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2017 ; 23
(4
): 314-324
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Fibrosis and Fibrotic Gene Expression in Pediatric and Adult Patients With
Idiopathic Dilated Cardiomyopathy
#MMPMID27890770
Woulfe KC
; Siomos AK
; Nguyen H
; SooHoo M
; Galambos C
; Stauffer BL
; Sucharov C
; Miyamoto S
J Card Fail
2017[Apr]; 23
(4
): 314-324
PMID27890770
show ga
BACKGROUND: Although fibrosis seems to be prognostic for adverse outcomes in
adults with idiopathic dilated cardiomyopathy (IDC), little is known about the
prevalence and development of fibrosis in pediatric IDC hearts. We hypothesized
that there is less activation of fibrosis at a molecular level in pediatric IDC
hearts than in failing adult hearts. METHODS AND RESULTS: Pediatric hearts were
analyzed histologically to determine the prevalence of fibrosis. Left ventricular
tissue from adult and pediatric IDC hearts and adult and pediatric nonfailing
(NF) hearts were subjected to quantitative reverse-transcription polymerase chain
reaction to study the expression of important mRNAs that affect fibrosis. We
found age-specific differences between IDC and NF hearts in the regulation of
noncoding galectin-3, Corin, matrix metalloproteinase (MMP) 2, MMP-9, tissue
inhibitor of metalloproteinase (TIMP) 2, and TIMP-3. We also found markers that
were similarly altered in both adult and pediatric IDC hearts (interleukin-1
receptor-like 1 receptor, TIMP-1, and TIMP-4). Finally, microRNAs 29a-c were
significantly decreased in the pediatric IDC patients. CONCLUSIONS: Pediatric IDC
patients demonstrate age-specific differences in the molecular pathways
implicated in fibrosis in the adult heart. At the ultrastructural level the
unique gene expression pattern appears to limit fibrosis in the failing pediatric
heart.