Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:3.4.24.35 (matrix metalloproteinase 9)
 2,207 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Several proteinases from different multigene families have been implicated in the uterine invasion required for establishment of pregnancy in some mammals. In this study, the expression of matrix metalloproteinase gelatinase B (MMP-9), urokinase-type plasminogen activator (uPA) and their inhibitors was investigated during early mouse embryo development. Transcripts for tissue inhibitors of metalloproteinases (TIMP-1,-2,-3) and uPA receptor were detected throughout pre- and peri-implantation development whilst MMP-9 and uPA mRNAs were first detected in peri-implantation blastocysts associated with the invasive phase of implantation. Through use of in situ hybridization, it was shown that MMP-9 transcripts were strongly expressed in the network of trophoblast giant cells at the periphery of implanting 7.5 day embryos and TIMP-3 transcripts were strongly expressed in the decidua immediately adjacent to the implanting embryo. uPA transcripts were preferentially expressed in the ectoplacental cone and its derivatives. Because these proteinases are regulated by growth factors and cytokines in other tissues, the effect of leukaemia inhibitory factor (LIF) and epidermal growth factor (EGF) on their activity was investigated. Both LIF and EGF, like the proteinases, have been implicated in peri-implantation development. Blastocysts collected on day 4 of pregnancy were cultured 2 days in TCM 199 + 10% fetal bovine serum to allow outgrowth followed by 24 hour culture in defined media containing either LIF or EGF. Conditioned media were assayed for uPA activity by a chromogenic assay and MMP activity by gelatin zymography. Both LIF and EGF stimulated uPA and MMP-9 activity in blastocyst outgrowths after 3 days of culture (day 7). Proteinase activity was assayed again at the 5th to 6th day of culture (day 9 to 10). EGF was found to have no effect whereas LIF decreased production of both proteinases. These results demonstrate that proteinase activity in early embryos can be regulated by growth factors and cytokines during the implantation process and, in particular, they demonstrate the possible involvement of LIF in establishment of the correct temporal programme of proteinase expression.
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PMID:Proteinase expression in early mouse embryos is regulated by leukaemia inhibitory factor and epidermal growth factor. 774 17

Contrast-enhanced MRI in patients with MS shows that increased permeability of the blood-brain barrier (BBB) commonly occurs. The changes in capillary permeability often precede T2-weighted MRI evidence of tissue damage. In animal studies, intracerebral injection of the matrix metalloproteinase (MMP) 72-kDa type IV collagenase (gelatinase A) opens the BBB by disrupting the basal lamina around capillaries. Steroids affect production of endogenous MMPs and tissue inhibitors to metalloproteinases (TIMPs). To determine the role of MMP activity in BBB damage during acute exacerbations of MS, we measured MMPs in the CSF of patients with MS. Patients (n = 7) given steroids to treat an acute episode of MS had CSF sampled before and after 3 days of methylprednisolone (1 g/day). Patients had a graded neurologic examination and gadolinium-enhanced MRI before treatment. CSF studies included total protein, cell count, and a demyelinating profile. We measured levels of MMPs, urokinase-type plasminogen activator (uPA), and TIMPs by zymography, reverse zymography, and Western blots. The MMP, 92-kDa type IV collagenase (gelatinase B), fell from 216 +/- 70 before steroids to 54 +/- 26 relative lysis zone units (p < 0.046) after treatment. Similarly, uPA dropped from 3880 +/- 800 to 2655 +/- 353 (p < 0.03). Four patients with gadolinium enhancement on MRI had the most pronounced drop in gelatinase B and uPA. Western immunoblots showed an increase in a complex of gelatinase B and TIMPs after treatment, suggesting an increase in a TIMP (p < 0.05). Reverse zymography of CSF samples showed that steroids increased a TIMP with a molecular weight similar to that of mouse TIMP-3 (p = 0.053). Our results suggest that increased gelatinase B is associated with an open BBB on MRI. Steroids may improve capillary function by reducing activity of gelatinase B and uPA and increasing levels of TIMPs.
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PMID:Effect of steroids on CSF matrix metalloproteinases in multiple sclerosis: relation to blood-brain barrier injury. 864 61

