Publications -- Abe Clark
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12503/31655
This collection is limited to articles published under the terms of a creative commons license or other open access publishing agreement since 2016. It is not intended as a complete list of the author's works.
Browse
Browsing Publications -- Abe Clark by Subject "Adenoviridae / genetics"
Now showing 1 - 2 of 2
- Results Per Page
- Sort Options
Item BMP and Activin Membrane Bound Inhibitor Regulates the Extracellular Matrix in the Trabecular Meshwork(ARVO Journals, 2018-04) Hernandez, Humberto; Millar, J. Cameron; Curry, Stacy M.; Clark, Abbot F.; McDowell, Colleen M.Purpose: The trabecular meshwork (TM) has an important role in the regulation of aqueous humor outflow and IOP. Regulation of the extracellular matrix (ECM) by TGFbeta2 has been studied extensively. Bone morphogenetic protein (BMP) and activin membrane-bound inhibitor (BAMBI) has been shown to inhibit or modulate TGFbeta2 signaling. We investigate the role of TGFbeta2 and BAMBI in the regulation of TM ECM and ocular hypertension. Methods: Mouse TM (MTM) cells were isolated from B6;129S1-Bambitm1Jian/J flox mice, characterized for TGFbeta2 and dexamethasone (DEX)-induced expression of fibronectin, collagen-1, collagen-4, laminin, alpha-smooth muscle actin, cross-linked actin networks (CLANs) formation, and DEX-induced myocilin (MYOC) expression. MTM cells were transduced with Ad5.GFP to identify transduction efficiency. MTM cells and mouse eyes were transduced with Ad5.Null, Ad5.Cre, Ad5.TGFbeta2, or Ad5.TGFbeta2 + Ad5.Cre to evaluate the effect on ECM production, IOP, and outflow facility. Results: MTM cells express TM markers and respond to DEX and TGFbeta2. Ad5.GFP at 100 MOI had the highest transduction efficiency. Bambi knockdown by Ad5.Cre and Ad5.TGFbeta2 increased fibronectin, collagen-1, and collagen-4 in TM cells in culture and tissue. Ad5.Cre, Ad5.TGFbeta2, and Ad5.TGFbeta2 + Ad5.Cre each significantly induced ocular hypertension and lowered aqueous humor outflow facility in transduced eyes. Conclusions: We show for the first time to our knowledge that knockdown of Bambi alters ECM expression in cultured cells and mouse TM, reduces outflow facility, and causes ocular hypertension. These data provide a novel insight into the development of glaucomatous TM damage and identify BAMBI as an important regulator of TM ECM and ocular hypertension.Item ID1 and ID3 are Negative Regulators of TGFbeta2-Induced Ocular Hypertension and Compromised Aqueous Humor Outflow Facility in Mice(ARVO Journals, 2021-05-03) Mody, Avani A.; Millar, J. Cameron; Clark, Abbot F.Purpose: In POAG, elevated IOP remains the major risk factor in irreversible vision loss. Increased TGFbeta2 expression in POAG aqueous humor and in the trabecular meshwork (TM) amplifies extracellular matrix (ECM) deposition and reduces ECM turnover in the TM, leading to a decreased aqueous humor (AH) outflow facility and increased IOP. Inhibitor of DNA binding proteins (ID1 and ID3) inhibit TGFbeta2-induced fibronectin and PAI-1 production in TM cells. We examined the effects of ID1 and ID3 gene expression on TGFbeta2-induced ocular hypertension and decreased AH outflow facility in living mouse eyes. Methods: IOP and AH outflow facility changes were determined using a mouse model of Ad5-hTGFbeta2C226S/C288S-induced ocular hypertension. The physiological function of ID1 and ID3 genes were evaluated using Ad5 viral vectors to enhance or knockdown ID1/ID3 gene expression in the TM of BALB/cJ mice. IOP was measured in conscious mice using a Tonolab impact tonometer. AH outflow facilities were determined by constant flow infusion in live mice. Results: Over-expressing ID1 and ID3 significantly blocked TGFbeta2-induced ocular hypertension (P < 0.0001). Although AH outflow facility was significantly decreased in TGFbeta2-transduced eyes (P < 0.04), normal outflow facility was preserved in eyes injected concurrently with ID1 or ID3 along with TGFbeta2. Knockdown of ID1 or ID3 expression exacerbated TGFbeta2-induced ocular hypertension. Conclusions: Increased expression of ID1 and ID3 suppressed both TGFbeta2-elevated IOP and decreased AH outflow facility. ID1 and/or ID3 proteins thus may show promise as future candidates as IOP-lowering targets in POAG.