed. These data demonstrate that juvenile tilapia strived to maintain physiological functions after exposure to sub-lethal concentrations of Cu.
KW - Compensation
KW - Copper
KW - Sodium pump
KW - Teleost
UR - http://www.scopus.com/inward/record.url?scp=40549087898&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=40549087898&partnerID=8YFLogxK
U2 - 10.1007/s00244-007-9038-9
DO - 10.1007/s00244-007-9038-9
M3 - Article
C2 - 17896125
AN - SCOPUS:40549087898
SN - 0090-4341
VL - 54
SP - 482
EP - 492
JO - Archives of Environmental Contamination and Toxicology
JF - Archives of Environmental Contamination and Toxicology
IS - 3
ER -