[Effects of small interference RNA targeting connective tissue growth factor on hypoxia-induced collagen synthesis in human lung fibroblasts]. 2009

You-juan Wang, and Yan Huang, and Hui Tang, and Xiao-jing Liu
Laboratory of Cardiovascular Diseases, West China Hospital, Sichuan University, Chengdu 610041, China.

OBJECTIVE To investigate the effects of small interference RNA (siRNA) targeting connective tissue growth factor (CTGF) on collagen synthesis induced by hypoxia in human lung fibroblasts. METHODS CTGF-siRNA expression plasmid was stablely transfected into MRC-5. The transfected cells were cultured under hypoxia condition (37 degrees C, 5% CO2, 1% O2) for 1, 2, 4, 6 and 12 hours respectively. The expression of CTGF and collagen type I was assessed by real time quantitative PCR and Western blot. RESULTS Expression of CTGF mRNA was up-regulated as early as 1 hour in control scrambled-siRNA/MRC-5 cells after exposed to hypoxia condition, which remained the elevated level up to 6 hours. Compared with control cells, the expression of CTGF mRNA and protein induced by hypoxia was decreased significantly in CTGF-siRNA/MRC-5 cells. Moreover, the deposition of collagen type I in CTGF-siRNA/MRC-5 cells was also declined. CONCLUSIONS The siRNA targeting CTGF gene could efficiently inhibit collagen deposition induced by hypoxia in human lung fibroblasts.

UI MeSH Term Description Entries
D008168 Lung Either of the pair of organs occupying the cavity of the thorax that effect the aeration of the blood. Lungs
D002478 Cells, Cultured Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others. Cultured Cells,Cell, Cultured,Cultured Cell
D005347 Fibroblasts Connective tissue cells which secrete an extracellular matrix rich in collagen and other macromolecules. Fibroblast
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012333 RNA, Messenger RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm. Messenger RNA,Messenger RNA, Polyadenylated,Poly(A) Tail,Poly(A)+ RNA,Poly(A)+ mRNA,RNA, Messenger, Polyadenylated,RNA, Polyadenylated,mRNA,mRNA, Non-Polyadenylated,mRNA, Polyadenylated,Non-Polyadenylated mRNA,Poly(A) RNA,Polyadenylated mRNA,Non Polyadenylated mRNA,Polyadenylated Messenger RNA,Polyadenylated RNA,RNA, Polyadenylated Messenger,mRNA, Non Polyadenylated
D014162 Transfection The uptake of naked or purified DNA by CELLS, usually meaning the process as it occurs in eukaryotic cells. It is analogous to bacterial transformation (TRANSFORMATION, BACTERIAL) and both are routinely employed in GENE TRANSFER TECHNIQUES. Transfections
D015536 Down-Regulation A negative regulatory effect on physiological processes at the molecular, cellular, or systemic level. At the molecular level, the major regulatory sites include membrane receptors, genes (GENE EXPRESSION REGULATION), mRNAs (RNA, MESSENGER), and proteins. Receptor Down-Regulation,Down-Regulation (Physiology),Downregulation,Down Regulation,Down-Regulation, Receptor
D015687 Cell Hypoxia A condition of decreased oxygen content at the cellular level. Anoxia, Cellular,Cell Anoxia,Hypoxia, Cellular,Anoxia, Cell,Anoxias, Cell,Anoxias, Cellular,Cell Anoxias,Cell Hypoxias,Cellular Anoxia,Cellular Anoxias,Cellular Hypoxia,Cellular Hypoxias,Hypoxia, Cell,Hypoxias, Cell,Hypoxias, Cellular
D055513 Connective Tissue Growth Factor A CCN protein family member that regulates a variety of extracellular functions including CELL ADHESION; CELL MIGRATION; and EXTRACELLULAR MATRIX synthesis. It is found in hypertrophic CHONDROCYTES where it may play a role in CHONDROGENESIS and endochondral ossification. CCN2 Protein,Hypertrophic Chondrocyte-Specific Protein 24,IGF-Binding Protein-Related Protein-2,IGFBP-8,IGFBP-rP2,Insulin-Like Growth Factor Binding Protein 8,Hypertrophic Chondrocyte Specific Protein 24,IGF Binding Protein Related Protein 2,Insulin Like Growth Factor Binding Protein 8
D024042 Collagen Type I The most common form of fibrillar collagen. It is a major constituent of bone (BONE AND BONES) and SKIN and consists of a heterotrimer of two alpha1(I) and one alpha2(I) chains. Type 1 Collagen,Type I Collagen,Collagen, Type 1,Collagen, Type I

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