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Shen J, Jiang Q, Zhang W, Xu Y, Xia W. Assessment of gelatinolytic proteinases in chilled grass carp (Ctenopharyngodon idellus) fillets: characterization and contribution to texture softening. J Sci Food Agric 2022; 102:1919-1926. [PMID: 34514605 DOI: 10.1002/jsfa.11529] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 08/25/2021] [Accepted: 09/12/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Texture softening is always a problem during chilling of grass carp fillets. To solve this problem and provide for better quality of flesh, understanding the mechanism of softening is necessary. Gelatinolytic proteinases are suspected to play an essential role in the disintegration of collagen in softening of fish flesh. In the present study, the types and contribution of gelatinolytic proteinases in chilled fillets were investigated. RESULTS Four active bands (G1, 250 kDa; G2, 68 kDa; G3, 66 kDa; G4, 29 kDa) of gelatinolytic proteinases were identified in grass carp fillets by gelatin zymography. The effect of inhibitors and metal ions revealed that G1 was possibly a serine proteinase, G2 and G3 were calcium-dependent metalloproteinases and G4 was a cysteine proteinase. The effect of the inhibitors phenylmethanesulfonyl fluoride (PMSF), l-3-carboxy-trans-2,3-epoxy-propionyl-l-leucine-4-guanidinobutylamide (E-64) and 1,10-phenanthroline (Phen) on chilled fillets revealed that gelatinolytic proteinase activities were significantly suppressed. Collagen solubility indicated that metalloproteinase and serine proteinase played critical roles in collagen breakdown during the first 3 days, and cysteine proteinase revealed its effect after 3 days. Meanwhile, during chilled storage for 11 days, the final values of shear force increased 19.68% and 24.33% in PMSF and E-64 treatments when compared to control fillets respectively, whereas the increase after Phen treatment was 49.89%. CONCLUSION Our study concluded that the disintegration of collagen in post-mortem softening of grass carp fillets was mainly mediated by metalloproteinase and to a lesser extent by serine proteinase and cysteine proteinase. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Jiandong Shen
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
- Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, China
| | - Qixing Jiang
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
- Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, China
| | - Wei Zhang
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
- Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, China
| | - Yanshun Xu
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
- Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, China
| | - Wenshui Xia
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
- Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, China
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2
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Li J, Chen H. Actin-binding Rho activating C-terminal like (ABRACL) transcriptionally regulated by MYB proto-oncogene like 2 (MYBL2) promotes the proliferation, invasion, migration and epithelial-mesenchymal transition of breast cancer cells. Bioengineered 2022; 13:9019-9031. [PMID: 35341461 PMCID: PMC9162028 DOI: 10.1080/21655979.2022.2056821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Breast cancer is the most common malignant tumor in females with high incidence and mortality. Actin-binding Rho activating C-terminal like (ABRACL) was highly expressed in several cancers. We aimed to investigate the function and mechanism of ABRACL in breast cancer. In this study, biological information analysis predicted the expression of ABRACL and MYB proto-oncogene-like 2 (MYBL2) in breast cancer tissues and their possible relationship. With the application of RT-qPCR and western blot, the mRNA and protein expression of ABRACL and MYBL2 in breast cancer cell lines were assessed. After ABRACL interference, an assessment of cell proliferation was carried out using cell counting kit (CCK)-8, colony formation, and western blot. The invasive and migratory abilities of cells were determined by transwell and wound healing assays. The epithelial-mesenchymal transition (EMT) process was assayed utilizing western blot. The relationship between ABRACL and MYBL2 was confirmed by luciferase reporter assay and chromatin immunoprecipitation (ChIP). The above experiments were done again after MYBL2 overexpression in breast cancer cells with ABRACL deletion. Results revealed that ABRACL and MYBL2 were highly expressed in breast cancer tissues and cells. ABRACL knockdown suppressed the proliferation, invasion, migration, and EMT of breast cancer cells. MYBL2 transcriptionally activated ABRACL. Besides, MYBL2 overexpression reversed the effects of ABRACL knockdown on cell malignant biological behaviors. To conclude, ABRACL could be transcriptionally regulated by MYBL2 to promote cell malignant biological behaviors in breast cancer cells, implying the potential of ABRACL being a promising target for the improvement of breast cancer therapy.
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Affiliation(s)
- Jie Li
- Department of Emergency, Hubei Maternal and Child Health Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Hui Chen
- College of Medicine, Jiaxing University, Jiaxing, Zhejiang, China
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3
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Senthamilselvan A, Ravikumar K, Mallikarjunan DY, Annadurai T, Samynathan M, Varshini RJ. Evaluation of Inhibitory Effect of Self-Etch Adhesives Incorporated with Proanthocyanidin on Cysteine Cathepsins Present in Dentin Hybrid Layer Using Gelatin Zymography: An In vitro Study. J Pharm Bioallied Sci 2021; 13:S516-S520. [PMID: 34447145 PMCID: PMC8375868 DOI: 10.4103/jpbs.jpbs_535_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Revised: 10/17/2020] [Accepted: 11/18/2020] [Indexed: 11/25/2022] Open
Abstract
Aim: The aim of the study is to evaluate the inhibitory effect of single-bottle and two-bottle self-etch adhesive system after surface pretreatment with 6.5% proanthocyanidin (PA) on cysteine cathepsins (CCs) present in dentin hybrid layer using gelatin zymography. Materials and Methods: Thirty-five samples of dentin measuring 3 mm × 3 mm were obtained from 35 caries-free human third molars which were divided into seven groups. The bonded specimens were cut vertically into 1 mm thick adhesive/dentin interfaces with microtome and were pulverized into powder and subjected to zymography analysis for enzymatic activity. Results: Group VI and VII which were positive control groups had shown thicker clear bands of 50 kDa. Group IV and V which had the administration of chlorhexidine showed thicker clear bands of 50 kDa which indicated slight activity of CCs. Group II in which PA used along with single-bottle system also showed thicker clear band of 59 kDa. CCs could be active due to strong acidic nature of monomer in this group. Group III in which PA used along with two bottle system had no band formation where there is crosslinking of catalytic and allosteric domains of enzymes by PA. Conclusion: Under the limitations of this study, PA proved as a non-specific natural inhibitor of CCs. Two-bottle system showed inhibition of CCs and single bottle system failed to inhibit their activity. Future research have to be done on the bond strength and durability of self-etch adhesives after using PA and its effect on long term survival of the restorations.
