OBJECTIVETo investigate the relationship between the genetic polymorphisms of matrix metalloproteinase-2 (MMP-2) (-735) and matrix metalloproteinase-3 (MMP-3) (-1171) and the susceptibility to silicosis.

METHODSA case-control study was conducted in 113 patients diagnosed with stage I silicosis (case group) and 115 dust-exposed workers without silicosis (control group); the two groups had the same sex, ethnic group, and type of dust and similar age and cumulative exposure time. Polymerase chain reaction-restriction fragment length polymorphism was used to determine the genotypes of MMP-2 (-735) and MMP-3 (-1171).

RESULTSNo significant difference was observed in age, cumulative exposure time, or smoking rate between cases and controls (P > 0.05). The frequencies of genotypes C/C, C/T, and T/T at MMP-2 C-735T in the case group were 57.5% (65/113), 31.0% (35/113), and 11.5% (13/113), respectively, which were significantly different from those of the control group (69.6% (80/115), 26.9% (31/115), and 3.5% (4/115)), χ² = 6.542, P < 0.05). The frequencies of T allele in cases and controls were 27.0% and 17.0%, respectively, which were significantly different from each other χ² = 6.704, P < 0.05). Carriage of T allele at MMP-2 C-735T increased the risk of silicosis (OR = 1.811, 95% CI: 1.151-2.847). The frequencies of genotypes 6A/6A, 5A/6A, and 5A/5A at MMP-3 A-1171A were 67.2% (76/113), 24.8% (28/113), and 8.0% (9/113), respectively, in the case group, versus 59.1% (68/115), 37.4% (43/115), and 3.5% (4/115) in the control group (χ² = 5.519, P > 0.05).

CONCLUSIONGenetic polymorphism at MMP-2 C-735T is significantly associated with the development of silicosis. Carriage of T allele increases the risk of silicosis among workers exposed to dust. No significant association was found between MMP-3 A-1171A polymorphism and silicosis in this study.

Adult ; Aged ; Aged, 80 and over ; Case-Control Studies ; Genetic Predisposition to Disease ; Genotype ; Humans ; Matrix Metalloproteinase 2 ; genetics ; Matrix Metalloproteinase 3 ; genetics ; Middle Aged ; Polymorphism, Genetic ; Silicosis ; genetics

OBJECTIVETo study the effects of Tongxinluo on the expressions of matrix metalloproteinase-3 (MMP-3), MMP-9 and peroxisome proliferators-activated receptor gamma (PPARgamma) in atherosclerotic rabbits and explore the mechanism of its anti-atherosclerotic effect.

METHODSTwenty-four rabbits were randomized equally into control group, atherosclerotic model group (fed with high-fat diet for 14 weeks) and Tongxinluo group. The expressions of MMP-3, 9 and PPARgamma in the 3 groups were observed by means of immunohistochemistry.

RESULTSThe expressions of MMP-3, 9 and PPARgamma in the model group and Tongxinluo group were significantly higher than those in the control group (P<0.01). After high-fat diet feeding for 14 weeks, Tongxinluo group showed significantly lower expressions of MMP-3 and 9 but higher expression of PPARgamma than the model group (P<0.01).

CONCLUSIONTongxinluo can inhibit the expression of MMP-3 and 9 and increase the expression of PPARgamma, which might be the mechanism of its anti-atherosclerotic effect.

Animals ; Atherosclerosis ; metabolism ; Drugs, Chinese Herbal ; pharmacology ; Male ; Matrix Metalloproteinase 3 ; genetics ; metabolism ; Matrix Metalloproteinase 9 ; genetics ; metabolism ; PPAR gamma ; genetics ; metabolism ; Rabbits ; Random Allocation

BACKGROUNDReceptor interacting protein 1 (RIP1), which plays a key role in apoptosis, cell survival and programmed cell necrosis, is one of the most important proteins in the RIP family. The purpose of this study was to investigate the roles of RIP1 in the apoptosis, the generation of reactive oxygen species (ROS) and the expression of matrix metalloproteinases (MMPs) induced by ultraviolet B (UVB) in fibroblasts.

METHODSsiRNA targeting RIP1 was used to silence RIP1 expression in the NIH3T3 fibroblasts. The mRNA and protein levels of MMP-1 and MMP-3, caspase-3 and -8 activities, and ROS activities were determined by reverse transcriptase-quantitative polymerase chain reaction (RT-qPCR), immunoblotting, caspase activity assay, immunofluorescence, and flow cytometry.

