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2015 ; 10
(7
): e0133278
Nephropedia Template TP
gab.com Text
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English Wikipedia
Relationship between Fibroblast Growth Factor 23 and Biochemical and Bone
Histomorphometric Alterations in a Chronic Kidney Disease Rat Model Undergoing
Parathyroidectomy
#MMPMID26186634
PLoS One
2015[]; 10
(7
): e0133278
PMID26186634
show ga
BACKGROUND: Phosphate burden in chronic kidney disease (CKD) leads to elevated
serum fibroblast factor-23 (FGF-23) levels, secondary hyperparathyroidism and
chronic kidney disease-mineral bone disorder (CKD-MBD). However dissociated
hyperphosphatemia and low serum FGF-23 concentrations have been observed in
experimentally parathyoridectomized rats. The relationships between serum
mineral, hormone, and bone metabolism may be altered in the presence of CKD. The
aim of our study was to investigate whether a consistent relationship existed
between serum FGF-23 levels, specific serum biochemical markers, and
histomorphometric parameters of bone metabolism in a parathyroidectomized CKD
animal model. RESULTS: Sprague Dawley rats were divided into 3 groups:
parathyroidectomy (PTX) and CKD (PTX+CKD, 9 rats), CKD without PTX (CKD, 9 rats),
and neither PTX nor CKD (sham-operated control, 8 rats); CKD was induced by
partial nephrectomy. At 8 weeks after partial nephrectomy, serum biomarkers were
measured. Bone histomorphometries of the distal femoral metaphyseal bone were
analyzed. The mean serum FGF-23 levels and mean bone formation rate were the
highest in the CKD group and the lowest in the PTX+CKD group. Bone volume
parameters increased significantly in the PTX+CKD group. Pearson's correlation
revealed that serum FGF-23 levels associated with those of intact parathyroid
hormone, phosphate, collagen type I C-telopeptide, and calcium. Univariate linear
regression showed that serum FGF-23 values correlated with bone formation rate,
bone volume, and osteoid parameters. Stepwise multivariate regression analysis
revealed that circulating FGF-23 values were independently associated with bone
volume and thickness (? = -0.737; p < 0.001 and ? = -0.526; p = 0.006,
respectively). Serum parathyroid hormone levels independently correlated with
bone formation rate (? = 0.714; p < 0.001) while collagen type I C-telopeptide
levels correlated with osteoid parameter. CONCLUSION: Serum FGF-23 levels
independently correlated with bone volume parameters in rats with experimentally
induced CKD.