ISSN:
1573-5168
Keywords:
Notothenioidei
;
calcium
;
bone
;
efflux
;
plasma
;
vitamin D3
;
25-(OH)-D3
;
1,25-(OH)2-D3
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The Antarctic notothenioid, Pagothenia bernacchii, were found to have plasma total and free calcium levels, plasma inorganic phosphate and whole body calcium efflux rates which were similar to those seen in other teleosts. But total bone calcium was lower than reported for other teleosts. A single injection of vitamin D3 (5 ng g−1 fish) increased plasma total and plasma free calcium and these increases were associated with an increase in whole body calcium efflux and bone calcification. Conversely, the same treatment with 1,25-(OH)2-D3 reduced plasma free calcium. This seco-steroid also increased the specific activity of 45Ca in bone at 40h post-injection but did not significantly effect total bone calcium, plasma total calcium or whole body calcium efflux. 25-OH-D3 at the same dose had no effect on any of the parameters tested and none of the seco-steroids tested had any effect on plasma total inorganic phosphate. These data show that both D3 and 1,25-(OH)3-D3 can have calcitropic effects in this marine teleost and that these two forms of vitamin D can exert different effects within the same species.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00004450
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