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Trabecular cell expression of fibronectin and MMP-3 is modulated by aqueous humor growth factors
- Source :
- Experimental eye research. 78(3)
- Publication Year :
- 2004
-
Abstract
- We investigated the mRNA and protein expression of fibronectin and stromelysin-1 (matrix metalloproteinase-3, MMP-3) by trabecular cells treated with growth factors present in primary and secondary aqueous humors. Serum-deprived trabecular cells were incubated for 48 hr or 7 days in medium containing either primary or secondary aqueous humor growth factors or in serum-free medium. We extracted total RNA, performed reverse transcription-polymerase chain reaction using primer pairs for fibronectin, stromelysin-1 and glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and quantified the products. We utilized Western blotting to detect and quantify fibronectin and stromelysin-1 protein. Compared to controls, expression of fibronectin mRNA by trabecular cells was increased by 50 and 100% after incubation in primary aqueous humor growth factors for 48 hr or 7 days, respectively, and 50 and 130% after incubation in secondary aqueous humor growth factors. Stromelysin-1 mRNA expression was decreased by 25 and 50% after incubation in primary aqueous humor growth factors for 48 hr or 7 days, respectively, and 80 and 85% after incubation for 48 hr or 7 days, respectively, in secondary aqueous humor growth factors. Fibronectin protein increased 3.5-fold and 6-fold after incubation for 48 hr with primary or secondary aqueous humor growth factors, respectively; after 7 days, the level increased 4- and 7-folds, respectively. Stromelysin-1 protein was not detectable by western blotting. The up-regulation of fibronectin mRNA by trabecular cells exposed to growth factors present in secondary aqueous humor augmented by the down-regulation of stromelysin-1 mRNA contributed to the accumulation of fibronectin. Our findings open the possibility that induction of stromelysin-1 gene expression in the trabecular meshwork of glaucomatous eyes could effectively reduce buildup of fibronectin in the aqueous outflow pathway to decrease outflow resistance in glaucomatous states of the eye.
- Subjects :
- genetic structures
Swine
Matrix metalloproteinase
Biology
Culture Media, Serum-Free
Aqueous Humor
Cellular and Molecular Neuroscience
Western blot
Trabecular Meshwork
Gene expression
medicine
Animals
RNA, Messenger
Growth Substances
Incubation
Cells, Cultured
Messenger RNA
medicine.diagnostic_test
Reverse Transcriptase Polymerase Chain Reaction
Molecular biology
Sensory Systems
Fibronectins
Fibronectin
Blot
Ophthalmology
medicine.anatomical_structure
Gene Expression Regulation
biology.protein
Matrix Metalloproteinase 3
sense organs
Trabecular meshwork
Subjects
Details
- ISSN :
- 00144835
- Volume :
- 78
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Experimental eye research
- Accession number :
- edsair.doi.dedup.....231bb4ea6e049bf12cfabe56b95ed179