RESULTSThe mRNA and protein expressions of MMP-1 and MMP-3 were significantly increased in RIP1 deficient NIH3T3 cells at 24 hours after UVB treatment. At 24 hours after exposure to UVB, RIP1 deficient NIH3T3 cells presented apoptotic morphology, and the apoptosis rate was significantly increased accompanied by pronounced increase in caspase-8 and -3 activities. ROS production was inhibited by UVB at 12 hours in RIP1 deficient NIH3T3 cells.

CONCLUSIONRIP1 is involved in NIH3T3 cell damage induced by UVB via participating in the apoptosis, expression of MMPs and ROS production.

Animals ; Apoptosis ; GTPase-Activating Proteins ; genetics ; metabolism ; Matrix Metalloproteinase 1 ; genetics ; metabolism ; Matrix Metalloproteinase 3 ; genetics ; metabolism ; Matrix Metalloproteinases ; genetics ; metabolism ; Mice ; NIH 3T3 Cells ; RNA, Small Interfering ; Reactive Oxygen Species ; metabolism ; Ultraviolet Rays

OBJECTIVESTo investigate the function and possible mechanisms of PIAS3 expression on the invasion of TJ905 cells.

METHODSPIAS3 overexpression vectors were constructed and PIAS3 siRNA were chemically synthesized, which were separately transfected into TJ905 cells for upregulation or downregulation of PIAS3 expression levels in TJ905 cells. After that, the invasive effects of TJ905 cells were measured by Transwell assay, and the expression of PIAS3, tissue inhibitor of metalloproteinases (TIMP)3, matrix metalloprotease (MMP)-2, and MMP-9 were identified by Western blot.

RESULTSIn vitro transfection efficiency of plasmids and oligonucleotides were separately 85.3% ± 3.1% and 95.1% ± 2.9%. PIAS3 overexpression plasmid transfection in vitro could effectively improve the expression of PIAS3 protein in TJ905 cells and inhibit the invasion of TJ905 cells (P < 0.05), and cell penetration ratio reduced from 87.9% ± 9.3% to 37.3% ± 7.9% compared with control group, while it upregulated TIMP3 and downregulated MMP-2, MMP-9 protein expression (P < 0.05); PIAS3 siRNA transfection could inhibit the PIAS3 protein expression of TJ905 cells and promote the invasion of TJ905 cells (P < 0.05), and cell penetration ratio increased from 83.9% ± 7.1% to 93.2% ± 3.1% compared with control group, while it downregulated TIMP3 and upregulated MMP-2, MMP-9 protein expression (P < 0.05).

CONCLUSIONPIAS3 expression is closely related to the invasion properties of glioma TJ905 cells.

Cell Line, Tumor ; Genetic Vectors ; Glioma ; metabolism ; pathology ; Humans ; Matrix Metalloproteinase 2 ; metabolism ; Matrix Metalloproteinase 9 ; metabolism ; Molecular Chaperones ; genetics ; metabolism ; Neoplasm Invasiveness ; Protein Inhibitors of Activated STAT ; genetics ; metabolism ; RNA, Small Interfering ; genetics ; Tissue Inhibitor of Metalloproteinase-3 ; metabolism ; Transfection

BACKGROUND: Histone deacetylase 4 (HDAC4) regulates chondrocyte hypertrophy and bone formation. The aim of the present study was to explore the effects of HDAC4 on Interleukin 1 beta (IL-1β)-induced chondrocyte extracellular matrix degradation and whether it is regulated through the WNT family member 3A (WNT3A)/β-catenin signaling pathway. METHODS: Primary chondrocytes (CC) and human chondrosarcoma cells (SW1353 cells) were treated with IL-1β and the level of HDAC4 was assayed using Western blotting. Then, HDAC4 expression in the SW1353 cells was silenced using small interfering RNA to detect the effect of HDAC4 knockdown on the levels of matrix metalloproteinase 3 (MMP3) and MMP13 induced by IL-1β. After transfection with HDAC4 plasmids, the overexpression efficiency was examined using Real-time quantitative polymerase chain reaction (qRT-PCR) and the levels of MMP3 and MMP13 were assayed using Western blotting. After incubation with IL-1β, the translocation of β-catenin into the nucleus was observed using immunofluorescence staining in SW1353 cells to investigate the activation of the WNT3A/β-catenin signaling pathway. Finally, treatment with WNT3A and transfection with glycogen synthase kinase 3 beta (GSK3β) plasmids were assessed for their effects on HDAC4 levels using Western blotting. RESULTS: IL-1β downregulated HDAC4 levels in chondrocytes and SW1353 cells. Furthermore, HDAC4 knockdown increased the levels of MMP3 and MMP13, which contributed to the degradation of the extracellular matrix. Overexpression of HDAC4 inhibited IL-1β-induced increases in MMP3 and MMP13. IL-1β upregulated the levels of WNT3A, and WNT3A reduced HDAC4 levels in SW1353 cells. GSK-3β rescued IL-1β-induced downregulation of HDAC4 in SW1353 cells. CONCLUSION HDAC4 exerted an inhibitory effect on IL-1β-induced extracellular matrix degradation and was regulated partially by the WNT3A/β-catenin signaling pathway.
Cell Line, Tumor ; Cells, Cultured ; Chondrocytes/metabolism* ; Glycogen Synthase Kinase 3 beta/genetics* ; Histone Deacetylases/genetics* ; Humans ; Interleukin-1beta/pharmacology* ; Matrix Metalloproteinase 13/metabolism* ; Matrix Metalloproteinase 3 ; Repressor Proteins ; Wnt Signaling Pathway ; Wnt3A Protein/genetics* ; beta Catenin/metabolism*