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Affiliation(s)
- Arun Senthamilselvan
- Department of Conservative Dentistry and Endodontics, Vinayaka Mission's Sankarachariyar Dental College, Vinayaka Mission's Research Foundation (Deemed to be University), Salem, Tamil Nadu, India
| | - Kaarunya Ravikumar
- Department of Conservative Dentistry and Endodontics, Vinayaka Mission's Sankarachariyar Dental College, Vinayaka Mission's Research Foundation (Deemed to be University), Salem, Tamil Nadu, India
| | - D Y Mallikarjunan
- Department of Conservative Dentistry and Endodontics, Vinayaka Mission's Sankarachariyar Dental College, Vinayaka Mission's Research Foundation (Deemed to be University), Salem, Tamil Nadu, India
| | - Thendral Annadurai
- Private Practitioner, Endodontist and Conservative Dentist, Hosur, Tamil Nadu, India
| | - Mothiraj Samynathan
- Department of Orthodontics and Dentofacial Orthopedics, Vinayaka Mission's Sankarachariyar Dental College, Vinayaka Mission's Research Foundation (Deemed to be University), Salem, Tamil Nadu, India
| | - R Jeya Varshini
- Department of Conservative Dentistry and Endodontics, Vinayaka Mission's Sankarachariyar Dental College, Vinayaka Mission's Research Foundation (Deemed to be University), Salem, Tamil Nadu, India
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Bhavikatti SK, Alqahtani NA, Bhat KG, Aggarwal VP, Karobari MI. Evaluation of the anti-inflammatory activity of a Mimusops elengi (linn)-incorporated herbal product: a zymographic analysis. J BIOL REG HOMEOS AG 2020; 34:09. [PMID: 32048499 DOI: 10.23812/19-375-l] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- S K Bhavikatti
- Division of Periodontics and Community Dental Sciences, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - N A Alqahtani
- Division of Periodontics and Community Dental Sciences, College of Dentistry, King Khalid University, Abha, Saudi Arabia
| | - K G Bhat
- Department of Molecular Biology and Immunology, Maratha Mandal's Nathajirao G. Halgekar Institute of Dental Sciences and Research Centre, Belgaum, India
| | - V P Aggarwal
- Department of Public Health Dentistry at Surendra Dental College and Research Institute, Sriganganagar, India
| | - M I Karobari
- Conservative Unit, School of Dental Sciences, Universiti Sains Malaysia Health Campus, Kota Bharu, Malaysia
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Ligi D, Maniscalco R, Mannello F. MMP-2 and MMP-9 in Human Peripheral Blood: Optimizing Gelatinase Calibrator for Degradome Research and Discovering a Novel Gelatinolytic Enzyme. J Proteome Res 2020; 19:525-536. [PMID: 31612719 DOI: 10.1021/acs.jproteome.9b00261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Matrix metalloprotease-2 and -9 (gelatinase A and B, respectively) are enzymes crucially involved in a plethora of physiopathological conditions. Gelatin zymography is considered one of the major qualitative/semiquantitative assays for simultaneously determining zymogenic, active, and complexed forms of gelatinases. Critical steps are represented by variations in sample collection methods, molecular weight standard calibrators, and different zymography assay protocols. A normalization of these aspects is required for reducing discrepancies in technical procedures and interpreting results among different laboratories. In this study, we describe a novel protocol for gelatin zymography with increased pore size, which improves the separation of gelatinases with different molecular weights. A new method for obtaining gelatinase calibrator for gelatin zymography, by extracting MMP-2 and MMP-9 from peripheral blood, is also reported. Our method provides a gelatinase calibrator with enhanced stability both at room temperature and during multiple freeze-thaw cycles. This calibrator preparation is also suitable for in vitro post-translational modifications. For the first time, the improved zymography protocol allowed us to reveal in human peripheral blood samples new gelatinolytic bands resolved at very high molecular weight, likely complexes of MMP-9, undetectable with classical zymography protocols.