The migration and proliferation of vascular smooth muscle cells (SMCs) during neointima formation in atherosclerosis and angioplasty restenosis is mediated by certain growth factors and cytokines, one action of which may be to promote basement-membrane degradation. To test this hypothesis further, the effects of such growth factors and cytokines on the synthesis of two basement-membrane-degrading metalloproteinases, namely the 72 kDa gelatinase (MMP-2, gelatinase A) and the 95 kDa gelatinase (MMP-9, gelatinase B) and three tissue inhibitors of metalloproteinases (TIMPs) was studied in primary cultured rabbit aortic SMCs. Expression of the 95 kDa gelatinase was increased by phorbol myristate acetate, foetal calf serum, thrombin and interleukin-1alpha (IL-1alpha); platelet-derived growth factor (PDGF) BB alone had no effect but acted synergistically with IL-1alpha. A selective protein kinase C inhibitor, Ro 31-8220, abolished induction of the 95 kDa gelatinase. In contrast, none of the agents tested modulated the synthesis of the 72 kDa gelatinase. We conclude that maximal up-regulation of 95 kDa gelatinase expression requires the concerted action of growth factors and inflammatory cytokines mediated, in part, by a protein kinase C-dependent pathway. TIMP-1 and TIMP-2 were highly expressed, and their synthesis was not affected by growth factors or cytokines. Expression of TIMP-3 mRNAs was, however, increased by PDGF and transforming growth factor beta, especially in combination. Divergent regulation of gelatinase and TIMP expression implies that either net synthesis or net degradation of basement membrane can be mediated by appropriate combinations of growth factors and cytokines.
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PMID:Divergent regulation by growth factors and cytokines of 95 kDa and 72 kDa gelatinases and tissue inhibitors or metalloproteinases-1, -2, and -3 in rabbit aortic smooth muscle cells. 867 Jan 28

Gelatinase B, a matrix metalloproteinase (MMP) of high specific activity, is highly expressed and activated by mouse blastocysts in culture, and inhibition of this enzyme activity inhibits lysis of extracellular matrix (Behrendtsen, O., Alexander, C. M. and Werb, Z. (1992) Development 114, 447-456). Because gelatinase B expression is linked to invasive potential, we studied the expression of gelatinase B mRNA and protein in vivo, in implanting trophoblast giant cells, and found that it was expressed and activated during colonization of the maternal decidua. mRNAs for several other MMPs (stromelysin-1, stromelysin-3 and gelatinase A) and MMP inhibitors (TIMP-1 and TIMP-2) were expressed in the undifferentiated stroma toward the outside of the decidua, and TIMP-3 mRNA was expressed in primary and some mature decidual cells during their differentiation. Both mRNA and TIMP-3 protein were present at high concentrations transiently, and declined from 6.5 days post coitum onward, as the cells underwent apoptosis during the main period of gelatinase B expression and ectoplacental growth and expansion. To assess the function of MMPs during implantation and decidual development, we either injected a peptide hydroxamate MMP inhibitor into normal mice or studied transgenic mice overexpressing TIMP-1. In both cases, decidual length and overall size were reduced, and the embryo was displaced mesometrially. Embryo orientation was less strictly regulated in inhibitor-treated deciduae than in control deciduae. Morphogenesis and development of oil-induced deciduomas were also slowed in the presence of the inhibitor. We conclude that administration of MMP inhibitors retards decidual remodeling and growth, and we suggest that the MMPs expressed in precursor stromal cells promote their differentiation and expansion.
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PMID:Expression and function of matrix metalloproteinases and their inhibitors at the maternal-embryonic boundary during mouse embryo implantation. 867 12