Keloids are pathologic proliferations of the dermal layer of the skin resulting from excessive collagen production and deposition. Hepatocyte growth factor (HGF) increases the expression of matrix metalloproteinase (MMP)-1 and suppresses collagen synthesis to modulate extracellular matrix turnover. To investigate the anti-fibrotic effects of HGF, we examine the mRNA expression of collagen types I and III and matrix metalloproteinase (MMP-1, MMP-3) on human dermal fibroblast (HDF) cell lines and keloid fibroblasts (KFs, n = 5) after adding various amount of HGF protein. We also evaluated the enzymatic activity of MMP-2, MMP-9 by zymograghy. In HDFs treated with TGF-beta1 and HGF protein simultaneously, both type I and III collagen mRNA expression significantly decreased (P < 0.05). Expression of MMP-1, MMP-3 mRNA also decreased. However, the mRNA expression of MMP-1, MMP-3 significantly increased in KFs with increasing amount of HGF in dose dependent manner (P < 0.05). The enzymatic activities of MMP-2 increased with increasing HGF protein in a dose-dependent manner. However, the enzymatic activity of MMP-9 did not change. These results suggest that the anti-fibrotic effects of HGF may have therapeutic effects on keloids by reversing pathologic fibrosis.
Cells, Cultured ; Collagen Type I/genetics/metabolism ; Collagen Type III/genetics/metabolism ; Fibroblasts/drug effects/metabolism ; Hepatocyte Growth Factor/*pharmacology ; Humans ; Keloid/*metabolism/pathology ; Matrix Metalloproteinase 1/genetics/metabolism ; Matrix Metalloproteinase 2/metabolism ; Matrix Metalloproteinase 3/genetics/metabolism ; Matrix Metalloproteinase 9/metabolism ; RNA, Messenger/metabolism ; Transforming Growth Factor beta1/pharmacology

OBJECTIVE: To assess the association of 5A/6A polymorphism in the promoter region of MMP3 gene with the stability of extracellular matrix of atherosclerotic plaque. METHODS: Clinical data of 776 consecutive patients undergoing percutaneous coronary intervention (PCI) was reviewed. MMP3 gene polymorphisms and serum level of MMP3 for the second admission were collected. The target gene fragment containing MMP3 promoter region was transfected into HepG2 vector cells. The influence of the polymorphism on the expression of the MMP3 gene was determined in vitro. RESULTS: Compared with the first admission data, the proportion of mutant MMP3 genotypes (5A/5A+5A/6A) was significantly higher in patients with acute myocardial infarction (AMI) compared with the control group (37.6% vs. 24.9%, P<0.01). 64.1% of the patients carrying the 5A allele had AMI, whereas only 50.11% of those carrying the 6A allele had AMI (P<0.01). The proportion of wild-type MMP3 genotype (6A/6A) was significantly higher in the stenotic group compared with the non-restenosis group (79.5% vs. 66.5%, P<0.01). Restenosis has occurred in 9.5% of patients harboring the 5A allele compared with 16.2% in those carrying the 6A allele (P<0.01). In addition, serum level of MMP3 in the restenosis group was significantly lower than that of the non-restenosis group (P<0.01). In vitro studies confirmed that the expression of pGL2-Basic/6A was significantly lower than that of pGL2-Basic/5A. CONCLUSION The 5A/6A polymorphism in the promoter region of the MMP3 gene may influence its transcriptional activity and impact on the degradation or push-up of extracellular matrix, resulting in a difference in the stability of atherosclerosis plaques, which in turn may induce different pathological processes in AMI or restenosis after stenting.
Case-Control Studies ; Extracellular Matrix ; Genetic Predisposition to Disease ; Genotype ; Humans ; Matrix Metalloproteinase 3 ; genetics ; Percutaneous Coronary Intervention ; Plaque, Atherosclerotic ; genetics ; Polymorphism, Genetic ; Promoter Regions, Genetic

