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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Physiol+Renal+Physiol
2014 ; 306
(11
): F1285-95
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Regulation of macromolecular modulators of urinary stone formation by reactive
oxygen species: transcriptional study in an animal model of hyperoxaluria
#MMPMID24598804
Khan SR
; Joshi S
; Wang W
; Peck AB
Am J Physiol Renal Physiol
2014[Jun]; 306
(11
): F1285-95
PMID24598804
show ga
We used an unbiased approach of gene expression profiling to determine
differential gene expression of all the macromolecular modulators (MMs)
considered to be involved in stone formation, in hyperoxaluric rats, with and
without treatment with the NADPH oxidase inhibitor apocynin. Male rats were fed
rat chow or chow supplemented with 5% wt/wt hydroxy-l-proline (HLP) with or
without apocynin-supplemented water. After 28 days, rats were euthanized and
their kidneys explanted. Total RNA was isolated and microarray analysis was
conducted using the Illumina bead array reader. Gene ontology analysis and the
pathway analyses of the genes were done using Database for Annotation,
Visualization of Integrated Discovery enrichment analysis tool. Quantitative
RT-PCR of selected genes was carried out to verify the microarray results.
Expression of selected gene products was confirmed using immunohistochemistry.
Administration of HLP led to crystal deposition. Genes encoding for fibronectin,
CD 44, fetuin B, osteopontin, and matrix-gla protein were upregulated while those
encoding for heavy chains of inter-alpha-inhibitor 1, 3, and 4, calgranulin B,
prothrombin, and Tamm-Horsfall protein were downregulated. HLP-fed rats receiving
apocynin had a significant reversal in gene expression profiles: those that were
upregulated came down while those that were downregulated stepped up. Apocynin
treatment resulted in near complete absence of crystals. Clearly, there are two
types of MMs; one is downregulated while the other is upregulated during
hyperoxaluria and crystal deposition. Apparently gene and protein expressions of
known macromolecular modulators of CaOx crystallization are likely regulated by
ROS produced in part through the activation of NADPH oxidase.