Embryo implantation in the mouse is a highly orchestrated process, a key aspect of which is the invasion of trophoblast cells of the blastocyst into the maternal uterine endometrium. Invasion is facilitated via proteinases expressed by trophoblast cells and balanced by expression of inhibitors of proteinases in the maternal decidua. The predominant proteinase expressed by trophectodermal derivatives of the implanting mouse embryo is matrix metalloproteinase-9 (MMP-9; gelatinase B). Using in situ hybridization, transcripts for MMP-9 were detected in trophoblast cells of the embryo from the earliest stage of decidual formation (day 6.0) examined. MMP-9 transcripts were localized to trophoblast giant cells at the periphery of the embryo at the egg cylinder stage (day 7.0). By the neural-fold stage (day 8.5), expression was restricted to giant cells adjacent to the maternal side of the developing placenta, and by day 9.5 few MMP-9-positive cells remained. The major tissue inhibitor of metalloproteinases (TIMP) produced during this period was TIMP-3. Transcripts encoding TIMP-3 were detected from day 6.0-7.0 in the maternal decidua immediately adjacent to embryonic cells expressing MMP-9. The intensity of TIMP-3 expression in later-stage embryos declined in parallel with MMP-9 expression. Maternal TIMP-3 expression also occurred in the absence of embryonic MMP-9 expression in decidual reactions induced by parthenogenetic embryos (where MMP-9 positive cells were not detected) or in oil-induced deciduomas. These results support the hypothesis that MMP-9 is an important mediator of cellular invasiveness during embryo implantation, and that TIMP-3 serves as a regulator within the uterus to restrict invasion to the site of implantation.
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PMID:Tissue inhibitor of metalloproteinases-3 is the major metalloproteinase inhibitor in the decidualizing murine uterus. 895 84

We have investigated the role of proteinases in the developmental program of bone, cartilage, tongue muscle and epithelial differentiation and remodeling in the mandibular arch during murine embryogenesis. Expression of matrix metalloproteinases (MMPs) and their tissue inhibitors (TIMPs) was tissue-specific with little or no expression in the epithelium of tooth buds, tongue or oral cavity. Gelatinase A mRNA transcripts were strongly expressed in the perichondrium of Meckel's cartilage and mesenchymal areas of embryonic day 13-15 mandibles, whereas gelatinase B, collagenase-3, TIMP-1 and TIMP-2 mRNA were found primarily in the ossifying areas of the mandibles. The skeletal muscle of the tongue expressed stromelysin-3, TIMP-2 and TIMP-3 mRNA while stromelysin-3, TIMP-2 and gelatinase A were seen in the overlying connective tissue layer. Gelatinase A, gelatinase B, stromelysin-1, urokinase, TIMP-1 and TIMP-2 mRNA and protein activities were also detected in cultured mandibular explants. Culture of day 10 mandibular explants with a hydroxamic acid metalloproteinase inhibitor, but not with inhibitors of metalloendopeptidases (thiorphan and phosphoramidon), serine proteinases (aprotinin), cysteine proteinases (leupeptin) and urokinase (amiloride), altered mandibular morphogenesis dramatically. Development of the tongue (glossogenesis) and cartilage, but not bone or teeth was affected. Formation of the oral sulcus and fusion of the two epithelia of the medial sulcus were inhibited, and number and migration of myoblasts decreased. The resulting 'tongue-tied phenotype' indicates that MMPs are involved in epithelial morphogenesis and the migration of myoblasts to the region of the tongue. Development of the anterior segment of Meckel's cartilage was also inhibited and proteoglycan content of the cartilage was reduced by inhibiting MMPs. Our data suggest that matrix metalloproteinases play a pivotal role in the morphogenesis of structures derived from epithelium (oral sulcus), cranial paraxial mesoderm (tongue) and cranial neural crest (Meckel's cartilage).
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PMID:Matrix metalloproteinases regulate morphogenesis, migration and remodeling of epithelium, tongue skeletal muscle and cartilage in the mandibular arch. 910 68

