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Differential Survival of Retinal Ganglion Cell Types Following Branch Retinal Vein Occlusion

Saman Behboodi TanourloueeiD, Chao ReniD, Andrea C. SantefordiD, Sean McCrackeniD, Minglei ZhaoiD, Chengzhi ZhaoiD, Rajendra S. ApteiD, Chao ZhouiD, Philip Raymond WilliamsiD

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Abstract

Background. Branch retinal vein occlusion (BRVO) is a common cause of retinal ischemia, rapidly inducing neuronal death and often producing irreversible vison loss. Interventions such as thrombolysis restore perfusion but cannot recover neurons already lost, and most patients retain permanent visual deficits. Identifying which neuronal populations die, and how rapidly, may therefore reveal timing windows and targets for neuroprotective treatment. Aims. To determine the timing of pathology, we evaluated vascular changes and neuronal degeneration in a photocoagulation-induced mouse model of BRVO. To determine differences in retinal ganglion cells (RGC) type susceptibility, we tracked the survival of RGC subpopulations using immunofluorescence markers. Methods. BRVO was induced by retro-orbital injection of Rose Bengal and FITC dextran followed by targeted photocoagulation of a branch vein. Obstruction was confirmed by fluorescein angiography and vascular damage was viewed by optical coherence tomography angiography. Cell survival was quantified by immunostaining at 3, 7, and 14 days using RNA Binding Protein with Multiple Splicing (RBPMS, pan RGC). RGC subtype markers for intrinsically photosensitive RGCs (TBR2), RGCs (SPP1), ON OFF direction-selective RGCs (CART), and F RGCs (FOXP2) were used to examine differences in survival across RGC types. Results. Occlusion selectively disrupted the superficial and intermediate capillary plexus, sparing the deep plexuses. All examined neuronal populations were significantly depleted, but with markedly different magnitude and timing. RGCs and F RGCs were the most vulnerable subtypes, both approaching complete loss by one week, whereas intrinsically photosensitive RGCs were the most resistant. Conclusion. RGCs, typically resilient in glaucoma, trauma, and excitotoxicity, were markedly vulnerable in BRVO, indicating that RGC subtype susceptibility is insult-specific.

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In-depth summary

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Claude Sonnet 4.6 · xhigh effort · 8 Nov 2026 · from the full text of version 2 (1 Nov 2026) · CC BY 4.0

In a mouse branch retinal vein occlusion model, retinal ganglion cells die progressively over 14 days. α-RGCs and F-RGCs are lost fastest, and TBR2-positive intrinsically photosensitive RGCs survive best.

The paper says little is known about how individual neuronal subtypes in the inner retina survive venous-occlusive hypoxia, and that clinical timing in BRVO is based on vascular and edema endpoints, not neuronal loss. It tracks pan-RGC and four subtype markers at 3, 7 and 14 days, and finds α-RGCs, described as resilient in other degeneration models, to be highly vulnerable here.

Key results

  1. ShownPan-RGC (RBPMS-positive) loss in the occluded region grew steadily over two weeks, and a light-only sham did not reduce RGC density.

    Cumulative loss 32.0% ± 12.1% at 3 days post occlusion (DPO), 60.3% ± 16.5% at 7 DPO, 82.6% ± 5.8% at 14 DPO (n = 13, 13, 11 eyes). Sham 4295.4 ± 219.4 vs untreated 4491.4 ± 242.4 cells/mm^2, p = 0.363. · 3.2 RGCs die continuously over two weeks after…; Figure legends

  2. ShownSPP1+ α-RGCs, FOXP2+ F-RGCs and CART+ direction-selective RGCs lost more than all RGCs at 3 and 7 DPO. At 14 DPO SPP1 and FOXP2 cells were more depleted (93.4%, 91.6% vs 82.6%), CART similar (79.8%). α-RGCs and CART fell fastest early; F-RGCs fell sharply from 3 to 7 DPO.

    Loss at 3/7/14 DPO: SPP1 73.7%/78.3%/93.4%; FOXP2 55.9%/83.6%/91.6%; CART 79.2%/83.2%/79.8%. Subtype n per timepoint was 4 to 7 eyes. · 3.3 αRGCs, F-RGCs and OODSGCs, die rapidly and…; Figure legends

  3. ShownTBR2-positive intrinsically photosensitive RGCs were the most resistant subtype, though they still lost about half their numbers by 14 DPO.

