Abstract：
:Gene therapy has been proposed as a feasible strategy for RGC survival and optic nerve regeneration. Some preclinical and clinical studies revealed intraocular inflammation after intravitreal injection of adeno-associated virus (AAV) by slit-lamp or indirect ophthalmoscope. Here we evaluate the longitudinal profile of immediate inflammatory responses after AAV2 injection in rat retina and vitreous body by optical coherence tomography (OCT). Adult Fischer F344 rats were intravitreally injected once with saline, AAV2 or zymosan. Retinal thickness and cell infiltration were recorded by OCT longitudinally for 2 months and verified by histological analysis. The transduction rate of single intravitreal AAV2 injection was 21.3 ± 4.9% of whole retina, and the transduction efficiency on RGCs was 91.5 ± 2.5% in the transduced area. Significant increase in cell infiltration was observed from Day 1-3 after AAV2 injection, compared to very few infiltrating cells observed in the saline-injected group. The infiltrating cells ceased at Day 5 after intravitreal injection and remained absent at 2 months. The thicknesses of total and inner retina were increased along Day 1-3 after AAV2 injection, but reverted to normal afterwards. The surviving RGCs in the AAV2-injected groups at Day 14 showed no significant difference compared to saline-injected group. In summary, this study revealed the immediate inflammatory responses and retinal edema after intravitreal AAV2 injection in normal rats, without influencing long-term retinal thickness and RGC survival. OCT can be implemented for the time-lapse in vivo evaluation of inflammatory response after AAV-mediated gene therapy through intravitreal injection.
journal_name
Exp Eye Resjournal_title
Experimental eye researchauthors
Liu YF,Huang S,Ng TK,Liang JJ,Xu Y,Chen SL,Xu C,Zhang M,Pang CP,Cen LPdoi
10.1016/j.exer.2020.107955subject
Has Abstractpub_date
2020-04-01 00:00:00pages
107955eissn
0014-4835issn
1096-0007pii
S0014-4835(19)30886-3journal_volume
193pub_type
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