OBJECTIVES: To investigate the effects of propofol on the proliferation and invasion of glioma U87 cells and to explore the possible anti-tumor mechanisms. METHODS: The glioma U87 cells was divided into a blank group, a positive control group, and the propofol groups (1.00, 2.00 or 5.00 mmol/L). Cell counting kit-8 (CCK-8) was used to detect cell proliferation; Transwell method was used to detect the effect of propofol on invasion and migration of U87 cells; real-time PCR was used to detect the expression of microRNA-134 (miR-134); Western blotting was used to detect the expression levels of reproduction-related protein Ki-67, invasion-related protein metalloproteinase-2 (MMP-2), metalloproteinase-9 (MMP-9) and phosphatidylinositol 3 kinase (PI3K)/protein kinase B (Akt) signaling pathway-related protein. RESULTS: Compared with the blank group, the proliferation, invasion and migration capacity of U87 cells were reduced in the positive control group and the propofol groups after 48 hours (all CONCLUSIONS Propofol can decrease the proliferation rate, and the invasion and migration abilities of U87 cells, which may be achieved by up-regulation of miR-134 and suppression of PI3K/Akt signaling pathway.
Cell Line, Tumor ; Cell Movement ; Cell Proliferation ; Glioma/genetics* ; Humans ; Matrix Metalloproteinase 2/genetics* ; MicroRNAs/genetics* ; Phosphatidylinositol 3-Kinases/genetics* ; Propofol/pharmacology* ; Proto-Oncogene Proteins c-akt/genetics*

This paper is aimed to investigate the effect of titanium (Ti) particles and tumor necrosis factor alpha (TNF-alpha) on the expressions of MMP-1, 2, 3 in human synovial cells, so as to explore the possible mechanism of osteolysis post-operation of metal-on-metal total joint arthroplasty in human synovial cells induced by Ti particles. In vitro cell cultures, human synovial cells were treated by Ti particles and/or TNF-alpha. The total RNA was isolated at 2 hours after the treatment. The gene expression of MMP-1, 2, 3 was analyzed by Semi-quantitative Reverse-transcriptional PCR and quantitative real-time PCR. Cell supernatant was collected at 12, 24, 48 hours after the treatment and Gelatin zymography was performed to detect the activity of MMP-2. Compared to those in the control group (untreated), Ti particles and TNF-alpha increased the gene expression of MMP-1, 2, 3 respectively (P < 0.05), and the effect of combination of the two was even more significant (P < 0.01). The trend of activities of MMP-2 is similar with gene expression. Ti particles and TNF-alpha increased MMP-2 activities by 1.3 times and 1.5 times respectively (P < 0.05), and the combination of the two increased by 1.7 times (P < 0.01). Ti particles and TNF-alpha-induced the stimulation of MMP-1, 2, 3 expressions and MMP-2 activities in human knee joint synovial cells may be involved in aseptic loosening after metal-on-metal arthroplasty through increasing the degradation of bone matrix and declining of osseous support structure mechanics.
Cells, Cultured ; Humans ; Joint Prosthesis ; Knee Joint ; cytology ; Matrix Metalloproteinase 1 ; genetics ; metabolism ; Matrix Metalloproteinase 2 ; genetics ; metabolism ; Matrix Metalloproteinase 3 ; genetics ; metabolism ; Matrix Metalloproteinases ; genetics ; metabolism ; Particle Size ; Prosthesis Failure ; adverse effects ; RNA ; genetics ; metabolism ; Synovial Membrane ; cytology ; enzymology ; Titanium ; pharmacology ; Tumor Necrosis Factor-alpha ; pharmacology

Regulation of matrix metalloproteinases (MMPs) is important for many physiological processes involving cancers, inflammation, tissue remodeling and skin aging. Here, we report the novel finding that the expression of MMP1 mRNA is downregulated by the overexpression of miR-526b which is a member of chromosome 19 microRNA cluster (C19MC). Our analysis using reporter constructs containing the 3' untranslated region (3' UTR) of MMP1 and its mutant form showed that the region from 377-383 in the 3' UTR of MMP1 is critical for targeting by miR-526b. In addition, the expression pattern of miR-526b and MMP1 mRNA showed reverse relation between adult dermal and neonatal fibroblasts. We show for the first time that miR-526b, an miRNA belonging to C19MC, can target the 377-383 region of the MMP1 3' UTR.
3' Untranslated Regions ; Adult ; Base Sequence ; Cell Line ; Down-Regulation ; Fibroblasts/metabolism ; *Gene Expression Regulation ; HeLa Cells ; Humans ; Matrix Metalloproteinase 1/*genetics ; MicroRNAs/*genetics ; RNA, Messenger/*genetics