    Loss 16.8% ± 4.4% at 3 DPO, 41.7% ± 12.7% at 7 DPO, 52.3% ± 12.8% at 14 DPO, vs 82.6% ± 5.8% for all RGCs (p = 0.005) and vs SPP1 (p = 0.001), FOXP2 (p = 0.001), CART (p = 0.008) at 14 DPO. · 3.4 ipRGCs are resilient to BRVO; Figure legends

  4. SuggestedPhotocoagulation occluded the targeted vein and destroyed capillaries in the superficial and intermediate plexuses. OCTA showed perfusion loss at 2 DPO, whereas CD31 histology showed capillary destruction only from 7 DPO.

    At 2 DPO, perfusion density fell by almost 40% and vascular fraction by 10% in occluded regions (p = 0.021, p = 0.0035, n = 3). CD31 staining showed no obvious change at 3 DPO, marked destruction at 7 DPO and reduced density at 14 DPO. · 3.1 Local capillary destruction and inflammatory…; Discussion

  5. SuggestedMicroglia accumulated in the occluded region from 3 DPO, peaked at 7 DPO, largely resolved by 14 DPO; SPP1 was strong at 3 DPO and appeared to decrease later. Non-occluded regions were unchanged. Retinal thickness did not change significantly, which the authors read as death mostly limited to RGCs.

    Microglia (Cx3cr1-GFP) were increased at 3 DPO, maximal at 7 DPO, substantially resolved at 14 DPO. Thickness comparisons across 3, 7 and 14 DPO were not significant (n = 3 per timepoint). Microglial findings were qualitative. · 3.1 Local capillary destruction and inflammatory…; 3.2 RGCs die continuously over two weeks after…; Discussion

Methods, data and reproducibility

Branch vein occlusion was induced in mice by photothrombosis with Rose Bengal and verified by fluorescein angiography and OCTA. RGC survival was quantified in retinal whole-mounts as the ratio of marker-positive cell density in occluded vs non-occluded regions, using Cellpose segmentation of RBPMS cells.

  • BRVO and sham retinas, whole-mount immunostaining at 3, 7 and 14 DPO for RBPMS and subtype markers (SPP1, CART, TBR2, FOXP2) · mouse (C57BL/6J, both sexes, 8-12 weeks) · n = RBPMS: 13, 13, 11 eyes at 3, 7, 14 DPO; subtypes 3 to 7 eyes per timepoint
  • In vivo fluorescein angiography and OCTA at baseline and 2 DPO · mouse · n = n = 3 per group
  • Microglia and SPP1 imaging in Cx3cr1-GFP retinas, and CD31 vascular staining · mouse (Cx3cr1-GFP)
Methods & tools
Rose Bengal photothrombosis, fluorescein angiography (Micron III), custom SD-OCT / OCTA, Zeiss LSM 710 confocal, Cellpose (cpdino model), Fiji, Zeiss ZEN Blue, RBPMS, TBR2, SPP1, CART, FOXP2 and CD31 immunostaining, Cx3cr1-GFP mice
Reproducibility gaps
Analysis scripts are said to be available, but the text gives only a '[GitHub repository]' placeholder with no URL. No data deposition is described, and the primary antibody list is missing from the methods.
Limitations (5)
  • Retinal thickness measurements were not statistically significant, which the authors attribute to the experiments being underpowered for these low-resolution measurements. · stated by the authors
  • In vivo angiography and perfusion were measured only at 2 DPO, so longer-term perfusion changes are unknown. OCTA and histology disagreed on early capillary loss. · stated by the authors
  • The authors raise off-target Rose Bengal activation in capillaries as a possible contributor to vascular destruction, but argue against it because they saw no widespread damage. The mechanism of α-RGC vulnerability is not established; HIF-1a and energetic explanations are only suggested. · stated by the authors
  • Subtype group sizes are small (3 to 7 eyes), and OCTA used n = 3, so effect sizes and p-values are imprecise. Large reported loss values rest on few animals. · noted in this summary
  • Each subtype is defined by a single immunomarker. Loss of marker-positive cells is read as cell death, with no test of marker downregulation or of overlap between marker populations. · noted in this summary

Who should read:Read this if you study retinal ischemia or RGC subtype vulnerability and want mouse BRVO survival kinetics for α-RGC, F-RGC, direction-selective and ipRGC populations.

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