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Both mercury and cadmium directly influence calcium homeostasis resulting from the suppression of scale bone cells : the scale is a good model for the evaluation of heavy metals in bone metabolism
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Both mercury and cadmium directly influence calcium homeostasis resulting from the suppression of scale bone cells : the scale is a good model for the evaluation of heavy metals in bone metabolism
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Journal Article
Both mercury and cadmium directly influence calcium homeostasis resulting from the suppression of scale bone cells : the scale is a good model for the evaluation of heavy metals in bone metabolism
2004
Overview
To examine the effects of heavy metals such as cadmium and mercury on calcium homeostasis, plasma calcium and calcitonin were measured in goldfish. Cadmium induced hypocalcemia both at 4 and at 8 days. In methylmercury-treated goldfish, the plasma calcium level increased at 2 days and then decreased at 8 days. The plasma calcitonin level increased in correspondence with the increased plasma calcium by methylmercury treatment, although cadmium did not cause a significant change. To elucidate the mechanism in detail, fish scales, which have both osteoclasts and osteoblasts and are similar to mammalian membrane bone, were used in the present study. We measured tartrate-resistant acid phosphatase (TRAP) and alkaline phosphatase (ALP) activity as respective indicators of activity in both types of cells. TRAP activity in the scales decreased by treatment of cadmium and methylmercury at 6 h incubation. Particularly, cadmium (even at 10(-13) M) significantly suppressed TRAP activity, suggesting that this system is utilized as an acute biosensor for cadmium. ALP activity decreased after exposures of 64 and 96 h, although the activity did not change after 6, 18, and 36 h. In addition, mRNA expression of the estrogen receptor and insulin-like growth factor 1, which participate in osteoblastic growth and differentiation, was less than the control values by treatment with both metals. This study demonstrates that mercury directly acts on the bone cells and influences calcium homeostasis and indicates that, in a short-term exposure, mercury has a different action from that of cadmium and induces hypercalcemia.
Publisher
Springer,Springer Nature B.V
Subject
Acid Phosphatase - drug effects
/ Alkaline Phosphatase - drug effects
/ Animals
/ Biological and medical sciences
/ Bone and Bones - drug effects
/ Cadmium
/ Calcium
/ Diseases of the osteoarticular system
/ Female
/ Goldfish - anatomy & histology
/ Hypocalcemia - chemically induced
/ Insulin-Like Growth Factor I - drug effects
/ Insulin-Like Growth Factor I - genetics
/ Male
/ mercury
/ Metallothionein - drug effects
/ Metals
/ Methylmercury Compounds - pharmacology
/ Plasma
/ Receptors, Estrogen - drug effects