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Affiliation(s)
- Daniela Ligi
- Department of Biomolecular Sciences, Section of Clinical Biochemistry and Molecular Genetics , University of Urbino Carlo Bo , via O. Ubaldini 7 , 61029 Urbino , Italy
| | - Rosanna Maniscalco
- Department of Biomolecular Sciences, Section of Clinical Biochemistry and Molecular Genetics , University of Urbino Carlo Bo , via O. Ubaldini 7 , 61029 Urbino , Italy
| | - Ferdinando Mannello
- Department of Biomolecular Sciences, Section of Clinical Biochemistry and Molecular Genetics , University of Urbino Carlo Bo , via O. Ubaldini 7 , 61029 Urbino , Italy
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6
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Wechselberger C, Doppler C, Bernhard D. An Inexpensive Staining Alternative for Gelatin Zymography Gels. Methods Protoc 2019; 2:E61. [PMID: 31344964 DOI: 10.3390/mps2030061] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 07/08/2019] [Accepted: 07/23/2019] [Indexed: 11/22/2022] Open
Abstract
Zymography is a widely used electrophoretic method to determine proteolytic activities in samples from various sources. The method is based on copolymerizing a suitable protein substrate within a sodium dodecyl sulfate-polyacrylamide gel. Following electrophoretic separation of the protease containing samples and a suitable incubation period, degradation of the substrate can be visualized through staining with Coomassie blue. Sites of proteolysis become visible as white bands on a dark blue background. However, this staining protocol requires considerable amounts of ethanol and acetic acid to remove unbound dye molecules. In this report, we describe a new staining protocol using Ponceau S which offers substantial advantages in terms of assay usability and cost reduction, especially when performing large quantities of zymograms or in resource-limited settings. Fast and reproducible staining of zymograms with our protocol is demonstrated, and reliable quantitation of proteolytic activity in comparison to the standard Coomassie staining procedure is shown.
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Abstract
Purpose: The aim of this study was to develop a new type of nanoparticle that enables concentrated drug release and synergistic therapy. Methods: To this end, we synthesized Ge-DOX-5-ALA/NPs, which can enter tumor tissue by the enhanced permeability and retention (EPR) effect and release drugs by utilizing matrix metalloproteinase-2 (MMP-2). Results: The Ge-DOX-5-ALA/NPs were synthesized by a single-phase coacervation method, and the hydrodynamic diameters of all nanoparticles were under 200 nm. The drug encapsulation and loading efficiency were 92%±1.13% and 6.02% ± 0.48%, respectively. Gelatin zymography was performed to detect the expression of MMP-2 in MCF-7 and Hs578Bst cells. The nanoparticle sensitivity to MMP-2 was examined by comparing the release behavior and cellular uptake in MCF-7 and Hs578Bst cells. In vitro cytotoxicity of the nanoparticles was measured by an MTT assay. An in vivo anticancer efficacy study in S180-bearing mice demonstrated that Ge-DOX-5-ALA/NPs provide a substantial curative effect. A pharmacokinetics experiment demonstrated that the nanoparticles have a sustained release effect. Conclusions: The MMP-2-triggered nanoparticles can transport drugs successfully into the tumor site and enable combined chemotherapy and photodynamic therapy.
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Affiliation(s)
- Yue Xu
- a School of Pharmaceutical Sciences , Zhengzhou University , Zhengzhou , China
| | - Jiangnan Zhang
- a School of Pharmaceutical Sciences , Zhengzhou University , Zhengzhou , China
| | - Xinyang Liu
- a School of Pharmaceutical Sciences , Zhengzhou University , Zhengzhou , China
| | - Pengchao Huo
- a School of Pharmaceutical Sciences , Zhengzhou University , Zhengzhou , China
| | - Yan Zhang
- a School of Pharmaceutical Sciences , Zhengzhou University , Zhengzhou , China
| | - Hui Chen
- a School of Pharmaceutical Sciences , Zhengzhou University , Zhengzhou , China
| | - Qingfeng Tian
- b College of Public Health , Zhengzhou University , Zhengzhou , China
| | - Nan Zhang
- a School of Pharmaceutical Sciences , Zhengzhou University , Zhengzhou , China
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Hiebel K, Gentle L, Menino A, Kutzler M. Acupuncture prevents the postpartum reduction in matrix metalloproteinase type-2 immunoexpression, tissue concentration and enzyme activity in bovine caruncles. Reprod Domest Anim 2019; 54:1010-1017. [PMID: 31066470 DOI: 10.1111/rda.13456] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2018] [Accepted: 04/13/2019] [Indexed: 11/27/2022]
Abstract
The objectives of this study were to determine the effects of acupuncture in dairy cows (Bos taurus) on caruncular matrix metalloproteinase type-2 (MMP2) at 0, 2 and 4 hr after calving. Acupuncture (n = 6) was applied at 0 and 2 hr after calving to 6 points that relax the cervix and stimulate uterine contractions. Controls (n = 9) were kept in a stanchion for 15 min without acupuncture. All of the cows in the study delivered their placenta in <4 hr. Formalin-fixed caruncles were paraffin-embedded and subjected to routine immunohistochemistry to determine MMP2 expression, which was scored by a single observer. Flash frozen caruncles were homogenized, and protein concentration was determined. MMP2 concentrations were calculated using commercial bovine ELISAs. MMP2 enzyme activity was determined using zymography. The mean value for each time point for each cow was used to calculate the mean ± SEM for each treatment group. MMP2 was predominantly localized to the epithelial and subepithelial stromal cells of the caruncles in both treatment groups. MMP2 immunoexpression was lower 4 hr after calving in the control cows (p = 0.012) but not in the acupuncture treated cows indicating that acupuncture treatment maintained MMP expression. MMP2 tissue concentration was lower 2 hr after calving in the control cows (p = 0.048) but not in the acupuncture treated cows. MMP2 enzyme activity decreased from 0 to 2 hr after calving in control cows (p = 0.046) but not in acupuncture treated cows. This study provides physiologic evidence for the effects of acupuncture on the bovine reproductive tract and substantiates the use of this treatment in cases of placental retention.
