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Published on: September 19, 2025
GABAergic retinal ganglion cells regulate innate defensive responses
Danrui Cai1, Xue Luo1,2, Kejiong Shen1
1Eye Center, Renmin Hospital of Wuhan University, Wuhan University, Wuhan, Hubei.
Specific retinal ganglion cells (RGCs) using gamma-aminobutyric acid (GABA) control defensive responses. Ablating these cells reduced threat detection without impacting vision, revealing their role in visual defense circuits.
Area of Science:
- Neuroscience
- Retinal Biology
- Neurotransmission
Background:
- Gamma-aminobutyric acid (GABA) is the primary inhibitory neurotransmitter in the central nervous system, including the retina.
- The specific functions of GABA-immunolabeled retinal ganglion cells (RGCs) remain largely unexplored.
Purpose of the Study:
- To investigate the role of GABAergic RGCs in visual processing and behavioral responses.
- To determine the specific contribution of superior colliculus-projecting GABAergic RGCs to defensive behaviors.
Main Methods:
- Identified and characterized GABAergic RGCs projecting to the superior colliculus in mice.
- Utilized selective ablation techniques to remove these specific RGCs.
- Assessed behavioral responses to looming stimuli and image-forming visual functions.
- Measured glucose metabolism in the superior colliculus using [18F]-fluorodeoxyglucose positron emission tomography (FDG PET).
Main Results:
- Selective ablation of superior colliculus-projecting GABAergic RGCs reduced looming stimulus-induced defensive responses.
- Image-forming visual functions remained unaffected by the ablation.
- Significant enhancement of glucose metabolism was observed in the superior colliculus post-ablation.
Conclusions:
- Superior colliculus-projecting GABAergic RGCs play a critical role in controlling visually-evoked defensive behaviors.
- These RGCs regulate superior colliculus neuronal activity, influencing threat detection.
- GABAergic RGCs modulate defensive responses independently of image-forming vision.
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