Reduced Plasma BDNF Levels in Normal Tension Glaucoma Compared to Open Angle Glaucoma

Area of Science:

• Ophthalmology
• Neuroscience
• Biochemistry

Background:

• Glaucoma is a leading cause of irreversible blindness.
• Primary open-angle glaucoma (POAG) and normal tension glaucoma (NTG) are distinct subtypes.
• The role of systemic factors like brain-derived neurotrophic factor (BDNF) in glaucoma pathogenesis is under investigation.

Purpose of the Study:

• To compare systemic BDNF levels between NTG and POAG patients.
• To investigate the relationship between BDNF and glaucoma subtypes.
• To explore potential IOP-independent mechanisms in glaucoma.

Main Methods:

• Blood samples were collected from 260 NTG patients, 220 POAG patients, and 120 cataract controls.
• Systemic BDNF levels were quantified using an antibody-conjugated bead assay (Luminex).
• Statistical analysis was performed to compare BDNF levels across groups.

Main Results:

• Plasma BDNF levels were significantly lower in the NTG group compared to both POAG and control groups.
• No significant difference in BDNF levels was observed between the POAG and control groups.
• These findings indicate a specific association between reduced systemic BDNF and NTG.

Conclusions:

• Low systemic BDNF levels may be implicated in the pathogenesis of NTG.
• The contribution of BDNF to glaucoma may be independent of intraocular pressure.
• Further research is warranted to elucidate the precise mechanisms linking BDNF to glaucoma.