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Affiliation(s)
- Katrina Hiebel
- Department of Integrated Biology, Oregon State University, Corvallis, Oregon
| | - Lauren Gentle
- Department of Integrated Biology, Oregon State University, Corvallis, Oregon
| | - Alfred Menino
- Department of Animal and Rangeland Sciences, Oregon State University, Corvallis, Oregon
| | - Michelle Kutzler
- Department of Animal and Rangeland Sciences, Oregon State University, Corvallis, Oregon
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Abe H, Kajitani N, Okada-Tsuchioka M, Omori W, Yatsumoto M, Takebayashi M. Antidepressant amitriptyline-induced matrix metalloproteinase-9 activation is mediated by Src family tyrosine kinase, which leads to glial cell line-derived neurotrophic factor mRNA expression in rat astroglial cells. Neuropsychopharmacol Rep 2019; 39:156-163. [PMID: 31025529 PMCID: PMC7292280 DOI: 10.1002/npr2.12055] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 02/04/2019] [Accepted: 02/08/2019] [Indexed: 12/25/2022] Open
Abstract
Background Astrocytes have been implicated in the pathophysiology of mood disorders and in the mechanism of the pharmacological effects of antidepressant drugs by the production of neurotrophic/growth factors. Previous studies have identified astrocyte‐expressed Gαi/o‐coupled lysophosphatidic acid receptor 1 (LPAR1), as being involved in antidepressant‐induced production of glial cell line‐derived neurotrophic factor (GDNF) and matrix metalloproteinase‐9 (MMP‐9) activation, an important step in the production of GNDF. However, the precise mechanism of MMP‐9 activation by antidepressants has yet to be identified, in particular the intracellular signaling pathway between LPAR1/Gαi/o and MMP‐9. Methods and Results Treatment of rat C6 astroglial cells (C6 cells) with amitriptyline increased Src family tyrosine kinase phosphorylation in a time and concentration‐dependent manner. Amitriptyline‐induced GDNF mRNA expression was blocked by Src family tyrosine kinase inhibitors. In addition, inhibiting Src family tyrosine kinase blocked amitriptyline‐induced zymographic MMP‐9 activation in C6 cells. The amitriptyline‐induced zymographic MMP‐9 activity was completely blocked by selective inhibition of Gαi/o protein and LPAR1. Furthermore, the amitriptyline‐induced Src family tyrosine kinase phosphorylation was blocked by LPAR1, but not MMP‐9 inhibition, indicating that Src family tyrosine kinase involvement is downstream of LPAR1. Conclusions The current findings suggest that the pharmacological effect of antidepressant such as amitriptyline is mediated through an intracellular signaling pathway via the LPAR1/Gαi/o/Src family tyrosine kinase, which leads to MMP‐9 activation and GDNF production. Treatment of rat C6 astroglial cells (C6 cells) with amitriptyline increased Src family tyrosine kinase phosphorylation in a time‐ and concentration‐dependent manner. The current findings suggest that the pharmacological effect of antidepressant such as amitriptyline is mediated through an intracellular signaling pathway via the LPAR1/Gαi/o/Src family tyrosine kinase, which leads to MMP‐9 activation and glial cell line‐derived neurotrophic factor production.![]()
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Affiliation(s)
- Hiromi Abe
- Division of Psychiatry and Neuroscience, Institute for Clinical Research, National Hospital Organization (NHO) Kure Medical Center and Chugoku Cancer Center, Kure, Japan.,Department of Pharmacy, National Hospital Organization (NHO) Kure Medical Center and Chugoku Cancer Center, Kure, Japan
| | - Naoto Kajitani
- Division of Psychiatry and Neuroscience, Institute for Clinical Research, National Hospital Organization (NHO) Kure Medical Center and Chugoku Cancer Center, Kure, Japan
| | - Mami Okada-Tsuchioka
- Division of Psychiatry and Neuroscience, Institute for Clinical Research, National Hospital Organization (NHO) Kure Medical Center and Chugoku Cancer Center, Kure, Japan
| | - Wataru Omori
- Division of Psychiatry and Neuroscience, Institute for Clinical Research, National Hospital Organization (NHO) Kure Medical Center and Chugoku Cancer Center, Kure, Japan
| | - Masahide Yatsumoto
- Department of Pharmacy, National Hospital Organization (NHO) Kure Medical Center and Chugoku Cancer Center, Kure, Japan
| | - Minoru Takebayashi
- Division of Psychiatry and Neuroscience, Institute for Clinical Research, National Hospital Organization (NHO) Kure Medical Center and Chugoku Cancer Center, Kure, Japan.,Department of Neuropsychiatry, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
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Horváth Á, Botz B, Kiss T, Csekő K, Kiss I, Felinger A, Szabados T, Kenyeres É, Bencsik P, Mócsai A, Ferdinandy P, Helyes Z. Subantimicrobial Dose Doxycycline Worsens Chronic Arthritis-Induced Bone Microarchitectural Alterations in a Mouse Model: Role of Matrix Metalloproteinases? Front Pharmacol 2019; 10:233. [PMID: 30949048 PMCID: PMC6435543 DOI: 10.3389/fphar.2019.00233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Accepted: 02/22/2019] [Indexed: 11/23/2022] Open
Abstract
Background: Rheumatoid arthritis (RA) is a chronic inflammatory joint disease hallmarked by irreversible damage of cartilage and bone. Matrix metalloproteinases (MMPs) involved in connective tissue remodeling play an important role in this process. Numerous MMPs have been examined in humans and animals, but their functions are still not fully understood. Therefore, we investigated the role of MMPs in the K/BxN serum-transfer model of RA with the broad-spectrum MMP inhibitor subantimicrobial dose doxycycline (SDD) using complex in vivo and in vitro methodolgy. Methods: Chronic arthritis was induced by repetitive i.p. injections of K/BxN serum in C57BL/6J mice. SDD was administered daily in acidified drinking water (0.5 mg/mL, 80 mg/kg) during the 30 days experimental period. Mechanonociceptive threshold of the paw was evaluated by aesthesiometry, grasping ability by grid test, arthritis severity by scoring, neutrophil myeloperoxidase activity by luminescence, vascular hyperpermeability and MMP activity by fluorescence in vivo imaging and the latter also by gelatin zymography, bone structure by