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Physiologic Consequences of Caveolin-1 Ablation in Conventional Outflow Endothelia.

Publication ,  Journal Article
De Ieso, ML; Gurley, JM; McClellan, ME; Gu, X; Navarro, I; Li, G; Gomez-Caraballo, M; Enyong, E; Stamer, WD; Elliott, MH
Published in: Invest Ophthalmol Vis Sci
September 1, 2020

PURPOSE: Polymorphisms at the caveolin-1/2 locus are associated with glaucoma and IOP risk and deletion of caveolin-1 (Cav1) in mice elevates IOP and reduces outflow facility. However, the specific location/cell type responsible for Cav1-dependent regulation of IOP is unclear. We hypothesized that endothelial Cav1 in the conventional outflow (CO) pathway regulate IOP via endothelial nitric oxide synthase (eNOS) signaling. METHODS: We created a mouse with targeted deletion of Cav1 in endothelial cells (Cav1ΔEC) and evaluated IOP, outflow facility, outflow pathway distal vascular morphology, eNOS phosphorylation, and tyrosine nitration of iridocorneal angle tissues by Western blotting. RESULTS: Endothelial deletion of Cav1 resulted in significantly elevated IOP versus wild-type mice but not a concomitant decrease in outflow facility. Endothelial Cav1 deficiency did not alter the trabecular meshwork or Schlemm's canal morphology, suggesting that the effects observed were not due to developmental deformities. Endothelial Cav1 deletion resulted in eNOS hyperactivity, modestly increased protein nitration, and significant enlargement of the drainage vessels distal to Schlemm's canal. L-Nitro-arginine methyl ester treatment reduced outflow in Cav1ΔEC but not wild-type mice and had no effect on the size of drainage vessels. Endothelin-1 treatment decrease the outflow and drainage vessel size in both wild-type and Cav1ΔEC mice. CONCLUSIONS: Our results suggest that hyperactive eNOS signaling in the CO pathway of both Cav1ΔEC and global Cav1 knockout mice results in chronic dilation of distal CO vessels and protein nitration, but that Cav1 expression in the trabecular meshwork is sufficient to rescue CO defects reported in global Cav1 knockout mice.

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Published In

Invest Ophthalmol Vis Sci

DOI

EISSN

1552-5783

Publication Date

September 1, 2020

Volume

61

Issue

11

Start / End Page

32

Location

United States

Related Subject Headings

  • Signal Transduction
  • Polymorphism, Genetic
  • Ophthalmology & Optometry
  • Mice, Knockout
  • Mice, Inbred C57BL
  • Mice
  • Intraocular Pressure
  • Glaucoma
  • Endothelial Cells
  • Disease Models, Animal
 

Citation

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ICMJE
MLA
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De Ieso, M. L., Gurley, J. M., McClellan, M. E., Gu, X., Navarro, I., Li, G., … Elliott, M. H. (2020). Physiologic Consequences of Caveolin-1 Ablation in Conventional Outflow Endothelia. Invest Ophthalmol Vis Sci, 61(11), 32. https://doi.org/10.1167/iovs.61.11.32
De Ieso, Michael L., Jami M. Gurley, Mark E. McClellan, Xiaowu Gu, Iris Navarro, Guorong Li, Maria Gomez-Caraballo, Eric Enyong, W Daniel Stamer, and Michael H. Elliott. “Physiologic Consequences of Caveolin-1 Ablation in Conventional Outflow Endothelia.Invest Ophthalmol Vis Sci 61, no. 11 (September 1, 2020): 32. https://doi.org/10.1167/iovs.61.11.32.
De Ieso ML, Gurley JM, McClellan ME, Gu X, Navarro I, Li G, et al. Physiologic Consequences of Caveolin-1 Ablation in Conventional Outflow Endothelia. Invest Ophthalmol Vis Sci. 2020 Sep 1;61(11):32.
De Ieso, Michael L., et al. “Physiologic Consequences of Caveolin-1 Ablation in Conventional Outflow Endothelia.Invest Ophthalmol Vis Sci, vol. 61, no. 11, Sept. 2020, p. 32. Pubmed, doi:10.1167/iovs.61.11.32.
De Ieso ML, Gurley JM, McClellan ME, Gu X, Navarro I, Li G, Gomez-Caraballo M, Enyong E, Stamer WD, Elliott MH. Physiologic Consequences of Caveolin-1 Ablation in Conventional Outflow Endothelia. Invest Ophthalmol Vis Sci. 2020 Sep 1;61(11):32.

Published In

Invest Ophthalmol Vis Sci

DOI

EISSN

1552-5783

Publication Date

September 1, 2020

Volume

61

Issue

11

Start / End Page

32

Location

United States

Related Subject Headings

  • Signal Transduction
  • Polymorphism, Genetic
  • Ophthalmology & Optometry
  • Mice, Knockout
  • Mice, Inbred C57BL
  • Mice
  • Intraocular Pressure
  • Glaucoma
  • Endothelial Cells
  • Disease Models, Animal