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Abstract
To study the expression level of calbindin-D28k, a kind of calcium binding protein, in the kidneys of genetic hypercalciuric stone-forming (GHS) rats and to investigate its role in idiopathic hypercalciuria (IH). Kidneys were taken out from 16 GHS rats and 6 normal control (NC) rats. Western blotting and real time quantitative PCR were used to detect the protein and mRNA expression levels of calbindin-D28k respectively. Western blotting showed that the A value of calbindin-D28k of the GHS rats was 0.49 +/- 0.02, significantly higher than that of the NC rats (0.20 +/- 0.01, P < 0.05). The 2(-(delta delta CT)) value of mRNA of calbindin-D28k of the GHS rats was 1.21, remarkably higher than that of the NC rats [with the of 2(-(delta delta CT)) value of 1.0]. There was not significant difference in the delta CT value between the two groups (P > 0.05). The up-regulation of calbindin-D28k in the GHS rats is possibly caused by hyperexpression of VDR and hypercalcinuria, and plays an important role in urine calcium reabsorption; however, it is not the key protein that results in IH.
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