micro-computed tomography (micro-CT). Plasma concentrations of doxycycline were determined by liquid chromatography-mass spectrometry analysis. Results: K/BxN serum induced significant inflammatory signs, mechanical hyperalgesia, joint function impairment, increased myeloperoxidase activity and vascular hyperpermeability. Significant increase of MMP activity was also observed both in vivo and ex vivo with elevation of the 57–60, 75, and 92 kDa gelatinolytic isoforms in the arthritic ankle joints, but neither MMP activity nor any above described functional parameters were influenced by SDD. Most importantly, SDD significantly reduced bone mineral density in the distal tibia and enhanced the Euler number in the ankle. Arthritis-induced microarchitectural alterations demonstrating increased irregularity and cancellous bone remodeling, such as increased Euler number was significantly elevated by SDD in both regions. Conclusion: We showed increase of various MMP activities in the joints by in vivo fluorescence imaging together with ex vivo zymography, and investigated their functional significance using the broad-spectrum MMP inhibitor SDD in the translational RA model. This is the first demonstration that SDD worsens arthritis-induced bone microarchitectural alterations, but it appears to be independent of MMP inhibition.
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Affiliation(s)
- Ádám Horváth
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary.,Molecular Pharmacology Research Group, Centre for Neuroscience, János Szentágothai Research Centre, University of Pécs, Pécs, Hungary
| | - Bálint Botz
- Molecular Pharmacology Research Group, Centre for Neuroscience, János Szentágothai Research Centre, University of Pécs, Pécs, Hungary.,Department of Radiology, Clinical Centre, University of Pécs, Pécs, Hungary
| | - Tamás Kiss
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary.,Molecular Pharmacology Research Group, Centre for Neuroscience, János Szentágothai Research Centre, University of Pécs, Pécs, Hungary
| | - Kata Csekő
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary.,Molecular Pharmacology Research Group, Centre for Neuroscience, János Szentágothai Research Centre, University of Pécs, Pécs, Hungary
| | - Ibolya Kiss
- Department of Analytical and Environmental Chemistry, Faculty of Sciences, Institute of Chemistry, University of Pécs, Pécs, Hungary.,Environmental Analytical and Geoanalytical Research Group, János Szentágothai Research Centre, University of Pécs, Pécs, Hungary
| | - Attila Felinger
- Department of Analytical and Environmental Chemistry, Faculty of Sciences, Institute of Chemistry, University of Pécs, Pécs, Hungary.,Environmental Analytical and Geoanalytical Research Group, János Szentágothai Research Centre, University of Pécs, Pécs, Hungary
| | - Tamara Szabados
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, Szeged, Hungary
| | - Éva Kenyeres
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, Szeged, Hungary.,Department of Biochemistry, Faculty of Medicine, University of Szeged, Szeged, Hungary.,Pharmahungary Group, Szeged, Hungary
| | - Péter Bencsik
- Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Szeged, Szeged, Hungary.,Department of Biochemistry, Faculty of Medicine, University of Szeged, Szeged, Hungary.,Pharmahungary Group, Szeged, Hungary
| | - Attila Mócsai
- Department of Physiology, Faculty of Medicine, MTA-SE "Lendület" Inflammation Physiology Research Group of the Hungarian Academy of Sciences, Semmelweis University, Budapest, Hungary
| | - Péter Ferdinandy
- Department of Biochemistry, Faculty of Medicine, University of Szeged, Szeged, Hungary.,Pharmahungary Group, Szeged, Hungary.,Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, Semmelweis University, Budapest, Hungary
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary.,Molecular Pharmacology Research Group, Centre for Neuroscience, János Szentágothai Research Centre, University of Pécs, Pécs, Hungary.,Chronic Pain Research Group, National Brain Research Program, Medical School, University of Pécs, Pécs, Hungary.,PharmInVivo Ltd., Pécs, Hungary
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11
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Bui TP, Hoang AN, Le PL, Pham BT, Nguyen LTT, Do HM, Ta TV, Trinh TH. Matrix metalloproteinases in Vietnamese patients with colorectal cancer. Oncol Lett 2017; 13:2097-2104. [PMID: 28454367 PMCID: PMC5403361 DOI: 10.3892/ol.2017.5680] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 11/30/2016] [Indexed: 01/12/2023] Open
Abstract
Matrix metalloproteinases (MMPs), a family of endopeptidases also known as gelatinases, have been reported to affect the acquisition of the cell proliferative, cell invasive and metastatic phenotype of several types of cancer. In particular, the gelatinases MMP-2 and −9 have been revealed to facilitate tumor growth and invasion in patients with colorectal cancer (CRC). However, it is not known whether the gelatinase activity of MMP-2 and −9 is also elevated in Vietnamese patients with CRC. The activity of MMP-2 and −9 in the tissue samples of 103 patients with CRC was evaluated by gelatin zymography and quantified using ImageJ. The association between the level of activity of MMP-2 and −9 and various clinicopathological factors was analyzed, and Chisio BioPAX Editor software was used to visualize the biological pathways regulating the activity of the MMPs. The present study noticed significantly increased activity of active MMP-2 and MMP-9 in tumor tissues (P<0.01), and significantly decreased levels of pro-form MMP-2 and MMP-9 in tumor tissues (P<0.01), compared with that in adjacent tissues in patients with CRC. A correlation between the normalized different activity of MMP-2 and −9 and various clinicopathological features was observed. Furthermore, bioinformatics analysis indicated that the alteration in the activity of MMP-2 and MMP-9 may have been controlled by biological pathways involving the tissue inhibitors of metalloprotease-2 and −1. These findings indicate that the activity of the gelatinases MMP-2 and −9 affects the tumor progression and metastasis of patients with CRC, providing a potential novel approach for determining the prognosis of CRC.
