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Updated: Feb 20, 2026

Real-time Imaging of Axonal Transport of Quantum Dot-labeled BDNF in Primary Neurons
Published on: September 15, 2014
Relationship between Sigma-1 receptor and BDNF in the visual system.
Barbara A Mysona1, Jing Zhao1, Sylvia Smith1
1James and Jean Culver Vision Discovery Institute, Augusta, GA, 30912, United States; Department of Ophthalmology, Medical College of Georgia, Augusta University, Augusta, GA, 30912, United States; Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, Augusta, GA, 30912, United States.
Activating the sigma-1 receptor (S1R) boosts brain-derived neurotrophic factor (BDNF) in the retina and optic nerve head, potentially aiding glaucoma treatment.
Area of Science:
- Neuroscience
- Ophthalmology
- Cell Biology
Background:
- Glaucoma is an incurable optic neuropathy causing retinal ganglion cell (RGC) death.
- Brain-derived neurotrophic factor (BDNF) is crucial for RGC survival.
- Mechanisms regulating BDNF in the visual system are not fully understood.
Purpose of the Study:
- To investigate the role of the sigma-1 receptor (S1R) in modulating BDNF expression and secretion in the retina and optic nerve head (ONH).
- To determine if S1R activation or deletion affects levels of mature BDNF (mBDNF) and proBDNF.
Main Methods:
- In vivo administration of S1R agonist (+)-pentazocine (PTZ) to mice and examination of retinal and hippocampal BDNF levels.
- Analysis of BDNF expression in S1R knockout mice.
- In vitro treatment of cultured ONH astrocytes with PTZ to assess BDNF secretion.
Main Results:
- (+)-PTZ treatment increased mBDNF protein in the retina and hippocampus.
- S1R deletion led to deficits in retinal mBDNF.
- In cultured ONH astrocytes, (+)-PTZ increased secreted BDNF and proBDNF levels.
Conclusions:
- S1R plays a significant role in regulating BDNF levels in the retina and ONH.
- S1R agonists may offer therapeutic benefits for glaucoma by enhancing endogenous BDNF production.
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