advertisement
Abstract #26444 Published in IGR 12-3
Differential susceptibility to experimental glaucoma among 3 mouse strains using bead and viscoelastic injection
Cone FE; Gelman SE; Son JL; Pease ME; Quigley HAExperimental Eye Research 2010; 91: 415-424
The purpose of this experiment was to test the susceptibility to retinal ganglion cell (RGC) axon loss and RGC layer cell loss from experimental glaucoma among 3 mouse strains, and between younger and older mice. We obstructed the mouse aqueous outflow channels by injecting 2 (mu)L of 6 (mu)m diameter, polystyrene beads followed by 3 (mu)L of viscoelastic solution into the anterior chamber with a glass micropipette. We evaluated intraocular pressure (IOP) and damage to RGC as measured by optic nerve axon counts and RGC layer neuron counts in 3 strains of young mice (2 month old C57BL/6, DBA/2J, and CD1) and 10 month C57BL/6 mice. Bead and viscoelastic injection produced IOP elevation at (greater-than or equal to)1 time point in 94.1% of eyes (112/119), with mean IOP difference from fellow eyes of 4.4 (plus or minus) 3.0 mmHg. By 6-12 weeks, injected eyes were 10.8% longer and 7.6% wider (p < 0.0001). Young DBA/2J and C57BL/6 eyes increased axial length significantly more than young CD1 or older C57BL/6 (all p (less-than or equal to) 0.02). RGC layer and axon loss was greatest in CD1 mice, significantly more than the other groups (p from 0.04 to <0.0001). Young C57BL/6 eyes elongated more and lost more RGC layer cells than older C57BL/6 mice (p = 0.02 and 0.01, respectively). With this mouse glaucoma model, there was differential susceptibility to ocular elongation and RGC layer and axon damage among mouse strains and by age. Factors that determine sensitivity to RGC injury can be studied using transgenic mouse strains with inducible models.
H.A. Quigley. Glaucoma Research Laboratory, Johns Hopkins University School of Medicine, Wilmer Institute, Wilmer 122, 600 North Wolfe Street, Baltimore, MD 21287, United States. hquigley@jhmi.edu
Classification:
5.1 Rodent (Part of: 5 Experimental glaucoma; animal models)