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Affiliation(s)
- Thao Phuong Bui
- Department of Biology and Key Laboratory of Enzyme and Protein Technology, College of Science, Vietnam National University, Hanoi 10000, Vietnam
| | - Anh Ngoc Hoang
- Department of Biology and Key Laboratory of Enzyme and Protein Technology, College of Science, Vietnam National University, Hanoi 10000, Vietnam
| | - Phuong Lan Le
- Department of Biology and Key Laboratory of Enzyme and Protein Technology, College of Science, Vietnam National University, Hanoi 10000, Vietnam
| | - Bich Thi Pham
- Department of Biology and Key Laboratory of Enzyme and Protein Technology, College of Science, Vietnam National University, Hanoi 10000, Vietnam
| | - Linh Thi Tu Nguyen
- Department of Biology and Key Laboratory of Enzyme and Protein Technology, College of Science, Vietnam National University, Hanoi 10000, Vietnam
| | - Ha Minh Do
- Department of Biology and Key Laboratory of Enzyme and Protein Technology, College of Science, Vietnam National University, Hanoi 10000, Vietnam
| | - To Van Ta
- Department of Anatomical Pathology-Cytopathology, Vietnam National Cancer Hospital, Hanoi 10000, Vietnam
| | - Thai Hong Trinh
- Department of Biology and Key Laboratory of Enzyme and Protein Technology, College of Science, Vietnam National University, Hanoi 10000, Vietnam
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Achard V, Sanchez C, Tassistro V, Verdier M, Alessi MC, Grino M. Immediate Postnatal Overfeeding in Rats Programs Aortic Wall Structure Alterations and Metalloproteinases Dysregulation in Adulthood. Am J Hypertens 2016; 29:719-26. [PMID: 26547079 DOI: 10.1093/ajh/hpv183] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Accepted: 10/19/2015] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Alterations in the nutritional perinatal environment, such as intrauterine growth retardation with subsequent postnatal catch-up growth, program cardiovascular disease in adulthood, possibly through alterations in matrix metalloproteinase (MMP)-2 and -9. However, experimental evidences demonstrating that changes in the nutritional perinatal environment can program MMP-2 and -9 with subsequent alterations of vessel wall are lacking. AIM The current study evaluated whether immediate postnatal overfeeding is able to alter vascular morphological indexes and circulating and/or vascular MMP2-2 and -9 status. METHODS Aortic morphology (wall thickness and percentage of incomplete elastin lamellae) and circulating and aortic MMP-2 and -9 activity (measured by gelatin zymography) and aortic MMP-2 and -9 mRNA (measured by reverse transcription polymerase chain reaction (RT-PCR)) were studied in adult male rats overfed (OF) or normofed (NF) during the immediate postnatal period. RESULTS Postnatal overfeeding induced early onset obesity. Adult OF rats presented with increased blood pressure and circulating MMP-2 and -9 activity. In the thoracic aorta, postnatal overfeeding increased wall thickness and decreased elastin integrity (as demonstrated by an increased percentage of incomplete elastin lamellae). OF rats showed enhanced aortic MMP-2 activity and MMP-9 mRNA levels. Circulating and aortic MMP-2 activity correlated positively with the percentage of incomplete elastin lamellae and aortic wall thickness, respectively. CONCLUSION Our data demonstrate for the first time that immediate postnatal nutritional programming induces increases in circulating and aortic MMP-2 activity with parallel aortic wall alterations, such as decreased elastin integrity and enhanced thickening, showing that this experimental model is suitable for the study of perinatal nutritional programming of vascular functions.
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Affiliation(s)
- Vincent Achard
- Inserm, UMR1062, Marseille, France; INRA, UMR 1260, Marseille, France; Aix-Marseille Université, Marseille, France
| | - Caroline Sanchez
- Inserm, UMR1062, Marseille, France; INRA, UMR 1260, Marseille, France; Aix-Marseille Université, Marseille, France
| | - Virginie Tassistro
- Inserm, UMR1062, Marseille, France; INRA, UMR 1260, Marseille, France; Aix-Marseille Université, Marseille, France
| | - Monique Verdier
- Inserm, UMR1062, Marseille, France; INRA, UMR 1260, Marseille, France; Aix-Marseille Université, Marseille, France
| | - Marie-Christine Alessi
- Inserm, UMR1062, Marseille, France; INRA, UMR 1260, Marseille, France; Aix-Marseille Université, Marseille, France
| | - Michel Grino
- Inserm, UMR1062, Marseille, France; INRA, UMR 1260, Marseille, France; Aix-Marseille Université, Marseille, France.