The attachment of the blastocyst to the uterine luminal epithelium and the subsequent invasion by trophoblast cells through the stroma and deciduum occur in a highly regulated manner by remodeling of the extracellular matrix. We investigated the temporal and spatial expression of mRNAs for four matrix metalloproteinases (MMPs; MMP-2 [gelatinase A], MMP-3 [stromelysin 1], MMPs; MMP-2 [gelatinase B], and MMP-13 [collagenase 3]) and tissue inhibitors of metalloproteinases (TIMPs; TIMP-1, TIMP-2, and TIMP-3) in the mouse uterus from days 1 to 8 of pregnancy. Northern blot analyses showed the transcripts for MMP-2, MMP-3, RNA on these days. However, MMP-13 mRNA was not detected in the uterus, and only weak signals for MMP-3 mRNA were detected in the myometrium. Striking expression was observed with MMP-2 mRNA in the subepithelial stroma on days 3-5. With the progression of decidualization on day 6, signals were primarily in the secondary decidual zone. On day 8, MMP-2 mRNA was localized at the site of placenta formation in the mesometrial pole. Signals for MMP-9 mRNA were first detected in a small population of stromal cells exclusively at the site of implantation on day 5 at the antimesometrial pole. However, the most pronounced expressed was noted in trophoblast giant cells on day 8. TIMP-1 mRNA was present in the myometrium on day 1. On days 2-5, modest signals were detected in the stroma, and on days 6 and 8, they were in the secondary decidual zone. Localization of TIMP-2 mRNA was similar to that of TIMP-1 except it was restricted to the stroma on day 1. The regulation of TIMP-3 was more pronounced. While a gradual increase in signals was observed in stromal cells from days 1 to 4, strong signals were detected in antimesometrial stromal cells at the sites of blastocyst attachment on day 5. On days 6 and 7, even stronger signals were present in the primary decidual zone surrounding the embryo, and on day 8 signals were localized primarily in the mesometrial decidual bed. These results suggest that MMP-2 may participate in the early phase of decidualization and neovascularization required for placentation. The restricted MMP-9 expression in stromal cells on day 5 and in trophoblast giant cells on day 8, coupled with the expression of TIMP-3 in the stroma surrounding the embryo, suggests that a fine balance between MMP-9 and TIMP-3 may regulate trophoblast invasion in the uterus.
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PMID:Expression of matrix metalloproteinases and tissue inhibitors of metalloproteinases in the mouse uterus during the peri-implantation period. 929 79

Matrix metalloproteinases (MMPs) are implicated in the pathogenesis of inflammatory disorders of the central nervous system (CNS) whereas the contribution of the major endogenous counter-regulators of MMPs, the tissue inhibitors of the matrix metalloproteinases (TIMPs), is unclear. We investigated the temporal and spatial expression patterns in the CNS of nine MMP genes and three TIMP genes in normal mice, in mice with EAE, and in transgenic mice with astrocyte (glial fibrillary acidic protein)-targeted expression of the cytokines interleukin-3 (macrophage/microglial demyelinating disease), interleukin-6 (neurodegenerative disease), or tumor necrosis factor-alpha (lymphocytic encephalomyelitis). In normal mice, the MMPs MT1-MMP, stromelysin 3, and gelatinase B were expressed at low levels, whereas high expression of TIMP-2 and TIMP-3 was observed predominantly in neurons and in the choroid plexus, respectively. In EAE and the transgenic mice, significant induction or up-regulation of various MMP genes was observed, the pattern of which was somewhat specific for each of the models, and there was significant induction of TIMP-1. In situ localization experiments revealed a dichotomy between MMP expression that was restricted to leukocytes and possibly microglia within inflammatory lesions and TIMP-1 expression that was observed in activated astrocytes circumscribing the lesions. These findings demonstrate specific spatial and temporal regulation in the expression of individual MMP and TIMP genes in the CNS in normal and inflammatory states. The distinct localization of TIMP-1 and MMP expression during CNS inflammation suggests a dynamic state in which the interplay between these gene products may determine both the size and resolution of the destructive inflammatory focus.
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PMID:Differential expression of matrix metalloproteinase and tissue inhibitor of matrix metalloproteinase genes in the mouse central nervous system in normal and inflammatory states. 950 15

