TGF-β2-induced invadosomes in human trabecular meshwork cells. 2013

Hong Han, and Daniel Kampik, and Franz Grehn, and Günther Schlunck
Department of Ophthalmology, Würzburg University Hospital, Würzburg, Germany.

Primary open-angle glaucoma (POAG) is a leading cause of blindness due to chronic degeneration of retinal ganglion cells and their optic nerve axons. It is associated with disturbed regulation of intraocular pressure, elevated intraocular levels of TGF-β2, aberrant extracellular matrix (ECM) deposition and increased outflow resistance in the trabecular meshwork (TM). The mechanisms underlying these changes are not fully understood. Cell-matrix interactions have a decisive role in TM maintenance and it has been suggested that TGF-β-induced inhibition of matrix metalloproteases may drive aberrant ECM deposition in POAG. Invadopodia and podosomes (invadosomes) are distinct sites of cell-matrix interaction and localized matrix-metalloprotease (MMP) activity. Here, we report on the effects of TGF-β2 on invadosomes in human trabecular meshwork cells. Human TM (HTM) cells were derived from donor tissue and pretreated with vehicle or TGF-β2 (2 ng/ml) for 3d. Invadosomes were studied in ECM degradation assays, protein expression and MMP-2 activity were assessed by western blot and zymography and ECM protein transcription was detected by RT-qPCR. HTM cells spontaneously formed podosomes and invadopodia as detected by colocalization of Grb2 or Nck1 to sites of gelatinolysis. Pretreatment with TGF-β2 enhanced invadosomal proteolysis and zymographic MMP-2 activity as well as MMP-2, TIMP-2 and PAI-1 levels in HTM cell culture supernatants. Rho-kinase inhibition by H1152 blocked the effects of TGF-β2. Concomitant transcription of fibronectin and collagens-1, -4 and -6 was increased by TGF-β2 and fibrillar fibronectin deposits were observed in areas of invadosomal ECM remodelling. In contrast to a current hypothesis, our data indicate that TGF-β2 induces an active ECM remodelling process in TM cells, characterized by concurrent increases in localized ECM digestion and ECM expression, rather than a mere buildup of material due to a lack of degradation. Invadosomal cell adhesion and signaling may thus have a role in POAG pathophysiology.

UI MeSH Term Description Entries
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D005109 Extracellular Matrix A meshwork-like substance found within the extracellular space and in association with the basement membrane of the cell surface. It promotes cellular proliferation and provides a supporting structure to which cells or cell lysates in culture dishes adhere. Matrix, Extracellular,Extracellular Matrices,Matrices, Extracellular
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000369 Aged, 80 and over Persons 80 years of age and older. Oldest Old
D014129 Trabecular Meshwork A porelike structure surrounding the entire circumference of the anterior chamber through which aqueous humor circulates to the SCHLEMM'S CANAL. Meshwork, Trabecular,Meshworks, Trabecular,Trabecular Meshworks
D015153 Blotting, Western Identification of proteins or peptides that have been electrophoretically separated by blot transferring from the electrophoresis gel to strips of nitrocellulose paper, followed by labeling with antibody probes. Immunoblotting, Western,Western Blotting,Western Immunoblotting,Blot, Western,Immunoblot, Western,Western Blot,Western Immunoblot,Blots, Western,Blottings, Western,Immunoblots, Western,Immunoblottings, Western,Western Blots,Western Blottings,Western Immunoblots,Western Immunoblottings
D016326 Extracellular Matrix Proteins Macromolecular organic compounds that contain carbon, hydrogen, oxygen, nitrogen, and usually, sulfur. These macromolecules (proteins) form an intricate meshwork in which cells are embedded to construct tissues. Variations in the relative types of macromolecules and their organization determine the type of extracellular matrix, each adapted to the functional requirements of the tissue. The two main classes of macromolecules that form the extracellular matrix are: glycosaminoglycans, usually linked to proteins (proteoglycans), and fibrous proteins (e.g., COLLAGEN; ELASTIN; FIBRONECTINS; and LAMININ). Extracellular Matrix Protein,Matrix Protein, Extracellular,Matrix Proteins, Extracellular,Protein, Extracellular Matrix,Proteins, Extracellular Matrix
D017395 Plasminogen Activator Inhibitor 1 A member of the serpin family of proteins. It inhibits both the tissue-type and urokinase-type plasminogen activators. PAI-1,SERPINE1 Protein,Serpin E1,Type 1 Plasminogen Activator Inhibitor,E1, Serpin,Protein, SERPINE1

Related Publications

Hong Han, and Daniel Kampik, and Franz Grehn, and Günther Schlunck
May 2017, Experimental eye research,
Hong Han, and Daniel Kampik, and Franz Grehn, and Günther Schlunck
August 2019, Investigative ophthalmology & visual science,
Hong Han, and Daniel Kampik, and Franz Grehn, and Günther Schlunck
July 2021, Scientific reports,
Hong Han, and Daniel Kampik, and Franz Grehn, and Günther Schlunck
November 2023, Translational vision science & technology,
Hong Han, and Daniel Kampik, and Franz Grehn, and Günther Schlunck
June 2022, Scientific reports,
Hong Han, and Daniel Kampik, and Franz Grehn, and Günther Schlunck
October 2013, Investigative ophthalmology & visual science,
Hong Han, and Daniel Kampik, and Franz Grehn, and Günther Schlunck
July 2020, Biochemical and biophysical research communications,
Hong Han, and Daniel Kampik, and Franz Grehn, and Günther Schlunck
May 2024, International ophthalmology,
Hong Han, and Daniel Kampik, and Franz Grehn, and Günther Schlunck
September 2013, Current eye research,
Hong Han, and Daniel Kampik, and Franz Grehn, and Günther Schlunck
May 2016, Experimental eye research,
Copied contents to your clipboard!