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Xu C, Wang C, Cai QF, Zhang Q, Weng L, Liu GM, Su WJ, Cao MJ. Matrix Metalloproteinase 2 (MMP-2) Plays a Critical Role in the Softening of Common Carp Muscle during Chilled Storage by Degradation of Type I and V Collagens. J Agric Food Chem 2015; 63:10948-10956. [PMID: 26653826 DOI: 10.1021/acs.jafc.5b03893] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Matrix metalloproteinases (MMPs) are proposed to play important roles in the degradation of collagens, thus causing the post-mortem softening of fish muscle, although the specific mechanism remains largely unresolved. Previously, we reported the existence of gelatinase-like proteinases in common carp (Cyprinus carpio) muscle. The primary structures of these proteinases, however, have never been investigated. In the present study, two MMPs with molecular masses of 66 and 65 kDa were purified to homogeneity from common carp muscle by ammonium sulfate fractionation and a series of column chromatographies. Matrix-assisted laser desorption/ionization-tandem time-of-flight mass spectrometry (MALDI-TOF/TOF-MS/MS) analysis indicated that they are completely identical to MMP-2 from common carp. During chilled storage of common carp at 4 °C, the enzymatic activity of MMP-2 increased to 212% in 12 h while the texture profile increased over the first 2 h and gradually decreased. On the other hand, type V collagen was purified to homogeneity and a specific polyclonal antibody against this protein was prepared. Both type I and V collagens were effectively hydrolyzed by MMP-2 at 30 °C and even at 4 °C. Furthermore, injection of metalloproteinase proteinase inhibitor EDTA into the blood vessel of live common carp suppressed post-mortem tenderization significantly. All of these results confirmed that MMP-2 is a major proteinase responsible for the degradation of collagens, resulting in the softening of fish muscle during chilled storage.
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Affiliation(s)
- Chao Xu
- College of Food and Biological Engineering, Jimei University , Xiamen, China 361021
| | - Cheng Wang
- College of Food and Biological Engineering, Jimei University , Xiamen, China 361021
| | - Qiu-Feng Cai
- College of Food and Biological Engineering, Jimei University , Xiamen, China 361021
- Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources , Xiamen, Fujian, China 361102
| | - Qian Zhang
- College of Food and Biological Engineering, Jimei University , Xiamen, China 361021
- Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources , Xiamen, Fujian, China 361102
| | - Ling Weng
- College of Food and Biological Engineering, Jimei University , Xiamen, China 361021
- Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources , Xiamen, Fujian, China 361102
| | - Guang-Ming Liu
- College of Food and Biological Engineering, Jimei University , Xiamen, China 361021
- Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources , Xiamen, Fujian, China 361102
| | - Wen-Jin Su
- College of Food and Biological Engineering, Jimei University , Xiamen, China 361021
- Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources , Xiamen, Fujian, China 361102
| | - Min-Jie Cao
- College of Food and Biological Engineering, Jimei University , Xiamen, China 361021
- Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources , Xiamen, Fujian, China 361102
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Abstract
A fungal alkaline protease of Scopulariopsis spp. was purified to homogeneity with a recovery of 32.2% and 138.1 U/mg specific activity on lectin-agarose column. The apparent molecular mass was 15 ± 1 kD by sodium dodecyl sulfate polyacryalamide gel electrophoresis (SDS-PAGE). It was a homogenous monomeric glycoprotein as shown by a single band and confirmed by native PAGE and gelatin zymography. The enzyme was active and stable over pH range 8.0-12.0 with optimum activity at pH 9.0. The maximum activity was recorded at 50°C and remained unaltered at 50°C for 24 hr. The enzyme was stimulated by Co(2+) and Mn(2+) at 10 mM but was unaffected by Ba(2+), Mg(2+), Cu(2+), Na(+), K(+), and Fe(2+). Ca(2+) and Fe(3+) moderately reduced the activity (∼18%); however, a reduction of about 40% was seen for Zn(2+) and Hg(2+). The enzyme activity was completely inhibited by 5 mM phenylmethylsulfonyl fluoride (PMSF) and partially by N-bromosuccinimide (NBS) and tocylchloride methylketone (TLCK). The serine, tryptophan, and histidine may therefore be at or near the active site of the enzyme. The protease was more active against gelatin compared to casein, fibrinogen, egg albumin, and bovine serum albumin (BSA). With casein as substrate, Km and Vmax were 4.3 mg/mL and 15.9 U/mL, respectively. An activation was observed with sodium dodecyl sulfate (SDS), Tween-80, and Triton X-100 at 2% (v/v); however, H2O2 and NaClO did not affect the protease activity. Storage stability was better for all the temperatures tested (-20, 4, and 28 ± 2°C) with a retention of more than 85% of initial activity after 40 days. The protease retained more than 50% activity after 24 hr of incubation at 28, 60, and 90°C in the presence (0.7%, w/v) of commercial enzymatic and nonenzymatic detergents. The Super Wheel-enzyme solution was able to completely remove blood staining, differing from the detergent solution alone. The stability at alkaline pH and high temperatures, broad substrate specificity, stability in the presence of surfactants and oxidizing and bleaching agents, and excellent compatibility with detergents clearly suggested the use of the enzyme in detergent formulations.
