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2014 ; 25
(9
): 1979-90
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Translational profiles of medullary myofibroblasts during kidney fibrosis
#MMPMID24652793
Grgic I
; Krautzberger AM
; Hofmeister A
; Lalli M
; DiRocco DP
; Fleig SV
; Liu J
; Duffield JS
; McMahon AP
; Aronow B
; Humphreys BD
J Am Soc Nephrol
2014[Sep]; 25
(9
): 1979-90
PMID24652793
show ga
Myofibroblasts secrete matrix during chronic injury, and their ablation
ameliorates fibrosis. Development of new biomarkers and therapies for CKD will be
aided by a detailed analysis of myofibroblast gene expression during the early
stages of fibrosis. However, dissociating myofibroblasts from fibrotic kidney is
challenging. We therefore adapted translational ribosome affinity purification
(TRAP) to isolate and profile mRNA from myofibroblasts and their precursors
during kidney fibrosis. We generated and characterized a transgenic mouse
expressing an enhanced green fluorescent protein (eGFP)-tagged L10a ribosomal
subunit protein under control of the collagen1?1 promoter. We developed a
one-step procedure for isolation of polysomal RNA from collagen1?1-eGFPL10a mice
subject to unilateral ureteral obstruction and analyzed and validated the
resulting transcriptional profiles. Pathway analysis revealed strong gene
signatures for cell proliferation, migration, and shape change. Numerous novel
genes and candidate biomarkers were upregulated during fibrosis, specifically in
myofibroblasts, and we validated these results by quantitative PCR, in situ, and
Western blot analysis. This study provides a comprehensive analysis of early
myofibroblast gene expression during kidney fibrosis and introduces a new
technique for cell-specific polysomal mRNA isolation in kidney injury models that
is suited for RNA-sequencing technologies.