Interleukin-1 (IL-1) is expressed in human endometrium and has been shown to play an integral role in local cellular interactions during implantation. In addition, the matrix metalloproteinase (MMP) and its inhibitor, the tissue inhibitor of metalloproteinase (TIMP), are crucial during implantation, mediating in vitro trophoblast penetration, and are regulated by several cytokines expressed by trophoblast cells. We have investigated the roles of IL-1 beta and transforming growth factor-beta (TGF beta) in regulating TIMP-1, TIMP-3, and 92-kDa type IV collagenase messenger ribonucleic acid (mRNA) expression in human endometrial stromal cells using quantitative competitive PCR. Confluent stromal cell cultures treated with progesterone and estradiol for 9 days were stimulated with IL-1 beta, IL-1 beta plus anti-IL-1 beta antibody, TGF beta, and TGF beta plus anti-TGF beta antibody for an additional 24 h. Competitive complementary DNA fragments were constructed by deletion of a defined fragment from each of the target complementary DNA sequences and coamplified in quantitative competitive PCR as an internal standard. TIMP-1 and TIMP-3, but not 92-kDa type IV collagenase mRNA, were expressed in stromal cells. The 92-kDa type IV collagenase mRNA was only expressed after stimulation with IL-1 beta. IL-1 beta both augmented 92-kDa type IV collagenase mRNA expression and decreased TIMP-1 and TIMP-3 mRNA expression in a dose-dependent manner. Conversely, TGF beta augmented TIMP-1 and TIMP-3 mRNA expression, but did not affect 92-kDa type IV collagenase expression. IL-1 and TGF beta-mediated changes were both neutralized by specific antibodies. These results provide indirect evidence that IL-1 and TGF beta may play crucial roles at the embryo-maternal interface during trophoblast invasion by regulating stromal cell expression of TIMP-1, TIMP-3, and 92-kDa type IV collagenase, all of which are known to be important in trophoblast invasion.
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PMID:Cytokine-mediated regulation of 92-kilodalton type IV collagenase, tissue inhibitor or metalloproteinase-1 (TIMP-1), and TIMP-3 messenger ribonucleic acid expression in human endometrial stromal cells. 958 82

A rat model of common bile duct ligation (BDL)-induced hepatic fibrosis was used to assess the expression and activities of collagen-degrading proteinases and their inhibitors during the progression of fibrosis. Expression of four members of the matrix metalloproteinase (MMP) family (MMP-2/gelatinase A, MMP-3, MMP-9/gelatinase B, and MMP-13) and three tissue inhibitors of metalloproteinases-1, -2, and -3 (TIMP-1, TIMP-2, and TIMP-3) were evaluated by Northern blot analysis of RNA from liver tissue isolated at 0, 2, 5, 10, 20, and 30 days after either a BDL or sham operation. In addition, we analyzed free gelatinase and TIMP activities by zymography and reverse zymography, respectively. We found that the proteolytic activities of MMP-2 and MMP-9 increased by 2 days after ligation, reached maximal levels at day 10, and remained high through the study period, whereas the gelatinolytic activities in plasma were unchanged. The increase in gelatinase activities was accompanied by an increase in the TIMP mRNA transcripts. TIMP-1 transcripts appeared at day 2, increased until day 10, and remained elevated throughout the study period. TIMP-2 and TIMP-3 transcripts become detectable on day 10 and remained stable afterwards. No corresponding increase in TIMP protein activity was detected by reverse zymography. This appears to result from the formation of TIMP/MMP complexes. These findings indicate a likely surplus in the BDL model of fibrosis of free gelatinases as compared with the TIMPs. Thus, excessive TIMP production is not a sufficient explanation for the observed extracellular matrix accumulation, but complex changes in the local MMP/TIMP balance may underlie the pathomechanisms of fibrosis.
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PMID:Altered balance between matrix metalloproteinases and their inhibitors in experimental biliary fibrosis. 984 79


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