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Sasidharan S, Logeswaran S, Latha LY. Wound healing activity of Elaeis guineensis leaf extract ointment. Int J Mol Sci 2011; 13:336-47. [PMID: 22312255 PMCID: PMC3269689 DOI: 10.3390/ijms13010336] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2011] [Revised: 11/02/2011] [Accepted: 11/28/2011] [Indexed: 11/16/2022] Open
Abstract
Elaeis guineensis of the Arecaceae family is widely used in the traditional medicine of societies in West Africa for treating various ailments. To validate the ethnotherapeutic claims of the plant in skin diseases, wound healing activity was studied. The results showed that E. guineensis leaf extract had potent wound healing capacity as evident from the better wound closure (P < 0.05), improved tissue regeneration at the wound site, and supporting histopathological parameters pertaining to wound healing. Matrix metalloproteinases expression correlated well with the results thus confirming efficacy of E. guineensis in the treatment of the wound. E. guineensis accelerated wound healing in rats, thus supporting its traditional use. The result of this study suggested that, used efficiently, oil palm leaf extract is a renewable resource with wound healing properties.
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Affiliation(s)
- Sreenivasan Sasidharan
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia, 11800 USM, Pulau Pinang, Malaysia; E-Mail:
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +60-46534820; Fax: +60-46534803
| | - Selvarasoo Logeswaran
- Department of Biotechnology, Faculty of Applied Sciences, Asian Institute of Medicine, Science and Technology, 08000 Sungai Petani, Kedah, Malaysia; E-Mail:
| | - Lachimanan Yoga Latha
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia, 11800 USM, Pulau Pinang, Malaysia; E-Mail:
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Waas ET, Lomme RMLM, DeGroot J, Wobbes T, Hendriks T. Tissue levels of active matrix metalloproteinase-2 and -9 in colorectal cancer. Br J Cancer 2002; 86:1876-83. [PMID: 12085179 PMCID: PMC2375422 DOI: 10.1038/sj.bjc.6600366] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2002] [Revised: 04/05/2002] [Accepted: 04/11/2002] [Indexed: 01/02/2023] Open
Abstract
The bioactivity of matrix metalloproteinases was studied in tissues from colorectal cancer patients by means of both quantitative gelatin zymography and a fluorometric activity assay. Next to paired samples of tumour tissue and distant normal mucosa (n=73), transitional tissue was analysed from a limited (n=33) number of patients. Broad-spectrum matrix metalloproteinase activity and both the active and latent forms of the gelatinases matrix metalloproteinase-2 and -9 were higher in tumour than in normal mucosa. The ratio's between active and latent forms of matrix metalloproteinase-2 and -9 were highest in tumour tissue and normal mucosa, respectively. Matrix metalloproteinase-2 levels, both active and latent forms, correlated inversely with stage of disease, the tumours without synchronous distant metastases containing significantly (P=0.005) more active matrix metalloproteinase-2 than the others. At much lower levels of activity, the same trend was observed in distant normal mucosa. The level of latent form of matrix metalloproteinase-9 in tumour depended on tumour location. Neither the active form of matrix metalloproteinase-9 nor broad-spectrum matrix metalloproteinase activity in tumour tissue did correlate with any of the clinicopathological parameters investigated. The results demonstrate explicit differences between the activity of matrix metalloproteinase-2 and -9, indicating different roles for both gelatinases in tumour progression. Such data are necessary in order to develop rational anti-cancer therapies based on inhibition of specific matrix metalloproteinases.
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Affiliation(s)
- E T Waas
- Department of Surgery, University Medical Centre St Radboud, Nijmegen PO Box 9101, 6500 HB, The Netherlands
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Vaillant C, Didier-Bazès M, Hutter A, Belin MF, Thomasset N. Spatiotemporal expression patterns of metalloproteinases and their inhibitors in the postnatal developing rat cerebellum. J Neurosci 1999; 19:4994-5004. [PMID: 10366632 PMCID: PMC6782674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023] Open
Abstract
Matrix metalloproteinases (MMPs) are proteolytic enzymes that degrade the components of the extracellular matrix (ECM). The balance between MMPs and their inhibitors [tissue inhibitors of metalloproteinases (TIMPs)] in the pericellular environment determines the most significant proteolytic events in tissue remodeling. In vitro evidence is accumulating that these molecules may be crucial in the maturation of neural cells. Here, we investigated the in vivo expression of MMPs 2, 3, and 9 and TIMPs 1, 2, and 3 in the developing and adult rat cerebellum using immunohistochemistry and in situ hybridization. During postnatal development, all Purkinje (PK) cell somata expressed all the MMPs and TIMPs studied, whereas their growing dendritic trees expressed only MMP 3 and TIMP 3. In the adult, MMP 3 was confined to PK cell bodies, whereas TIMP 3 was expressed in PK cell somata and processes. Irrespective of the developmental stage, Bergmann glial processes contained only MMP 9, but their somata contained both TIMP 1 and MMP 9. In granular cells, MMPs 3 and 9 and TIMPs 1, 2, and 3 were chiefly detected at a time when migration is known to be maximal; except for that of TIMP 1, their expression persisted in the internal granular layer in the adult. The functional relevance of MMP expression was verified by gelatin zymography. MMP 9 activity was maximal on postnatal day 10 (P10) and was detectable at a low level on P15 and in the adult, whereas MMP 2 activity remained similar throughout postnatal development. Regional and cell-specific expression of MMPs and TIMPs closely reflects the successive stages of cerebellar development, thereby suggesting a pivotal role for ECM proteolysis in brain development and plasticity.
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Affiliation(s)
- C Vaillant
- Institut National de la Santé et de la Recherche Médicale, U433, Faculté de Médecine Laënnec, 69372 Lyon Cedex 08, France
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