Htr1b is necessary for normal retinal function in mice

Area of Science:

• Neuroscience
• Ophthalmology
• Molecular Biology

Background:

• Serotonin (5-HT) plays a role in retinal development and function.
• The specific roles of individual 5-HT receptors in the retina are not well understood.

Purpose of the Study:

• To investigate the role of serotonin receptor 1B (Htr1b) in retinal function and visual processing.
• To characterize the contribution of Htr1b to serotonergic signaling in the retina.

Main Methods:

• RNA sequencing and in situ labeling for Htr1b localization.
• Histology and SD-OCT for retinal structure assessment.
• Optomotor tests for visual function.
• In vivo ERG and ex vivo MEA recordings for retinal function analysis.

Main Results:

• Htr1b is localized to the inner retina and RGCs.
• Htr1b knockout mice show deficits in contrast sensitivity and visual acuity.
• ERG and MEA recordings reveal altered RGC function, including latency delays, reduced sensitivity, and abnormal firing patterns.

Conclusions:

• Htr1b is essential for normal retinal serotonergic signaling.
• Htr1b regulates RGC excitability and visual sensitivity.
• Targeting Htr1b may offer therapeutic potential for visual disorders.