Mechanisms of Glaucoma: IL-6, Iron Overload & BMP Pathways

Explore the role of IL-6 signaling, iron overload, and the BMP/JAK-STAT pathways in ocular neurodegeneration and glaucoma beyond elevated IOP.

#glaucoma#neurodegeneration#ophthalmology#il-6#iron-overload#biomedical-science#medical-research

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👁️

🔬 BMP Pathway

⚡ JAK-STAT Pathway

🔴 IL-6 & Iron Overload

🧪 ELISA Experiments

📊 MCP-1 & IP-10

Neuro-Ophthalmology Research

IL-6, Iron Overload & Glaucoma

Unraveling the BMP & JAK-STAT Pathways in Ocular Neurodegeneration

Presented by: [Your Name]

Research Scientist | Neuro-Ophthalmology

[Your Institution / Department]

March 2026

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Slide 2 — Anatomy

Layers of the Eye — From Outer to Inner

🔵 3 Main Tunics: Fibrous (Sclera+Cornea) · Vascular (Uvea) · Neural (Retina)

Layer by Layer — Outer → Inner

Cornea — Transparent outer dome, 2/3 of refraction

Sclera — White fibrous protective shell

Choroid — Vascular layer, nourishes retina

Iris / Ciliary Body — Controls pupil & lens shape

Lens — Fine focus, accommodation

Retina — 10-layer neural tissue, photoreceptors

Optic Nerve — Carries signals to visual cortex

⚠️ Glaucoma Target: Retinal Ganglion Cells (RGCs) in the Ganglion Cell Layer are the primary cells lost in glaucoma

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Slide 3 — Deep Dive

Retinal Layers — The 10 Layers & Glaucoma

The 10 Retinal Layers

1. Inner Limiting Membrane

2. Nerve Fiber Layer

3. Ganglion Cell Layer ★

4. Inner Plexiform Layer

5. Inner Nuclear Layer

6. Outer Plexiform Layer

7. Outer Nuclear Layer

8. Rods & Cones

9. Bruch's Membrane

10. RPE

⚠️ Glaucoma: RGC Loss

In glaucoma, the Ganglion Cell Layer undergoes progressive apoptosis. RGCs are the output neurons of the retina — they form the optic nerve.

Elevated IOP, oxidative stress, and neuroinflammation (IL-6, MCP-1) all converge to drive RGC death.

✅ Key Insight: Protecting the Ganglion Cell Layer = preserving vision in glaucoma patients

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Slide 4 — Signaling

BMP Pathway — Iron Sensing & Hepcidin Regulation

🧶 BMP / SMAD Pathway

Key Steps:

1 Iron ↑ triggers BMP6 release from liver endothelium

2 BMP6 binds HJV + BMPR-I/II on hepatocytes

3 SMAD1/5/8 phosphorylated → complex with SMAD4

4 Nuclear translocation → binds BMP-RE on hepcidin promoter

5 Hepcidin ↑ → Ferroportin degradation → ↓ Iron export

🔗 IL-6 Connection: IL-6 also activates hepcidin via JAK-STAT, creating a dual-hit inflammatory iron dysregulation

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Slide 5 — Signaling

JAK-STAT Pathway — IL-6 Driven Inflammation

⚡ JAK-STAT3 Signaling Cascade

Mechanism Steps:

1 IL-6 binds IL-6Rα receptor

2 Complex recruits gp130 → 2:2:2 hexameric complex

3 JAK1/JAK2/TYK2 auto-phosphorylate

4 STAT3 phosphorylated → dimerizes → nucleus

5 Target gene transcription: hepcidin, inflammation genes

6 Negative feedback: SOCS3 inhibits JAK activity

🔗 In Glaucoma: Chronic IL-6 elevation sustains STAT3 activation → neuroinflammation & RGC apoptosis

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Slide 6 — IL-6 Hub

IL-6: The Master Regulator — BMP, JAK-STAT & Iron

🔴 IL-6 Dual Role

Classic signaling: IL-6 + IL-6Rα → JAK-STAT3 → inflammatory genes

Trans-signaling: Soluble IL-6R (sIL-6R) + gp130 on non-immune cells → broader inflammation

