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A Novel Stretching Platform for Applications in Cell and Tissue Mechanobiology
Published on: June 3, 2014
Changes in gene expression by trabecular meshwork cells in response to mechanical stretching
Vasavi Vittal1, Anastasia Rose, Kate E Gregory
1Casey Eye Institute, Oregon Health and Science University, Portland, OR 97239-4197, USA.
Investigative Ophthalmology & Visual Science
|July 27, 2005
Summary
Mechanical stretching of trabecular meshwork (TM) cells alters gene expression, impacting extracellular matrix (ECM) regulation. This study reveals key gene changes in TM cells responding to mechanical stress, crucial for intraocular pressure (IOP) homeostasis.
Area of Science:
- Ocular biology
- Cellular mechanotransduction
- Extracellular matrix dynamics
Background:
- Trabecular meshwork (TM) cells regulate aqueous humor outflow resistance.
- TM cells sense intraocular pressure (IOP) via mechanical stretching.
- Mechanical stress induces extracellular matrix (ECM) turnover in TM cells.
Purpose of the Study:
- To investigate changes in TM cell gene expression in response to mechanical stretching.
- To understand the homeostatic adjustment mechanisms of TM cells under mechanical load.
Main Methods:
- Porcine TM cells were subjected to sustained mechanical stretching.
- Gene expression changes were analyzed using microarrays and quantitative reverse transcription-polymerase chain reaction (qRT-PCR).
- Protein level changes were assessed via Western immunoblotting.
Main Results:
- Mechanical stretching significantly altered the expression of 155 genes (126 upregulated, 29 downregulated) in TM cells.
- Notable changes were observed in ECM regulatory genes, cytoskeletal-regulatory genes, signal-transduction genes, and stress-response genes.
- Microarray findings were validated by qRT-PCR, and protein level changes correlated with mRNA alterations.
Conclusions:
- Mechanical stretching significantly impacts the expression of various TM genes, including ECM proteins.
- These gene expression changes, particularly in ECM components, likely play organizational roles within the TM.
- Upregulation or downregulation of specific proteins may contribute to the homeostatic modification of aqueous humor outflow resistance.
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