Project description:To identify putative novel specific targets of mir-199-5p, we overexpressed miR-199a-5p as well as miR-21 and a siRNA targeted against CAV1 in human HFL1 pulmonary fibroblasts (CCL-153) by transfecting them with synthetic pre-miRNAs or a synthetic “negative” pre-miRNA as control (miR-Neg). RNA samples were harvested at 48 hours post-transfection and 2 independent experiments were carried out. Additional samples correspond to HFL1 cells treated or not with 10ng/ml TGFbeta for 48 hours in the absence of serum (2 independent experiments). 2 independent experiments performed in a one color design, corresponding to 7 conditions (miR-Neg, miR-199-5p, miR-21, si-Neg, si-CAV1, control, TGFbeta) and a total of 14 samples.
Project description:To identify putative novel specific targets of mir-199-5p, we overexpressed miR-199a-5p as well as miR-21 and a siRNA targeted against CAV1 in human HFL1 pulmonary fibroblasts (CCL-153) by transfecting them with synthetic pre-miRNAs or a synthetic “negative” pre-miRNA as control (miR-Neg). RNA samples were harvested at 48 hours post-transfection and 2 independent experiments were carried out. Additional samples correspond to HFL1 cells treated or not with 10ng/ml TGFbeta for 48 hours in the absence of serum (2 independent experiments).
Project description:Idiopathic pulmonary fibrosis (IPF) is a chronic and often fatal pulmonary disorder characterized by fibroblast proliferation and the excess deposit of extracellular matrix proteins. The etiology of IPF is unknown, but a central role for microRNAs (miRNAs), a class of small non-coding regulatory RNAs, has been recently suggested. We report the upregulation of miR-199a-5p in mouse lungs undergoing bleomycin-induced fibrosis and also in human biopsies from IPF patients. Levels of miR-199a-5p were increased selectively in myofibroblasts and putative profibrotic effects of miR-199a-5p were further investigated in cultured lung fibroblasts. MiR-199a-5p expression was induced upon TGFβ exposure and ectopic expression of miR-199a-5p was sufficient to promote the pathogenic activation of pulmonary fibroblasts. CAV1, a critical mediator of pulmonary fibrosis, was established as a bona fide target of miR-199a-5p. Finally, we also found an aberrant expression of miR-199a-5p in mouse models of kidney and liver fibrosis, suggesting that dysregulation of miR-199a-5p represents a general mechanism contributing to the fibrotic process. We propose miR-199a-5p as a major regulator of fibrosis that represents a potential therapeutic target to treat fibroproliferative diseases. This SuperSeries is composed of the SubSeries listed below. Refer to individual Series
Project description:Idiopathic pulmonary fibrosis (IPF) is a chronic and often fatal pulmonary disorder characterized by fibroblast proliferation and the excess deposit of extracellular matrix proteins. The etiology of IPF is unknown, but a central role for microRNAs (miRNAs), a class of small non-coding regulatory RNAs, has been recently suggested. We report the upregulation of miR-199a-5p in mouse lungs undergoing bleomycin-induced fibrosis and also in human biopsies from IPF patients. Levels of miR-199a-5p were increased selectively in myofibroblasts and putative profibrotic effects of miR-199a-5p were further investigated in cultured lung fibroblasts. MiR-199a-5p expression was induced upon TGFβ exposure and ectopic expression of miR-199a-5p was sufficient to promote the pathogenic activation of pulmonary fibroblasts. CAV1, a critical mediator of pulmonary fibrosis, was established as a bona fide target of miR-199a-5p. Finally, we also found an aberrant expression of miR-199a-5p in mouse models of kidney and liver fibrosis, suggesting that dysregulation of miR-199a-5p represents a general mechanism contributing to the fibrotic process. We propose miR-199a-5p as a major regulator of fibrosis that represents a potential therapeutic target to treat fibroproliferative diseases. This SuperSeries is composed of the SubSeries listed below.
Project description:To identify putative novel specific targets of miR-199-5p, miR-199a-3p and miR-214-3p, we overexpressed these miRNAs in human MRC5 pulmonary fibroblasts (CCL-171) using synthetic pre-miRNAs or a synthetic “negative” pre-miRNA control (miR-Neg). RNA samples were harvested 48 hours post-transfection and 3 independent experiments were carried out.
Project description:We identified pathologically relevant miRs that exhibited abnormal VU expression and displayed their targets enriched explicitly in the VU gene signature. The biological function of these miRNAs in human epidermal keratinocytes or fibroblasts during wound repair remains unclear. To study the genes regulated by miR-96-5p, miR-218-5p, miR-424-5p, miR-450b-5p, miR-516b-5p or miR-7704, we transfected miRNA mimics into human primary epidermal keratinocytes or fibroblasts to overexpress respective miRNA expression. We performed a global transcriptome analysis of keratinocytes or fibroblasts upon miRNA overexpression using Affymetrix arrays.
Project description:To assess the impact of miR-199a-5p silencing on lung fibrogenesis, LNA-miR-199a-5p (5mg/kg) or control formulated for in vivo delivery was instilled intratracheally 4 days and 2 days before intratracheal administration of bleomycin (1 unit/kg) or PBS as well as 4 days after bleomycin or PBS treatment.
Project description:To assess whether CAV1 represents the main target associated with miR-199a-5p profibrotic activity, we designed a CAV1 target site blocker (TBS) to specifically disrupt miR-199a-5p interaction with mCAV1 3’UTR. CAV1 TSB (5mg/kg) or control formulated for in vivo delivery (Control TSB) was instilled intratracheally 4 days and 2 days before intratracheal administration of bleomycin (1 unit/kg) or PBS as well as 4 days after bleomycin or PBS treatment.