🧶 IL-6 → BMP → Hepcidin

IL-6 independently upregulates hepcidin via STAT3 binding to hepcidin promoter, bypassing the BMP/SMAD route — double amplification of iron trapping

👁️ In Glaucoma

Elevated IL-6 in aqueous humor activates both pathways → ROS from iron → mitochondrial dysfunction → RGC apoptosis

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Slide 7 — Iron Biology

Iron Overload & Hepcidin — The Ferroportin Axis

🥸 Hepcidin Function

Hepcidin is the master iron regulator — it binds ferroportin (the only known iron exporter) and causes its internalization and degradation, trapping iron inside cells

🔴 Two Triggers

1. High iron: BMP6/SMAD → hepcidin (homeostatic)

2. Inflammation: IL-6/JAK-STAT3 → hepcidin (inflammatory anemia)

⚡ Consequence in Glaucoma

Chronic IL-6 elevation → sustained hepcidin → iron accumulates in retinal cells → Fenton reaction → hydroxyl radicals → ROS → RGC death

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Slide 8 — Experiment

ELISA Protocol — Measuring IL-6 in Glaucoma

🧪 Sample Collection

Aqueous humor aspirated (100–200 µL) during cataract surgery or paracentesis from POAG patients vs. cataract controls

📊 Expected Findings

• IL-6: Elevated in POAG vs. controls (p<0.05)

• sIL-6R: ~118 pg/mL (POAG) vs ~68 pg/mL (control)

• Correlates with IOP and visual field loss

✅ ELISA Kit

Human IL-6 ELISA kit (Sandwich), sensitivity ~1 pg/mL, run in duplicates, absorbance at 450 nm. Include standard curve 0–500 pg/mL.

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Slide 9 — Cytokine Profiling

MCP-1 & IP-10 — Inflammatory Mediators in Glaucoma

🔵 MCP-1 (CCL2)

• Monocyte chemoattractant — recruits monocytes & macrophages

• Elevated in glaucoma aqueous humor

• Drives microglial activation → RGC neuroinflammation

🟢 IP-10 (CXCL10)

• IFN-γ induced — recruits CXCR3+ T cells

• Promotes neuroinflammation at optic nerve head

• Synergizes with IL-6 to amplify STAT3 signaling

🧪 Planned ELISA

Multiplex ELISA (Luminex) measuring IL-6, MCP-1 (CCL2), IP-10 (CXCL10) simultaneously in aqueous humor from 3 groups: Normal · POAG · NTG

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Slide 10 — Conclusion

Summary & Therapeutic Implications

Key Takeaways

1️⃣

IL-6 is elevated in glaucoma aqueous humor and drives both JAK-STAT3 neuroinflammation and BMP/SMAD hepcidin upregulation

2️⃣

Hepcidin ↑ → Ferroportin ↓ → Cellular iron overload → ROS generation → RGC apoptosis

3️⃣

MCP-1 and IP-10 amplify neuroinflammation, recruiting monocytes and T-cells to the optic nerve head

4️⃣

ELISA of aqueous humor can quantify IL-6, MCP-1, IP-10 as biomarkers for glaucoma severity and treatment response

🎯

Therapeutic Target: Anti-IL-6 (tocilizumab) or JAK inhibitors may represent a novel neuroprotective strategy in glaucoma

IL-6 / Iron Overload / Glaucoma Research

March 2026

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IL-6, Iron Overload & Glaucoma

Layers of the Eye — From Outer to Inner

Retinal Layers — The 10 Layers & Glaucoma

BMP Pathway — Iron Sensing & Hepcidin Regulation

JAK-STAT Pathway — IL-6 Driven Inflammation

IL-6: The Master Regulator — BMP, JAK-STAT & Iron

Iron Overload & Hepcidin — The Ferroportin Axis

ELISA Protocol — Measuring IL-6 in Glaucoma

MCP-1 & IP-10 — Inflammatory Mediators in Glaucoma

Summary & Therapeutic Implications

DESIGNER-MADE PRESENTATION, GENERATED FROM YOUR PROMPT

Mechanisms of Glaucoma: IL-6, Iron Overload & BMP Pathways

DESIGNER-MADE
PRESENTATION,
GENERATED FROM
YOUR PROMPT